Two-stage positive reaming cutter head of raise boring machine and raise boring machine

Abstract

The raise boring machine two-stage positive reaming cutter head comprises a cutter head center rod, a first cutter head assembly is arranged above the cutter head center rod, a second cutter head assembly is arranged below the cutter head center rod, the reaming diameter of the first cutter head assembly is smaller than that of the second cutter head assembly, and the center of the bottom of the cutter head center rod is connected with a variable-diameter short connecting rod. The cutterhead center rod is connected with a driving mechanism, and the driving mechanism drives the first cutterhead assembly and the second cutterhead assembly to rotate. The two-stage forward reaming cutter head is simple in structure and convenient to operate, the two-stage forward reaming cutter head, the front-stage cutter head, the rear-stage cutter head and the second-stage cutter head are installed on the cutter head center rod at the same time, the angle of the second-stage cutter head is enlarged, the reaming diameter ranges from 670 mm to 900 mm, the reaming range is wide, and the reaming efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of mining machinery technology, specifically relating to a two-stage positive expansion cutterhead for a riser drilling rig and the riser drilling rig itself. Background Technology

[0002] Cutting slots primarily create free faces and provide free space for large-scale mining. The excavation efficiency of cutting slots directly affects the continuous and balanced production of underground mines. Currently, cutting slot riser drilling rigs are commonly used for underground cutting slot excavation in medium and large-scale mines. However, current cutting slot excavation construction requires a pilot hole followed by reaming. During reaming, the reamer must be replaced stage by stage, requiring multiple operations to enlarge the hole to the required size. This process is cumbersome, inefficient, and the frequent reamer replacements can easily affect the accuracy of the reaming. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a two-stage positive reamer head for a well drilling rig and a well drilling rig; in particular, the two-stage reamer head is set at the front and rear, which has a wide range of hole diameters, eliminates the need for multiple reamer cutter replacements, and has high hole reaming accuracy, while greatly improving construction efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides a two-stage positive reamer cutterhead for a well drilling rig, comprising a cutterhead center rod, a first cutterhead assembly above the cutterhead center rod, and a second cutterhead assembly below the cutterhead center rod. The reaming diameter of the first cutterhead assembly is smaller than that of the second cutterhead assembly. A reducing diameter shorting rod is connected to the center of the bottom of the cutterhead center rod. The cutterhead center rod is connected to a drive mechanism, which drives the first cutterhead assembly and the second cutterhead assembly to rotate.

[0005] Furthermore, the center rod of the cutter head is a frustum-shaped cone with the diameter increasing from top to bottom. A first cutting groove is provided on the upper side of the center rod of the cutter head, and the first cutter head assembly is placed in the first cutting groove. A second cutting groove is provided on the lower side of the center rod of the cutter head, and the second cutter head assembly is placed in the second cutting groove. The first cutting groove and the second cutting groove are staggered.

[0006] Furthermore, the first cutter head assembly includes a first hob and a first support plate. The first cutter groove includes a first hob placement groove and a first support plate placement groove. The first cutter groove is stepped. A first shaft hole is provided in the first hob placement groove. The first hob is placed in the upper first hob placement groove. The central shaft of one side of the first hob is placed in the first shaft hole. The first support plate is placed in the lower first support plate placement groove. A first groove is provided above the first support plate. The central shaft of the other side of the first hob is embedded in the first groove. A plurality of first fixing holes are provided below the first support plate. Screws pass through the first fixing holes and are fixed to the first support plate placement groove.

[0007] Furthermore, the second cutter head assembly includes a second hob and a second support plate. The second cutter groove includes a second hob placement groove and a second support plate placement groove. The second cutter groove is stepped. A second shaft hole is provided in the second hob placement groove. The second hob is placed in the upper second hob placement groove. The central shaft of one side of the second hob is placed in the second shaft hole. The second support plate is placed in the lower second support plate placement groove. A second groove is provided above the second support plate. The central shaft of the other side of the second hob is embedded in the second groove. A plurality of second fixing holes are provided below the second support plate. Screws pass through the second fixing holes and are fixed to the second support plate placement groove.

[0008] Furthermore, the first cutter head assembly includes two sets, which are arranged 180° opposite to each other. The second cutter head assembly also includes two sets, which are arranged 180° opposite to each other.

[0009] Furthermore, the second cutter head assembly also includes a stabilizer rod assembly. Two stabilizer rod assemblies are provided and symmetrically placed between the two sets of second cutter head assemblies. The side wall of the cutter head center rod is provided with a stabilizer rod assembly placement groove. The stabilizer rod assembly is placed in the stabilizer rod assembly placement groove. The stabilizer rod assembly is detachably connected to the cutter head center rod and is used to adjust the hole enlarging accuracy of the second hob.

