Power mechanism

Abstract

The present invention relates to the technical field of machining centers, and discloses a power mechanism, which includes: an oil nozzle support plate; a rotating motor; a bearing seat, which is arranged as a cylindrical structure, the bearing seat is rotatably arranged on the oil nozzle support plate, and the bearing seat is drivingly connected to the output end of the rotating motor; a screw nut, which is fixedly connected to the bearing seat; a screw, which is fixedly connected to a fixed part, and a bearing sleeve is connected to a movable part, a central through hole is arranged on the bearing seat, the screw is passed through the central through hole, and the screw nut is threadedly connected to the screw; a bearing sleeve, which is used to connect a linear movable part, the bearing sleeve is connected to the oil nozzle support plate, and the bearing sleeve is rotatably sleeved on the bearing seat. The power mechanism provided by the present invention can reduce the driving inertia and the performance requirements of the rotating motor, improve the response and acceleration performance of the driving system, and has a simple and compact overall structure, small space occupation, and low equipment cost.

Description

Technical Field

[0001] The invention relates to the technical field of machining centers, in particular to a power mechanism. Background Art

[0002] A machining center is a CNC milling machine with a tool magazine. It has strong adaptability and flexibility in parts processing and can automatically process parts with particularly complex contours or difficult to control dimensions, such as mold parts and housing parts.

[0003] Machining centers usually use screw-nut mechanisms as transmission structures. Existing screw-nut mechanisms usually have the following transmission forms:

[0004] 1. The nut is fixed, the screw rod rotates and moves. This transmission form supports the screw rod by the nut, which can eliminate additional axial movement, but the rigidity of the structure is poor;

[0005] 2. The screw rotates and the nut moves. The screw rigidity of this transmission form is good, but the rotation of the nut needs to be limited, so a guide device needs to be added;

[0006] 3. The nut rotates and the screw moves. This transmission form needs to limit the movement of the nut and the rotation of the screw during transmission. The overall structure is complex, occupies a large space, and has a high cost.

[0007] Therefore, a power mechanism is needed urgently to solve the above-mentioned technical problems. Summary of the invention

[0008] Based on the above, the purpose of the present invention is to provide a power mechanism, reduce the driving inertia and the performance requirements of the rotating motor, improve the response and acceleration performance of the drive system, and the overall structure is simple and compact, occupies a small space, and has low equipment cost.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] Provide power mechanism, including:

[0011] Oil nozzle support plate;

[0012] Rotating electrical machines;

[0013] A bearing seat is provided as a cylindrical structure, the bearing seat is rotatably provided on the oil nozzle support plate, and the bearing seat is drivingly connected to the output end of the rotating motor;

[0014] A screw nut, fixedly connected to the bearing seat;

[0015] A screw rod is fixedly connected to the fixed part, a bearing sleeve is connected to the movable part, a central through hole is provided on the bearing seat, the screw rod is passed through the central through hole, and the screw rod nut is threadedly connected to the screw rod;

[0016] The bearing sleeve is used to connect the linear movable part. The bearing sleeve is connected to the oil nozzle support plate. The bearing sleeve is rotatably sleeved on the bearing seat.

[0017] Specifically, the power mechanism drives the lead screw nut to rotate on the lead screw through a rotating motor, so as to drive the bearing sleeve to move in a straight line, thereby causing the linear movable part connected to the bearing sleeve to move in a straight line. Since the lead screw nut is fixed to the bearing seat, and the lead screw is fixed, the rotating motor drives the lead screw nut to rotate through the bearing seat. While supporting the lead screw and the lead screw nut, the bearing seat acts as a transmission part between the rotating motor and the lead screw nut on the one hand, and can move along the lead screw with the lead screw nut on the other hand, so that the bearing sleeve mounted on the bearing seat moves in a straight line, reducing the driving inertia and the performance requirements of the rotating motor, improving the response and acceleration performance of the drive system, and the overall structure is simple and compact, without the need to set additional transmission parts or limit parts, occupying a small space, and having low equipment cost.

