Mandrel bearing assembly for drawing leather roller

Abstract

The utility model discloses a mandrel bearing assembly for a drawing leather roller, which comprises a mandrel and bearings coaxially arranged at the two ends of the mandrel, and is characterized in that the two ends of the mandrel are respectively and integrally contracted and extended to form cylindrical bearing supporting parts, and are respectively provided with a bearing outer ring; the bearing outer ring is arranged on the bearing supporting part in a sleeving mode, and balls and / or roller pins are arranged between the bearing outer ring and the bearing supporting part in a sleeving mode. The bearing supporting part, the balls and / or roller pins and the bearing outer ring jointly form a bearing structure. The outer diameter of the bearing outer ring is not greater than that of the mandrel; and a detachable end cover is arranged at the outer end of the bearing outer ring. When the leather roller is polished or replaced, the bearing does not need to be detached, operation is convenient, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This utility model relates to an accessory for textile machinery, specifically to a mandrel and bearing assembly for drawing rollers. Background Technology

[0002] In textile machinery, the drawing sliver roller is a traction component. The drawing sliver roller mainly consists of a central mandrel and a roller fitted on the mandrel and tightly fitted to the mandrel. Generally, bushings are set at both ends of the mandrel, and the mandrel and bushings together form a connecting part. The outer ends of the bushings at both ends are mounted on the frame, thereby realizing the free rotation of the roller mandrel.

[0003] During use, drawing sliver rollers may develop wear, burrs, and unevenness due to friction with the yarn, affecting yarn quality and the roller's grip and drafting performance, necessitating polishing. Generally, polishing is required approximately every 20 days. Polishing removes these defects, restores the smoothness and roundness of the roller surface, and extends its service life. During polishing, the roller is typically first mounted on the roller drive shaft of the polishing machine, secured by the roller clamping end and the roller top pressure seat, allowing it to rotate synchronously with the drive shaft. To accommodate the roller top pressure seat, the bushing at the end of the mandrel usually needs to be removed, polished, and then reinstalled.

[0004] When the roller wears to a certain extent, such as when its diameter is smaller than the specified size, or when there is severe damage, deformation, or aging on the roller surface that cannot be repaired by grinding, the roller needs to be replaced in time to ensure the normal operation of the drawing frame and the quality of the yarn. Since the size of the mating part between the bushing and the frame is usually larger than the outer diameter of the mandrel, when replacing the roller, the bushing also needs to be removed, the roller replaced, and then the bushing reinstalled.

[0005] Sleeve bearings or bushings are typically installed at both ends of the mandrel used in rolling mills. For example, Chinese invention application CN106015319A discloses a sleeve bearing for rolling mills, which includes a bearing housing and a bearing mandrel. The inner bore of the bearing housing has two R-shaped inner grooves. One end of the bearing mandrel has a tapered outer circle, the taper and size of which match the inner tapered bore of the mandrel. The non-tapered outer circle of the bearing mandrel has two R-shaped outer grooves, the positions of which match the R-shaped inner grooves of the bearing housing. Steel balls are fitted into the R-shaped inner grooves of the bearing housing and the corresponding R-shaped outer grooves of the bearing mandrel. The steel balls are evenly spaced by a cage. A sealing ring and a positioning ring are pressed into the inner bores at both ends of the bearing housing, respectively. The sealing ring and the tapered outer circle of the bearing mandrel are at the same end. This design achieves connection by matching the tapered outer circle of the bearing with the inner tapered bore of the mandrel. However, this method is prone to misalignment during assembly and disassembly, and is susceptible to wear.

[0006] Chinese utility model patent CN205133840U discloses an improved bushing structure for a drawing roller mandrel, comprising a mandrel and a bushing coaxially fitted on the mandrel. A portion of the mandrel inserted into the bushing is a conical cylinder. A bearing sleeve is disposed within the bushing, and the inner wall of the bearing sleeve has an inner conical surface matching the conical cylinder. A matching clamp of the bearing sleeve is attached to the conical cylinder. Two sets of balls are axially distributed between the outer wall of the bearing sleeve and the inner wall of the bushing. The bearing sleeve, the bushing, and the two sets of balls form a double-row ball bearing structure. A fixing disc is disposed at one end of the bearing sleeve corresponding to the end face of the conical cylinder. The outer diameter of the fixing disc is smaller than the outer diameter of the bearing sleeve but larger than the inner diameter of the bearing sleeve at its corresponding end. A screw is axially threaded through the center of the fixing disc and is threaded to the end face of the conical cylinder. This solution achieves alignment and connection with the drawing roller mandrel by using a bushing with an inner conical surface. However, it has problems such as the inner ring being prone to deformation during disassembly and assembly, and difficulty in achieving concentricity during installation.

