Direct drive structure without belt transmission

Abstract

The direct driving structure comprises an outer sleeve, a channel is formed in the outer sleeve, the two ends of the channel communicate with the two ends of the outer sleeve correspondingly, a main shaft is rotationally arranged in the channel, the two ends of the main shaft penetrate through the two ends of the outer sleeve correspondingly and extend out of the outer sleeve, and a motor is arranged in the channel and sleeves the main shaft; the main shaft is directly driven to rotate; the motor is arranged in the outer sleeve, the main shaft is sleeved with the motor, the motor can directly drive the main shaft to rotate when the motor is started, and therefore radial force applied to the main shaft when the main shaft is driven to rotate through an external driving structure in a traditional structure is eliminated, the main shaft can stably rotate, shaking of the main shaft is avoided, and the machining precision is improved; meanwhile, the built-in motor reduces the size of the device, and the occupied space is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of spindles, and particularly to a direct drive structure that eliminates belt drive. Background Art

[0002] A spindle for driving a workpiece to rotate is provided on a machine tool. In the prior art, the drive of the spindle is realized by a drive motor and a transmission mechanism arranged in a numerical control machine tool, such as a belt drive mechanism, a chain drive mechanism, etc.;

[0003] However, when using the above transmission mechanisms, such as a belt drive mechanism, which drives the belt to rotate through a drive motor and then drives the spindle to rotate, the belt will inevitably apply a radial force to the spindle, resulting in inevitable shaking of the spindle during rotation, so that the problem of low machining accuracy occurs. For this reason, we propose a direct drive structure that eliminates belt drive. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, it is desired to provide a direct drive structure that eliminates belt drive.

[0005] In a first aspect, the present application provides a direct drive structure that eliminates belt drive, including:

[0006] An outer sleeve, the length direction of the outer sleeve extends along a first direction, both ends of the outer sleeve are a first end and a second end respectively, and a channel is provided on the outer sleeve along the first direction, and both ends of the channel penetrate through the first end and the second end respectively;

[0007] A spindle, the length direction of the spindle extends along the first direction, the spindle is movably arranged in the channel, and both ends of the spindle are a third end and a fourth end respectively, and the third end and the fourth end penetrate through the first end and the second end respectively and extend outside the outer sleeve;

[0008] A motor, the motor is arranged in the channel and sleeved on the outer wall of the spindle for driving the spindle to rotate.

[0009] According to the technical solution provided by the embodiment of the present application, the channel includes a first installation section and a second installation section that are sequentially connected along the first direction. The first installation section is relatively close to the first end. The motor is arranged in the second installation section. The motor includes a stator and a rotor. The rotor is coaxially rotatably arranged inside the stator and is fixedly connected to the outer wall of the spindle. And a rotor bushing is arranged between the rotor and the spindle.

[0010] According to the technical solution provided by the embodiment of the present application, a first bearing and a second bearing are arranged in the first installation section along the first direction. The second bearing is relatively closer to the motor. The inner rings of the first bearing and the second bearing are both fixedly sleeved on the outer wall of the main shaft, and the outer rings of the first bearing and the second bearing are both connected to the inner wall of the first installation section.

[0011] According to the technical solution provided by the embodiment of the present application, a spacer group is arranged between the first bearing and the second bearing. The spacer group includes an outer spacer and an inner spacer. The inner spacer is sleeved on the outer wall of the main shaft, and its two opposite side walls in the first direction respectively contact the inner rings of the first bearing and the second bearing. The outer spacer is sleeved on the outer wall of the inner spacer, and its two opposite side walls in the first direction respectively contact the outer rings of the first bearing and the second bearing.

[0012] According to the technical solution provided by the embodiment of the present application, a flange is arranged at the first end, and the flange is sleeved on the third end of the main shaft. A sealing ring is arranged between the flange and the first end. A dynamic sealing gasket is arranged on the inner wall of the flange close to the first end, and the dynamic sealing gasket is sleeved on the outer wall of the main shaft and contacts the side wall of the inner ring of the first bearing close to the first end. A static sealing gasket is arranged on one side of the first bearing close to the first end. The two ends of the static sealing gasket in the first direction respectively contact the dynamic sealing gasket and the side wall of the outer ring of the first bearing close to the first end.