[0018] As an optional technical solution of the power mechanism, the power mechanism further includes a rolling bearing, the rolling bearing is tightly mounted on the bearing seat, and the bearing sleeve is tightly mounted on the rolling bearing.

[0019] As an optional technical solution for the power mechanism, a limiting boss is provided on the outer periphery of the bearing seat, and the power mechanism also includes a bearing spacer and a bearing spacer. The bearing spacer is fixedly sleeved on the bearing seat, and two rolling bearings are spaced apart between the bearing spacer and the limiting boss, one of the rolling bearings abuts against the limiting boss, and the other rolling bearing abuts against the bearing spacer. The bearing spacer is sleeved on the bearing seat, and the two ends of the bearing spacer respectively abut against the side walls of the two rolling bearings.

[0020] As an optional technical solution of the power mechanism, the power mechanism also includes:

[0021] A bearing gland, the bearing gland is sleeved on the bearing spacer, the bearing gland is provided with a protruding portion, the protruding portion abuts against the outer ring side wall of the rolling bearing adjacent thereto, and the bearing sleeve is pressed against the protruding portion from the outside to clamp the bearing gland and the bearing spacer;

[0022] A locking nut is sleeved on the bearing seat and threadedly connected to the bearing seat. The locking nut is pressed against a side wall of the bearing spacer that is away from the rolling bearing to limit the axial position of the bearing spacer.

[0023] As an optional technical solution for the power mechanism, the bearing spacer includes an inner spacer and an outer spacer, the inner spacer abuts against the inner ring side walls of the two rolling bearings, the outer spacer abuts against the outer ring side walls of the two rolling bearings, and the inner spacer and the outer spacer are spaced apart.

[0024] As an optional technical solution of the power mechanism, a sealing flange is provided at one end of the bearing seat connected to the screw nut. The sealing flange is arranged around the outer periphery of the screw nut, and the sealing flange is sealed against the peripheral wall of the screw nut.

[0025] As an optional technical solution for the power mechanism, the rolling bearing adopts an angular contact bearing.

[0026] As an optional technical solution of the power mechanism, the power mechanism further includes an oil nozzle lubrication plate, the oil nozzle lubrication plate is fixedly connected to the oil nozzle support plate, the oil nozzle lubrication plate is provided with a clearance through hole, the screw rod is passed through the clearance through hole, and the power mechanism further includes:

[0027] A nut sealing ring is fixedly connected to the oil nozzle lubrication plate, and the nut sealing ring is sealingly abutted against the peripheral wall of the screw nut to block the gap between the screw nut and the oil nozzle lubrication plate, thereby effectively limiting the grease on the screw;

[0028] The screw sealing block is arranged as an annular structure and is sleeved on the screw. The screw sealing block is connected to the side of the grease nozzle lubrication plate away from the screw nut. A nut dust ring is installed on the screw sealing block. The nut dust ring abuts against the peripheral wall of the screw to seal the gap between the screw and the grease nozzle lubrication plate, thereby effectively limiting the grease on the screw.

[0029] As an optional technical solution of the power mechanism, the power mechanism further includes a synchronous belt transmission assembly, and the synchronous belt transmission assembly includes:

[0030] An active synchronous wheel, fixed to the output shaft of the rotating motor;

[0031] A driven synchronous wheel, fixedly sleeved on the bearing seat;

[0032] The synchronous belt is sleeved on the active synchronous wheel and the driven synchronous wheel, and the synchronous belt wheel is transmission-connected with the active synchronous wheel and the driven synchronous wheel at the same time.

[0033] As an optional technical solution of the power mechanism, the synchronous belt drive assembly also includes:

[0034] A first expansion sleeve, which is fixedly mounted on the output shaft of the rotating motor, and the outer peripheral wall of the first expansion sleeve is clamped with the mounting hole of the active synchronous wheel;

[0035] The second expansion sleeve is fixedly mounted on the bearing seat, and the outer peripheral wall of the second expansion sleeve is clamped with the mounting hole of the driven synchronous wheel.

