Improved circular machine sleeve structure and circular machine

Abstract

The utility model relates to the technical field of circular knitting machines, in particular to an improved circular knitting machine sleeve structure and a circular knitting machine. An upper bearing and a lower bearing are arranged between the mandrel and the sleeve to form rotary connection, an upper circular bead is arranged on the inner wall of the sleeve, an upper oil seal seat is arranged at the upper end of the sleeve, the upper bearing is arranged between the upper oil seal seat and the upper circular bead, and the distance between the lower end face of the upper oil seal seat and the upper circular bead is larger than the height of the upper bearing. The upper bearing has a movement amount in the vertical direction; a lower shoulder is arranged on the inner wall of the sleeve, a lower oil seal seat is arranged at the lower end of the sleeve, the lower bearing is arranged between the lower oil seal seat and the lower shoulder, and the upper end face of the lower oil seal seat and the lower shoulder clamp and position the lower bearing. The central spindle extends upwards when being heated, the horizontal height position of the lower end of the central spindle is not changed, it is guaranteed that the distance between the upper needle dial and the lower needle cylinder is kept unchanged, and the quality of a woven cloth cover is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of circular knitting machines, in particular to an improved sleeve structure of a circular knitting machine and a circular knitting machine. Background Art

[0002] The circular knitting machine is one of the widely used devices in the knitting field. The sleeve structure is an important transmission structure in the circular knitting machine, mainly including a sleeve and a mandrel. The sleeve is installed in the large tripod, and the mandrel is rotatably arranged in the sleeve. Refer to Figure 5 As shown in the existing sleeve structure, the mandrel is installed in the sleeve through two sets of tapered roller bearings arranged up and down with opposite taper directions. The outer rings of the two sets of tapered roller bearings are installed on the end shoulders at both ends of the sleeve, and the inner rings are installed at both ends of the mandrel. The two sets of inner rings are locked in the opposite direction by tightening the circular nuts on the mandrel to achieve positioning. With the operation of the machine, friction heat is inevitably generated. The heat is transferred to the mandrel and accumulated, causing the temperature of the mandrel to rise. The mandrel expands due to heat and its length elongates. In the existing structure, under the action of gravity, the elongation of the mandrel extends downward, and the center of the bead plate connected to the lower end of the mandrel will deviate, resulting in the deviation of the roundness and flatness of the upper needle plate installed on the bead plate relative to the lower needle cylinder, and ultimately affecting the quality of the fabric surface. In order to reduce the influence of the thermal expansion of the mandrel, the existing solution is to increase the tightening force of the circular nut to increase the preload, thereby reducing the amount of elongation of the mandrel due to heat. However, after increasing the preload, the rolling friction force inside the bearing increases, resulting in a reduction in the bearing life and an increase in the failure rate. Therefore, the existing solution cannot fundamentally solve the problem of reducing the quality of the fabric surface caused by the thermal expansion of the mandrel. Therefore, it is urgent to design a new structure to solve the above problems. Summary of the Utility Model

[0003] To overcome the deficiencies in the prior art, the utility model provides an improved sleeve structure of a circular knitting machine and a circular knitting machine that can ensure the quality of the fabric surface remains unchanged after the mandrel expands due to heat.

[0004] To achieve the above object, the technical solution adopted by the utility model is as follows: An improved sleeve structure of a circular knitting machine includes a sleeve and a mandrel. The mandrel is arranged in the sleeve. An upper bearing and a lower bearing are arranged between the mandrel and the sleeve to form a rotational connection. An upper shoulder with an upward-facing end surface is provided on the upper section of the inner wall of the sleeve. An upper oil seal seat is provided at the upper end of the sleeve. The upper bearing is arranged between the upper oil seal seat and the upper shoulder. The distance between the lower end surface of the upper oil seal seat and the upper shoulder is greater than the height of the upper bearing, so that the upper bearing has a vertical movement amount. A lower shoulder with a downward-facing end surface is provided on the lower section of the inner wall of the sleeve. A lower oil seal seat is provided at the lower end of the sleeve. The lower bearing is arranged between the lower oil seal seat and the lower shoulder. The lower bearing is clamped and positioned by the upper end surface of the lower oil seal seat and the lower shoulder.

[0005] Further, it further includes a spacer sleeve. The spacer sleeve is sleeved on the mandrel and is located between the upper bearing and the lower bearing. The upper end of the spacer sleeve abuts against the inner ring of the upper bearing, and the lower end of the spacer sleeve abuts against the inner ring of the lower bearing.

