CN210946951U

CN210946951U - Milling wheel assembly and double-wheel slot milling machine

Info

Publication number: CN210946951U
Application number: CN201920956280.1U
Authority: CN
Inventors: 韩凤; 韩冰冰; 黄建华
Original assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Current assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-07-07
Anticipated expiration: 2029-06-25

Abstract

The present disclosure relates to a cutterhead assembly comprising a cutterhead frame and a cutterhead rotatably mounted to the cutterhead frame, characterized in that the cutterhead comprises a hub and a first cutting unit; wherein the first cutting unit includes: the cutting pick is used for milling and crushing hard materials; the swing teeth are arranged on the periphery of the hub in a swinging mode, and the swinging axis is parallel to the axial direction of the milling wheel; and the cutting teeth are arranged on the downstream of the oscillating tooth and the upstream of the cutting tooth along the rotation direction of the milling wheel. According to the milling wheel assembly and the double-wheel slot milling machine provided by the embodiment of the disclosure, the milling capacity under various stratum environments is realized, the wheel pasting probability of the milling wheel on a soft ground is reduced, and the milling wheel has a longer service life when milling a hard ground.

Description

Milling wheel assembly and double-wheel slot milling machine

Technical Field

The disclosure relates to the field of engineering machinery, in particular to a milling wheel assembly and a double-wheel slot milling machine.

Background

The underground continuous wall is a new technology which is rapidly developed on the basis of foundation construction engineering and underground concealed engineering, has the characteristics of large structural rigidity, strong integrity, high seepage-proofing performance, long durability, small influence on surrounding foundations, little influence on the environment of adjacent structures, wide application range of a bottom layer and the like due to integral casting of the wall body, and is widely applied to engineering projects such as urban rail transit, water conservancy reservoirs, port construction, municipal engineering, bridges, high-rise buildings and the like. The double-wheel slot milling machine is special equipment for processing the underground diaphragm wall, and the required slot forming is formed by cutting a broken rock stratum through the milling wheel and then discharging slag through reverse circulation.

On the basis, the milling wheel is used as a core structure in the double-wheel slot milling machine, so that the construction efficiency of the double-wheel slot milling machine is influenced, and the arrangement mode and the type of milling teeth on the milling wheel also directly influence the stratum adaptation range of the milling wheel. For example: for medium-weathering and slightly-weathering hard rocks, rolling and breaking the rocks by using roller hobbing generally; point impact crushing is generally carried out on a sand layer, a pebble layer, weathered rock and a hard rock stratum by adopting cutting tooth type milling teeth; for soil layers, small pebble layers, sand layers, weathered rock layers and partial hard rocks, standard tooth milling teeth are generally adopted for cutting and breaking the rocks.

However, when the double-wheel slot milling machine is used for longitudinal slot milling, few single stratums appear, and the double-wheel slot milling machine generally needs to penetrate through various stratums, so that different types of milling wheels or double-wheel milling main machines with different types of milling wheels need to be replaced according to stratum changes frequently during construction, and safety of a milling process is guaranteed. However, the frequently replaced milling wheel or the double-wheel milling main machine undoubtedly increases the time for replacing the milling wheel and moving the main machine, thereby indirectly increasing the construction cost.

In addition, the cutting tooth milling wheel for the existing double-wheel milling generally adopts a spiral arrangement mode, and teeth are distributed in a full cutting mode in the axial direction of the milling wheel. The arrangement mode aims to ensure the rock breaking capacity of the milling wheel in a hard rock stratum, but when the milling wheel encounters a viscoplastic stratum, the clay wheel pasting phenomenon is obvious due to the tooth arrangement mode that the milling wheel does not have blind areas in the axial direction, and the whole construction efficiency is influenced due to the need of regular cleaning. The standard gear milling wheel suitable for the soft stratum has the advantages that the milling speed is low when the hard stratum is milled, the phenomena of tooth breakage and tooth release are easy to occur, and the service life of the milling wheel is influenced. Therefore, how to improve the milling efficiency and the service life of the milling teeth and reduce the clay wheel pasting probability is still a difficult problem in the industry.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiments of the present disclosure provide a milling wheel assembly and a dual-wheel slot milling machine, which have milling capabilities in various stratum environments, and can reduce wheel pasting probability of the milling wheel, and make the milling wheel have a longer service life when milling a hard ground.

