A disc brake mechanism for a machine tool spindle

Abstract

The present invention relates to a disc brake mechanism for a machine tool spindle, comprising a spindle seat, a core shaft rotatably inserted into the spindle seat, and characterized in that: the core shaft extends backward from the tail end of the spindle seat, the tail end of the spindle seat is connected to a brake mechanism, the brake mechanism comprises a brake box connected to the spindle seat, one end of the core shaft extending into the brake box is connected to a first brake member, the brake box is connected to a second brake member, and the brake box is connected to a drive assembly for driving the second brake member to move. The present invention has the effects of large contact area, high braking efficiency and good stability.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, and in particular to a disc brake mechanism for a main shaft of a machine tool. Background Art

[0002] The CNC machine tool is provided with a spindle for driving the workpiece to rotate. In the prior art, the spindle is driven by a drive motor and a transmission mechanism provided in the CNC machine tool. When working, the spindle and the spindle rotate at high speed. When stopping working, the spindle and the spindle need to be braked to stop.

[0003] For example, a Chinese patent with announcement number CN202780653 discloses a CNC turning and milling compound machine tool, which includes a spindle box and a spindle. A cylinder plate is provided on the top of the spindle box, and a cylinder is provided on the cylinder plate. A support plate is provided on one side of the lower end of the cylinder plate, and a brake pad is provided on the other side of the support plate. The brake pad is fixed between the cylinder plate and the spindle.

[0004] The above-mentioned prior art solution has the following defects: when braking is required, the oil cylinder drives the support plate to move toward the brake pad, but the support plate rubs against the outer wall of the brake pad, and the small contact area leads to low braking efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide a machine tool spindle disc brake mechanism having the advantage of good braking effect.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: a machine tool spindle disc brake mechanism, including a spindle seat, a core shaft rotatably inserted into the spindle seat, the core shaft extending rearward from the tail end of the spindle seat, the tail end of the spindle seat is connected to a brake mechanism, the brake mechanism includes a brake box connected to the spindle seat, one end of the core shaft extending into the brake box is connected to a first brake member, the brake box is connected to a second brake member, and the brake box is connected to a drive assembly for driving the second brake member to move.

[0007] By adopting the above technical solution, the driving assembly can push the second brake member to move toward the first brake member. When the second brake member abuts against the first brake member, since the first brake member rotates with the mandrel, a large friction force is generated between the first brake member and the second brake member, thereby achieving friction braking on the mandrel through the friction force applied by the second brake member to the first brake member. And since the force applied by the second brake member to the first brake member is positive pressure and the contact area is larger, the braking efficiency is higher and more stable.

[0008] In a preferred example, the present invention can be further configured as follows: the first brake member includes a mounting plate fixed to the spindle, and a brake pad is fixedly connected to the side wall of the mounting plate facing the second brake member.

[0009] By adopting the above technical solution, the mounting disk is coaxial with the core shaft, and the mounting disk contains a side wall perpendicular to the axis of the core shaft. The brake pad is fixed on the vertical side wall of the mounting disk. The brake pad is arranged in an annular shape and is coaxial with the core shaft. When the core shaft rotates, the brake pad rotates with the core shaft and forms a relative motion with the second brake component.

[0010] In a preferred example, the present invention can be further configured as follows: the second brake member includes a movable disk that is annularly sleeved outside the core shaft, the longitudinal cross-section of the movable disk is L-shaped, the movable disk includes a first push plate that abuts against the brake pad, the end of the movable disk is fixedly connected to a second push plate, an air chamber is formed between the first push plate and the second push plate, the driving assembly extends into the air chamber and acts alternately on the first push plate and the second push plate.

[0011] By adopting the above technical solution, when the driving component applies force toward the first push plate, it pushes the first push plate to move toward the brake pad and makes the first push plate contact with the brake pad, thereby realizing friction braking of the core shaft. When the brake is released, the driving component applies force toward the second push plate, thereby pushing the first push plate and the second push plate to move in the direction away from the brake pad, thereby separating the first push plate from the brake pad, so that the core shaft is not subject to friction when rotating, and the rotation is smoother.

