CN115749824A - Hobbing cutter capable of effectively dispersing radial stress of bearing - Google Patents
Hobbing cutter capable of effectively dispersing radial stress of bearing Download PDFInfo
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- CN115749824A CN115749824A CN202211562142.8A CN202211562142A CN115749824A CN 115749824 A CN115749824 A CN 115749824A CN 202211562142 A CN202211562142 A CN 202211562142A CN 115749824 A CN115749824 A CN 115749824A
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- hob
- bearing
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- roller bearing
- cutter
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Abstract
A hob capable of effectively dispersing radial stress of a bearing comprises a hob shaft, wherein a first bearing and a second bearing are sleeved on the hob shaft, a hob body is sleeved outside the first bearing and the second bearing, a hob ring is sleeved outside the hob body, a partition is arranged between the first bearing and the second bearing, a first hob cover and a second hob cover are respectively arranged at two axial ends of the hob body, the upper portion of the first hob cover is fixedly connected with one side of the hob body, and the upper portion of the second hob cover is fixedly connected with the other side of the hob body; a first sealing ring for sealing the end face of the first bearing and a second sealing ring for sealing the outer surface of one side of the cutter shaft are arranged at the lower end of the first cutter cover in a staggered manner; and a third sealing ring for sealing the end face of the second bearing and a fourth sealing ring for sealing the outer surface of the other side of the cutter shaft are arranged at the lower end of the second cutter cover in a staggered manner. The invention has the advantages that the deformation of each stress part is reduced, the space between the cutter body and the cutter shaft is enlarged, so as to accommodate a bearing roller with larger contact area or accommodate more bearings of different types, and the radial stress of the bearing can be effectively dispersed.
Description
Technical Field
The invention relates to a component of a shield machine, in particular to a hob capable of effectively dispersing radial stress of a bearing.
Background
A plurality of hobbing cutters are arranged on a cutter disc of the shield machine, under the action of huge thrust of the cutter disc, cutter rings of the hobbing cutters are wedged into rocks, the hobbing cutters passively rotate along with the rotation of the cutter disc, and the hobbing cutters rotate around the central shaft of the cutter disc on one hand and rotate around the axis of the hobbing cutters on the other hand; under the action of thrust and torque of the cutter head, the hob cuts a series of concentric grooves on the face of the tunnel to realize continuous rock breaking.
The existing hob structure is shown in fig. 6, including a hob shaft 100, two tapered roller bearings 200 sleeved on the hob shaft 100, a hob body 300 sleeved outside the tapered roller bearings 200, a cutter ring 400 sleeved outside the hob body 300, two gap adjusting rings 500 arranged between the tapered roller bearings 200, a left hob cover 600 and a right hob cover 700 arranged at two axial ends of the hob shaft 100, and floating sealing mechanisms 800 arranged between the left hob cover 600 and the right hob cover 700 and the corresponding tapered roller bearings 200.
The service life of the hob directly influences the construction progress, risk and construction cost of the engineering, and the most important point of the failure mode of the hob in the construction of the tunnel boring machine is that the hob body and the hob shaft of part of the hob can not be uniformly stressed in the working environment, so that the hob body and the hob shaft of the hob can work under the super-strong load easily, and the tapered roller bearing 200 is damaged. As is well known, if the number of rollers between the cutter body and the cutter shaft is increased, the stress of the tapered roller bearing 200 is improved, more bearing rollers are placed or the stress area of the rollers between the cutter body and the cutter shaft is increased, so as to achieve the purpose of prolonging the service life of the bearing.
If with the whole overall dimension grow of hobbing cutter, can enlarge the space that conical roller bearing 200 was placed to the hobbing cutter very easily, because the overall dimension of installation of all shield structure machine hobbing cutters is unified basically, can't be with the whole overall dimension grow of hobbing cutter, also can not shut down all shield structure machines and adapt to and enlarge the cutter body volume with carousel and the whole transformation of blade holder, so under the condition that does not change hobbing cutter overall dimension, how to improve the hobbing cutter atress very important.
How to increase the stressed area of the roller between the cutter body and the cutter shaft and increase the space for placing the tapered roller bearing 200 without changing the overall dimension of the existing hob and to accommodate more bearing rollers so as to effectively disperse the radial stress of the bearing is a problem to be solved by the technical staff in the industry.