[0007] Therefore, it is necessary to improve the combined structure of the roller mandrel and bearing to overcome the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a spindle bearing assembly for drawing rollers, which allows for the grinding and replacement of the rollers without disassembling the bearing body.

[0009] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: a mandrel bearing assembly for a drawing roller, comprising a mandrel and bearings coaxially disposed at both ends of the mandrel. The two ends of the mandrel are integrally contracted and extended to form cylindrical bearing support portions. Bearing outer rings are respectively provided at both ends of the mandrel. The bearing outer rings are sleeved on the bearing support portions, and ball bearings and / or needle bearings are sleeved between the two. The bearing support portions, ball bearings and / or needle bearings, and bearing outer rings together constitute the bearing structure. The outer diameter of the bearing outer rings is not greater than the outer diameter of the mandrel. A detachable end cap is provided at the outer end of the bearing outer rings.

[0010] In the above technical solution, the extension of the mandrel serves as the bearing support, functioning as the inner ring of the bearing. There is no need for installation and removal of the inner ring, thus preventing deformation and misalignment issues. A removable end cap is provided at the outer end of the bearing outer ring. When grinding the roller is required, simply remove the end cap to expose the end of the mandrel, which can then be fixed by the roller's pressure seat without disassembling the bearing or outer ring. The outer diameter of the bearing outer ring is not greater than the outer diameter of the mandrel, allowing the roller to be installed and removed via the bearing outer ring without disassembling it. Since the roller and mandrel are tightly fitted, in a preferred embodiment, the outer diameter of the bearing outer ring is slightly smaller than the outer diameter of the mandrel, for example, by 0.05–0.15 mm, which further facilitates the disassembly and installation of the roller.

[0011] In the above technical solution, when the ball bearing is set, the inner hole of the outer ring of the bearing is provided with an inner channel, and the bearing support is provided with an outer channel. The ball bearing is located between the corresponding inner channel and outer channel and is isolated by a cage. When the needle roller is set, it is limited by a limiting piece. Two rows of ball bearings are set respectively, or one row of ball bearings and one row of needle rollers, or one row of ball bearings and two rows of needle rollers.

[0012] In the above technical solutions, the structure in which the mandrel end mates with the grinding machine is a conventional technique. One approach is to have a central hole at the center of the mandrel's end face, using a convex ejector pin to support the grinding roller. Another approach is to have the end of the mandrel set with a tapered outer angle, using a concave ejector pin to support the grinding roller.

[0013] In one of the above technical solutions, the outer periphery of the detachable end cover is tightly fitted with the inner periphery of the bearing outer ring. The end cover has an axial protrusion that mates with the mounting frame, and a screw hole is provided in the center of the axial protrusion. When it is necessary to remove the end cover, a jig can be screwed into the screw hole to pull the end cover out.

[0014] Preferably, the screw hole is a through hole.

[0015] Another technical solution is that a limiting step is provided on the inner wall of the outer ring of the bearing, and the inner end of the detachable end cap is locked on the limiting step, while the outer end is limited by an end cap limiter. The end cap limiter can be a retaining spring; removing the retaining spring allows the end cap to be removed.

[0016] Preferably, the end cap has an axial protrusion at the center that mates with the mounting frame.

[0017] A further technical solution involves a dustproof ring fitted between the mandrel and the inner end of the bearing outer ring. The dustproof ring can be sleeved on the mandrel, serving both as a dustproof structure and forming an internal lubrication cavity for the bearing. Alternatively, the dustproof ring can be fixedly connected to the bearing outer ring.

[0018] A further technical solution involves installing a detachable housing on the outer ring of the bearing. This detachable housing allows for an increase in the bearing's outer diameter, making it compatible with existing drawing frame frames.

[0019] In the above technical solution, a detachable housing limiter is provided on the outer circumference of the bearing outer ring for positioning the detachable housing. The detachable housing limiter can be a snap ring.

[0020] A preferred technical solution includes at least two types of detachable housings, each with different outer diameters or wall thicknesses. After the rollers are ground, their outer diameter decreases, leading to a larger gap between the rollers and adjacent traction rollers, affecting the driving effect. Using detachable housings with different outer diameters allows for changes in the frame's clamping position, thereby slightly adjusting the roller gap and improving performance. Using detachable housings with different wall thicknesses achieves the same technical effect: adjusting the gap size by changing the distance from the detachable housing to the spindle's central axis.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] 1. In this utility model, a detachable end cap is provided at the outer end of the bearing outer ring. When grinding is required on the roller, only the end cap needs to be removed to expose the end of the mandrel, which can then be fixed by the roller top pressure seat without disassembling the bearing or outer ring. The outer diameter of the bearing outer ring is not greater than the outer diameter of the mandrel, so the roller can be installed and removed through the bearing outer ring without disassembling it. Therefore, the bearing does not need to be disassembled during use, which facilitates operation and extends the service life of the bearing.