[0012] In a preferred example, the present invention can be further configured as follows: an annular friction plate is fixedly connected to the side wall of the first push plate facing the brake pad, and the friction plate can abut against the brake pad.

[0013] By adopting the above technical solution, when the first push plate moves toward the brake pad, the friction pad is pressed against the brake pad, and the brake pad rotates synchronously with the core shaft, thereby forming a relative rotation between the brake pad and the friction pad. The friction force between the brake pad and the friction pad realizes braking of the core shaft, thereby achieving a better braking effect.

[0014] In a preferred example, the present invention can be further configured as follows: the drive assembly includes a mounting ring fixed in the brake box and having an inner wall abutting against the first thrust plate and the second thrust plate, the mounting ring is connected to a partition ring extending into the air chamber, the partition ring divides the air chamber into two independent and sealed chambers, the brake box is connected to two air intake pipes, and the two air intake pipes are respectively connected to the two chambers.

[0015] By adopting the above technical scheme, the two air intake pipes alternately ventilate the chamber. When one of the air intake pipes ventilates the chamber, the other air intake pipe exhausts the chamber connected to it, thereby pushing the first push plate and the second push plate to move. At the same time, the volume of the intake chamber becomes larger, and the volume of the exhaust chamber becomes smaller. When the chamber away from the first push plate is inflated, the gas in the chamber close to the first push plate is discharged, and the first push plate is pushed to move in the direction away from the brake pad, thereby making the friction pad and the brake pad in a separated state. When the chamber close to the first push plate is inflated, the gas in the chamber away from the first push plate is discharged, and the first push plate is pushed to move toward the brake pad, thereby making the friction pad contact and rub against the brake pad to achieve braking.

[0016] In a preferred example, the present invention can be further configured as follows: an annular guide groove is formed on the outer side walls of the first push plate and the second push plate, a guide ring is fixedly connected to the inner wall of the mounting ring, and the guide ring is located in the guide groove.

[0017] By adopting the above technical solution, when the first push plate and the second push plate move, the guide groove can move under the limit of the guide ring to achieve the limit of the first push plate and the second push plate.

[0018] In a preferred example, the present invention can be further configured as follows: the cross-sectional shape of the guide ring is a regular hexagon.

[0019] By adopting the above technical solution, the upper and lower sides of the regular hexagonal guide ring are arranged horizontally and in parallel, and the upper and lower sides of the guide ring are tightly attached to the top and bottom surfaces of the guide groove, thereby achieving a sealing effect.

[0020] In a preferred example, the present invention can be further configured as follows: the guide ring is made of rubber.

[0021] By adopting the above technical solution, when the guide ring is located in the guide groove, the guide ring is squeezed and deformed, thereby achieving a better sealing effect of the guide ring.

[0022] In a preferred example, the present invention can be further configured as follows: the movement stroke of the guide ring along the guide groove is equal to the distance from the friction pad to the brake pad.

[0023] By adopting the above technical solution, when the first thrust plate moves along the axial direction of the core shaft and when the friction plate moves to abut against the brake pad, the guide ring and the end face of the guide groove are exactly abutted, thereby preventing the friction plate and the brake pad from being excessively squeezed through the fibers of the guide groove, thereby reducing the risk of damaging the friction plate or the brake pad.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects:

[0025] The driving assembly can push the second brake member to move toward the first brake member. When the second brake member contacts the first brake member, since the first brake member rotates with the mandrel, a large friction force is generated between the second brake member and the mandrel, thereby achieving friction braking on the mandrel through the friction force applied by the second brake member to the first brake member. And since the force applied by the second brake member to the first brake member is positive pressure and the contact area is larger, the braking efficiency is higher and more stable;

