Electric spindle cooling system and milling machine

Abstract

The utility model discloses an electric spindle cooling system and a milling machine, which belong to the technical field of electric spindle cooling and comprise a stator, a first end cover and a second end cover, wherein the stator is connected with the first end cover and the second end cover to form a closed space; the motor further comprises a rotor arranged in the closed space, a first cooling flow channel penetrating through the first end cover and a second cooling flow channel penetrating through the second end cover. The cooling device comprises a first cooling flow channel, a second cooling flow channel connected with the first cooling flow channel, a first circulating flow channel connected with the first cooling flow channel, a second circulating flow channel connected with the second cooling flow channel, a recovery pool connected with the second circulating flow channel, and a cooling device connected with the recovery pool, and the cooling device is further connected with the first circulating flow channel. The technical problem that the circulating cooling effect of the motorized spindle is poor is solved, the machining precision and stability of the motorized spindle are improved, and the technical effect of fully cooling the motorized spindle is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric main shaft cooling technical field, concretely relates to a kind of electric main shaft cooling system and milling machine. BACKGROUND

[0002] In modern mechanical manufacturing process, the error caused by thermal deformation reaches 50%, especially in high-speed high-precision machining, the proportion is higher 60%~80%. As the key component of high-speed high-precision numerical control machine tool, the performance of electric spindle directly affects the machining accuracy of machine tool. Since the electric spindle motor is built-in and the shell is closed, the heat generated by motor power loss and the heat generated by front and rear bearing friction cannot be effectively discharged in time, and a large amount of heat accumulates in the shaft core rotor, causing the shaft core bearing rotor to expand due to heat, resulting in serious thermal deformation, changing the original clearance between parts, and the error is added to the machining center point (TCP), which ultimately reduces the machining accuracy of electric spindle.

[0003] Traditional electric spindle usually uses cooling liquid (water or oil) to circulate cooling for motor stator and electric spindle shell. However, the traditional cooling system has poor cooling effect, which easily affects the machining accuracy and stability of electric spindle. SUMMARY

[0004] To solve the above problems, the utility model provides an electric spindle cooling system in the first aspect, comprising: a stator, a first end cover and a second end cover connected to the stator respectively;

[0005] Wherein, the stator is connected to the first end cover and the second end cover to form a closed space;

[0006] It also includes a rotor arranged in the closed space, a first cooling flow channel penetrating through the first end cover, and a second cooling flow channel penetrating through the second end cover;

[0007] A first circulating flow channel connected to the first cooling flow channel, a second circulating flow channel connected to the second cooling flow channel, and a cooling device connected to the first and second circulating flow channels.

[0008] In some embodiments, the first cooling flow channel includes a first cooling sub-flow channel and a second cooling sub-flow channel connected to the first cooling sub-flow channel;

[0009] Wherein, the first cooling sub-flow channel is arranged through the first end cover to introduce the external cooling liquid into the closed space; the second cooling sub-flow channel is annular structure, and the bottom is provided with a through hole.

[0010] In some embodiments, the first end cover includes a first sealing ring, and a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor.

[0011] In some embodiments, the second end cover comprises a second sealing ring and a third sealing ring, the third sealing ring is sleeved on the rotor, and the second sealing ring is matched with the third sealing ring.

[0012] In some embodiments, a top of the second sealing ring is provided with a first annular structure, and a bottom of the third sealing ring is provided with a second annular structure, the second annular structure is sleeved on an outer periphery of the first annular structure.

[0013] In some embodiments, the electrospindle cooling system further comprises a third end cover connected with the stator.

[0014] The third end cover is provided with a containing groove and a third cooling flow channel connected with the containing groove.

[0015] The third end cover is further provided with a second sealing ring at a connection position with the second end cover.

[0016] In some embodiments, the second circulating flow channel is connected with the third cooling flow channel, used for receiving the cooled coolant discharged from the third cooling flow channel and guiding the coolant into the cooling device.

[0017] In some embodiments, the cooling device is provided with a pumping device connected with the first circulating flow channel.

