CN109763833A - A roadheader and its central hob axial locking device - Google Patents

Abstract

The invention discloses an axial locking device for a central hob, which comprises a first pressing block for being fixedly connected with the central hob, and further comprises a first pressing block for pressing the first pressing block to realize the axial direction of the central hob. Press the center hob and the second pressing block for the center hob to be pressed against the center tool seat on which the center hob is installed. The invention also discloses a roadheader comprising the above-mentioned central hob axial locking device. The above-mentioned central hob axial locking device can improve the stability and reliability of the installation of the central hob by locking the central hob in the axial direction, thereby reducing abnormal wear and damage of the central hob, and improving the use of the central hob. life.

Description

A roadheader and its central hob axial locking device

technical field

The invention relates to the technical field of tool assembly, in particular to an axial locking device for a central hob. The invention also relates to a roadheader with the axial locking device of the central hob.

Background technique

TBMs are special construction machinery for tunnels, and have been widely used in subway, municipal, railway, highway and other tunnel projects. The center hob is installed in the center of the cutter head of the hard rock tunnel boring machine, and is the main tool for breaking the rock formation in the center area of the face.

In hard rock formations, the center hob has a large load, large vibration, and a harsh working environment. If the installation stability is poor, it is prone to wear or loosening during the excavation process, which affects the service life of the center hob. The center hob in the prior art is limited by the geometric space of the center position of the cutter head, and can only be fixed on the center cutter seat by the rolling direction locking device, and there is a stopper limit in the axial direction, so that the cutter seat and the hob are connected. There is a gap in the axial direction, which is prone to axial movement during the excavation process, causing the center hob to loosen, which in turn causes abnormal wear and damage to the center hob and even the center tool seat, reducing the service life of the center hob and the tool seat, and increasing the equipment. cost.

Therefore, how to avoid affecting the service life of the central hob and the tool seat due to the axial serial movement of the central hob is a technical problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an axial locking device for the central hob, which can solve the problem of affecting the service life of the central hob and the tool seat due to the axial serial movement of the central hob. The device axially locks the central hob, thereby improving the stability and reliability of the installation of the central hob, thereby reducing abnormal wear and damage of the central hob, and improving the service life of the central hob. Another object of the present invention is to provide a roadheader including the above-mentioned central hob axial locking device.

In order to achieve the above purpose, the present invention provides an axial locking device for a central hob, which includes a first pressing block used to be fixedly connected with the central hob, and also includes a first pressing block for pressing the first pressing The center hob is axially pressed and the second pressing block for the center hob to be pressed against the center tool seat on which the center hob is installed.

Preferably, it also includes a third pressing block that is matched and connected with the second pressing block and is used to contact and cooperate with the central tool seat.

Preferably, a plurality of pre-tightening bolts arranged along the radial direction of the central hob and used to connect the second pressing block and the third pressing block are also included.

Preferably, both the second pressing block and the third pressing block are provided with threaded holes for cooperating with the pre-tightening bolts.

Preferably, the first pressing block includes a first connecting bar used for cooperating with the end face of the central hob close to the third pressing block, and a first connecting bar perpendicular to the first connecting bar and used for connecting with the central hob The side of the second connecting strip that fits.

Preferably, the second connecting bar is provided with a first inclined surface located at the top for setting at a preset angle; the second pressing block is provided with a side close to the first pressing block for connecting with the first pressing block. The first inclined surface is in close contact with the second inclined surface.

Preferably, it also includes a top block for contacting and cooperating with the second pressing block to limit the second pressing block along the axial direction of the central hob.

Preferably, the top block is fixed to the cutter head by several screws.

Preferably, the second pressing block is a right-angled trapezoidal pressing block.

The present invention also provides a roadheader, comprising the central hob axial locking device described in any one of the above.

Compared with the above-mentioned background technology, the present invention designs an axial locking device for the central hob according to the different requirements for the installation of the central hob on the roadheader. The frictional force is used to limit the axial movement of the hob. This frictional resistance is seriously small compared to the side load of the central hob for rock breaking, and the axial restraint force on the central hob is poor, and the central hob cannot be completely locked in the axial direction. , the installation stability of the central hob is poor, so it is necessary to use an axial locking device that can improve the stability and reliability of the installation of the central hob, thereby improving the service life of the central hob and the tool seat.