[0010] Furthermore, the stabilizer assembly includes a stabilizer block, a mounting base, and an adjustment pad. The stabilizer block is mounted on the mounting base, the mounting base is detachably connected to the cutter head center rod, and the adjustment pad is disposed between the mounting base and the cutter head center rod.

[0011] Furthermore, the cutter head center rod has an internal thread at its bottom center, and the variable diameter short rod has an external thread at its upper end, with the internal thread engaging with the external thread.

[0012] Furthermore, the first hob is an 8-inch hob, and the second hob is a 12-inch hob.

[0013] Furthermore, the present invention also provides a well drilling rig, including the above-mentioned well drilling rig with a two-stage positive expansion cutterhead.

[0014] Beneficial effects of the invention:

[0015] 1. The present invention has a simple structure and is easy to operate. Two stages of positive expanding cutter heads are installed on the central rod of the cutter head at the same time. With two stages of cutter heads, the angle of the second stage cutter head increases, and the diameter of the expanded hole ranges from 670 to 900 mm, resulting in a wide expansion range and high expansion efficiency.

[0016] 2. In this invention, all levels of the cutter head and the cutter head center rod are modularly installed, resulting in lower machining costs and easier maintenance and replacement.

[0017] 3. The present invention features a split-type stabilizing block, which facilitates flexible adjustment and ensures drilling accuracy. Attached Figure Description

[0018] Figure 1-3 This is a schematic diagram of the overall structure from various angles of an embodiment of the present invention.

[0019] Figure 4 This is an exploded view of the overall structure of an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the overall structure of an embodiment of the well drilling rig of the present invention.

[0021] In the picture:

[0022] 1. Cutter head center rod; 1-1. First hob placement slot; 1-2. First support plate placement slot; 1-3. Second hob placement slot; 1-4. Second support plate placement slot; 1-5. Stabilizer assembly placement slot;

[0023] 2. First cutter head assembly; 2-1. First hob; 2-2. First support plate; 2-2-1. First groove;

[0024] 3. Second cutter head assembly; 3-1. Second hob; 3-2. Second support plate; 3-2-1. Second groove;

[0025] 4. Stabilizer assembly; 4-1. Stabilizer block; 4-2. Mounting base; 4-3. Adjustment pad;

[0026] 5. Variable diameter shorting rod;

[0027] 6. Two-stage positive expander disc. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0032] like Figure 1-4 As shown, a two-stage positive reaming cutterhead for a well drilling rig includes a cutterhead center rod 1, a first cutterhead assembly 2 above the cutterhead center rod 1, and a second cutterhead assembly 3 below the cutterhead center rod 1. The reaming diameter of the first cutterhead assembly 2 is smaller than that of the second cutterhead assembly 3. The two stages of positive reaming cutterheads have a larger angle in the second cutterhead assembly 3. In this embodiment, the first roller cutter 2-1 is set to an 8-inch roller cutter, and the second roller cutter 3-1 is set to a 12-inch roller cutter. The reaming diameter ranges from 670 to 900 mm, providing a wide reaming range and high reaming efficiency.

[0033] like Figure 2 , Figure 3 As shown, the center rod 1 of the cutter head is a frustum-shaped cone with the diameter increasing from top to bottom. The upper side of the center rod 1 of the cutter head is provided with a first cutter groove, and the first cutter head assembly 2 is placed in the first cutter groove. The lower side of the center rod 1 of the cutter head is provided with a second cutter groove, and the second cutter head assembly 3 is placed in the second cutter groove. The first cutter groove and the second cutter groove are staggered.

[0034] Specifically, the first cutter head assembly 2 includes a first hob 2-1 and a first support plate 2-2. The first cutter groove includes a first hob placement groove 1-1 and a first support plate placement groove 1-2. The first cutter groove is stepped. A first shaft hole is provided in the first hob placement groove 1-1. The first hob 2-1 is placed in the upper first hob placement groove 1-1, and the central shaft on one side of the first hob 2-1 is placed in the first shaft hole. The first support plate 2-2 is placed in the lower first support plate placement groove 1-2. A first groove 2-2-1 is provided above the first support plate 2-2. The central shaft on the other side of the first hob 2-1 is embedded in the first groove 2-2-1 and connected to the side wall of the first groove 2-2-1 by screws, which are used to support and limit the first hob 2-1. Several first fixing holes are provided below the first support plate 2-2, and screws pass through the first fixing holes to fix it to the first support plate placement groove 1-2.