Disclosure of Invention
The invention aims to provide a hob which can effectively disperse the radial stress of a bearing by changing the structures of a hob cover and a floating sealing mechanism, enlarging the space between a hob body and a hob shaft, and increasing the number of bearing rollers as much as possible or enabling the space to contain more bearings.
In order to achieve the purpose, the invention adopts the following technical scheme:
the hobbing cutter capable of effectively dispersing radial stress of the bearing comprises a cutter shaft, wherein a first tapered roller bearing and a second tapered roller bearing are sleeved on the cutter shaft, a cutter body is sleeved outside the first tapered roller bearing and the second tapered roller bearing, a cutter ring is sleeved outside the cutter body, a separation piece is arranged between the first tapered roller bearing and the second tapered roller bearing, a first cutter cover and a second cutter cover are respectively arranged at two axial ends of the cutter body, the upper part of the first cutter cover is fixedly connected with one side of the cutter body, and the upper part of the second cutter cover is fixedly connected with the other side of the cutter body; a first sealing ring for sealing the end face of the first tapered roller bearing and a second sealing ring for sealing the outer surface of one side of the cutter shaft are arranged at the lower end of the first cutter cover in a staggered manner; a third sealing ring for sealing the end face of the second tapered roller bearing and a fourth sealing ring for sealing the outer surface of the other side of the cutter shaft are arranged at the lower end of the second cutter cover in a staggered manner; and a first check ring is arranged on the cutter shaft relative to the second seal ring, and a second check ring is arranged on the cutter shaft relative to the fourth seal ring.
As an improvement to the invention, the spacer may be replaced by a roller bearing, forming a multi-bearing structure.
As an improvement of the present invention, a first convex ring is disposed on an upper edge of the first knife cover, a first groove is disposed on a side of the knife body opposite to the first knife cover, and the first convex ring is clamped in the first groove in an interference fit manner.
As an improvement of the present invention, a second convex ring is disposed on the upper edge of the second knife cover, a second groove is disposed on a side of the knife body opposite to the second knife cover, and the second convex ring is clamped in the second groove in an interference fit manner.
As an improvement of the present invention, a first convex ring is disposed on an upper edge of the first knife cover, a first groove is disposed on a side of the knife body opposite to the first knife cover, and the first convex ring is clamped in the first groove in an interference fit manner; the upper edge of the second knife cover is provided with a second convex ring, one side of the knife body, which is opposite to the second knife cover, is provided with a second groove, and the second convex ring is clamped in the second groove in an interference fit manner.
As an improvement of the present invention, the upper portion of the first knife cover is fixedly connected to one side of the knife body by a first fastening member, and the upper portion of the second knife cover is fixedly connected to the other side of the knife body by a second fastening member.
As an improvement of the present invention, the inner rings of the first and second tapered roller bearings are integrated with the corresponding positions of the cutter shaft.
As an improvement of the present invention, inner rings of the first tapered roller bearing, the second tapered roller bearing and the roller bearing are integrated with corresponding positions of the cutter shaft.
As an improvement to the present invention, the outer rings of the first and second tapered roller bearings are integrated with the corresponding positions of the cutter body.
As an improvement to the present invention, the outer races of the first tapered roller bearing, the second tapered roller bearing and the roller bearing are incorporated in corresponding positions of the cutter body.
According to the invention, the upper part of the first knife cover is fixedly connected with one side of the knife body, and the upper part of the second knife cover is fixedly connected with the other side of the knife body; a first sealing ring used for sealing the end face of the first tapered roller bearing and a second sealing ring used for sealing the outer surface of one side of the cutter shaft are arranged at the lower end of the first cutter cover in a staggered manner; the structure that the third sealing ring used for sealing the end face of the second tapered roller bearing and the fourth sealing ring used for sealing the outer surface of the other side of the cutter shaft are arranged at the lower end of the second cutter cover in a staggered mode is adopted, the position of a floating sealing mechanism in the prior art between the cutter cover and the bearing is changed into the position below the cutter cover, and therefore the space for containing the bearing can be effectively enlarged, and the structure has the advantages that the space can contain larger-size bearing rollers, or more different types of bearings can be contained, and the radial stress of the bearing can be relieved.
