Indexing cam rod replacing library mechanism for rotary drill

Abstract

The utility model relates to an indexing cam rod replacing library mechanism for a rotary drill rig, which is characterized in that a driving sleeve is arranged on a tower frame, a threaded convex block is arranged on the driving sleeve, a plurality of rollers are arranged on the outer edge of a storage rod turntable, the plurality of rollers are uniformly distributed on the outer edge of the storage rod turntable, and the threaded convex block is arranged on the outer edge of the storage rod turntable. The threaded protruding block is meshed with the roller. A threaded lug on the driving sleeve is in rolling contact with a roller of the driven turntable to realize the indexing rotation motion of the turntable of the rod storage library; compared with a large gear ring, the driven rotary disc is easy to manufacture, the rollers installed on the rotary disc are convenient to replace, and meanwhile the abrasion clearance between the rollers and the cam can be eliminated by adjusting the center distance. In addition, fixed-angle intermittent rotating motion can be achieved through the design of motion parameters and geometric dimensions of the threaded protruding blocks, it can be ensured that the drill rod reaches the rod connecting position without additionally arranging an alignment marker and a positioning sensor, and the positioning precision is high.

Description

Technical Field

[0001] This application relates to the technical field of rod changing mechanisms, and in particular to an indexing cam rod changing magazine mechanism for roller cone drilling rigs. Background Technology

[0002] Rotary cone drills are a type of high-efficiency drilling equipment widely used in large open-pit mines. Drilling is the first step in open-pit mining, providing holes for placing explosives in blasting operations. The depth of blast holes in deep-hole blasting is typically 15-20 meters. However, due to the height limitations of the drilling rig tower, the length of commonly used drill rods is generally in the range of 3-9 meters. Therefore, a single blast hole requires at least two or more drill rods to be spliced ​​together to achieve the required drilling depth. Common rod changer systems are divided into two-rod systems and multi-rod systems. For two-rod changers, a swivel hydraulic cylinder is usually used to control the position of the drill rods, allowing different drill rods to reach a fixed drilling position. For multi-rod (more than two) changers, the drill rods are evenly distributed on a large gear ring, and the position of the drill rods is controlled by external gear meshing. Rotation allows different drill rods to reach the drilling position, completing the splicing and disassembly of the drill rods.

[0003] In related technologies, such as Chinese patent CN207073559U, a novel cam turntable mechanism is disclosed. The motor output shaft is connected to the planetary reducer input shaft, and the planetary reducer output end is connected to a cam worm gear drive. The cam worm gear has a cam groove, and an indexing plate is located on one side of the cam worm gear. A bearing is mounted on the indexing plate, and the bearing is coupled to the cam groove. This design utilizes the worm gear drive principle. The special worm groove shape ensures that the bearing maintains close contact at all times. Because the bearing operates in a pure rolling mode within the cam groove, friction with the groove surface is reduced, resulting in a longer service life. The bearing and turntable are connected by a thread, and there are no strict requirements on the radial height of the bearing, allowing for good coupling with the cam groove. Replacement is also very convenient. Due to the extremely low frictional resistance, high-speed rotation of the indexing plate can be achieved, further improving efficiency.

[0004] However, in the aforementioned rod changing system, the swing angle and reachable position of the rod changing system are limited for the dual rod changing system, which cannot meet the high precision requirements of the drill rod during the rod changing process. At the same time, for the multi-rod changing system, the large amount of dust generated in the borehole makes it impossible to align with visual markers, and the sensor settings are at risk of failure, resulting in low rod changing accuracy in the multi-rod changing system. Utility Model Content

[0005] 1. The problem to be solved

[0006] Therefore, it is necessary to address the problem of insufficient rod changing accuracy in existing rod changing magazine systems by providing an indexing cam rod changing magazine mechanism for roller cone drilling rigs.

[0007] 2. Technical Solution

[0008] This application provides an indexing cam rod changer mechanism for a roller cone drilling rig, comprising: a tower, a central shaft on the tower, a rod storage magazine turntable on the central shaft, a drill rod cup for accommodating drill rods on the rod storage magazine turntable, the drill rod being disposed within the accommodating cup, a drive sleeve on the tower, a threaded protrusion on the drive sleeve, and a plurality of rollers evenly distributed on the outer edge of the rod storage magazine turntable, the threaded protrusion engaging with the rollers.

[0009] In one embodiment, the tower is equipped with a hydraulic motor, the output end of the hydraulic motor is equipped with a worm gear reducer, the output end of the worm gear reducer is fitted with a coupling, and the end of the coupling away from the worm gear reducer is connected to the drive sleeve.

[0010] In one embodiment, the threaded protrusion includes a regular section and a bent section, and the drive sleeve has an arc-shaped groove for the roller to rotate. When the threaded protrusion is a regular section, the threaded protrusion abuts against the adjacent roller in the arc-shaped groove.

[0011] In one embodiment, the bent section is arranged around the drive sleeve, and when the threaded protrusion is a bent section, one end of the threaded protrusion abuts against the roller.

[0012] In one embodiment, the tower is provided with a mounting bracket, and the hydraulic motor is threadedly connected to the mounting bracket.

[0013] In one embodiment, the roller is detachably connected to the bar storage turntable.

[0014] In one embodiment, the detachable component includes: a pin, a positioning hole matching the size of the pin is provided on the storage cylinder turntable, the pin is pressed against the positioning hole, and the roller is connected to the pin.