[0013] According to the technical solution provided by the embodiment of the present application, a bearing sleeve is arranged at the second end. A third bearing is arranged in the bearing sleeve, and the inner ring of the third bearing is fixedly sleeved on the outer wall of the main shaft. A bearing spacer is arranged between one side of the third bearing close to the second end and the second end of the outer sleeve.

[0014] According to the technical solution provided by the embodiment of the present application, a coupling sleeve is fixedly arranged at one end of the bearing sleeve far from the outer sleeve. A through hole is penetrated through the coupling sleeve. The second end of the main shaft movably penetrates through the through hole and extends outside the coupling sleeve, and an oil cylinder coupling disc is arranged.

[0015] In summary, the present technical solution specifically discloses a direct drive structure without belt drive, including an outer sleeve. The length direction of the outer sleeve extends along the first direction, and the two ends of the outer sleeve are respectively a first end and a second end. A channel is opened on the outer sleeve, and the two ends of the channel are respectively communicated with the first end and the second end. A main shaft extending along the first direction is rotatably arranged in the channel. The two ends of the main shaft are respectively a third end and a fourth end. The third end and the fourth end respectively penetrate through the first end and the second end and extend to the outside of the outer sleeve. A motor is arranged in the channel. The motor is sleeved on the main shaft and is used to directly drive the main shaft to rotate;

[0016] By integrating the motor inside the outer casing, with the motor sleeved on the main shaft, starting the motor enables the motor to directly drive the main shaft to rotate. This eliminates the radial force applied to the main shaft when driving the main shaft to rotate through an external drive structure in the traditional structure, thereby enabling the main shaft to rotate stably, avoiding the shaking of the main shaft, and further improving the accuracy during processing. At the same time, the integrated motor reduces the volume of the device and the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0018] Figure 1 Schematic diagram of a direct drive structure for eliminating belt drive.

[0019] Reference numerals in the drawings: 1, outer casing; 2, main shaft; 3, motor; 4, nail; 5, rotor; 6, rotor bushing; 7, first bearing; 8, second bearing; 9, outer spacer; 10, inner spacer; 11, flange; 12, sealing ring; 13, dynamic sealing gasket; 14, static sealing gasket; 15, bearing sleeve; 16, third bearing; 17, bearing spacer; 18, coupling sleeve; 19, oil cylinder coupling plate; 20, rotary sealing gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the related invention and not for limiting the invention. Additionally, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings.

[0021] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] Embodiment 1

[0023] Please refer to Figure 1 , a direct drive structure for eliminating belt drive, including an outer casing 1. The length direction of the outer casing 1 extends along a first direction. The two ends of the outer casing 1 are respectively a first end and a second end, and a channel is provided on the outer casing 1 along the first direction. The two ends of the channel respectively penetrate through the first end and the second end; wherein, the first direction is Figure 1 the horizontal direction in

[0024] It further includes a main shaft 2. The length direction of the main shaft extends along the first direction, and the main shaft 2 is movably arranged in the channel. The two ends of the main shaft 2 are respectively a third end and a fourth end, and the third end and the fourth end respectively penetrate through the first end and the second end and extend outside the outer casing 1;

[0025] The channel rotates the main shaft by setting the motor 3 to drive; specifically, the channel includes a first installation section and a second installation section that are connected in sequence along a first direction. The first installation section is relatively close to the first end, and the motor 3 is arranged in the second installation section. The motor 3 includes a stator 4 and a rotor 5. The rotor 5 is coaxially rotatably arranged inside the stator 4 and sleeved on the outer wall of the main shaft 2. Thus, by starting the motor 3, the rotation of the rotor 5 drives the rotation of the main shaft 2; among them, the type of the motor 3, for example, is a direct drive motor;

[0026] It should be noted that a rotor bushing 6 is arranged between the rotor 5 and the main shaft 2, which can reduce wear.

