A vertical mill speed reducer base structure
By setting grouting through holes and sleeve structures inside the vertical mill reducer base, the pre-embedding of the reducer base and the isolation of connecting bolts are realized, solving the problems of vibration, stability and water erosion of traditional reducer bases, improving the stability and maintenance convenience of the equipment, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 黎明重工股份有限公司
- Filing Date
- 2025-08-12
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional vertical mill reducer bases suffer from significant vibration, poor stability, susceptibility to water erosion, inconvenient maintenance, and high costs during operation.
The structure adopts a pre-embedded reducer base. By setting grouting through holes, sleeves and sealing plates in the base, the whole grouting pre-embedding is realized, which enhances the strength, isolates the connecting bolts from the concrete base, facilitates disassembly and maintenance, and increases the connection strength through the internal thread of the sleeve.
It improves the stability of vertical mill equipment, avoids water erosion, extends the life of components, reduces processing costs, and facilitates later maintenance.
Smart Images
Figure CN224352358U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of vertical mill technology, and in particular relates to a vertical mill reducer base structure. Background Technology
[0002] A vertical mill, also known as a vertical grinding mill, is as follows: For example, the Chinese utility model patent with authorization announcement number CN212549814U and patent name "A Vertical Grinding Mill" operates on the principle that an electric motor connects to a reducer via a coupling, thereby driving the grinding disc to rotate. Simultaneously, hot air enters the mill body from the bottom air inlet. Material falls from the feed inlet through the feed chute into the center of the grinding disc. Under the action of centrifugal force, the material moves evenly from the center of the grinding disc to the edge. When passing through the grinding roller track area on the grinding disc, it is crushed by the grinding rollers. Large pieces of material are directly crushed, while fine particles are compressed to form a material bed for intergranular pulverization. The crushed material continues to move towards the edge of the grinding disc until it is carried away by the strong airflow at the air ring, while larger particles fall back onto the grinding disc for further crushing. When the material in the airflow passes through the separator at the top, the rotor rotates at high speed, the rotor blades collide with the particles, and give the material a large circumferential speed, generating a large centrifugal force, which separates the large and small particles. Fine particles can exit the mill through the rotor and be collected by the dust collector, while large particles fall back into the grinding disc for further grinding.
[0003] See Figure 12 As shown, the reducer base is used below the reducer 2 of the vertical mill. During the operation of the vertical mill, it plays a supporting, positioning, connecting, and bearing dynamic and static loads, and is an important load-bearing component in the entire vertical mill equipment. The upper part of the reducer 2 is connected to the grinding disc 1, and the lower part of the reducer 2 is connected to the conventional reducer base 3 (in order to distinguish between the conventional reducer base and the reducer base of this application, in this specification, the conventional reducer base is referred to as the conventional reducer base and its attached drawing is marked 3, while the reducer base of this application is referred to as the pre-embedded reducer base and its attached drawing is marked 4). The side of the reducer 2 is connected to the motor (not shown in the figure) through a coupling. The motor drives the input shaft and output shaft of the reducer 2 to rotate, thereby driving the grinding disc 1 to rotate.
[0004] Due to the characteristics of the vertical mill's overall structure, the bottom surface of the traditional reducer base 3 is often lower than the zero reference surface 51 of the concrete base 5. Therefore, the traditional reducer base 3 needs to be placed in the lower foundation pit 52 of the concrete base 5, and the traditional reducer base 3 is fixed to the concrete base 5 by the anchor bolt assembly 6.
[0005] See Figure 11 As shown, the upper part of the conventional reducer base 3 and the lower part of the reducer 2 are fixedly connected by connecting bolts 7 and connecting nuts 71 (see...). Figure 11 (See schematic diagram of the cross-sectional structure of DD (I)). Alternatively, the connecting bolt 7 is inserted into the reducer 2 and threaded into the upper part of the conventional reducer base 3 to fix the two together (see...). Figure 11 (Diagram of cross-sectional structure of DD (II)); The lower part of the traditional reducer base 3 is fixed to the concrete base 5 by the anchor bolt assembly 6, and the anchor bolts 61 of several anchor bolt assemblies 6 are pre-embedded in the prepared concrete base 5.
[0006] In the existing traditional reducer base 3 installation structure, since the reducer 2 needs to be disassembled for inspection and maintenance later, the traditional reducer base 3 is often not pre-embedded (after pre-embedding the traditional reducer base 2, the connecting bolts 7 are also pre-embedded, making it impossible to disassemble the traditional reducer base 3 and the reducer 2). Instead, the anchor bolts 7 at the bottom of the traditional reducer base 3 are often pre-embedded to fix the traditional reducer base 3.
