Self-adaptive floating structure of upper disc of vertical steel ball grinding machine

Abstract

The application discloses an adaptive floating structure of an upper disc of a vertical steel ball grinding machine, which comprises a base, a door-shaped frame fixedly arranged on the base, and an upper grinding disc arranged in the door-shaped frame and suspended on a cross beam of the door-shaped frame through a lifting assembly; the lifting assembly comprises a vertical lead screw, the upper end of the lead screw is arranged through the cross beam and rotationally matched with the cross beam; a lead screw nut is rotationally arranged on the lead screw, and the lead screw nut is fixedly connected with the upper grinding disc through a radial floating assembly and an axial floating assembly in sequence, so that the upper grinding disc realizes axial floating and radial floating; through the cooperation of the radial floating assembly and the axial floating assembly, the pressure distribution between the upper grinding disc and a lower grinding disc is uniform, thereby reducing the damage of the steel ball processing vibration and reaction force to the lead screw and a servo motor, and further ensuring that the pressure of the whole grinding surface of the upper grinding disc on the steel ball is consistent, improving the consistency of the processing precision of the same batch of steel balls and the processing efficiency of the steel balls.

Description

Technical Field

[0001] This utility model relates to a steel ball grinding machine, specifically to an adaptive floating structure for the upper plate of a vertical steel ball grinding machine. Background Technology

[0002] The vertical steel ball milling machine uses a fixed upper plate for pressurization and a rotating lower plate for grinding the steel ball between the two plates. The upper plate of the vertical steel ball milling machine produced by our company generally adopts two structures: hydraulic drive pressurization or servo motor drive pressurization. Both of these pressurization methods are mature structures of our company, but each has its own advantages and disadvantages. Users can choose according to their own processing requirements.

[0003] The vertical steel ball processing machine operates on the principle of a fixed upper platen applying pressure while the lower platen rotates. Regardless of whether the upper platen is hydraulically or mechanically pressurized, it must float during steel ball processing to avoid impact from the steel balls, which could damage the equipment and affect processing accuracy. When the upper platen is hydraulically driven, the lower outer circle of the piston rod and the bushing on the pressure plate form a floating structure. This structure is simple and convenient, but because it is directly connected to the piston rod, prolonged use may cause piston rod deformation, leading to cylinder leakage and uneven pressure, affecting processing accuracy and efficiency, and causing environmental pollution. When the upper platen is mechanically pressurized, it floats based on the gap between the lead screw and nut. This hard-on-hard contact can lead to excessive gaps over time, nut wear, inaccurate feed, and uneven pressure, all of which affect steel ball processing accuracy. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides an adaptive floating structure for the upper plate of a vertical steel ball grinding machine, aiming to improve the consistency of the processing accuracy of the steel ball grinding machine and reduce the maintenance cost during the use of the equipment.

[0005] An adaptive floating structure for the upper plate of a vertical steel ball grinding machine includes a base, a portal frame fixedly mounted on the base, an upper grinding disc disposed within the portal frame, and the upper grinding disc suspended on the crossbeam of the portal frame via a lifting assembly. The lifting assembly includes a vertical lead screw, the upper end of which passes through and rotatably engages with the crossbeam, and the upper end of the lead screw is connected to a drive mechanism fixedly mounted on the crossbeam, which drives the lead screw to rotate. A lead screw nut is rotatably mounted on the lead screw, and the lead screw nut is fixedly connected to the upper grinding disc after passing through a radial floating assembly and an axial floating assembly in sequence, thereby enabling the upper grinding disc to float axially and radially.

[0006] Furthermore, the radial floating assembly includes an inner bearing housing, a self-aligning roller bearing, and an outer bearing housing arranged radially from the inside to the outside. The inner bearing housing is fixedly sleeved on the lead screw nut, the inner ring of the self-aligning roller bearing is fixedly sleeved on the inner bearing housing, and the outer bearing housing is fixedly sleeved on the outer ring of the self-aligning roller bearing. A limiting mechanism is provided between the inner bearing housing and the outer bearing housing to limit the relative rotation between the two.