In one aspect of the present disclosure, there is provided a cutterhead assembly, including a cutterhead frame and a cutterhead rotatably mounted to the cutterhead frame, the cutterhead including a hub and a first cutting unit;

wherein the first cutting unit includes:

the cutting pick is used for milling and crushing hard materials;

the swing teeth are arranged on the periphery of the hub in a swinging mode, and the swinging axis is perpendicular to the axial direction of the milling wheel; and

and the cutting teeth are arranged on the downstream of the oscillating tooth and the upstream of the cutting tooth along the rotation direction of the milling wheel.

In some embodiments, the cutterhead further includes at least one second cutting unit including a pick, and the first and second cutting units are arranged in layers on the outer circumference of the hub in the axial direction of the cutterhead.

In some embodiments, the cutterhead assembly further includes:

the cleaning device can clean materials adhered between the adjacent first cutting unit and the second cutting unit and/or between the adjacent second cutting units.

In some embodiments, the cleaning device comprises:

the suction port is fixedly arranged on the milling wheel frame, is positioned on one side of the milling wheel and is used for discharging materials milled by the milling wheel; and

and the scraping plate is fixedly arranged on the milling wheel frame, is arranged at the downstream of the suction port in the rotation direction of the milling wheel, is positioned between the adjacent first cutting unit and the adjacent second cutting unit and/or between the adjacent second cutting units in the axial direction of the milling wheel, can remove the materials adhered to the milling wheel, and guides the removed materials to the suction port for discharging.

In some embodiments, the material scraping plate is in clearance fit with the periphery of the hub close to the end face of the hub;

the scraping plate is close to the end face of the hub and is also provided with a scraping blade, the scraping blade is located in the upstream of the scraping plate along the rotating direction of the milling wheel, and the scraping blade and the clearance of the periphery of the hub are smaller than those of the scraping plate and the periphery of the hub.

In some embodiments, the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the adjacent second cutting units and/or the middle points of the outer edges of the adjacent second cutting units along the axial direction of the milling wheel is 90-180 mm.

In some embodiments, the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the adjacent second cutting units and/or the middle points of the outer edges of the adjacent second cutting units along the axial direction of the milling wheel is 120-130 mm or 160-170 mm.

In some embodiments, the first cutting unit and/or the second cutting unit further comprises:

the toothed plate is of a circular ring sheet structure, is fixedly arranged on the periphery of the hub, is parallel to the axis of the milling wheel in the thickness direction, and is provided with at least two radial grooves;

the number of the cutting picks is at least two, the at least two cutting picks are installed in the at least two radial grooves through the tooth holder, and the at least two cutting picks are arranged at intervals along the circumferential direction of the milling wheel.

In some embodiments, the cutting teeth are at least partially exposed at the circumferential end surface of the tooth plate in a radial direction of the cutterhead.

In some embodiments, the cutting tooth comprises:

the wear-resisting plate is fixedly arranged on the toothed plate; and

cutting edge, detachably install in the antifriction plate, the cutting edge is followed the radial extension of cutterhead, and follow the direction of rotation of cutterhead, the cutting edge is close to cutterhead periphery one end is located keeps away from the upper reaches of cutterhead periphery one end.

In some embodiments, in the axial direction of the cutterhead, the radially extending plane of the cutting edge is spaced from the tooth plate, and the radially extending direction of the cutting edge is located outside the tooth plate.

In some embodiments, the cutting tooth further comprises:

chisels, which are detachably mounted to the wear plate in a form of being mounted separately or in combination with the cutting edges, the number of the chisels being at least two, the at least two chisels being arranged in a radial direction of the cutterhead, and the chisel of the at least two chisels which is closer to the outer periphery of the cutterhead being located upstream of the chisel which is farther from the outer periphery of the cutterhead in a rotation direction of the cutterhead.

In some embodiments, the at least two cutting picks mounted on the same tooth plate rotate around the axis of the milling wheel, when the two cutting picks rotate to a point where the tooth tip passes through a first point, projections of the at least two cutting pick point points are located on the same circular arc envelope line, the circular arc envelope line is on a cross section perpendicular to the circumferential direction of the milling wheel, and a projection line of the projection of the tooth tip point is a tangent line perpendicular to the axial direction of the milling wheel and passing through the first point.

In some embodiments, the circular arc envelope is located outside the wobble tooth and/or the cutting edge in a radial direction of the cutterhead.

In some embodiments, projections of the at least two cusp points of the cutting tooth passed by the same circular arc envelope are distributed in an axisymmetric manner.

