CN215718773U - Front and edge T-shaped shaft duplex hobbing cutter - Google Patents

Abstract

The utility model belongs to the technical field of hobs, and provides a front and edge T-shaped shaft duplex hob which comprises a hob shaft, hob bodies, end covers, bearing pairs, floating oil seals and flat cutter rings, wherein the floating oil seals are arranged on one side, facing the end covers, in the hob bodies, the number of the hob bodies is two, the two hob bodies are distributed axially, one bearing pair is arranged in each hob body, a shaft shoulder is arranged on the outer side of the middle of the hob shaft and between the two hob bodies, the middle floating oil seals are arranged on the outer sides of the shaft shoulders, the hob shaft extends out from two ends of the two hob bodies, a hob shaft center hole is formed in the axis of the hob shaft, a mandrel material made of hard alloy is arranged in the shaft center hole, two annular grooves are formed in the mandrel rod, a C-shaped clamping ring is arranged in each annular groove, a clamping groove clamped with the C-shaped clamping ring is formed in the inner part of the shaft center hole, and two ends of the mandrel hole are provided with plugs. The device has reasonable design and simple structure, can relatively rotate the two cutter bodies, is favorable for prolonging the service life of the hob, has higher utilization rate and is suitable for large-scale popularization.

Description

Front and edge T-shaped shaft duplex hobbing cutter

Technical Field

The utility model belongs to the field of hobs, and particularly relates to a front and edge T-shaped shaft duplex hob.

Background

The disc cutter is an excavating tool for crushing hard rocks, is arranged at the head of large-scale trenchless construction equipment such as a shield, a TBM (tunnel boring machine), a pipe jacking machine and the like, has the distribution conditions including front distribution and edge distribution, and is used for cutting rock on a tunnel face and stripping the rock from the tunnel face. The disc cutter is widely applied to subway tunnels, railway tunnels, diversion tunnels and urban underground pipe network constructors. Disc cutters are cutters with replaceable cutter rings, usually having a single-edge, double-edge and multiple-edge, and are usually mounted on the shield machine cutter head in a radial or spiral arrangement.

At present, a double-edged hob which is commonly used is characterized in that the hob comprises a hob body, two cutter rings are arranged on the hob body, and two sets of bearings are arranged. Therefore, the distance from the cutter ring of the same hob to the circle center of the cutter head is different, the linear speed is different, the damage is easy to occur, and the cutter shaft is easy to be twisted strongly to a certain degree to cause the internal damage, so that the integral strength of the cutter shaft is influenced.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems of the double-edged hob, the utility model provides the front and edge T-shaped shaft duplex hob which is reasonable in design, simple in structure, strong in torsion resistance, long in service life and high in utilization rate.

In order to achieve the above purpose, the technical scheme adopted by the utility model is that the front and edge T-shaped shaft duplex hobbing cutter provided by the utility model comprises a cutter shaft, cutter bodies are arranged on the cutter shaft, end covers are arranged at the ends of the cutter bodies, a bearing pair and a floating oil seal are arranged inside the cutter bodies, the bearing pair comprises two bearings which are distributed axially, a flat cutter ring is arranged outside the cutter bodies, the number of the cutter bodies is two, the cutter bodies are distributed axially, a bearing pair is arranged inside each cutter body, one side of the cutter body, which faces the end covers, is provided with one floating oil seal, a shaft shoulder is arranged at the position between the two cutter bodies and outside the middle of the cutter shaft, a middle floating oil seal is arranged outside the shaft shoulder, the two ends of the cutter shaft extend out from the two ends of the two cutter bodies, a shaft center hole is arranged at the shaft center of the cutter shaft, and a core rod material is arranged in the shaft hole, the utility model discloses a core rod, including core rod, be provided with two ring channels that are close to its both ends and distribute on the core rod, be provided with C type rand in the ring channel, the inside in axle center hole is provided with the draw-in groove with C type rand joint, the both ends in axle center hole are provided with the countersunk head groove, the screw thread is provided with the end cap in the countersunk head groove.

Preferably, the core rod material includes the semi-rod of two axial docks, be provided with an annular groove and C type rand on the semi-rod, the butt joint terminal surface of semi-rod is provided with the butt joint portion of semi-cylindrical, the tip of semi-rod towards the end cap is provided with the top, the diameter of top is less than the diameter of semi-rod.

Preferably, the end surface of the plug is provided with a spherical convex part.

