Raise hob

Abstract

The utility model discloses a raise hob which comprises a roller body and a mandrel connected with the roller body into a whole, a plurality of hard alloy tooth rows are arranged on the periphery of the roller body, plug pin holes are formed in the roller body among the hard alloy tooth rows, each plug pin hole comprises a small-diameter part at the front section and a large-diameter part at the rear section, the small-diameter part at the front section of each plug pin hole is communicated with a bearing cavity, and the large-diameter part at the rear section of each plug pin hole is communicated with a bearing cavity. The plug pin is arranged in the plug pin hole, the plug pin is provided with an oil injection hole used for being communicated with a bearing cavity, an oil injection screwed plug is arranged in the oil injection hole, the roller body opposite to the outer end face of the plug pin is provided with an annular groove, a clamping spring is embedded in the annular groove and abuts against the outer end face of the plug pin, and solid filling glue is injected into the vacant space of the plug pin hole. A plug pin hole is formed in the roller, so that the phenomenon of idle work caused by accumulation of grease in an inner cavity of the bearing when the roller is arranged on the mandrel is effectively avoided, and the grease lubrication effect in the bearing is improved; the oil injection hole is integrated on the plug pin, so that the processing difficulty of the oil injection hole is reduced.

Description

Technical Field

[0001] The utility model relates to a patio cutter, belonging to the technical field of rock breaking tools. Background Art

[0002] Raise boring rigs, a vital piece of mining equipment and essential equipment for hydropower station construction, are widely used in underground transportation tunnels and wellbore construction in stable geological conditions. They primarily utilize hydraulic transmission to generate rotary torque in the hydraulic motor, driving the drilling system and rotating the drill rod and drill bit. Simultaneously, the thrust cylinder applies propulsion to the drill bit during drilling and a reverse lift force to the cutterhead during reaming, acting on the rock. As a key rock-breaking tool in mechanical excavation, raise cutters require a high level of cost-effectiveness. Therefore, simplifying the design and reducing manufacturing and maintenance costs without compromising performance are crucial.

[0003] At present, common roof rollers are mainly based on steel ball locking structures. Manufacturers choose to design and process pin holes on the core shaft to place steel balls. The hole mouth is sealed by welding, and another oil injection channel is added to penetrate the pin hole for oil injection. For this structure, although it meets the performance of the product, the pin hole is placed on the core shaft, which is an eccentric hole structure. It is also a deep hole drilling and reaming, which has high requirements for equipment and tooling. Iron chips are prone to accumulation and drill breakage during processing, resulting in difficulty, long cycle and high cost for the entire production. At the same time, after the pin hole mouth is welded, it is extremely difficult to disassemble the roller after sale.

[0004] The existing toothed hob has a complex structure, and it is necessary to design a new type of toothed hob that effectively retains the performance of the roof hob, while reducing the difficulty and cost of production and manufacturing, and also provides great convenience for removing steel balls during repair. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a patio hob.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The characteristics of the roof roller are as follows: it includes a roller body and a core shaft connected to it, the outer periphery of the roller body is provided with multiple rows of carbide teeth, the roller body between the carbide teeth rows is provided with a plug pin hole, the plug pin hole includes a small diameter portion in the front section and a large diameter portion in the rear section, the small diameter portion in the front section of the plug pin hole is communicated with the bearing chamber, the plug pin is installed in the plug pin hole, an oil filling hole for communicating with the bearing chamber is opened on the plug pin, an oil filling plug is installed in the oil filling hole, an annular groove is opened on the roller body opposite to the outer end face of the plug pin, a retaining spring is embedded in the annular groove, the retaining spring is in contact with the outer end face of the plug pin, and the vacant space of the plug pin hole is injected with solid filling glue.

[0008] Furthermore, in the above-mentioned roof cutter, a pin hole is provided in the roller body between the third cemented carbide tooth row and the fourth cemented carbide tooth row.

[0009] Furthermore, in the above-mentioned roof cutter, the angle α between the pin hole and the longitudinal center line of the bearing is ±50°.

[0010] Furthermore, in the above-mentioned roof cutter, the outer circle of the large-diameter portion of the rear section of the plug pin is provided with an annular sealing groove, and a sealing ring is embedded in the annular sealing groove.

[0011] Furthermore, in the above-mentioned patio cutter, the plug pin is a flat-head type plug pin.

[0012] Furthermore, in the above-mentioned patio cutter, the material of the plug pin is 45# steel.

[0013] Furthermore, in the above-mentioned roof cutter, the roller body is made of low-carbon alloy steel 15MnNi4Mo, 15CrNiMo, 42CrMo or 20CrNiMo.

[0014] Compared with the prior art, the present invention has significant advantages and beneficial effects, which are specifically reflected in the following aspects:

[0015] ① The utility model has a new type of roof cutter with a multifunctional structure. A plug pin hole is provided on the roller, which effectively avoids the phenomenon of grease accumulation in the bearing cavity and doing useless work when it is set on the core shaft, thereby improving the grease lubrication effect inside the bearing and improving product performance;

[0016] ② The pin hole is placed on the roller, which ensures the product function while reducing the difficulty and cost of processing and production, shortening the processing cycle and improving the cost performance of the product;

[0017] ③ The oil filling hole is integrated on the plug pin, which reduces the difficulty of oil filling hole processing and further shortens the processing cost and cycle. The integrated design of the plug pin hole makes it easier to disassemble and assemble the hob for repair and maintenance. It is suitable for all hobs with steel ball locking structure, such as insert tooth hobs, steel tooth hobs, and steel insert tooth mixed tooth rows, with size specifications ranging from 6" to 18".