In some embodiments, the obtuse angle included between tangents to the arc envelope lines of the tips of the picks located at both ends of the at least two picks passing through the same arc envelope line is 130 ° to 150 °.

In some embodiments, the number of the at least two cutting picks passing through the same circular arc envelope line is even, and the acute angle between the tip and the root connecting line of each cutting pick in the middle is 5-10 degrees.

In another aspect of the disclosure, there is provided a two-wheel slot milling machine including a cutterhead assembly as set forth in any one of the preceding claims.

Therefore, the milling wheel assembly and the double-wheel slot milling machine provided by the embodiment of the disclosure have milling capabilities in various stratum environments, the wheel pasting probability of the milling wheel on a soft ground can be reduced, and the milling wheel has a long service life when used for milling a hard ground.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a front view of a mill wheel assembly according to some embodiments of the present disclosure;

FIG. 2 is a side view schematic illustration of a mill wheel assembly according to some embodiments of the present disclosure;

FIG. 3 is a perspective view of a cutterhead assembly according to some embodiments of the present disclosure;

fig. 4 is a perspective view of a first cutting unit according to some embodiments of the present disclosure;

fig. 5 is a schematic diagram of a pick rotation trajectory and corresponding arc envelope according to some embodiments of the present disclosure.

In the figure:

1. milling a wheel frame;

2. the milling cutter wheel 21, the wheel hub 22, the first cutting unit 23, the second cutting unit 24, the cutting teeth 25, the swing teeth 251, the swing tooth rotating shaft 26, the cutting teeth 261, the wear-resisting plate 262, the cutting edges 27, the toothed plates 271 and the radial tooth grooves;

3. the cleaning device 31, the suction port 32, the scraping plate 33 and the mud scraping blade;

4. an arc envelope.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

As shown in FIGS. 1 to 5:

wherein the first cutting unit includes:

the cutting pick is used for milling and crushing hard materials;

For the milling wheel component needing to mill hard materials, particularly hard land materials, the adoption of the cutting tooth type milling teeth can bring about strong rock breaking capacity, and the milling wheel component has good applicability to sand beds, pebble beds and hard rock strata. The related milling wheel or double-wheel slot milling machine also applies the cutting tooth type milling wheel aiming at the milling working environment of the hard land materials, and the milling wheel has better milling effect and longer service life by continuously improving the arrangement mode of cutting teeth.

And the swing teeth are arranged on the periphery of the hub in a swinging mode and used for ensuring that a milling blind area caused by the installation relation between the milling wheel frame and the milling wheel is milled. With reference to fig. 2 in particular, in order to ensure that the cutterhead is rotatable, the cutterhead frame needs to be installed at least on one side of the cutterhead, so that along the milling direction, a corresponding crushing mechanism is necessarily arranged in front of the cutterhead frame without milling capability, so as to ensure that the cutterhead assembly can be milled smoothly. Based on the above, the swing tooth can swing through the swing tooth, when the swing tooth rotates to the front of the milling wheel frame along the milling direction, the swing tooth swings to one side of the milling wheel frame, so as to cover the milling area corresponding to the milling wheel frame; and when the swing tooth rotates to the installation area of the milling wheel and the milling wheel frame, the swing tooth swings to one side far away from the milling wheel frame so as to pass through a narrower installation area.

In order to ensure that the swing teeth can swing along a set direction, as shown in fig. 4, the swing tooth rotating shaft is arranged in a manner of being tangent to the outer peripheral surface of the hub and being perpendicular to the axial direction of the milling wheel. In order to ensure the cutting effect, structural strength and reliability of the wobble tooth, the wobble-tooth spindle usually has a large length and cross-sectional area, so that the milling wheel must reserve enough installation space downstream of the wobble tooth in the rotation direction of the milling wheel, which may adversely affect the first cutting unit, especially the cutting tooth downstream of the wobble tooth.

Specifically, both the oscillating tooth and the cutting tooth are mainly subjected to radial load during the milling process of the milling wheel assembly, and therefore the installation form of the oscillating tooth and the cutting tooth is also set to meet the radial load of the corresponding milling tooth. The gap caused by the installation space of the oscillating tooth rotating shaft can exert a circumferential load on the first cutting unit, particularly cutting teeth at the downstream of the oscillating tooth, and the structural strength of the first cutting unit is adversely affected.