Preferably, the length of the core rod is smaller than that of the shaft center hole, and a pressure balance assembly is movably arranged between the core rod and the plug.

Compared with the prior art, the utility model has the advantages and positive effects that:

1. according to the front and edge T-shaped shaft duplex hob, the two hob bodies are adopted to respectively bear the two flat-top cutter rings and are matched with the two bearing pairs, the premature damage of the hob bodies due to the fact that the linear speeds of the cutting edges of the two flat-top cutter rings are different is effectively avoided, the working stability and the sealing performance of the two hob bodies are guaranteed through the middle floating oil seal, and the bearing selection specification of the device is relatively large, so that high bearing strength is obtained; by using the core bar material as the reinforcing structure of the shaft center of the cutter shaft, the structural strength of the device is improved, and the actual service life of the device is effectively prolonged. The device has the advantages of reasonable design, simple structure, capability of relatively rotating the two cutter bodies, stronger torsion resistance, contribution to prolonging the service life of the hob, higher utilization rate and suitability for large-scale popularization.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a dual hob with a front and an edge T-shaped shaft according to the embodiment;

FIG. 2 is an isometric view of a core rod provided by an embodiment;

FIG. 3 is an enlarged schematic view of the structure A in FIG. 1 according to an exemplary embodiment;

in the above figures, 1, a knife shaft; 1a, a shaft shoulder; 1b, an axle center hole; 1c, a countersunk groove; 2. a cutter body; 3. a pair of bearings; 4. floating oil seal; 5. an end cap; 6. flat-top cutter ring; 7. a middle floating oil seal; 8. a core rod material; 81. an annular groove; 82. a semi-bar; 821. a docking portion; 822. ejecting the head; 823. a spherical convex part; 9. a C-shaped collar; 10. a plug; 11. a pressure balancing assembly.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" used herein refer to the same directions as the drawings, and do not limit the structure.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.

In an embodiment, as shown in fig. 1, fig. 2 and fig. 3, the front-side and edge T-shaped shaft duplex hob provided by the present invention includes a hob shaft 1, a hob body 2 is disposed on the hob shaft 1, an end cover 5 is disposed at an end of the hob body 2, a bearing pair 3 and a floating oil seal 4 are disposed inside the hob body 2, the bearing pair 3 includes two bearings axially distributed, and a flat top cutter ring 6 is disposed outside the hob body 2, wherein the structures of the floating oil seal 4, the bearing pair 3 and the flat top cutter ring 6 are prior art, and are not described herein again. On the basis of the prior art, the number of the cutter bodies 2 provided by the utility model is two, the cutter bodies are distributed axially, a bearing pair 3 is arranged inside each cutter body 2, one side of the inside of each cutter body 2 facing an end cover 5 is provided with a floating oil seal 4, the middle outer side of the cutter shaft 1 and the position between the two cutter bodies 2 are provided with a shaft shoulder 1a, the outer side of the shaft shoulder 1a is provided with the middle floating oil seal 4, two ends of the cutter shaft 1 extend out from two ends of the two cutter bodies 2, the shaft center of the cutter shaft 1 is provided with a shaft center hole 1b, a mandrel bar 8 is arranged in the shaft center hole 1b, the mandrel bar 8 is made of hard alloy, the mandrel bar 8 is provided with two annular grooves 81 distributed close to the two ends of the mandrel bar, the annular grooves 81 are internally provided with C-shaped clamping rings 9, the inside of the shaft center hole 1b is provided with clamping grooves (not shown in the figure) clamped with the C-shaped clamping rings 9, two ends of the shaft center hole 1b are provided with countersunk grooves 1C, the countersunk head groove 1c is provided with a plug 10 in a threaded manner.

In the device, the two cutter bodies 2 respectively bear the two flat-top cutter rings 6, and the two bearings are matched with the pair 3, namely four bearings, so that the two flat-top cutter rings 6 provide effective relative motion conditions, the two cutter bodies 2 are ensured to have reasonable rotation capacity, and the two cutter bodies 2 are effectively prevented from being prematurely damaged due to different speeds of the cutting edge lines of the flat-top cutter rings 6. Meanwhile, the arrangement of the shaft shoulder 1a of the device is beneficial to improving the axial stability of the two cutter bodies 2, the working stability and the sealing performance of the two cutter bodies 2 are ensured by the middle floating oil seal 4, and the bearing selection specification of the device is convenient to be relatively large so as to obtain higher bearing strength. Furthermore, the core rod material 8 has the advantages of high hardness, good wear resistance and high strength, and is used as a reinforcing structure of the axis of the cutter shaft 1, so that the structural strength of the device is improved, and the actual service life of the device is effectively prolonged. The countersunk grooves 1c and the plugs 10 are designed to facilitate the assembly of the core rod 8, and to improve the sealing properties at both ends of the axial hole 1 b.

