Novel rock bucket tooth for excavator

Abstract

The rock bucket tooth is of an up-down and left-right symmetrical structure, the rock bucket tooth comprises a tooth plate and a tooth holder which are integrally formed, the tooth holder is arranged at the rear end of the tooth plate, and rib plates connected with the tooth holder are arranged on the upper end face and the lower end face of the tooth plate. A connecting groove is formed in the end face, away from the toothed plate, of the tooth holder, pin holes are formed in the two side walls of the connecting groove of the tooth holder, and side reinforcing bosses are arranged at the positions, where the pin holes are formed, of the outer wall of the tooth holder. The rock bucket tooth disclosed by the utility model is good in wear resistance, high in hardness and good in toughness, so that the bucket tooth of the excavator can work for a long time in a mine rock environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely is a new rock bucket tooth for excavator. BACKGROUND

[0002] Generally, the excavator is equipped with backhoe, and the force direction of the excavator to the bucket is downward, which forces the soil to be cut; however, in the mine working condition, the backhoe excavator is used more, and the force direction is the excavator advancing, and then the bucket is upward, which lifts the excavator and performs loading work, and the stress on the bucket tooth is larger. In view of the large stress on the bucket of the large backhoe excavator, the shear force and the wear resistance of the backhoe tooth need to be fully considered in the design, especially in the working object of high-hardness rock with f=8~10 and medium-hardness rock with f=4~6, the shear force often causes the backhoe tooth of the excavator to be broken, excessively worn, frequently replaced, and a large amount of cost is generated. A new rock bucket tooth with good strong resistance, good wear resistance, high hardness, good toughness and long service life in the mine rock environment is needed. SUMMARY

[0003] In view of the above defects in the prior art, the utility model aims at providing a new rock bucket tooth for excavator.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A new rock bucket tooth for excavator, the rock bucket tooth is a symmetrical structure up and down and left and right, the rock bucket tooth includes integrally formed tooth plate and tooth seat, the tooth seat is arranged at the rear end of the tooth plate, the upper and lower end faces of the tooth plate are provided with rib plates connected with the tooth seat, the end face of the tooth seat away from the tooth plate is provided with a connecting groove, the tooth seat is provided with pin holes on the two side walls of the connecting groove, and the outer wall of the tooth seat is provided with side reinforcing bosses at the positions of the pin holes; one end of the tooth plate away from the tooth seat is provided with a tooth tip, the tooth tip includes a tooth tip top face and a tooth tip side inclined face, the tooth tip side inclined face connects the tooth tip top face and the plate face of the tooth plate, and the rib plate extends to the tooth seat from the edge of the plate face and the tooth tip side inclined face; the tooth tip top face includes a waist plane and a top plane, and the waist plane connects the top plane and the plate side face of the tooth plate; the tooth tip side inclined face includes a tooth tip top inclined face and a tooth tip side inclined face; the tooth tip top inclined face connects the top plane and the front transition face of the rib plate; the tooth tip side inclined face connects the waist plane and the plate face, and the tooth tip side inclined face connects the tooth tip top inclined face and the plate side face; the tooth tip side inclined face is quadrilateral, and the upper edge and the lower edge of the tooth tip side inclined face are parallel.

[0006] Further, the vertical center lines of the tooth tip top inclined face, the top plane and the front transition face are located on the left-right symmetry plane, and the horizontal center lines of the waist plane, the top plane and the plate side face are located on the up-down symmetry plane.

[0007] Furthermore, the connecting groove is frustoconical in shape.

[0008] Furthermore, the tooth tip inclined surface is a trapezoidal surface, the width of the top plane is the same as the bottom edge of the tooth tip inclined surface, the width of the end of the front transition surface near the tooth tip inclined surface is the same as the top edge of the tooth tip inclined surface, and the waist length of the tooth tip inclined surface is greater than the length of the end of the tooth tip side inclined surface near the tooth tip inclined surface.

