Structure and method for manufacturing crusher tooth head inlaid with hard alloy through die casting

Abstract

The invention discloses a structure and method for manufacturing a crusher tooth head inlaid with hard alloy through die casting, and belongs to the technical field of crusher tooth heads, the structure comprises the hard alloy, an iron alloy matrix and a middle pressing plate, the top and the bottom of the middle pressing plate are provided with an upper pressing plate and a lower pressing plate respectively, and the bottom of the lower pressing plate is provided with an ejection main plate; a fireproof tray is arranged at the top of the lower pressing plate, a tooth portion pressing head is arranged in the upper pressing plate, a heat insulation pad is arranged at the top of the tooth portion pressing head, and a tightening bolt is arranged at the top of the upper pressing plate. According to the structure and method for manufacturing the crusher tooth head inlaid with the hard alloy through die casting, due to the plastic deformation effect of pressure, the forging and pressing effect is generated, an iron alloy matrix is denser, shrinkage porosity and shrinkage cavities are reduced, crystal grains are small, breakage dislocation is caused, dislocation is increased, the comprehensive mechanical performance of the matrix is greatly improved, and the service life of the crusher tooth head is prolonged. The gap between the iron alloy matrix and the hard alloy is finer, wrapping is tighter and firmer, and due to the existence of the hard alloy, the abrasion resistance of the tooth head area is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of crusher tooth heads, and in particular to a structure and method for manufacturing a crusher tooth head inlaid with hard alloy by die casting. Background Art

[0002] Crusher, also known as stone crusher, is a pulverizing machine used in the processing of metal and non-metallic ores. It can break the mined raw ore into small particles by extrusion and bending. Commonly used crushing machines include jaw crusher, gyratory crusher, cone crusher, roll crusher, hammer crusher and impact crusher. Crusher is an important equipment in the production of coal, limestone, marble and quartz stone mining industries. The main component of the crusher is the crushing tooth roller. When working, the tooth head of the tooth roller is in direct contact with the ore for crushing, which makes the tooth head of the crusher tooth roller seriously worn. When the tooth head is worn to a certain extent, the tooth roller will be scrapped.

[0003] The existing crusher tooth head often loses teeth when crushing higher hardness ores or mixing other miscellaneous materials into lower strength ores, which will make the ore output particle size fail to meet the requirements and even cause the tooth roller to be scrapped. When crushing higher hardness ores, the existing tooth head wears more seriously, shortening the service life of the crushing tooth roller, resulting in frequent replacement, affecting the quality and output of the ore. Especially when crushing high-hardness ores such as marble or quartz stone, the impact on ore output and cost is more severe due to the short life of the crushing roller. Summary of the invention

[0004] In order to solve the problem of frequent tooth loss, shortened service life and frequent replacement, the present invention provides a structure and method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting, and the technical solution is as follows:

[0005] A structure of a crusher tooth head inlaid with hard alloy made by die casting, comprising a middle pressure plate, a main body cavity is opened inside the middle pressure plate, an upper pressure plate and a lower pressure plate are respectively arranged at the top and bottom of the middle pressure plate, and an ejection main plate is arranged at the bottom of the lower pressure plate;

[0006] A refractory tray is arranged on the top of the lower pressure plate, and circular holes are arranged around the inside of the refractory tray. A toothed pressure head is arranged inside the upper pressure plate, a cushion block is arranged on the top of the ejection main board, and a pressure block is arranged on the top of the middle pressure plate.

[0007] Preferably, a rounded cavity is provided at the top of the lower pressure plate, a fixing hole is provided at the bottom of the rounded cavity, and the refractory tray is located inside the rounded cavity.

[0008] Preferably, an ejector rod is provided on the top of the ejector main board, the ejector rod extends to the inside of the fixing hole, and the cushion block is movably connected to the lower pressing plate and the ejector main board.

[0009] Preferably, the fillet cavity is provided with a cemented carbide extending into the main body cavity, the main body cavity is provided with an iron alloy matrix extending into the fillet cavity, and the bottom of the tooth pressure head extends into the main body cavity.

[0010] Preferably, a circular cavity is provided inside the upper pressure plate, a thermal insulation pad is provided on the top of the tooth pressure head, a fastening bolt is provided on the top of the upper pressure plate, the tooth pressure head, the thermal insulation pad and the fastening bolt are all located inside the circular cavity, the thermal insulation pad is located between the tooth pressure head and the fastening bolt, and an internal thread threadedly connected to the fastening bolt is provided on the upper side of the inner wall of the circular cavity.