[0018] By adopting the above technical scheme, the utility model mainly has the following technical effects:

[0019] The utility model discloses a first cooling flow channel is set up to guide the coolant into the electrospindle cooling system, a second cooling flow channel is set up to discharge the coolant, and the cooled coolant is guided into the recovery pool and the cooling device through the second circulating flow channel, and finally the cooled coolant is pumped into the first circulating flow channel and the first cooling flow channel through the cooling device, and the opening of the flow regulating valve in the recovery pool is adjusted, so that the technical problem of poor electrospindle circulating cooling effect is solved, the machining precision and stability of the electrospindle are improved, and the technical effect of fully cooling the electrospindle is achieved. DRAWINGS

[0020] Figure 1 It is a cooling schematic view of the utility model of an electrospindle cooling system.

[0021] Figure 2 It is a (part) cooling schematic view of the utility model of an electrospindle cooling system.

[0022] Figure 3 It is a cooling schematic view of the utility model of an electrospindle cooling system. Figure 2 It is an enlarged view of part A.

[0023] Figure 4 Fig. 2 is a schematic view of the cooling device of the present application; Figure 2 Fig. 3 is an enlarged view of part B in Fig. 2;

[0024] Figure 5 Fig. 4 is an enlarged view of part C in Fig. 2; Figure 4 Fig. 5 is an enlarged view of part D in Fig. 2.

[0025] In the drawings, the following reference signs are used:

[0026] 1. stator;

[0027] 2. first end cover; 21. first sealing ring; 22. first sealing ring;

[0028] 3. second end cover; 31. second sealing ring; 311. first annular structure; 32. third sealing ring; 321. second annular structure;

[0029] 4. rotor; 41. rotating shaft; 42. fixed groove;

[0030] 5. first cooling flow channel; 51. first cooling sub-flow channel; 52. second cooling sub-flow channel;

[0031] 6. second cooling flow channel;

[0032] 7. third end cover; 71. accommodating groove; 72. third cooling flow channel; 73. second sealing ring;

[0033] 8. first circulation flow channel;

[0034] 9. second circulation flow channel;

[0035] 10. recovery pool;

[0036] 11. cooling device; 111. flow valve. DETAILED DESCRIPTION

[0037] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings of the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the present application.

[0038] Reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a particular embodiment logically divided into parts. It is explicitly contemplated that embodiments described herein can be combined to include other embodiments.

[0039] Referring to Figures 1-5 The utility model discloses a first aspect provides a kind of electric spindle cooling system, comprising: stator 1, first end cap 2 and second end cap 3 are connected with the top and bottom of the stator 1 respectively;Wherein, the stator 1 is connected with the first end cap 2 of top and the second end cap 3 of bottom and then constitutes closed space;The electric spindle cooling system further includes rotor 4 in the closed space, first cooling flow channel 5 being set through the first end cap 2, second cooling flow channel 6 being set through the second end cap 3, first circulation flow channel 8 being connected with the first cooling flow channel 5, second circulation flow channel 9 being connected with the second cooling flow channel 6, recovery pool 10 being connected with the second circulation flow channel 9, and cooling device 11 being connected with the recovery pool 10, and the cooling device 11 is also connected with first circulation flow channel 8.

[0040] Further, the stator 1 is connected with the first end cap 2 and the second end cap 3 to form a sealed space, which can effectively prevent foreign matter from entering the interior of the electric spindle cooling system, and also can prevent mechanical collision from damaging the internal structure of the electric spindle cooling system, thereby playing a good protection role. The stator 1 is a stationary fixed part in the electric spindle cooling system, which can generate a rotating magnetic field after current is passed; the rotor 4 is a rotating part of the electric spindle cooling system, which can obtain an electromagnetic torque to rotate under the action of the rotating magnetic field generated by the stator 1 based on the electromagnetic induction phenomenon.

[0041] Further, the rotor 4 is connected with the first end cap 2 and the second end cap 3 through bearings, so as to fix the rotor 4 by the first end cap 2 and the second end cap 3. In some embodiments, a stepped fixing groove 42 is provided on the rotating shaft 41 of the rotor 4, and the rotating shaft 41 is connected with the bearing through the fixing groove 42, so as to avoid displacement of the bearing along the rotating shaft 41 when the electric spindle cooling system is working. In addition, a circular through hole is provided in the center of each of the first end cap 2 and the second end cap 3, so that the rotor 4 can extend out of the closed space through the circular through hole and be connected with other transmission components or parts.

[0042] In some embodiments, the output end of the rotor 4 can be connected with a load such as a milling machine. By directly connecting the rotor 4 with the load, compared with connecting the milling machine with the motor through a gear box, the power loss caused by the gear box can be reduced. The exemplary power loss can be the energy lost by the gear box during transmission due to internal friction, rotation and vibration, etc. These energies are dissipated in the form of heat, thereby causing the mechanical efficiency to decrease.