[0009] Furthermore, the outer wall of the tooth holder is a square pyramidal base, and the upper or lower conical surface of the tooth holder is connected to the plate surface through a first arc-shaped transition surface, and the upper or lower conical surface of the tooth holder is connected to the front transition surface through a second arc-shaped transition surface.

[0010] Furthermore, the second arc-shaped transition surface is a trumpet shape that spreads from the front transition surface to the gear seat, and the starting point of the second arc-shaped transition surface is located on the plate surface.

[0011] Furthermore, the side surface of the plate is coplanar with the left or right conical surface of the tooth seat.

[0012] Furthermore, an annular reinforcing ring is provided on the outer wall of the tooth seat at the port of the connecting groove, and the annular reinforcing ring is connected to the side reinforcing boss; the platform of the side reinforcing boss is quadrangular, and the diagonal of the front corner of the side reinforcing boss is located on the upper and lower symmetrical planes.

[0013] Furthermore, the edges of the rock teeth are transitioned by outer or inner rounded corners.

[0014] Furthermore, the length of the rock teeth is 180-230mm;

[0015] Projected length of distance from top plane to rear end of front transition surface: Projected length of distance from front end to rear end of second arc transition surface: Tooth seat length = 2-3: 1-2: 1-2;

[0016] Projected length of distance from top plane to rear end of plate: Projected length of distance from front end to rear end of first arc transition: Tooth seat length = 4-6: 1.5-3: 2-4;

[0017] The projected length of the distance between the bottom edge and the top edge of the tooth tip bevel is 25-30mm;

[0018] Connecting groove depth: gear seat length = 1.1-1.2:1;

[0019] Distance between pin hole center and rear end of gear seat: Gear seat length = 1 - 1.2 : 3;

[0020] Distance between the front corner of the side-reinforced boss and the center of the pin hole: Gear seat length = 1 - 1.2: 2;

[0021] The width of the front side of the toothed plate is 60-80mm;

[0022] Width of the top edge of the tooth tip bevel: Width of the bottom edge of the tooth tip bevel: Width of the front end of the tooth plate side surface = 1.5-2: 2.5-3.5: 6-8;

[0023] The thickness of the side reinforcement boss in the pin hole is 5-7mm;

[0024] The width of the rear end of the gear seat is 90-110mm;

[0025] The thickness between the top edges of the upper and lower tooth tip bevels is 25-35mm;

[0026] The thickness of the rear end of the gear seat is 90-110mm;

[0027] Thickness between the top edges of the upper and lower tooth tip inclined surfaces: Tooth tip top surface thickness: Distance between the top edge of the tooth tip inclined surface and the plate surface = 15:3-5:1-1.2;

[0028] The thickness of the rear end of the gear seat is 90-110mm;

[0029] The angle between the bevels of the upper and lower tooth tips is 40-45°.

[0030] The angle between the upper and lower front transition surfaces is 5-7°;

[0031] The angle between the upper and lower panels is 3-5°;

[0032] The angle between the upper and lower conical surfaces of the gear seat is 30-35°;

[0033] The front corner angle of the side reinforcement boss is 60-70°;

[0034] The angles on both sides of the front transition surface are 1-3°;

[0035] The angle between the upper or lower edge of the beveled surface of the tooth tip is 50-60°.

[0036] The angle between the sides of the left and right panels is 4-6°;

[0037] The angle of the reinforced bosses on the left and right sides is 10-15°.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] This invention improves the hardness and toughness of the bucket teeth by addressing both structural shape and material aspects, significantly extending their service life, reducing the frequency of replacement, and effectively lowering the operating costs of excavators. The rock bucket teeth of this invention have good wear resistance, high hardness, and good toughness, enabling excavators to operate for extended periods in rocky mining environments. Attached Figure Description

[0040] Figure 1is a front view of the novel rock bucket tooth for excavator of the utility model;

[0041] Figure 2 is a plan view of the novel rock bucket tooth for excavator of the utility model;

[0042] Figure 3 is a perspective structural schematic view of the novel rock bucket tooth for excavator of the utility model;

[0043] Figure 4 is a front view dimension drawing of the novel rock bucket tooth for excavator of the utility model;

[0044] Figure 5 is a plan view dimension drawing of the novel rock bucket tooth for excavator of the utility model.

