A real-time positioning device for slide shoe bearings of dry ball mills and a method of using the same
By designing limiting studs and flexible limiting blocks, the degrees of freedom of the convex and concave balls of the dry ball mill sliding bearing are restricted. Combined with the establishment of a lubricating oil film, the problems of eccentricity and misalignment of the bearing pads and axial movement of the cylinder are solved, thereby improving the stability and lifespan of the equipment and reducing the equipment failure rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CITIC HEAVY INDUSTRIES CO LTD
- Filing Date
- 2023-08-08
- Publication Date
- 2026-07-07
AI Technical Summary
During installation and operation, the sliding track bearings of dry ball mills are prone to eccentricity and misalignment of the bearing pads, resulting in uneven local stress, high friction, increased bearing temperature, and equipment shutdown. Furthermore, axial movement of the cylinder causes severe wear of the bearing limiting device, affecting the stability and lifespan of the equipment.
The system employs a limiting stud, a limiting nut, a flexible limiting block, and a piping system. By engaging the limiting stud with the limiting hole of the bearing, the freedom of the convex and concave spheres is restricted. Combined with the design of the flexible limiting block and oil groove, a stable oil film is established to prevent axial movement of the cylinder and splashing of lubricating oil.
It improves the installation accuracy of the bearings and the stability of the cylinder operation, prevents the bearing temperature from rising, extends the service life of the equipment, increases the equipment operating rate, and reduces labor intensity and production costs.
Smart Images
Figure CN117189789B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of dry ball mill technology, and in particular to a real-time positioning device for a sliding bearing of a dry ball mill and its usage method. Background Technology
[0002] Dry ball mills are the most common and widely used grinding equipment in industries such as mining, building materials, chemicals, and metallurgy. The sliding track bearings, as key components of dry ball mills, are crucial to the smooth operation of the mill, and their installation accuracy and positioning reliability are vital factors. Because the convex and concave balls of the ball mill sliding track bearings have spherical contact, excessive freedom during bearing pad installation can lead to inaccurate positioning and bearing eccentricity. This uneven stress on the bearing pads can even cause excessive local friction, resulting in overheating, equipment shutdowns, and bearing failure. Furthermore, during mill operation, thermal expansion causes axial movement of the mill cylinder, resulting in severe wear of the bearing positioning device and rapid bearing temperature rise, leading to frequent shutdowns and unstable equipment operation.
[0003] Therefore, positioning is required during bearing installation and operation to limit the range of motion of the convex and concave balls, limit the self-aligning range of the bearing pads, and limit the axial movement of the mill cylinder. This improves the installation accuracy of the bearing pads and the stability of the mill cylinder operation. It is crucial for eliminating eccentricity and misalignment during mill cylinder installation, avoiding uneven stress on the bearing pads and temperature rise caused by mill cylinder movement, extending the service life of the mill, and improving the equipment operating rate. The quality of its performance directly affects the operating rate of the equipment. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a real-time positioning device for the sliding bearing of a dry ball mill and its usage method, so as to avoid axial movement of the cylinder during operation, prevent the bearing temperature from rising and burning, and improve the operating rate of the equipment.
[0005] The technical solution adopted in this invention is:
[0006] A real-time positioning device for a dry ball mill sliding bearing includes a limiting stud, a limiting nut, a flexible limiting block, and a piping system;
[0007] The upper end of the limiting stud is a smooth section, and the lower end is a threaded section. An annular groove is provided at the junction of the smooth section and the threaded section. Two limiting studs are set on the upper surface of the ball seat of the sliding bearing through the threaded section. The two limiting studs are symmetrically arranged along the center of the ball seat. Limiting nuts are respectively set on the two limiting studs. The limiting nuts are in contact with the ball seat to further strengthen the limiting studs. Two limiting holes corresponding to the limiting studs are provided on the bottom surface of the bearing pad. The upper end of the limiting stud mates with the corresponding limiting holes.
[0008] The flexible limiting block is an arc-shaped plate structure that matches the outer edge of the bearing. It has several mounting holes at the bottom and several guide grooves spaced vertically on its inner surface. This facilitates timely discharge of lubricating oil when the volume is large, preventing splashing and environmental pollution. The flexible limiting block is symmetrically positioned on both sides of the outer edge near the upper surface of the bearing, extending above it. Two oil grooves are located on the inner surface of the extended portion, corresponding to the outer edge of the cylinder slip ring on the bearing. Each of the two corresponding oil grooves within the flexible limiting block has an oil passage connecting to it. The oil passage inlet is located at the lower end of the flexible limiting block. The oil outlet of the pipeline system is connected to the oil passage inlet, and the oil inlet of the pipeline system passes through the cover and connects to the lubrication system.
