High-speed direct-drive rotary table

Abstract

The utility model discloses a high-speed direct-drive rotary table. The high-speed direct-drive rotary table comprises a main shaft piece and a rotary table body. The main shaft piece comprises a shell and a rotating shaft rotationally arranged in the shell. The rotary table is located above the shell and connected with the rotary shaft. A gap is formed between the shell and the rotary table, an air supply hole communicated with the gap is formed in the shell, and the air supply hole is used for providing air flow for the gap so as to form an air curtain between the shell and the rotary table. According to the high-speed direct-drive rotary table, the failure rate can be reduced, and the production efficiency is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a machine tool component technical field, concretely relates to a high -speed direct drive rotary table. BACKGROUND

[0002] The existing high -speed direct drive rotary table is generally used for drilling and tapping machine tool, needs to be used to turn when, since workpiece needs to rotate with the rotary table high speed, needs to promote the rotary table rotating speed to 2000 per minute to satisfy the processing requirement. It is found in practice that the failure rate of the above-mentioned rotary table main shaft increases under high -speed environment, and the maintenance frequency increases, which reduces the production efficiency and increases the production cost. SUMMARY

[0003] The utility model discloses at least one of the technical problems in prior art. To this end, the utility model provides a high -speed direct drive rotary table, reduces the failure rate under high -speed environment of itself.

[0004] The utility model discloses a high -speed direct drive rotary table, the high -speed direct drive rotary table includes:

[0005] Main shaft piece, including the casing and rotatable be located in the rotating shaft of casing in;And

[0006] Rotary table, be located above the casing, and connect rotating shaft;

[0007] The casing with the rotary table has a gap, and the casing is provided with a gas supply hole communicating with the gap, and the gas supply hole is used to provide airflow to the gap to form an air curtain between the casing and the rotary table.

[0008] According to some embodiments of the utility model, among the two surfaces opposite to the casing and the rotary table, one forms a recessed annular groove coaxially surrounding the rotating shaft, and the other forms a protruding annular protrusion, the gas supply hole is located on the inner side of the annular groove or the annular protrusion, and the annular protrusion and the annular groove gap fit.

[0009] According to some embodiments of the utility model, the casing has coaxially arranged annular groove and annular protrusion, the rotary table has annular protrusion matched with the annular groove of the casing, and annular groove matched with the annular protrusion of the casing.

[0010] According to some embodiments of the utility model, the surface opposite to the casing and the rotary table is provided with an annular air passage disc, and the air passage disc has a gas guide channel and an air inlet and an air outlet communicating with the gas guide channel.

[0011] The air inlet and the gas supply hole are communicated, the air outlet is multiple, and the gap is arranged around the rotating shaft.

[0012] According to some embodiments of the present invention, the surface of the housing facing the turntable is recessed to form an annular mounting groove, the vent plate is disposed in the annular mounting groove, and the air outlet is vented towards the turntable.

[0013] According to some embodiments of the present invention, the turntable includes a turntable and a retaining ring, the retaining ring being sealed to the turntable and protruding from the side of the turntable facing the housing;

[0014] There is a first gap between the turntable and the end face of the housing, and there is a second gap between the retaining ring and the outer peripheral surface of the housing. The first gap and the second gap together constitute the gap.

[0015] According to some embodiments of this utility model, the turntable and the retaining ring are integrally formed.

[0016] According to some embodiments of the present invention, a recessed stepped surface is formed at the junction of the side of the turntable facing the housing and the outer peripheral surface, and the retaining ring is fastened to the stepped surface.

[0017] According to some embodiments of the present invention, the housing includes a main housing and an upper end cover disposed on the upper end of the main housing;

[0018] The high-speed direct-drive turntable includes an intake valve, which is disposed on the main housing. A first flow channel communicating with the intake valve is formed inside the main housing, and a second flow channel communicating with the first flow channel is formed inside the upper end cover. The air supply port is connected to the second flow channel.

[0019] According to some embodiments of the present invention, the high-speed direct-drive turntable includes a brake pad, which is located inside the housing and fixed to the rotating shaft;

[0020] The housing has a mounting cavity and an abutment portion, which are located on opposite sides of the brake pad. A piston is provided in the mounting cavity, which can extend to engage with the abutment portion to clamp the brake pad, or retract to release the clamping.