[0026] The two air intake pipes alternately ventilate the chamber. When one of the air intake pipes ventilates the chamber, the other air intake pipe exhausts the chamber connected to it, thereby pushing the first push plate and the second push plate to move. At the same time, the volume of the intake chamber increases, and the volume of the exhaust chamber decreases. When the chamber away from the first push plate is inflated, the gas in the chamber close to the first push plate is discharged, and the first push plate is pushed to move in the direction away from the brake pad, thereby making the friction pad and the brake pad in a separated state. When the chamber close to the first push plate is inflated, the gas in the chamber away from the first push plate is discharged, and the first push plate is pushed to move toward the brake pad, thereby making the friction pad contact and rub against the brake pad to achieve braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view structural schematic diagram of the present invention.

[0028] Figure 2 It is a partial structural schematic diagram of the present invention.

[0029] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0030] Figure 4 It is a right-side structural schematic diagram of the present invention.

[0031] In the figure, 1. spindle seat; 2. core shaft; 3. brake mechanism; 4. brake box; 5. first brake member; 6. second brake member; 7. drive assembly; 8. mounting plate; 9. brake pad; 10. movable plate; 11. first push plate; 12. second push plate; 13. air chamber; 14. friction plate; 15. mounting ring; 16. separator ring; 17. chamber; 18. intake pipe; 19. guide groove; 20. guide ring. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figure 1 and Figure 2, a disc brake mechanism for a machine tool spindle disclosed in the present invention, comprising a spindle seat 1, a core shaft 2 rotatably inserted into the spindle seat 1, the core shaft 2 extending backward from the rear end of the spindle seat 1, a brake mechanism 3 fixedly connected to the rear end of the spindle seat 1, the brake mechanism 3 comprising a brake box 4 fixedly connected to the spindle seat 1 by screws, a first brake member 5 connected to one end of the core shaft 2 extending into the brake box 4, a second brake member 6 connected to the brake box 4, a drive assembly 7 for driving the second brake member 6 to move along the axial direction of the core shaft 2, thereby driving the second brake member 6 to approach or move away from the first brake member 5. The drive assembly 7 can push the second brake member 6 to move toward the first brake member 5, and when the second brake member 6 abuts against the first brake member 5, since the first brake member 5 rotates with the core shaft 2, a large friction force is generated between the first brake member 5 and the second brake member 6, thereby achieving friction braking on the core shaft 2 through the friction force applied by the second brake member 6 to the first brake member 5. Furthermore, since the force applied by the second brake member 6 to the first brake member 5 is a positive pressure and the contact area is larger, the braking efficiency is higher and more stable.

[0034] like Figure 2 and Figure 3 As shown, the first brake component 5 includes a mounting plate 8 fixed to the core shaft 2 by screws, and the side wall of the mounting plate 8 facing the second brake component 6 is fixedly connected with a brake pad 9 by screws; the mounting plate 8 is coaxial with the core shaft 2, and the mounting plate 8 contains a side wall perpendicular to the axis of the core shaft 2, and the brake pad 9 is fixed on the vertical side wall of the mounting plate 8. The brake pad 9 is arranged in an annular shape and is coaxial with the core shaft 2, and when the core shaft 2 rotates, the brake pad 9 rotates with the core shaft 2, forming relative motion with the second brake component 6.

[0035] like Figure 2 and Figure 3 As shown, the second brake member 6 includes a movable disk 10 annularly sleeved outside the core shaft 2, the movable disk 10 is not connected to the core shaft 2, the longitudinal section of the movable disk 10 is L-shaped, the movable disk 10 includes a first push disk 11 close to the brake pad 9 and abutting the brake pad 9, the end of the movable disk 10 away from the brake pad 9 is fixedly connected to the second push disk 12, an air chamber 13 is formed between the first push disk 11 and the second push disk 12, the driving component 7 extends into the air chamber 13 and acts alternately on the first push disk 11 and the second push disk When the driving component 7 applies force toward the first push plate 11, the first push plate 11 is pushed to move toward the brake pad 9 and the first push plate 11 contacts the brake pad 9, thereby realizing friction braking of the spindle 2. When the brake is released, the driving component 7 applies force toward the second push plate 12, thereby pushing the first push plate 11 and the second push plate 12 to move in the direction away from the brake pad 9, thereby separating the first push plate 11 from the brake pad 9, so that the spindle 2 is not subject to friction when rotating, and the rotation is smoother.

