JP2017196545A - Vertical type roller mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install smoothly in a restricted installation space, a stopper for setting a stop position at a descending time of a roller, in a vertical type roller mill provided with an arm on a trestle made of concrete connected integrally with base concrete.SOLUTION: A stopper 9 for setting a stop position at a descending time of a roller includes a stopper body 1 having on the tip, an abutting part 7 abutting on a reception part 8 formed on an arm 15, and positioning means 2, 5, 11, 12 for adjusting the stop position at the descending time of the roller by adjusting the position of the stopper body 1. The abutting part 7 has a convex spherical shape, and the reception part 8 has a concave spherical surface.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vertical roller mill for pulverizing coal, cement raw materials and the like by a compression table and a roller using a rotary table and a roller.

  Conventionally, a vertical roller mill has been used as a pulverizer for pulverizing various raw materials such as coal, limestone, chemical, metal silicon, metal silicon, and battery materials.

  A vertical roller mill has a rotary table (including a table liner) that is arranged in a casing and rotates in a horizontal plane, and a material (a material to be crushed) on the rotary table by an arm driven by a pressurizing device using a hydraulic cylinder or the like. And a plurality of rollers that are pressed against the rotating table, and pulverizes the object to be crushed on the rotating table by a compression action and a friction action while the roller rotates.

  The vertical roller mill is configured such that when the object to be crushed does not exist on the rotary table at the start-up, or when the part of the object to be crushed on the rotary table decreases and breaks off as the pulverization progresses, There is a possibility of contact (metal touch) with the surface of the rotary table. If the operation is continued in this state, the surface of the roller or the rotary table may be damaged.

  Therefore, in order to prevent such damage, the vertical roller mill is provided with a stopper for stopping the lowering of the roller before reaching the surface of the rotary table when the roller is lowered (for example, a patent) Reference 1).

  Here, as the operating time of the vertical roller mill elapses, the surface of the roller and the surface of the rotary table are gradually worn by the grinding process. The interval between the roller and the rotary table when the descent stops is gradually increased, and the pulverization performance decreases.

  Therefore, adjust the stop position of the roller while grasping the wear status of the roller and table surface as the operating time elapses so that the interval with the rotary table when the roller stops its descent is appropriate. (Re-setting) can be performed.

  The stopper in the conventional vertical roller mill has a stopper body that has a male screw and penetrates the casing, and a female screw member that has a female screw that is screwed to the male screw and is supported by the casing, up to a set stop position. When the roller is lowered, the receiving portion attached to the arm comes into contact with the tip end portion (contact portion) of the stopper to stop the lowering of the roller.

  Setting, changing or adjusting the stop position of the roller is performed by rotating the stopper main body outside the casing by a driving device or manually to advance and retract the position of the stopper abutting portion in the casing (for example, patents). Reference 1).

  In a conventional vertical roller mill, an arm that holds a roller at the tip and swings up and down, a pressure device that drives the arm, and a stopper that stops the roller at a set position are all attached to the casing. It was supported.

  However, in the vertical roller mill, the pressing force against the rotary table is very large, and the load received by the stopper for stopping the lowering of the roller that has received such a large pressing force is also very large. Further, in the vertical roller mill, vibration is generated as the raw material is pulverized. Therefore, it is necessary for the casing to support such a large load and suppress vibration, and in addition to storing the powder, which is the original function, it is required to have sufficient rigidity, and its manufacturing cost is also large. It was.

  In view of this, for the purpose of suppressing vibrations and reducing costs, a roller mill having a structure in which a concrete frame integrally connected to the foundation concrete is provided and an arm or the like is supported by the concrete frame has been proposed.

  By the way, in the vertical roller mill adopting this concrete mount, since the arm that supports the roller disposed inside the casing in a swingable manner is supported by the concrete mount disposed outside the casing, It is difficult or impossible to adopt a conventional configuration in which a stopper main body penetrating the casing wall is supported by the casing wall and the stopper main body is advanced and retracted in a place where there is no spatial restriction outside the casing. It is difficult to form a through-hole in a concrete mount for inserting the stopper body, and it is difficult to ensure the strength of the mount and to ensure sufficient dimensional accuracy.