[0045] In the drawing: 1, tooth plate; 11, tooth tip top surface; 12, tooth tip top inclined surface; 13, tooth tip side inclined surface; 14, plate side surface; 15, plate surface; 16, first arc-shaped transition surface; 2, tooth seat; 21, pin hole; 22, side reinforcing boss; 23, annular reinforcing ring; 24, connecting groove; 3, rib plate; 31, front transition surface; 32, second arc-shaped transition surface.

[0046] L1, length of rock bucket tooth; L2, projection length of distance from top plane to rear end of front transition surface; L3, projection length of distance from front end to rear end of second arc-shaped transition surface; L4, length of tooth seat; L5, projection length of distance from top plane to rear end of plate surface; L6, projection length of distance from front end to rear end of first arc-shaped transition surface; L8, projection length of distance between bottom edge and top edge of tooth tip top inclined surface; L9, depth of connecting groove; L10, distance between center of pin hole and rear end of tooth seat; L11, distance between front corner of side reinforcing boss and center of pin hole;

[0047] D1, front end width of plate side surface of tooth plate; D2, bottom edge width of tooth tip top inclined surface; D3, top edge width of tooth tip top inclined surface; D4, thickened width of side reinforcing boss at pin hole; D5, rear end width of tooth seat;

[0048] H1, thickness between top edges of upper and lower tooth tip top inclined surfaces; H2, thickness of tooth tip top surface; H3, distance between tooth tip top inclined surface top edge and plate surface;

[0049] A1, angle between upper and lower tooth tip top inclined surfaces; A2, angle between upper and lower front transition surfaces; A3, angle between upper and lower plate surfaces; A4, angle of upper and lower tapered surfaces of tooth seat; A5, angle of front corner of side reinforcing boss;

[0050] B1, angle of two side edges of front transition surface; B2, angle between upper or lower edges of tooth tip side inclined surface; B3, angle between left and right plate side surfaces; B4, angle between left and right side reinforcing boss surfaces. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of the utility model.

[0052] Embodiment 1

[0053] Please refer to Figures 1 to 3 The utility model provides a new rock bucket tooth for excavator, rock bucket tooth is up and down left and right symmetry structure, rock bucket tooth includes integrative tooth plate 1, tooth seat 2, tooth seat 2 sets up at tooth plate 1 rear end, the upper and lower end surfaces of tooth plate 1 all are provided with the rib plate 3 connected with tooth seat 2, the end face of tooth seat 2 away from tooth plate 1 is provided with connecting groove 24, tooth seat 2 is provided with pin hole 21 on the both sides wall of connecting groove 24, tooth seat 2 outer wall is provided with side reinforcing boss 22 at the place of setting pin hole 21.

[0054] Specifically, the connecting groove 24 is a frustum-shaped groove.

[0055] Further, the tooth plate 1 away from the tooth seat 2 one end sets up tooth tip, the tooth tip includes tooth tip top surface 11, tooth tip side slope, the tooth tip side slope connects tooth tip top surface 11 with the board surface 15 of tooth plate 1, the rib plate 3 extends to tooth seat 2 from the edge of board surface 15 and tooth tip side slope.

[0056] Specifically, the tooth tip top surface 1 includes waist plane, top plane, the waist plane connects the top plane with the board side surface 14 of tooth plate 1.

[0057] Specifically, the tooth tip side slope includes tooth tip top slope 12, tooth tip side slope 13, the tooth tip top slope 12 connects the top plane with the front transition surface 31 of rib plate 3, the tooth tip side slope 13 connects the waist plane with the board surface 15, the tooth tip side slope 13 connects the tooth tip top slope 12 with the board side surface 14.

[0058] Specifically, the vertical center line of the tooth tip top slope 12, the top plane and the front transition surface 31 is on the left-right symmetry plane, the horizontal center line of the waist plane, the top plane and the board side surface 14 is on the up-down symmetry plane.