In order to improve the practicability of the core rod material 8, the core rod material 8 provided by the utility model comprises two axially butted half rod materials 82, wherein an annular groove 81 and a C-shaped clamping ring 9 are arranged on the half rod materials 82, a semi-cylindrical butting part 821 is arranged on the butting end face of each half rod material 82, a top head 822 is arranged at the end part, facing the plug 10, of each half rod material 82, and the diameter of each top head 822 is smaller than that of each half rod material 82. The butt joint part 822 can realize tight splicing of the butt joint surfaces of the two semi-bars, and the top 822 can facilitate the core bar 8 to be impacted or jacked into the designed position in the shaft center hole 1b, and cannot generate deformation enough to influence disassembly. C type rand 9 in ring channel 81 can be packed into to the draw-in groove by manual work or mechanical equipment with the mode of joint, plays spacing effect, and whole core rod 8 adopts the assembly structure of two halves formula, can reduce the secondary wearing and tearing of C type rand 9 during the assembly to guarantee that core rod 8 and C type rand 9 have longer life, the practicality is stronger, and the utilization ratio is higher.

Considering the need to disassemble the semi-bars 82, such as ejecting the two semi-bars 82 by impacting or pressing, the present invention further provides a spherical protrusion on the end surface of the ejector 822, which can provide a reasonable contact point for impacting or pressing, and avoid the parallel connection of the ends of the semi-bars 82, which increases the difficulty of disassembly.

For earth pressure and TBM equipment, the length of the core rod material 8 can be designed to be the length which is propped against the end part of the plug 10 so as to provide higher structural strength, for a slurry shield machine, the length of the core rod material 8 is smaller than that of the axial hole 1b, a pressure balance assembly 11 is movably arranged between the core rod material 8 and the plug 10, and the working performance of the device in the shield process is ensured by additionally arranging the pressure balance assembly. The pressure balance assembly 11 includes a piston body, the piston body is movably disposed in the axial hole 1b and a plurality of piston rings are disposed between the piston body and the axial hole 1b, and the piston body can automatically perform axial movement according to pressure change to achieve a pressure balance effect.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

Claims (4)

1. A front and edge T-shaped shaft duplex hobbing cutter comprises a cutter shaft, cutter bodies are arranged on the cutter shaft, end covers are arranged at the end parts of the cutter bodies, a bearing pair and a floating oil seal are arranged inside the cutter bodies, the bearing pair comprises two bearings which are axially distributed, and a flat cutter ring is arranged outside the cutter bodies, and the hobbing cutter is characterized in that the cutter bodies are two and axially distributed, one bearing pair is arranged inside each cutter body, one side of the inside of each cutter body, which faces the end cover, is provided with a floating oil seal, a shaft shoulder is arranged on the outer side in the middle of the cutter shaft and positioned between the two cutter bodies, a middle floating oil seal is arranged on the outer side of the shaft shoulder, two ends of the cutter shaft extend out from two ends of the two cutter bodies, a shaft center hole is formed in the shaft center of the cutter shaft, a core rod is arranged in the shaft center hole, and the core rod is made of hard alloy, be provided with two ring channels that are close to its both ends and distribute on the core rod material, be provided with C type rand in the ring channel, the inside in axle center hole is provided with the draw-in groove with C type rand joint, the both ends in axle center hole are provided with the countersunk head groove, the screw thread is provided with the end cap in the countersunk head groove.

2. The double hob according to claim 1, wherein the core bar comprises two axially butt jointed half bars, the half bars are provided with an annular groove and a C-shaped collar, the butt joint end faces of the half bars are provided with half cylindrical butt joint portions, the end portions of the half bars facing the plugs are provided with plugs, and the diameter of the plugs is smaller than that of the half bars.

3. The double hob of claim 2, wherein the end face of said top is provided with spherical protrusions.

4. The double hob of claim 1, wherein the length of the core rod is less than the length of the central hole, and a pressure balance assembly is movably disposed between the core rod and the plug.

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