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the specific embodiments of the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 : A schematic structural diagram of the utility model;

[0021] Figure 2 : Schematic diagram of the structure of the plug pin hole;

[0022] Figure 3 : Schematic diagram of the structure of the plug pin;

[0023] Figure 4 : Schematic diagram of the structure of the retaining spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, directional terms and order terms are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0026] like Figures 1 to 4As shown, the roof hob comprises a roller body 2 and a core shaft 1 connected thereto. The outer periphery of the roller body 2 is provided with multiple rows of carbide teeth. A plug pin hole is provided on the roller body between the third and fourth carbide teeth rows. The included angle α between the plug pin hole and the longitudinal center line of the bearing 8 is ±50°, with the clockwise direction being positive and the counterclockwise direction being negative. The plug pin hole comprises a small diameter portion at the front section and a large diameter portion at the rear section. The small diameter portion at the front section of the plug pin hole is The outer end of the roller body 2 communicates with the bearing chamber, and a plug pin 3 is installed in the plug pin hole. The plug pin 3 is a flat-headed plug made of 45# steel. An oil filling hole is formed on the plug pin 3 to connect it to the bearing chamber. An oil plug 5 is installed in the oil filling hole. The oil filling hole is integrated into the plug pin 3. An annular groove is formed on the roller body 2 opposite the outer end of the plug pin 3. A retaining spring 7 is inserted into the annular groove and abuts the outer end of the plug pin 3. The vacant space in the plug pin hole is filled with solid filler 6. The plug pin hole is sealed by locking the retaining spring and filled with solid filler. The solid filler is heat-resistant, pressure-resistant, and corrosion-resistant.

[0027] An annular sealing groove is provided on the outer circle of the large diameter portion of the rear section of the plug pin 3, and a sealing ring 4 is embedded in the annular sealing groove.

[0028] The material of the roller body 2 is low carbon alloy steel 15MnNi4Mo, 15CrNiMo, 42CrMo or 20CrNiMo.

[0029] In summary, the utility model has a new type of roof cutter with a multifunctional structure. The pin hole is provided on the roller, which effectively avoids the phenomenon of grease accumulation in the bearing cavity and doing useless work caused by the roller being provided on the core shaft, thereby improving the grease lubrication effect inside the bearing and improving product performance.

[0030] The pin hole is placed on the roller, which ensures the product function while reducing the difficulty and cost of processing and production, shortening the processing cycle and improving the cost performance of the product;

[0031] The oil filling hole is integrated on the plug pin, which reduces the difficulty of processing the oil filling hole and further shortens the processing cost and cycle; the integrated design of the plug pin hole makes it easier to disassemble and assemble the hob for repair and maintenance.

[0032] Applicable to all ball lock structure hobs, such as insert tooth hobs, steel tooth hobs, and steel insert tooth mixed tooth rows, with size range of 6" to 18".

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention. It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

[0034] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

Claims

1. Patio hob, characterized by: The invention comprises a roller body (2) and a core shaft (1) connected thereto. The outer periphery of the roller body (2) is provided with multiple rows of carbide teeth. The roller body between the carbide teeth is provided with a plug pin hole. The plug pin hole comprises a small diameter portion at the front section and a large diameter portion at the rear section. The small diameter portion at the front section of the plug pin hole communicates with the bearing chamber. The plug pin (3) is installed in the plug pin hole. An oil filling hole for communicating with the bearing chamber is opened on the plug pin (3). An oil filling plug (5) is installed in the oil filling hole. An annular groove is opened on the roller body (2) opposite to the outer end face of the plug pin (3). A retaining spring (7) is embedded in the annular groove. The retaining spring (7) abuts against the outer end face of the plug pin (3). The vacant space of the plug pin hole is injected with solid filling glue (6).

2. The patio cutter according to claim 1, characterized in that: A plug pin hole is provided on the roller body between the third cemented carbide tooth row and the fourth cemented carbide tooth row.

3. The patio cutter according to claim 1 or 2, characterized in that: The included angle α between the plug pin hole and the longitudinal center line of the bearing is ±50°.

4. The patio cutter according to claim 1, characterized in that: An annular sealing groove is provided on the outer circle of the large diameter portion of the rear section of the plug pin (3), and a sealing ring (4) is embedded in the annular sealing groove.

5. The patio cutter according to claim 1, characterized in that: The plug pin (3) is a flat head type plug pin.

6. The patio cutter according to claim 1, characterized in that: The material of the plug pin (3) is 45# steel.

7. The patio cutter according to claim 1, characterized in that: The material of the roller body (2) is low carbon alloy steel 15MnNi4Mo, 15CrNiMo, 42CrMo or 20CrNiMo.

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