A LEG type sliding shoe support and its manufacturing process

Abstract

The invention discloses a LEG type sliding shoe bearing and a manufacturing process thereof, and specifically relates to the technical field of sliding shoe bearings. The technical scheme is as follows: comprising a sliding shoe bearing, the sliding shoe bearing is composed of a tin-based babbitt alloy layer and a bearing matrix, the tin-based babbitt alloy layer is clad on the bearing matrix by arc deposition, and the thickness of the tin-based babbitt alloy layer is set to 3-4mm; a sliding shoe bearing inner hole is provided on the inner wall at the top end of the bearing matrix; a high-pressure oil lifting oil cavity is provided on the inner wall at the top end of the middle part of the bearing matrix. The beneficial effects of the invention are as follows: the bonding strength of traditional centrifugal casting is about 35Mpa, the thinner alloy layer reduces the load deformation and has higher strength, the alloy hardness after welding is higher, the wear resistance is higher, the power loss is reduced, the flow channel for direct lubrication oil supply is designed, insufficient lubrication oil is avoided, the cold oil lubrication efficiency is improved, the lubrication performance of the sliding shoe bearing is improved, and the temperature rise is reduced.

Description

Technical Field

[0001] The invention relates to the field of sliding shoe bearings, and in particular to a LEG type sliding shoe bearing and a manufacturing process thereof. Background Art

[0002] Ball mill is a key equipment for crushing materials after crushing. Sliding shoe bearing is an indispensable mechanical component of crushing and grinding ball mill in mining, building materials, chemical industry and metallurgical machinery. It plays an important supporting role for the entire large ball mill equipment. As one of the most important load-bearing parts in the entire ball mill, the performance of sliding shoe bearing directly affects the service life and operating efficiency of the ball mill, and even affects the operating safety of the whole machine. The new generation of sliding shoe bearing adopts direct lubrication technology LEG.

[0003] The existing technology has the following deficiencies: 1. The sliding shoe bearing is mostly made of lead-based Babbitt alloy, with a thickness of more than 8-10 mm, compounded on a cast steel matrix, and belongs to a bimetallic sliding bearing. Since the sliding shoe bearing has an irregular shape and a large shape, the compounding of the Babbitt alloy is the most traditional gravity casting method, so the combination of the alloy and the matrix is ​​not ideal;

[0004] 2. During on-site installation, the contact surface and side clearance between the traditional structure of the sliding shoe support and the sliding track are often scraped and polished repeatedly by manpower, which is time-consuming and labor-intensive. The entire installation process is cumbersome, difficult to install, and has high installation costs.

[0005] 3. During product use, the traditional support bearing setting uses external oil spraying or oil ring to supplement the lubricating oil, and its lubrication performance is poor. If the scraping quality of the product is poor, it often causes temperature rise failure.

[0006] Therefore, it is necessary to invent a LEG type sliding shoe support and its manufacturing process. Summary of the invention

[0007] To this end, the present invention provides a LEG type sliding shoe support and a manufacturing process thereof, wherein the product is replaced with a tin-based bus and alloy with better performance, and the new process adopts an arc deposition process to melt the alloy on the surface of the steel part in a welding wire state, so as to improve the bonding between the alloy and the steel matrix, reduce the alloy layer, reduce the deformation of the alloy after being loaded, and improve the bearing capacity and strength of the support;

[0008] Then, the new product structure is based on fluid lubrication calculation, and the elliptical bearing line shape with improved lubrication performance is designed to enhance the fluid dynamic pressure lubrication effect. At the same time, the contact surface and installation side clearance between the sliding shoe support shoe and the sliding track are guaranteed by design and processing with machining accuracy.

[0009] Finally, by adding a direct lubrication flow channel design to the new structure, the high-pressure oil circuit relies on high-pressure oil to lift the shaft before the whole machine is running to avoid scratching the bearing alloy due to inert boundary lubrication when the speed is too low in the early stage of starting. After the whole machine starts and runs balanced, the high-pressure oil circuit is closed and the low-pressure oil circuit is forced to supply oil to always achieve an efficient lubrication state, so as to solve the problems of unsatisfactory bonding between the alloy and the matrix, cumbersome installation process, high installation difficulty and cost, and poor lubrication performance.

