CN111715384A - Coal pulverizer with damping function - Google Patents
Coal pulverizer with damping function Download PDFInfo
- Publication number
- CN111715384A CN111715384A CN202010622032.0A CN202010622032A CN111715384A CN 111715384 A CN111715384 A CN 111715384A CN 202010622032 A CN202010622032 A CN 202010622032A CN 111715384 A CN111715384 A CN 111715384A
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- auxiliary
- coal mill
- side wall
- cavity
- coal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a coal mill with a vibration reduction function, which comprises a coal mill body positioned above the ground, wherein a separator and a coal dropping pipe are arranged on the coal mill body, a base is arranged on the lower side wall of the coal mill body, a hydraulic cavity is arranged below the ground, the hydraulic cavity is divided into a main cavity and two auxiliary cavities by a partition plate, the two auxiliary cavities and the main cavity are arranged side by side, the two auxiliary cavities are symmetrically arranged on two sides of the main cavity, each auxiliary cavity is communicated with the main cavity through a corresponding liquid supplementing port, the inner walls of the main cavity and the auxiliary cavities are respectively connected with a corresponding main piston plate and an auxiliary piston plate in a sealing sliding mode, corresponding first pressing rods and second pressing rods are respectively arranged on the upper side walls of the main piston plate and the auxiliary piston plate, and the top end of the first pressing rod penetrates through the upper side wall of the hydraulic cavity upwards and is fixedly connected with the lower side wall of the. The invention has the advantages that the arrangement of the multiple groups of auxiliary vibration damping mechanisms is matched with the hydraulic cavity for use, the vibration damping effect is obvious, and the abrasion of the coal mill is reduced.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a coal mill with a vibration reduction function.
Background
Coal mills are machines for crushing and grinding coal briquettes into coal dust, are important auxiliary equipment of pulverized coal boilers, and are widely applied to coal-fired power plants. However, in actual operation, a coal mill is generally easy to vibrate, so that the problems of reduced mill output, serious abrasion, shortened sealing life, broken joint, pulled crack of welding seam and the like are caused, the operation safety and stability of the coal mill are directly related to a thermal power generating unit, and even the safety of a large power grid is influenced.
The vibration reduction structure of the existing coal mill is relatively simple, the vibration reduction effect is not obvious only by reducing the vibration of the coal mill through the spring cushion block, and the problems of equipment abrasion and large maintenance workload cannot be solved efficiently.
Disclosure of Invention
The invention aims to overcome the defects of non-ideal vibration reduction effect and large equipment abrasion degree in the prior art, and provides a coal mill with a vibration reduction function.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coal mill with a vibration reduction function comprises a coal mill body located above the ground, wherein a separator and a coal dropping pipe are arranged on the coal mill body, a base is arranged on the side wall of the coal mill body, a hydraulic cavity is arranged below the ground, a main cavity and two auxiliary cavities are separated into the hydraulic cavity through a partition plate, the two auxiliary cavities and the main cavity are arranged side by side, the two auxiliary cavities are symmetrically arranged on two sides of the main cavity, each auxiliary cavity is communicated with the main cavity through a corresponding liquid supplementing port, the inner walls of the main cavity and the auxiliary cavities are respectively connected with a corresponding main piston plate and an auxiliary piston plate in a sealing and sliding mode, the upper side walls of the main piston plate and the auxiliary piston plate are respectively provided with a corresponding first pressure rod and a corresponding second pressure rod, the top end of the first pressure rod upwards penetrates through the upper side wall of the hydraulic cavity and is fixedly connected with the lower side wall of the base, a first spring is sleeved on the first pressure rod and is located between the lower side wall of, every the second depression bar top also upwards runs through the roof that lateral wall fixedly connected with corresponds on the hydraulic pressure chamber, and the cover is equipped with the second spring that corresponds on every second depression bar, the second spring is located under the roof between lateral wall and the ground, every on the roof under lateral wall and the base equal fixed third spring that sets up position symmetry between the lateral wall, the main cavity with all be provided with hydraulic oil in the auxiliary chamber, hydraulic oil is located master piston board and auxiliary piston board downside.
Preferably, the fluid infusion port is arranged at the lower end of the partition plate.
Preferably, the outer surfaces of the first pressure lever and the second pressure lever are smoothly polished, and the outer surfaces of the first pressure lever and the second pressure lever are plated with anti-corrosion plating layers.
