A cutting head for cantilever tunneling with convenient replacement of cutting teeth

Abstract

The invention provides a cutting head for cantilever tunneling that is convenient for replacing cutting teeth, including a tool holder, a plurality of cutting teeth are installed on the tool holder, and a retaining frame is provided on the inner side of the tool holder; a mounting portion is provided at the rear end of the tool holder, and a connecting portion matching the mounting portion is provided at the rear end of the retaining frame, a limiting step is provided at the connecting portion, the limiting step abuts against the outer end surface of the mounting portion, and a connecting piece fixes the connecting portion and the mounting portion so that the retaining frame abuts against each cutting tooth on the tool holder; a plurality of mounting grooves are provided on the side wall of the tool holder, and the cutting teeth are respectively installed in the mounting grooves, and the tips of the cutting teeth all extend outward from the surface of the tool holder. After each cutting tooth is installed in the tool holder, it is fixed with the help of a retaining frame, and the structural stability is good. The cutting teeth can be installed and disassembled separately, and when the cutting teeth are damaged, they can be replaced separately. A signal detection unit is provided in the mounting groove corresponding to the root of the cutting teeth, and the signal detection unit includes a force intensity sensing sensor and a cutting tooth damage detection sensor to monitor the working status of the cutting teeth in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of cantilever tunnel boring machine equipment, and in particular relates to a cutting head for convenient replacement of cutting teeth for cantilever tunnel boring. Background Art

[0002] Roadheaders are a general term for underground tunnel excavation equipment, such as coal mining machines, tunnel boring machines, and shield machines used in subway construction. They all use picks embedded on a rotating disk for excavation operations. As the traveling mechanism of the roadheader moves forward, the cutting head in the working mechanism continues to rotate, and the picks installed on the cutting head cut and crush coal and rocks. Since the pick equipment directly cuts underground rocks, coal, and soil when in use, the picks are subjected to huge impacts during operation. When the cutting blade tip is damaged or shortened, the cutting efficiency of rocks, coal, etc. will be greatly reduced. Generally, the picks need to be replaced at this time. However, there are a large number of picks on a roadheader drill bit, and the existing picks are usually one-piece components. Although the single strength of the pick can be increased to a certain extent, due to the rapid wear of the picks, the current technology is very time-consuming to replace all the picks, and replacing all of them at the same time will cause a waste of cost. In many cases, one or more picks are damaged in a metal part. Therefore, it is necessary to design a cantilever roadheader cutting head that can be replaced individually and is convenient for picking, so as to facilitate the picking loading and unloading operation and save the use cost. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a cutting head for cantilever tunneling that is convenient for replacing cutting teeth.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A cutting head for cantilever tunneling that is convenient for replacing cutting teeth, comprising a tool holder, a plurality of cutting teeth are mounted on the tool holder, and a retaining frame is provided on the inner side of the tool holder; a mounting portion is provided at the rear end of the tool holder, a connecting portion matching the mounting portion is provided at the rear end of the retaining frame, a limiting step is provided at the position of the connecting portion, the limiting step abuts against the outer end surface of the mounting portion, the connecting portion and the mounting portion are fixed by a connecting piece, and then the retaining frame abuts against each cutting tooth on the tool holder; a plurality of mounting grooves are provided on the side wall of the tool holder, the cutting teeth are respectively mounted in the mounting grooves, and the tips of the cutting teeth all protrude out of the surface of the tool holder.

[0006] Furthermore, the connecting piece is a screw.

[0007] Furthermore, a screw connection hole is provided on the mounting portion of the tool holder, and a screw penetration hole is provided on the connecting portion of the retaining frame.

[0008] Furthermore, the screw penetration hole is provided with a sink.

[0009] Furthermore, the front end of the tool holder is hemispherical.

[0010] Furthermore, the tool holder main body structure is in a conical cylindrical shape.

[0011] Furthermore, a fixing portion is provided on the periphery of the connecting portion of the tool holder, and a fixing hole is provided on the fixing portion.

[0012] Furthermore, a positioning portion is provided at the root of the pick, and a groove is provided in the mounting groove corresponding to the positioning portion.

[0013] Furthermore, a signal detection unit is provided in the installation groove corresponding to the root of the pick, and the signal detection unit includes a force intensity sensing sensor and a pick damage detection sensor.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The invention has a reasonable structural design. After each pick is installed in the tool holder, it is fixed with the help of a retaining frame. When the cutting head is working, the retaining frame bears the force of the pick. The structure has good stability, and the pick can be installed and disassembled separately. When the pick is damaged, it can be replaced separately. The operation is very convenient and can effectively save the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure created by the present invention;

[0018] Figure 2 A schematic diagram of the tool holder part in the invention;

[0019] Figure 3 A schematic diagram of a retaining frame portion in the invention;

[0020] Figure 4 A schematic diagram of a pick cutter in the present invention;

[0021] Figure 5 A schematic diagram of a pick with side wings in an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the use of a pick with flanks in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] A cutting head for cantilever tunneling that is convenient for replacing cutting teeth, such as Figures 1 to 6 As shown, it includes a tool holder 1, on which a plurality of cutting teeth 2 are installed, and a retaining frame 3 is provided on the inner side of the tool holder; a mounting portion 4 is provided at the rear end of the tool holder, a connecting portion 5 matching the mounting portion is provided at the rear end of the retaining frame, a limiting step 6 is provided at the connecting portion, the limiting step abuts against the outer end surface of the mounting portion, the connecting portion and the mounting portion are fixed by a connecting piece 7, and then the retaining frame abuts against each cutting tooth on the tool holder; a plurality of mounting grooves 8 are provided on the side wall of the tool holder, the cutting teeth are respectively installed in the mounting grooves, and the tips 9 of the cutting teeth all protrude out of the surface of the tool holder.