[0010] In order to achieve the above object, the present invention provides the following technical solutions: a LEG type sliding shoe bearing, comprising a sliding shoe bearing, wherein the sliding shoe bearing is composed of a tin-based babbitt alloy layer and a bearing substrate, wherein the tin-based babbitt alloy layer is clad on the bearing substrate by arc deposition, and the thickness of the tin-based babbitt alloy layer is set to 3-4 mm;

[0011] The inner wall at the top end of the bearing base is provided with a sliding shoe inner hole;

[0012] A high-pressure oil lifting oil cavity is provided on the inner wall at the top of the middle part of the bearing base, a high-pressure oil joint is provided on the top of the middle part of the bearing base, a high-pressure oil flow channel is provided on one end of the inner wall of the bearing base, the high-pressure oil lifting oil cavity is connected with the high-pressure oil joint, and the high-pressure oil lifting oil cavity is connected with the high-pressure oil flow channel;

[0013] A low-pressure oil interface is provided at one end of the inner wall of the bearing base, a low-pressure oil flow channel is provided at one end of the inner wall of the bearing base, an oil groove is provided at one end of the inner wall of the bearing base, the low-pressure oil interface is connected with the low-pressure oil flow channel, and the low-pressure oil flow channel is connected with the oil groove.

[0014] Preferably, an oil inlet wedge is provided on the inner wall of the top right side of the bearing base.

[0015] Preferably, the sliding shoe shoe adopts an elliptical shoe structure.

[0016] Preferably, the center of the inner hole of the sliding shoe support bearing is offset from the center of the sliding track, and the size of the inner hole of the sliding shoe support bearing adopts the grade 1 precision requirement.

[0017] Preferably, the size of the inner hole of the sliding shoe is determined by machining.

[0018] Preferably, the fitting clearance between the inner hole of the sliding shoe bearing and the main engine sliding shoe shaft is set to 1.5-3‰.

[0019] Preferably, the surface roughness of the inner hole of the sliding shoe is required to be above 0.8 μm through machining.

[0020] Preferably, the bearing matrix is ​​made of cast steel.

[0021] A manufacturing process of a LEG type sliding shoe shoe includes the following specific steps:

[0022] S1, cladding a tin-based babbitt alloy layer on a bearing substrate by arc deposition, wherein the thickness of the tin-based babbitt alloy layer is set to 3-4 mm;

[0023] S2, and then determine the size of the inner hole of the sliding shoe bearing by machining, and set the matching clearance between the inner hole of the sliding shoe bearing and the sliding shoe shaft of the main engine to 1.5-3‰, and then machine the surface of the inner hole of the sliding shoe bearing to a roughness requirement of more than 0.8μm, where the center of the inner hole of the sliding shoe bearing is offset from the center of the sliding track, and the size adopts the 7-level accuracy requirement;

[0024] S3, after that, a high-pressure oil lifting oil chamber, a high-pressure oil joint, a high-pressure oil flow channel, a low-pressure oil interface, an oil inlet wedge, a low-pressure oil flow channel and an oil tank are sequentially opened on the sliding shoe support;

[0025] S4, before starting, the high-pressure oil lifting oil chamber is connected with the high-pressure oil joint and the high-pressure oil flow channel, and then the high-pressure oil is supplied by the external high-pressure oil pump to form a static pressure oil film in the high-pressure oil lifting oil chamber to lift the shaft, thereby avoiding scratching the bearing alloy due to inert boundary lubrication at the early stage of starting when the speed is too low;

[0026] S5, when the whole machine starts and runs in balance, close the high-pressure oil circuit, and the low-pressure oil enters the oil tank through the low-pressure oil interface and the flow channel. An oil inlet wedge is set on the sliding shoe support surface to ensure smooth oil inflow and form an optimal dynamic pressure oil film, so as to achieve forced oil supply in the low-pressure oil circuit and always achieve efficient lubrication. Design a cooling water channel and supply circulating water to reduce the operating temperature of the sliding shoe support.

[0027] The beneficial effects of the present invention are:

[0028] 1. The traditional gravity casting alloy process is changed to the use of robot welding equipment and arc deposition process to clad the alloy. The bonding performance with the steel matrix is ​​better, and the bonding strength can reach 75Mpa. The bonding strength of traditional centrifugal casting is about 35Mpa. The thinner alloy layer reduces the load deformation and has higher strength. The alloy hardness after welding is higher, with higher wear resistance and reduced power loss;

[0029] 2. The sliding shoe support shoe and the sliding shoe shaft adopt a large clearance fit, the support shoe adopts an elliptical shoe structure, the center of the inner hole of the sliding shoe support shoe is offset from the center of the sliding track, and the contact surface and contact angle between the sliding shoe support shoe and the sliding shoe shaft as well as the matching side clearance are guaranteed by design profile and machining, which can directly replace manual scraping, reduce assembly cycle and installation cost, and the design profile of the inner hole elliptical shoe greatly improves the dynamic pressure lubrication effect;

[0030] 3. High and low pressure dual oil circuit structure, designed high pressure oil lifting structure, lifting the shaft before starting to avoid inert lubrication scratching the alloy during starting, designed direct lubrication oil flow channel supply to avoid insufficient lubrication oil, improve cold oil lubrication efficiency, improve the lubrication performance of the sliding shoe support, and reduce temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic front view of the structure provided by the present invention;

[0032] Figure 2 A schematic top view of the structure provided by the present invention;

[0033] Figure 3 A front view schematic diagram of the low-pressure oil interface structure provided by the present invention;

[0034] Figure 4 A front view schematic diagram of the oil inlet wedge structure provided by the present invention;

[0035] Figure 5 A bottom view schematic diagram of the three-dimensional structure provided by the present invention;

[0036] Figure 6 This is a front view schematic diagram of the three-dimensional structure provided by the present invention.

