CN114643107A - Manufacturing method of grinding roller material blocking assembly of vertical roller mill - Google Patents
Manufacturing method of grinding roller material blocking assembly of vertical roller mill Download PDFInfo
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- CN114643107A CN114643107A CN202210350909.4A CN202210350909A CN114643107A CN 114643107 A CN114643107 A CN 114643107A CN 202210350909 A CN202210350909 A CN 202210350909A CN 114643107 A CN114643107 A CN 114643107A
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/007—Mills with rollers pressed against a rotary horizontal disc
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
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Abstract
The invention discloses a method for manufacturing a grinding roller material blocking assembly of a vertical roller mill, which is characterized by comprising the following steps of: this grinding roller material stopping assembly of vertical roller mill includes mill, several grinding roller, installs the striker plate in the pan feeding mouth side of every grinding roller through the support assembly, and above-mentioned grinding roller material stopping assembly manufacturing method: 1) determining the structural parameters of a grinding disc and a grinding roller according to the design time of a grinding machine and the basic data of the grindability of materials; 2) calculating the structure and position parameters of the striker plate, and 3) manufacturing the striker plate; 4) manufacturing a bracket assembly; 5) opening a hole in a mill shell and slotting a wind ring armor ring; 6) manufacturing a sealing plate; 7) manufacturing an outer support; 8) and installing and welding a wear-resistant pull rod sheath. The grinding roller material blocking assembly for manufacturing the vertical roller mill by adopting the technical scheme always ensures that the lower mill runs stably with a low material blocking ring height, so that fine powder at the bottom of the grinding disc is easier to leave the grinding disc, the content of the fine powder of the grinding disc is reduced, the stability of a material layer is improved, the grinding efficiency is improved, and the power consumption of grinding is reduced when the grinding roller mill stands.
Description
Technical Field
The invention belongs to a vertical roller mill, and particularly relates to a method for manufacturing a grinding roller material blocking assembly of the vertical roller mill.
Background
The vertical roller mill is called as a vertical mill for short, and the grinding principle is material layer grinding, namely, grinding of materials is realized by mutual extrusion between particles, and the controllability of the grinding process is good, and the grinding efficiency is high. The prior structural schematic diagram of the vertical roller mill unit is shown in figure 7.
The working principle of the existing structure is as follows: the new feeding and powder selecting machine feed back into the middle of the grinding disc by the bin under the action of gravity, the grinding disc rotates to drive the material to rotate, the material moves from the middle of the grinding disc to the edge of the grinding disc under the action of centrifugal force, when the material moves to the lower part of the grinding roller, the grinding roller extrudes the material (material layer) under the action of force F and the combined action of the material retaining ring, the material is ground, the ground material passes over the material retaining ring under the action of centrifugal force, leaves the grinding disc, falls into the air ring under the action of gravity, and is then upwards brought into the powder selecting machine on the upper part of the grinding machine by high-speed air flow in the air ring, qualified finished products are selected by the powder selecting machine, unqualified large particles are mixed with the new feeding through the bin and then are reground to continue grinding until the ground finished products meet the granularity requirement.
The vertical roller mill integrates grinding, drying and powder selection, has compact structure, simple system, large drying capacity and strong adaptability to materials, is widely applied to grinding of various materials such as cement raw materials, clinker, industrial solid wastes, metallurgical slag and the like, but has the biggest common problem of poor controllability of a material layer compared with a roller press which is used for grinding the material layer, and the only means for controlling the material layer is the adjustment of the height of a material retaining ring of a grinding disc. The material blocking height is increased, the controllability of a material layer is improved, but the grinding efficiency is reduced; the material blocking height is reduced, the grinding efficiency is increased, but the material layer is thinned, the controllability is reduced, and the vibration of a grinder is increased; for equipment based on a material bed grinding principle, the controllability of a material bed directly influences the stability and the grinding efficiency of a grinding machine, so that the same materials are ground under common conditions, and the power consumption of a main machine of a vertical roller mill is about 0.5-1 kWh/t higher than that of a roller mill.
