A polytetrafluoroethylene wear sleeve for a boring machine bearing block

Abstract

The utility model discloses a polytetrafluoroethylene wear -resistant sleeve for boring machine bearing seat, it includes inner bush, the inner bush circumferential outer wall sleeve has the elastic sleeve, the circumferential outer wall of elastic sleeve upper half part is equipped with a plurality of first hollow hole, the circumferential outer wall of elastic sleeve lower half part is equipped with a plurality of second hollow hole, the circumferential outer wall sleeve of elastic sleeve has the outer sheath, the outer sheath circumferential outer wall integration is connected with a plurality of convex edge, this kind is used for boring machine bearing seat's polytetrafluoroethylene wear -resistant sleeve, through convex edge elastic sleeve cooperation structure design, has realized dynamic heat compensation and stable cooperation, has solved the precision instability problem that heat expansion led, simultaneously, the point line contact between convex edge and elastic sleeve and the netlike sinew of elastic sleeve itself, has provided efficient vibration damping and convenient maintenance, has solved the problem of rigid structure vibration transmission and inconvenient replacement.

Description

Technical Field

[0001] This utility model relates to the field of wear-resistant sleeve technology, specifically a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing. Background Technology

[0002] The boring machine bearing housing is a mechanical component used to support and fix the boring machine spindle bearing. Its core function is to ensure the stability and accuracy of the bearing under high-speed rotation or heavy load conditions. The PTFE wear-resistant sleeve, as a key component of the bearing housing, is mainly used to reduce friction, enhance wear resistance, and adapt to harsh working conditions.

[0003] Although this device has many beneficial effects, the following problems still exist: Existing wear-resistant sleeves for boring machine bearing housings are mostly rigid structures made of a single material and are fixedly connected to the bearing housing. During continuous operation, the frictional heat generated by the bearing causes the bearing, wear-resistant sleeve, and bearing housing to be at different temperatures. Due to the different thermal expansion coefficients of their materials, inconsistent thermal deformation occurs, leading to a smaller design clearance between the wear-resistant sleeve and the bearing, further resulting in abnormal wear and "shaft seizure." After restoration, the clearance increases, causing vibration and decreased accuracy. Secondly, traditional wear-resistant sleeves, as integral rigid components embedded in the bearing housing, lack effective vibration damping. During boring, especially during intermittent cutting, process vibrations are directly transmitted to the machine tool body through the wear-resistant sleeve, forming vibration marks on the surface of the machined hole and affecting surface quality. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] 1. Technical problems to be solved: To address the problems of insufficient thermal expansion compensation and poor vibration damping performance mentioned above, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing. Through the collaborative structural design of the convex rib elastic sleeve, dynamic thermal compensation and stable fit are achieved, solving the problem of precision instability caused by thermal expansion. At the same time, the point-line contact between the convex rib and the elastic sleeve, as well as the mesh ribs of the elastic sleeve itself, provide efficient vibration damping and convenient maintenance, solving the problem of inconvenient vibration transmission and replacement of rigid structures.

[0007] 2. Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: A polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing includes an inner liner, an elastic sleeve fitted around the outer circumference of the inner liner, a plurality of first hollow holes being formed on the outer circumference of the upper half of the elastic sleeve, a plurality of second hollow holes being formed on the outer circumference of the lower half of the elastic sleeve, and an outer sheath fitted around the outer circumference of the elastic sleeve, the outer sheath having a plurality of protruding ridges integrally formed on its outer circumference.

[0008] As a preferred embodiment of the polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention, the outer circumferential outer wall of the outer sleeve is provided with an oil injection hole, the inner circumferential inner wall of the outer sleeve is provided with an oil groove, and the bottom of the oil injection hole is connected to the oil groove.

[0009] As a preferred embodiment of the polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention, both the first hollow hole and the second hollow hole are rhomboid structures, and the diameter of the first hollow hole is larger than the diameter of the second hollow hole.

[0010] As a preferred embodiment of the polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention, the inner bushing has multiple storage grooves on its outer circumferential wall, and the multiple storage grooves are disposed between multiple protruding ridges.

[0011] As a preferred embodiment of the polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to this utility model, the cross-section of the convex ridge is an isosceles triangle structure, and the storage groove is an arc-shaped structure.