[0021] According to some embodiments of the present invention, the high-speed direct-drive turntable includes a stator and a rotor. The stator is fixed inside the housing, and the rotor is fixed to the rotating shaft. The rotor cooperates with the stator to drive the rotating shaft to rotate.

[0022] The high-speed direct drive rotary table has at least the following beneficial effects: the air supply hole is arranged on the shell, air flow is provided to the gap between the shell and the rotary table through the air supply hole, an air curtain is formed between the shell and the rotary table, the cutting fluid and the atomized liquid are hindered from entering the gap between the rotary table and the shell, the problem that the cutting fluid and the atomized liquid enter the shell under a high-speed environment is greatly reduced, the failure rate is reduced, and the production efficiency is effectively guaranteed.

[0023] Additional aspects and advantages of the present application will be described in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0025] Figure 1 is a sectional view of the high-speed direct drive rotary table of an embodiment of the present application;

[0026] Figure 2 is Figure 1 a partial A enlarged schematic view;

[0027] Figure 3 is Figure 1 a partial B enlarged schematic view;

[0028] Figure 4 is a top view of the spindle and the air passage disc of the high-speed direct drive rotary table of an embodiment of the present application;

[0029] Figure 5 is Figure 4 a front view.

[0030] REFERENCE NUMERALS:

[0031] 10, spindle; 11, shell; 10a, gap; 10b, first gap; 10c, second gap; 111, main shell; 112, upper end cover; 113, abutting portion; 12, rotating shaft;

[0032] 20, rotary table; 21a, annular groove; 21b, annular protrusion; 22, rotating disc; 23, retaining ring; 22a, step surface;

[0033] 30, air passage disc; 30a, air outlet;

[0034] 40, air inlet valve;

[0035] 50, brake pad;

[0036] 60, piston;

[0037] 70, stator;

[0038] 80. The rotor. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and are not to be construed as limiting the present application.

[0040] In the description of the present application, it is to be understood that, if the orientation description, such as the upper, lower, front, rear, left, right and the like, the orientation or position relationship shown in the drawings is based on the orientation or position relationship, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application.

[0041] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If the first, second is described, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features or the order of the indicated technical features.

[0042] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0043] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The existing high-speed direct drive rotary table is generally used for drilling and tapping machine tools. When turning is needed, the rotary table speed needs to be increased to 2000 rpm to meet the machining requirements. In practice, it is found that the failure rate of the above-mentioned rotary table spindle increases under high-speed environment, and the maintenance frequency increases, which reduces the production efficiency and increases the production cost. Through research, it is found that due to the increase of the rotary table speed, the existing spindle sealing structure cannot meet the use requirements, the service life is shortened, and then the oil stain or chip liquid enters the inside of the spindle during the machining process, causing damage to the spindle. And under high-speed environment, it is more likely to produce splashing mist liquid, which further aggravates the problem of damage to the spindle.

[0045] For this purpose, please refer to Figures 1-5 The embodiment of the present application provides a high-speed direct drive rotary table, which comprises a spindle 10 and a rotary table 20. The rotary table 20 is used to carry the workpiece to be machined, and the spindle 10 is used to drive the rotary table 20 and the workpiece to be machined to rotate.

[0046] Please refer to Figures 1-3 The spindle 10 comprises a shell 11 and a rotating shaft 12 rotatably arranged in the shell 11. The shell 11 forms a mounting cavity, and the rotating shaft 12 is rotatably mounted in the mounting cavity. The rotary table 20 is located above the shell 11 and is connected to the rotating shaft 12, so that the rotary table 20 rotates with the rotating shaft 12.

[0047] The shell 11 and the rotary table 20 have a gap 10a. In the rotating state, the rotary table 20 does not contact the shell 11.

[0048] The shell 11 is provided with a gas supply hole communicating with the gap 10a, and the gas supply hole is used to provide gas flow to the gap 10a to form an air curtain between the shell 11 and the rotary table 20. That is, the above-mentioned gas flow makes it impossible for cutting fluid and atomized liquid to enter the gap 10a between the rotary table 20 and the shell 11, thereby realizing the sealing between the rotary table 20 and the shell 11.

[0049] It can be understood that the rotating shaft 12 and the shell 11 have relative motion, and generally bearings are arranged at the connection positions of the two, and cutting fluid and atomized liquid are easy to enter from the connection positions of the two, thereby causing damage to the spindle 10.