Specifically, the above-mentioned central hob axial locking device includes a first pressing block and a second pressing block, wherein the first pressing block is used for fixed connection with the central hob, and the second pressing block is used for pressing Press the first pressing block, so that the central hob can be pressed along the axial direction of the central hob and the central hob can be pressed on the central tool seat on which the central hob is installed; that is, the second pressing block Under the action of the first pressing block, the pressing force along the axial direction of the central hob and the pressing force in the radial direction of the central hob can be generated, wherein the pressing force along the axial direction of the central hob can press the axial direction of the central hob. When tightening the center hob, the pressing force along the radial direction of the center hob can further press the center hob on the center tool seat. This setting method can realize the axial locking of the central hob and strengthen the fastening effect between the central hob and the central tool seat, thereby effectively improving the stability and reliability of the installation of the central hob, reducing abnormal wear and damage of the central hob, Improve the service life of the central hob and reduce the cost of the central hob, thereby reducing the construction cost and improving the driving efficiency. At the same time, the device is easy to install and disassemble, simple to operate, and can be reused on other center tool holders, which can reduce labor input and maintenance time, and improve the efficiency of equipment use.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a front view of a central hob axial locking device for locking a central hob disclosed in an embodiment of the present invention;

Fig. 2 is the sectional structure schematic diagram of A-A in Fig. 1;

FIG. 3 is a schematic cross-sectional structure diagram of B-B in FIG. 2 .

in:

1-Top block, 2-First compression block, 3-Second compression block, 4-Third compression block, 5-Screw, 6-Pre-tightening bolt, 7-Nut, 8-Fixing bolt, 9- Center hob, 10-center tool seat, 11- tool seat wedge, 12- tool disc.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The core of the present invention is to provide an axial locking device for the central hob, which can solve the problem of affecting the service life of the central hob and the tool seat due to the axial serial movement of the central hob. The device axially locks the central hob, thereby improving the stability and reliability of the installation of the central hob, thereby reducing abnormal wear and damage of the central hob, and improving the service life of the central hob. Another core of the present invention is to provide a roadheader including the above-mentioned central hob axial locking device.

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

It should be noted that the directional terms such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the description.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 . FIG. 1 is a front view of a center hob axial locking device disclosed in an embodiment of the present invention for locking the center hob; FIG. 2 is a schematic cross-sectional structure diagram of A-A in FIG. 1 3 is a schematic diagram of the cross-sectional structure of B-B in FIG. 2 .

The central hob axial locking device provided by the embodiment of the present invention includes a first pressing block 2 and a second pressing block 3, wherein the central hob 9 is installed on the hard rock tunnel boring machine through the central tool seat 10. At the center position of the cutter head 12, the central hob 9 is fixedly connected to the central cutter base 10; the first pressing block 2 is fixedly connected to the central hob 9, and the second pressing block 3 is used to squeeze the first pressing block 2 On the one hand, the central hob 9 can be pressed along the axial direction of the central hob 9; on the other hand, under the force of the second pressing block 3, the first pressing block 2 can make the central hob 9 further It is pressed radially on the center tool seat 10 on which the center hob 9 is installed.

That is to say, under the action of the second pressing block 3, the first pressing block 2 can generate a pressing force along the axial direction of the central hob 9 and a pressing force along the radial direction of the central hob 9, wherein, along the The axial pressing force of the central hob 9 can press the central hob 9 in the axial direction, and the pressing force in the radial direction of the central hob 9 can further press the central hob 9 on the central tool seat 10 .

In this way, the axial locking device of the central hob can realize the axial locking of the central hob 9 and strengthen the fastening effect of the central hob 9 and the central tool seat 10 , thereby effectively improving the installation stability of the central hob 9 Improve the performance and reliability, reduce abnormal wear and damage of the central hob 9, increase the service life of the central hob 9, reduce the cost of use of the central hob 9, thereby reducing the construction cost and improving the tunneling efficiency of the roadheader. At the same time, the device is easy to install and disassemble, simple to operate, and can be reused on other center tool holders 10, which can reduce labor input and maintenance time, and improve equipment use efficiency.