[0011] Preferably, positioning grooves are arranged around the tops of the middle pressure plate, the lower pressure plate and the ejection main board, and positioning pins corresponding to the positions of the positioning grooves and having the same sizes as the positioning pins are arranged around the bottoms of the upper pressure plate, the middle pressure plate and the lower pressure plate.

[0012] A method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting, comprising the following steps:

[0013] S1: First, conduct idling trial production to check whether the equipment can operate properly;

[0014] S2: Clean the cemented carbide, remove dust, sludge, rust and dirt on the surface, and then dry it. Then, spray a layer of high-temperature resistant special coating on the clean cemented carbide surface after drying, and dry it.

[0015] S3: lift the upper pressing plate by the press until there is enough distance between the tooth pressure head and the middle pressure plate, insert the processed set amount of cemented carbide into the round hole of the refractory tray, and spray a layer of refractory coating at the connection between the middle pressure plate and the tooth pressure head;

[0016] S4: before pouring, a cushion block is placed between the ejector main plate and the lower pressure plate, and after the ferroalloy matrix is ​​smelted, it is poured into the main body cavity of the middle pressure plate at a suitable tapping temperature;

[0017] S5: After pouring is completed, the upper pressing plate is moved downward by a press machine. After the upper pressing plate drives the tooth pressure head to contact the ferroalloy matrix, the press machine maintains appropriate pressure for a certain period of time;

[0018] S6: After cooling, lift the upper pressure plate until there is enough distance between the tooth pressure head and the middle pressure plate, place a pressure block on the middle pressure plate and remove the cushion block, so that the press machine presses the middle pressure plate through the pressure block, and the ejector rod will eject it to obtain the cemented carbide tooth head. After cleaning, cutting and grinding the cemented carbide tooth head, heat treatment can be carried out according to the heat treatment process of the ferroalloy matrix.

[0019] Preferably, the cemented carbide material is one or more of high chromium cast iron, high speed steel, tungsten carbide or vanadium carbide and other cemented carbides.

[0020] Preferably, the material of the ferroalloy matrix is ​​one or more ferroalloys such as ductile iron, medium-low high carbon alloy steel, high manganese steel or high chromium cast iron.

[0021] Preferably, the number of the cemented carbide is one or more.

[0022] Beneficial effects:

[0023] The beneficial effects produced by the technical solution of the present invention are as follows:

[0024] The structure and method of manufacturing a crusher tooth head inlaid with cemented carbide by die casting. The crusher tooth head inlaid with cemented carbide manufactured by this method applies a certain pressure to the tooth head when the ferroalloy matrix of the tooth head has just solidified, and maintains it for a period of time, so that the tooth head has a plastic deformation when the pressure is initially applied, resulting in a forging effect, making the ferroalloy matrix denser, reducing shrinkage and shrinkage cavities, making the grains fine, interrupting dislocations, and increasing dislocations, greatly improving the comprehensive mechanical properties of the matrix, and due to the plastic deformation effect of the pressure, the gap between the ferroalloy matrix and the cemented carbide is made smaller, and the package is more tightly and firmly. Due to the presence of cemented carbide, the wear resistance of the tooth head area is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall assembly structure of a crusher tooth head inlaid with hard alloy made by die casting according to the present invention;

[0027] Figure 2 It is a cross-sectional view of the combined state of the structural hard alloy and the ferroalloy matrix of a crusher tooth head inlaid with hard alloy produced by die casting according to the present invention;

[0028] Figure 3It is a top view structural schematic diagram of a structural refractory tray of a crusher tooth head inlaid with hard alloy made by die casting of the present invention;

[0029] Figure 4 It is a schematic diagram of a top view of a structural lower pressure plate of a crusher tooth head inlaid with hard alloy produced by die casting according to the present invention;

[0030] Figure 5 It is a schematic diagram of a top view of a pressure plate in a structure of a crusher tooth head inlaid with hard alloy produced by die casting according to the present invention;

[0031] Figure 6 It is a schematic diagram of a top view of the structure of an upper pressure plate of a crusher tooth head inlaid with hard alloy produced by die casting according to the present invention;

[0032] Figure 7 It is a top view structural schematic diagram of a structural tightening bolt of a crusher tooth head inlaid with hard alloy made by die casting of the present invention;

[0033] Figure 8 It is a schematic diagram of a top view of a main board of a crusher tooth head inlaid with hard alloy produced by die casting according to the present invention;

[0034] Fig. 9 The invention discloses a method for manufacturing a crusher tooth head inlaid with hard alloy by die casting, and a diagram of a hard alloy tooth head inlaid with hard alloy;

[0035] Fig.10 The invention discloses a method for manufacturing a crusher tooth head inlaid with hard alloy by die casting, and a cross-sectional view of the inlaid hard alloy tooth head.

