Axially compact workpiece spindle

Abstract

The utility model discloses an axially compact workpiece spindle which comprises a mandrel and a motor. The mandrel is parallel to an output shaft of the motor, and the output shaft of the motor is in transmission connection with the rear end of the mandrel; the motor is arranged on the periphery of the core shaft, so that a main body of the motor coincides with the core shaft. The motor is arranged on the periphery of the core shaft, and the main body of the motor is ensured to coincide with the core shaft, so that the layout of the workpiece main shaft in the axial direction is more compact, the axial length of the workpiece main shaft is shortened, and the rigidity of the workpiece main shaft is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of machine tool equipment technology, and in particular to an axially compact workpiece spindle. Background Technology

[0002] CNC machine tools, as efficient, precise, and multifunctional machine tools, occupy a vital position in modern manufacturing. The workpiece spindle, as a key component in CNC machine tools responsible for controlling workpiece rotation, plays a crucial role in ensuring high-precision machining. Currently, most workpiece spindles are equipped with rear-mounted motors, which relatively increases the spindle's axial length, resulting in insufficient rigidity. This structural defect can cause vibration and deformation problems during machining, thus affecting machining accuracy, reducing workpiece surface quality, and ultimately leading to reduced production efficiency and product quality. Summary of the Invention

[0003] This invention provides an axially compact workpiece spindle to improve the rigidity of the workpiece spindle and alleviate a series of problems caused by insufficient rigidity.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An axially compact workpiece spindle includes: a mandrel and a motor;

[0006] The spindle and the output shaft of the motor are parallel to each other, and the output shaft of the motor is connected to the rear end of the spindle via a transmission connection.

[0007] The motor is disposed on the outer periphery of the spindle, such that the main body of the motor overlaps with the spindle.

[0008] Furthermore, the main body of the motor is completely overlapped with the spindle.

[0009] Furthermore, it also includes a driving gear disposed on the output shaft of the motor and a driven gear disposed on the spindle, the motor being connected to the spindle via the driving gear and the driven gear.

[0010] Furthermore, the motor has multiple motors arranged circumferentially around the spindle.

[0011] Furthermore, it also includes idler gears disposed between the driving gear and the driven gear, wherein the idler gears mesh with the driving gear and the driven gear respectively, and the number of idler gears corresponds one-to-one with the number of driving gears.

[0012] Furthermore, it also includes a gearbox connected to the spindle, wherein the driving gear, driven gear, and idler gear are disposed within the gearbox.

[0013] Furthermore, it also includes a spindle box, in which the spindle is rotatably disposed and the motor is disposed.

[0014] Furthermore, the motor has a built-in encoder, and the spindle is equipped with an encoder.

[0015] Furthermore, a brake disc is provided at the rear end of the spindle.

[0016] Furthermore, it also includes a brake that can brake the brake disc.

[0017] Beneficial effects: The workpiece spindle provided by this utility model has a more compact axial layout by setting the motor on the outer periphery of the mandrel, so that the main body of the motor coincides with the mandrel, thereby shortening the axial length of the workpiece spindle and effectively improving the rigidity of the workpiece spindle. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a rear view of an axially compact workpiece spindle disclosed in this utility model;

[0020] Figure 2 for Figure 1 DD sectional view;

[0021] Figure 3 This is a front view of an axially compact workpiece spindle disclosed in this utility model;

[0022] Figure 4 This is a schematic diagram of the spindle box of an axially compact workpiece spindle disclosed in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of a gearbox for an axially compact workpiece spindle disclosed in this utility model;

[0024] Figure 6 This is a schematic diagram of the cooperation between the brake and the brake disc of an axially compact workpiece spindle disclosed in this utility model.

[0025] Figure 7 This is a cross-sectional schematic diagram of a clamping plate for an axially compact workpiece spindle disclosed in this utility model.