Preferably, a plurality of groups of auxiliary vibration damping mechanisms are further arranged on the ground, and the plurality of groups of auxiliary vibration damping mechanisms are symmetrically arranged on two sides of the first pressure rod and the second pressure rod.
Preferably, every supplementary damping mechanism all sets up at subaerial horizontal pole including fixed, the horizontal pole both ends with all with ground fixed connection, sliding connection has two sliding sleeves on the horizontal pole, and still the cover is equipped with the fourth spring on the horizontal pole, the fourth spring both ends respectively with the sliding sleeve lateral wall fixed connection who corresponds, every all be provided with the first articulated seat that corresponds on the sliding sleeve, and the base downside wall is provided with the articulated seat of second that corresponds with first articulated seat, every all be connected through the hinge bar that corresponds between the articulated seat of first articulated seat and the articulated seat of second that corresponds.
Preferably, the cross rod is arranged in an inverted U shape and is made of stainless steel materials.
Preferably, be provided with the motor electrical apparatus install bin on the base, be provided with the motor electrical apparatus equipment who matches with the coal pulverizer body in the motor electrical apparatus install bin, and be provided with the heat conduction section of thick bamboo in the motor electrical apparatus install bin, sealed sliding connection has the stripper plate in the heat conduction section of thick bamboo, heat conduction section of thick bamboo upper end inner wall is provided with elastic switch, and is provided with appropriate amount of evaporating liquid under heat conduction section of thick bamboo downside inner wall and the stripper plate between the lateral wall, be provided with the heat dissipation fan with elastic switch electric connection in the motor electrical apparatus install bin, and be provided with the thermovent in the motor electrical apparatus.
Preferably, the peripheral side walls of the main piston plate and the auxiliary piston plate are wrapped with a layer of sealing rubber.
The invention has the beneficial effects that: in the device, the first spring, the second spring, the third spring and the fourth spring are vibration reduction damping springs, and the vibration reduction damping springs have the dual advantages of low frequency and large damping of steel springs.
Drawings
FIG. 1 is a schematic structural diagram of a coal pulverizer with vibration damping function according to the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an enlarged view at B of FIG. 1;
FIG. 4 is an enlarged view at C of FIG. 1;
FIG. 5 is a schematic front structural view of an auxiliary damping mechanism of a coal pulverizer with a damping function according to the present invention;
FIG. 6 is a schematic front structural diagram of a main chamber and an auxiliary chamber of a coal mill with vibration reduction function according to the present invention;
FIG. 7 is a schematic structural diagram of a position of a motor and electrical appliance installation box of the coal mill with a vibration damping function, which is provided by the invention;
fig. 8 is an enlarged view at D in fig. 7.
In the figure: 1 separator, 2 coal pulverizer bodies, 3 coal breakage pipes, 4 bases, 5 hydraulic pressure chambers, 6 main chambers, 7 auxiliary chambers, 8 clapboards, 9 main piston plates, 10 auxiliary piston plates, 11 first pressing rods, 12 second pressing rods, 13 first springs, 14 second springs, 15 top plates, 16 hinged rods, 17 liquid supplementing ports, 18 third springs, 19 cross rods, 20 sliding sleeves, 21 first hinged seats, 22 second hinged seats, 23 fourth springs, 24 motor electrical equipment installation boxes, 25 motor electrical equipment, 26 heat dissipation ports, 27 heat dissipation fans, 28 heat conduction cylinders and 29 elastic switches.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-8, a coal mill with vibration reduction function comprises a coal mill body 2 located above the ground, a separator 1 and a coal dropping pipe 3 are arranged on the coal mill body 2, a base 4 is arranged on the lower side wall of the coal mill body 2, a motor and electrical appliance installation box 24 is arranged on the base, a motor and electrical appliance 25 matched with the coal mill body 2 is arranged in the motor and electrical appliance installation box 24, a heat conduction cylinder 28 is arranged in the motor and electrical appliance installation box 24, a squeezing plate is connected in the heat conduction cylinder 28 in a sealing and sliding manner, an elastic switch 29 is arranged on the inner wall of the upper end of the heat conduction cylinder 28, a proper amount of evaporation liquid is arranged between the inner wall of the lower side of the heat conduction cylinder 28 and the lower side wall of the squeezing plate, the evaporation liquid is composed of liquid dichloromethane with a boiling point of 39.75 ℃, a heat dissipation fan 27 electrically connected with the elastic switch 29 is arranged in the motor and electrical, setting up the temperature in heat conduction section of thick bamboo and the elastic