[0007] The following technical problems exist during the operation of the equipment in the traditional reducer base 3 structure: 1. The reducer 2, traditional reducer base 3 and other parts will vibrate significantly, resulting in poor overall stability of the equipment; 2. In addition, in order to minimize local vibration, the traditional reducer base 3 is often designed with added weight to improve relative stability, but this method increases material usage and processing costs, and the improvement effect is not very obvious; 3. The traditional reducer base 3 needs to be placed in a low-lying pit 52. For vertical mills operating outdoors, water is prone to accumulate in the low-lying pit 52, which can corrode the traditional reducer base 3 and the anchor bolt assembly 6, reducing their service life. Utility Model Content
[0008] To address the technical problems existing in the prior art, this application provides a vertical mill reducer base structure, which enables grouting and pre-embedding of the reducer base, enhances the overall strength of the reducer base, and effectively prevents water accumulation from corroding the reducer base and anchor bolts. This structure also allows for the disassembly and assembly of connecting bolts under the condition that the reducer base is pre-embedded with grout, facilitating the disassembly and maintenance of the reducer in the later stages.
[0009] To achieve the above objectives, this utility model provides the following technical solution:
[0010] A vertical mill reducer base structure includes a reducer base, which includes a lower plate, a vertical plate fixedly enclosing the upper part of the lower plate, and an upper plate fixedly connected to the upper part of the vertical plate. A grouting through hole communicating with the inner cavity of the reducer base is provided on the reducer base. Multiple threaded holes are provided on the upper plate. A sleeve is fixedly connected to the lower end face of the upper plate at the threaded holes, and a sealing plate is fixedly connected to the lower end face of the sleeve. The upper and lower end faces of the sleeve are respectively sealed by the upper plate and the sealing plate. Connecting bolts pass through the reducer connecting plate and are threaded into the threaded holes of the upper plate. An anchor bolt assembly fixes the lower plate to a concrete base.
[0011] Preferably, the sleeve has an internal thread on its inner circumference, the inner cavity of the sleeve is coaxial with the threaded hole of the upper plate, and the connecting bolt passes through the reducer connecting plate and is sequentially threaded to the threaded hole of the upper plate and the sleeve.
[0012] Preferably, the grouting through holes are formed on the vertical plate and there are multiple holes.
[0013] Preferably, both the upper plate and the lower plate have through holes in the middle that connect to the inner cavity of the reducer base.
[0014] Preferably, an upper washer is provided at the upper end of the reducer connecting plate, and the connecting bolts are sequentially passed through the upper washer and the reducer connecting plate and threaded into the threaded hole of the upper plate.
[0015] Preferably, the anchor bolt assembly includes an anchor bolt vertically fixedly connected within the concrete base and passing through the lower plate, a lower washer sleeved on the anchor bolt above the lower plate, and an anchor nut threadedly connected to the anchor bolt above the lower washer.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. This utility model, by setting grouting through holes, sleeves, and sealing plates, allows the pre-embedded reducer base to be embedded in a concrete base (the upper surface of the concrete base can be flush with the upper surface of the upper plate). Compared with existing traditional reducer bases, this enhances the overall strength and improves the stability of the vertical mill during operation. The sleeves and sealing plates isolate the connecting bolts from the concrete base, facilitating bolt disassembly and assembly even with the pre-embedded reducer base being grouted, thus simplifying later reducer disassembly and maintenance. Since the pre-embedded reducer base can be completely embedded, the low-lying foundation pit of the traditional concrete base can be filled, effectively avoiding water accumulation in outdoor foundation pits as in existing technologies. This prevents water from corroding the pre-embedded reducer base and anchor bolt assembly, extending the service life of the components.
[0018] 2. This pre-embedded reducer base, by opening grouting through holes, upper plate through holes and lower plate through holes, can reduce weight under the same design requirements compared to traditional reducer bases, which can save costs and improve strength.
[0019] 3. By setting an internal thread on the sleeve, this utility model can increase the threaded connection length of the connecting bolts without increasing the thickness of the upper plate, thereby improving the connection strength and stability between the reducer and the upper plate. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0021] Figure 2 for Figure 1 A frontal view of the structure.
[0022] Figure 3 for Figure 2 A schematic diagram of the AA cross section (Example 1 of this application).