[0036] In the figure, 1, cemented carbide; 2, ferroalloy matrix; 3, refractory tray; 4, lower pressure plate; 5, middle pressure plate; 6, upper pressure plate; 7, tooth pressure head; 8, thermal insulation pad; 9, tightening bolts; 10, ejector main board; 11, cushion block; 12, pressure block. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figure 1As shown, a structure of a crusher tooth head inlaid with cemented carbide made by die casting includes a cemented carbide 1, a ferroalloy substrate 2 and a middle pressure plate 5, an upper pressure plate 6 and a lower pressure plate 4 are respectively arranged on the top and bottom of the middle pressure plate 5, and an ejector main plate 10 is arranged at the bottom of the lower pressure plate 4;

[0039] The cemented carbide 1 is arranged around the inside of the ferroalloy matrix 2 and the bottom ends extend to the outside. A refractory tray 3 is arranged on the top of the lower pressure plate 4. The ferroalloy matrix 2 is located inside the middle pressure plate 5. A tooth pressure head 7 is arranged inside the upper pressure plate 6. An insulating pad 8 is arranged on the top of the tooth pressure head 7. A tightening bolt 9 is arranged on the top of the upper pressure plate 6. A cushion block 11 is arranged on the top of the ejection main board 10. A pressure block 12 is arranged on the top of the middle pressure plate 5.

[0040] In this embodiment, it is mainly used to make a crushing tooth head inlaid with cemented carbide, the overall operation is convenient, and the comprehensive mechanical properties of the matrix are improved.

[0041] like Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, a rounded cavity is provided at the top of the lower pressure plate 4, a fixing hole is provided at the bottom of the rounded cavity, the refractory tray 3 is located inside the rounded cavity, circular holes are provided on all sides of the interior of the refractory tray 3, the bottom of the cemented carbide 1 is located inside the circular hole, an ejector rod is provided at the top of the ejector main board 10, and the ejector rod extends to the inside of the fixing hole. The setting of the fixing hole facilitates the entry of the ejector rod, and the pad 11 is movably connected to the lower pressure plate 4 and the ejector main board 10.

[0042] In this embodiment, the circular hole serves to fix the cemented carbide 1 so that it does not shift or deform when pouring the molten iron into the ferroalloy matrix 2. At the same time, the use of refractory materials at the circular hole can also slow down the solidification of the molten iron at the rounded corners of the tooth head, so that the molten iron at the tooth head solidifies almost at the same time. When pressure is applied, the entire tooth head undergoes plastic deformation, thereby improving the overall mechanical properties of the tooth head. One or more openings can be designed according to the requirements for placing the cemented carbide 1.

[0043] like Figure 5 , Figure 6 and Figure 7 As shown, a main cavity is opened inside the middle pressure plate 5, the ferroalloy substrate 2 is located inside the main cavity, the bottom of the tooth pressure head 7 extends to the inside of the main cavity, and a circular cavity is arranged inside the upper pressure plate 6. The tooth pressure head 7, the thermal insulation pad 8 and the fastening bolt 9 are all located inside the circular cavity. An internal thread threadedly connected to the fastening bolt 9 is arranged on the upper side of the inner wall of the circular cavity. The arrangement of the internal thread facilitates the fastening of the tooth pressure head 7.

[0044] In this embodiment, the thermal insulation pad 8 has a good thermal insulation effect. Its size must match the size of the circular cavity in the upper pressure plate 6. The material must be heat-resistant and heat-insulating material and can withstand a certain pressure. The purpose is to prevent the tightening bolt 9 from damaging the thread due to excessive temperature and to keep the assembled upper pressure plate 6 in a tightened state.

[0045] In addition, the tightening bolt 9 can be designed as a hexagon socket countersunk bolt or a common bolt as needed, and its diameter and thread size must match the upper pressing plate 6.

[0046] like Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, positioning grooves are arranged around the tops of the middle pressure plate 5, the lower pressure plate 4 and the ejection main board 10, and positioning pins corresponding to the positions of the positioning grooves and matching in size are arranged around the bottoms of the upper pressure plate 6, the middle pressure plate 5 and the lower pressure plate 4.

[0047] In this embodiment, the provision of the positioning grooves and the positioning pins not only facilitates the combination of the components, but also plays a role in limiting the position, thereby preventing the components from deflecting and shaking as much as possible.

