Medium-speed coal mill damper
By designing a damper structure in the coal mill that combines frame body, tie rod bolts, joint bearings, spring base, external and internal springs and hydraulic loading devices, the problem of the gap between the grinding roller and grinding bowl lining plate in the coal mill is solved, and automatic gap compensation and spring buffering are achieved, which extends the equipment life and increases the adjustment range of output.
Patent Information
- Application Number
- CN202421851175.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-08-01
AI Technical Summary
The existing coal mill dampers are hard-connected with bolts. The grinding roller can only reach the preset position and cannot continue to be loaded forward. After the grinding roller and the grinding bowl liner are worn, the gap becomes larger, and the machine needs to be stopped to adjust the limit bolts. There is no buffering when the coal mill vibrates, which can easily damage the coal mill.
A medium-speed coal mill damper is designed, which adopts a combined structure of frame body, tie rod bolts, joint bearings, spring base, external and internal springs and hydraulic loading devices. The spring base is fixed by nuts. The external and internal springs are compressed during initial installation, offsetting the gravity of the grinding rollers, and the hydraulic loading device maintains the gap size.
Automatic compensation of the gap between the grinding roller and the grinding bowl lining plate is realized, avoiding the problem of increasing gap caused by wear, providing spring buffering, slowing down the vibration of the coal mill, extending the equipment life, and reducing the minimum output force, increasing the adjustment range of output force.
Smart Images
Figure CN222924844U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal mill dampers, specifically to a medium-speed coal mill damper. Background Technique
[0002] A coal mill damper is a device installed in the coal mill structure system to consume the energy of the system. Its main function is to suppress the movement of the system by increasing the damping force of the system, thereby reducing the vibration response of the system, and protecting the coal mill and its related components from damage caused by vibration and impact.
[0003] The existing device uses hard bolt connection, and the grinding roller can only reach the pre-set position and cannot continue to lean forward for loading. After the grinding roller and the grinding bowl liner are worn, the gap becomes larger, and it is necessary to stop the machine to adjust the limit bolt to reach the preset gap. There is no buffer when the coal mill vibrates, and it is easy to damage the coal mill.
[0004] Therefore, we propose a medium-speed coal mill damper to solve the problems mentioned above. Content of the Utility Model
[0005] The purpose of the utility model is to provide a medium-speed coal mill damper to solve the problems in the above background technique that the existing device uses hard bolt connection, the grinding roller can only reach the pre-set position and cannot continue to lean forward for loading. After the grinding roller and the grinding bowl liner are worn, the gap becomes larger, and it is necessary to stop the machine to adjust the limit bolt to reach the preset gap. There is no buffer when the coal mill vibrates, and it is easy to damage the coal mill.
[0006] To achieve the above purpose, the utility model provides the following technical solution: a medium-speed coal mill damper, including a frame:
[0007] A pull rod bolt is connected to the right end of the frame, and a spherical plain bearing is installed at the right end of the pull rod bolt. A spring base is arranged at the right end of the spherical plain bearing, and a plurality of screw rods are installed on the spring base. The right end of the screw rod penetrates through a spring gland, and an outer spring and an inner spring are installed between the spring base and the spring gland. A stop block is arranged at the right end of the spring gland, and the stop block is embedded in the pull rod bolt.
[0008] Preferably, the pull rod bolt is fixedly connected to the frame, and the pull rod bolt penetrates through the spherical plain bearing. The pull rod bolt penetrates through the spring base, and the screw rod is embedded inside the spring base. A nut is sleeved outside the screw rod, and the screw rod is threadedly connected with the nut, and the nut is attached to the right end of the spring base.
[0009] By adopting the above technical solution, the spring base is fixed on the pull rod bolt through the nut.
[0010] Preferably, the middle end of the screw rod penetrates through the outer spring and the inner spring, and the right ends of the outer spring and the inner spring are fixedly connected to the spring gland. Moreover, the outer spring and the inner spring are in a compressed state. A nut is arranged at the right end of the spring gland, and the right end of the spring gland is in contact with the stop block. A washer is arranged inside the stop block, and a screw is connected between the spring gland and the stop block.