[0059] Specifically, the tooth tip side slope 13 is quadrilateral, the upper edge of the tooth tip side slope 13 is parallel to the lower edge.

[0060] Furthermore, the tooth tip inclined surface 12 is a trapezoidal surface, the width of the top plane is the same as the bottom edge of the tooth tip inclined surface 12, the width of the front transition surface 31 near the tooth tip inclined surface 12 is the same as the top edge of the tooth tip inclined surface 12, and the waist length of the tooth tip inclined surface 12 is greater than the length of the tooth tip side inclined surface 13 near the tooth tip inclined surface 12.

[0061] Furthermore, the outer wall of the tooth base 2 is a square pyramid base, and the upper or lower conical surface of the tooth base 2 is connected to the plate surface 15 through the first arc-shaped transition surface 16, and the upper or lower conical surface of the tooth base 2 is connected to the front transition surface 31 through the second arc-shaped transition surface 32.

[0062] Specifically, the second arc-shaped transition surface 32 is a trumpet shape that spreads from the front transition surface 31 toward the tooth seat 2, and the starting point of the second arc-shaped transition surface 32 is located on the plate surface 15.

[0063] Specifically, the side surface 14 of the plate is coplanar with the left or right conical surface of the tooth seat 2.

[0064] Furthermore, an annular reinforcing ring 23 is provided on the outer wall of the tooth seat 2 at the port of the connecting groove 24, and the annular reinforcing ring 23 is connected to the side reinforcing boss 22.

[0065] Specifically, the surface of the side reinforcing boss 22 is quadrangular, and the diagonal of the front corner of the side reinforcing boss 22 is located on the upper and lower symmetrical planes.

[0066] Specifically, the edges of the rock teeth are transitioned by outer or inner rounded corners to avoid stress concentration.

[0067] In this embodiment, the rock bucket tooth has a tooth tip top surface 11 and a tooth tip side slope, which reduces the initial contact area with the rock during operation, so that the pressure applied at the moment the rock bucket tooth contacts the rock is maximized, which is beneficial to the initial damage to the rock. As the tooth tip breaks the rock, large pieces of rock may break the rock bucket tooth. The rib plate 3 can improve the bending strength of the rock bucket tooth. When the rock bucket tooth tip exerts upward force to further increase the amount of rock breaking, it will have a greater destructive effect on the pin hole 21 of the assembly pin shaft. By increasing the thickness of the side reinforcement boss, the shear strength at this point is improved.

[0068] Example 2:

[0069] Based on Example 1, combined with Figure 4 , Figure 5 This embodiment provides a new size range for rock bucket teeth used in excavators.

[0070] The length L1 of the rock bucket teeth is 180-230mm, preferably 210mm.

[0071] The projection length L2 of the top plane to the rear end of the front transition surface: the projection length L3 of the front end to the rear end of the second arc-shaped transition surface: the length L4 of the tooth seat = 2-3: 1-2: 1-2, preferably 23: 13: 16.

[0072] The projection length L5 of the top plane to the rear end of the plate surface: the projection length L6 of the front end to the rear end of the first arc-shaped transition surface: the length L4 of the tooth seat = 4-6: 1.5-3: 2-4, preferably 49: 23: 32.

[0073] The projection length L8 of the bottom edge to the top edge of the top bevel of the tooth tip is 25-30 mm, preferably 26 mm.

[0074] The depth L9 of the connecting groove: the length L4 of the tooth seat = 1.1-1.2: 1, preferably 19: 16.

[0075] The distance L10 of the center of the pin hole to the rear end of the tooth seat: the length L4 of the tooth seat = 1-1.2: 3, preferably 5: 16.

[0076] The distance L11 of the front corner of the side reinforcing boss to the center of the pin hole: the length L4 of the tooth seat = 1-1.2: 2, preferably 15: 32.

[0077] The front end width D1 of the plate side surface of the tooth plate is 60-80 mm, preferably 70 mm.

[0078] The top edge width D3 of the top bevel of the tooth tip: the bottom edge width D2 of the top bevel of the tooth tip: the front end width D1 of the plate side surface of the tooth plate = 1.5-2: 2.5-3.5: 6-8, preferably 2: 3: 7.