[0036] An annular friction plate 14 is fixedly connected to the side wall of the first push plate 11 facing the brake pad 9. The surface of the friction plate 14 is rough and can abut against the brake pad 9. When the first push plate 11 moves toward the brake pad 9, the friction plate 14 is pressed tightly against the brake pad 9, and the brake pad 9 rotates synchronously with the core shaft 2, so that relative rotation is formed between the brake pad 9 and the friction plate 14. The braking of the core shaft 2 is achieved through the friction force between the brake pad 9 and the friction plate 14, thereby achieving a better braking effect.

[0037] like Figure 2 and Figure 3 As shown, the drive assembly 7 includes a mounting ring 15 fixed in the brake box 4 and having an inner wall abutting against the first push plate 11 and the second push plate 12. The mounting ring 15 is connected to a separation ring 16 extending into the air chamber 13. The bottom edge of the separation ring 16 seals against the bottom surface of the air chamber 13 and divides the air chamber 13 into two independent and sealed chambers 17. The brake box 4 is connected to two air inlet pipes 18 (indicated at Figure 4 ), the two air inlet pipes 18 are respectively connected to the two chambers 17, and the two air inlet pipes 18 are connected to an air source; the two air inlet pipes 18 alternately ventilate the chamber 17, when one of the air inlet pipes 18 ventilates the chamber 17, the other air inlet pipe 18 exhausts the chamber 17 connected thereto, thereby pushing the first push plate 11 and the second push plate 12 to move, and at the same time, the volume of the chamber 17 for air intake becomes larger, and the volume of the chamber 17 for exhaust becomes smaller. When moving away from the first push plate 11, the second push plate 12 moves away from the first push plate 11. When the chamber 17 is inflated, the gas in the chamber 17 close to the first push plate 11 is discharged, and the first push plate 11 is pushed to move in the direction away from the brake pad 9, so that the friction plate 14 and the brake pad 9 are in a separated state. When the chamber 17 close to the first push plate 11 is inflated, the gas in the chamber 17 away from the first push plate 11 is discharged, and the first push plate 11 is pushed to move toward the brake pad 9, so that the friction plate 14 and the brake pad 9 are in contact and rubbed, thereby achieving braking.

[0038] like Figure 2 and Figure 3 As shown, the outer wall of the first push plate 11 and the second push plate 12 is provided with an annular guide groove 19, and the inner wall of the mounting ring 15 is fixedly connected with a guide ring 20, and the guide ring 20 is located in the guide groove 19; when the first push plate 11 and the second push plate 12 move, the guide groove 19 can move under the limit of the guide ring 20, so as to limit the first push plate 11 and the second push plate 12. The cross-sectional shape of the guide ring 20 is a regular hexagon, and the upper and lower sides of the regular hexagonal guide ring 20 are horizontal and parallel, and the upper and lower sides of the guide ring 20 are tightly attached to the top and bottom surfaces of the guide groove 19, and a sealing effect is achieved at the same time. The guide ring 20 is made of rubber; therefore, when the guide ring 20 is located in the guide groove 19, the guide ring 20 is squeezed and deformed, so that the sealing effect of the guide ring 20 is better.