[0011] With the above technical solution, when the outer spring and the inner spring are in a compressed state during initial installation, the elastic force generated by the compression can offset the gravity of the grinding roller. The screw is fastened to the spring gland, and its function is to prevent the spring gland from falling off the tie rod bolt.
[0012] Preferably, a grinding roller head is installed in the middle of the right end of the frame body, and a grinding roller body is fixedly connected to the lower end of the grinding roller head.
[0013] With the above technical solution, the grinding roller head plays a supporting role for the grinding roller body.
[0014] Preferably, the spherical plain bearing includes a spherical socket and a spherical surface, and the spherical socket is movably connected to the spherical surface.
[0015] With the above technical solution, the spherical surface can swing at a certain angle within the spherical socket.
[0016] Preferably, three groups of grinding roller bodies are arranged at equal intervals, and trunnions are installed on the grinding roller bodies.
[0017] With the above technical solution, grinding is carried out by the rolling of the grinding rollers. The three grinding roller bodies on the grinding bowl are evenly distributed on the circumference at an interval of 120°. The grinding roller bodies can roll along the grinding bowl and rotate around their respective trunnions.
[0018] Preferably, a hydraulic loading device is installed in the middle of the left end of the frame body, and a grinding bowl body is installed at the lower end of the frame body. A grinding bowl liner is installed at the upper end of the grinding bowl body, and a gap is provided between the grinding roller body and the grinding bowl liner.
[0019] With the above technical solution, the hydraulic loading output is increased through the hydraulic loading device. The increase in the loading output enables the grinding roller to rotate clockwise around the trunnion and maintains the size of the gap.
[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: This medium-speed coal mill damper;
[0021] 1. Through the cooperation among the grinding roller, the grinding bowl liner, the frame body, the outer spring, the inner spring, and the hydraulic loading device, the gap generated due to the wear and thinning of the grinding roller and the grinding bowl liner is compensated online, so that the gap between the grinding roller and the grinding bowl liner is maintained at a certain level without the need for shutdown debugging;
[0022] 2. Through the elastic buffering of the inner and outer springs, the springs will unload the inertial force of the swing of the roller head, enabling the roller to make a soft landing, preventing damage to the equipment, reducing the vibration of the coal mill, and extending the service life of the equipment.
[0023] 3. Through the elastic force of the inner and outer springs, the gravity exerted by the roller on the bowl liner can be completely offset. Theoretically, the minimum output of the coal mill is 0, which provides convenience for the peak shaving operation of the thermal power generating unit, reduces the minimum output of the coal mill, and increases the adjustment range of the output. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a front view sectional structure schematic diagram of the present utility model;
[0025] Figure 2 It is a partial sectional structure schematic diagram of the present utility model;
[0026] Figure 3 It is the present utility model Figure 1 The enlarged structure schematic diagram at position A in it;
[0027] Figure 4 It is a ball socket structure schematic diagram of the present utility model;
[0028] Figure 5 It is a front view structure schematic diagram of the present utility model.