[0036] The beneficial effects of the present invention are:

[0037] The power mechanism provided by the present invention drives the screw nut to rotate on the screw by a rotating motor, so as to drive the bearing sleeve to move in a straight line, thereby causing the linear movable part connected to the bearing sleeve to move in a straight line. Since the screw nut is fixed to the bearing seat and the screw is fixed, the rotating motor drives the screw nut to rotate through the bearing seat. While supporting the screw and the screw nut, the bearing seat acts as a transmission part between the rotating motor and the screw nut on the one hand, and can move along the screw with the screw nut on the other hand, so that the bearing sleeve mounted on the bearing seat moves in a straight line, reducing the driving inertia and the performance requirements of the rotating motor, improving the response and acceleration performance of the drive system, and the overall structure is simple and compact, without the need to set additional transmission parts or limit parts, occupying a small space, and having low equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0039] Figure 1 is a schematic structural diagram of a power mechanism provided by an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 Schematic diagram of the enlarged area A in the middle.

[0041] In the figure:

[0042] 1. Oil nozzle support plate; 2. Rotating motor; 3. Bearing seat; 4. Screw nut; 5. Screw; 6. Rolling bearing; 7. Bearing sleeve; 8. Bearing spacer; 9. Bearing spacer; 91. Inner spacer; 92. Outer spacer; 10. Bearing gland; 101. Protruding part; 11. Locking nut; 12. Oil nozzle lubrication plate; 121. Make way through hole; 13. Nut sealing ring; 14. Screw sealing block; 15. Nut dust ring; 16. Active synchronous wheel; 17. Driven synchronous wheel; 18. Synchronous belt; 19. First expansion sleeve; 20. Second expansion sleeve; 21. Expansion sleeve gland; 22. Motor seat. DETAILED DESCRIPTION

[0043] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] like Figure 1-Figure 2 As shown, this embodiment provides a power mechanism, which is a component of a machining center, and is particularly suitable for a five-axis linkage machining center with a crane-type structure. The power mechanism is connected to a linear movable part and is used to drive the linear movable part to move linearly in a horizontal or vertical direction.

[0045] Further, such as Figure 1 As shown, the power mechanism includes an oil nozzle support plate 1, a rotating motor 2, a bearing seat 3, a screw nut 4, a screw 5 and a bearing sleeve 7. The rotating motor 2 is fixedly installed by the motor seat 22. The bearing seat 3 is set as a cylindrical structure. The bearing seat 3 is rotatably set on the oil nozzle support plate 1. The bearing seat 3 is transmission-connected to the output end of the rotating motor 2. The screw nut 4 is fixedly connected to the bearing seat 3. The screw 5 is fixedly connected to the fixing part. A central through hole is set on the bearing seat 3. The screw 5 is penetrated by the central through hole. The screw nut 4 is threadedly connected to the screw 5. The bearing sleeve 7 is used to connect the linear movable part. The bearing sleeve 7 is connected to the oil nozzle support plate 1, and the bearing sleeve 7 is rotatably sleeved on the bearing seat 3.

[0046] Specifically, the power mechanism provided in this embodiment drives the screw nut 4 to rotate on the screw 5 through the rotating motor 2, so as to drive the bearing sleeve 7 to move in a straight line, so that the linear movable part connected to the bearing sleeve 7 moves in a straight line accordingly. Since the screw nut 4 is fixed to the bearing seat 3, and the screw 5 is fixedly arranged, the rotating motor 2 drives the screw nut 4 to rotate through the bearing seat 3. While supporting the screw 5 and the screw nut 4, the bearing seat 3 acts as a transmission part between the rotating motor 2 and the screw nut 4 on the one hand, and can move along the screw 5 with the screw nut 4 on the other hand, so that the bearing sleeve 7 rotatably sleeved on the bearing seat 3 moves in a straight line accordingly, reducing the driving inertia and the performance requirements of the rotating motor 2, and improving the response and acceleration performance of the drive system. The overall structure is simple and compact, and no additional transmission parts or limit parts are required, which occupies a small space and has low equipment cost.