Drawings
Fig. 1 is a schematic sectional view of a first embodiment of the present invention (three bearings with independent inner and outer races).
Fig. 2 is a schematic sectional view (three bearing inner races incorporated) of a second embodiment of the present invention.
Fig. 3 is a schematic sectional view (three bearing outer races are incorporated) of a third embodiment of the present invention.
Fig. 4 is a schematic sectional view of a fifth embodiment of the present invention (with the inner and outer races of the bearings separated).
FIG. 5 is a schematic cross-sectional view of a duplex hob according to the present invention.
Fig. 6 is a schematic view of a hob structure in the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Referring to fig. 1, fig. 1 discloses a hob capable of effectively dispersing radial stress of a bearing, which includes a hob shaft 1, a first tapered roller bearing 21 and a second tapered roller bearing 22 are sleeved on the hob shaft 1, a spacer 5 is disposed between the first tapered roller bearing 21 and the second tapered roller bearing 22, the spacer 5 is a roller bearing, the spacer 5 shown in fig. 1 is a roller bearing, two roller bearings (the same applies below) having a shorter axial dimension may be provided according to circumstances, a hob body 3 is sleeved outside the first tapered roller bearing 21 and the second tapered roller bearing 22, a hob ring 4 is sleeved outside the hob body 3, the hob body 3 and the hob ring 4 may be made of a hard alloy material to increase rigidity and wear resistance of the hob body 3 and the hob ring 4, a first hob cover 6 and a second hob cover 7 are respectively disposed at two axial ends of the hob body 3, the first hob cover 6 and the second hob cover 7 play a role of dust prevention on one hand, and more importantly play a role of preventing the hob body 3 from being deformed under heavy pressure; the upper portion of the first blade cover 6 is fixedly connected with one side of the blade body 3, in this embodiment, the upper portion of the first blade cover 6 is fixedly connected with one side of the blade body 3 through a first fastening member 64, the upper portion of the second blade cover 7 is fixedly connected with the other side of the blade body 3, and in this embodiment, the upper portion of the second blade cover 7 is fixedly connected with the other side of the blade body 3 through a second fastening member 74; the first fastener 64 and the second fastener 74 in the invention are both screws, and when the screws are screwed tightly, the outer end faces of the screws are flush with the outer surfaces of the corresponding knife covers or lower than the outer surfaces of the knife covers; a first sealing ring 61 for sealing the end face of the first tapered roller bearing 21 and a second sealing ring 62 for sealing the outer surface of one side of the cutter shaft 1 are arranged at the lower end of the first cutter cover 6 in a staggered manner; a third sealing ring 71 for sealing the end face of the second tapered roller bearing 22 and a fourth sealing ring 72 for sealing the outer surface of the other side of the cutter shaft 1 are arranged at the lower end of the second cutter cover 7 in a staggered manner; a first check ring 11 is arranged on the cutter shaft 1 relative to the second seal ring 62, the first check ring 11 is connected with an external thread on the cutter shaft 1 through an internal thread, after the first check ring 11 is screwed, the outer surface of the first check ring 11 and the outer surface of the first cutter cover 6 are in the same plane, or lower than the outer surface of the first cutter cover 6, and the first check ring 11 plays a role in dust prevention; and a second retaining ring 12 is arranged on the cutter shaft 1 relative to the fourth sealing ring 72, the second retaining ring 12 is connected with the external thread on the cutter shaft 1 through an internal thread, after the second retaining ring 12 is screwed, the outer surface of the second retaining ring 12 and the outer surface of the second cutter cover 7 are in the same plane, or are lower than the outer surface of the second cutter cover 7, and the second retaining ring 12 plays a dustproof role. In this embodiment, the cutter body 3, the cutter ring 4, the first cover 6 and the second cover 7 define the maximum outer dimension of the hob body, which is the same as the maximum outer dimension of the hob of the same kind in the prior art.
In this embodiment, the first seal ring 61, the second seal ring 62, the third seal ring 71, and the fourth seal ring 72 may be made of rubber or silica gel.