[0079] The thickening width D4 of the side reinforcing boss at the pin hole is 5-7 mm, preferably 6 mm.

[0080] The rear end width D5 of the tooth seat is 90-110 mm, preferably 100 mm.

[0081] The thickness H1 between the top edges of the upper and lower tooth tip top bevels is 25-35 mm, preferably 30 mm.

[0082] The thickness H1 between the top edges of the upper and lower tooth tip top bevels: the tooth tip thickness H2: the distance H3 between the top edge of the tooth tip top bevel and the plate surface = 15: 3-5: 1-1.2, preferably 15: 4: 1.

[0083] The rear end thickness H4 of the tooth seat is 90-110 mm, preferably 90 mm.

[0084] The angle A1 between the upper and lower tooth tip top bevels is 40-45°, preferably 44°.

[0085] The angle A2 between the upper and lower front transition surfaces is 5-7°, preferably 6°.

[0086] The angle A3 between the upper and lower plates is 3-5°, preferably 4°.

[0087] The angle A4 between the upper and lower conical surfaces of the tooth seat is 30-35°, preferably 32°.

[0088] The angle A5 of the front edge of the side reinforcement boss is 60-70°, preferably 63°.

[0089] The angle B1 on both sides of the front transition surface is 1-3°, preferably 2°.

[0090] The angle B2 between the upper or lower edge of the tooth tip bevel is 50-60°, preferably 57°.

[0091] The angle B3 between the sides of the left and right plates is 4-6°, preferably 5°.

[0092] The angle B4 of the reinforced bosses on the left and right sides is 10-15°, preferably 14°.

[0093] Practice has proven that the above-mentioned preferred solution can be smoothly inserted into the rock fissures of the mining environment, with high efficiency and good dimensions to resist rock conditions when working in the mining environment; the thickness of the tooth tip increases rapidly from 8mm to 30mm within a length of 26mm; the width increases from 30mm to 70mm within a distance of 34mm, realizing a rapid increase in cross-sectional area and effectively increasing shear strength.

[0094] The rock bucket teeth are made of 35CrMnBH material, which has high strength, good toughness, and good hot working performance. Combined with the above-mentioned optimized scheme, it well meets the working environment of high hardness rock in the mine with f=8~10.

[0095] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0096] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0097] In the description of the utility model, it is understood that the terms "upper", "lower", "left", "right", "front", "rear" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, and the utility model can have various changes and changes for those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A new type of rock bucket tooth for excavator, the rock bucket tooth is symmetrical structure up and down and left and right, the rock bucket tooth comprises an integrally formed tooth plate and a tooth seat, the tooth seat is arranged at the rear end of the tooth plate, characterized in that, The toothed plate is provided with ribs connected to the toothed seat on both the upper and lower end faces. The toothed seat is provided with a connecting groove on the end face away from the toothed plate. The toothed seat is provided with pin holes on both side walls of the connecting groove. The toothed seat is provided with a side reinforcing boss at the pin hole location on the outer wall of the toothed seat. The toothed plate has a tooth tip at one end away from the tooth base. The tooth tip includes a tooth tip top surface and a tooth tip side inclined surface. The tooth tip side inclined surface transitions the tooth tip top surface to the plate surface of the toothed plate. The rib extends from the edge of the plate surface and the tooth tip side inclined surface to the tooth base. The tooth tip top surface includes a waist plane and a top plane, and the waist plane transitions and connects the top plane to the side surface of the tooth plate; The tooth tip side slope includes a tooth tip slope and a tooth tip side slope; The tooth tip bevel connects the top plane to the front transition surface of the rib plate. The tooth tip side slope connects the waist plane to the plate surface, and the tooth tip side slope connects the tooth tip top slope to the plate side surface; the tooth tip side slope is quadrilateral, and the upper and lower sides of the tooth tip side slope are parallel.