[0047] In this embodiment, if Figure 1As shown, the power mechanism further includes a rolling bearing 6, which is tightly sleeved on the bearing seat 3, and the bearing sleeve 7 is tightly sleeved on the rolling bearing 6. Specifically, the inner ring of the rolling bearing 6 is clamped with the bearing seat 3, and the outer ring of the rolling bearing 6 is clamped with the inner wall of the bearing sleeve 7. The bearing seat 3 is rotatably connected with the bearing sleeve 7 and the oil nozzle support plate 1 through the rolling bearing 6, so that the bearing seat 3 can rotate with the screw nut 4 when the bearing sleeve 7 and the oil nozzle support plate 1 do not rotate.

[0048] For example, Figure 1-2 As shown, a limiting boss is provided on the outer periphery of the bearing seat 3, and the power mechanism further includes a bearing spacer 8 and a bearing spacer 9. The bearing spacer 8 is fixedly sleeved on the bearing seat 3, and two rolling bearings 6 are arranged at intervals between the bearing spacer 8 and the limiting boss, wherein one rolling bearing 6 abuts against the limiting boss, and the other rolling bearing 6 abuts against the bearing spacer 8. The bearing spacer 9 is sleeved on the bearing seat 3, and the two ends of the bearing spacer 9 abut against the side walls of the two rolling bearings 6. Specifically, the limiting boss and the bearing spacer respectively limit the two rolling bearings 6 from the outside, and the bearing spacer 9 is arranged between the two rolling bearings 6 to limit the spacing between the two rolling bearings 6, thereby maintaining the axial position of the two rolling bearings 6, thereby improving the stability of the overall structure.

[0049] For example, Figure 1 As shown, the bearing spacer 9 includes an inner spacer 91 and an outer spacer 92. The inner spacer 91 abuts against the inner ring side walls of the two rolling bearings 6, and the outer spacer 92 abuts against the outer ring side walls of the two rolling bearings 6. The inner spacer 91 and the outer spacer 92 are spaced apart.

[0050] For example, Figure 1 and Figure 2 As shown, the power mechanism also includes a bearing cover 10 and a locking nut 11. The bearing cover 10 is sleeved on the bearing spacer 8. The bearing cover 10 is provided with a protruding portion 101. The protruding portion 101 abuts against the outer ring side wall of the rolling bearing 6 adjacent thereto, and the bearing sleeve 7 presses against the protruding portion 101 from the outside to clamp the bearing cover 10 and the bearing spacer 8, and the bearing seat 3 presses against the outer ring side wall of another rolling bearing 6 from the outside; the locking nut 11 is sleeved on the bearing seat 3 and is threadedly connected with the bearing seat 3, and the locking nut 11 presses against the side wall of the bearing spacer 8 away from the rolling bearing 6 to limit the axial position of the bearing spacer 8. Specifically, the bearing cover 10, on the one hand, plays the role of pressing the rolling bearing 6 from the outer ring, and on the other hand, seals the rolling bearing 6 from the outside together with the bearing spacer 8; the locking nut 11 locks the axial position of the bearing spacer 8 to ensure that the rolling bearing 6 does not shift and maintains sealing.

[0051] For example, Figure 1 and Figure 2As shown, a sealing flange is provided at one end where the bearing seat 3 is connected to the screw nut 4. The sealing flange is arranged around the outer periphery of the screw nut 4, and the sealing flange seals against the peripheral wall of the screw nut 4. On the one hand, it prevents the lubricating oil between the screw 5 and the bearing seat 3 from leaking out from the gap between the bearing seat 3 and the screw nut 4, and on the other hand, it prevents external dust from entering from the gap between the bearing seat 3 and the screw nut 4, thereby ensuring the lubrication effect and making the relative movement between the screw 5 and the screw nut 4 smoother.