According to the analysis of the dynamic calculation result of the simulation of the discrete element of the material movement of the vertical roller grinding disc, the material on the grinding disc can be divided into A, B, C three areas: the material in the area A can completely enter the lower part of the grinding roller and can be ground, the material in the area B is directly thrown out by the grinding disc through the gap between the two grinding rollers and is not ground by the grinding roller (namely, the bypass material), and the material in the area C is ground by the grinding roller. Because the areas A and B are materials which are not rolled by the grinding rollers, the area B is not theoretically needed from the viewpoint of improving the grinding efficiency and the stability of the mill, namely as long as the materials are not rolled, the materials are expected to completely enter the lower parts of the grinding rollers for rolling so as to generate more fine powder. Generally speaking, with the increase of the equipment specification, the higher the system yield, the lower the system power consumption, but the vertical roller mill is developed from 50-60 t/h to 500-600 t/h, and the main reason that the mill efficiency is not obviously improved is that the bypass amount of the B area is increased to increase the ineffective circulation amount in the mill, thereby offsetting the contribution of the increase of the mill to the mill efficiency.
Because the materials in the C area are rolled by the grinding roller, a large amount of fine powder is mixed in the material layer, and the fine powder in the materials in the C area is theoretically required to be completely discharged from the viewpoint of improving the grinding efficiency of the material layer, but because of the existence of the material retaining ring of the grinding disc, the fine powder mixed in the material layer below the height of the material retaining ring is discharged by the rotation and the extrusion of the grinding roller, most of the fine powder is remained at the bottom of the grinding area, and the content of the fine powder with the particle size less than or equal to 80 mu m in the materials in the C area reaches 18-20% according to the statistical data of industrial production. A large amount of fine powder is remained at the bottom of the grinding disc to increase the fluidity of the material layer, so that the stability of the material layer is damaged, on one hand, the vibration of the grinding machine is caused, on the other hand, the grinding efficiency is reduced, the current of the grinding machine is reduced, the time of the grinding machine is reduced, the power consumption is increased, and meanwhile, the grain composition of a ground finished product is narrowed due to the increase of the internal circulation load of the grinding machine, and the quality and the performance of the finished product are influenced.
In summary, the common problems of the current vertical roller mill are as follows:
1) the controllability of a material layer is poor, and the height of a material stop ring of the grinding disc is in technical conflict with the stability and the grinding efficiency of the grinding machine;
2) the bypass material that can not be rolled by the grinding roller exists between the adjacent grinding roller, and the mill is big more, the grinding roller is less, the mill rotational speed is higher more, and the bypass volume is big more, increases the interior useless circulation of mill, reduces mill efficiency.
3) A large amount of fine powder which is not discharged in time is mixed in the material layer below the height of the material blocking ring, so that the stability of the material layer is damaged, the grinding efficiency is reduced, and the power consumption of a system is increased.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method for manufacturing the grinding roller material blocking assembly of the vertical roller mill, which is used for reducing the height of the material blocking ring, improving the grinding efficiency and improving the product quality.