[0026] Figure 8This utility model discloses a schematic diagram of the brake oil circuit for a workpiece spindle with a compact axial direction. Figure 1 ;

[0027] Figure 9 This utility model discloses a schematic diagram of the brake oil circuit for a workpiece spindle with a compact axial direction. Figure 2 ;

[0028] Figure 10 This is a schematic diagram of the structure of a limiting block for an axially compact workpiece spindle disclosed in this utility model.

[0029] In the picture:

[0030] 1. Mandrel;

[0031] 2. Electric motor;

[0032] 3. Spindle box;

[0033] 4. Drive gear;

[0034] 5. Driven gear;

[0035] 6. Idler wheel;

[0036] 7. Gearbox;

[0037] 8. Idler shaft;

[0038] 9. Spindle encoder;

[0039] 10. Brake;

[0040] 11. Brake disc.

[0041] 12. Connecting bracket;

[0042] 13. Clamping plate; 131. Blind hole;

[0043] 14. Brake pads;

[0044] 15. Double-acting hydraulic cylinder; 151. Cylinder body; 152. Piston rod; 153. Pressure cap; 154. Linkage mechanism;

[0045] 16. Limit block;

[0046] 17. Sleeve;

[0047] 18. Front sealing cover. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0049] This embodiment provides an axially compact workpiece spindle, such as... Figure 2 and Figure 3 As shown, it includes: spindle 1 and motor 2;

[0050] The output shafts of the spindle 1 and the motor 2 are parallel to each other, and the output shaft of the motor 2 is connected to the rear end of the spindle 1 for transmission.

[0051] The motor 2 is disposed on the outer periphery of the spindle 1, such that the main body of the motor 2 overlaps with the spindle 1;

[0052] This embodiment provides an axially compact workpiece spindle. By setting the motor 2 on the outer periphery of the spindle 1 and ensuring that the main body of the motor 2 overlaps with the spindle 1, the axial layout of the workpiece spindle is more compact, thereby shortening the axial length of the workpiece spindle and effectively improving the rigidity of the workpiece spindle. In practical applications, this design can also be used for machine tool components with rotating axes, such as rotary tables and swivel heads.

[0053] In a specific embodiment, such as Figure 2 As shown, the main body of the motor 2 is completely overlapped with the spindle 1, and the main body of the motor 2 is completely within the length range of the spindle 1. At this time, the axial length of the workpiece spindle is the shortest.

[0054] In a specific embodiment, such as Figure 2 As shown, it also includes a drive gear 4 disposed on the output shaft of the motor 2 and a driven gear 5 disposed on the spindle 1. The motor 2 is connected to the spindle 1 through the drive gear 4 and the driven gear 5.

[0055] In a specific embodiment, there are multiple motors 2, which are arranged circumferentially around the spindle 1. In this embodiment, for example... Figure 3 As shown, it includes two motors 2, and the dual-motor backlash elimination can be achieved through the two motors 2.

[0056] In a specific embodiment, such as Figure 2 As shown, it also includes an idler gear 6 disposed between the driving gear 4 and the driven gear 5. The idler gear 6 meshes with the driving gear 4 and the driven gear 5 respectively, and the number of idler gears 6 corresponds one-to-one with the number of driving gears 4.

[0057] With the center distance between the driving gear 4 and the driven gear 5 remaining unchanged, adding an idler gear 6 can reduce the diameter of the driving gear 4 and the driven gear 5, making the driving gear 4 and the driven gear 5 suitable for higher speeds.

[0058] In a specific embodiment, such as Figure 2 As shown, it also includes, for example Figure 4 The spindle box 3 shown in this embodiment also includes a sleeve 17 and a front sealing cover 18. The spindle box 3, sleeve 17 and front sealing cover 18 are fixed by bolts. The spindle 1 is rotatably mounted on the sleeve 17 inside the spindle box 3 by bearings. The motor 2 is located inside the spindle box 3. Water cooling pipes can be installed inside the spindle box 3 to reduce the thermal elongation of the workpiece spindle through cooling.