In the embodiment of the present invention, the axial locking device of the central hob further includes a third pressing block 4, the third pressing block 4 is matched and connected with the second pressing block 3, and the third pressing block 4 is used for connecting with the center The tool seat 10 is in contact and fit, and the third pressing block 4 is in contact and fit with the end surface of the center tool seat 10 away from the center hob 9 .

Specifically, the above-mentioned device also includes a number of preload bolts 6, all of which are arranged along the radial direction of the central hob 9, and the function of the preload bolts 6 is to connect the second pressing block 3 and the third pressing block 4 , and further force the second pressing block 3 to move in a direction close to the third pressing block 4 through the pre-tightening force of the pre-tightening bolt 6 .

That is to say, the second pressing block 3 and the third pressing block 4 are connected by a plurality of pre-tightening bolts 6, and correspondingly, the second pressing block 3 and the third pressing block 4 are both provided with threaded holes, The holes are used for connection with the pre-tightening bolts 6; it should be noted that the threaded holes on the second pressing block 3 and the threaded holes on the third pressing block 4 are in a one-to-one correspondence, and the The threaded holes are coaxially arranged with the threaded holes of the third pressing block 4 , and the number of the respective threaded holes is the same as the number of the pre-tightening bolts 6 .

Of course, according to actual needs, the above-mentioned pre-tightening bolts 6 should be set as high-strength bolts. The high-strength bolts penetrate through the threaded holes on the second compression block 3 and pass through the threaded holes in the third compression block 4 and extend out. The ends are fastened with nuts 7; in addition, the number of preload bolts 6 can also be adjusted according to the axial locking requirements of the central hob 9, for example, a first preload bolt and a second preload bolt can be provided, Correspondingly, both the second pressing block 3 and the third pressing block 4 are provided with two corresponding threaded holes, and the axes of the two threaded holes on the second pressing block 3 are respectively The axes of the threaded holes are aligned.

More specifically, the first pressing block 2 includes a first connecting bar and a second connecting bar, wherein the first connecting bar is used to connect with the bottom surface of the central hob 9 , that is, the central hob 9 is close to the third pressing block 4 The end face is matched and connected, that is to say, the first pressing block 2 is connected with the central hob 9 through the first connecting bar; the second connecting bar is perpendicular to the first connecting bar, and the second connecting bar is used for Side fit.

In order to facilitate the connection between the first pressing block 2 and the central hob 9, the first pressing block 2 can be specifically configured as an L-shaped pressing block. In this way, the L-shaped first pressing block includes short-side connecting bars. Connecting bar with long side, wherein the short side connecting bar is the first connecting bar, and the long side connecting bar is the second connecting bar, that is to say, the short side connecting bar of the L-shaped first pressing block and the center hob The bottom surface of 9 is fixedly connected, and the long side connecting strip of the L-shaped first pressing block is fitted with the side surface of the central hob 9 .

In addition, the short-side connecting strip can be fixedly connected to the bottom surface of the central hob 9 through two fixing bolts 8. Of course, the connection between the short-side connecting strip and the central hob 9 can be set in other ways, provided that the above functions can be satisfied , the relevant technical requirements of bolted connection can refer to the relevant technical requirements of the existing part, which will not be expanded here.

In order to optimize the above-mentioned embodiment, the second connecting bar is provided with a first inclined plane at the top, and the first inclined plane is set at a preset angle. Of course, the angle can also be adjusted according to the actual tightening requirements; correspondingly, the second pressing block 3 is provided with a second inclined plane, and the second inclined plane is located at a position of the second pressing block 3 close to the first pressing block 2 side, and the second inclined surface is used to closely fit with the first inclined surface.