The invention is realized in this way, a method for manufacturing a grinding roller material blocking assembly of a vertical roller mill is characterized in that: the grinding roller material blocking assembly of the vertical roller mill comprises a grinding disc and a plurality of grinding rollers, wherein a material blocking plate is arranged on the side of a feeding port of each grinding roller through a support assembly, and the manufacturing method of the grinding roller material blocking assembly comprises the following steps:
1) determining the diameter D of the grinding disc according to the design time of the grinding machine and the basic data of the grindability of the material and the conventional design method for model selection of the grinding machinetDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
2) Calculating the structure and position parameters of the striker plate:
the baffle plate is a V-shaped baffle plate inclined towards the center of the grinding roller, a reflecting plate is arranged on the side close to the grinding roller, and a blocking plate is arranged on the other side; a wear-resistant layer is arranged on the centripetal side of the V-shaped striker plate, and the HRC (Rockwell hardness) of the wear-resistant layer is more than or equal to 50;
calculating the structural position parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2：
Wherein L is1Length of interception segment of striker plate, L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The radial positioning gap between the vertex (the connecting point of the interception section and the reflection section) of the striker plate and the inner side of the striker ring, d3Distance of arc of reflecting section from positioning gap of grinding roller, d4Distance between the front end of the reflection section and the axis of the grinding roller is vertically positioned by a gap H1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The positioning height of the striker plate from the grinding disc lining plate;
α＝40±10° (1)
β＝160±10° (2)
d1＝20±10mm (3)
d2＝20±10mm (4)
d3＝0～10mm (5)
d4＝(0.1～0.2)Dr1 (6)
h1＝(0.02～0.04)(Dr1+Dr2) (7)
h2＝h1±10mm (8)
H1＝200～350mm (9)
R1＝0.5Dr1+d3 (10)
L1＝π(15～20)Dt/360 (12)
3) manufacturing striker plate
The technological structural parameter H of the striker plate obtained by calculation according to the step 2)1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; then according to the striker plateWelding the striker plate at an angle beta, and paying attention to the fact that the wear-resistant layer is arranged on one side of the angle beta;
4) manufacturing a bracket assembly: the lifting support assembly comprises an inner support structure positioned above a grinding disc, the inner support structure comprises two inner support pull rods, the two inner support pull rods are connected with an inner support transverse plate, inner support side rib plates are welded on the inner support transverse plate and matched with an outer support to movably support the inner support on a mill shell, and the end parts of the inner support pull rods above the grinding disc are fixedly connected with a material baffle plate through locking nuts; an outer support is arranged on the outer side of the mill shell, the other end of the inner support pull rod penetrates through the mill shell and extends out of an outer support panel of the outer support, and the outer support is fixed on the mill shell through a pull rod nut on the outer side of the outer support; a pull rod mounting hole for penetrating and mounting an inner support pull rod is designed on the mill shell, the pull rod mounting hole is a long hole along the height direction of the grinding disc, and a sealing plate is sleeved on the inner support pull rod outside the pull rod mounting hole; an internal thread component is fixed in the outer support, a screw rod is screwed in the internal thread component, the upper end of the screw rod extends upwards along the height direction of the grinding disc, a screw rod bearing device is fixedly arranged on the outer side of the grinding machine shell close to the upper end of the screw rod, and a height adjusting power head is arranged at the upper end of the screw rod;
the inner support pull rod extends out of the shell of the mill by 200-250 mm and penetrates through the inner side of the material baffle by 80-120 mm;
the inner support transverse plates are two, the two inner support transverse plates are made of 20 x a x b steel plates, the width a is 150-200 mm, and the length b is (0.7-0.8) L1(ii) a The two inner support transverse plates are distributed on two sides of the wind ring armor ring and are welded with the inner support pull rod, and the inner support side rib plates are welded with the outer inner support transverse plates;
5) opening a hole in a mill shell and slotting an air ring armor ring:
according to the position size d of the striker plate1、d2、d3、d4、h2The center distance between two inner support pull rods of the inner support and the distance between the central line of the inner support pull rod and the uppermost edge of the striker plate are 100mm, the inner support pull rod is positioned at the center of the opening of the mill shell, and then two c x h openings are formed3The shape of the hole is as follows,the width c of the square hole is equal to the diameter of the inner support pull rod +10mm, and the height h3＝150±20mm；
A U-shaped groove with a corresponding height is formed in the wind ring armor ring in the radial direction corresponding to the hole formed in the mill shell, and the depth of the U-shaped groove is determined according to the principle of installation and height adjustment of the non-interference support pull rod;
6) manufacturing a sealing plate:
the width of the sealing plate (2.5 +/-0.1) c, wherein c is the width of the square-hole; height h of sealing plate4＝(2.0±0.1)h3(ii) a The sealing plate is tightly close to the outer wall of the mill shell when being installed and then is glued on the inner support pull rod;
7) manufacturing an external support:
manufacturing an outer bracket and a height adjusting device according to a conventional mechanical design;
8) installation:
firstly, placing an inner support in a U-shaped groove of a wind ring armor ring, then penetrating the outer side part of a side rib plate of the inner support out of a return hole of a mill shell, then penetrating out of a corresponding hole position of an outer support, enabling the side rib plate of the inner support to abut against the inner wall of the mill shell, and then screwing and fixing by using a pull rod nut; secondly, installing a material baffle plate, and adjusting the gap between the material baffle plate and the inner side of a material baffle ring by using a pull rod nut to meet d1、d2Requiring;
9) welding a wear-resistant pull rod sheath:
and welding a V-shaped pull rod sheath to the pull rod between the wind ring armor ring and the striker plate, wherein the wear-resistant surface of the pull rod sheath faces outwards.