[0039] The moving stroke of the guide ring 20 along the guide groove 19 is equal to the distance from the friction plate 14 to the brake pad 9; thus, when the first thrust plate 11 moves along the axial direction of the core shaft 2, when the friction plate 14 moves to abut against the brake pad 9, the guide ring 20 and the end face of the guide groove 19 are just abutted, thereby preventing the friction plate 14 and the brake pad 9 from being excessively squeezed through the fibers of the guide groove 19, thereby reducing the risk of damaging the friction plate 14 or the brake pad 9.

[0040] The implementation principle of this embodiment is: when the core shaft 2 is in a rotating state, air is ventilated into the cavity away from the first push plate 11 through the air inlet pipe 18, and at the same time, the air is exhausted outward from the cavity close to the first push plate 11, and the air pressure pushes the first push plate 11 to move in the direction away from the brake pad 9, thereby separating the friction plate 14 from the brake pad 9. When braking is required, the chamber 17 away from the first push plate 11 is exhausted, and the chamber 17 close to the first push plate 11 is inflated, and the first push plate 11 is driven to move toward the brake pad 9 until the friction plate 14 contacts the brake pad 9. At this time, the brake pad 9 rotates synchronously with the core shaft 2, and the braking of the core shaft 2 is achieved by the friction force between the friction plate 14 and the brake pad 9.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A disc brake mechanism for a machine tool spindle, comprising a spindle seat (1), and a core shaft (2) rotatably disposed in the spindle seat (1), characterized in that: The spindle (2) extends backwards out of the rear end of the spindle seat (1); the rear end of the spindle seat (1) is connected to a brake mechanism (3); the brake mechanism (3) comprises a brake box (4) connected to the spindle seat (1); one end of the spindle (2) extending into the brake box (4) is connected to a first brake member (5); the brake box (4) is connected to a second brake member (6); the brake box (4) is connected to a drive assembly (7) for driving the second brake member (6) to move; the first brake member (5) comprises a mounting plate (8) fixed to the spindle (2); the mounting plate (8) faces the second brake member (6) The side wall of the second brake member (6) is fixedly connected with a brake pad (9); the second brake member (6) comprises a movable disk (10) which is annularly sleeved outside the core shaft (2); the longitudinal section of the movable disk (10) is L-shaped; the movable disk (10) comprises a first push disk (11) abutting against the brake pad (9); the end of the movable disk (10) is fixedly connected with a second push disk (12); an air chamber (13) is formed between the first push disk (11) and the second push disk (12); the driving component (7) extends into the air chamber (13) and acts alternately on the first push disk (11) and the second push disk (12).

2. A machine tool spindle disc brake mechanism according to claim 1, characterized in that: An annular friction plate (14) is fixedly connected to the side wall of the first push plate (11) facing the brake pad (9), and the friction plate (14) can abut against the brake pad (9).

3. The machine tool spindle disc brake mechanism according to claim 1, characterized in that: The driving assembly (7) comprises a mounting ring (15) fixed in a brake box (4) and having an inner wall abutting against a first thrust plate (11) and a second thrust plate (12); the mounting ring (15) is connected to a separating ring (16) extending into an air chamber (13); the separating ring (16) divides the air chamber (13) into two independent and sealed chambers (17); the brake box (4) is connected to two air intake pipes (18); the two air intake pipes (18) are respectively connected to the two chambers (17).

4. The machine tool spindle disc brake mechanism according to claim 3, characterized in that: The outer side walls of the first push plate (11) and the second push plate (12) are provided with an annular guide groove (19), and the inner wall of the mounting ring (15) is fixedly connected with a guide ring (20), and the guide ring (20) is located in the guide groove (19).

5. The machine tool spindle disc brake mechanism according to claim 4, characterized in that: The cross-sectional shape of the guide ring (20) is a regular hexagon.

6. The machine tool spindle disc brake mechanism according to claim 4, characterized in that: The guide ring (20) is made of rubber.

7. The machine tool spindle disc brake mechanism according to claim 4, characterized in that: The moving stroke of the guide ring (20) along the guide groove (19) is equal to the distance from the friction plate (14) to the brake plate (9).

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