A hub type brake cradle rotary table

Abstract

The application relates to a hub type brake cradle rotary table and relates to the technical field of cradle rotary tables, which comprises a shell, a plurality of motors are arranged in the shell, the motor comprises a stator and a rotor, the stator is fixed with the shell, the shell is rotationally connected with the rotor through a bearing one, the outer ring of the bearing one is fixed with the shell, the inner ring of the bearing one is fixed with a workbench, the shell is fixed with a supporting cylinder, the supporting cylinder is located on the inner side of the rotor, the outer side of the supporting cylinder is assembled with a copper brake hub through a sealing ring, a hydraulic cavity is arranged between the inner side wall of the brake hub and the outer side wall of the supporting cylinder, the inner side wall of the rotor is provided with a brake surface, and the outer side wall of the brake hub is gap matched with the brake surface. The application is provided with the structure of the hub type brake, compared with the mode of the brake pad type axial brake, axial force is not generated during braking, the burden of the bearing is not increased, and the position of the workbench surface is not caused to shift; compared with the brake pad, the brake contact area is greatly increased, the braking effect is improved, and the brake performance is improved.

Description

Technical Field

[0001] This application relates to the field of cradle turntable technology, and in particular to a hub-type brake cradle turntable. Background Technology

[0002] A cradle turntable is a device with multiple drive motors used to achieve multi-degree-of-freedom motion control, including rotational motion around multiple axes. In many applications, rapid and precise stopping and locking of the turntable is required during operation to ensure accurate positioning and safety of the workpiece or equipment. Traditional braking systems use brake pads, employing hydraulic or electromagnetic brakes to achieve the stopping function.

[0003] A utility model patent with publication number CN222668750U discloses a braking system for a direct-drive five-axis cradle turntable, including a drive shaft, a brake cover, brake pads, a brake piston, a turntable bearing, and a water jacket. The drive shaft is mounted in the water jacket via the turntable bearing. A brake surface is provided radially on the drive shaft. The brake pads are mounted on one side of the brake surface. The water jacket has a pressure chamber connected to external oil corresponding to the brake surface. The brake piston is located in the pressure chamber. The brake cover is mounted on the end face of the water jacket and contacts both the brake pads and the brake piston. The brake piston pushes the brake cover away from the brake pads.

[0004] Regarding the aforementioned technologies, when brake pads are used for braking, the brake pads inevitably experience axial force. This force acts on the rotating connection parts of the rotor through the structure, increasing the burden on the bearings. Due to the existence of assembly gaps, the position of the worktable may also shift, affecting the positioning accuracy. Furthermore, the braking area on the brake pads is not large enough, and the braking performance needs to be improved. Utility Model Content

[0005] This application provides a hub-type brake cradle turntable that does not generate axial force during braking, does not increase the burden on the bearings, and does not cause the worktable surface to shift. Compared with brake pads, it significantly increases the brake contact area and improves braking performance.

[0006] This application provides a hub-type brake cradle turntable, which adopts the following technical solution:

[0007] A hub-type brake cradle turntable includes a housing, within which are disposed a plurality of motors, each motor comprising a stator and a rotor. The stator is fixed to the housing, and the housing and rotor are rotatably connected via a bearing. The outer ring of the bearing is fixed to the housing, and a worktable is fixed to the inner ring of the bearing. A support cylinder is fixed to the housing, located inside the rotor. A copper brake hub is fitted to the outer side of the support cylinder via a sealing ring. A hydraulic cavity is provided between the inner wall of the brake hub and the outer wall of the support cylinder. A brake surface is provided on the inner wall of the rotor, and the outer wall of the brake hub is clearance-fitted with the brake surface.

[0008] By employing the above technical solution, a copper brake drum is used. Copper is less hard than iron, making it easier to undergo elastic deformation under strong force. Hydraulic oil is introduced into the hydraulic chamber through a hydraulic system. As the amount of hydraulic oil increases, the center of the brake drum undergoes outward elastic deformation, causing the outer wall of the brake drum to press against the brake surface. The brake drum then uses friction to stop the rotor, thus achieving a drum brake.