[0007] Further, the limiting mechanism includes limiting screws evenly distributed around the lower part of the outer bearing housing, and a limiting ring fixedly connected to the lower part of the inner bearing housing, the limiting ring being located below the self-aligning roller bearing; the limiting screws are arranged laterally and correspond to the limiting rings, the limiting screws penetrate the outer bearing housing and their outer ends are threaded into the outer bearing housing, and a limiting notch is provided at the edge of the limiting ring corresponding to the inner end of the limiting screw, the inner end of the limiting screw being located within the limiting notch and fitting against the two side walls of the limiting notch.

[0008] Furthermore, the inner bearing housing is connected to the lead screw nut via a nut seat. The nut seat is fixedly sleeved on the lead screw nut, and the lower part of the nut seat extends downward to form a fixed part. The inner bearing housing is located on the fixed part, and a dust cover is sealed and fixedly connected between the outer bearing housing and the crossbeam.

[0009] Furthermore, the axial floating assembly includes an upper spring seat, a compression spring, and a lower spring seat arranged sequentially from top to bottom along the axial direction. The compression spring is arranged vertically, and its upper and lower ends abut against the upper spring seat and the lower spring seat, respectively. The upper spring seat is fixedly connected to the lower part of the outer bearing seat, and the lower spring seat is fixedly connected to the top surface of the upper grinding disc.

[0010] Furthermore, vertical guide rods are evenly distributed between the upper spring seat and the lower spring seat. The lower end of the guide rod is fixedly connected to the lower spring seat, and the upper end of the guide rod passes through the upper spring seat and slides with it. A preload nut is threaded onto the upper end of the guide rod, and the preload nut stops on the top surface of the upper spring seat.

[0011] Furthermore, the lower spring seat includes a fixed sleeve and a sliding seat with a sliding sleeve inside the fixed sleeve. The fixed sleeve is fixedly connected to the upper grinding disc. The lower end of the compression spring abuts against the sliding seat and moves up and down with the sliding seat. An annular weighing sensor is provided between the bottom surface of the sliding seat and the top surface of the upper grinding disc. The weighing sensor is used to indirectly measure the pressure between the upper and lower grinding discs.

[0012] Furthermore, the drive mechanism includes a servo motor and a reducer, with the lead screw linked to the servo motor via the reducer.

[0013] The beneficial effects of this utility model are as follows: through the cooperation of the radial floating component and the axial floating component, the pressure distribution between the upper and lower grinding discs is made uniform, the levelness of the upper grinding disc is improved, thereby reducing the damage to the lead screw and servo motor caused by the vibration and reaction force of steel ball processing, and ensuring that the pressure on the steel ball on the entire grinding surface of the upper grinding disc is consistent, thus improving the consistency of the processing accuracy of steel balls in the same batch and the processing efficiency of steel balls. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 for Figure 2 AA cross-sectional view of the middle structure. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0016] An adaptive floating structure for the upper plate of a vertical steel ball grinding machine, such as Figure 1 As shown, the system includes a base 1, on which a lower grinding disc 2 is rotatably mounted. A portal frame 3 is fixedly mounted on the base 1. Columns 32 on both sides of the portal frame 3 are located on opposite sides of the lower grinding disc 2. An upper grinding disc 8 is disposed within the portal frame 3, corresponding vertically to the lower grinding disc 2. The upper grinding disc 8 is suspended on the crossbeam 31 of the portal frame 3 via a lifting assembly. The lifting assembly includes a vertical lead screw 5, the upper end of which passes through and rotatably engages with the crossbeam 31. The upper end of the lead screw 5 is connected to a drive mechanism 4 fixedly mounted on the crossbeam 31. The drive mechanism 4 includes a servo motor 41 and a reducer 42. The lead screw 5 is linked to the servo motor 41 via the reducer 42. The lead screw 5 is driven to rotate by the drive mechanism 4. A lead screw nut 51 is rotatably mounted on the lead screw 5. The lead screw nut 51 is fixedly connected to the upper grinding disc 8 via a radial floating assembly 6 and an axial floating assembly 7, thereby enabling the upper grinding disc 8 to float axially and radially.