[0035] The first cutter head assembly 2 consists of multiple sets, which are distributed circumferentially around the central axis of the cutter head center rod 1. Preferably, the first cutter head assembly 2 provided in this embodiment includes two sets, which are arranged 180° opposite to each other.

[0036] like Figure 2 , Figure 3 As shown, the second cutter head assembly 3 includes a second hob 3-1 and a second support plate 3-2. The second cutter groove includes a second hob placement groove 1-3 and a second support plate placement groove 1-4. The second cutter groove is stepped. A second shaft hole is provided in the second hob placement groove 1-3. The second hob 3-1 is placed in the upper second hob placement groove 1-3, and the central shaft on one side of the second hob 3-1 is placed in the second shaft hole. The second support plate 3-2 is placed in the lower second support plate placement groove 1-4. A second groove 3-2-1 is provided above the second support plate 3-2. The central shaft on the other side of the second hob 3-1 is embedded in the second groove 3-2-1 and connected to the side wall of the second groove 3-2-1 by screws for supporting and limiting the second hob 3-1. Several second fixing holes are provided below the second support plate 3-2, and screws pass through the second fixing holes to fix it to the second support plate placement groove 1-4.

[0037] The second cutter head assembly 3 consists of multiple sets, which are distributed circumferentially around the central axis of the cutter head center rod 1. Specifically, the second cutter head assembly 3 provided in this embodiment includes two sets, which are arranged 180° opposite to each other.

[0038] Preferably, when there are fewer than three sets of second cutter head assemblies 3, the second cutter head assembly 3 further includes a stabilizer assembly 4. The stabilizer assembly 4 is connected to the outer peripheral wall of the cutter head center rod 1. During the reaming process of the second hob 3-1, the stabilizer assembly 4 contacts the hole wall, and the rotation of the cutter head center rod 1 can drive the second hob 3-1 and the stabilizer assembly 4 to rotate synchronously, thereby ensuring the reaming accuracy. Specifically, this embodiment provides two stabilizer assemblies 4, symmetrically placed between the two sets of second cutter head assemblies 3. The side wall of the cutter head center rod 1 is provided with a stabilizer assembly placement groove 1-5. The stabilizer assembly 4 is placed in the stabilizer assembly placement groove 1-5 and is detachably connected to the cutter head center rod 1, for adjusting the reaming accuracy of the second hob 3-1.

[0039] like Figure 4As shown, the stabilizer assembly 4 includes a stabilizer block 4-1, a mounting base 4-2, and an adjusting pad 4-3. The stabilizer block 4-1 is mounted on the mounting base 4-2, which is detachably connected to the cutter head center rod 1. The adjusting pad 4-3 is disposed between the mounting base 4-2 and the cutter head center rod 1. Preferably, the outer surface of the stabilizer block 4-1 has protrusions made of wear-resistant material to contact the rock wall. The mounting base 4-2 is mounted on the cutter head center rod 1 with screws, and the stabilizer block 4-1 is connected to the mounting base 4-2 with bolts. Multiple adjusting pads 4-3 can be provided, or different types can be used. For example, multiple adjusting pads 4-3 can be provided between the mounting base 4-2 and the cutter head center rod 1, or adjusting pads 4-3 of different thicknesses can be used to ensure that the stabilizer block 4-1 always fits tightly against the rock wall.

[0040] like Figure 3 As shown, the cutter head center rod 1 has an internal thread at its bottom center, and the variable diameter short rod 5 has an external thread at its upper end. The internal thread mates with the external thread to connect the cutter head center rod 1 and the variable diameter short rod 5. Both the first cutter head assembly 2 and the second cutter head assembly 3 are connected to a drive mechanism. The drive mechanism drives the first cutter head assembly 2 and the second cutter head assembly 3 to rotate. Preferably, the drive mechanism drives the cutter head center rod 1 to rotate, achieving synchronous rotation of the first cutter head assembly 2 and the second cutter head assembly 3.

[0041] The working process of this embodiment is as follows:

[0042] The drive mechanism drives the center rod 1 of the cutter head to rotate. The rotation of the center rod 1 of the cutter head drives the first cutter 2-1 and the second cutter 3-1 to rotate. During the hole reaming operation, the first cutter 2-1 first contacts the rock wall to perform small-diameter hole reaming. After the small-diameter hole reaming operation is completed, the second cutter 3-1 contacts the rock wall again to perform large-diameter hole reaming until the hole reaming operation is completed. There is no need to change the cutter in the middle.

[0043] like Figure 5 As shown, the present invention also provides a well drilling system, including the above-mentioned well drilling rig with a two-stage positive reamer.

