Roller type center frame
By designing separately assembleable roller assemblies and double-row tapered roller bearings, the problem of poor rotational accuracy of traditional roller-type center supports has been solved, improving the machining accuracy of workpieces and the ability to adjust contact surfaces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-03-17
AI Technical Summary
The roller-type center rest of traditional horizontal lathes suffers from poor rotational accuracy and difficulty in adjusting the contact surface, resulting in low workpiece machining accuracy.
Design a roller assembly that can be assembled separately, including a support shaft, a U-shaped groove, a left pressure cap, a right pressure cap, and a sealing ring. By adjusting the contact surface of the support shaft and the slide column, good contact between the roller and the workpiece is ensured. Double-row tapered roller bearings are used to improve rotational accuracy.
This achieves precise contact between the roller and the workpiece, improving processing quality and accuracy, and facilitating the adjustment and maintenance of the contact surface.
Smart Images
Figure CN223997809U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machine tool accessories technology, specifically a roller-type center rest. Background Technology
[0002] The roller-type center rest is an important component of a horizontal lathe. The rotational accuracy of the center rest rollers and the quality of the contact surface between the rollers and the workpiece directly determine the machining accuracy of the workpiece.
[0003] Traditional horizontal lathes use a "through-shaft" structure for their roller-type center rests, where the rollers, bearings, and roller support shafts are sequentially inserted into the center rest slide columns. This structure has several problems: the center rest rollers are ground separately; after installing the bearings into the rollers and inserting them into the center rest slide columns, gaps exist between the bearings and rollers, and between the roller support shafts and the center rest slide columns, resulting in poor rotational accuracy of the roller assembly. Furthermore, whether the roller assembly makes complete contact with the workpiece depends entirely on the machining accuracy of the center rest body, which is difficult to guarantee, and cannot be adjusted after installation. Summary of the Invention
[0004] To address the aforementioned problems, this utility model provides a roller-type center frame, configured as a separately assembled roller assembly, which can be adjusted according to the contact conditions with the workpiece to ensure contact accuracy. The technical solution adopted by this utility model is as follows:
[0005] A roller-type center frame includes a frame body and a sliding column. A support shaft is mounted on the sliding column, and two U-shaped grooves are provided at the ends of the sliding column. The two ends of the support shaft are pressed and installed in the U-shaped grooves by pressure blocks. A roller assembly is mounted on the support shaft.
[0006] The roller assembly includes a roller, a left pressure cover, and a right pressure cover. The roller is rotatably mounted on a support shaft via a bearing. The left pressure cover is mounted on the left end face of the roller and is fitted onto the support shaft with a gap. The right pressure cover is mounted on the right end face of the roller and is fitted onto the support shaft with a gap.
[0007] In the aforementioned roller-type center frame, a sealing ring I is installed on the left pressure cover to cooperate with the support shaft, and a sealing ring II is provided on the right pressure cover to cooperate with the locking nut. The locking nut is installed on the support shaft to press the bearing.
[0008] The aforementioned roller-type center frame has a pair of double-row tapered roller bearings.
[0009] In the aforementioned roller-type center frame, the left and right pressure covers are respectively mounted on the roller end face with several fastening screws I, and the pressure block is connected to the slide column by several fastening screws II.
[0010] The beneficial effects of this utility model are as follows: by installing a separate roller assembly on the support shaft, the entire assembly can be disassembled and installed. During use, the contact surfaces of the support shaft and the slide column can be manually scraped at any time according to the contact condition between the roller and the workpiece, ensuring the accuracy of the contact surface and improving the processing quality. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall installation of an embodiment of the present utility model;
[0012] Figure 2 for Figure 1 Schematic diagram of the AA-direction section;
[0013] Figure 3 for Figure 2 Schematic diagram of the BB-direction section.
[0014] In the diagram: 1-Machine bed, 2-Frame, 3-Slide column, 4-Support shaft, 5-Sealing ring I, 6-Left pressure cover, 7-Roller, 8-Double row tapered roller bearing, 9-Right pressure cover, 10-Sealing ring II, 11-Spacer, 12-Locking nut, 13-Fasting screw I, 14-Pressure block, 15-Fasting screw II. Detailed Implementation
[0015] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings. The following embodiments are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should be noted that the terminology used is for describing specific embodiments only and is not intended to limit the scope of this application.
[0016] This embodiment is a roller-type center frame, including a frame body 2 and a sliding column 3. A support shaft 4 is installed on the sliding column 3. Two U-shaped grooves are provided at the ends of the sliding column 3. The two ends of the support shaft 4 are pressed and installed in the U-shaped grooves by pressure blocks 14. A roller assembly is installed on the support shaft 4.