[0012] 3. Beneficial effects: Compared with the prior art, the beneficial effects of this utility model are: This type of PTFE wear-resistant sleeve for boring machine bearing housing achieves dynamic thermal compensation and stable fit through a synergistic structure composed of convex ribs and elastic sleeve. When the inner sleeve expands due to bearing heat, the convex ribs on it concentrate the expansion force to the mesh structure of the elastic sleeve, driving it to undergo elastic deformation and providing radial expansion space for the inner sleeve. When cooling, the restoring force of the elastic sleeve supports the inner sleeve to return to its original position through the convex ribs. This dynamic compensation mechanism, triggered by the convex ribs and executed by the elastic sleeve, automatically maintains the working clearance between the bearing and the wear-resistant sleeve, thereby solving the problems of precision instability and accelerated wear caused by thermal deformation. This type of PTFE wear-resistant sleeve for boring machine bearing housings has several advantages. First, in terms of vibration damping, the point / line contact of the raised ribs transforms the broadband vibration transmitted from the bearing into multiple concentrated impact points on the elastic sleeve's mesh ribs. This design optimizes and activates the damping potential of the elastic sleeve, enabling it to effectively convert vibration energy into heat energy and dissipate it, thereby reducing the vibration transmitted to the machine tool and improving machining quality. Second, in terms of maintenance, the separate design of the inner bushing and the elastic sleeve allows for individual replacement of the inner bushing when only it wears, without disassembling the entire bearing housing assembly. This greatly simplifies the maintenance process and reduces costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the overall structure of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention. Figure 2 This is a front view of the overall structure of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention. Figure 3 This is a schematic diagram of the outer sheath structure of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention. Figure 4 This is a schematic diagram of the elastic sleeve structure of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention. Figure 5 This is a schematic diagram of the inner bushing structure of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to the present invention.

[0014] The labels in the diagram are as follows: 1. Outer sleeve; 2. Elastic sleeve; 3. Inner liner; 4. Oil injection hole; 5. Oil groove; 6. First perforated hole; 7. Second perforated hole; 8. Oil reservoir; 9. Raised ridge. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0017] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0020] This utility model provides an overall structural schematic diagram of an embodiment of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing, including: Please see Figures 1-5This embodiment of a PTFE wear-resistant sleeve for a boring machine bearing housing includes an inner sleeve 3, which serves as the main friction surface and directly contacts the outer ring of the bearing. Utilizing its low coefficient of friction and self-lubricating properties, it reduces wear. The inner sleeve 3 is made of PTFE. An elastic sleeve 2 is fitted around the outer circumference of the inner sleeve 3. This elastic sleeve 2, through its mesh-like elastic structure, automatically compensates for thermal expansion and effectively dampens operational vibrations. The spring sleeve 2 is made of 60Si2Mn spring steel. The upper half of the elastic sleeve 2 has multiple first hollow holes 6 on its outer circumference to provide greater elastic deformation space in non-primary load-bearing areas, optimizing the thermal compensation effect. The lower half of the elastic sleeve 2 has multiple second hollow holes 7 on its outer circumference to provide greater elastic deformation space in the primary load-bearing areas. The outer sleeve 2 provides stronger support rigidity, preventing excessive displacement of the bearing due to pressure and ensuring the rotational accuracy of the spindle. The outer sleeve 1 is fitted onto the outer circumferential wall of the elastic sleeve 2, which mainly serves as the mounting base for the entire wear-resistant sleeve. It is fixed to the external bearing housing through an interference fit, providing the main structural rigidity and installation accuracy. The outer sleeve 1 is made of QT500 ductile iron. The outer circumferential wall of the outer sleeve 1 is integrally formed with multiple protruding ridges 9, which serve as support points between the inner sleeve 3 and the elastic sleeve 2, transferring the bearing load to the elastic sleeve 2. At the same time, it greatly reduces the contact area, preventing the PTFE material from undergoing permanent deformation and loosening under full-area contact pressure due to "cold flow". It also allows the inner sleeve 3 to slide slightly along the protruding ridges 9 under thermal stress, releasing thermal stress.

[0021] It is worth noting that, in order to facilitate the injection of grease, the outer circumferential outer wall of the outer sheath 1 is provided with an oil injection hole 4 for injecting grease during initial installation to reduce initial friction and can also serve as a supplementary lubrication channel for later maintenance. The inner circumferential inner wall of the outer sheath 1 is provided with an oil groove 5 for storing initial grease and ensuring uniform lubrication through circumferential distribution. The bottom of the oil injection hole 4 is connected to the oil groove 5.