On this basis, the first cutting unit solves the adverse effect of the mounting space downstream of the wobble tooth by the cutting tooth's ability to break up earth material at this mounting space by providing the cutting tooth downstream of the wobble tooth and upstream of the cutting pick in the direction of rotation of the cutterhead.

Further, in order to ensure the cutting effect of the milling wheel, in some embodiments, the milling wheel further comprises at least one second cutting unit, the second cutting unit comprises a cutting pick, and the first cutting unit and the second cutting unit are arranged in a layer type on the outer periphery of the hub along the axial direction of the milling wheel.

As shown in fig. 2 to 3, the number of the second cutting unit is at least one, and the second cutting unit is different from the first cutting unit, and the second cutting unit does not need to be provided with a swing tooth corresponding to the milling wheel frame, so that the second cutting unit can be mainly composed of cutting teeth to enhance the overall milling capability of the milling wheel.

Related milling wheels or double-wheel slot milling machines also apply the milling work of the cutting tooth type milling wheels arranged in a full cutting mode aiming at hard land materials so as to ensure that a milling main curve formed by cutting teeth is fully covered along the axial direction of the milling wheels without blind areas, so that the cutting tooth type milling teeth are uniform in stress, small in abrasion and high in milling efficiency. In the present application, the first cutting unit and the second cutting unit are arranged in a layered manner on the outer periphery of the hub, so that the pendulum teeth can be accommodated in a gap between the first cutting unit and the second cutting unit arranged in a layered manner, and the pendulum teeth have a larger degree of freedom.

In another aspect, the layered arrangement of the inter-layer gaps of the first and second cutting units further enables the mill wheel assembly of the present application to further comprise:

As shown in fig. 2, when there is at least one second cutting unit, the interlayer gaps between the first cutting unit and the second cutting unit arranged in a layered manner are divided into two types: an interlayer gap between the adjacent first cutting unit and the second cutting unit, and an interlayer gap between the adjacent second cutting units. Based on this, the cleaning device can only clean one type of interlayer gap, and also can only clean the two types of interlayer gaps.

Because the adhesion phenomenon of the milling wheel is mostly generated in the milling environment of soft strata, if the cutting-tooth-type milling wheel arranged in a full-cutting mode is used, when the milling wheel longitudinally mills the soft strata with viscoplasticity, the adhesion phenomenon (wheel pasting phenomenon) of the land materials is easy to occur. This application is through setting up reasonable interlaminar clearance on the pick type cutterhead that is applicable to harder stratum, guaranteeing when the cutterhead mills the ability to hard stratum, through interlaminar clearance sets up cleaning device to it is right to get rid of the adhesion of land material in time the cutterhead mills the influence of ability, makes the cutterhead that this application provided can be applied to stereoplasm and soft stratum with reasonable milling efficiency, improved the adaptability under the multiple complex stratum environment of cutterhead in actual construction environment avoids constantly changing and the construction steps of clearance cutterhead to the efficiency of whole milling construction has been improved and the life of milling the tooth has been prolonged.

Specifically, as shown in fig. 1, in some embodiments, the cleaning device comprises:

The suction outlet can be provided with a suction outlet which is separately aimed at the cleaning device and is configured with a corresponding suction pump and a suction pipeline; of course, the suction outlet may also be a suction outlet provided in the cutter wheel assembly itself, for example, a sand suction outlet provided in a double-wheel slot milling machine, through which the cleaned ground material adhering to the inter-floor space together with the milled mud and rock slag is discharged out of the milling area.

Further, in order to prolong the service life of the scraping plate, in some embodiments, the end surface of the scraping plate close to the hub is in clearance fit with the periphery of the hub;

The scraping blade can be detachably mounted on the scraping plate close to the end face of the hub and close to the periphery of the hub, so that milling materials adhered to the milling wheel can be better removed from the periphery of the hub. Under the protection of scraping the mud sword, scrape the flitch only need right scrape the mud sword and provide supporting role, and need not direct and mill the material contact to improve the life of self, avoided frequently changing the influence to machining efficiency.

Further, in order to ensure the cutting capability of the first cutting unit and the second cutting unit which are arranged in a layered manner on the cutterhead as much as possible, in some embodiments, the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the adjacent second cutting units and/or between the middle points of the outer edges of the adjacent second cutting units along the axial direction of the cutterhead is 90-180 mm.