The grinding roller material blocking assembly of the vertical roller mill manufactured by the method mainly solves three key common problems of limiting the efficiency exertion of the material layer grinding principle of the vertical roller mill, and mainly comprises three common problems of poor controllability of material layers of the vertical roller mill, large bypass quantity between adjacent grinding rollers, inclusion of a large amount of fine powder which is not discharged in time below the height of a material blocking ring and the like. According to the technical scheme, the same materials are ground, the host efficiency of the vertical roller mill is close to that of the roller press, and meanwhile, the advantage that the vertical roller mill is easy to enlarge compared with the roller press is fully utilized, so that the efficiency of the roller press is reached or exceeded; in addition, the grinding efficiency is improved, the internal circulation load of the mill is low, the air quantity for the system is small, and the system resistance is low, so that the aims of reducing the power consumption of the fan and the power consumption of the system are fulfilled. Compared with the working condition without the material baffle plate, the amount of the material which is not rolled and passes through the bypass between the adjacent grinding rollers is reduced by 50-60%, the effective material layer thickness and the grinding capacity are increased, and the important guarantee is provided for reducing the height of the material baffle ring and improving the grinding efficiency. The pressure of the grinding roller is adjusted, and under the same condition, compared with the traditional vertical roller milling technology, the height of the material blocking ring of the material blocking plate is reduced by 15-20%, the statistical average yield is increased by 10.8%, and the power consumption of the main machine is reduced by 13.7%.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 2a is an enlarged view of a portion of FIG. 1;
FIG. 2b is a schematic structural view of a V-shaped striker plate;
FIG. 3 is a view from the direction A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is an expanded view from direction C to direction D of FIG. 2;
FIG. 6 is a cross-sectional view E-E of FIG. 4;
fig. 7 is a schematic diagram of the structure of the conventional vertical roller mill unit.