[0050] By arranging the gas supply hole on the shell 11, the gas supply hole provides gas flow to the gap 10a between the shell 11 and the rotary table 20 to form an air curtain between the shell 11 and the rotary table 20, thereby preventing cutting fluid and atomized liquid from entering the gap 10a between the rotary table 20 and the shell 11, and greatly reducing the problem of cutting fluid and atomized liquid entering the shell 11 under high-speed environment, thereby reducing the failure rate and effectively guaranteeing the production efficiency.

[0051] It can be understood that in order to connect the turntable 20, an opening is formed on the surface of the shell 11, and the rotating shaft 12 extends out of the opening, and the turntable 20 is connected to the part of the rotating shaft 12 extending out of the opening.

[0052] In order to further improve the sealing effect and reduce the probability of cutting fluid and atomized liquid entering the shell 11, in some embodiments, one of the two surfaces of the shell 11 opposite to the turntable 20 forms an annular groove 21a coaxially surrounding the rotating shaft 12, and the other forms a protruding annular protrusion 21b. The gas supply hole is located inside the annular groove 21a or the annular protrusion 21b. That is, the gas supply hole is located in the area surrounded by the annular groove 21a, or the gas supply hole is located in the area surrounded by the annular protrusion 21b. The annular protrusion 21b is in clearance fit with the annular groove 21a.

[0053] It can be understood that the annular groove 21a can be provided on the shell 11, and the annular protrusion 21b is correspondingly provided on the turntable 20; or the annular protrusion 21b can be provided on the shell 11, and the annular groove 21a is provided on the turntable 20.

[0054] The annular protrusion 21b and the annular groove 21a are in mutual fit. The annular groove 21a is coaxially arranged around the rotating shaft 12, and the corresponding annular protrusion 21b is also coaxially arranged around the rotating shaft 12, that is, the annular protrusion 21b and the annular groove 21a are coaxially arranged. The annular groove 21a or the annular protrusion 21b can be a circular ring structure. When the turntable 20 rotates relative to the shell 11, the two maintain stability.

[0055] It can be understood that the gas flow in the gas supply hole flows into the gap 10a and out of the gap between the annular protrusion 21b and the annular groove 21a. The above-mentioned gap can play the role of uniform gas flow. Specifically, the gas flow out of the gas supply hole needs to flow radially, and also needs to flow circumferentially. The gap between the annular protrusion 21b and the annular groove 21a is in a up-and-down undulating shape, and the gas flow at the turning point is easy to collide and disperse, improving the uniformity of the circumferential direction. In addition, the structure of the clearance fit between the annular protrusion 21b and the annular groove 21a can further prolong the overall length of the gap between the shell 11 and the turntable 20, increase the difficulty of the cutting fluid and the atomized liquid to pass through, and improve the sealing performance.

[0056] It can be understood that the annular groove 21a and the annular protrusion 21b matched with each other can be provided in multiple groups. In order to further improve the sealing performance and the uniformity of gas diffusion.

[0057] In some embodiments, among the two surfaces of the shell 11 opposite to the turntable 20, one of the two forms a plurality of annular grooves 21a coaxially surrounding, and the other forms a plurality of corresponding annular protrusions 21b.

[0058] In some embodiments, the shell 11 has a ring-shaped recess 21a and a ring-shaped protrusion 21b arranged coaxially, the turntable 20 has a ring-shaped protrusion 21b matched with the ring-shaped recess 21a of the shell 11, and a ring-shaped recess 21a matched with the ring-shaped protrusion 21b of the shell 11.

[0059] Please refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, the surface of the shell 11 opposite to the turntable 20 is provided with a ring-shaped air supply disc 30, the air supply disc 30 has a gas guide channel and an air inlet and an air outlet 30a connected with the gas guide channel. The air inlet is connected with the air supply hole, and the air outlet 30a is in a plurality of numbers and is arranged at intervals around the rotating shaft 12.

[0060] The air supply disc 30 is a ring-shaped disc body, the gas flow from the air supply hole enters the gas guide channel through the air inlet, flows in the gas guide channel, and flows out through the air outlet 30a. The air outlet 30a is in a plurality of numbers and is arranged at intervals around the rotating shaft 12, so that the gas flow can be distributed more uniformly in the circumferential direction.

[0061] It should be noted that the number of air supply holes can be one or more. When the number of air supply holes increases, it is difficult to form in the wall of the shell 11. When the number of air supply holes is too small, the diffusion effect of the gas flow in the circumferential direction will be affected, that is, the integrity of the air curtain will be affected.