[0017] Among them, combined Figure 2 and Figure 3As shown, the radial floating assembly 6 includes an inner bearing housing 61, a self-aligning roller bearing 62, and an outer bearing housing 63 arranged radially from the inside to the outside. The inner bearing housing 61 is fixedly sleeved on the lead screw nut 51, the inner ring of the self-aligning roller bearing 62 is fixedly sleeved on the inner bearing housing 61, and the outer bearing housing 63 is fixedly sleeved on the outer ring of the self-aligning roller bearing 62. A limiting mechanism is provided between the inner bearing housing 61 and the outer bearing housing 63 to limit their relative rotation. The limiting mechanism includes limiting screws 631 evenly distributed around the lower part of the outer bearing housing 63, and a limiting ring 611 fixedly connected to the lower part of the inner bearing housing 61, located below the self-aligning roller bearing 62. The limiting screws 631 are arranged laterally and correspond to the limiting ring 611. The limiting screws 631 penetrate the outer bearing housing 63, and their outer ends are threaded into the outer bearing housing 63. The limiting ring 611 is positioned at the edge corresponding to the inner end of the limiting screw 631. A limiting notch 612 is provided to cooperate with the limiting screw 631. The inner end of the limiting screw 631 is located inside the limiting notch 612 and is in contact with the two side walls of the limiting notch 612. During assembly, the inner end of the limiting screw 631 is pressed against the bottom surface of the limiting notch 612, thereby making the inner bearing housing 61, the self-aligning roller bearing 62 and the outer bearing housing 63 coaxially arranged. During operation, the limiting screw 631 is loosened, allowing the radial floating assembly 6 to float radially. To protect the self-aligning roller bearing 62 from dust, the inner bearing housing 61 is connected to the lead screw nut 51 via a nut seat 52. The nut seat 52 is fixedly sleeved on the lead screw nut 51, and the lower part of the nut seat 52 extends downward to form a fixing part 521. The inner bearing housing 61 is located on the fixing part 521. A dust cover 9 is sealed and fixedly connected between the outer bearing housing 63 and the crossbeam 31. The lead screw nut 51, the nut seat 52, and the self-aligning roller bearing 62 are all located inside the dust cover 9.

[0018] The axial floating assembly 7 includes an upper spring seat 71, a compression spring 73, and a lower spring seat 74 arranged sequentially from top to bottom along the axial direction. The compression spring 73 is vertically arranged, and its upper and lower ends abut against the upper spring seat 71 and the lower spring seat 74, respectively. The upper spring seat 71 is fixedly connected to the lower part of the outer bearing seat 63, and the lower spring seat 74 is fixedly connected to the top surface of the upper grinding disc 8, keeping the upper grinding disc 8 and the lead screw 5 coaxial. To prevent radial floating of the axial floating assembly, vertical guide rods 72 are evenly distributed between the upper spring seat 71 and the lower spring seat 74. The lower end of the guide rod 72 is fixedly connected to the lower spring seat 74, and the upper end of the guide rod 72 passes through the upper spring seat 71 and slides with it. The upper end of the guide rod 72 is threaded with a preload nut, which stops on the top surface of the upper spring seat 71. The guide rod 72 is arranged around the edge of the upper spring seat 71. In order to measure the pressure between the upper grinding disc 8 and the lower grinding disc 2, the lower spring seat 74 includes a fixed sleeve 741 and a sliding seat 742 slidably sleeved in the fixed sleeve 741. The fixed sleeve 741 is fixedly connected to the upper grinding disc 8, specifically by bolting. The lower end of the compression spring 73 abuts against the sliding seat 742 and moves up and down with the sliding seat 742. An annular weighing sensor 81 is provided between the bottom surface of the sliding seat 742 and the top surface of the upper grinding disc 8. The weighing sensor 81 is used to indirectly measure the pressure between the upper grinding disc 8 and the lower grinding disc 2.