[0023] Figure 4 for Figure 2 A schematic diagram of the AA cross section (Example 2 of this application).
[0024] Figure 5 This is a schematic diagram of the pre-embedded reducer base of this utility model.
[0025] Figure 6 for Figure 5 A schematic diagram of the BB cross section (Example 1 of this application).
[0026] Figure 7 for Figure 5 A schematic diagram of the BB cross section (Example 2 of this application).
[0027] Figure 8 for Figure 5 A schematic diagram of the CC cross-section.
[0028] Figure 9 for Figure 5 A top-view structural diagram.
[0029] Figure 10 This is a schematic diagram of the structure of this utility model installed on a concrete base and a speed reducer.
[0030] Figure 11 This is a structural schematic diagram of a traditional reducer base and two DD cross-sections.
[0031] Figure 12 This is a schematic diagram of the structure of a traditional speed reducer base installed on a concrete foundation and the speed reducer.
[0032] In the picture: 1. Grinding stone,
[0033] 2. Gearbox, 21. Gearbox connecting plate, 211. Connecting plate through hole.
[0034] 3. Traditional reducer base,
[0035] 4. Pre-embedded reducer base; 41. Lower plate; 411. Lower plate through hole; 412. Lower plate connection through hole; 42. Vertical plate; 421. Grouting through hole; 43. Upper plate; 431. Upper plate through hole; 432. Upper plate threaded hole; 44. Base inner cavity; 45. Rib plate.
[0036] 5. Concrete base platform; 51. Foundation zero reference surface; 52. Low-lying foundation pit.
[0037] 6. Anchor bolt assembly; 61. Anchor bolt; 62. Lower washer; 63. Anchor nut.
[0038] 7. Connecting bolts, 71. Connecting nuts, 72. Upper washers,
[0039] 8. Sleeve; 81. Sealing plate; 82. Sleeve inner cavity; 83. Round steel; 831. Round steel connecting hole. Detailed Implementation
[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0041] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1
[0042] See appendix Figure 1 , 2 As shown, a vertical mill reducer base structure includes a pre-embedded reducer base 4. The pre-embedded reducer base 4 includes a horizontally arranged lower plate 41, a vertically enclosed plate 42 welded to the upper end of the lower plate 41, and an upper plate 43 horizontally welded to the upper end of the vertical plate 42. The lower plate 41, vertical plate 42, and upper plate 43 enclose a base cavity 44. The outer end faces of the lower plate 41 and upper plate 43 extend to the outer side of the outer end face of the vertical plate 42, improving the connection strength with the concrete base 5 after pre-embedding. It should be noted that a conventional reducer base 3 can also have the above structure. The main difference between the pre-embedded reducer base 4 of this application and the conventional reducer base 3 lies in the following aspects.
[0043] See appendix Figure 5As shown, to facilitate the grouting and pre-embedding of the pre-embedded reducer base 4, in this embodiment, a grouting through hole 421 communicating with the inner cavity 44 of the base is provided on the upright plate 42. If four enclosing upright plates 42 are provided, a grouting through hole 421 is provided on each upright plate 42. Concrete grout can enter the inner cavity 44 of the base through the grouting through hole 421 to pre-embed the pre-embedded reducer base 4 into the concrete base 5. In addition, the provision of the grouting through hole 421 achieves a certain degree of weight reduction design and reduces equipment costs.
[0044] To improve the connection strength between the upper plate 43, the vertical plate 42 and the lower plate 41, a stiffening plate 45 is welded to the outer end face of the vertical plate 42, and the upper and lower end faces of the stiffening plate 45 are welded to the upper plate 43 and the lower plate 41 respectively.
[0045] See Figure 8 , 9 As shown, a circular upper plate through hole 431 is provided in the middle of the upper end face of the upper plate 43, and a square lower plate through hole 411 is provided in the middle of the lower plate 41. By setting the upper plate through hole 431 and the lower plate through hole 411, the weight reduction design of the pre-embedded reducer base 4 can be realized.
[0046] Anchor bolt assembly 6 securely connects the lower plate 41 to the concrete base 5. Anchor bolt assembly 6 includes vertically upward-fixed anchor bolts 61 embedded in the concrete base 5, lower washers 62 fitted onto the anchor bolts 61 above the lower plate 41, and anchor nuts 63 threadedly connected to the anchor bolts 61 above the lower washers 62. Specifically, multiple lower plate connecting through holes 412 corresponding to the anchor bolts 61 are evenly distributed on the lower plate 41. The anchor bolts 61 pass through these lower plate connecting through holes 412, and the outer diameter of the lower washers 62 is larger than the inner diameter of the lower plate connecting through holes 412. The lower plate 41 is secured to the concrete base 5 by tightening the anchor nuts 63.