Preferably, a first convex ring 63 is arranged on the upper edge of the first cutter cover 6, a first groove 31 is arranged on one side of the cutter body 3 opposite to the first cutter cover 6, and the first convex ring 63 is clamped in the first groove 31 in an interference fit manner; the first convex ring 63 is arranged on the upper edge of the first cutter cover 6, the first groove 31 is arranged on the cutter body 3, the first convex ring and the first groove are in interference fit, namely, a reinforcing plate is arranged on one side of the cutter body 3, radial deformation of two ends of the cutter body 3 can be greatly improved, and the service life of the cutter body 3 can be prolonged.
Preferably, a second convex ring 73 is arranged on the upper edge of the second knife cover 7, a second groove 32 is arranged on one side of the knife body 3 opposite to the second knife cover 7, and the second convex ring 73 is clamped in the second groove 32 in an interference fit manner; the second convex ring 73 is arranged on the upper edge of the second knife cover 7, the second groove 32 is arranged on the knife body 3, the second convex ring and the second groove are in interference fit, namely, a reinforcing plate is arranged on the other side of the knife body 3, radial deformation of two ends of the knife body 3 can be greatly improved, and the service life of the knife body 3 can be prolonged.
Referring to fig. 2, the embodiment shown in fig. 2 is substantially the same as the embodiment shown in fig. 1 in terms of its basic structure, except that the inner rings of the first tapered roller bearing 21 and the second tapered roller bearing 22 are integrated with the corresponding positions of the arbor 1; the first tapered roller bearing 21 and the second tapered roller bearing 22 are not provided with inner rings, but the inner rings are achieved by utilizing the local change of the cutter shaft 1, so that the diameter of the stressed part of the cutter shaft 1 can be thickened, the pressure resistance of the cutter shaft 1 can be improved, and the service life of the cutter shaft 1 can be prolonged.
When the spacer 5 is replaced by a roller bearing, the first tapered roller bearing 21, the second tapered roller bearing 22 and the inner ring of the roller bearing can be combined with the corresponding position of the cutter shaft 1 into a whole, so that the diameter of the stressed part of the cutter shaft 1 can be increased, the pressure resistance of the cutter shaft 1 can be improved, and the service life of the cutter shaft 1 can be prolonged.
Referring to fig. 3, the basic structure of the embodiment shown in fig. 3 is substantially the same as that of the embodiment shown in fig. 1, except that the outer rings of the first tapered roller bearing 21 and the second tapered roller bearing 22 are integrated with the corresponding positions of the cutter body 3, and this structure can also improve the service life of the cutter body 3.
Preferably, the first tapered roller bearing 21, the second tapered roller bearing 22 and the outer ring of the roller bearing are integrated with the corresponding position of the cutter body 3, and this structure can also improve the service life of the cutter body 3.
Referring to fig. 4, the basic structure of the embodiment shown in fig. 4 is substantially the same as that of the embodiment shown in fig. 1, except that the spacer 5 is a spacer ring, wherein the size of the first tapered roller bearing 21 and the second tapered roller bearing 22 is nonstandard and larger than standard, so that the first tapered roller bearing 21 and the second tapered roller bearing 22 have larger bearing area, which can effectively disperse the radial pressure of the hob and reduce the radial pressure of the bearings and the arbor.
Of course, the embodiment shown in fig. 4 may also be made into an integrated structure of the bearing inner ring and the cutter shaft, or an integrated structure of the bearing outer ring and the cutter body, which can be described with reference to the structures in fig. 2 and fig. 3, and will not be described again here.