[0009] Specifically, the length of the threaded section of the limiting stud is greater than the length of the smooth section, and the outer diameter is also greater than the outer diameter of the smooth section. The depth of the threaded hole on the ball seat for installing the threaded section is 15-20mm greater than the length of the threaded section.
[0010] Specifically, the inner surface of the flexible limiting block and the oil groove are provided with a Babbitt alloy layer to reduce hard friction and play a buffering role.
[0011] A method for using a real-time positioning device for a dry ball mill sliding bearing, comprising the following steps:
[0012] Step 1: First, install the concave ball on the ball seat of the sliding track bearing, and at the same time install the bearing pad and the convex ball through the center stud; install the limit nuts on the threaded section of the limit stud respectively, and then install the two limit studs into the threaded holes on the ball seat through the threaded section respectively, with the lower end face of the limit nut in contact with the upper surface of the ball seat.
[0013] Step 2: After aligning the position of the limiting stud with the limiting hole on the bearing plate, install the bearing plate and convex ball installed in Step 1 onto the concave ball, with the convex ball and concave ball in contact. Insert the smooth section of the limiting stud into the limiting hole of the bearing plate. Make local adjustments to the convex ball and concave ball to ensure that the gap between the limiting stud and the limiting hole is uniform.
[0014] Step 3: After the positioning stud is installed, slowly lower the cylinder onto the bearing pad. The positioning stud restricts the freedom of the convex and concave spheres, thus ensuring the accuracy of the cylinder installation. After installing the cylinder, screw the positioning stud further downward into the threaded hole of the ball seat. When the lower surface of the annular groove of the positioning stud coincides with the position of the positioning nut, the upper smooth section of the positioning stud is completely disengaged from the positioning hole of the bearing pad, maintaining the normal operating distance of the bearing pad. This releases the positioning restriction of the positioning stud, restores the self-aligning function of the bearing, and avoids local rigid friction during the operation of the cylinder.
[0015] Step 4: Using bolts, install the two flexible limiting blocks on the outer sides of the bearing and the cylinder slip ring respectively through the mounting holes, leaving a gap of 0.15-0.2mm between the flexible limiting blocks and the cylinder slip ring; connect the pipeline system to the oil inlet at the lower end of the flexible limiting block; during mill operation, continuously supply lubricating oil through the lubrication station to form a stable oil film between the outer edge of the cylinder slip ring and the flexible limiting block.
[0016] Due to the adoption of the technical solution described above, the present invention has the following advantages:
[0017] This invention, through the positioning of the limiting stud and the upper positioning hole of the bearing, restricts the degrees of freedom of the convex and concave spheres and limits the self-aligning range of the bearing. This ensures that the bearing does not become eccentric or tilted during the installation and mating of the cylinder, improving the installation accuracy of the bearing and the stability of the cylinder operation, extending the service life of the mill, increasing equipment operating rate, shortening worker installation time, and improving labor efficiency. The flexible limiting block is equipped with oil channels and oil grooves to continuously input lubricating oil, establishing a stable oil film between the flexible limiting block and the cylinder slip ring to prevent axial movement of the cylinder, ensuring the normal operation of the mill cylinder, and preventing equipment shutdown caused by high bearing temperature due to rigid friction between the cylinder and the limiting block. The oil guide groove plays a role in lubrication and oil guidance, avoiding excessive splashing of lubricating oil on the bearing surface and causing oil contamination. The overall structure is reasonably designed, highly compatible, and has strong applicability. It has the characteristics of versatility, interchangeability, low production cost, and low labor intensity. Attached Figure Description
[0018] Figure 1 This is a cross-sectional view of the installation of the present invention.
[0019] Figure 2 This is a schematic diagram of the flexible limiting block of the present invention.
[0020] Figure 3 yes Figure 2 A schematic diagram of BB.
[0021] Figure 4 yes Figure 2 A schematic diagram of direction D.