[0027] A first bearing 7 and a second bearing 8 are arranged in the first installation section along the first direction. Among them, the second bearing 8 is relatively close to the motor 3, and the inner rings of the first bearing 7 and the second bearing 8 are fixedly sleeved on the outer wall of the main shaft 2, and the outer rings of the first bearing 7 and the second bearing 8 are fixedly connected to the inner wall of the first installation section;

[0028] A bearing sleeve 15 is arranged at the second end of the outer sleeve 1. A third bearing 16 is arranged inside the bearing sleeve 15. The inner ring of the third bearing 16 is fixedly sleeved on the outer wall of the main shaft 2. Through the first bearing 7, the second bearing 8, and the third bearing 16, the stability of the main shaft 2 during rotation can be ensured, avoiding the shaking of the main shaft 2. Moreover, the cooperation of the first bearing 7, the second bearing 8, and the third bearing 16 can extend the transmission distance and enable the device to adapt to a main shaft 2 with a longer length.

[0029] A spacer group is arranged between the first bearing 7 and the second bearing 8. The spacer group includes an outer spacer 9 and an inner spacer 10. The inner spacer 10 is sleeved on the outer wall of the main shaft 2, and its two opposite side walls in the first direction respectively contact the inner rings of the first bearing 7 and the second bearing 8; the outer spacer 9 is sleeved on the outer wall of the inner spacer 10, and its two opposite side walls in the first direction respectively contact the outer rings of the first bearing 7 and the second bearing 8. The outer spacer 9 and the inner spacer 10 are used to isolate the first bearing 7 and the second bearing 8 and do not affect the rotation of the first bearing 7 and the second bearing 8.

[0030] A flange 11 is arranged at the first end of the outer sleeve 1. The flange 11 is sleeved on the third end of the main shaft 2, and a sealing ring 12 is arranged between the flange 11 and the first end. Specifically, a sealing groove is opened at the first end, and the sealing ring 12 is arranged in the sealing groove and abuts against the flange 11;

[0031] A dynamic sealing gasket 13 is arranged on the inner wall of the flange 11 close to the first end. The dynamic sealing gasket 13 is sleeved on the outer wall of the main shaft 2 and contacts the side wall of the inner ring of the first bearing 7 close to the first end;

[0032] The static gasket 14 is arranged on one side of the first bearing 7 close to the first end. The two ends of the static gasket 14 in the first direction are respectively in contact with the dynamic gasket 13 and the side wall of the outer ring of the first bearing 7 close to the first end. Thus, through the sealing ring 12, the dynamic gasket 13 and the static gasket 14, the sealing performance inside the channel can be ensured, so that the device can work underwater and damage to the motor 3 can be prevented;

[0033] Furthermore, a rotary gasket 20 is arranged between the outer wall of the third end of the main shaft 2 and the inner wall of the end of the flange 11 away from the outer sleeve 1.

[0034] A bearing spacer 17 is arranged between one side of the third bearing 16 close to the second end and the second end of the outer sleeve 1 for isolating the third bearing 16 and the outer sleeve 1. A coupling sleeve 18 is fixedly arranged at the end of the bearing sleeve 15 away from the outer sleeve 1. A through hole is formed through the coupling sleeve 18. The second end of the main shaft 2 movably passes through the through hole and extends outside the coupling sleeve 18, and an oil cylinder coupling disc 19 is arranged. The oil cylinder coupling disc 19 can clamp a workpiece. Thus, the motor 3 drives the main shaft 2 to rotate, and the main shaft 2 clamps the workpiece through the oil cylinder coupling disc 19 and then drives the workpiece to rotate.

[0035] It should be noted that an encoder is also arranged on the bearing sleeve 15 for detecting the rotation angle of the main shaft 2.

[0036] Working principle: A channel communicating with the first end and the second end is opened in the outer sleeve 1. The main shaft 2 is rotatably arranged in the channel. The two ends of the main shaft 2 respectively penetrate through the first end and the second end and extend to the outside of the outer sleeve 1. A motor 3 is arranged in the channel. The motor 3 is sleeved on the outer wall of the main shaft 2. By starting the motor 3, the main shaft 2 can be driven to rotate. Thus, the motor 3 is built-in and directly drives the main shaft 2 to rotate, avoiding the radial force applied to the main shaft 2 when the main shaft 2 is driven to rotate by an external drive structure in the traditional structure, ensuring that the main shaft 2 can be stable and not affected by external radial force, and further ensuring the accuracy during the processing. And the built-in motor 3 can reduce the volume of the device and the occupied space of the device;

[0037] By arranging the first bearing 7, the second bearing 8 and the third bearing 16, the stability of the main shaft 2 during rotation is further improved, and the processing accuracy is improved.