[0044] The advantages and positive effects of the invention are:

[0045] 1. The present invention has a simple structure and is easy to operate. Two stages of positive expanding cutter heads are installed on the central rod of the cutter head at the same time. With two stages of cutter heads, the angle of the second stage cutter head increases, and the diameter of the expanded hole ranges from 670 to 900 mm, resulting in a wide expansion range and high expansion efficiency.

[0046] 2. In this invention, all levels of the cutter head and the cutter head center rod are modularly installed, resulting in lower machining costs and easier maintenance and replacement.

[0047] 3. The present invention features a split-type stabilizing block, which facilitates flexible adjustment and ensures drilling accuracy.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A two-stage positive diffuser head for a well drilling rig, characterized in that: The tool includes a center rod for the cutter head, a first cutter head assembly above the center rod, and a second cutter head assembly below the center rod. The enlargement diameter of the first cutter head assembly is smaller than that of the second cutter head assembly. A reducing diameter shorting rod is connected to the center of the bottom of the center rod. The center rod is connected to a drive mechanism, which drives the first cutter head assembly and the second cutter head assembly to rotate.

2. The two-stage positive reamer head for a well drilling rig as described in claim 1, characterized in that: The center rod of the cutter head is a frustum-shaped cone with the diameter increasing from top to bottom. A first cutting groove is provided on the upper side of the center rod of the cutter head, and the first cutter head assembly is placed in the first cutting groove. A second cutting groove is provided on the lower side of the center rod of the cutter head, and the second cutter head assembly is placed in the second cutting groove. The first cutting groove and the second cutting groove are staggered.

3. The two-stage positive reamer head for a well drilling rig as described in claim 2, characterized in that: The first cutter head assembly includes a first hob and a first support plate. The first cutter groove includes a first hob placement groove and a first support plate placement groove. The first cutter groove is stepped. A first shaft hole is provided in the first hob placement groove. The first hob is placed in the upper first hob placement groove. The central shaft of one side of the first hob is placed in the first shaft hole. The first support plate is placed in the lower first support plate placement groove. A first groove is provided above the first support plate. The central shaft of the other side of the first hob is embedded in the first groove. A plurality of first fixing holes are provided below the first support plate. Screws pass through the first fixing holes and are fixed to the first support plate placement groove.

4. The two-stage positive reamer head for a well drilling rig as described in claim 3, characterized in that: The second cutter head assembly includes a second hob and a second support plate. The second cutter groove includes a second hob placement groove and a second support plate placement groove. The second cutter groove is stepped. A second shaft hole is provided in the second hob placement groove. The second hob is placed in the upper second hob placement groove. The central shaft of one side of the second hob is placed in the second shaft hole. The second support plate is placed in the lower second support plate placement groove. A second groove is provided above the second support plate. The central shaft of the other side of the second hob is embedded in the second groove. A plurality of second fixing holes are provided below the second support plate. Screws pass through the second fixing holes and are fixed to the second support plate placement groove.

5. A two-stage positive reamer head for a well drilling rig as described in any one of claims 1 to 4, characterized in that: The first cutter head assembly includes two sets, which are arranged 180° opposite to each other; the second cutter head assembly includes two sets, which are arranged 180° opposite to each other.

6. A two-stage positive reamer head for a well drilling rig as described in any one of claims 1 to 4, characterized in that: The second cutter head assembly also includes a stabilizer bar assembly. Two stabilizer bar assemblies are provided and symmetrically placed between the two sets of second cutter head assemblies. The side wall of the cutter head center rod is provided with a stabilizer bar assembly placement groove. The stabilizer bar assembly is placed in the stabilizer bar assembly placement groove. The stabilizer bar assembly is detachably connected to the cutter head center rod and is used to adjust the hole enlarging accuracy of the second hobbing cutter.

7. A two-stage positive reamer head for a well drilling rig as described in claim 6, characterized in that: The stabilizer assembly includes a stabilizer block, a mounting base, and an adjustment pad. The stabilizer block is mounted on the mounting base, which is detachably connected to the center rod of the cutter head. The adjustment pad is disposed between the mounting base and the center rod of the cutter head.

8. A two-stage positive reamer head for a well drilling rig as described in any one of claims 1 to 4, characterized in that: The cutter head center rod has an internal thread at its bottom center, and the variable diameter short rod has an external thread at its upper end. The internal thread and the external thread are engaged.

9. A two-stage positive reamer head for a well drilling rig as described in claim 4, characterized in that: The first hob is an 8-inch hob, and the second hob is a 12-inch hob.

10. A well drilling rig, characterized in that: Includes the two-stage positive expansion cutterhead of the well drilling rig as described in any one of claims 1 to 9.

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