Brake pad and rotary table brake mechanism

Abstract

The brake pad comprises a circular-ring-shaped brake pad body, the brake pad body comprises a circular-ring-shaped brake part, the brake pad body is an integrated stainless steel sheet, the tensile strength of the stainless steel sheet ranges from 520 MPa to 760 MPa, the yield strength of the stainless steel sheet is larger than or equal to 245 MPa, the percentage elongation after fracture of the stainless steel sheet is larger than or equal to 18%, and the hardness of the stainless steel sheet is smaller than or equal to 223 HB; the surface of the circular-ring-shaped brake part is provided with a sand blasting treatment structure, and the surface smoothness of the sand blasting treatment structure is Ra 3.0-4.0. The brake pad has the advantages that wear resistance and high strength are met, high flexibility is achieved, adaptive deformation can be generated, counter-acting force generated by a brake clamp during braking is eliminated, and the counter-acting force is prevented from jacking up a rotary table to generate an inclination angle, and machining precision is affected. The invention further discloses a rotary table brake mechanism adopting the brake pad.

Description

Technical Field

[0001] This invention relates to equipment turntable braking technology, and particularly to a brake pad and a turntable braking mechanism. Background Technology

[0002] The brake pads in turntable braking mechanisms are generally made of hard cast iron, which are thick, hard, and rigid. Combined with upper and lower clamping brake calipers, they can achieve instantaneous stopping. While these traditional turntable brake pads are generally sufficient for turntables with lower load-bearing capacities, they still have drawbacks such as easy wear, space consumption, and susceptibility to oil contamination. Furthermore, when used in large, high-load-bearing turntables, traditional brake pads are insufficient to meet the requirements of high precision and high locking force. When braking a turntable, brake pads need to be clamped tightly by brake calipers to bring the turntable to an instantaneous stop and prevent movement of the braking position. Under hydraulic pressure, the impact clamping force of the brake calipers on the brake pads is enormous. If traditional hard cast iron brake pads are used, due to their high hardness and rigidity, if the flatness of the hard cast iron brake pads or brake pads is insufficient or they deform during use, the reaction force of the brake calipers clamping the brake pads may lift the turntable, causing it to tilt. Although the tilt angle is very small, the diameter of large turntables is very large, and even a small tilt can have a significant impact on machining accuracy. Therefore, if traditional hard cast iron brake pads are used in the braking mechanism of large, high-load-bearing turntables, the high flatness requirements and susceptibility to casting deformation will result in a short lifespan and high maintenance costs for the braking mechanism. Moreover, the reaction force generated by braking can also seriously affect the production and machining accuracy. Summary of the Invention

[0003] To address the aforementioned shortcomings, the present invention aims to provide a brake pad that, while satisfying the requirements of wear resistance and high strength, also possesses exceptional flexibility, enabling adaptive deformation. This eliminates the reaction force generated by the brake caliper during braking, preventing the reaction force from lifting the turntable and causing a tilt angle that would affect machining accuracy. The present invention also aims to provide a turntable braking mechanism employing the aforementioned brake pad.

[0004] The technical solution adopted in this invention is as follows: a brake pad, comprising an annular brake pad body, wherein the brake pad body includes an annular brake portion, the brake pad body being an integral stainless steel sheet, the stainless steel having a tensile strength between 520 and 760 MPa, a yield strength ≥ 245 MPa, an elongation after fracture ≥ 18%, and a hardness ≤ 223 HB; the surface of the annular brake portion has a sandblasted structure, the surface finish of which is Ra3.0 to 4.0.

[0005] Preferably, the thickness of the brake pad body is 1~3mm.

[0006] Preferably, the brake pad body further includes an annular mounting and fixing part, wherein the annular mounting and fixing part is provided with a plurality of mounting holes evenly distributed around its circumference.

[0007] Preferably, it also includes a first brake pad and a second brake pad in the shape of an annulus. The first brake pad and the second brake pad are provided with a plurality of mounting holes evenly distributed around their circumference. The first brake pad and the second brake pad are respectively disposed on the upper and lower sides of the annulus mounting and fixing part, thereby clamping and fixing the annulus mounting and fixing part of the brake pad.