[0028] In an optional embodiment, a signal detection unit is provided in the installation groove corresponding to the root of the pick, and the signal detection unit includes a force intensity sensing sensor and a pick damage detection sensor. The force intensity sensing sensor and the pick damage detection sensor are connected to an external control device via a wireless signal. The control device includes a commercially available PLC device and has an information display screen. At the same time, an alarm is also provided on the control device. The signals of the force intensity sensing sensor and the pick damage detection sensor can be transmitted to the monitoring device and displayed in real time on the information display screen.

[0029] For example, if the force intensity sensing sensor reports that the rock strength is greater than 80Mpa, an alarm will be issued, and the operator can intervene in time according to the information on the information display screen. As an example, the pick damage detection sensor can use a pressure sensor. When the boom tunneling machine is working, if the pressure signal of one or several pick damage detection sensors on the cutting head suddenly drops to 0, it will be marked as a damaged part by the controlled device. As the boom tunneling machine operates, if the pressure signal of the damaged part is continuously detected and never reappears, it will be marked as a damaged tooth, prompting the operator to perform maintenance and replacement.

[0030] The connecting member is a screw. A screw connection hole 10 is provided on the mounting portion of the tool holder, and a screw insertion hole 11 is provided on the connecting portion of the retaining frame. Preferably, the screw insertion hole has a sink 12, and the nut of the screw is partially immersed in the sink to avoid interference. The front end of the tool holder is hemispherical, and the main structure of the tool holder is conical. The picks are evenly distributed on the front end and the main structure of the tool holder.

[0031] A fixing part 13 is provided on the periphery of the connecting part of the tool holder, and a fixing hole is provided on the fixing part. A positioning part 14 is provided at the root of the pick, and a matching groove 15 is provided in the mounting groove corresponding to the positioning part. The diameter of the positioning part is larger than the diameter of the main part of the pick, and a positioning platform is formed between the positioning part and the main body of the pick.

[0032] In an optional embodiment, if Figure 5 and Figure 6 As shown, the outer circumference of the positioning part of the pick is symmetrically provided with two side wings 16, and the matching groove is provided with a baffle on one side of the inner wall of the tool holder, and the baffle is provided with two notches 17 for the positioning part to pass through, and a limiting cavity is formed between the baffle and the matching groove. When installing the pick, it is only necessary to align the side wings on both sides of the positioning part with the notches, push the pick into the installation groove, and then screw the pick to immerse the side wing part in the baffle, and then install the retainer to hold the pick on the tool holder.

[0033] The invention has a reasonable structural design. After each pick is installed in the tool holder, it is fixed with the help of a retaining frame. When the cutting head is working, the retaining frame bears the force of the pick. The structure has good stability, and the pick can be installed and disassembled separately. When the pick is damaged, it can be replaced separately. The operation is very convenient and can effectively save the use cost.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cutting head for cantilever tunneling that facilitates the replacement of cutting teeth, characterized in that: It comprises a tool holder, on which a plurality of cutting teeth are detachably mounted, and a retaining frame is provided on the inner side of the tool holder; a mounting portion is provided at the rear end of the tool holder, a connecting portion matching the mounting portion is provided at the rear end of the retaining frame, a limiting step is provided at the connecting portion, the limiting step abuts against the outer end surface of the mounting portion, the connecting portion and the mounting portion are fixed by a connecting piece, and the retaining frame abuts against each cutting tooth on the tool holder; a plurality of mounting grooves are provided on the side wall of the tool holder, the cutting teeth are respectively mounted in the mounting grooves, and the tips of the cutting teeth all protrude out of the surface of the tool holder.

2. A cutting head for cantilever tunneling and convenient replacement of cutting teeth according to claim 1, characterized in that: The connecting piece is a screw.

3. A cutting head for cantilever tunneling and convenient replacement of cutting teeth according to claim 2, characterized in that: The mounting portion of the tool holder is provided with a screw connection hole, and the connecting portion of the retaining frame is provided with a screw penetration hole.

4. A cutting head for cantilever tunneling and convenient replacement of cutting teeth according to claim 2, characterized in that: The screw penetration hole is provided with a sink.

5. The cutting head for cantilever tunneling and convenient replacement of cutting teeth according to claim 1, characterized in that: The front end of the tool holder is hemispherical.

6. A cutting head for cantilever tunneling for easy replacement of cutting teeth according to claim 1, characterized in that: The tool holder main body structure is in a cone shape.

7. A cutting head for cantilever tunneling and convenient replacement of cutting teeth according to claim 1, characterized in that: A fixing portion is arranged on the periphery of the connecting portion of the tool holder, and a fixing hole is arranged on the fixing portion.

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