2. A new type of rock bucket tooth for excavator according to claim 1, characterized in that, The vertical center lines of the tooth tip inclined surface, top plane, and front transition surface are located on the left-right symmetrical plane, and the horizontal center lines of the waist plane, top plane, and plate side surface are located on the upper-lower symmetrical plane.

3. A new type of rock bucket tooth for excavator according to claim 2, characterized in that, The connecting groove is truncated cone-shaped.

4. A new type of rock bucket tooth for excavator according to claim 3, characterized in that, The tooth tip slope is a trapezoidal surface. The width of the top plane is the same as the bottom edge of the tooth tip slope. The width of the end of the front transition surface near the tooth tip slope is the same as the top edge of the tooth tip slope. The waist length of the tooth tip slope is greater than the length of the end of the tooth tip side slope near the tooth tip slope.

5. A new type of rock bucket tooth for excavator according to claim 4, characterized in that, The outer wall of the tooth holder is a square pyramidal base. The upper or lower conical surface of the tooth holder is connected to the plate surface through a first arc-shaped transition surface, and the upper or lower conical surface of the tooth holder is connected to the front transition surface through a second arc-shaped transition surface.

6. A new type of rock bucket tooth for excavator according to claim 5, characterized in that, The second arc-shaped transition surface is a trumpet shape that spreads from the front transition surface to the gear seat, and the starting point of the second arc-shaped transition surface is located on the plate surface.

7. A new type of rock bucket tooth for excavator as claimed in claim 5, wherein, The side surface of the plate is coplanar with the left or right conical surface of the tooth seat.

8. A new type of rock bucket tooth for excavator according to claim 7, characterized in that, The outer wall of the toothed seat is provided with an annular reinforcing ring at the port of the connecting groove. The annular reinforcing ring is connected to the side reinforcing boss. The surface of the side reinforcing boss is quadrangular, and the diagonal of the front corner of the side reinforcing boss is located on the upper and lower symmetrical planes.

9. A new type of rock bucket tooth for excavator according to claim 8, characterized in that, The edges of the rock teeth are transitioned by outer or inner rounded corners.

10. A new type of rock bucket tooth for excavator as claimed in claim 8, wherein, The length of the rock bucket teeth is 180-230mm; Projected length of distance from top plane to rear end of front transition surface: Projected length of distance from front end to rear end of second arc transition surface: Tooth seat length = 2-3: 1-2: 1-2; Projected length of distance from top plane to rear end of plate: Projected length of distance from front end to rear end of first arc transition face: Tooth seat length = 4-6: 1.5-3: 2-4; The projected length of the distance between the bottom edge and the top edge of the tooth tip inclined surface is 25-30mm; Connecting groove depth: gear seat length = 1.1-1.2:1; Distance between pin hole center and rear end of gear seat: Gear seat length = 1 - 1.2 : 3; Distance between the front corner of the side-reinforced boss and the center of the pin hole: Gear seat length = 1 - 1.2: 2; The width of the front side of the toothed plate is 60-80mm; Width of the top edge of the tooth tip bevel: Width of the bottom edge of the tooth tip bevel: Width of the front end of the tooth plate side surface = 1.5-2: 2.5-3.5: 6-8; The thickening width of the side reinforcing boss at the pin hole is 5-7mm; The rear end width of the tooth seat is 90-110mm; The thickness between the top edges of the upper and lower tooth tip top bevels is 25-35mm; The thickness between the upper and lower tooth tip top bevels: the tooth tip top surface thickness: the distance between the tooth tip top bevel top edge and the plate surface = 15: 3-5: 1-1.2; The angle between the upper and lower tooth tip top bevels is 40-45°; The angle between the upper and lower front transition surfaces is 5-7°; The angle between the upper and lower plate surfaces is 3-5°; The angle of the upper and lower conical surfaces of the tooth seat is 30-35°; The angle of the front edge of the side reinforcing boss is 60-70°; The angle of the two side edges of the front transition surface is 1-3°; The angle between the upper and lower edges of the tooth tip side bevel is 50-60°; The angle between the left and right plate side surfaces is 4-6°; The angle between the left and right side reinforcing boss surfaces is 10-15°.

Images