[0022] Next, in order to effectively reduce vibration while providing rigid support, specifically, both the first hollow hole 6 and the second hollow hole 7 are rhomboid structures, and the diameter of the first hollow hole 6 is larger than the diameter of the second hollow hole 7.

[0023] Meanwhile, in order to improve the lubrication of the wear-resistant sleeve, specifically, the outer circumference of the inner bushing 3 is provided with multiple storage grooves 8 for storing solid lubricant, which is slowly released during operation to achieve long-term self-lubrication and reduce dependence on external lubrication. The multiple storage grooves 8 are located between multiple protruding ridges 9.

[0024] Finally, in order to reduce stress concentration between the inner liner 3 and the elastic sleeve 2, specifically, the cross-section of the convex rib 9 is an isosceles triangle structure. The isosceles triangle structure can reduce the contact area and allow micro-sliding. Moreover, the triangle has good stability and can effectively transfer the load. The storage tank 8 has an arc-shaped structure, which facilitates the filling and injection of lubricant. In addition, the bottom of the arc-shaped tank has no sharp edges and corners, which makes it less likely to generate stress concentration.

[0025] In addition, the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the internal structure and method. Combination Figures 1-5 The specific usage process of a polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing according to this embodiment is as follows: 1. First, carefully press the inner bushing 3 into the inner hole of the elastic sleeve 2, ensuring that the protrusion 9 is in good contact with the inner wall of the elastic sleeve 2. Then, press the assembled elastic sleeve 2 assembly into the outer sheath 1 with an interference fit. Finally, press the entire wear-resistant sleeve assembly with the outer sheath 1 facing outward into the designated mounting hole of the boring machine bearing seat using a pressure device to complete the fixing. 2. After installation, inject sufficient high-temperature grease into the oil groove 5 through the oil injection hole 4 on the outer sleeve 1 until the grease slightly overflows from the gap between the inner bushing 3 and the bearing. Start the equipment for no-load break-in operation. After the operation is stable, it can be put into normal boring operation. The frictional heat and vibration generated during the operation of the equipment will be automatically compensated and absorbed by the internal elastic sleeve 2 structure. 3. If the machining accuracy decreases or the gap is too large after long-term use, grease can be added through the oil filling hole 4. When the wear-resistant sleeve needs to be replaced, simply press out the entire old component from the bearing housing and replace it with the new component. Since the inner bushing 3 and the elastic sleeve 2 are designed separately, the worn inner bushing 3 can also be replaced separately in extreme cases. The maintenance cost is low and the operation is simple.

[0026] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A polytetrafluoroethylene wear-resistant sleeve for a boring machine bearing housing, characterized in that, Includes an inner liner (3), on which an elastic sleeve (2) is fitted around the outer circumference of the inner liner (3). The outer circumference of the upper half of the elastic sleeve (2) has multiple first hollow holes (6), and the outer circumference of the lower half of the elastic sleeve (2) has multiple second hollow holes (7). The outer circumference of the elastic sleeve (2) is fitted around an outer sheath (1), and the outer circumference of the outer sheath (1) is integrally formed with multiple protruding ridges (9).

2. The PTFE wear-resistant sleeve for a boring machine bearing housing according to claim 1, characterized in that, The outer wall of the outer sheath (1) is provided with an oil injection hole (4), and the inner wall of the outer sheath (1) is provided with an oil groove (5). The bottom of the oil injection hole (4) is connected to the oil groove (5).

3. The PTFE wear-resistant sleeve for a boring machine bearing housing according to claim 2, characterized in that, Both the first hollow hole (6) and the second hollow hole (7) are rhomboid structures, and the diameter of the first hollow hole (6) is larger than the diameter of the second hollow hole (7).

4. The PTFE wear-resistant sleeve for a boring machine bearing housing according to claim 3, characterized in that, The inner liner (3) has multiple storage grooves (8) on its outer circumference, and the multiple storage grooves (8) are arranged between the multiple protruding ridges (9).

5. The PTFE wear-resistant sleeve for a boring machine bearing housing according to claim 4, characterized in that, The cross-section of the protruding ridge (9) is an isosceles triangle structure, and the storage tank (8) is an arc-shaped structure.

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