[0022] In the diagram: 1-ball seat, 2-threaded hole, 3-limit nut, 4-limit stud, 5-limit hole, 6-bearing plate, 7-slip ring, 8-flexible limit block, 9-oil groove, 91-oil passage, 10-bolt, 11-guide groove, 12-piping system, 13-convex ball, 14-concave ball. Detailed Implementation
[0023] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.
[0024] Combined with appendix Figure 1-4 The device shown is a real-time positioning device for a dry ball mill sliding bearing, including a limiting stud 4, a limiting nut 3, a flexible limiting block 8, and a pipeline system 12.
[0025] The upper end of the limiting stud 4 is a smooth section, and the lower end is a threaded section. An annular groove is provided at the junction of the smooth section and the threaded section. The length of the threaded section of the limiting stud 4 is greater than the length of the smooth section, and the outer diameter is also greater than the outer diameter of the smooth section. The depth of the threaded hole 2 on the ball seat 1 for installing the threaded section is 15-20mm greater than the length of the threaded section. The two limiting studs 4 are set on the upper end face of the ball seat 1 of the sliding bearing through the threaded section. The two limiting studs 4 are symmetrically arranged around the center of the ball seat 1. The limiting nuts 3 are respectively set on the two limiting studs 4. The limiting nuts 3 are in contact with the ball seat 1 to further strengthen the limiting studs 4. The bottom surface of the bearing pad 6 is provided with two limiting holes 5 corresponding to the limiting studs 4. The upper end of the limiting stud 4 is engaged with the corresponding limiting hole 5.
[0026] The flexible limiting block 8 is an arc-shaped plate structure that matches the outer edge of the jack 6. Several mounting holes are provided at the bottom, and several guide grooves 11 are spaced vertically along the inner side. This facilitates timely discharge of lubricating oil when the amount is large, preventing splashing and environmental pollution. The flexible limiting block 8 is symmetrically positioned on both sides of the outer edge near the upper end face of the jack 6 through the mounting holes, extending above the upper end face of the jack 6. Two oil grooves 9 are provided on the inner side of the extended portion, corresponding to the outer edge of the cylinder slip ring 7 on the jack 6. A Babbitt alloy layer is provided on the inner side of the flexible limiting block 8 and inside the oil grooves 9 to reduce hard friction and provide a buffering effect. Oil passages 91 are provided in the flexible limiting block 8 corresponding to the two oil grooves 9, connecting to the oil grooves 9. The inlet of the oil passage 91 is located at the lower end of the flexible limiting block 8. The oil outlet of the pipeline system 12 is connected to the inlet of the oil passage 91, and the oil inlet of the pipeline system 12 passes through the cover and connects to the lubrication system.
[0027] A method for using a real-time positioning device for a dry ball mill sliding bearing, comprising the following steps:
[0028] Step 1: First, install the concave ball 14 on the ball seat 1 of the sliding track bearing, and at the same time, install the bearing pad 6 and the convex ball 13 through the center stud; install the limit nuts 3 on the threaded section of the limit stud 4 respectively, and then install the two limit studs 4 into the threaded holes 2 on the ball seat 1 through the threaded section respectively, with the lower end face of the limit nut 3 in contact with the upper surface of the ball seat 1.
[0029] Step 2: After aligning the position of the limiting stud 4 with the limiting hole 5 on the bearing 6, install the bearing 6 and the convex ball 13 installed in Step 1 onto the concave ball 14. The convex ball 13 and the concave ball 14 are in spherical contact. The smooth rod section of the limiting stud 4 is inserted into the limiting hole 5 of the bearing 6. Adjust the convex ball 13 and the concave ball 14 locally to ensure that the gap between the limiting stud 4 and the limiting hole 5 is uniform.
[0030] Step 3: After the positioning stud 4 is installed, the cylinder is slowly lowered onto the bearing 6. The positioning stud 4 restricts the freedom of the convex ball 13 and the concave ball 14, thereby ensuring the accuracy of the cylinder installation. After the cylinder is installed, the positioning stud 4 is screwed further down into the threaded hole 2 of the ball seat 1. When the annular groove of the positioning stud 4 coincides with the position of the positioning nut 3, the upper smooth section of the positioning stud 4 is completely disengaged from the positioning hole 5 of the bearing 6, maintaining the normal operating distance of the bearing. This releases the positioning restriction of the positioning stud 4, restores the self-aligning function of the bearing, and avoids local rigid friction during the operation of the cylinder.