[0037] In the figure: tin-based babbitt alloy layer 1, bearing base 2, sliding shoe support inner hole 3, high-pressure oil lifting oil chamber 4, high-pressure oil joint 5, high-pressure oil flow channel 6, low-pressure oil interface 7, oil inlet wedge 8, sliding shoe support 10. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] See attached Figure 1-Figure 6 The present invention provides a LEG type sliding shoe and a manufacturing process thereof, including a sliding shoe 10;

[0040] Furthermore, the sliding shoe 10 is composed of a tin-based babbitt alloy layer 1 and a bearing substrate 2. The tin-based babbitt alloy layer 1 is clad on the bearing substrate 2 by arc deposition. The thickness of the tin-based babbitt alloy layer 1 is set to 3-4 mm. Specifically, the thickness of the tin-based babbitt alloy layer 1 is preferably 3.5 mm.

[0041] Furthermore, a sliding shoe inner hole 3 is formed on the inner wall of the top end of the bearing base 2 .

[0042] Furthermore, a high-pressure oil lifting oil chamber 4 is provided on the inner wall at the top middle part of the bearing base 2, a high-pressure oil joint 5 is opened at the top middle part of the bearing base 2, a high-pressure oil flow channel 6 is opened at one end of the inner wall of the bearing base 2, the high-pressure oil lifting oil chamber 4 is communicated with the high-pressure oil joint 5, the high-pressure oil lifting oil chamber 4 is communicated with the high-pressure oil flow channel 6, specifically, the high-pressure oil is supplied by an external high-pressure oil pump, and the high-pressure oil has the function of forming a static pressure oil film in the high-pressure oil lifting oil chamber 4 to lift the shaft.

[0043] Furthermore, a low-pressure oil interface 7 is opened at one end of the inner wall of the bearing base 2, a low-pressure oil flow channel is opened at one end of the inner wall of the bearing base 2, an oil groove is opened at one end of the inner wall of the bearing base 2, the low-pressure oil interface 7 is connected with the low-pressure oil flow channel, and the low-pressure oil flow channel is connected with the oil groove.

[0044] Furthermore, an oil inlet wedge 8 is provided on the inner wall of the right top end of the bearing base 2 .

[0045] Furthermore, the sliding shoe support shoe 10 adopts an elliptical shoe structure.

[0046] Furthermore, the center of the inner hole 3 of the sliding shoe support bearing is offset from the center of the sliding track, and the size of the inner hole 3 of the sliding shoe support bearing adopts the 7th level precision requirement.

[0047] Furthermore, the size of the inner hole 3 of the sliding shoe is determined by machining. Specifically, machining is the abbreviation of mechanical processing, which refers to a processing technology for removing materials through precise mechanical processing.

[0048] Furthermore, the fitting clearance between the inner hole 3 of the sliding shoe bearing and the sliding shoe shaft of the main machine is set to 1.5%-3%. Specifically, the fitting clearance between the inner hole 3 of the sliding shoe bearing and the sliding shoe shaft of the main machine is preferably 2.25‰.

[0049] Furthermore, the surface roughness of the inner hole 3 of the sliding shoe is required to be above 0.8 μm through machining.

[0050] Furthermore, the bearing base 2 is made of cast steel. Specifically, cast steel refers to steel material specially used for manufacturing steel castings.