[0047] See Figure 3 , 6 As shown in Figure 9, in order to fix the upper plate 43 to the reducer 2, multiple upper plate threaded holes 432 are evenly distributed on the upper plate 43. A sleeve 8 is welded to the lower end face of the upper plate 43 at each upper plate threaded hole 432, and a sealing plate 81 is welded to the lower end face of the sleeve 8. The upper and lower end faces of the sleeve 8 are sealed by the upper plate 43 and the sealing plate 81, respectively. That is, the inner cavity 82 of the sleeve formed by the sleeve 8 and the sealing plate 81 is only connected to the outside through the upper plate threaded hole 432, so that concrete slurry cannot enter the inner cavity 82 of the sleeve. A connecting plate through hole 211 is opened on the reducer connecting plate 21 of the existing reducer 2, corresponding to the upper plate threaded hole 432. The connecting bolt 7 passes through the connecting plate through hole 211 and is threaded into the upper plate threaded hole 432.
[0048] Furthermore, an upper washer 72 is provided on the upper end of the reducer connecting plate 21, and the connecting bolt 7 is sequentially inserted into the upper washer 72 and the connecting plate through hole 211 and threaded into the upper plate thread hole 432.
[0049] Preferably, in order to facilitate the insertion of the connecting bolt 7 into the sleeve 8, the inner diameter of the sleeve 8 is appropriately larger than the screw diameter of the connecting bolt 7, and the length of the sleeve 8 is appropriately longer than the length of the connecting bolt 7 after it is installed (that is, after the reducer connecting plate 21 and the upper plate 43 are fixed by the connecting bolt 7, there is still a gap between the lower end face of the connecting bolt 7 and the upper end face of the sealing plate 81).
[0050] With the above structure, the grout will not enter the inner cavity 82 of the sleeve after the pre-embedded reducer base 4 is grouted, so it will not affect the connecting bolt 7. The connecting bolt 7 can be easily removed when the reducer 2 is disassembled for later maintenance. Example 2
[0051] This embodiment further improves the sleeve 8 and sealing plate 81 based on embodiment 1 to enhance the connection strength between the reducer connecting plate 21 and the upper plate 43. In certain special cases, when it is necessary to increase the threaded connection length between the connecting bolt 7 and the threaded hole 432 of the upper plate to ensure the connection strength between the reducer 2 and the upper plate 43, and when it is considered that the thickness of the upper plate 43 cannot be arbitrarily increased, the technical solution of this embodiment can be preferred.
[0052] See Figure 4 , 7 As shown, the difference between this embodiment and Embodiment 1 is that:
[0053] The sleeve 8 is formed by opening a round steel connecting hole 831 along the axial direction of an existing round steel 83. The round steel connecting hole 831 does not penetrate the lower end face of the round steel 83. That is, in this embodiment, the part of the round steel 83 below the round steel connecting hole 831 can be regarded as the sealing plate 81 in embodiment 1. The sleeve internal thread is formed in the round steel connecting hole 831 by tapping, which matches the thread of the upper plate threaded hole 432 and the connecting bolt 7.
[0054] In this embodiment, the sleeve 8 is fixed to the upper plate 43 in a similar manner to that in embodiment 1. In this embodiment, a bevel is required on the upper end face of the round steel 83, through which it is welded to the lower end face of the upper plate 43. The size of the bevel must be designed to match the size of the round steel connecting hole 831 to avoid interference caused by an excessively large bevel. In this embodiment, the inner cavity 82 of the sleeve is the inner cavity of the round steel connecting hole 831, which can only connect to the outside through the threaded hole 432 on the upper plate. The inner cavity 82 of the sleeve and the threaded hole 432 on the upper plate are coaxially arranged so that the connecting bolt 7 can pass through the reducer connecting plate 21 and be sequentially threaded into the threaded hole 432 on the upper plate and the round steel connecting hole 831.
[0055] It should be noted that in order for the connecting bolt 7 to be threaded into the upper plate threaded hole 42 and the round steel connecting hole 831 in sequence, the round steel 83 needs to be vertically welded to the lower end face of the upper plate 43 first, and then the upper plate 43 and the round steel 83 need to be drilled and tapped to ensure that the threaded holes on the upper plate 43 and the round steel 83 are the same threaded holes, thereby ensuring the normal connection of the connecting bolt 7.