[0023] 2. This utility model uses the extension of the mandrel as the bearing support, which acts as the inner ring of the bearing. There is no need to install or disassemble the inner ring of the bearing, so it will not cause deformation of the inner ring of the bearing, nor will it cause the problem of misalignment during installation.

[0024] 3. In this utility model, a detachable outer shell is fitted on the outer ring of the bearing. On the one hand, the outer diameter of the bearing can be increased to adapt to some existing drawing frame frames; on the other hand, by configuring detachable outer shells with different outer diameters, the gap of the rollers can be adjusted after the outer diameter of the rollers is ground and becomes smaller, thereby improving the performance. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the structure of Embodiment 1 of this utility model;

[0026] Figure 2 yes Figure 1 The right view;

[0027] Figure 3 This is a schematic cross-sectional view of the structure of Embodiment 2 of this utility model;

[0028] Figure 4 yes Figure 3 The right view.

[0029] The components include: 1. mandrel; 2. bearing support; 3. bearing outer ring; 4. ball; 5. cage; 6. end cap; 7. dust ring; 8. screw hole; 9. center hole; 10. snap ring; 11. detachable housing; 12. axial protrusion; 13. detachable housing limiter; 14. limit step. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Example 1: See Figure 1 and Figure 2 As shown, a mandrel bearing assembly for a drawing roller includes a mandrel 1. Both ends of the mandrel 1 are integrally tapered to form cylindrical bearing support portions 2. Bearing outer rings 3 are provided at both ends of the mandrel. The inner bore of the bearing outer rings 3 has two inner grooves, and the bearing support portions 2 have correspondingly two outer grooves. The bearing outer rings 3 are fitted onto the bearing support portions 2, and ball bearings 4 are fitted between the corresponding inner and outer grooves. The ball bearings 4 are positioned and isolated by a cage 5. Thus, the bearing support portions 2, the ball bearings 4, and the bearing outer rings 3 together constitute a bearing structure, allowing the mandrel to rotate on the machine frame.

[0032] The outer diameter of the bearing outer ring 3 is slightly smaller than the outer diameter of the mandrel 1; in this embodiment, the difference is approximately 0.08 mm. Therefore, the roller can be installed or removed from the mandrel without disassembling the bearing.

[0033] A detachable end cap 6 is provided at the outer end of the bearing outer ring 3. A center hole 9 is provided in the center of the end face of the spindle 1.

[0034] In this embodiment, the outer periphery of the detachable end cover 6 is tightly fitted with the inner periphery of the bearing outer ring 3. The end cover 6 has an axial protrusion 12 that cooperates with the mounting frame, and a screw hole 8 is provided in the center of the axial protrusion 12.

[0035] In this embodiment, screw hole 8 is a through hole.

[0036] A dustproof ring 7 is fitted onto the bearing support portion 2 of the spindle 1, which mates with the inner end of the outer ring 3 of the bearing. In this embodiment, a dustproof ring can also be fitted onto the outer end of the bearing support portion 2. The main function of the dustproof ring is to prevent dust, but it also creates a relatively enclosed space inside the bearing to accommodate lubricating grease.

[0037] In this embodiment, since the bearing does not have a separate inner ring, but the bearing support part that extends integrally from the spindle acts as the inner ring of the bearing, there are no problems such as deformation or misalignment caused by disassembly and assembly of the inner ring, and it is not easy to wear.

[0038] Example 2: See Figure 3 and Figure 4 As shown, a mandrel bearing assembly for a drawing roller includes a mandrel 1. Both ends of the mandrel 1 are integrally tapered to form cylindrical bearing support portions 2. Bearing outer rings 3 are provided at both ends of the mandrel. The inner bore of the bearing outer rings 3 has two inner grooves, and the bearing support portions 2 have correspondingly two outer grooves. The bearing outer rings 3 are fitted onto the bearing support portions 2, and ball bearings 4 are fitted between the corresponding inner and outer grooves. The ball bearings 4 are positioned and isolated by a cage 5. Thus, the bearing support portions 2, the ball bearings 4, and the bearing outer rings 3 together constitute a bearing structure, allowing the mandrel to rotate on the machine frame.

[0039] The outer diameter of the bearing outer ring 3 is not greater than the outer diameter of the mandrel 1. Therefore, the roller can be installed or removed from the mandrel without disassembling the bearing.

[0040] A detachable end cap 6 is provided at the outer end of the bearing outer ring 3. A center hole 9 is provided in the center of the end face of the spindle 1.