  For this reason, in a vertical roller mill employing a concrete mount, a stopper is provided in the narrow space between the mount and the casing on the front side (casing side) of the mount, and the stopper main body is moved back and forth in the narrow space. However, it is difficult to achieve this depending on the configuration of the conventional roller mill.

  In addition, vertical roller mills that use concrete mounts are often large mills, but large mills have a greater roller pressing force than small mills, and in addition to the stopper body when the rollers are lowered The power that can be gained is also great.

  For this reason, in a large vertical roller mill that uses a concrete mount, the contact area between the tip (contact part) of the stopper body and the receiving part of the arm that receives the stopper is increased as much as possible. It is necessary to prevent damage. For example, the contact part of the stopper body is formed separately from the other parts and attached via a spherical bearing or the like so that the contact part can tilt with respect to the other parts of the stopper body. It is conceivable that the contact portion tilts according to the inclination angle of the receiving portion.

  However, when a tilting mechanism such as a spherical bearing is used to enable tilting of the abutting portion of the stopper body, it is necessary to supply oil to the bearing of the tilting mechanism during maintenance, increasing the burden on the operator. In addition, since the entire length of the stopper body is increased due to the presence of the tilting mechanism, it is difficult to employ a stopper having a tilting mechanism when there is a restriction in the installation space of the stopper, such as a vertical roller mill employing a concrete mount. is there.

Japanese Patent Laid-Open No. 11-342347

  The present invention has been made in view of the above-described problems, and in a vertical roller mill in which an arm is provided on a concrete mount integrally connected to foundation concrete, a stop position when the roller is lowered is set. The purpose is to enable the stopper to be installed in a limited installation space without hindrance.

  In order to solve the above-described problems, a vertical roller mill according to a first aspect of the present invention includes a casing supported by foundation concrete, a concrete mount integrally connected to the foundation concrete, and the casing. A rotating table, a roller pressed against the object to be crushed on the rotating table by an arm supported by the concrete mount, and a stop position when the roller is lowered A stopper main body having a contact portion at a tip thereof that is in contact with a receiving portion formed on the arm, and adjusting the position of the stopper main body when the roller is lowered. Position adjusting means for adjusting the stop position of the first contact portion, the contact portion has a convex spherical shape, and the receiving portion is a concave corresponding to the convex spherical shape. Having a spherical shape, characterized in that.

  According to a second aspect of the present invention, in the first aspect, the position adjusting means includes a male screw formed on an outer peripheral surface of the stopper main body and a female screw that is screwed to the male screw. And is configured to rotate the stopper main body screwed into the female screw member to move the stopper main body forward and backward.

  According to a third aspect of the present invention, in the second aspect, the position adjusting means has a lever extending in a radial direction from the stopper main body, and operates the lever to rotate the stopper main body. It is comprised, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a plurality of the stoppers are arranged for one arm.

  According to the present invention, in a vertical roller mill in which an arm is provided on a concrete mount integrally connected to foundation concrete, a stopper for setting a stop position when the roller is lowered is hindered in a limited installation space. It can be installed without.

The front view which shows roughly the structure of the principal part of the vertical roller mill by one Embodiment of this invention. The right view of FIG. The longitudinal cross-sectional view which shows the structure of the stopper in the vertical roller mill shown in FIG. FIG. 4 is a left side view of FIG. 3. The longitudinal cross-sectional view which shows the state which the contact part of the stopper main body contact | abutted to the receiving part of the arm. The figure which shows the contact state (at the time of initial setting) of a contact part and a receiving part when setting the stop position of a roller in case a contact part is a plane (reference example). The figure which shows the contact state (at the time of reset) of a contact part and a receiving part when setting the stop position of a roller in case a contact part is a plane (reference example). The figure which shows the contact state of a contact part and a receiving part when changing the setting of the stop position of a roller using the stopper in the vertical roller mill shown in FIG. The figure which shows the contact state of a contact part and a receiving part when changing the setting of the stop position of a roller in the modification of the vertical roller mill shown in FIG.