In the figure, 1, a grinding disc; 2. grinding the roller; 3. a bracket assembly; 3-10, inner support pull rod; 3-11, inner support transverse plate; 3-12 parts of inner support side rib plates; 3-13, a pull rod sheath; 3-14, locking nut; 4. a striker plate; 4-1, a reflecting plate; 4-2, a interception plate; 5. a mill housing; 5-1, a pull rod mounting hole; 5-2, sealing plates; 6. an outer support; 7. a draw rod nut; 8. an internally threaded member; 9. a lead screw; 10. a screw bearing device; 11. a height adjusting power head; 12. a material blocking ring; 13. wind ring armor ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 6, a method for manufacturing a grinding roller material blocking assembly of a vertical roller mill comprises a grinding disc 1 and a plurality of grinding rollers 2, wherein a material blocking plate 4 is installed on the feed inlet side of each grinding roller through a bracket assembly 3, the bracket assembly is fixedly connected with a mill shell 5, and the method for manufacturing the grinding roller material blocking assembly comprises the following steps:
1) determining the diameter D of the grinding disc according to the design time of the grinding machine and the basic data of the grindability of the material and the conventional design method for model selection of the grinding machinetDiameter D of large end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
2) Calculating the structure and position parameters of the striker plate:
the material baffle is a V-shaped material baffle inclined towards the center of the grinding roller, the side close to the grinding roller is provided with a reflecting plate 4-1, and the side far away from the grinding roller is provided with a interception plate 4-2; a wear-resistant layer is arranged on the centripetal side of the V-shaped striker plate, and the HRC (Rockwell hardness) of the wear-resistant layer is more than or equal to 50;
calculating the structural position parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2：
Wherein L is1Length of interception segment of striker plate L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The radial positioning gap between the vertex (the connecting point of the interception section and the reflection section) of the striker plate and the inner side of the striker ring, d3The arc of the reflecting section is spaced from the positioning gap of the grinding roller, d4Distance between the front end of the reflection section and the axis of the grinding roller is vertically positioned by a gap H1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The positioning height of the striker plate from the grinding disc lining plate;
α＝40±10° (1)
β＝160±10° (2)
d1＝20±10mm (3)
d2＝20±10mm (4)
d3＝0～10mm (5)
d4＝(0.1～0.2)Dr1 (6)
h1＝(0.02～0.04)(Dr1+Dr2) (7)
h2＝h1±10mm (8)
H1＝200～350mm (9)
R1＝0.5Dr1+d3 (10)
L1＝π(15～20)Dt/360 (12)
3) manufacture of material baffle plate
The technological structural parameter H of the striker plate obtained by calculation according to the step 2)1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; then welding the striker plate according to the striker plate angle beta, and paying attention to the fact that the wear-resistant layers are arranged on one side of the beta angle;
4) manufacturing a bracket assembly: the lifting support assembly 3 comprises an inner support structure 3-1 positioned above the grinding disc, the inner support structure comprises two inner support pull rods 3-10, pull rod sheaths 3-13 are sleeved on the inner support pull rods, the service life of the pull rods is prolonged, and the pull rod sheaths are V-shaped structures; the two inner support pull rods are connected with inner support transverse plates 3-11, the inner support transverse plates are connected with inner support side rib plates 3-12 of the mill shell, and the inner support transverse plates are matched with the outer support to movably support the inner support on the mill shell; the end part of the inner support pull rod above the grinding disc is fixedly connected with a material baffle plate 4 through locking nuts 3-14; an outer bracket 6 is arranged outside the mill shell, the other end of the inner bracket pull rod penetrates through the mill shell and extends out of an outer bracket panel 6-1 of the outer bracket, and the outer bracket is fixed on the mill shell 5 through a pull rod nut 7 at the outer side of the outer bracket 6; the grinding mill is characterized in that a pull rod mounting hole 5-1 for mounting an inner support pull rod in a penetrating manner is formed in the mill shell, a long hole is formed in the pull rod mounting hole along the height direction of the grinding disc, and a sealing plate 5-2 is sleeved on the inner support pull rod outside the pull rod mounting hole; an internal thread component 8 is fixed in the outer support, a screw rod 9 is screwed in the internal thread component, the upper end of the screw rod extends upwards along the height direction of the grinding disc, a screw rod bearing device 10 is fixed on the outer side of the grinding machine shell close to the upper end part of the screw rod, and a height adjusting power head 11 is arranged at the upper end part of the screw rod; the adjusting power head is a hand wheel or a plane clamping part convenient for clamping, wherein the plane clamping part adopts a triangular head, a square or a hexagonal structure.