[0041] In this embodiment, a limiting step 14 is provided on the inner wall of the bearing outer ring 3. The inner end of the detachable end cover 6 is engaged with the limiting step 14, and the outer end is limited by an end cover limiter. In this embodiment, the end cover limiter is a retaining spring 10. The end cover has an axial protrusion 12 in the center that cooperates with the mounting frame.

[0042] In this embodiment, a detachable outer shell 11 is fitted onto the outer ring 3 of the bearing, and each end is positioned by a detachable outer shell limiter 13. The detachable outer shell limiter 13 can be a retaining ring.

[0043] Depending on the requirements, various detachable housings with different outer diameters or different wall thicknesses can be configured. The variation in outer diameter and wall thickness is generally determined based on the polishing process, and can be as small as 0.1 mm.

[0044] After the rollers are ground, their outer diameter decreases, resulting in a larger gap between the rollers and adjacent traction rollers, affecting the driving effect. Since adjusting the gap by adjusting the frame is difficult, many users do not adjust the gap, thus affecting the equipment's usability. This embodiment can be configured with various detachable housings of different outer diameters. After grinding the rollers, selecting a detachable housing with a different outer diameter allows the frame's clamping position to change, thus adjusting the roller gap without adjusting the frame, conveniently improving the operating effect.

[0045] A dustproof ring 7 is fitted onto the bearing support part 2 of the spindle 1, which mates with the inner end of the outer ring 3 of the bearing. The main function of the dustproof ring is to prevent dust, but it also creates a relatively enclosed space inside the bearing to accommodate lubricating grease.

[0046] Example 3: In the structure of Example 1 or Example 2, the rolling part between the bearing support and the bearing outer ring is changed, and one ring of ball rollers and one ring of needle rollers, or one ring of ball rollers and two rings of needle rollers, are set. When ball rollers are set, the inner hole of the bearing outer ring has an inner channel, and the bearing support has a corresponding outer channel. The ball rollers are located between the corresponding inner and outer channels and are isolated by a cage. When needle rollers are set, they are limited by a limiting piece.

Claims

1. A mandrel bearing assembly for a drawing roller, comprising a mandrel and bearings coaxially disposed at both ends of the mandrel, characterized in that: The two ends of the mandrel are integrally contracted and extended to form cylindrical bearing support parts. Each end of the mandrel is provided with a bearing outer ring. The bearing outer ring is sleeved on the bearing support part and ball and / or needle rollers are sleeved between the two. The bearing support part, ball and / or needle rollers and bearing outer ring together constitute the bearing structure. The outer diameter of the bearing outer ring is not greater than the outer diameter of the mandrel. A detachable end cap is provided at the outer end of the bearing outer ring.

2. The spindle bearing assembly for drawing sliver rollers according to claim 1, characterized in that: When ball bearings are installed, the inner hole of the outer ring of the bearing has an inner channel, and the bearing support has a corresponding outer channel. The ball bearings are located between the corresponding inner and outer channels and are isolated by a cage. When needle rollers are installed, they are limited by a limiting piece. Two rows of ball bearings, one row of ball bearings and one row of needle rollers, or one row of ball bearings and two rows of needle rollers are installed respectively.

3. The spindle bearing assembly for drawing rollers according to claim 1, characterized in that: The outer periphery of the detachable end cover is tightly fitted with the inner periphery of the outer ring of the bearing. The end cover has an axial protrusion that cooperates with the mounting frame, and a screw hole is provided in the center of the axial protrusion.

4. The spindle bearing assembly for drawing rollers according to claim 3, characterized in that: The screw hole is a through hole.

5. The spindle bearing assembly for drawing rollers according to claim 1, characterized in that: The inner wall of the outer ring of the bearing is provided with a limiting step, the inner end of the detachable end cap is locked on the limiting step, and the outer end is limited by the end cap limiter.

6. The spindle bearing assembly for drawing sliver rollers according to claim 5, characterized in that: The end cap has an axial protrusion in the center that mates with the mounting frame.

7. The spindle bearing assembly for drawing rollers according to claim 1, characterized in that: A dustproof ring is provided between the mandrel and the inner end of the outer ring of the bearing.

8. The spindle bearing assembly for drawing rollers according to claim 1, characterized in that: A detachable housing is fitted onto the outer ring of the bearing.

9. The spindle bearing assembly for drawing rollers according to claim 8, characterized in that: The bearing outer ring is provided with a detachable housing limiter for positioning the detachable housing.

10. The spindle bearing assembly for drawing rollers according to claim 8, characterized in that: It is equipped with at least two types of detachable housings, which have different outer diameters or different wall thicknesses.

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