[0008] Preferably, the stainless steel material is 20Cr13.

[0009] The turntable braking mechanism using the aforementioned brake pads includes brake pads and brake calipers. The brake pads are fixedly mounted on a turntable base or rotating platform, and the brake calipers are mounted on the rotating platform or turntable base. The upper brake caliper and lower brake caliper of the brake caliper correspond to the upper and lower surfaces and the lower surface of the annular brake portion of the brake pads, respectively.

[0010] Preferably, the turntable base or rotating platform is provided with an annular stepped portion, and the annular stepped portion is provided with multiple screw holes evenly arranged around its circumference, so as to lock and fix the stacked first brake pad, the annular mounting and fixing portion of the brake pad body, and the second brake pad by multiple screws, thereby realizing the installation and fixing of the brake pad.

[0011] The present invention has the following advantages: The ring-shaped (disc-shaped) stainless steel brake pads meet the requirements of wear resistance and high strength, while also possessing excellent flexibility. The approximately 2.0mm thick stainless steel sheet undergoes adaptive deformation when locked by the brake caliper, effectively acting as a buffer to eliminate the reaction force generated by the brake caliper during braking (instantaneous clamping and impact on the brake pads). This prevents the reaction force from lifting the turntable and causing a tilt angle, which would affect the machining accuracy.

[0012] The flexibility of stainless steel brake pads means that the requirements for mechanical installation and processing are relatively low compared to mechanical installation and precision indicators. When the hydraulic brake clamp repeatedly clamps and locks the brake pads during the repeated movement of the turntable, it will continuously impact the brake pads. Over time and with repeated impacts, this will affect the shape, flatness, and assembly precision of the brake pads. The flexibility of stainless steel disc brake pads can effectively buffer the impact, providing good protection for the worktable, preventing casting deformation, and further eliminating the force generated by braking.

[0013] Stainless steel brake pads have a very smooth surface, and are easily affected by oil contaminants generated during processing. This can cause a positional shift of approximately 0.016mm during heavy cutting operations on a rotary table. Therefore, a sandblasted surface treatment on the annular brake pad not only increases the adhesion of the braking mechanism but also reduces the slippage caused by oil contaminants. After the brake is locked, the positional shift during heavy cutting operations is approximately 0.002mm, ensuring braking accuracy.

[0014] Using these stainless steel brake pads, the cost of the rotary table braking mechanism is reduced by 200% compared to the braking mechanism using cast iron brake pads. It also offers higher precision, greater stability, longer service life, and lower maintenance costs.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a brake pad; Figure 2 This is a schematic diagram of the structure of the first brake pad; Figure 3 This is a schematic diagram of the structure of the second brake pad; Figure 4 This is a structural view of the turntable braking mechanism; Figure 5 for Figure 4 Enlarged schematic diagram of the mating structure between the brake caliper and the brake pads; In the figure: brake pad body 1; first brake pad 2; second brake pad 3; brake caliper 4; upper brake caliper 41; lower brake caliper 42; turntable base 5; rotating platform 6; annular stepped section 7. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0020] See Figures 1 to 5 The brake pad provided in this embodiment includes an annular brake pad body 1, which includes an annular brake portion. The brake pad body 1 is an integral stainless steel sheet with a thickness of 1-3 mm. The stainless steel has a tensile strength between 520-760 MPa, a yield strength ≥245 MPa, an elongation after fracture ≥18%, and a hardness ≤223 HB. The surface of the annular brake portion has a sandblasted structure with a surface finish of Ra3.0-4.0.

[0021] Specifically, the brake pad body also includes an annular mounting and fixing part, and the annular mounting and fixing part is provided with a plurality of mounting holes evenly distributed around its circumference.

[0022] The brake pads in this embodiment are made of stainless steel sheets with a thickness of 2±0.1mm, an inner diameter of 1102±1mm, and an outer diameter of 1350±1mm; the mounting holes have a diameter of 1120±0.1mm and there are a total of 36 through mounting holes with a diameter of 7mm.