[0038] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A direct drive structure without belt drive, characterized in that: include: A jacket (1), wherein the length direction of the jacket (1) extends along a first direction, the two ends of the jacket (1) are respectively a first end and a second end, and a channel is provided on the jacket (1) along the first direction, and the two ends of the channel are respectively arranged to pass through the first end and the second end; A main shaft (2), wherein the length direction of the main shaft (2) extends along the first direction, the main shaft (2) is movably arranged in the channel, and the two ends of the main shaft (2) are respectively a third end and a fourth end, the third end and the fourth end respectively penetrate the first end and the second end and extend to the outside of the outer sleeve (1); A motor (3), the motor (3) being arranged in the channel and sleeved on the outer wall of the main shaft (2), and being used for driving the main shaft (2) to rotate.

2. The direct drive structure without belt transmission according to claim 1, characterized in that: The channel comprises a first mounting section and a second mounting section which are connected in sequence along the first direction, the first mounting section being relatively close to the first end, the motor (3) being arranged in the second mounting section, the motor (3) comprising a stator (4) and a rotor (5), the rotor (5) being arranged coaxially rotatably on the inner side of the stator (4) and being fixedly connected to the outer wall of the main shaft (2), and a rotor bushing (6) being arranged between the rotor (5) and the main shaft (2).

3. The direct drive structure without belt transmission according to claim 2, characterized in that: A first bearing (7) and a second bearing (8) are arranged in the first installation section along the first direction, the second bearing (8) is relatively close to the motor (3), and the inner rings of the first bearing (7) and the second bearing (8) are fixedly sleeved on the outer wall of the main shaft (2), and the outer rings of the first bearing (7) and the second bearing (8) are connected to the inner wall of the first installation section.

4. The direct drive structure without belt transmission according to claim 3, characterized in that: A spacer group is provided between the first bearing (7) and the second bearing (8), the spacer group comprising an outer spacer (9) and an inner spacer (10), the inner spacer (10) being sleeved on the outer wall of the main shaft (2), and its two opposite side walls in the first direction respectively contact the inner rings of the first bearing (7) and the second bearing (8), and the outer spacer (9) being sleeved on the outer wall of the inner spacer (10), and its two opposite side walls in the first direction respectively contact the outer rings of the first bearing (7) and the second bearing (8).

5. The direct drive structure without belt transmission according to claim 3, characterized in that: The first end is provided with a flange (11), and the flange (11) is sleeved on the third end of the main shaft (2); a sealing ring (12) is provided between the flange (11) and the first end; a dynamic sealing gasket (13) is provided on the inner wall of the flange (11) close to the first end; the dynamic sealing gasket (13) is sleeved on the outer wall of the main shaft (2) and contacts the side wall of the inner ring of the first bearing (7) close to the first end; a static sealing gasket (14) is provided on one side of the first bearing (7) close to the first end; and the static sealing gasket (14) contacts the dynamic sealing gasket (13) and the side wall of the outer ring of the first bearing (7) close to the first end at two ends in the first direction.

6. The direct drive structure without belt transmission according to claim 1, characterized in that: The second end is provided with a bearing sleeve (15), a third bearing (16) is provided inside the bearing sleeve (15), and an inner ring of the third bearing (16) is fixedly sleeved on the outer wall of the main shaft (2), and a bearing spacer (17) is provided between a side of the third bearing (16) close to the second end and the second end of the outer sleeve (1).

7. The direct drive structure without belt transmission according to claim 6, characterized in that: A connecting sleeve (18) is fixedly provided at one end of the bearing sleeve (15) away from the outer sleeve (1), a through hole is formed through the connecting sleeve (18), and the second end of the main shaft (2) movably passes through the through hole and extends to the outside of the connecting sleeve (18), and is provided with a cylinder connecting plate (19).

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