switch can the auto-induction electricity machine electrical apparatus install bin in the motor electrical apparatus install bin, when the box high temperature, the heat dissipation fan can be opened thereupon, cool down the processing of blowing to motor electrical apparatus, the subaerial hydraulic pressure chamber 5 that is provided with, separate into main cavity 6 and two auxiliary chambers 7 through baffle 8 in the hydraulic pressure chamber 5, two auxiliary chamber 7 cross sections all set the arc, it is great to coal pulverizer body 2 support area to set up auxiliary chamber 7 and main cavity 6 like this, avoid the appearance of the eccentric condition at the damping in-process, two auxiliary chambers 7 and main cavity 6 set up side by side, and two auxiliary chamber 7 symmetries set up in main cavity 6 both sides, all communicate through the fluid infusion mouth 17 that corresponds between every auxiliary chamber 7 and the main cavity 6, fluid infusion mouth 17 sets up at baffle 8 lower extreme, set up fluid infusion mouth 17 in baffle 8 downside is the hydraulic oil that sets up in hydraulic pressure chamber 5 in order to avoid main piston board 9 and auxiliary piston board 10 to push down and advance main piston board 9 and vice piston board 9 and the upper side of the auxiliary piston plate 10 influences the overall vibration damping effect of the device, the inner walls of the main cavity 6 and the auxiliary cavity 7 are respectively connected with the corresponding main piston plate 9 and the auxiliary piston plate 10 in a sealing sliding mode, the peripheral side walls of the main piston plate 9 and the auxiliary piston plate 10 are wrapped with a layer of sealing rubber, and the sealing rubber is arranged on the periphery of the main piston plate 9 and the auxiliary piston plate 10 to prevent hydraulic oil from seeping upwards through gaps between the main piston plate 9 and the main cavity 6 and between the auxiliary piston plate 10 and the auxiliary cavity 7 and being difficult to clean;
the upper side walls of the main piston plate 9 and the auxiliary piston plate 10 are respectively provided with a corresponding first pressure lever 11 and a corresponding second pressure lever 12, the outer surfaces of the first pressure lever 11 and the second pressure lever 12 are smoothly polished, and the outer surfaces of the first pressure lever 11 and the second pressure lever 12 are plated with anti-corrosion coatings, the first pressure lever 11 and the second pressure lever 12 open important connection functions, the first pressure lever 11 and the second pressure lever 12 are exposed outside for a long time and are easy to repair, the anti-corrosion coatings improve the anti-corrosion capability of the first pressure lever 11 and the second pressure lever 12, so that the service life of the first pressure lever 11 and the second pressure lever 12 is prolonged, the top end of the first pressure lever 11 upwards penetrates through the upper side wall of the hydraulic cavity 5 to be fixedly connected with the lower side wall of the base 4, and the first pressure lever 11 is sleeved with a first spring 13, in the device, the first spring 13, the second spring 14 and the third spring 18 are damping springs, the damping spring has the advantages of low frequency and large damping of the steel spring, eliminates the inherent resonance amplitude phenomenon of the steel spring, adopts the best quality spring steel, has the effect of the damper of more than 95 percent, has the service life of more than 10 years, has the advantages of low frequency and large damping of the steel spring damper, eliminates the inherent resonance amplitude phenomenon of the steel spring, is matched with the device for use, can effectively damp the coal mill body 2, thereby ensuring the safe and stable operation of the coal mill body 2, the first spring 13 is positioned between the lower side wall of the base 4 and the ground, the top end of each second pressure lever 12 also upwards penetrates through the upper side wall of the hydraulic cavity 5 and is fixedly connected with the corresponding top plate 15, each second pressure lever 12 is sleeved with the corresponding second spring 14, the second spring 14 is positioned between the lower side wall of the top plate 15 and the ground, and the third spring 18 with symmetrical positions is fixedly arranged between the upper side wall of each top plate 15 and the lower side wall of the base 4, hydraulic oil is arranged in the main cavity 6 and the auxiliary cavity 7 and is positioned on the lower sides of the main piston plate 9 and the auxiliary piston plate 10;