[0023] Specifically, it also includes a first brake pad 2 and a second brake pad 3 in the shape of a ring. The first brake pad and the second brake pad are evenly provided with multiple mounting holes around their circumference. The first brake pad and the second brake pad are respectively arranged on the upper and lower sides of the ring-shaped mounting and fixing part, so as to clamp and fix the ring-shaped mounting and fixing part of the brake pad.

[0024] In this embodiment, the first brake pad is a metal pad with a thickness of 11±0.1mm, an inner diameter of 1102mm, and an outer diameter of 1150mm; wherein the diameter of the mounting holes is 1120mm, and there are a total of 36 through mounting holes with a diameter of 7mm. Alternatively, the first brake pad may be a metal pad with a thickness of 8.5±0.1mm, an inner diameter of 1102mm, and an outer diameter of 1150mm; wherein the diameter of the mounting holes is 1120mm, and there are a total of 36 through mounting holes with a diameter of 7mm.

[0025] Specifically, the stainless steel material is 20Cr13 (national standard 20Cr13, formerly known as 2Cr13). Of course, other similar stainless steel materials that meet the performance requirements of "tensile strength between 520 and 760 MPa, yield strength ≥ 245 MPa, elongation after fracture ≥ 18%, and hardness ≤ 223 HB" are also suitable for this brake pad.

[0026] It is important to note that during the research and application of large-scale equipment turntables, the inventors discovered that the load-bearing capacity of large processing equipment turntables is several levels higher than that of small equipment. Using traditional cast brake pads results in a short lifespan and difficulty in maintenance, leading to high costs and compromised processing accuracy. The core reason is that if the cast brake pads deform or the brake surface is not flat enough, the reaction force of the hydraulic brake clamp may lift the turntable, causing it to tilt. Although the tilt angle is very small, the large diameter of large turntables means that even a slight tilt can significantly impact processing accuracy. Furthermore, the repeated clamping and locking of the brake pads by the hydraulic brake clamp during the turntable's movement continuously impacts the cast brake pads. Over time and with repeated impacts, this affects the shape, flatness, and assembly accuracy of the cast brake pads. Once the casting is deformed, its flatness is damaged, or its assembly accuracy is reduced, processing accuracy will be affected, requiring repair or even replacement of the cast brake pads. To address this issue, the inventors, in their search for solutions, experimented with using stainless steel, a material known for its wear resistance, high strength, and exceptional flexibility, as brake pads. Based on experimental parameters, they continuously adjusted the specific performance parameters, thickness, and surface treatment of the stainless steel material. This allowed them to fully utilize its wear resistance and high strength while cleverly leveraging its flexibility. The approximately 2.0mm thick stainless steel sheet undergoes adaptive deformation when locked in place by the brake caliper, effectively buffering the impact and eliminating the reaction force generated by the brake caliper during braking. This prevents the reaction force from lifting the turntable and causing tilting, which would affect machining accuracy. Furthermore, the flexibility of the stainless steel brake pads significantly reduces the requirements for mechanical installation and machining accuracy. Even with repeated locking impacts from the hydraulic brake caliper, the flexibility of the stainless steel disc brake pads effectively buffers the impact, providing excellent protection for the worktable. This avoids the issues of deformation, flatness damage, or reduced assembly precision that can occur with traditional cast brake pads, which would otherwise affect machining accuracy. Furthermore, during the research and development process, the inventors discovered that the surface of stainless steel brake pads is too smooth, and coupled with the susceptibility to oil contamination generated during processing, the brakes experienced a positional shift of approximately 0.016 mm during heavy cutting operations on the turntable. Therefore, the use of sandblasting to treat the surface of the annular brake pad not only increases the adhesion of the braking mechanism but also reduces the slippage caused by oil contamination. After the brake is locked, the positional shift during heavy cutting operations is approximately 0.002 mm, ensuring braking accuracy.

[0027] See Figures 1 to 5The turntable braking mechanism using the aforementioned brake pads includes brake pads 1 and brake calipers 4. The brake pads 1 are fixedly mounted on the turntable base 5 or the rotating platform 6. The brake calipers are mounted on the rotating platform 6 or the turntable base 5. The upper brake caliper 41 and the lower brake caliper 42 of the brake caliper 4 correspond to the upper and lower surfaces and the lower surface of the annular brake part of the brake pads 1, respectively.