[0009] Optionally, the gap between the outer wall of the brake drum and the brake surface is 0.5-0.7 mm.

[0010] By adopting the above technical solution, within this spacing range, the brake hub does not contact the brake surface when the rotor is rotating normally. When braking is required, the brake hub can overcome the spacing through expansion deformation, and the outer wall of the brake hub contacts the brake surface to perform braking.

[0011] Optionally, the end of the brake hub is provided with a plurality of bolt holes, which are used to insert bolts to fix the end of the brake hub to the support cylinder.

[0012] By adopting the above technical solution, the end of the brake drum is fixed to the support cylinder with bolts, thus preventing the brake drum from rotating with the rotor.

[0013] Optionally, the inner wall of the brake hub and the outer wall of the support cylinder are both provided with annular grooves, and the two annular grooves are combined to form the shape of a hydraulic chamber.

[0014] By adopting the above technical solution, the thickness of the corresponding position of the brake drum is reduced through the annular groove of the brake drum, making it easier for the middle part of the brake drum to generate outward expansion deformation. The width of the hydraulic chamber is increased through the annular groove of the support cylinder, which facilitates the rapid flow of hydraulic oil to build up pressure.

[0015] Optionally, the bearing has three sets of rollers, which respectively contact the two end faces of the outer ring and the inner ring wall of the bearing.

[0016] By adopting the above technical solution, a special bearing structure is formed by three sets of rollers, which improves the rotational stability and load-bearing capacity of the rotor.

[0017] Optionally, the rotor and the support cylinder are rotatably connected by a bearing.

[0018] By adopting the above technical solution, the rotational connection points of the rotor are increased, thereby improving the stability of rotor rotation.

[0019] Optionally, the housing is fixed with a central shaft, which is located at the center inside the support cylinder, and the central shaft has a central hole through it.

[0020] By adopting the above technical solution, the central shaft does not rotate, and the central hole can be used as a housing for positioning and installation.

[0021] Optionally, the worktable has a second central hole at its center, and the diameter of the second central hole is larger than that of the first central hole.

[0022] By adopting the above technical solution, processing devices and various pipelines can also be installed in the first central hole. The processing devices and various pipelines pass through the second central hole to the top surface of the worktable, playing a processing or other auxiliary function, thus improving the flexibility of adaptation.

[0023] Optionally, the end of the support cylinder near the worktable is fixed to the central shaft.

[0024] By adopting the above technical solution, one end of the support cylinder is fixed to the central axis and the other end is fixed to the shell. Both the upper and lower ends of the support cylinder are stably supported, thus avoiding deformation of the support cylinder.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Due to the structure of the hub brake, compared with the axial braking method of the brake pad, no axial force is generated during braking, the bearing burden is not increased, and the position of the worktable does not shift.

[0027] 2. Compared with brake pads, it significantly increases the brake contact area, improves braking effect, and enhances braking performance. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of a hub-type brake cradle turntable according to an embodiment.

[0029] Figure 2 yes Figure 1 A magnified view of the middle section;

[0030] Figure 3 This is an exploded view of a portion of the structure of an embodiment.

[0031] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Motor; 21. Stator; 22. Rotor; 3. Bearing 1; 11. Worktable; 4. Support cylinder; 41. Sealing ring; 5. Brake hub; 51. Hydraulic chamber; 52. Hydraulic channel; 23. Brake surface; 53. Bolt hole; 24. Bearing 2; 6. Central shaft; 61. Central hole 1; 12. Central hole 2. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1 and Figure 2 This embodiment discloses a hub-type brake cradle turntable, including a housing 1. Several motors 2 are housed within the housing 1. This embodiment focuses on the motor 2 located at the base of the housing 1. The motor 2 includes a stator 21 and a rotor 22. The stator 21 is fixed to the housing 1. The housing 1 and the rotor 22 are rotatably connected via a bearing 3. The outer ring of the bearing 3 is fixed to the housing 1, and the inner ring of the bearing 3 is fixed to the rotor 22. A worktable 11 is fixed to the inner ring of the bearing 3, and a clamp is used to fix the workpiece onto the worktable 11. In this embodiment, the motor 2 does not have a traditional shaft structure; the rotor 22 is a hollow cylindrical structure. The rotation of the rotor 22 directly drives the worktable 11 to rotate through the inner ring of the bearing 3.