[0031] Step 4: Using bolts 10, install the two flexible limiting blocks 8 on the outer sides of the bearing 6 and the cylinder slip ring 7 respectively through the mounting holes, leaving a gap of 0.15-0.2mm between the flexible limiting blocks 8 and the cylinder slip ring 7; connect the pipeline system 12 to the oil passage 91 inlet at the lower end of the flexible limiting block 8; during mill operation, continuously supply lubricating oil through the lubrication station to form a stable oil film between the outer edge end face of the cylinder slip ring 7 and the flexible limiting block 8.
[0032] The parts of this invention not described in detail are prior art.
[0033] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.
Claims
1. A method for using a real-time positioning device for a sliding bearing in a dry ball mill, characterized in that, The positioning device includes a limiting stud, a limiting nut, a flexible limiting block, and a piping system; The upper end of the limiting stud is a smooth section, and the lower end is a threaded section. An annular groove is provided at the junction of the smooth section and the threaded section. Two limiting studs are set on the upper surface of the ball seat of the sliding bearing through the threaded section. The two limiting studs are symmetrically arranged along the center of the ball seat. Limiting nuts are respectively set on the two limiting studs. The limiting nuts are in contact with the ball seat to further strengthen the limiting studs. Two limiting holes corresponding to the limiting studs are provided on the bottom surface of the bearing pad. The upper end of the limiting stud mates with the corresponding limiting holes. The flexible limiting block is an arc-shaped plate structure that matches the outer edge of the bearing. It has several mounting holes at the bottom and several guide grooves spaced vertically on its inner surface. The flexible limiting block is symmetrically positioned on both sides of the outer edge near the upper end face of the bearing, extending above it. Two oil grooves are located on the inner surface of the extended portion, corresponding to the outer edge of the cylinder slip ring on the bearing. Each of the two corresponding oil grooves within the flexible limiting block has an oil passage connecting to it. The oil passage inlet is located at the lower end of the flexible limiting block. The oil outlet of the pipeline system is connected to the oil passage inlet, and the oil inlet of the pipeline system passes through the cover and connects to the lubrication system. The specific steps for using the method are as follows: Step 1: First, install the concave ball on the ball seat of the sliding track bearing, and at the same time install the bearing pad and the convex ball through the center stud; install the limit nuts on the threaded section of the limit stud respectively, and then install the two limit studs in the threaded hole of the ball seat through the threaded section respectively, with the lower end face of the limit nut in contact with the upper surface of the ball seat. Step 2: After aligning the position of the limiting stud with the limiting hole on the bearing plate, install the bearing plate and convex ball installed in Step 1 onto the concave ball, with the convex ball and concave ball in contact. Insert the smooth section of the limiting stud into the limiting hole of the bearing plate. Make local adjustments to the convex ball and concave ball to ensure that the gap between the limiting stud and the limiting hole is uniform. Step 3: After the positioning stud is installed, slowly lower the cylinder onto the bearing pad. The positioning stud restricts the freedom of the convex and concave spheres, thus ensuring the accuracy of the cylinder installation. After installing the cylinder, screw the positioning stud further downward into the threaded hole of the ball seat. When the lower surface of the annular groove of the positioning stud coincides with the position of the positioning nut, the upper smooth section of the positioning stud is completely disengaged from the positioning hole of the bearing pad, maintaining the normal operating distance of the bearing pad. This releases the positioning restriction of the positioning stud, restores the self-aligning function of the bearing, and avoids local rigid friction during the operation of the cylinder. Step 4: Using bolts, install the two flexible limiting blocks on the outer sides of the bearing and the cylinder slip ring respectively through the mounting holes, leaving a gap of 0.15-0.2mm between the flexible limiting blocks and the cylinder slip ring; connect the pipeline system to the oil inlet at the lower end of the flexible limiting block; during mill operation, continuously supply lubricating oil through the lubrication station to form a stable oil film between the outer edge of the cylinder slip ring and the flexible limiting block.
2. The method of using the real-time positioning device for the sliding bearing of a dry ball mill according to claim 1, characterized in that: The threaded section of the limiting stud is longer than the smooth section, and its outer diameter is also larger than the smooth section. The threaded hole on the ball seat for installing the threaded section is 15-20mm deeper than the threaded section length.
3. The method of using the real-time positioning device for the sliding bearing of a dry ball mill according to claim 1, characterized in that: The flexible limiting block has a Babbitt alloy layer on its inner side and in the oil groove.