[0028] It should be noted that the brake pads and brake calipers are in a corresponding relationship. The brake pads can be fixed to the turntable base, while the brake calipers are mounted on the rotating platform. Conversely, it is also feasible to fix the brake pads to the rotating platform and the brake calipers to the turntable base. Regarding the number of turntable braking mechanisms, more than one set can be installed. If there are two sets, they should be arranged symmetrically around the circumference; if there are three or more sets, they should be evenly distributed around the circumference.

[0029] Specifically, the turntable base or rotating platform is provided with an annular stepped portion 7, and the annular stepped portion is evenly provided with multiple screw holes around its circumference, so as to lock and fix the stacked first brake pad, the annular mounting and fixing portion of the brake pad body, and the second brake pad by multiple screws, thereby realizing the installation and fixing of the brake pad.

[0030] It is important to note that the installation and fixing of stainless steel brake pads is a critical issue. Because of their thinness and lightness, and the fact that the annular brake pads undergo repeated impacts during braking, requiring adaptive cushioning and deformation, their flexibility reduces the need for precise dimensional machining and mechanical installation. However, the stability of the installation and fixing is paramount. Therefore, a first and second brake pad are designed for vertical clamping and fixing, ensuring stability in the vertical direction. A stepped annular section is also designed for horizontal stability. Finally, multiple evenly spaced screw holes around the circumference are used for locking, ensuring safety, reliability, and long service life. Furthermore, this fixing structure for stainless steel brake pads can easily accommodate various thicknesses, even multiple stainless steel brake pads (e.g., two or three 1mm thin pads) can be stacked and fixed. The stainless steel brake pads can be adapted to the load capacity of the turntable.

[0031] This invention is not limited to the above-described embodiments. Any other brake pad and turntable brake mechanism obtained by using the same or similar technical features as the above-described embodiments of this invention are within the protection scope of this invention.

Claims

1. A brake pad, comprising an annular brake pad body, wherein the brake pad body includes an annular brake portion, characterized in that: The brake pad body is a one-piece stainless steel sheet with a tensile strength of 520~760MPa, a yield strength of ≥245MPa, an elongation after fracture of ≥18%, and a hardness of ≤223HB. The surface of the annular brake part has a sandblasted structure with a surface finish of Ra3.0~4.

0.

2. The brake pad according to claim 1, characterized in that: The thickness of the brake pad body is 1~3mm.

3. The brake pad according to claim 1, characterized in that: The brake pad body also includes an annular mounting and fixing part, and the annular mounting and fixing part is provided with a plurality of mounting holes evenly distributed around its circumference.

4. The brake pad according to claim 3, characterized in that: It also includes a first and a second brake pad in the shape of a ring. The first and second brake pads are provided with a plurality of mounting holes evenly distributed around their circumference. The first and second brake pads are respectively disposed on the upper and lower sides of the ring-shaped mounting and fixing part, thereby clamping and fixing the ring-shaped mounting and fixing part of the brake pad.

5. The brake pad according to claim 1, characterized in that: The stainless steel material is 20Cr13.

6. A turntable braking mechanism employing the brake pads described in any one of claims 1 to 5, characterized in that: The device includes brake pads and a brake caliper. The brake pads are fixedly mounted on a turntable base or a rotating platform, and the brake caliper is mounted on the rotating platform or the turntable base. The upper brake caliper and the lower brake caliper of the brake caliper correspond to the upper and lower surfaces and the lower surface of the annular brake part of the brake pad, respectively.

7. The turntable braking mechanism according to claim 6, characterized in that: The turntable base or rotating platform is provided with an annular stepped portion, and the annular stepped portion is evenly provided with multiple screw holes around its circumference. The first brake pad, the annular mounting and fixing portion of the brake pad body, and the second brake pad are locked and fixed by multiple screws, thereby realizing the installation and fixing of the brake pad.

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