[0034] Reference Figure 2 and Figure 3 The housing 1 is fixed with a support cylinder 4, which is located inside the rotor 22. A copper brake hub 5 is assembled on the outer side of the support cylinder 4 via a sealing ring 41. The brake hub 5 is preferably made of copper alloy. A hydraulic cavity 51 is provided between the inner wall of the brake hub 5 and the outer wall of the support cylinder 4. Two sealing rings 41 are provided, located on the upper and lower sides of the hydraulic cavity 51 respectively, thereby sealing the hydraulic cavity 51. After assembly, the sealing rings 41 are in a flattened state. The support cylinder 4 is provided with a hydraulic channel 52 communicating with the hydraulic cavity 51. The inner wall of the rotor 22 is provided with a brake surface 23, and the outer wall of the brake hub 5 is clearance-fitted with the brake surface 23.

[0035] The gap between the outer wall of the brake hub 5 and the brake surface 23 is 0.5-0.7mm, preferably 0.6mm. Within this gap range, the brake hub 5 does not contact the brake surface 23 when the rotor 22 rotates normally. When braking is required, the brake hub 5 can overcome the gap through expansion deformation, and the outer wall of the brake hub 5 contacts the brake surface 23 to perform braking.

[0036] The brake hub 5 has multiple bolt holes 53 at its end, which are used to insert bolts to fix the end of the brake hub 5 to the support cylinder 4. After the end of the brake hub 5 is fixed to the support cylinder 4, the brake hub 5 is prevented from rotating with the rotor 22, providing a reliable braking effect. Moreover, fixing the end does not affect the expansion deformation of the middle part of the brake hub 5. After the hydraulic chamber 51 is filled with hydraulic oil, the middle part of the brake hub 5 can still expand and deform.

[0037] Both the inner wall of the brake drum 5 and the outer wall of the support cylinder 4 are provided with annular grooves, and the two annular grooves combine to form the shape of the hydraulic chamber 51. The annular grooves of the brake drum 5 reduce the thickness of the corresponding position of the brake drum 5, making it easier for the middle part of the brake drum 5 to undergo outward expansion deformation. The annular grooves of the support cylinder 4 increase the width of the hydraulic chamber 51, facilitating the rapid flow of hydraulic oil to build up pressure.

[0038] Bearing 3 has three sets of rollers, which contact the two end faces of the outer ring and the inner ring wall of bearing 3, respectively. The rollers located at the two end faces of the outer ring of bearing 3 form a thrust bearing structure, which reliably limits the axial movement of rotor 22 and can withstand large axial thrust. The rollers located on the inner ring wall of the outer ring of bearing 3 are used to withstand radial force, stabilizing the rotation axis of rotor 22. The specially designed bearing 3 structure formed by the three sets of rollers improves the rotational stability and load-bearing capacity of rotor 22.

[0039] The rotor 22 is rotatably connected to the support cylinder 4 by a bearing 24. The bearing 24 increases the rotatable connection of the rotor 22 and improves the stability of the rotor 22 rotation.

[0040] A central shaft 6 is fixed to the housing 1, located at the center of the support cylinder 4. The central shaft 6 has a through-hole 61, and a second central hole 12 is formed at the center of the worktable 11. The diameter of the second central hole 12 is larger than that of the first central hole 61. In this embodiment, the central shaft 6 does not rotate. The first central hole 61 serves as a positioning and mounting point for the housing 1. Processing devices and various pipelines can also be installed in the first central hole 61. The processing devices and various pipelines pass through the second central hole 12 to the top surface of the worktable 11, providing processing or other auxiliary functions and improving adaptability. The end of the support cylinder 4 near the worktable 11 is fixed to the central shaft 6, ensuring stable support at both ends of the support cylinder 4 and preventing deformation.