[0051] The use process of the present invention is as follows: when using the present invention, a tin-based babbitt alloy layer 1 is melted onto a bearing substrate 2 by arc deposition, and the thickness of the tin-based babbitt alloy layer 1 is set to 3-4 mm, and then the size of the inner hole 3 of the sliding shoe support shoe is determined by machining, and the matching clearance between the inner hole 3 of the sliding shoe support shoe and the main machine sliding shoe shaft is set to 1.5-3‰, and then the surface of the inner hole 3 of the sliding shoe support shoe is machined to a roughness requirement of more than 0.8 μm, wherein the center of the inner hole 3 of the sliding shoe support shoe is offset from the center of the sliding track, and the size adopts the 7-level precision requirement, and then a high-pressure oil lifting oil chamber 4, a high-pressure oil joint 5, a high-pressure oil flow channel 6, a low-pressure oil interface 7, an oil inlet wedge 8, and a low-pressure oil flow channel (not marked in the figure) are opened on the sliding shoe support shoe 10 in sequence. ) and the oil tank (not marked in the figure). Before starting, the high-pressure oil lifts the oil chamber 4 and penetrates the high-pressure oil joint 5, and penetrates the high-pressure oil flow channel 6. Then the high-pressure oil is supplied by an external high-pressure oil pump to form a static pressure oil film in the high-pressure oil lift oil chamber 4 to lift the shaft, thereby avoiding the scratching of the bearing alloy due to inert boundary lubrication due to the low speed in the early stage of starting. When the whole machine starts and runs balanced, the high-pressure oil circuit is closed, and the low-pressure oil enters the oil tank (not marked in the figure) through the low-pressure oil interface 7 and the flow channel (not marked in the figure). An oil inlet wedge 8 is set on the sliding shoe support surface to ensure smooth oil inlet and form an optimal dynamic pressure oil film, so as to achieve forced oil supply in the low-pressure oil circuit and always achieve efficient lubrication. A cooling water channel is designed to supply circulating water to reduce the operating temperature of the sliding shoe support 10.

[0052] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A manufacturing process of a LEG type sliding shoe support, characterized in that: The LEG type sliding shoe bearing comprises a sliding shoe bearing (10), wherein the sliding shoe bearing (10) is composed of a tin-based babbitt alloy layer (1) and a bearing base (2), wherein the tin-based babbitt alloy layer (1) is clad on the bearing base (2) by arc deposition, and the thickness of the tin-based babbitt alloy layer (1) is set to 3-4 mm; The inner wall of the top end of the bearing base (2) is provided with a sliding shoe bearing inner hole (3); A high-pressure oil lifting oil chamber (4) is provided on the inner wall of the top middle portion of the bearing base (2); a high-pressure oil joint (5) is provided on the top middle portion of the bearing base (2); a high-pressure oil flow channel (6) is provided on one end of the inner wall of the bearing base (2); the high-pressure oil lifting oil chamber (4) is connected to the high-pressure oil joint (5); and the high-pressure oil lifting oil chamber (4) is connected to the high-pressure oil flow channel (6); A low-pressure oil interface (7) is provided at one end of the inner wall of the bearing base (2), a low-pressure oil flow channel is provided at one end of the inner wall of the bearing base (2), an oil groove is provided at one end of the inner wall of the bearing base (2), the low-pressure oil interface (7) is connected to the low-pressure oil flow channel, and the low-pressure oil flow channel is connected to the oil groove; An oil inlet wedge (8) is provided on the inner wall of the top right side of the bearing base (2); The specific steps of the manufacturing process are as follows: S1, cladding a tin-based babbitt alloy layer (1) on a bearing substrate (2) by arc deposition, wherein the thickness of the tin-based babbitt alloy layer (1) is set to be 3-4 mm; S2, and then determine the size of the inner hole (3) of the sliding shoe bearing by machining, and set the matching clearance between the inner hole (3) of the sliding shoe bearing and the sliding shoe shaft of the main machine to 1.5-3‰, and then machine the surface of the inner hole (3) of the sliding shoe bearing to a roughness requirement of more than 0.8μm, wherein the center of the inner hole (3) of the sliding shoe bearing is offset from the center of the sliding track, and the size adopts the 7-level precision requirement; S3, after which a high-pressure oil lifting oil chamber (4), a high-pressure oil joint (5), a high-pressure oil flow channel (6), a low-pressure oil interface (7), an oil inlet wedge (8), a low-pressure oil flow channel and an oil groove are sequentially opened on the sliding shoe support (10); S4, before starting, the high-pressure oil lifting oil chamber (4) is connected to the high-pressure oil joint (5) and the high-pressure oil flow channel (6), and then the high-pressure oil is supplied by an external high-pressure oil pump to form a static oil film in the high-pressure oil lifting oil chamber (4) to lift the shaft, thereby avoiding scratching of the bearing alloy due to inert boundary lubrication caused by too low speed in the early stage of starting; S5, when the whole machine starts and runs in balance, the high-pressure oil circuit is closed, and the low-pressure oil enters the oil tank through the low-pressure oil interface (7) and the flow channel. An oil inlet wedge (8) is set on the sliding shoe support surface to ensure smooth oil inflow and form an optimal dynamic pressure oil film, so as to achieve forced oil supply in the low-pressure oil circuit and always achieve efficient lubrication. A cooling water channel is designed to supply circulating water to reduce the operating temperature of the sliding shoe support (10).

2. The manufacturing process of a LEG type sliding shoe support according to claim 1 is characterized in that: The sliding shoe support shoe (10) adopts an elliptical shoe structure.

3. The manufacturing process of a LEG type sliding shoe shoe according to claim 1 is characterized in that: The bearing base (2) is made of cast steel.

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