  An embodiment of a vertical roller mill according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the vertical roller mill according to the present embodiment includes a rotary table (including a table liner) 17 that rotates around a vertical central axis inside a casing 19, and a raw material (a material to be crushed) on the rotary table 17. ) Pressed from above to crush the raw material, an arm 15 that presses the roller 14 toward the rotary table 17, a pressure device 16 that drives the arm 15 to generate a pressing force, and a roller 14 is provided with a stopper 9 for setting a stop position at the time of descent. The pressurizing device is constituted by, for example, a hydraulic cylinder.

  The turntable 17 is supported by a speed reducer 22 that is connected and installed on the foundation concrete 20.

  On the other hand, the arm 15 to which the roller 14 is connected to the tip thereof is supported by a concrete base 13 that is connected to the foundation concrete 20 independently of the speed reducer 22 through an intermediate portion passing through the wall of the casing 19. Has been.

  As described above, since the roller 14 is connected to the tip of the arm 15, the roller 14 is supported by the concrete mount 13 via the arm 15. Further, the pressurizing device 16 is directly supported by the foundation concrete 20.

  In this way, since the roller 14 and the arm 15 that exert a large pressing force for crushing are supported by the concrete base 13 having high strength and rigidity, stable support capable of suppressing the occurrence of vibration is ensured. In addition, the casing 19 and its internal structure can be simplified, and the manufacturing cost can be reduced.

  As shown in FIG. 2, the arm 15 is supported by a shaft 18 that is disposed on both the left and right sides of the arm 15 and is fitted to a bearing 21 that is supported by the upper portion of the gantry 13, and swings about the shaft 18. And a pressing force is generated on the roller 14 connected to the tip.

  As shown in FIG. 2, the concrete mount 13 is substantially symmetrical on the left and right with respect to the position (center) where the arm 15 is installed. An opening 23 is provided as a space for installation and operation of the stopper 9.

  Details of the stopper 9 are shown in FIGS. 3, 4, and 5. The stopper 9 includes a stopper main body 1 in which a male screw (position adjusting means) 11 is formed in a portion on the gantry 13 side, and a female screw member (position adjusting means) 2 in which a female screw 12 to be screwed with the male screw 11 is formed in the center. And. The female screw member 2 is attached to the gantry 13 by tightening with bolts 6 into tap holes formed in the attachment metal 3 connected to the plate-like embedded metal 10 provided on the gantry 13 by welding.

  At the tip of the stopper body 1, an abutting portion 7 that abuts on a receiving portion 8 formed on the arm 15 is formed. A plurality of levers (position adjusting means) 5 for rotating the stopper main body 1 are provided in the middle portion of the stopper main body 1 so as to extend in the radial direction.

  When the lever 5 is rotated in one direction by screwing the male screw 11 and the female screw 12, the stopper body 1 moves forward toward the arm 15, and when the lever 5 is rotated in the other direction, the stopper body 1 is separated from the arm 15. Go backwards in the direction.

  A nut 4 is screwed onto the male screw 11 of the stopper main body 1, and the stopper main body 1 can be fixed to the female screw member 2 by tightening the nut 4.

  The surface of the contact portion 7 is formed in a convex spherical shape, and the surface of the receiving portion 8 is formed in a concave spherical shape corresponding to the convex spherical shape of the surface of the contact portion 7. In the state shown in FIG. 5, the convex spherical surface of the contact portion 7 and the concave spherical surface of the receiving portion 8 are in surface contact.

  When wear occurs on the surface of the roller 14 and / or the surface of the rotary table 17 due to the lapse of the mill operation time, the interval between the roller 14 and the surface of the rotary table 17 when the lowering of the roller 14 is stopped by the stopper 9 is There is a possibility that the pulverization performance is lowered because the interval becomes larger than the initial setting. For this reason, it is necessary to change the setting of the stop position to lower the position where the lowering of the roller 14 is stopped to a position below the initially set position.

  Therefore, in order to lower the position when the roller 14 is stopped, it is necessary to move the position when the receiving portion 8 provided in the arm 15 is moved closer to the gantry 13. Need to reverse.