[0043] Further, the first cooling flow channel 5 is arranged through the first end cover 2. In some embodiments, the first cooling flow channel 5 is used to introduce cooling liquid into the closed space, and the cooling liquid absorbs the heat on the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4, reducing the temperature inside the motorized spindle, and avoiding the influence of the machining precision of the motorized spindle caused by the thermal deformation of the stator 1 and / or the rotor 4 due to the high temperature. On the other hand, by improving the machining precision and stability of the rotor 4 during operation, the machining precision and stability of the motorized spindle can be improved. Exemplarily, the cooling liquid can be cooling oil, which has the characteristics of local non-magnetic, non-flammable, non-conductive and good heat conduction. Using cooling oil as the cooling liquid has no influence on the magnetic circuit of the motorized spindle cooling system, and the heat dissipation efficiency is higher.

[0044] In some embodiments, the first cooling flow channel 5 includes a first cooling sub-flow channel 51 and a second cooling sub-flow channel 52 connected with the first cooling sub-flow channel 51. The first cooling sub-flow channel 51 is arranged through the first end cover 2 and is used to introduce external cooling liquid into the closed space. The second cooling sub-flow channel 52 has an annular structure and is provided with a through hole at the bottom. The cooling liquid entering the first cooling flow channel 5 first enters the second cooling sub-flow channel 52 through the first cooling sub-flow channel 51, and then is dispersed into the closed space through the through hole in the second cooling sub-flow channel 52 to contact the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4 in the closed space.

[0045] Further, the second cooling flow channel 6 is arranged through the second end cover 3. In some embodiments, the second cooling flow channel 6 is used to guide the cooling liquid after cooling the stator 1 and / or the rotor 4 in the closed space out, thereby realizing the circulation cooling process of the cooling liquid.

[0046] In some embodiments, the first end cover 2 further includes a first sealing ring 21 connected with the first end cover 2. The first sealing ring 21 is further provided with a first sealing ring 22, and the first sealing ring 21 and the first sealing ring 22 are arranged on the rotor 4 to enhance the sealing performance of the connection between the first end cover 2 and the rotor 4.

[0047] In some embodiments, the second end cover 3 further comprises a second sealing ring 31 connected to the second end cover 3, and a third sealing ring 32 sleeved on the rotor 4, the second sealing ring 31 and the third sealing ring 32 are matched to enhance the sealing performance of the connection between the second end cover 3 and the rotor 4.

[0048] In some more preferred embodiments, the top of the second sealing ring 31 is provided with a first annular structure 311, and the bottom of the third sealing ring 32 is provided with a second annular structure 321, the second annular structure 321 is sleeved on the outer periphery of the first annular structure 311; by designing the second annular structure 321 to be sleeved on the first annular structure 311, when the electrospindle cooling system is working, the cooling liquid will move downward along the second annular structure 321, thereby avoiding the cooling liquid entering the connection between the second end cover 3 and the rotor 4, and further enhancing the sealing performance of the connection between the second end cover 3 and the rotor 4.

[0049] Further, the electrospindle cooling system further comprises a third end cover 7 connected to the stator 1, in some embodiments, the third end cover 7 is provided with an annular accommodating groove 71, and a third cooling flow channel 72 connected to the outside of the accommodating groove 71; wherein the accommodating groove 71 is arranged below the second cooling flow channel 6 to receive the cooled cooling liquid discharged from the second cooling flow channel 6; it should be noted that the cooled cooling liquid refers to the cooling liquid after cooling the stator 1 and / or the rotor 4, and the third cooling flow channel 72 is used to guide the cooled cooling liquid in the accommodating groove 71 to the outside structure of the electrospindle cooling system.

[0050] In some more preferred embodiments, the connection between the third end cover 7 and the second end cover 3 is further provided with a second sealing ring 73 to enhance the sealing performance of the connection between the third end cover 7 and the second end cover 3.

[0051] Further, the second circulating flow channel 9 is connected to the third cooling flow channel 72 to receive the cooled cooling liquid discharged from the third cooling flow channel 72 and guide it into the recovery pool 10; it should be noted that in this embodiment, the cooled cooling liquid refers to the cooling liquid after cooling the stator 1 and / or the rotor 4.

