Grate plate of single-tooth crusher and surfacing method thereof

Abstract

The invention discloses a single-tooth crusher grate plate and a surfacing method thereof.The single-tooth crusher grate plate comprises a grate plate body, a grid structure and a wear-resistant hard face welding layer, a mounting groove is reserved in a wear area at the top of the grate plate body, the grid structure is welded and mounted in the mounting groove, and the grid structure comprises a supporting plate, a partition plate and an inclined plate; the two supporting plates are symmetrically distributed in the inclined direction and fixedly connected through a plurality of partition plates, the cross section of the two supporting plates is in an inverted trapezoid shape, a plurality of inclined plates used as rib plate supports are installed on the outer sides of the supporting plates, abrasion-resistant hard face welding layers are arranged in grids of the grid structure in a surfacing mode, and the abrasion-resistant hard face welding layers are higher than the grids. And the wear-resistant hard-surface welding layer is subjected to filling welding by adopting a hard-surface flux-cored wire with high carbon, high chromium and high refractory alloy content. By means of the mode, the probability that a hard face is peeled off in a large block mode is effectively reduced, the service life of the grid plate is prolonged, and the interlayer bonding strength and the overall performance of a surfacing layer can be guaranteed through the surfacing mode that each grid is filled at a time.

Description

Technical Field

[0001] The invention relates to the technical field of grate plates, in particular to a single-tooth crusher grate plate and a surfacing method thereof. Background Art

[0002] The existing single-tooth crusher grate plates in sintering plants are severely worn in high temperature and high impact environments, resulting in short service life and frequent replacement, which affects production efficiency. Some grate plates are made of integral castings, while others are welded on the surface with a hard surface layer with a thickness of less than 20 mm. Traditional cladding methods are prone to stress concentration at high temperatures, resulting in large pieces of cladding layer peeling off and rapid failure. The thickness of the hard surface layer is limited and it is easily worn away. Frequent replacement of grate plates and cladding maintenance increases production costs.

[0003] The Chinese patent with the patent number CN215140405U discloses an improved crusher grate plate, wherein the bottom of the step-shaped groove arranged on both sides above the grate plate body is provided with a bottom frame surfacing layer, a partition is arranged on the top of the bottom frame surfacing layer, a top frame surfacing layer is arranged on the top of the partition, and a surfacing outer layer is covered on the top frame surfacing layer and on both sides above the grate plate body. This method divides the surfacing layer in the vertical direction into an upper and lower layer, and the high chromium carbide cemented carbide is divided into an upper and lower layer. Combined with the CN215140405U patent Figure 3 The top right-angled side has only a thin top frame, and the right-angled corners have poor impact resistance.

[0004] The Chinese patent with patent number CN201410095702.2 discloses a grate plate for a crusher, which is provided with vertical ribs. Figure 3 The vertical ribs separate the wear-resistant alloy into left and right side structures, the top corners are made of wear-resistant and high-temperature alloy layers, and the right-angle corners have poor impact resistance.

[0005] In actual use, the wear of the above corners is quite serious, such as Figure 1 shown.

[0006] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a single-tooth crusher grate plate and a surfacing method thereof. Summary of the invention

[0007] The main technical problem solved by the present invention is to provide a single-tooth crusher grate plate and a surfacing method thereof, which can effectively reduce the probability of large pieces of hard surface peeling off and extend the service life of the grate plate. The surfacing method of filling each square at one time can ensure the strength of the interlayer bonding and the overall performance of the surfacing layer.

[0008] To solve the above technical problems, a technical solution adopted by the present invention is: to provide a single-tooth crusher grate plate, which includes a grate plate body, a lattice structure and a wear-resistant hard surface weld layer. A mounting groove is reserved in the wear area on the top of the grate plate body, and a lattice structure is welded and installed in the mounting groove. The lattice structure includes a support plate, a spacer plate and an inclined plate. The two support plates are obliquely symmetrically distributed, and the two support plates are fixedly connected by a plurality of spacers. The cross-section of the two support plates is an inverted trapezoid. A plurality of inclined plates serving as rib supports are installed on the outside of the support plate to improve the impact resistance of the corners and facilitate surfacing. The spacer plates and the inclined plates separate the middle and outer sides of the lattice structure into independent squares. A wear-resistant hard surface weld layer is welded in the square, and the wear-resistant hard surface weld layer is higher than the square. The wear-resistant hard surface weld layer is filled with a hard surface flux-cored welding wire with high carbon, high chromium and high refractory alloy content to provide high hardness and good impact resistance.

[0009] Preferably, the grate plate body is welded from low-carbon steel plate Q235 or Q355 as a base material, and a cooling water channel is reserved in the middle of the grate plate body.