[0052] In this embodiment, the rolling bearing 6 is an angular contact bearing, which can bear radial and axial loads at the same time.

[0053] In this embodiment, the rotary electric machine 2 is a servo motor.

[0054] For example, Figure 1 As shown, the power mechanism also includes a nozzle lubricating plate 12, which is fixedly connected to the nozzle support plate 1 by bolts, and a clearance through hole 121 is provided on the nozzle lubricating plate 12, and the screw 5 is passed through the clearance through hole 121. The power mechanism also includes a nut sealing ring 13 and a screw sealing block 14. The nut sealing ring 13 is fixedly connected to the nozzle lubricating plate 12, and the nut sealing ring 13 is sealed against the peripheral wall of the screw nut 4 to block the gap between the screw nut 4 and the nozzle lubricating plate 12, and effectively limit the grease on the screw 5; the screw sealing block 14 is set as an annular structure and sleeved on the screw 5, and the screw sealing block 14 is connected to the side of the nozzle lubricating plate 12 away from the screw nut 4, and a nut dust ring 15 is installed on the screw sealing block 14, and the nut dust ring 15 is abutted against the peripheral wall of the screw 5 to block the gap between the screw nut 4 and the nozzle lubricating plate 12, and effectively limit the grease on the screw 5.

[0055] For example, Figure 1 As shown, the power mechanism also includes a synchronous belt transmission assembly, which includes a driving synchronous wheel 16, a driven synchronous wheel 17 and a synchronous belt 18. The driving synchronous wheel 16 is fixed to the output shaft of the rotating motor 2; the driven synchronous wheel 17 is fixedly sleeved on the bearing seat 3, and the synchronous belt 18 is sleeved on the driving synchronous wheel 16 and the driven synchronous wheel 17. The synchronous belt wheel is connected to the driving synchronous wheel 16 and the driven synchronous wheel 17 at the same time.

[0056] Further, such as Figure 1As shown, the synchronous belt transmission assembly also includes a first expansion sleeve 19 and a second expansion sleeve 20. The first expansion sleeve 19 is fixedly sleeved on the output shaft of the rotating motor 2, and the outer peripheral wall of the first expansion sleeve 19 is clamped with the mounting hole of the active synchronous wheel 16. The first expansion sleeve 19 is locked to the output shaft of the rotating motor 2 through the expansion sleeve gland 21; the second expansion sleeve 20 is fixedly sleeved on the bearing seat 3, and the outer peripheral wall of the second expansion sleeve 20 is clamped with the mounting hole of the driven synchronous wheel 17. The arrangement of the first expansion sleeve 19 and the second expansion sleeve 20 can increase the maximum torque that can be transmitted between the active synchronous wheel 16 and the rotating motor 2 and the driven synchronous wheel 17 and the bearing seat 3, thereby ensuring the synchronization of the transmission.