[0056] The installation process for Examples 1 and 2 is as follows:
[0057] like Figure 10 As shown, 1. Pour concrete foundation 5 to form a low-level foundation pit 52, and vertically embed anchor bolts 61 into the low-level foundation pit 52 of the concrete foundation 5. Hoist the pre-embedded reducer base 4 so that each lower plate through hole 411 on the lower plate 41 is fitted onto the corresponding anchor bolt 61. Place lower washers 62 on the anchor bolts 61 above the lower plate 41 and tighten them with anchor nuts 63 to fix the lower plate 41 in the low-level foundation pit 52.
[0058] 2.1 The installation process of the upper plate 43 and the reducer 2 in Example 1 is as follows:
[0059] The reducer 2 is hoisted and each of the connecting plate through holes 211 on the reducer connecting plate 21 corresponds one-to-one with the threaded holes 432 on the upper plate. An upper washer 72 is placed above the connecting plate through holes 211. The connecting bolt 7 passes through the upper washer 72 and the connecting plate through holes 211 and is threaded into the threaded holes 432 on the upper plate. At this time, the lower end of the connecting bolt 7 passes through the inner cavity 82 of the sleeve.
[0060] 2.2 The installation process of the upper plate 43 and the reducer 2 in Example 2 is as follows:
[0061] The reducer 2 is hoisted and each connecting plate through hole 211 on the reducer connecting plate 21 corresponds one-to-one with the round steel 83. After drilling holes in the upper plate 43 and extending them into the round steel 83, each hole is tapped to form a threaded hole 432 on the upper plate and a connecting hole 831 on the round steel. Each set of threaded holes 432 on the upper plate and connecting holes 831 on the round steel corresponds one-to-one with each connecting plate through hole 211. An upper washer 72 is placed above the connecting plate through hole 211. The connecting bolt 7 passes through the upper washer 72 and the connecting plate through hole 211 and is threaded into the threaded hole 432 on the upper plate and the connecting hole 831 on the round steel in sequence.
[0062] 3. Grouting is performed on the low-lying foundation pit 52. The grout enters the inner cavity 44 of the base through the grouting through hole 421, and fills the low-lying foundation pit 52 until the foundation zero reference surface 51 is flush with the upper end surface of the upper plate 43.
[0063] 4. Then install the other components of the vertical mill according to the existing technology; when it is necessary to repair the reducer 2, simply remove the connecting bolts 7.
[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A vertical mill reducer base structure, comprising a reducer base, the reducer base including a lower plate, a vertical plate fixedly enclosing the upper end of the lower plate, and an upper plate fixedly connected to the upper end of the vertical plate, characterized in that: A grouting through hole communicating with the inner cavity is provided on the base of the reducer; The upper plate has multiple threaded holes, and a sleeve is fixedly connected to the lower end face of the upper plate at the threaded holes. A sealing plate is fixedly connected to the lower end face of the sleeve, and the upper and lower end faces of the sleeve are sealed by the upper plate and the sealing plate, respectively. The connecting bolts pass through the reducer connecting plate and are threaded into the threaded holes in the upper plate; The anchor bolt assembly secures the lower plate to the concrete base.
2. The vertical mill reducer base structure according to claim 1, characterized in that: The sleeve has an internal thread on its inner circumference. The inner cavity of the sleeve is coaxial with the threaded hole of the upper plate. The connecting bolt passes through the reducer connecting plate and is sequentially threaded to the threaded hole of the upper plate and the sleeve.
3. The vertical mill reducer base structure according to claim 1 or 2, characterized in that: The grouting through holes are opened on the vertical plate and there are multiple of them.
4. The vertical mill reducer base structure according to claim 1 or 2, characterized in that: Both the upper plate and the lower plate have through holes in the middle that connect to the inner cavity of the reducer base.
5. The vertical mill reducer base structure according to claim 1 or 2, characterized in that: An upper washer is provided on the upper end of the reducer connecting plate, and the connecting bolts are sequentially passed through the upper washer and the reducer connecting plate and threaded into the threaded hole of the upper plate.
6. The vertical mill reducer base structure according to claim 1 or 2, characterized in that: The anchor bolt assembly includes an anchor bolt vertically fixed within the concrete base and passing through the lower plate, a lower washer fitted onto the anchor bolt above the lower plate, and an anchor nut threaded onto the anchor bolt above the lower washer.