[0006] Further, it further includes a round nut. The round nut is sleeved on the mandrel and is threadedly connected to the mandrel. The lower end of the round nut abuts against the inner ring of the upper bearing, so that the upper bearing is clamped between the round nut and the spacer sleeve; an outwardly extending flange is provided at the lower end of the mandrel, and the upper end of the flange abuts against the inner ring of the lower bearing, so that the lower bearing is clamped between the spacer sleeve and the flange.

[0007] Further, a lock washer is provided at the lower end of the round nut.

[0008] Further, the upper bearing includes two angular contact bearings, and the two angular contact bearings are stacked vertically and arranged back-to-back.

[0009] Further, the upper bearing includes a plurality of deep groove ball bearings, and the deep groove ball bearings are stacked vertically.

[0010] Further, the lower bearing includes two angular contact bearings, and the two angular contact bearings are stacked vertically and arranged back-to-back.

[0011] A circular knitting machine includes the above-mentioned improved circular knitting machine sleeve structure.

[0012] As can be seen from the above description of the present invention, compared with the prior art, the improved circular knitting machine sleeve structure provided by the present invention has the following advantages: By redesigning the rotational connection structure between the sleeve and the mandrel, the upper bearing on the upper section of the mandrel has an up-and-down movement amount, and the lower bearing on the lower section of the mandrel is held in position by clamping. Therefore, when the mandrel expands due to heat, it elongates upward. The horizontal height position of the lower end of the mandrel remains unchanged, so that the center of the bead plate connected to the lower end of the mandrel will not deviate, ensuring that the distance between the upper needle plate and the lower needle cylinder remains unchanged and guaranteeing the quality of the knitted fabric surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of an improved circular knitting machine sleeve structure of the present invention.

[0014] Figure 2 For the present invention Figure 1 Exploded view.

[0015] Figure 3 For the present invention Figure 1 Enlarged schematic view at A in the present invention.

[0016] Figure 4 For the present invention Figure 1 Enlarged schematic view at B in the present invention.

[0017] Figure 5 It is a schematic diagram of the prior art structure mentioned in the background art.

[0018] The markings in the figure correspond as follows: 1 - sleeve, 11 - upper shoulder, 12 - lower shoulder, 2 - mandrel, 21 - flange, 3 - upper bearing, 4 - lower bearing, 5 - upper oil seal seat, 6 - lower oil seal seat, 7 - spacer sleeve, 8 - round nut, 81 - lock washer. Specific embodiments

[0019] The following further describes the present utility model through specific embodiments.

[0020] Referring to Figures 1 to 4 As shown, an improved circular knitting machine sleeve structure includes a sleeve 1, a mandrel 2, an upper bearing 3, a lower bearing 4, an upper oil seal seat 5, a lower oil seal seat 6, a spacer sleeve 7, and a round nut 8.

[0021] The mandrel 2 is arranged inside the sleeve 1. Upper bearings 3 and lower bearings 4 are arranged between the mandrel 2 and the sleeve 1 to form a rotational connection. An upper shoulder 11 with an upward-facing end surface is provided on the upper section of the inner wall of the sleeve 1. An upper oil seal seat 5 is provided at the upper end of the sleeve 1. The upper bearing 3 is arranged between the upper oil seal seat 5 and the upper shoulder 11. The distance between the lower end surface of the upper oil seal seat 5 and the upper shoulder 11 is greater than the height of the upper bearing 3, so that the upper bearing 3 has a vertical movement amount; a lower shoulder 12 with a downward-facing end surface is provided on the lower section of the inner wall of the sleeve 1. A lower oil seal seat 6 is provided at the lower end of the sleeve 1. The lower bearing 4 is arranged between the lower oil seal seat 6 and the lower shoulder 12. The upper end surface of the lower oil seal seat 6 and the lower shoulder 12 clamp and position the lower bearing 4.

[0022] The spacer sleeve 7 is sleeved on the mandrel 2 and is located between the upper bearing 3 and the lower bearing 4. The upper end of the spacer sleeve 7 abuts against the inner ring of the upper bearing 3, and the lower end of the spacer sleeve 7 abuts against the inner ring of the lower bearing 4. The round nut 8 is sleeved on the mandrel 2 and is threadedly connected to the mandrel 2. A lock washer 81 is provided at the lower end of the round nut 8. The lower end of the round nut 8 abuts against the inner ring of the upper bearing 3 through the lock washer 81, so that the upper bearing 3 is clamped between the round nut 8 and the spacer sleeve 7; an outwardly expanding flange 21 is provided at the lower end of the mandrel 2. The upper end of the flange 21 abuts against the inner ring of the lower bearing 4, so that the lower bearing 4 is clamped between the spacer sleeve 7 and the flange 21.