Of course, according to actual needs, the second pressing block 3 can be specifically set as a pressing block in the shape of a right-angled trapezoid. In this way, the inclined surface of the pressing block in the shape of a right-angled trapezoid can be set to be compatible with the first pressing block 2. The first slope is completely fitted to the second slope, and when the right-angled trapezoid-shaped pressing block is set, its long side is on the top and the short side is on the bottom, that is to say, the pre-tightening bolt 6 is Thread in on the long side and out on the short side.

On the basis of the above, the axial locking device of the central hob further includes a top block 1 , which is used for contact and cooperation with the second pressing block 3 , so that the axial limit of the central hob 9 can be achieved. The function of the pressing block 3, and the top block 1 is fixed on the cutter head 12 through a number of screws 5. The sides are in contact and fit together, and a preset roughness is set on the side of the top block 1 to give the second pressing block 3 a sufficient position limit.

In this way, the top block 1 and the first pressing block 2 limit the position of the second pressing block 3 in the axial direction of the central hob 9. Under the preloading force of the preloading bolt 6, the second pressing The clamping block 3 can move in the radial direction of the central hob 9 and in the direction close to the third clamping block 4, and further on the second inclined surface of the second clamping block 3 and the first inclined surface of the first clamping block 2 There is a pressing force between them, the component force of the pressing force along the axial direction of the central hob 9 produces a locking constraint on the central hob 9 along its axial direction, and the component force of the pressing force along the radial direction of the central hob 9 is at On the basis of the tightening effect of the tool seat wedge block 11, the center hob 9 is further pressed on the center tool seat 10, wherein the tool seat wedge block 11 is used to strengthen the center hob 9 and the center tool seat 10 The tightening effect of In this way, the purpose of locking the central hob 9 in the axial direction and increasing the installation stability of the central hob 9 and the central tool seat 10 can be achieved.

A roadheader provided by the present invention includes the central hob axial locking device described in the above specific embodiments; other parts of the roadheader can refer to the prior art, which will not be described herein.

It should be noted that, in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or sequence.

The roadheader and the axial locking device of the central hob provided by the present invention are described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A central hob axial locking device, characterized in that it comprises a first pressing block (2) for being fixedly connected with the central hob (9), and also comprises a first pressing block (2) for pressing the first pressing The tightening block (2) realizes the axial pressing of the central hob (9) and the second pressing block (3) for the central hob (9) to be pressed against the central tool seat (10) on which the central hob (9) is installed ). 2. The axial locking device for the central hob according to claim 1, characterized in that it further comprises a contact fitting with the second pressing block (3) for contacting and fitting with the central cutter seat (10). The third pressing block (4). 3. The axial locking device for the central hob according to claim 2, characterized in that it further comprises a plurality of radially arranged central hob (9) for connecting the second pressing block (3). ) and the pre-tightening bolts (6) of the third pressing block (4). 4. The central hob axial locking device according to claim 3, wherein the second pressing block (3) and the third pressing block (4) are both provided with The pre-tightening bolts (6) fit into the threaded holes of the connection. 5. The central hob axial locking device according to claim 4, wherein the first pressing block (2) comprises a third pressing block for being close to the central hob (9) The end face of (4) is fitted with a first connecting bar and a second connecting bar that is perpendicular to the first connecting bar and is used to fit with the side surface of the central hob (9). 6 . The axial locking device for the central hob according to claim 5 , wherein the second connecting strip is provided with a first inclined surface located at the top and is arranged at a preset angle; the second pressure The pressing block (3) is provided with a second inclined surface which is located on the side close to the first pressing block (2) and is used for closely fitting with the first inclined surface. 7. The central hob axial locking device according to any one of claims 1 to 6, characterized in that it further comprises a device for contacting and cooperating with the second pressing block (3) to realize rolling along the center The axial limit of the knife (9) limits the top block (1) of the second pressing block (3). 8 . The axial locking device of the central hob according to claim 7 , wherein the top block ( 1 ) is fixed to the cutter head ( 12 ) through several screws. 9 . 9 . The axial locking device for the central hob according to claim 8 , wherein the second pressing block ( 3 ) is a right-angled trapezoidal pressing block. 10 . 10. A roadheader, characterized in that it comprises the axial locking device of the central hob according to any one of claims 1 to 9.