The distance range specifically refers to a distance between the outer edge midpoints of the first cutting unit and the second cutting unit and/or a distance between opposite surfaces of the outer edge midpoints of the adjacent second cutting units, and at the distance, the milling wheel assembly can not only ensure that milling materials adhered between layers can be removed by the cleaning device, but also ensure that the milling capacity of the milling wheel is continuously kept within a reasonable range.

Further, on the basis of the distance range of 90-180 mm, in some embodiments, the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the second cutting units and/or between the middle points of the outer edges of the adjacent second cutting units in the axial direction of the milling wheel is 120-130 mm or 160-170 mm.

The definition of the above-mentioned distance range specifically includes: the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the adjacent second cutting units is 120-130 mm, or the distance between the middle points of the outer edges of the adjacent first cutting units and the middle points of the outer edges of the adjacent second cutting units is 160-170 mm; and/or the distance between the middle points of the outer edges of the adjacent second cutting units is 120-130 mm, or the distance between the middle points of the outer edges of the adjacent second cutting units is 160-170 mm.

Further, as shown in fig. 2-3, in some embodiments, the first cutting unit and/or the second cutting unit further comprises:

By the fixed arrangement of the tooth plate relative to the outer periphery of the hub, the first and/or second cutting units may form a layered arrangement. And through seting up in the pinion rack the radial recess, the pick with be connected between the pinion rack can be more firm, and through setting up the angle of seting up of radial recess, on the same pinion rack can also have different angles between at least two picks, thereby realize better cutting effect.

Further, in order to provide good protection for the cutting teeth to the downstream tooth plate and the picks mounted thereon, in some embodiments, the cutting teeth are at least partially exposed at a circumferential end surface of the tooth plate in a radial direction of the cutterhead.

The cutting teeth at least partially exposed out of the circumferential end face of the toothed plate can cover the toothed plate at the downstream of the cutting teeth and the cutting teeth arranged on the toothed plate under cutting shadows of the cutting teeth, so that loads borne by the toothed plate and the cutting teeth along the circumferential direction of the milling wheel are reduced, the abrasion of the toothed plate and the cutting teeth is reduced, and the service life of the milling wheel is prolonged.

Further, as shown in FIG. 4, to facilitate maintenance and replacement of the cutting tooth, in some embodiments, the cutting tooth comprises:

the wear-resisting plate is fixedly arranged on the toothed plate; and

Through install in the antifriction plate of pinion rack, the cutting edge is installed with the detachable mode, makes things convenient for the change of wearing and tearing part in the maintenance process to the cutting tooth. And one end of the cutting edge, which is close to the periphery of the milling wheel, is positioned at the upstream of one end, which is far away from the periphery of the milling wheel, so that the materials crushed by the cutting edge can be discharged out of the cutting range of the cutting edge along the inclination angle of the cutting edge relative to the radial direction of the milling wheel, and the adverse effect of material accumulation on the cutting edge is avoided.

Further, in order to improve the protective effect of the cutting edge on the tooth plate and the cutting pick, in some embodiments, in the axial direction of the milling wheel, a radial extension plane of the cutting edge has a distance from the tooth plate, and a radial extension direction of the cutting edge is located outside the tooth plate.

Further, in order to improve the hard rock breaking capability of the cutting edge, in some embodiments, the cutting tooth further comprises:

In order to further protect the toothed plate and the radial grooves formed in the toothed plate and improve the capability of the milling wheel in crushing hard rock formations, as shown in fig. 5, in some embodiments, the at least two cutting teeth mounted on the same toothed plate rotate around the axis of the milling wheel, when the two cutting teeth rotate to the point of the.

Because the projections of the tooth profiles of the at least two cutting teeth are positioned on the same circular arc envelope line, the at least two cutting teeth are arranged in a sector shape, so that the tooth tips of the cutting teeth can well protect the toothed plate and the tooth body of the cutting teeth, and the abrasion of the toothed plate and the tooth body is reduced. And the arc envelope line formed by the tooth profile (or the tooth tip) of the cutting tooth can effectively improve the rock breaking capacity of the milling wheel, so that the efficiency of the milling wheel is higher in the milling environment of hard rock stratum.

Further, in some embodiments, the arc envelope is located outside the wobble tooth and/or the cutting tooth in the radial direction of the cutterhead, so that the cutting tooth profile (or the tooth tip) of the cutting pick also provides good protection for the wobble tooth and the cutting tooth.