[0062] By arranging the air supply disc 30, the air supply disc 30 is used to realize the more uniform air flow in the circumferential direction, and the difficulty and cost are relatively lower.

[0063] In some embodiments, the surface of the shell 11 facing the turntable 20 is recessed to form a ring-shaped mounting groove, and the air supply disc 30 is arranged in the ring-shaped mounting groove, and the air supply disc 30 can be tightly mounted in the ring-shaped mounting groove.

[0064] The air outlet direction of the air outlet 30a is towards the turntable 20. That is, the gas flow from the air outlet 30a of the air supply disc 30 will first impact on the surface of the turntable 20. The above collision realizes the acceleration of the circumferential diffusion.

[0065] The air outlet 30a is arranged on the upper surface of the air supply disc 30, that is, the surface of the air supply disc 30 facing the turntable 20. It should be noted that there is a space between the upper surface of the air supply disc 30 and the turntable 20 for the gas flow to flow out.

[0066] In some embodiments, the turntable 20 includes a turntable 22 and a blocking ring 23, the blocking ring 23 is sealingly connected to the turntable 22 and protrudes from the turntable 22 towards the shell 11. In Figure 1The blocking ring 23 protrudes from the lower surface of the rotary disc 22. The rotary disc 22 is a main component of the rotary table 20, and the upper surface of the rotary disc 22 constitutes a support surface of the rotary table 20 to support a workpiece to be machined.

[0067] The rotary disc 22 and the end surface of the housing 11 have a first gap 10b, and the blocking ring 23 and the outer peripheral surface of the housing 11 have a second gap 10c. The first gap 10b and the second gap 10c jointly constitute a gap 10a.

[0068] It can be understood that the process of the gas flowing out of the gap 10a is the process of the gas flowing through the first gap 10b and the second gap 10c in sequence. The second gap 10c is located between the blocking ring 23 and the outer peripheral surface of the housing 11, which makes the gas flow downward along the outer peripheral surface of the housing 11 when passing through the second gap 10c. This makes the cutting fluid or the mist liquid need to overcome the gravity to enter the second gap 10c. That is, the sealing performance of the gap 10a is further improved.

[0069] In some embodiments, the rotary disc 22 and the blocking ring 23 are integrally formed. In this way, the assembly difficulty is reduced.

[0070] In some embodiments, a recessed step surface 22a is formed at the junction between the one surface of the rotary disc 22 facing the housing 11 and the outer peripheral surface, and the blocking ring 23 is fastened to the step surface 22a. It can be understood that the blocking ring 23 is fastened to the step surface 22a, that is, the blocking ring 23 can be detached. The fastening manner of the blocking ring 23 can be that a plurality of screws are arranged along the circumference of the blocking ring 23, and the blocking ring 23 is fixed on the step surface 22a by the screws.

[0071] In the axial direction, the recessed step surface 22a is arranged in a staggered manner with the gap 10a between the housing 11 and the rotary table 20, so as to improve the sealing performance.

[0072] In some embodiments, the housing 11 includes a main housing 111 and an upper end cover 112 arranged at the upper end of the main housing 111. The main housing 111 and the upper end cover 112 can be fastened and connected. The upper end cover 112 is used to rotate with the rotary shaft 12 and limit the position of the rotary shaft 12 in the axial direction.

[0073] The high-speed direct-drive rotary table includes an air inlet valve 40 arranged on the main housing 111, a first flow channel formed in the main housing 111 and communicating with the air inlet valve 40, a second flow channel formed in the upper end cover 112 and communicating with the first flow channel, and a gas supply hole communicating with the second flow channel. The air inlet valve 40 is connected with an air source, and the gas flows into the first flow channel and the second flow channel through the air inlet valve 40 and flows out from the gas supply hole.

[0074] In some embodiments, the high-speed direct-drive rotary table comprises a brake pad 50, which is located in the housing 11 and fixed to the rotating shaft 12. The housing 11 has a mounting sub-cavity and an abutting portion 113 located on opposite sides of the brake pad 50, and the mounting sub-cavity is provided with a piston 60 which can be extended to clamp the brake pad 50 in cooperation with the abutting portion 113, or retracted to release the clamping. In this way, the emergency stop control of the rotating shaft 12 is realized.