The inner support pull rod extends out of the shell of the mill by 200-250 mm and penetrates through the inner side of the material baffle by 80-120 mm;
the inner support transverse plates are two, the two inner support transverse plates are made of 20 x a x b steel plates, the width a is 150-200 mm, and the length b is (0.7-0.8) L1(ii) a The two inner support transverse plates are distributed on two sides of the wind ring armor clamping ring and are welded with the inner support pull rod, and the inner support side rib plates are welded with the outer inner support transverse plates;
5) opening a hole in a mill shell and slotting a wind ring armor ring 13:
according to the position size d of the striker plate1、d2、d3、d4、h2The center distance between two inner support pull rods of the inner support and the distance between the central line of the inner support pull rod and the uppermost edge of the striker plate are 100mm, the inner support pull rod is positioned at the center of the opening of the mill shell, and then two c x h openings are formed3The width c of the square hole is equal to the diameter of the inner support pull rod plus 10mm, and the height h of the square hole is equal to the diameter of the inner support pull rod3＝150±20mm；
A U-shaped groove with a corresponding height is formed in the wind ring armor ring in the radial direction corresponding to the hole formed in the mill shell, and the depth of the U-shaped groove is determined according to the principle of installation and height adjustment of the non-interference support pull rod;
6) manufacturing a sealing plate:
the width of the sealing plate (2.5 +/-0.1) c, wherein c is the width of the square hole; height h of sealing plate4＝(2.0±0.1)h3(ii) a The sealing plate is tightly close to the outer wall of the mill shell when being installed and then is glued on the inner support pull rod;
7) manufacturing an external support:
manufacturing an outer bracket and a height adjusting device according to a conventional mechanical design;
8) installation:
firstly, placing an inner support in a U-shaped groove of a wind ring armor ring, then penetrating the outer side part of a side rib plate of the inner support out of a return hole of a mill shell, then penetrating out of a corresponding hole position of an outer support, enabling the side rib plate of the inner support to abut against the inner wall of the mill shell, and then screwing and fixing by using a pull rod nut; secondly, installing a striker plate, and adjusting the gap between the striker plate and the inner side of a striker ring by using a pull rod nut to meet d1、d2Requiring;
9) welding a wear-resistant pull rod sheath:
and welding a V-shaped pull rod sheath to the pull rod between the wind ring armor ring and the striker plate, wherein the wear-resistant surface of the pull rod sheath faces outwards.
In the above technical scheme, preferably, a wear-resistant layer is arranged on the centripetal side of the V-shaped striker plate, and the wear-resistant surface hardness HRC of the wear-resistant layer is greater than or equal to 50.
The baffle plate scheme is mainly used for solving the problem that the material extruded by the grinding roller in front of the grinding roller is not rolled, the structure of the baffle plate is a V-shaped folded plate as a whole, the front part and the rear part of the baffle plate are divided into two sections, the side close to the grinding roller is provided with a reflecting plate, and the side far away from the grinding roller is provided with a blocking plate; the reflecting plate is a blocking section and mainly has the main functions of reversely pushing the materials extruded by the grinding roller to the lower part of the grinding roller by utilizing the momentum reflection principle for grinding, so that the thickness of the blanking layer is increased under the same condition, the stability of the grinding machine is improved, more fine powder is generated after grinding under the condition of ensuring the pressure of the grinding roller, and the improvement of the grinding machine time is facilitated; the intercepting plate section has the main functions of intercepting part of the material in the area B without being directly bypassed through grinding by the grinding roller, conveying the material to the back intercepting section under the action of rotation of the grinding disc, and reversely pushing the material back by the back intercepting section reflecting plate to enter the lower part of the grinding roller for grinding, so that the material layer thickness and the fine powder amount are further increased, and the grinding time of a grinder is increased.
The material motion control realization process is as follows: the material drops to the mill from central unloading pipe under the action of gravity, and rotate together with the mill, receive centrifugal force and blanking impact dispersion from the mill center to the motion of mill edge, the part material (about 30%) direct motion that is higher than the striker ring is rolled to the roller mill below, another part material (about 40%) motion that is higher than the striker ring is terminal to the striker plate, move to the roller mill below along the striker plate, and forced to send to the roller big end grinding district and grind by striker plate front end V type reverse folded plate, compare the operating mode that does not have the striker plate, the material volume that is not rolled of bypass reduces 50% -60% between the adjacent roller, increase effective bed of material thickness and grinding ability, for reducing the striker ring height, improve grinding efficiency and provide important guarantee.