[0052] Further, the recovery pool 10 is a long rectangular hollow container without a cover, and the recovery pool 10 is arranged directly below the second circulating flow channel 9 to receive the cooled cooling liquid discharged from the second circulating flow channel 9.

[0053] In some embodiments, the cooling device 11 is connected with the recovery tank 10 for receiving the cooling liquid from the recovery tank 10 and cooling the cooling liquid, and the cooling of the cooling liquid can be but not limited to using a compressor to cool the cooling liquid or using a fan and a radiator to cool the cooling liquid; the cooling device 11 is also connected with the first circulating flow channel 8, and the cooling liquid is injected into the first circulating flow channel 8 after being cooled, so that the resources can be reasonably and effectively utilized and the production cost can be reduced.

[0054] In some embodiments, the cooling device 11 is connected with the first circulating flow channel 8, and the flow valve 111 is arranged at the connection position of the cooling device 11 and the first circulating flow channel 8; in some embodiments, the operator can analyze the cooled cooling liquid in the recovery tank 10, adjust the opening degree of the flow valve 111 according to the analysis result, adjust the flow of the cooling liquid in the first cooling flow channel 5 connected with the first circulating flow channel 8, and thus improve the cooling effect of the cooling liquid and improve the machining precision.

[0055] In some embodiments, the recovery tank 10 is provided with a temperature sensor for acquiring the temperature of the cooled cooling liquid in the recovery tank 10; after the temperature of the cooled cooling liquid is acquired, the operator can adjust the opening degree of the flow valve 111, adjust the flow of the cooling liquid in the first cooling flow channel 5, and improve the cooling effect of the cooling liquid.

[0056] The second aspect of the utility model provides a milling machine, including above-mentioned scheme one kind of electric main shaft cooling system.

[0057] Finally, it should be noted that: the utility model embodiment disclosed is only the preferable embodiment of the utility model, and is only used for explaining the technical scheme of the utility model, and is not limited to it; although the utility model is explained in detail with reference to the foregoing embodiments, those skilled in the art should understand that; it still can modify the technical scheme recorded in the foregoing each item embodiment, or make equivalent replacement to part of technical features; and these modifications or replacements do not make the essence of corresponding technical scheme deviate from the spirit and scope of the utility model each item embodiment technical scheme.

Claims

1. An electric spindle cooling system, characterized in that: include: a stator, a first end cover and a second end cover respectively connected to the stator; Wherein, the stator is connected with the first end cover and the second end cover to form a closed space; Also included is a rotor disposed in the enclosed space, a first cooling channel disposed through the first end cover, and a second cooling channel disposed through the second end cover; A first circulation channel connected to the first cooling channel, a second circulation channel connected to the second cooling channel, a recovery pool connected to the second circulation channel, and a cooling device connected to the recovery pool, wherein the cooling device is also connected to the first circulation channel.

2. The electric spindle cooling system according to claim 1, characterized in that: A flow valve is also provided at the connection between the cooling device and the first circulation channel.

3. The electric spindle cooling system according to claim 1, characterized in that: A temperature sensor is provided in the recovery pool, and the temperature sensor is used to obtain the temperature of the cooling liquid in the recovery pool after cooling.

4. The electric spindle cooling system according to claim 1, characterized in that: The first cooling channel includes: a first cooling sub-channel, and a second cooling sub-channel connected to the first cooling sub-channel; The first cooling sub-channel is arranged to pass through the first end cover and is used to introduce external cooling liquid into the closed space; the second cooling sub-channel is an annular structure, and a through hole is provided at the bottom thereof.

5. The electric spindle cooling system according to claim 1, characterized in that: The first end cover includes: a first sealing ring, a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor.

6. The electric spindle cooling system according to claim 5, characterized in that: The second end cover includes: a second sealing ring and a third sealing ring. The third sealing ring is sleeved on the rotor. The second sealing ring is adapted to the third sealing ring.

7. The electric spindle cooling system according to claim 6, characterized in that: A first annular structure is provided on the top of the second sealing ring, and a second annular structure is provided on the bottom of the third sealing ring. The second annular structure is sleeved on the outer circumference of the first annular structure.

8. The electric spindle cooling system according to claim 7, characterized in that: Also includes: a third end cover connected to the stator, The third end cover is provided with a receiving groove and a third cooling channel connected to the receiving groove; A second sealing ring is further provided at the connection between the third end cover and the second end cover.

9. A milling machine, characterized in that: An electric spindle cooling system comprising any one of claims 1-8.

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