[0023] The upper bearing 3 includes two angular contact bearings, and the two angular contact bearings are stacked vertically and arranged back-to-back. The lower bearing 4 includes two angular contact bearings, and the two angular contact bearings are stacked vertically and arranged back-to-back. In another embodiment, the upper bearing 3 includes a plurality of deep groove ball bearings, and the deep groove ball bearings are stacked vertically.

[0024] A circular knitting machine includes the above-mentioned improved circular knitting machine sleeve structure.

[0025] The working principle of this improved circular knitting machine sleeve structure is as follows:

[0026] The heat generated by the operation of the circular knitting machine is transferred to the mandrel 2, causing the temperature of the mandrel 2 to rise. The mandrel 2 expands thermally and its length elongates. At this time, the lower bearing 4 provided at the lower section of the mandrel 2 is clamped and positioned by the upper end face of the lower oil seal seat 5 and the lower shoulder 11, so the lower end of the mandrel 2 is positioned. The upper bearing 3 at the upper section of the mandrel 2 is located between the lower end face of the upper oil seal seat 5 and the upper shoulder 11, and the distance between the lower end face of the upper oil seal seat 5 and the upper shoulder 11 is greater than the height of the upper bearing 3, that is, there is a vertical movement amount. Therefore, after the mandrel 2 is heated, it is in a state of elongating upward. The horizontal height position of the lower end of the mandrel 2 remains unchanged, and the center of the bead plate connected to the lower end of the mandrel 2 will not deviate, thereby ensuring that the distance between the upper needle plate installed on the bead plate and the lower needle cylinder remains unchanged, that is, ensuring the quality of the knitted fabric surface.

[0027] The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. An improved circular knitting machine sleeve structure, characterized in that: It includes a sleeve and a mandrel. The mandrel is arranged inside the sleeve. An upper bearing and a lower bearing are arranged between the mandrel and the sleeve to form a rotational connection. An upper shoulder with an upward-facing end surface is provided on the upper section of the inner wall of the sleeve. An upper oil seal seat is provided at the upper end of the sleeve. The upper bearing is arranged between the upper oil seal seat and the upper shoulder. The distance between the lower end surface of the upper oil seal seat and the upper shoulder is greater than the height of the upper bearing, so that the upper bearing has a vertical movement amount. A lower shoulder with a downward-facing end surface is provided on the lower section of the inner wall of the sleeve. A lower oil seal seat is provided at the lower end of the sleeve. The lower bearing is arranged between the lower oil seal seat and the lower shoulder. The lower bearing is clamped and positioned by the upper end surface of the lower oil seal seat and the lower shoulder.

2. The improved circular knitting machine sleeve structure according to claim 1, wherein: It further includes a spacer sleeve. The spacer sleeve is sleeved on the mandrel and is located between the upper bearing and the lower bearing. The upper end of the spacer sleeve abuts against the inner ring of the upper bearing, and the lower end of the spacer sleeve abuts against the inner ring of the lower bearing.

3. The improved circular knitting machine sleeve structure according to claim 2, wherein: It further includes a round nut. The round nut is sleeved on the mandrel and is threadedly connected to the mandrel. The lower end of the round nut abuts against the inner ring of the upper bearing, so that the upper bearing is clamped between the round nut and the spacer sleeve. An outwardly extending flange is provided at the lower end of the mandrel. The upper end of the flange abuts against the inner ring of the lower bearing, so that the lower bearing is clamped between the spacer sleeve and the flange.

4. The improved circular knitting machine sleeve structure according to claim 3, characterized in that: A lock washer is provided at the lower end of the round nut.

5. The improved circular knitting machine sleeve structure according to claim 1, wherein: The upper bearing includes two angular contact bearings. The two angular contact bearings are stacked vertically and arranged back-to-back.

6. The improved circular knitting machine sleeve structure according to claim 1, wherein: The upper bearing includes a plurality of deep groove ball bearings. Each deep groove ball bearing is stacked vertically.

7. The improved circular knitting machine sleeve structure according to claim 1, characterized in that: The lower bearing includes two angular contact bearings. The two angular contact bearings are stacked vertically and arranged back-to-back.

8. A circular knitting machine, characterized in that: An improved circular knitting machine sleeve structure according to any one of claims 1-7.

Images