[0059] It also includes, for example, a component connected to the mandrel 1. Figure 5 The gearbox 7 shown is fixed on the main shaft box 3. The driving gear 4, driven gear 5 and idler gear 6 are disposed in the gearbox 7. The driving gear 4 is rotatably disposed in the gearbox 7 through bearings. The idler gear shaft 8 is rotatably disposed in the gearbox 7 through bearings. The idler gear 6 is disposed on the idler gear shaft 8. The gearbox 7 provides protection for the driving gear 4, driven gear 5 and idler gear 6.

[0060] In a specific embodiment, the motor 2 has a built-in encoder, such as... Figure 2 As shown, the spindle 1 is equipped with a spindle encoder 9 to facilitate closed-loop control of the workpiece spindle. The spindle encoder 9 includes, but is not limited to, gear encoders, circular grating encoders, magnetic grating encoders, and steel grating encoders.

[0061] In a specific embodiment, such as Figure 2 As shown, a brake disc 11 is fixed at the rear end of the spindle 1 to facilitate braking of the spindle 1.

[0062] In a specific embodiment, such as Figure 1 As shown, it also includes a brake 10. In this embodiment, the brake 10 is disposed on the gearbox 7 and the brake 10 is capable of braking the brake disc 11.

[0063] In this embodiment, as Figure 2 and Figure 6 As shown, the brake 10 includes a connecting bracket 12, a double-acting cylinder 15, and two opposing clamping plates 13. The clamping plates 13 extend tangentially along the brake disc 11 and are fixed to the connecting bracket 12 by bolts. The connecting bracket 12 and the double-acting cylinder 15 are fixed to the gearbox 7 by bolts.

[0064] like Figure 7 As shown, the clamping plate 13 is equipped with a brake pad 14, such as Figure 6As shown, there is a fitting gap A between the two opposing brake pads 14 to accommodate the brake disc 11. The size of the fitting gap A is equal to the sum of the thickness B of the brake disc 11 and twice the initial gap s. The size of the initial gap s is 0.1-0.5 mm.

[0065] In this embodiment, the brake pad 14 is made of resin, which has a high coefficient of friction and low cost. The brake pad 14 is attached to the clamping plate 13, making it easy to replace.

[0066] like Figure 7 As shown, a blind hole 131 is provided on the side of the clamping plate 13 away from the brake pad 14, such as Figure 6 As shown, the double-acting hydraulic cylinder 15 includes a cylinder body 151, symmetrically arranged piston rods 152 and pressure caps 153. The piston rod 152, at its end away from the piston, has a linkage part 154 located within a blind hole 132. The clamping plate 13 is fixed with bolts as shown in the image. Figure 10 The limiting block 16 shown can prevent the linkage part 154 from disengaging from the blind hole 132;

[0067] When the piston rod 152 drives the two oppositely arranged brake pads 14 to approach each other, the end of the linkage 154 away from the piston abuts against the bottom of the blind hole 132.

[0068] When the piston rod 152 drives the two oppositely arranged brake pads 14 to move away from each other, the end of the linkage 154 near the piston abuts against the limiting block 16.

[0069] A gap is left between the outer periphery of the linkage 154 and the inner wall of the blind hole 132. This gap prevents the side wall of the blind hole 132 from contacting the linkage 154, thus avoiding the formation of a force transmission path.

[0070] The cylinder body 151 and the pressure cap 153 form two inner cavities. The piston rod 152 has one end with the piston placed in the inner cavity and divides the inner cavity into a rod chamber and a rodless chamber. The two rod chambers share a common oil inlet and outlet port, and the two rodless chambers share a common oil inlet and outlet port.

[0071] The opening and clamping operations of the double-acting cylinder 15 are both hydraulically driven, which is fast and efficient, and does not require additional system delay. The symmetrical layout of the piston rod 152 ensures that the pressure is sealed inside the double-acting cylinder 15, thereby avoiding the application of axial force to the bearing of the spindle 1 and preventing axial movement.