[0019] The working principle of this utility model is as follows: The guide rod 72 pre-tightens the compression spring 73 through the pre-tightening nut. The servo motor 41 drives the lead screw 5 to rotate. The lead screw nut 51 drives the nut seat 52, the radial floating component 6 and the axial floating component 7 to move, and pushes the upper grinding disc 8 to move downward. When the upper grinding disc 8 contacts the lower grinding disc 2, the upper spring seat 71 squeezes the compression spring 73, and the pressure is indirectly judged by the weighing sensor 81. When the pressure between the upper grinding disc 8 and the steel ball reaches the set value, the pressure is locked by the servo motor 41 and the lead screw nut 51. The lower grinding disc 2 is rotated so that the upper grinding disc 8 and the lower grinding disc 2 grind the steel ball located between them. During the grinding process, the upper grinding disc 8 is constantly impacted by the reaction force of the steel ball, and the compression spring 73 and the self-aligning roller bearing 62 offset the impact, thereby reducing the damage to the lead screw 5 and the servo motor 41 caused by the vibration and reaction force of the steel ball. When the upper grinding disc 8 needs to rise, the servo motor 41 drives the lead screw nut 51 to move the upper grinding disc 8 upward.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adaptive floating structure for the upper grinding disc of a vertical steel ball grinding machine, comprising a base, a portal frame fixedly mounted on the base, an upper grinding disc disposed within the portal frame, and the upper grinding disc suspended on the crossbeam of the portal frame via a lifting assembly; characterized in that: The lifting assembly includes a vertical lead screw, the upper end of which is mounted through and rotatably engaged with a crossbeam. The upper end of the lead screw is connected to a drive mechanism fixedly mounted on the crossbeam, and the lead screw is driven to rotate by the drive mechanism. A lead screw nut is rotatably mounted on the lead screw, and the lead screw nut is fixedly connected to the upper grinding disc after passing through a radial floating assembly and an axial floating assembly in sequence, thereby enabling the upper grinding disc to float axially and radially.

2. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 1, characterized in that: The radial floating assembly includes an inner bearing housing, a self-aligning roller bearing, and an outer bearing housing arranged radially from the inside to the outside. The inner bearing housing is fixedly sleeved on the lead screw nut, the inner ring of the self-aligning roller bearing is fixedly sleeved on the inner bearing housing, and the outer bearing housing is fixedly sleeved on the outer ring of the self-aligning roller bearing. A limiting mechanism is provided between the inner bearing housing and the outer bearing housing to limit the relative rotation between the two.

3. The adaptive floating structure of the upper platen of the vertical steel ball grinding machine according to claim 2, characterized in that: The limiting mechanism includes limiting screws evenly distributed around the lower part of the outer bearing housing, and a limiting ring fixedly connected to the lower part of the inner bearing housing. The limiting ring is located below the self-aligning roller bearing. The limiting screws are arranged laterally and correspond to the limiting ring. The limiting screws pass through the outer bearing housing and their outer ends are threaded into the outer bearing housing. A limiting notch is provided at the edge of the limiting ring at the position corresponding to the inner end of the limiting screw. The inner end of the limiting screw is located in the limiting notch and fits against the two side walls of the limiting notch.

4. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 2, characterized in that: The inner bearing housing is connected to the lead screw nut via a nut seat. The nut seat is fixedly sleeved on the lead screw nut, and the lower part of the nut seat extends downward to form a fixed part. The inner bearing housing is located on the fixed part, and a dust cover is sealed and fixedly connected between the outer bearing housing and the crossbeam.

5. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 1, characterized in that: The axial floating assembly includes an upper spring seat, a compression spring, and a lower spring seat arranged sequentially from top to bottom along the axial direction. The compression spring is arranged vertically, and its upper and lower ends abut against the upper spring seat and the lower spring seat, respectively. The upper spring seat is fixedly connected to the lower part of the outer bearing seat, and the lower spring seat is fixedly connected to the top surface of the upper grinding disc.

6. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 5, characterized in that: Vertical guide rods are evenly distributed between the upper and lower spring seats. The lower end of the guide rod is fixedly connected to the lower spring seat, and the upper end of the guide rod passes through the upper spring seat and slides with it. The upper end of the guide rod is threaded with a preload nut, which stops on the top surface of the upper spring seat.

7. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 5, characterized in that: The lower spring seat includes a fixed sleeve and a sliding seat with a sliding sleeve inside the fixed sleeve. The fixed sleeve is fixedly connected to the upper grinding disc. The lower end of the compression spring abuts against the sliding seat and moves up and down with the sliding seat. An annular weighing sensor is provided between the bottom surface of the sliding seat and the top surface of the upper grinding disc. The weighing sensor is used to indirectly measure the pressure between the upper and lower grinding discs.

8. The adaptive floating structure of the upper plate of the vertical steel ball grinding machine according to claim 1, characterized in that: The drive mechanism includes a servo motor and a reducer, and the lead screw is linked to the servo motor through the reducer.

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