Further, as shown in fig. 5, in some embodiments, projections of the at least two cusps of the cutting teeth passing by the same circular arc envelope are axisymmetrically distributed. For the example of fig. 5, the same circular arc envelope passes through 8 picks, and the position of the symmetry axis is shown by the dashed line, i.e. the symmetry axis extends in the radial direction of the cutterhead and is located between the projection of the fourth pick and the projection of the fifth pick.

The projection of the two cutting tooth sharp points which are in axial symmetric distribution can enable the circumferential stress of the toothed plate to be more uniform in axial distribution, so that the toothed plate is prevented from being bent and falling due to uneven stress, and the durability of the toothed plate and the overall reliability of the milling wheel assembly are improved.

Further, in order to improve the milling effect of the cutting picks, in some embodiments, the included obtuse angle between tangents of the tips of the cutting picks at two ends of the at least two cutting picks passing through the same circular arc envelope line on the circular arc envelope line is 130-150 degrees.

In some embodiments, the number of the at least two cutting picks passing through the same circular arc envelope line is even, and the acute angle formed by the connecting line of the tooth tip and the tooth root of each of the two cutting picks located at the middle position is 5-10 degrees.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A cutterhead assembly comprising a cutterhead frame and a cutterhead rotatably mounted to the cutterhead frame, wherein the cutterhead includes a hub and a first cutting unit;

wherein the first cutting unit includes:

the cutting pick is used for milling and crushing hard materials;

2. The cutterhead assembly of claim 1, further including at least a second cutting unit including a pick, and wherein the first and second cutting units are arranged in layers about the periphery of the hub in the axial direction of the cutterhead.

3. The cutterhead assembly of claim 2, further comprising:

4. The cutterhead assembly of claim 3, wherein the cleaning device includes:

5. The cutterhead assembly of claim 4, wherein the end surface of the scraper adjacent the hub is a clearance fit with the periphery of the hub;

6. The cutterhead assembly according to claim 2, wherein the spacing between adjacent first and second cutting unit outer edge midpoints and/or adjacent second cutting unit outer edge midpoints in the axial direction of the cutterhead is 90-180 mm.

7. The cutterhead assembly of claim 6, wherein the spacing between adjacent first and second cutting unit outer edge midpoints and/or adjacent second cutting unit outer edge midpoints in the axial direction of the cutterhead is 120-130 mm or 160-170 mm.

8. The cutterhead assembly of claim 2, wherein the first cutting unit and/or the second cutting unit further comprises:

9. The cutterhead assembly of claim 8, wherein the cutting teeth are at least partially exposed at the circumferential end surface of the tooth plate in a radial direction of the cutterhead.

10. The cutterhead assembly of claim 8, wherein the cutting teeth include:

the wear-resisting plate is fixedly arranged on the toothed plate; and

11. The cutterhead assembly as set forth in claim 10 wherein, in the axial direction of the cutterhead, the radially extending plane of the cutting edge is spaced from the tooth plate and the direction of radial extension of the cutting edge is outboard of the tooth plate.

12. The cutterhead assembly of claim 10, wherein the cutting teeth further include:

13. The cutterhead assembly of claim 8, wherein the at least two cutting picks mounted on the same toothed plate rotate about the axis of the cutterhead, when the two cutting picks rotate to a point where the point passes through a first point, the projections of the points of the at least two cutting picks are located on the same circular arc envelope line, the circular arc envelope line is on a cross section perpendicular to the circumference of the cutterhead, and the projection line of the projection of the point is a tangent line perpendicular to the axial direction of the cutterhead and passing through the first point.

14. The cutterhead assembly as claimed in claim 13, wherein the circular arc envelope is located outboard of the pendulum teeth and/or cutting teeth in the radial direction of the cutterhead.

15. The cutterhead assembly according to claim 13, wherein the projections of the at least two cutting tooth cusps through which the same circular arc envelope passes are axisymmetric.

16. The cutterhead assembly according to claim 15, wherein the obtuse angle included between tangents to the arc envelope lines of the points of the tips of the at least two cutting picks at both ends, through which the same arc envelope line passes, is 130 ° to 150 °.

17. The cutterhead assembly according to claim 15, wherein the at least two cutting picks pass by the same circular arc envelope in an even number and the acute angle subtended by the connecting line between the tip and root of each of the two cutting picks in the intermediate position is between 5 ° and 10 °.

18. A two-wheel slot milling machine comprising a cutterhead assembly as claimed in any one of claims 1 to 17.