the ground is also provided with a plurality of groups of auxiliary damping mechanisms which are symmetrically arranged at two sides of the first pressure lever 11 and the second pressure lever 12, each auxiliary damping mechanism comprises a cross rod 19 fixedly arranged on the ground, the cross rod 19 is arranged in an inverted U shape, the cross rod 19 is made of stainless steel materials, the cross rod 19 is exposed in the air for a long time and is easy to corrode, the cross rod 19 made of stainless steel has good connecting and supporting effects and corrosion resistance, the service life of the cross rod 19 is prolonged, two ends of the cross rod 19 are fixedly connected with the ground, the cross rod 19 is slidably connected with two sliding sleeves 20, the cross rod 19 is also sleeved with a fourth spring 23, the fourth spring 23 is a damping spring, two ends of the fourth spring 23 are respectively fixedly connected with the corresponding side walls of the sliding sleeves 20, each sliding sleeve 20 is provided with a corresponding first hinged seat 21, the lower side wall of the base 4 is provided with a second hinged seat 22 corresponding to the first hinged seat 21, each first hinged seat 21 is connected with the corresponding second hinged seat 22 through a corresponding hinged rod 16, when the base 4 is driven to move downwards by the violent vibration of the coal mill body 2, the second hinged seat 22 arranged on the base 4 can extrude the hinged rods 16 to drive the two sliding sleeves 20 to mutually approach through the first hinged seats 21 and extrude a fourth spring 23, and in the process, the fourth spring 23 needs to be overcome to do work, so that the downward movement amplitude of the coal mill body 2 and the base 4 is weakened; on the contrary, when the coal mill body 2 drives the base 4 to move upwards, under the action of the first hinge seat 21, the hinge rod 16 and the second hinge seat 22, the coal mill body 2 drives the two sliding sleeves 20 to deflect in the process of moving upwards so as to stretch the fourth spring 23, and the action of the fourth spring 23 also needs to be overcome, so that the vibration reduction of the coal mill body 2 is realized.
In the invention, when the base 4 is driven to move downwards by the violent vibration of the coal mill body 2, the base 4 can downwards extrude the first spring 13 to do work through the first pressure lever 11, the first pressure lever 11 can extrude hydraulic oil in the main cavity 6 into the auxiliary cavity 7 through the main piston plate 9 in the downward moving process through the liquid supplementing port 17, the hydraulic oil in the auxiliary cavity 7 is increased, so that the auxiliary piston plate 10 is upwards pushed to move upwards, the auxiliary piston plate 10 can push the second pressure lever 12 to upwards push the top plate 15 in the upward moving process, and the top plate 15 upwards extrudes the base 4 through the third spring 18, so that the downward moving amplitude of the base 4 and the coal mill body 2 is weakened; when the coal pulverizer body 2 takes place violent vibration and drives base 4 and move up, the fixed first depression bar 11 that sets up lateral wall under base 4 drives main piston plate 9 and moves up, thereby with the hydraulic oil suction main cavity 6 in the vice chamber 7, hydraulic oil volume reduces in the vice chamber 7, with vice chamber 7 inner wall sealing sliding connection's vice piston plate 10 move down along with it, thereby drive second depression bar 12 and move down, the roof 15 of fixed setting on second depression bar 12 top drives third spring 18 and moves down thereupon, thereby there is decurrent pulling force to base 4, the weakening to the range of moving up of coal pulverizer body 2 and base 4 has been realized, the damping effect is better.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a coal pulverizer with damping function, is including coal pulverizer body (2) that is located the ground top, be provided with separator (1) and coal breakage pipe (3) on coal pulverizer body (2), and coal pulverizer body (2) downside wall is provided with base (4), a serial communication port, subaerial hydraulic pressure chamber (5) of being provided with, become main cavity (6) and two vice chambeies (7) through baffle (8) in hydraulic pressure chamber (5), two vice chambeies (7) and main cavity (6) set up side by side, and two vice chambeies (7) symmetry set up in main cavity (6) both sides, every all feed through corresponding fluid infusion mouth (17) intercommunication between vice chamber (7) and main cavity (6), main cavity (6) and vice chamber (7) inner wall sealing sliding connection have corresponding main piston board (9) and vice piston board (10) respectively, main piston board (9) and vice piston board (10) upside wall are provided with corresponding first pressure bar (11) and second pressure bar (11) respectively The top end of the first pressure lever (11) upwards penetrates through the upper side wall of the hydraulic cavity (5) and is fixedly connected with the lower side wall of the base (4), a first spring (13) is sleeved on the first pressure lever (11), the first spring (13) is positioned between the lower side wall of the base (4) and the ground, the top end of each second pressure lever (12) also upwards penetrates through the upper side wall of the hydraulic cavity (5) and is fixedly connected with a corresponding top plate (15), and each second pressure lever (12) is sleeved with a corresponding second spring (14), the second springs (14) are positioned between the lower side wall of the top plate (15) and the ground, third springs (18) with symmetrical positions are fixedly arranged between the upper side wall of each top plate (15) and the lower side wall of the base (4), the main cavity (6) with all be provided with hydraulic oil in vice chamber (7), hydraulic oil is located master piston board (9) and vice piston board (10) downside.