Referring to fig. 5, fig. 5 is a schematic cross-sectional structure view of a duplex hob according to the present invention. The embodiment of figure 5 is substantially identical to the embodiment of figure 3, except that it is a single structure formed by two single rolling cutters connected together by a support block 8.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A hob capable of effectively dispersing radial stress of a bearing comprises a hob shaft (1), wherein a first conical roller bearing (21) and a second conical roller bearing (22) are sleeved on the hob shaft (1), a hob body (3) is sleeved outside the first conical roller bearing (21) and the second conical roller bearing (22), a hob ring (4) is sleeved outside the hob body (3), an isolating piece (5) is arranged between the first conical roller bearing (21) and the second conical roller bearing (22), a first hob cover (6) and a second hob cover (7) are respectively arranged at two axial ends of the hob body (3), and the hob is characterized in that the upper portion of the first hob cover (6) is fixedly connected with one side of the hob body (3), and the upper portion of the second hob cover (7) is fixedly connected with the other side of the hob body (3); a first sealing ring (61) for sealing the end face of the first tapered roller bearing (21) and a second sealing ring (62) for sealing the outer surface of one side of the cutter shaft (1) are arranged at the lower end of the first cutter cover (6) in a staggered manner; a third sealing ring (71) for sealing the end face of the second tapered roller bearing (22) and a fourth sealing ring (72) for sealing the outer surface of the other side of the cutter shaft (1) are arranged at the lower end of the second cutter cover (7) in a staggered manner; the cutter shaft (1) is provided with a first check ring (11) relative to the second seal ring (62), and the cutter shaft (1) is provided with a second check ring (12) relative to the fourth seal ring (72).
2. A roller cutter for efficiently dispersing bearing radial forces according to claim 1, characterized in that the spacers (5) are replaced by roller bearings, forming a multi-bearing structure.
3. The hob capable of effectively dispersing the radial stress of the bearing, according to claim 1 or 2, characterized in that the upper edge of the first hob cover (6) is provided with a first convex ring (63), a first groove (31) is provided on the side of the hob body (3) opposite to the first hob cover (6), and the first convex ring (63) is clamped in the first groove (31) in an interference fit manner.
4. The hob capable of effectively dispersing the radial stress of the bearing according to claim 1 or 2, characterized in that the upper edge of the second cover (7) is provided with a second convex ring (73), a second groove (32) is provided on the side of the hob body (3) opposite to the second cover (7), and the second convex ring (73) is clamped in the second groove (32) in an interference fit manner.
5. The hob capable of effectively dispersing the radial stress of the bearing, according to claim 1 or 2, characterized in that the upper edge of the first hob cover (6) is provided with a first convex ring (63), a first groove (31) is provided on the side of the hob body (3) opposite to the first hob cover (6), and the first convex ring (63) is clamped in the first groove (31) in an interference fit manner; the upper edge of the second knife cover (7) is provided with a second convex ring (73), one side of the knife body (3) opposite to the second knife cover (7) is provided with a second groove (32), and the second convex ring (73) is clamped in the second groove (32) in an interference fit manner.
6. The hob capable of effectively dispersing radial bearing stress according to claim 1 or 2, characterized in that the upper part of the first cover (6) is fixedly connected with one side of the hob body (3) through a first fastening member (64), and the upper part of the second cover (7) is fixedly connected with the other side of the hob body (3) through a second fastening member (74).
7. Hob capable of effectively dispersing the radial bearing forces according to claim 1 or 2, characterized in, that the inner rings of the first tapered roller bearing (21) and the second tapered roller bearing (22) are integrated with the corresponding position of the arbor (1).
8. Hob with an efficient distribution of bearing radial forces according to claim 2, characterized in, that the inner rings of the first tapered roller bearing (21), the second tapered roller bearing (22) and the roller bearings are integrated in the corresponding position of the arbor (1).
9. The hob capable of effectively dispersing bearing radial stress according to claim 1 or 2, characterized in that the outer rings of the first tapered roller bearing (21) and the second tapered roller bearing (22) are integrated with the corresponding positions of the hob body (3).
10. The hob capable of effectively dispersing the radial stress of the bearing, according to the claim 2, characterized in that the outer rings of the first tapered roller bearing (21), the second tapered roller bearing (22) and the roller bearing are integrated with the corresponding positions of the hob body (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211562142.8A CN115749824A (en) | 2022-12-07 | 2022-12-07 | Hobbing cutter capable of effectively dispersing radial stress of bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211562142.8A CN115749824A (en) | 2022-12-07 | 2022-12-07 | Hobbing cutter capable of effectively dispersing radial stress of bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115749824A true CN115749824A (en) | 2023-03-07 |
Family
ID=85343932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211562142.8A Pending CN115749824A (en) | 2022-12-07 | 2022-12-07 | Hobbing cutter capable of effectively dispersing radial stress of bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115749824A (en) |
-
2022
- 2022-12-07 CN CN202211562142.8A patent/CN115749824A/en active Pending
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