[0075] In some embodiments, the high-speed direct-drive rotary table comprises a stator 70 and a rotor 80, the stator 70 is fixed in the housing 11, and the rotor 80 is fixed to the rotating shaft 12, the rotor 80 is located in the stator 70, and the rotor 80 cooperates with the stator 70 to rotate the rotor 80 and the rotating shaft 12 together. By integrating the stator 70 and the rotor 80 in the high-speed direct-drive rotary table, the direct drive of the rotating shaft 12 is realized, and the overall structure is compact and occupies small space.

[0076] In some embodiments, the housing 11 comprises a lower end cover arranged at the lower end of the main housing 111. The lower end cover is used to seal the lower end of the main housing. The lower end cover cooperates with the upper end cover 112 to limit the axial position of the rotating shaft 12.

[0077] In some embodiments, the lower end of the rotating shaft 12 is provided with an encoder to realize precise positioning feedback.

[0078] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A high-speed direct-drive rotary table, characterized by, The high-speed direct-drive rotary table comprises: a main shaft, comprising a shell and a rotating shaft rotatably arranged in the shell; and a rotary table located above the shell and connected to the rotating shaft; a gap between the shell and the rotary table, a gas supply hole is arranged on the shell and communicates with the gap, the gas supply hole is used to provide gas flow to the gap to form an air curtain between the shell and the rotary table; the rotary table comprises a rotating disc and a retaining ring, the retaining ring is sealingly connected to the rotating disc and protrudes from one side of the rotating disc towards the shell; the rotating disc and the end surface of the shell have a first gap, the retaining ring and the outer peripheral surface of the shell have a second gap, and the first gap and the second gap jointly form the gap.

2. The high-speed direct drive rotary table of claim 1, wherein, Among the two surfaces of the shell and the rotary table opposite to each other, one forms a recessed annular groove coaxially surrounding the rotating shaft, and the other forms a protruding annular protrusion, the annular protrusion and the annular groove are in gap cooperation, and the gas supply hole is located on the inner side of the annular groove or the annular protrusion.

3. The high-speed direct drive rotary table of claim 2, wherein, The shell has coaxially arranged annular groove and annular protrusion, the rotary table has annular protrusion matched with the annular groove of the shell, and annular groove matched with the annular protrusion of the shell.

4. The high-speed direct drive rotary table of claim 1, wherein, A ring-shaped air passage disc is arranged on the surface of the shell opposite to the rotary table, the air passage disc has a gas guide channel and an air inlet and an air outlet communicating with the gas guide channel; the air inlet communicates with the gas supply hole; the air outlet is in a plurality of gaps surrounding the rotating shaft.

5. The high-speed direct drive rotary table of claim 4, wherein, The surface of the shell towards the rotary table is recessed to form an annular mounting groove, the air passage disc is arranged in the annular mounting groove, and the air outlet direction of the air outlet is towards the rotary table.

6. The high-speed direct drive rotary table of claim 1, wherein, The rotating disc and the retaining ring are integrally formed; or, the surface of the rotating disc towards the shell forms a recessed step surface at the junction of the outer peripheral surface, and the retaining ring is fastened to the step surface.

7. The high-speed direct drive rotary table according to any one of claims 1-6, wherein, The shell comprises a main shell and an upper end cover arranged on the upper end of the main shell; The high-speed direct-drive rotary table comprises an air inlet valve, the air inlet valve is arranged on the main shell, a first flow channel is formed in the main shell and communicates with the air inlet valve, a second flow channel is formed in the upper end cover and communicates with the first flow channel, and the gas supply hole communicates with the second flow channel.

8. The high-speed direct drive rotary table according to any one of claims 1-6, wherein, The high-speed direct-drive rotary table comprises a brake pad, the brake pad is located in the shell and fixed to the rotating shaft; The shell has a mounting sub-cavity and an abutting portion, the mounting sub-cavity and the abutting portion are located on opposite sides of the brake pad, a piston is arranged in the mounting sub-cavity, the piston can be extended to clamp the brake pad in cooperation with the abutting portion, or retracted to release the clamping.

9. The high-speed direct drive rotary table according to any one of claims 1-6, wherein, The high-speed direct-drive rotary table comprises a stator and a rotor, the stator is fixed in the shell, the rotor is fixed to the rotating shaft, and the rotor cooperates with the stator to drive the rotating shaft to rotate.

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