CN107185651B - Sectional type material throwing head for rotor of vertical shaft impact crusher and application method thereof - Google Patents
Sectional type material throwing head for rotor of vertical shaft impact crusher and application method thereof Download PDFInfo
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- CN107185651B CN107185651B CN201710578907.XA CN201710578907A CN107185651B CN 107185651 B CN107185651 B CN 107185651B CN 201710578907 A CN201710578907 A CN 201710578907A CN 107185651 B CN107185651 B CN 107185651B
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- hard alloy
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- rotor
- throwing head
- sectional
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- 239000000463 material Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 78
- 239000000956 alloy Substances 0.000 claims abstract description 78
- 238000005219 brazing Methods 0.000 claims abstract description 48
- 239000000945 filler Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 30
- 230000004907 flux Effects 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
- B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
A sectional type throwing head for a rotor of a vertical shaft impact crusher comprises a throwing head hammer body, a hammer body groove and sectional type hard alloy strips; the sectional hard alloy strip consists of at least two hard alloy support strips; the hammer body of the material throwing head is provided with a hammer body groove, and the sectional hard alloy strips are placed in the hammer body groove. According to the invention, the problem of service life of the rotor is solved by starting with the material throwing head in the rotor, the problem of hard alloy strip breakage caused by mechanical property differences of the hammer body of the material throwing head and hard alloy is avoided by adopting the sectional hard alloy strip, meanwhile, the bonding strength is improved to more than 150MPa by adopting a brazing process, the service life of the material throwing head is prolonged by more than 30%, and the maintenance period of the rotor is prolonged.
Description
Technical Field
The invention relates to building material crushing equipment, in particular to a vertical shaft impact crusher, in particular to a throwing head for a rotor of the vertical shaft impact crusher.
Background
The vertical shaft impact crusher is a high-rotation-speed crushing device, in practice, because the service life of the vertical shaft broken rotor is too short and the repair rate is too high, technicians often improve the structure and the installation mode of the rotor in order to prolong the service life of the rotor, for example, in the period 4 of modern machinery 2013, the improvement design of the rotor of the vertical shaft impact crusher is pointed out that in order to prolong the service life of the rotor, the improvement is that:
1. the rotor throwing head is directly inserted into the round holes of the upper disc and the lower disc, and the throwing head adopts a high wear-resistant buffer plug-in throwing head, so that the impact resistance is improved, and the service life of the rotor is prolonged;
2. the inner and outer protecting rings are fixed on the inner and outer circles of the rotor body by bolts, so that the dynamic balance of the rotor is ensured, and the rotor is not easy to damage;
3. the rotor structure is made of high-wear-resistance and high-strength steel;
4. buffered alloys or wear blocks are added to the rotor.
With these measures, the service life of the rotor is not effectively prolonged.
Disclosure of Invention
The invention aims to solve the technical problem of short service lives of a material throwing head and a rotor, and provides a material throwing head with long service life for a rotor of a vertical shaft impact crusher.
In order to solve the problems, the invention adopts the following technical scheme:
a throwing head for a rotor of a vertical shaft impact crusher comprises a throwing head hammer body, a hammer body groove and a sectional hard alloy strip; the sectional hard alloy strip consists of at least two hard alloy support strips; the hammer body of the material throwing head is provided with a hammer body groove, and the sectional hard alloy strips are placed in the hammer body groove.
The hammer body groove is in clearance fit with the sectional hard alloy strip, and the clearance between the hammer body groove and the sectional hard alloy strip is 0.1-0.5 mm.
Brazing filler metal and flux for brazing are placed in gaps between the hammer body grooves and the segmented hard alloy strips.
The brazing filler metal is silver-based or copper-based brazing filler metal, the welding flux is fluxing welding flux, brazing is melted through high-temperature heating, the molten brazing filler metal between the sectional hard alloy strips and the throwing head hammer body is ensured to be completely filled, the brazing filler metal is cooled along with the box in the heat preservation box, and gaps between two sides are filled with the brazing filler metal to fixedly connect the sectional hard alloy strips and the throwing head hammer body through a brazing technology.