[0048] Among the above-mentioned accessories, the main body cavity in the middle pressure plate 5 in contact with the molten iron and the tooth pressure head 7 need to be made of heat-resistant steel materials, and the rest can be made of ordinary steel materials.

[0049] like Figures 1 to 8 As shown, a method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting comprises the following steps:

[0050] S1: According to the sizes of the cemented carbide 1 and the ferroalloy substrate 2, a refractory tray 3, a lower pressure plate 4, a middle pressure plate 5, an upper pressure plate 6 and a tooth pressure head 7 of corresponding sizes are manufactured, and the above accessories are assembled and fastened with a universal accessory heat insulation pad 8, a tightening bolt 9 and an ejector main board 10. The material of the cemented carbide 1 is one or more of high chromium cast iron, high speed steel, tungsten carbide or vanadium carbide and other cemented carbides, and the material of the ferroalloy substrate 2 is one or more of ferroalloys such as ductile iron, medium-low high carbon alloy steel, high manganese steel or high chromium cast iron;

[0051] S2: After the assembly is completed, no molten iron is added and the idling trial production is carried out to check whether the equipment can operate properly;

[0052] S3: Clean the cemented carbide 1 to remove dust, sludge, rust, etc. on the surface, and then dry it. Then, spray a layer of high-temperature resistant special coating on the surface of the clean cemented carbide 1 after drying, and dry it.

[0053] S4: lift the upper pressing plate 6 by a press until there is a sufficient distance between the tooth pressure head 7 and the middle pressing plate 5, insert the processed set number of cemented carbides 1 into the circular hole of the refractory tray 3, and spray a layer of refractory coating at the connection between the middle pressing plate 5 and the tooth pressure head 7. The purpose of the refractory coating is to prevent the molten iron from welding or adhesion with the cavity, and avoid damage to the cavity and the pressure head;

[0054] S5: before pouring, the pad 11 is placed between the ejector main plate 10 and the lower pressure plate 4, and after the ferroalloy matrix 2 is smelted, it is poured into the main body cavity of the middle pressure plate 5 at a suitable tapping temperature;

[0055] S6: After the pouring is completed, the upper pressing plate 6 is moved downward by a press machine, and after the tooth pressing head 7 contacts the ferroalloy matrix 2, the press machine maintains appropriate pressure for a certain period of time;

[0056] S7: After cooling, lift the upper pressure plate 6 until there is enough distance between the tooth pressure head 7 and the middle pressure plate 5, place the pressure block 12 on the middle pressure plate 5 and remove the cushion block 11, so that the press machine presses down the middle pressure plate 5 through the pressure block 12. The cushion block 11 and the pressure block 12 are also universal accessories, and the ejector rod will eject them to obtain a cemented carbide tooth head. After cleaning, cutting and grinding the cemented carbide tooth head, it can be heat treated according to the heat treatment process of the ferroalloy substrate 2.

[0057] In this embodiment, since cemented carbide is mainly a high-carbon compound or powder metallurgy ceramic, etc., it has problems such as low melting point or difficulty in wetting with molten iron. In step S3, a special high-temperature resistant coating is sprayed on the surface of the cemented carbide 1 to prevent the wear resistance of the cemented carbide from deteriorating due to encountering high-temperature molten iron; in step S6, the newly solidified molten iron is pressurized and maintained for a period of time in order to utilize plastic deformation to make the gap between the ferroalloy matrix 2 and the cemented carbide 1 smaller and the combination more tightly and firmly.

[0058] like Fig. 9 As shown, the size and shape of the cast-in cemented carbide tooth head manufactured by this method are basically consistent with the required size and shape, and can meet the design requirements.

[0059] like Fig.10 As shown, in the cast-in cemented carbide tooth head manufactured by this method, the cemented carbide and the ferroalloy matrix are well combined, and the cemented carbide is not melted.

[0060] The invention provides a method for preparing a crusher tooth head inlaid with hard alloy by die casting, which can significantly improve the wear resistance of the crusher tooth roller and increase the service life, and has a high promotion significance.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A structure of a crusher tooth head inlaid with hard alloy made by die casting, characterized in that: include: A middle pressure plate (5), wherein a main body cavity is provided inside the middle pressure plate (5), an upper pressure plate (6) and a lower pressure plate (4) are provided at the top and bottom of the middle pressure plate (5), respectively, and an ejection main plate (10) is provided at the bottom of the lower pressure plate (4); A refractory tray (3) is arranged on the top of the lower pressure plate (4), and circular holes are arranged on all four sides of the interior of the refractory tray (3). A toothed pressure head (7) is arranged inside the upper pressure plate (6), a cushion block (11) is arranged on the top of the ejection main plate (10), and a pressure block (12) is arranged on the top of the middle pressure plate (5).