[0010] Preferably, the support plates, spacer plates and inclined plates are made of 8-15 mm thick chromium-molybdenum low alloy steel plates to ensure sufficient strength at high temperatures, and are gridded into squares with a single side size of 70-130 mm and a depth of 50-100 mm.

[0011] Preferably, the alloy composition of the hard facing flux cored welding wire includes at least C4-6%, Cr15-25%, Mo+Nb+V+W+Ti10-20%, so as to ensure sufficient carbide precipitation and maintain wear resistance at high temperature.

[0012] Preferably, the inclined plates and the spacer plates are aligned or staggered.

[0013] A surfacing method for a single-tooth crusher grate plate comprises the following steps: S1. Installation of grid structure: Weld the grid structure at the installation groove reserved by grinding on the top of the grate plate body. The grid structure separates the installation groove into independent grids. S2. Preheating: Preheat the grate plate body and the grid structure at 350°C to eliminate hardness and reduce cracks. S3. Overlay welding: Use hard-surface flux-cored welding wire to swing and fill the squares in turn. The flux-cored welding wire melts and fills the squares evenly. Each square needs to be filled with overlay welding at one time. The welding temperature is higher than 350℃ to ensure good fusion of the weld and reduce stress concentration. After welding, keep warm and cool slowly to form a wear-resistant hard surface welding layer.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The use of special hard-faced flux-cored welding wire significantly improves the hardness and wear resistance of the grate plate, and improves the wear resistance; The one-time full-filling surfacing method and proper interlayer temperature control effectively improve the impact resistance of the grate plate, reduce the generation of cracks, and enhance the impact resistance; The setting of the grid structure can effectively reduce the probability of large pieces of hard surface peeling of the wear-resistant welding layer. The grid structure and the low-alloy steel plate used in the grid structure can allow the hard surface welding material to be welded to more than 50mm. Otherwise, although the welding material has good wear resistance and temperature resistance, it is too hard and brittle to weld too thick, and the service life is short. The grid structure prolongs the service life of the grate plate and reduces the maintenance and replacement costs; The cladding process is simple and easy, suitable for large-scale production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the wear condition of the edges and corners of the grate plate used in the existing crusher.

[0016] Figure 2 The figure is a schematic diagram of the structure of a single-tooth crusher grate plate.

[0017] Figure 3 A cross-sectional view of a single-tooth crusher grate plate.

[0018] Figure 4 It is a schematic diagram of the grid structure of a single-tooth crusher grate plate.

[0019] Figure 5 Another schematic diagram of the lattice structure of a single-tooth crusher grate plate.

[0020] Figure 6 Schematic diagram of the wear condition of the corners of the square structure of a single-tooth crusher grate plate.

[0021] Among them, 1. grate plate body, 2. lattice structure, 21. support plate, 22. spacer plate, 23. inclined plate, 3. wear-resistant hard surface welding layer. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0023] See also Figures 1 to 6 , the embodiment of the present invention includes: A single-tooth crusher grate plate, the single-tooth crusher grate plate comprises a grate plate body 1, a lattice structure 2 and a wear-resistant hard surface welding layer 3, the grate plate body 1 has a reserved installation groove in the wear area at the top, the lattice structure 2 is welded and installed in the installation groove, the lattice structure 2 comprises a support plate 21, a spacer plate 22 and an inclined plate 23, the two support plates 21 are obliquely symmetrically distributed, the two support plates 21 are fixedly connected by a plurality of spacers 22, the cross section of the two support plates 21 is an inverted trapezoid, and the outer side of the support plate 21 is provided with a plurality of rib support plates. The supporting inclined plate 23 improves the impact resistance of the corners and facilitates surfacing welding. The spacer plate 22 and the inclined plate 23 separate the middle and outer sides of the grid structure 2 into independent grids. The grids are surfacingly welded with a wear-resistant hard surface welding layer 3. The wear-resistant hard surface welding layer 3 is higher than the grids. The wear-resistant hard surface welding layer 3 is filled with a hard surface flux-cored welding wire with high carbon, high chromium and high refractory alloy content to provide high hardness and good impact resistance. The setting of the grid structure 2 can effectively reduce the probability of large-scale peeling of the hard surface of the wear-resistant hard surface welding layer 3, thereby extending the service life of the grate plate.

[0024] The grate plate body 1 is welded with low carbon steel plate Q235 or Q355 as a base material, and a cooling water channel is reserved in the middle of the grate plate body 1.