The width between two adjacent hard alloy support strips is 0.1-3 mm; and brazing filler metal and flux for brazing are placed between two adjacent hard alloy support strips.
A method for solving the problem of breakage of a throwing head in a vertical shaft impact breaking rotor comprises the following steps:
(1) under the working state of vertical shaft impact breaking, carrying out finite element analysis on the stress condition of the material throwing head in the rotor, and finding out a plurality of stress concentration points of the material throwing head;
(2) determining the number of segments of the segmented hard alloy strip according to the stress concentration point;
(3) the sectional type hard alloy strips are placed in the hammer body grooves, brazing filler metal and flux are placed in gaps between the hammer body grooves and the sectional type hard alloy strips, brazing is melted through high-temperature heating, the fact that the molten brazing filler metal between the sectional type hard alloy strips and the throwing head hammer body is completely filled is guaranteed, the sectional type hard alloy strips are cooled along with the hammer body in the heat preservation box, and the brazing filler metal is filled in gaps at two sides to fixedly connect the alloy strips with the hammer body through a brazing technology.
The number of segments of the segmented cemented carbide strip is calculated by the following formula:
L1=a*n*L2；
wherein:
l1 is the total length of the hammer body of the material throwing head or the total length of the hard alloy strip;
a-correction factor;
n-the number of segments of the cemented carbide strip;
l2-rotor allows maximum feed size of material;
the correction coefficient a is related to the section coefficients of the sectional hard alloy strip and the hammer body of the throwing head and the maximum feeding size of the material, and the range of the correction coefficient a is 1.1-3.
According to the invention, the problem of service life of the rotor is solved by starting with the material throwing head in the rotor, the problem of hard alloy strip breakage caused by mechanical property differences of the hammer body of the material throwing head and hard alloy is avoided by adopting the sectional hard alloy strip, meanwhile, the bonding strength is improved to more than 150MPa by adopting a brazing process, the service life of the material throwing head is prolonged by more than 30%, and the maintenance period of the rotor is prolonged.
Drawings
Fig. 1 is a schematic view of the mounting position of the polishing head.
Fig. 2 is a perspective view of the slinger head.
Fig. 3 is a front view of the slinger head.
Detailed Description
In practice, the reason for this problem is sought because the service life of the vertical shaft rotor is too short. Multiple experiments show that the speed of the material in the rotor is up to 60-85 m/s when the material is thrown away from the throwing head in the rotor, so that the action force of the material on the throwing head in the rotor is larger, and the throwing head serving as the protection rotor is important to the influence on the service life of the rotor. At present, a throwing head for a rotor of a vertical shaft impact crusher is used for bonding a hard alloy strip and a hammer body through a bonding agent, and the structure and the process have the following problems: 1. the hard alloy strips in the material throwing head fall off: the hammer body of the material throwing head and the hard alloy strip are bonded by adopting an adhesive, but the bonding strength is generally lower (the bonding strength is generally lower than 40 MPa); 2. the hard alloy strips in the material throwing head are extremely easy to break in the use process, and the rotor of the vertical shaft impact crusher is worn, so that the normal operation of equipment is seriously influenced.
Because the hard alloy strips in the material throwing head in the rotor are extremely easy to break in the use process, the service life of the rotor is greatly shortened. However, the service life of the material throwing head is greatly prolonged. It is easy to think that changing the material of the cemented carbide strip and selecting a material with good strength and ductility, such as changing the type of steel, etc., but the effect is not ideal from the practical working point of view.
Through deep analysis by the technicians, it is found that: firstly, the hammer body bonded with the hard alloy strip is made of carbon steel or alloy steel, and the stress of the hard alloy strip is too concentrated and the hard alloy strip breaks due to the large difference between the mechanical properties of the hard alloy and the carbon steel or alloy steel. Secondly, the size of the materials entering the vertical shaft is too large, the length of the hard alloy strips is too long, and the abrasion and destructive impact of the materials on the hard alloy strips are large. The above reasons are combined to cause that the throwing head of the rotor of the vertical shaft impact crusher is extremely easy to break in the use process.
After finding out the cause, technicians have improved the throwing head.