[0072] like Figure 8 As shown, the cylinder block 151 is provided with an oil passage for connecting to the rodless chamber. Figure 8 The hole on the left side is the oil inlet and outlet. Injecting oil through this inlet and outlet allows the piston rods 152 to move closer together, thus clamping and braking the brake disc 11. Figure 8 The two holes in the upper middle part can be sealed with plugs, such as... Figure 9As shown, the cylinder block 151 is provided with an oil passage for connecting to the rod chamber. Figure 9 The hole on the left side is the oil inlet and outlet. Injecting oil through this inlet and outlet will cause the piston rods 152 to move away from each other, thus releasing the brake disc 11 by loosening it. Figure 9 The two holes in the upper middle part can be sealed with plugs.

[0073] In the design of traditional machine tool brakes, the brake pads are directly mounted on the piston rod of the hydraulic cylinder. The friction pair formed by the brake pads and the brake disc directly transmits the force to the hydraulic cylinder. The force transmitted from the friction pair may cause the piston to deviate from the center of the cylinder cavity, which in turn causes the feed direction of the hydraulic cylinder to deviate, accelerates the wear of the piston and cylinder wall, easily damages the sealing surface, and ultimately leads to brake failure, posing a potential threat to the stable operation and safety of the machine tool.

[0074] Compared to traditional brakes, the brake 10 provided in this embodiment transfers the brake pads 14 from the double-acting cylinder 15 to the clamping plate 13. At the same time, by making the linkage part of the piston rod 152 not constrained by the clamping plate 13 in the direction perpendicular to the axial direction of the brake disc 11, the force transmission path is changed, so that the double-acting cylinder 15 only provides pressure and does not participate in the transmission of force, avoiding the impact of high braking torque on the double-acting cylinder 15 itself, thereby effectively ensuring the safe and stable operation of the machine tool.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An axially compact workpiece spindle, characterized in that, include: Mandrel (1) and motor (2); The output shafts of the spindle (1) and the motor (2) are parallel to each other, and the output shaft of the motor (2) is connected to the rear end of the spindle (1) via a transmission. The motor (2) is disposed on the outer periphery of the spindle (1) such that the main body of the motor (2) overlaps with the spindle (1).

2. The axially compact workpiece spindle according to claim 1, characterized in that, The main body of the motor (2) is completely overlapped with the spindle (1).

3. The axially compact workpiece spindle according to claim 1, characterized in that, It also includes a drive gear (4) disposed on the output shaft of the motor (2) and a driven gear (5) disposed on the spindle (1), and the motor (2) is connected to the spindle (1) through the drive gear (4) and the driven gear (5).

4. The axially compact workpiece spindle according to claim 3, characterized in that, The motor (2) has multiple motors (2) arranged circumferentially around the spindle (1).

5. The axially compact workpiece spindle according to claim 3, characterized in that, It also includes an idler gear (6) disposed between the driving gear (4) and the driven gear (5), wherein the idler gear (6) meshes with the driving gear (4) and the driven gear (5) respectively, and the number of the idler gears (6) corresponds one-to-one with the number of driving gears (4).

6. The axially compact workpiece spindle according to claim 5, characterized in that, It also includes a gearbox (7) connected to the spindle (1), wherein the driving gear (4), driven gear (5) and idler gear (6) are disposed in the gearbox (7).

7. The axially compact workpiece spindle according to claim 1, characterized in that, It also includes a spindle box (3), the spindle (1) is rotatably disposed in the spindle box (3), and the motor (2) is disposed in the spindle box (3).

8. The axially compact workpiece spindle according to claim 1, characterized in that, The motor (2) has its own encoder, and the spindle (1) is equipped with an encoder.

9. The axially compact workpiece spindle according to claim 1, characterized in that, The rear end of the mandrel (1) is provided with a brake disc (11).

10. The axially compact workpiece spindle according to claim 9, characterized in that, It also includes a brake (10) that can brake the brake disc (11).

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