[0025] The support plate 21, the spacer plate 22 and the inclined plate 23 are made of 8-15 mm thick chromium-molybdenum low alloy steel plates to ensure sufficient strength at high temperatures, and are gridded into squares with a single side size of 70-130 mm and a depth of 50-100 mm.

[0026] The alloy composition of the hard facing flux cored welding wire includes at least C4-6%, Cr 5-25%, and Mo+Nb+V+W+Ti10-20% to ensure sufficient carbide precipitation and maintain wear resistance at high temperatures.

[0027] The inclined plates 23 and the spacer plates 22 are aligned or staggered.

[0028] A surfacing method for a single-tooth crusher grate plate, characterized in that it comprises the following steps: S1. Installation of the grid structure: The grid structure is welded at the installation groove reserved by grinding on the top of the grate plate body 1. The grid structure 2 separates the installation groove into independent grids; S2, preheating: preheating the grate plate body 1 and the grid structure 2 at 350°C to eliminate hardness and reduce cracks; S3. Overlay welding: Use hard-surface flux-cored welding wire to swing and fill the squares in turn. The flux-cored welding wire melts and fills the squares evenly. Each square needs to be filled with overlay welding at one time. Do not fill it halfway and then interrupt cooling before overlay welding. In this way, the hard-surface overlay layer in the square can ensure integrity, reduce residual welding stress and internal crack defects, improve impact resistance and avoid peeling off. The welding temperature is higher than 350℃ to ensure good fusion of the weld bead and reduce stress concentration. After welding, keep warm and cool slowly to form a wear-resistant hard-surface welding layer 3. The overlay welding method of filling each square at one time can ensure the strength of the interlayer bonding and the overall performance of the overlay layer.

[0029] The invention discloses a single-tooth crusher grate plate and a surfacing method thereof, which effectively reduce the probability of large pieces of hard surface peeling off and extend the service life of the grate plate. The surfacing method of filling each square at one time can ensure the strength of the interlayer bonding and the overall performance of the surfacing layer.

[0030] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A single-tooth crusher grate plate, characterized in that: The invention comprises a grate plate body (1), a grid structure (2) and a wear-resistant hard-surface welding layer (3). A mounting groove is reserved in the wear area at the top of the grate plate body (1), and the grid structure (2) is welded and installed in the mounting groove. The grid structure (2) comprises a support plate (21), a spacer plate (22) and an inclined plate (23). The two support plates (21) are obliquely symmetrically distributed. The two support plates (21) are fixedly connected by a plurality of spacers (22). The two support plates (21) form a cross-section of an inverted trapezoid. A plurality of inclined plates (23) serving as rib support are installed on the outer side of the support plate (21). The spacer plates (22) and the inclined plates (23) separate the middle and outer sides of the grid structure (2) into independent grids. A wear-resistant hard-surface welding layer (3) is welded in the grid. The wear-resistant hard-surface welding layer (3) is higher than the grid. The wear-resistant hard-surface welding layer (3) is filled with a hard-surface flux-cored welding wire with a high carbon, high chromium and high refractory alloy content.

2. A single-tooth crusher grate plate according to claim 1, characterized in that: The grate plate body (1) is welded from a low-carbon steel plate Q235 or Q355 as a base material, and a cooling water channel is reserved in the middle of the grate plate body (1).

3. A single-tooth crusher grate plate according to claim 1, characterized in that: The support plate (21), the spacer plate (22) and the inclined plate (23) are made of 8-15 mm thick chromium-molybdenum low alloy steel plates, which are gridded into squares with a single side size of 70-130 mm and a depth of 50-100 mm.

4. A single-tooth crusher grate plate according to claim 1, characterized in that: The alloy composition of the hard-face flux-cored welding wire at least includes C4-6%, Cr15-25%, and Mo+Nb+V+W+Ti10-20%.

5. A single-tooth crusher grate plate according to claim 1, characterized in that: The inclined plates (23) and the spacer plates (22) are aligned or staggered.

6. A surfacing method for a single-tooth crusher grate plate according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Installation of the grid structure: welding the grid structure (2) to the installation groove reserved by the top mill of the grate plate body (1), and the grid structure (2) divides the installation groove into independent grids; S2, preheating: preheating the grate plate body (1) and the grid structure (2) at 350°C to eliminate hardness and reduce crack generation; S3. Overlay welding: Use hard-surface flux-cored welding wire to oscillate and fill the squares in turn. The flux-cored welding wire melts and fills the squares evenly. Each square needs to be filled with overlay welding at one time. The welding temperature is higher than 350℃ to ensure good fusion of the weld and reduce stress concentration. After welding, keep warm and cool slowly to form a wear-resistant hard surface welding layer (3).

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