[0029] In the figure: 1. Tie rod bolt; 2. Spherical plain bearing; 3. Spring base; 4. Nut; 5. Screw rod; 6. Outer spring; 7. Inner spring; 8. Spring gland; 9. Washer; 10. Screw; 11. Stop block; 12. Frame body; 13. Roller head; 14. Ball socket; 15. Spherical surface; 16. Roller body; 17. Bowl liner; 18. Gap; 19. Hydraulic loading device; 20. Trunnion; 21. Bowl body. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0031] Please refer to Figures 1-5, the present utility model provides a technical solution: a damper for a medium-speed coal mill, including a frame body 12. A pull rod bolt 1 is connected to the right end of the frame body 12, and a spherical plain bearing 2 is installed at the right end of the pull rod bolt 1. A spring base 3 is arranged at the right end of the spherical plain bearing 2, and a plurality of screw rods 5 are installed on the spring base 3. The right end of the screw rod 5 penetrates through a spring gland 8, and an outer spring 6 and an inner spring 7 are installed between the spring base 3 and the spring gland 8. A stop block 11 is arranged at the right end of the spring gland 8, and the stop block 11 is embedded in the pull rod bolt 1. The pull rod bolt 1 is fixedly connected to the frame body 12, and the pull rod bolt 1 penetrates through the spherical plain bearing 2. The pull rod bolt 1 penetrates through the spring base 3, and the screw rod 5 is embedded inside the spring base 3. A nut 4 is sleeved outside the screw rod 5, and the screw rod 5 is threadedly connected to the nut 4, and the nut 4 is in contact with the right end of the spring base 3. The middle part of the screw rod 5 penetrates through the outer spring 6 and the inner spring 7, and the right ends of the outer spring 6 and the inner spring 7 are in contact and connected to the spring gland 8, and the outer spring 6 and the inner spring 7 are in a compressed state. A nut 4 is arranged at the right end of the spring gland 8, and the right end of the spring gland 8 is in contact with the stop block 11. A washer 9 is arranged inside the stop block 11, and a screw 10 is connected between the spring gland 8 and the stop block 11. The pull rod bolt 1 is installed on the frame body 12, and parts such as the spherical plain bearing 2, the spring base 3, the outer spring 6, the inner spring 7, and the spring gland 8 are all successively worn on the pull rod bolt 1. The left side of the spherical plain bearing 2 is tightly attached to the roller head 13, and the right side is tightly attached to the spring base 3. The spherical plain bearing 2 is a complete set of structure, divided into two parts: a spherical socket 14 and a spherical surface 15. The spherical surface 15 can swing at a certain angle inside the spherical socket 14. An outer spring 6 and an inner spring 7 are arranged between the spring base 3 and the spring gland 8. The inner spring 7 is placed inside the outer spring 6. The outer spring 6 and the inner spring 7 have opposite helix directions, which are left-handed and right-handed respectively. The outer spring 6 and the inner spring 7 are in a compressed state. The spring base 3 and the spring gland 8 are connected by a plurality of screw rods 5 and tightened with a plurality of nuts 4. The stop block 11 is in the shape of a cuboid, which is inserted into the rectangular notch of the pull rod bolt 1 and fastened to the spring gland 8 with a screw 10. Its function is to prevent the spring gland 8 from falling off the pull rod bolt 1.
[0032] In the middle of the right end of the frame body 12, a roller head 13 is installed, and a roller body 16 is fixedly connected to the lower end of the roller head 13. The spherical plain bearing 2 includes a spherical socket 14 and a spherical surface 15, and the spherical socket 14 is movably connected to the spherical surface 15. Three groups of roller bodies 16 are arranged at equal distances, and a trunnion 20 is installed on the roller body 16. In the middle of the left end of the frame body 12, a hydraulic loading device 19 is installed, and a grinding bowl body 21 is installed at the lower end of the frame body 12. A grinding bowl liner 17 is installed at the upper end of the grinding bowl body 21, and a gap 18 is arranged between the roller body 16 and the grinding bowl liner 17. The coal is ground by the rotation of the roller body 16 around the trunnion 20 in cooperation with the grinding bowl body 21. The grinding bowl body 21 rotates, driving the roller body 16 to rotate, and also grinding the coal blocks. The three groups of roller bodies 16 increase the grinding efficiency and improve the grinding rate.