As shown in fig. 1-3, a throwing head for a rotor of a vertical shaft impact crusher comprises a throwing head hammer body 1, a hammer body groove 3 and a sectional hard alloy strip 2; the hammer body 1 of the material throwing head is provided with a hammer body groove 3, and the sectional hard alloy strips 2 are placed in the hammer body groove 3. The sectional cemented carbide strip 2 described above is composed of at least two cemented carbide strips.
The hammer body groove and the sectional hard alloy strip are in clearance fit, and the clearance at the two sides is 0.1 mm-0.5 mm, namely any value of 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm can be obtained. In addition, the sectional cemented carbide strips are equal or unequal in length.
The width between two adjacent hard alloy support strips is 0.1-3 mm, namely the width can be any value in the middle, such as 0.1mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm and the like; and brazing filler metal and flux for brazing are placed between two adjacent hard alloy support strips.
Brazing filler metal and flux for brazing are placed in gaps between the hammer body grooves and the segmented hard alloy strips. The brazing filler metal is silver-based or copper-based brazing filler metal, the welding flux is fluxing welding flux, brazing is melted through high-temperature heating, the fact that the molten brazing filler metal between the segmented hard alloy strip and the throwing head hammer body is completely filled is guaranteed, the brazing filler metal is cooled along with the box in the heat preservation box, and gaps between two sides are filled with the brazing filler metal to fixedly connect the alloy strip and the hammer body through a brazing technology.
A method for solving the problem of breakage of a throwing head in a vertical shaft impact breaking rotor comprises the following steps:
(1) under the working state of vertical shaft impact breaking, carrying out finite element analysis on the stress condition of the material throwing head in the rotor, and finding out a plurality of stress concentration points of the material throwing head;
(2) determining the number of sections of the hard alloy strips according to the stress concentration points;
(3) and placing the hard alloy strips in the hammer body grooves, placing brazing filler metal and flux in gaps between the hammer body grooves and the sectional hard alloy strips, melting the brazing filler metal by high-temperature heating, ensuring that the molten brazing filler metal between the sectional hard alloy strips and the throwing head hammer body is completely filled, cooling along with the box in the heat preservation box, and fixedly connecting the alloy strips and the hammer body by brazing technology by filling the brazing filler metal in gaps at two sides.
The number of the segments of the segmented hard alloy strip is calculated by the following formula:
L1=a*n*L2，
wherein:
l1 is the total length of the hammer body of the material throwing head or the total length of the hard alloy strip;
a-correction factor;
n-the number of segments of the hard alloy strip;
l2-rotor allows maximum feed size of material;
the correction coefficient a is related to the section coefficients of the sectional hard alloy strip and the hammer body of the throwing head and the maximum feeding size of the material, and the range of the correction coefficient a is 1.1-3.
Finally, it should be noted that: the above examples are provided for the purpose of clearly illustrating the invention and are not to be construed as limiting the invention to the embodiments, and other variations and modifications of the invention may be made by those skilled in the art based on the above description, which are not intended to be exhaustive or obvious and are therefore within the scope of the invention.
Claims (6)
1. A segmented throw head for a vertical shaft impact crusher rotor, characterized by: the device comprises a throwing head hammer body (1), a hammer body groove (3) and a sectional hard alloy strip (2); the sectional hard alloy strip (2) consists of at least two hard alloy branch strips; the hammer body (1) of the material throwing head is provided with a hammer body groove (3), and the sectional hard alloy strips (2) are placed in the hammer body groove (3);
under the working state of vertical shaft impact breaking, carrying out finite element analysis on the stress condition of the material throwing head in the rotor, and finding out a plurality of stress concentration points of the material throwing head; determining the number of segments of the segmented cemented carbide strip (2) according to the stress concentration point, wherein the number of segments of the segmented cemented carbide strip is calculated by the following formula:
L1=a*n*L2；
wherein:
l1 is the total length of the hammer body of the material throwing head or the total length of the hard alloy strip;
a-correction factor;
n-the number of segments of the cemented carbide strip;
l2-rotor allows maximum feed size of material;
the correction coefficient a is related to the section coefficients of the sectional hard alloy strip and the hammer body of the throwing head and the maximum feeding size of the material, and the range of the correction coefficient a is 1.1-3.