  By the way, when changing the setting of the stop position of the roller 14, the surface of the contact portion 7A and the surface of the receiving portion 8A are formed in a planar shape as in the reference example shown in FIGS. 6A and 6B. After changing the setting of the stop position, as shown in FIG. 6B, the contact portion 7A contacts the receiving portion 8A by point contact. In a roller mill that performs pulverization with a large load, when the roller 14 is lowered to the set stop position, the stopper also receives a large load. Therefore, a very large pressure is applied to the contact portion 7A and the receiving portion 8A by point contact. Can act and be damaged.

  On the other hand, in the vertical roller mill according to the present embodiment, the surface of the contact portion 7 of the stopper body 1 is formed in a convex spherical shape, and the surface of the receiving portion 8 of the arm 15 is the surface of the contact portion 7. Since the concave spherical shape corresponding to the convex spherical shape of the surface is formed, it is possible to prevent the contact portion 7 and the receiving portion 8 from being damaged by point contact.

  FIG. 7 shows a contact state between the contact portion 7 and the receiving portion 8 when the stop position setting is changed in the present embodiment.

  When the arm 15 rotates, the center position of the receiving portion 8 deviates from the central axis of the stopper main body 1, so that the contact portion between the contact portion 7 and the receiving portion 8 is the center of the stopper main body 1 as shown in FIG. Move downward from the shaft. Therefore, the curved surface formed in the receiving portion 8 is the outer periphery of the abutting portion 7 at all positions in the range of the abutting portion 7 corresponding to the positions of the uppermost or lowermost range assumed as the stopping position of the roller 14. It is formed in the range including the part.

  As a reference example, the surface shape of the contact portion 7 is not a spherical shape but a planar shape, and the contact portion 7 is formed separately and connected to the stopper body 1 via a spherical bearing. The following problems may occur.

  If a spherical bearing is used for a contact portion that receives a large load, the entire contact portion becomes large, and durability and reliability are reduced. In particular, the problem of size is difficult to realize in consideration of the operability when the lever 5 is rotated for the forward / backward operation of the stopper body 1 in the constrained space on the front side of the concrete mount 13. Become.

  In the operation of the vertical roller mill, the receiving part 8 which is a part of the arm 15 is usually located at a position away from the abutting part 7, and the roller 14 descends toward the rotary table 17 by the progress of crushing. As the arm 15 tilts, the receiving portion 8 approaches the contact portion 7, and when the roller 14 reaches the set stop position, the receiving portion 8 contacts the contact portion 7.

  In this way, until the roller 14 is lowered to the set stop position, the contact portion 7 is not in contact with the receiving portion 8 and is in an unconstrained state. The abutting portion 7 attached to the spherical bearing is inclined downward by its own weight around the spherical bearing, and as a result, when the receiving portion 8 approaches and abuts the abutting portion 7, both are properly applied. There is a possibility that you cannot touch.

  On the other hand, in this embodiment, since the spherical bearing is not required and the structure is very small, the stopper 9 having good operability is provided even in a narrow space on the front side of the gantry 13. realizable.

  In the vertical roller mill according to the present embodiment, the stopper body 1 is rotated by rotating the lever 7 in order to advance and retract the contact portion 7 for setting and changing the stop position of the roller 14. In the conventional roller mill that does not include the concrete mount 13, the stopper body can be rotated in an unconstrained space outside the casing. Therefore, these operations can be performed with a tool such as a large wrench. However, in this embodiment, by operating the lever, the stopper body 1 can be rotated without using a large tool as in the case of a conventional roller mill.

  As an example of a specific operation method, an operator enters a lower portion of the stopper 9 through an opening 23 at the lower center of the pedestal 13 and, if necessary, is a long rod-like shape having a Y-shaped handle at the tip. The lever 5 is rotated using the member. In this case, the lever 5 is rotated in both forward and reverse directions, while the rod-shaped member is rotated by pushing upward, so that it is preferable to provide at least two levers 5 at the left and right target positions. It is preferable to provide three or more so that there is no blind spot at the position where the lever 5 is pushed.