[0017] Specifically, the roller assembly includes a roller 7, a left pressure cap 6, and a right pressure cap 9. The roller 7 is rotatably mounted on the support shaft 4 via bearings. The left pressure cap 6 is mounted on the left end face of the roller 7 and is fitted onto the support shaft 4 with a gap. The right pressure cap 9 is mounted on the right end face of the roller 7 and is fitted onto the support shaft 4 with a gap. The bearings are a pair of double-row tapered roller bearings 8.
[0018] The left pressure cover 6 is equipped with a sealing ring I5 to cooperate with the support shaft 4, and the right pressure cover 9 is provided with a sealing ring II10 to cooperate with the locking nut 12. The locking nut 12 is installed on the support shaft 4 to press the bearing and prevent the bearing from moving axially.
[0019] The left pressure cover 6 and the right pressure cover 9 are respectively installed on the end face of the roller 7 by a number of fastening screws I13, and the pressure block 14 is connected to the slide column 3 by a number of fastening screws II15.
[0020] In this embodiment, the assembly process of the core frame is as follows:
[0021] 1) After heating the inner ring of the double-row tapered roller bearing 8, as follows: Figure 2 As shown, they pass through sequentially from the right side of support shaft 4, facing each other;
[0022] 2) Install the spacer 11 on the support shaft 4 and close to the inner ring of the double row tapered roller bearing 8. Use the lock nut 12 to press the spacer 11 to press the double row tapered roller bearing 8 and prevent axial movement.
[0023] 3) Freeze the outer ring of the double-row tapered roller bearing 8 and insert it into the inner hole of the roller 7;
[0024] 4) Install sealing ring I5 into the left pressure cover 6 and sealing ring II10 into the right pressure cover 9; after fitting the left pressure cover 6 into the machine, install it on the left end face of the roller 7 with fastening screw I13, but do not tighten the fastening screw I13 completely; after fitting the right pressure cover 9 into the machine, install it on the right end face of the roller 7 with fastening screw I13, but do not tighten the fastening screw I13 completely; alternately tighten the fastening screws I13 of the left pressure cover 6 and the right pressure cover 9 to pre-tighten the outer ring of the double row tapered roller bearing 8; the roller assembly is now complete.
[0025] 5) Press the center holes at both ends of the support shaft 4 and grind the rollers 7 to ensure rotational accuracy;
[0026] 6) Install the frame 2 of the center frame on the machine tool bed 1, and install the slide column 3 on the frame 2 accordingly. Install the support shaft 4 with the roller assembly installed in the U-shaped groove of the slide column 3 and fix it with the pressure block 14 and fastening screw II 15. Check whether the roller 7 and the workpiece have good contact and its rotation accuracy. If it is not qualified, the contact surface between the support shaft 4 and the slide column 3 can be manually scraped and adjusted. At the same time, the pressure block 14 is ground. Then, the support shaft 4 is reinstalled.
[0027] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various changes or improvements without departing from the principles of this application, and these changes or improvements should also be considered within the scope of protection of this application.
Claims
1. A roller-type center stand comprising a stand body (2) and a slide post (3) having a support shaft (4) mounted thereon, characterized in that: The slide column (3) is provided with two U-shaped grooves, and the two ends of the support shaft (4) are tightly installed in the U-shaped grooves by pressing blocks (14); the support shaft (4) is provided with a roller assembly; The roller assembly comprises a roller (7), a left pressing cap (6) and a right pressing cap (9); the roller (7) is rotatably installed on the support shaft (4) by bearings; the left pressing cap (6) is installed on the left end face of the roller (7) and is gap-sleeved on the support shaft (4); and the right pressing cap (9) is installed on the right end face of the roller (7) and is gap-sleeved on the support shaft (4).
2. The roller-type center stand of claim 1, wherein: A sealing ring I (5) is installed on the left pressing cap (6) to cooperate with the support shaft (4); a sealing ring II (10) is arranged on the right pressing cap (9) to cooperate with a locking nut (12); and the locking nut (12) is installed on the support shaft (4) to press the bearings.
3. The roller-type center stand of claim 1, wherein: The bearings are a pair of double-row tapered roller bearings (8).
4. The roller-type center stand of claim 1, wherein: The left pressing cap (6) and the right pressing cap (9) are respectively installed on the end faces of the roller (7) by a plurality of fastening screws I (13); and the pressing blocks (14) are connected to the slide column (3) by a plurality of fastening screws II (15).