2. The segmented thrower head for a rotor of a vertical shaft impact crusher of claim 1, wherein: the hammer body groove (3) is in clearance fit with the sectional hard alloy strip (2), and the clearance at the two sides is 0.1-0.5 mm.
3. A segmented throw head for a rotor of a vertical shaft impact crusher according to claim 2, characterized in that: brazing filler metal and flux for brazing are placed in a gap between the hammer body groove (3) and the segmented hard alloy strip (2).
4. A segmented thrower head for a rotor of a vertical shaft impact crusher according to claim 3, characterized in that: the brazing filler metal is silver-based or copper-based, the welding flux is fluxing welding flux, the brazing is melted through high-temperature heating, the fact that the molten brazing filler metal is completely filled between the sectional hard alloy strips (2) and the throwing head hammer body (1) is guaranteed, the brazing filler metal is filled in gaps between two sides, and the sectional hard alloy strips (2) and the throwing head hammer body (1) are fixedly connected through a brazing technology.
5. The segmented thrower head for a rotor of a vertical shaft impact crusher of claim 1, wherein: the width between two adjacent hard alloy support strips is 0.1-3 mm; and brazing filler metal and flux for brazing are placed between two adjacent hard alloy support strips.
6. The method for solving the problem of breakage of the throwing head in the vertical shaft impact breaking rotor is characterized by comprising the following steps of:
(1) under the working state of vertical shaft impact breaking, carrying out finite element analysis on the stress condition of the material throwing head in the rotor, and finding out a plurality of stress concentration points of the material throwing head;
(2) determining the number of segments of the segmented hard alloy strip (2) according to the stress concentration points;
(3) placing the sectional hard alloy strips (2) in the hammer body grooves (3), placing brazing filler metal and flux in gaps between the hammer body grooves and the sectional hard alloy strips, melting the brazing filler metal through high-temperature heating, ensuring that the molten brazing filler metal between the sectional hard alloy strips and the throwing head hammer body is completely filled, cooling the sectional hard alloy strips along with the hammer body in a heat insulation box, and fixedly connecting the alloy strips and the hammer body through a brazing technology by filling the brazing filler metal in gaps at two sides;
the number of segments of the segmented cemented carbide strip is calculated by the following formula:
L1=a*n*L2；
wherein:
l1 is the total length of the hammer body of the material throwing head or the total length of the hard alloy strip;
a-correction factor;
n-the number of segments of the cemented carbide strip;
l2-rotor allows maximum feed size of material;
the correction coefficient a is related to the section coefficients of the sectional hard alloy strip and the hammer body of the throwing head and the maximum feeding size of the material, and the range of the correction coefficient a is 1.1-3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710578907.XA CN107185651B (en) | 2017-07-17 | 2017-07-17 | Sectional type material throwing head for rotor of vertical shaft impact crusher and application method thereof |
| RU2017143346A RU2671388C1 (en) | 2017-07-17 | 2017-12-12 | Rotor crushing element used in impact crusher with vertical shaft and method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710578907.XA CN107185651B (en) | 2017-07-17 | 2017-07-17 | Sectional type material throwing head for rotor of vertical shaft impact crusher and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107185651A CN107185651A (en) | 2017-09-22 |
| CN107185651B true CN107185651B (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710578907.XA Active CN107185651B (en) | 2017-07-17 | 2017-07-17 | Sectional type material throwing head for rotor of vertical shaft impact crusher and application method thereof |
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| CN (1) | CN107185651B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756277B (en) * | 2019-09-12 | 2021-06-01 | 来宾市兴宾区日昌升新材料有限公司 | Material throwing head of vertical shaft type crusher |
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| JPH0252048A (en) * | 1988-08-12 | 1990-02-21 | Kobe Steel Ltd | Preparation of impact element for impact type crusher |
| JPH05345139A (en) * | 1992-06-11 | 1993-12-27 | Babcock Hitachi Kk | Roller type grinding apparatus and grinding method using the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107185651A (en) | 2017-09-22 |
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