  However, if a large number of levers 5 are provided, the lever 5 on the front side becomes an obstacle to the operation of the rod-shaped member, so the number of levers 5 is preferably 5 to 6. In the example shown in FIG. 4, the number of levers is six. Note that if a hook having a shape folded back is formed at least at one end of the Y-shaped handle of the rod-shaped member, the lever 5 can be pulled forward by the hook, so the number of levers is one. But sometimes it ’s enough.

  Thereby, the stopper 9 which can be operated even in a narrow space on the front side of the gantry 13 can be realized.

  As another example of the lever operation method, the lever 5 may be operated by inserting a pipe.

  Further, the roller 14 presses the object to be crushed with a large pressing force by a pressure device 16 such as a hydraulic cylinder for crushing, and when the roller 14 reaches a set stop position, the pressing force is received by the stopper 9. become. Therefore, in order to secure a large pressing force stably in a narrow space with a small configuration with sufficient rigidity, two stoppers 9 are arranged adjacent to each other in the horizontal plane as shown in FIG. doing.

  As described above, according to the vertical roller mill of the present embodiment having the above-described configuration, the optimum stopper 9 for the arm 15 is realized in the vertical roller mill that supports the arm 15 with the concrete mount 13, particularly in the large-sized mill. can do.

  That is, the abutting portion 7 of the stopper 9 has a convex spherical shape, and the receiving portion 8 of the arm 15 has a concave spherical shape corresponding to the convex spherical shape of the abutting portion 7. A large contact area between the contact portion 7 and the receiving portion 8 can be ensured without providing a spherical bearing for enabling tilting. Thereby, the stopper 9 can be prevented from being enlarged and complicated in structure, and can be installed in a limited installation space without any trouble.

  Further, a position adjusting means for adjusting the position of the stopper main body 1 to adjust the stop position when the roller 14 is lowered, and the male screw 11 of the stopper main body 1 on the female screw 12 of the female screw member 2 provided on the concrete mount 13 are provided. Since the lever 5 is extended from the stopper body 1 in the radial direction while being screwed together, the protruding amount of the stopper body 1 is reduced, and the bending moment generated at the protruding portion of the stopper body 1 is reduced. be able to. Thereby, even in a large vertical roller mill, breakage of the stopper body 1 can be prevented.

1 Stopper body 2 Female thread member (position adjustment means)
3 Mounting hardware 4 Nut 5 Lever (Position adjusting means)
6 Bolt 7 Abutting portion 8 Receiving portion 9 Stopper 10 Implant 11 Metal screw (position adjusting means)
12 Female thread (position adjustment means)
13 Concrete mount 14 Roller 15 Arm 16 Pressure device 17 Rotating table (including table liner)
18 Oscillating shaft 19 Casing 20 Foundation concrete 21 Bearing 22 Reducer 23 Opening

Claims (4)

A casing supported by the foundation concrete, a concrete pedestal integrally connected to the foundation concrete, a turntable disposed in the casing, and an arm supported by the concrete pedestal, the covering on the turntable A roller that is pressed against the pulverized material to pulverize the material to be crushed, and a stopper that sets a stop position when the roller is lowered,
The stopper includes a stopper main body having a contact portion abutting on a receiving portion formed on the arm, and a stop position when the roller is lowered by adjusting a position of the stopper main body. A position adjusting means,
The contact roller has a convex spherical shape, and the receiving portion has a concave spherical shape corresponding to the convex spherical shape.   The position adjusting means includes a male screw formed on the outer peripheral surface of the stopper main body, and a female screw member that is formed on the concrete mount, and a female screw member that is threadedly engaged with the male screw. The vertical roller mill according to claim 1, wherein the stopper main body is configured to rotate and move the stopper main body forward and backward.   The saddle type roller mill according to claim 2, wherein the position adjusting means includes a lever extending in a radial direction from the stopper main body, and is configured to operate the lever to rotate the stopper main body. The vertical roller mill according to any one of claims 1 to 3, wherein a plurality of the stoppers are arranged for one arm.

Images