In the traditional vertical roller mill without the striker plate process, the thickness of a material layer is mainly realized by the height of the striker ring, so that the increase of the striker height is a common practice of the operation of the vertical roller mill in order to improve the stability of the mill when the stand of the mill is used. However, as mentioned above, increasing the height of the material blocking ring can limit the discharge of fine powder at the bottom of the grinding disc, destroy the stability of the material layer and reduce the grinding efficiency. Under the same condition, the material baffle can effectively improve the thickness of a material layer, so that the height of the material baffle ring is reduced, the stable operation of the mill under the low height of the material baffle ring is ensured, fine powder at the bottom of the mill can more easily leave the mill, the content of the fine powder of the mill is reduced, the stability of the material layer is improved, the grinding efficiency is improved, and the power consumption of grinding is reduced when the mill is used. According to the statistical data of an industrial test mill of a certain TRM38.4 raw material mill in Tianjin institute, under the same condition, the height of the material blocking ring of the material blocking plate is reduced by 15-20%, the statistical average yield is increased by 10.8%, and the power consumption of a main machine is reduced by 13.7%. The industrial test data are shown in table 1.
TABLE 1 TRM38.4 raw meal mill striker plate millstone material motion control scheme industrial test data
According to the statistical data of industrial tests in table 1, under the same conditions, compared with the traditional vertical roller mill technology without the material baffle plate, the material baffle plate can reduce the height of the material baffle ring by 26.6%, the statistical average output is increased by 10.8%, the power consumption of a main machine is reduced by 13.7%, and the technical effects that the material motion of a grinding disc is controlled after the material baffle plate is implemented in the aspects of improving the stability of a grinding mill and improving the grinding efficiency are proved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A manufacturing method of a grinding roller material blocking assembly of a vertical roller mill is characterized by comprising the following steps: the grinding roller material blocking assembly of the vertical roller mill comprises a grinding disc and a plurality of grinding rollers, wherein a material blocking plate is arranged on the side of a feeding port of each grinding roller through a support assembly, and the manufacturing method of the grinding roller material blocking assembly comprises the following steps:
1) determining the diameter D of the grinding disc according to the design time of the grinding machine and the basic data of the grindability of the material and the conventional design method for model selection of the grinding machinetDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
2) Calculating the structure and position parameters of the striker plate:
the baffle plate is a V-shaped baffle plate inclined towards the center of the grinding roller, the side close to the grinding roller is provided with a reflecting plate, and the side far away from the grinding roller is provided with a blocking plate; a wear-resistant layer is arranged on the centripetal side of the V-shaped striker plate, and the HRC (Rockwell hardness) of the wear-resistant layer is more than or equal to 50;
calculating the structural position parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2：
Wherein L is1Length of interception segment of striker plate L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The vertex of the striker plate (the connecting point of the interception section and the reflection section) is separated from the radial positioning gap at the inner side of the striker ring,d3the arc of the reflecting section is spaced from the positioning gap of the grinding roller, d4The front end of the reflection section is vertically positioned at a clearance H from the axis of the grinding roller1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The positioning height of the striker plate from the grinding disc lining plate;
α＝40±10° (1)
β＝160±10° (2)
d1＝20±10mm (3)
d2＝20±10mm (4)
d3＝0～10mm (5)
d4＝(0.1～0.2)Dr1 (6)
h1＝(0.02～0.04)(Dr1+Dr2) (7)
h2＝h1±10mm (8)
H1＝200～350mm (9)
R1＝0.5Dr1+d3 (10)
L1＝π(15～20)Dt/360 (12)
3) manufacturing striker plate
According to the striker plate technological structure parameter H calculated in the step 2)1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; then welding the striker plate according to the striker plate angle beta, wherein the wear-resistant layers are arranged on one side of the beta angle;