[0033] Working principle: When using the damper of this medium-speed coal mill, the grinding bowl body 21 is driven to rotate by a speed reduction device and a vertically distributed main shaft. The raw coal falls from the central coal dropping pipe of the coal mill onto the rotating grinding bowl body 21. Under the action of centrifugal force, the raw coal moves radially outward to form a coal bed, and is ground by rolling with the grinding roller body 16. The three grinding roller bodies 16 on the grinding bowl body 21 are evenly distributed on the circumference at intervals of 120°. They can roll along the grinding bowl body 21 and rotate around their respective trunnions 20. During operation, an independent hydraulic loading device 19 applies pressure to the grinding roller head 13 to make the grinding roller body 16 have a vertical pressure on the grinding bowl body 21. The rotating grinding bowl body 21 drives the grinding roller body 16 to rotate and grind the raw coal. By increasing the hydraulic loading output of the hydraulic loading device 19, the increased loading output enables the grinding roller body 16 to rotate clockwise around the trunnion 20 to maintain the size of the gap 18. An outer spring 6 and an inner spring 7 are arranged between the spring base 3 and the spring gland 8. The inner spring 7 is placed inside the outer spring 6. The outer spring 6 and the inner spring 7 have opposite helix directions, namely left-handed and right-handed respectively. The outer spring 6 and the inner spring 7 are in a compressed state. The inner spring 6 and the outer spring 7 will unload the inertial force of the swing of the grinding roller head 13, enabling the grinding roller body 16 to land softly without damaging the equipment.
[0034] Thus, a series of operations are completed. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.
[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A medium speed coal mill damper, comprising a frame (12), characterized in that: The right end of the frame body (12) is connected to a tie rod bolt (1), and a joint bearing (2) is installed on the right end of the tie rod bolt (1). A spring base (3) is provided at the right end of the joint bearing (2), and a plurality of sets of screw rods (5) are installed on the spring base (3). A spring pressure cover (8) passes through the right end of the screw rod (5), and an outer spring (6) and an inner spring (7) are installed between the spring base (3) and the spring pressure cover (8). A stopper (11) is provided at the right end of the spring pressure cover (8), and the stopper (11) is embedded in the tie rod bolt (1).
2. The medium speed coal mill damper according to claim 1, characterized in that: The pull rod bolt (1) is fixedly connected to the frame (12), and the pull rod bolt (1) passes through the joint bearing (2), the pull rod bolt (1) passes through the spring base (3), and the screw rod (5) is embedded in the spring base (3), the screw rod (5) is provided with a nut (4) on the outer sleeve, and the screw rod (5) is threadedly connected to the nut (4), and the nut (4) is fitted with the right end of the spring base (3).
3. The medium speed coal mill damper according to claim 1, characterized in that: The middle end of the screw rod (5) passes through the outer spring (6) and the inner spring (7), and the right ends of the outer spring (6) and the inner spring (7) are closely connected with the spring pressure cover (8), and the outer spring (6) and the inner spring (7) are in a compressed state. The right end of the spring pressure cover (8) is provided with a nut (4), and the right end of the spring pressure cover (8) is closely connected with the stopper (11), a washer (9) is provided in the stopper (11), and a screw (10) is connected between the spring pressure cover (8) and the stopper (11).
4. The medium speed coal mill damper according to claim 1, characterized in that: A grinding roller head (13) is installed in the middle of the right end of the frame (12), and a grinding roller body (16) is fixedly connected to the lower end of the grinding roller head (13).
5. The medium speed coal mill damper according to claim 1, characterized in that: The joint bearing (2) comprises a ball socket (14) and a spherical surface (15), and the ball socket (14) and the spherical surface (15) are movably connected.
6. The medium speed coal mill damper according to claim 4, characterized in that: The grinding roller bodies (16) are arranged in three groups at equal intervals, and a trunnion (20) is installed on the grinding roller bodies (16).
7. The medium speed coal mill damper according to claim 1, characterized in that: A hydraulic loading device (19) is installed in the middle of the left end of the frame (12), and a grinding bowl body (21) is installed at the lower end of the frame (12), a grinding bowl liner (17) is installed at the upper end of the grinding bowl body (21), and a gap (18) is provided between the grinding roller body (16) and the grinding bowl liner (17).