2. The structure of a crusher tooth head inlaid with cemented carbide made by die casting according to claim 1, characterized in that: A rounded cavity is arranged on the top of the lower pressing plate (4), a fixing hole is arranged on the bottom of the rounded cavity, and the refractory tray (3) is located inside the rounded cavity.

3. The structure of a crusher tooth head inlaid with cemented carbide made by die casting according to claim 2, characterized in that: An ejector rod is provided at the top of the ejector main board (10), and the ejector rod extends to the inside of the fixing hole. The cushion block (11) is movably connected to the lower pressing plate (4) and the ejector main board (10).

4. The structure of a crusher tooth head inlaid with cemented carbide made by die casting according to claim 2, characterized in that: The fillet cavity is provided with a hard alloy (1) extending into the main body cavity, the main body cavity is provided with an iron alloy matrix (2) extending into the fillet cavity, and the bottom of the tooth pressure head (7) extends into the main body cavity.

5. The structure of a crusher tooth head inlaid with cemented carbide produced by die casting according to claim 1, characterized in that: A circular cavity is arranged inside the upper pressure plate (6), a heat insulating pad (8) is arranged on the top of the tooth pressure head (7), a tightening bolt (9) is arranged on the top of the upper pressure plate (6), the tooth pressure head (7), the heat insulating pad (8) and the tightening bolt (9) are all located inside the circular cavity, the heat insulating pad (8) is located between the tooth pressure head (7) and the tightening bolt (9), and an internal thread threadedly connected to the tightening bolt (9) is arranged on the upper side of the inner wall of the circular cavity.

6. The structure of a crusher tooth head inlaid with cemented carbide made by die casting according to claim 1, characterized in that: The middle pressure plate (5), the lower pressure plate (4) and the ejection main plate (10) are all provided with positioning grooves on all sides of the top, and the upper pressure plate (6), the middle pressure plate (5) and the lower pressure plate (4) are all provided with positioning pins corresponding to the positions of the positioning grooves and having sizes matching the positioning grooves on all sides of the bottom.

7. A method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting according to claims 1-6, characterized in that: The following steps are involved: S1: First, conduct idling trial production to check whether the equipment can operate properly; S2: Clean the cemented carbide (1) to remove dust, sludge, rust and dirt on the surface, and then dry it. Then, spray a layer of high-temperature resistant special coating on the surface of the clean cemented carbide (1) after drying, and dry it. S3: The upper pressing plate (6) is lifted by a press until there is a sufficient distance between the tooth pressing head (7) and the middle pressing plate (5), a set number of processed cemented carbides (1) are inserted into the circular holes of the refractory tray (3), and a layer of refractory coating is sprayed on the connection between the middle pressing plate (5) and the tooth pressing head (7); S4: before pouring, a cushion block (11) is placed between the ejector main plate (10) and the lower pressure plate (4), and after the ferroalloy matrix (2) is smelted, it is poured into the main body cavity of the middle pressure plate (5) at a suitable tapping temperature; S5: After the pouring is completed, the upper pressing plate (6) is moved downward by a press machine, and after the upper pressing plate (6) drives the tooth pressing head (7) to contact the ferroalloy matrix (2), the press machine maintains appropriate pressure for a certain period of time; S6: After cooling, the upper pressure plate (6) is lifted until there is a sufficient distance between the tooth pressure head (7) and the middle pressure plate (5), a pressure block (12) is placed on the middle pressure plate (5) and the cushion block (11) is removed, so that the press machine presses down the middle pressure plate (5) through the pressure block (12), and the ejector rod will eject it to obtain a cemented carbide tooth head. After cleaning, cutting and grinding the cemented carbide tooth head, heat treatment can be carried out according to the heat treatment process of the ferroalloy matrix (2).

8. The method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting according to claim 7, characterized in that: The hard alloy (1) material is one or more of high chromium cast iron, high speed steel, tungsten carbide or vanadium carbide hard alloy.

9. The method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting according to claim 7, characterized in that: The material of the ferroalloy matrix (2) is one or more of ductile iron, medium-low high carbon alloy steel, high manganese steel or high chromium cast iron alloy.

10. The method for manufacturing a crusher tooth head inlaid with cemented carbide by die casting according to claim 7, characterized in that: The number of the hard alloy (1) is one or more.

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