4) manufacturing a bracket assembly: the lifting support assembly comprises an inner support structure positioned above the grinding disc, the inner support structure comprises two inner support pull rods, the two inner support pull rods are connected with an inner support transverse plate, inner support side rib plates are welded on the inner support transverse plate and are matched with the outer support to movably support the inner support on a mill shell, and the end parts of the inner support pull rods above the grinding disc are fixedly connected with a baffle plate through locking nuts; an outer support is arranged on the outer side of the mill shell, the other end of the inner support pull rod penetrates through the mill shell and extends out of an outer support panel of the outer support, and the outer support is fixed on the mill shell through a pull rod nut on the outer side of the outer support; a pull rod mounting hole for penetrating and mounting an inner support pull rod is designed on the mill shell, the pull rod mounting hole is a long hole along the height direction of the grinding disc, and a sealing plate is sleeved on the inner support pull rod outside the pull rod mounting hole; an internal thread component is fixed in the outer support, a lead screw is screwed in the internal thread component, the upper end of the lead screw extends upwards along the height direction of the grinding disc, a lead screw bearing device in threaded fit with the lead screw is fixedly arranged on the outer side of the mill shell close to the upper end of the lead screw, and a height adjusting power head is arranged at the upper end of the lead screw;
the inner support pull rod extends out of the shell of the mill by 200-250 mm and penetrates through the inner side of the material baffle by 80-120 mm;
the inner support transverse plates are two, the two inner support transverse plates are made of 20 x a x b steel plates, the width a is 150-200 mm, and the length b is (0.7-0.8) L1(ii) a The two inner support transverse plates are distributed on two sides of the wind ring armor ring and are welded with the inner support pull rod, and the inner support side rib plates are welded with the outer inner support transverse plates;
5) opening a hole in a mill shell and slotting an air ring armor ring:
according to the position size d of the striker plate1、d2、d3、d4、h2The distance between the centers of the two inner support pull rods and the distance between the central line of the inner support pull rod and the uppermost edge of the striker plate are 100mm, the two inner support pull rods are positioned at the center of the opening of the mill shell, and then two c multiplied by h openings are formed3The width c of the square hole is equal to the diameter of the inner support pull rod plus 10mm, and the height h of the square hole is equal to the diameter of the inner support pull rod3＝150±20mm；
A U-shaped groove with a corresponding height is formed in the air ring armor ring in the radial direction corresponding to the opening of the mill shell, and the depth of the U-shaped groove is determined on the basis of the principle of non-interference in the installation of the support pull rod and the height adjustment;
6) manufacturing a sealing plate:
the width of the sealing plate (2.5 +/-0.1) c, wherein c is the width of the square hole; height h of sealing plate4＝(2.0±0.1)h3(ii) a The sealing plate is tightly close to the outer wall of the mill shell when being installed and then is glued on the inner support pull rod;
7) manufacturing an external support:
manufacturing an outer bracket and a height adjusting device according to a conventional mechanical design;
8) installation:
firstly, placing an inner support in a U-shaped groove of a wind ring armor ring, then penetrating the outer side part of a side rib plate of the inner support out of a return hole of a mill shell, then penetrating out of a corresponding hole position of an outer support, enabling the side rib plate of the inner support to abut against the inner wall of the mill shell, and then screwing and fixing by using a pull rod nut; secondly, installing a material baffle plate, and adjusting the gap between the material baffle plate and the inner side of a material baffle ring by using a pull rod nut to meet d1、d2Requiring;
9) welding a wear-resistant pull rod sheath:
and welding a V-shaped pull rod sheath to the pull rod between the wind ring armor ring and the striker plate, wherein the wear-resistant surface of the pull rod sheath faces outwards.
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| CN113457793A (en) * | 2021-07-20 | 2021-10-01 | 天津水泥工业设计研究院有限公司 | Design method of vertical mill grinding structure with different grinding areas |
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