[0057] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power mechanism, characterized in that: include: Oil nozzle supporting plate (1); Rotating motor (2); The bearing seat (3) is arranged as a cylindrical structure, a limiting boss is arranged on the outer periphery of the bearing seat (3), the bearing seat (3) is rotatably arranged on the oil nozzle support plate (1), and the bearing seat (3) is drivingly connected to the output end of the rotating motor (2); A screw nut (4) is fixedly connected to the bearing seat (3); a sealing flange is provided at one end of the bearing seat (3) connected to the screw nut (4), the sealing flange is arranged around the outer periphery of the screw nut (4), and the sealing flange is sealingly abutted against the peripheral wall of the screw nut (4); The screw rod (5) is fixedly connected to the fixing member, the bearing seat (3) is provided with a central through hole, the screw rod (5) is passed through the central through hole, and the screw rod nut (4) is threadedly connected to the screw rod (5); A bearing sleeve (7) is used to connect the linear movable part, the bearing sleeve (7) is connected to the oil nozzle support plate (1), and the bearing sleeve (7) is rotatably sleeved on the bearing seat (3); A rolling bearing (6), the rolling bearing (6) being tightly mounted on the bearing seat (3), and the bearing sleeve (7) being tightly mounted on the rolling bearing (6); A bearing spacer (8), the bearing spacer (8) being fixedly sleeved on the bearing seat (3), two rolling bearings (6) being arranged at intervals between the bearing spacer (8) and the limiting boss, one of the rolling bearings (6) being in contact with the limiting boss, and the other of the rolling bearings (6) being in contact with the bearing spacer (8); A bearing spacer (9), the bearing spacer (9) being sleeved on the bearing seat (3), and two ends of the bearing spacer (9) respectively abutting against side walls of the two rolling bearings (6); A bearing cover (10), wherein the bearing cover (10) is sleeved on the bearing spacer (8), the bearing cover (10) is provided with a protruding portion (101), the protruding portion (101) abuts against the outer ring side wall of the rolling bearing (6) adjacent thereto, and the bearing sleeve (7) presses against the protruding portion (101) from the outside so that the bearing cover (10) and the bearing spacer (8) are clamped together; the bearing cover (10) and the bearing spacer (8) seal the rolling bearing (6) from the outside; a locking nut (11) sleeved on the bearing seat (3) and threadedly connected to the bearing seat (3), the locking nut (11) pressing against a side wall of the bearing spacer (8) facing away from the rolling bearing (6) to limit the axial position of the bearing spacer (8); An oil nozzle lubricating plate (12), the oil nozzle lubricating plate (12) being fixedly connected to the oil nozzle supporting plate (1), the oil nozzle lubricating plate (12) being provided with a clearance through hole (121), and the screw rod (5) being passed through the clearance through hole (121); A nut sealing ring (13) is fixedly connected to the oil nozzle lubrication plate (12), and the nut sealing ring (13) is sealingly abutted against a peripheral wall of the screw nut (4) to block a gap between the screw nut (4) and the oil nozzle lubrication plate (12); A screw seal block (14) is provided as an annular structure and is sleeved on the screw (5). The screw seal block (14) is connected to a side of the grease nozzle lubrication plate (12) away from the screw nut (4). A nut dust ring (15) is mounted on the screw seal block (14). The nut dust ring (15) abuts against a peripheral wall of the screw (5) to seal a gap between the screw (5) and the grease nozzle lubrication plate (12).

2. The power mechanism according to claim 1, characterized in that: The bearing spacer (9) comprises an inner spacer (91) and an outer spacer (92), wherein the inner spacer (91) abuts against the inner ring side walls of the two rolling bearings (6), and the outer spacer (92) abuts against the outer ring side walls of the two rolling bearings (6), and the inner spacer (91) and the outer spacer (92) are spaced apart.

3. The power mechanism according to claim 1, characterized in that: The rolling bearing (6) is an angular contact bearing.

4. The power mechanism according to any one of claims 1 to 3, characterized in that: The power mechanism also includes a synchronous belt transmission assembly, and the synchronous belt transmission assembly includes: An active synchronous wheel (16) fixed to the output shaft of the rotating motor (2); A driven synchronous wheel (17) fixedly sleeved on the bearing seat (3); A synchronous belt (18) is sleeved on the active synchronous wheel (16) and the driven synchronous wheel (17), and the synchronous belt (18) is drivingly connected to both the active synchronous wheel (16) and the driven synchronous wheel (17).

5. The power mechanism according to claim 4, characterized in that: The synchronous belt transmission assembly also includes: A first expansion sleeve (19) is fixedly sleeved on the output shaft of the rotating motor (2), the outer peripheral wall of the first expansion sleeve (19) being clamped to the mounting hole of the active synchronous wheel (16); The second expansion sleeve (20) is fixedly mounted on the bearing seat (3), and the outer peripheral wall of the second expansion sleeve (20) is clamped to the mounting hole of the driven synchronous wheel (17).

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