[0041] The implementation principle of a hub-type brake cradle turntable according to an embodiment of this application is as follows: When braking is required, the power supply to the motor 2 is disconnected, and hydraulic oil is simultaneously input into the hydraulic chamber 51 through the hydraulic system. As the hydraulic oil increases, the center of the brake hub 5 undergoes outward elastic deformation, causing the outer wall of the brake hub 5 to press against the brake surface 23. Since the brake hub 5 cannot rotate, it stops the rotor 22 through friction. After the hydraulic chamber 51 is depressurized, the brake hub 5 resets under its own elastic force, and the outer wall of the brake hub 5 returns to a state of non-contact with the brake surface 23.

[0042] The further principle of realizing hub brakes is as follows: First, the brake hub 5 is made of copper. Copper is less hard than iron, so it is easy to produce elastic deformation under strong force. Second, the strong hydraulic pressure after the hydraulic oil is introduced into the hydraulic chamber 51 causes the middle part of the brake hub 5 to expand outward, which is elastic deformation. Finally, the gap between the outer wall of the brake hub 5 and the brake surface 23 is set. By setting a small gap, the brake hub 5 can achieve the braking effect after a small amount of outward expansion deformation, and the sealing ring 41 can still seal the hydraulic chamber 51.

[0043] In summary, this application, through the structure of the hub brake, compared with the brake pad axial braking method, does not generate axial force during braking, does not increase the burden on the bearing, and does not cause the position of the worktable 11 surface to move; compared with brake pads, it significantly increases the braking contact area, improves the braking effect, and improves braking performance.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hub-type brake cradle turntable, comprising a housing (1), wherein a plurality of motors (2) are disposed within the housing (1), characterized in that: The motor (2) includes a stator (21) and a rotor (22). The stator (21) is fixed to the housing (1). The housing (1) and the rotor (22) are rotatably connected by a bearing (3). The outer ring of the bearing (3) is fixed to the housing (1). A worktable (11) is fixed to the inner ring of the bearing (3). A support cylinder (4) is fixed to the housing (1). The support cylinder (4) is located inside the rotor (22). A copper brake hub (5) is assembled on the outer side of the support cylinder (4) through a sealing ring (41). A hydraulic cavity (51) is provided between the inner wall of the brake hub (5) and the outer wall of the support cylinder (4). A brake surface (23) is provided on the inner wall of the rotor (22). The outer wall of the brake hub (5) is clearance-fitted with the brake surface (23).

2. The hub-type brake cradle turntable according to claim 1, characterized in that: The gap between the outer wall of the brake hub (5) and the brake surface (23) is 0.5-0.7 mm.

3. The hub-type brake cradle turntable according to claim 1, characterized in that: The brake hub (5) has multiple bolt holes (53) at its end, which are used to insert bolts to fix the end of the brake hub (5) to the support cylinder (4).

4. The hub-type brake cradle turntable according to claim 1, characterized in that: The inner wall of the brake hub (5) and the outer wall of the support cylinder (4) are both provided with annular grooves, and the two annular grooves are combined to form the shape of the hydraulic chamber (51).

5. The hub-type brake cradle turntable according to claim 1, characterized in that: The bearing (3) is provided with three sets of rollers, which respectively contact the two end faces of the outer ring and the inner ring wall of the bearing (3).

6. The hub-type brake cradle turntable according to claim 1, characterized in that: The rotor (22) and the support cylinder (4) are rotatably connected by bearing two (24).

7. The hub-type brake cradle turntable according to claim 1, characterized in that: The housing (1) is fixed with a central shaft (6), which is located at the center inside the support cylinder (4), and the central shaft (6) has a central hole (61) through it.

8. A hub-type brake cradle turntable according to claim 7, characterized in that: The workbench (11) has a central hole two (12) at its center, and the diameter of the central hole two (12) is larger than that of the central hole one (61).

9. A hub-type brake cradle turntable according to claim 7, characterized in that: The end of the support cylinder (4) near the worktable (11) is fixed to the central shaft (6).

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