2. The coal mill with the vibration damping function according to claim 1, characterized in that the fluid infusion port (17) is provided at the lower end of the partition plate (8).
3. The coal mill with the vibration damping function according to claim 1, characterized in that the outer surfaces of the first compression bar (11) and the second compression bar (12) are subjected to smooth grinding treatment, and the outer surfaces of the first compression bar (11) and the second compression bar (12) are plated with anti-corrosion plating layers.
4. The coal mill with the vibration damping function according to claim 1, wherein a plurality of groups of auxiliary vibration damping mechanisms are further arranged on the ground, and the groups of auxiliary vibration damping mechanisms are symmetrically arranged on two sides of the first pressure rod (11) and the second pressure rod (12).
5. The coal mill with the vibration reduction function according to claim 4, wherein each auxiliary vibration reduction mechanism comprises a cross rod (19) fixedly arranged on the ground, the two ends of the cross rod (19) are fixedly connected with the ground, two sliding sleeves (20) are slidably connected onto the cross rod (19), a fourth spring (23) is further sleeved on the cross rod (19), the two ends of the fourth spring (23) are fixedly connected with the corresponding side walls of the sliding sleeves (20), each sliding sleeve (20) is provided with a corresponding first hinged seat (21), a second hinged seat (22) corresponding to the first hinged seat (21) is arranged on the lower side wall of the base (4), and each first hinged seat (21) is connected with the corresponding second hinged seat (22) through a corresponding hinged rod (16).
6. The coal mill with the vibration damping function according to claim 5, characterized in that the cross bar (19) is provided in an inverted U shape, and the cross bar (19) is made of stainless steel material.
7. The coal mill with the vibration damping function as claimed in claim 1, wherein a motor electrical installation box (24) is arranged on the base, motor electrical equipment (25) matched with the coal mill body (2) is arranged in the motor electrical installation box (24), a heat conduction barrel (28) is arranged in the motor electrical installation box (24), a squeezing plate is connected in the heat conduction barrel (28) in a sealing and sliding mode, an elastic switch (29) is arranged on the inner wall of the upper end of the heat conduction barrel (28), a proper amount of evaporation liquid is arranged between the inner wall of the lower side of the heat conduction barrel (28) and the lower side wall of the squeezing plate, a heat dissipation fan (27) electrically connected with the elastic switch (29) is arranged in the motor electrical installation box (24), and a heat dissipation opening (26) is arranged in the motor electrical installation box (24).
8. The coal mill with the vibration damping function as claimed in claim 1, wherein the peripheral side walls of the main piston plate (9) and the auxiliary piston plate (10) are wrapped with a layer of sealing rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010622032.0A CN111715384A (en) | 2020-07-01 | 2020-07-01 | Coal pulverizer with damping function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010622032.0A CN111715384A (en) | 2020-07-01 | 2020-07-01 | Coal pulverizer with damping function |
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| Publication Number | Publication Date |
|---|---|
| CN111715384A true CN111715384A (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010622032.0A Pending CN111715384A (en) | 2020-07-01 | 2020-07-01 | Coal pulverizer with damping function |
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| CN (1) | CN111715384A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393335A (en) * | 2020-10-05 | 2021-02-23 | 冯晗 | Compressor vibration damper for air conditioner outdoor unit |
| CN113007277A (en) * | 2021-04-10 | 2021-06-22 | 南京工程学院 | Rubber-plastic spring damping device for base and foundation of large coal mill and use method thereof |
-
2020
- 2020-07-01 CN CN202010622032.0A patent/CN111715384A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393335A (en) * | 2020-10-05 | 2021-02-23 | 冯晗 | Compressor vibration damper for air conditioner outdoor unit |
| CN113007277A (en) * | 2021-04-10 | 2021-06-22 | 南京工程学院 | Rubber-plastic spring damping device for base and foundation of large coal mill and use method thereof |
| CN113007277B (en) * | 2021-04-10 | 2023-11-03 | 南京工程学院 | Rubber plastic spring damping device for base and foundation of large coal mill and use method thereof |
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