[0015] In one embodiment, the detachable component includes a connecting bolt, the head of which is fixedly connected to a roller, and a connecting hole matching the size of the connecting bolt is provided on the storage bar turntable, the connecting bolt being threaded into the connecting hole.

[0016] In one embodiment, the roller has a retaining groove that matches the threaded head of the connecting bolt, and the threaded head of the connecting bolt abuts against the retaining groove.

[0017] In one embodiment, the bottom of the fixing groove is further provided with an adhesive layer, which is pressed between the bottom of the fixing groove and the thread head of the connecting bolt.

[0018] The aforementioned indexing cam rod changer mechanism for a roller cone drilling rig includes: a tower, a central shaft on the tower, a rod storage turntable on the central shaft, a drill rod cup on the rod storage turntable for accommodating drill rods, the drill rod being disposed within the accommodating cup, a drive sleeve on the tower, threaded protrusions on the drive sleeve, and a plurality of rollers evenly distributed on the outer edge of the rod storage turntable, the threaded protrusions meshing with the rollers.

[0019] 3. Beneficial effects

[0020] This application uses the rolling contact between the threaded protrusion on the drive sleeve and the roller of the driven turntable to achieve the indexing rotation of the rod storage magazine turntable. Compared with the large gear ring, the driven turntable is simple to manufacture, and the rollers installed on the turntable are easy to replace. At the same time, the wear gap between the roller and the cam can be eliminated by adjusting the center distance. Furthermore, the intermittent rotational motion at a fixed angle can be achieved through the design of the motion parameters and geometric dimensions of the threaded protrusion. Without the need to add alignment markers and positioning sensors, it can ensure that the drill rod reaches the rod connection position with high positioning accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the indexing cam rod changer mechanism for a roller cone drill in some embodiments of this application;

[0023] Figure 2 This is a side view of some embodiments of the present application, used to illustrate the connection relationship between the storage rod turntable and the central shaft;

[0024] Figure 3 This is a schematic diagram illustrating the working principle of the engagement between the threaded protrusion and the roller in some embodiments of this application.

[0025] Explanation of icon numbers:

[0026] 100. Tower; 200. Central shaft; 300. Bar storage turntable; 400. Container cup; 500. Drive sleeve; 600. Threaded protrusion; 610. Regular section; 620. Bending section; 700. Roller; 800. Hydraulic motor; 810. Worm gear reducer; 820. Coupling; 900. Mounting bracket. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] To address the insufficient pole-changing accuracy in existing pole-changing systems, firstly, referring to... Figure 1 This application provides an indexing cam rod changer mechanism for a roller cone drill, including a tower 100, a central shaft 200 rotatably connected to the tower 100, a rod storage turntable 300 fixedly connected to the central shaft 200, and a receiving cup 400 for receiving drill rods fixedly connected to the rod storage turntable 300, wherein the drill rods are stored in the receiving cup 400.

[0034] A drive sleeve 500 is connected to the tower 100, and a threaded protrusion 600 is fixedly connected to the drive sleeve 500. Several rollers 700 are detachably connected to the outer edge of the storage rod turntable. The rollers 700 are evenly distributed on the outer edge of the storage rod turntable, and the threaded protrusion 600 and the rollers 700 mesh with each other.

[0035] In this embodiment, the indexing rotation of the rod storage magazine turntable 300 is achieved by the rolling contact between the threaded protrusion 600 on the drive sleeve 500 and the driven turntable roller 700. Compared with the large gear ring, the driven turntable is simple to manufacture, and the roller 700 installed on the turntable is easy to replace. At the same time, the wear gap between the roller 700 and the cam can be eliminated by adjusting the center distance. Furthermore, the intermittent rotational motion at a fixed angle can be achieved through the design of the motion parameters and geometric dimensions of the threaded protrusion 600. Without the need to add alignment markers and positioning sensors, it can ensure that the drill rod reaches the rod receiving position with high positioning accuracy.

[0036] Reference Figure 1 and Figure 2As shown, in some embodiments, a hydraulic motor 800 is connected to the tower 100, and a worm gear reducer 810 is connected to the output end of the hydraulic motor 800. A coupling 820 is sleeved on the output end of the worm gear reducer, and the end of the coupling 820 away from the worm gear reducer 810 is connected to the drive sleeve 500.

[0037] The hydraulic motor 800 is connected to the worm gear reducer via a flange. The shaft of the hydraulic motor 800 drives the worm input shaft to rotate, completing the power input and deceleration motion. The drive sleeve 500 is connected to the output shaft of the worm gear reducer via a coupling 820 to achieve continuous rotation at a constant speed.

[0038] When the drive sleeve 500 needs to be rotated, the operator can drive the hydraulic motor 800 to rotate. The rotation of the hydraulic motor 800 drives the worm input shaft to rotate. The worm input shaft reduces the rotation speed of the hydraulic motor 800 proportionally through the worm gear reducer 810. Then, the output shaft of the worm gear reducer drives the drive sleeve 500 to rotate. The rotation of the drive sleeve 500 then drives the threaded protrusion 600 to rotate. The threaded protrusion 600 meshes with the roller 700, which in turn drives the storage rod magazine turntable 300 to rotate. Finally, the receiving cup 400 on the storage rod magazine turntable 300 rotates, thereby realizing the rotation of the storage rod.

[0039] Reference Figure 1 and Figure 2 As shown, in some embodiments, a mounting bracket 900 is connected to the tower 100. The position between the mounting bracket 900 and the tower 100 is relatively fixed. The connection between the tower 100 and the mounting bracket 900 can be a fixed connection or a detachable connection, as long as the tower 100 and the mounting bracket remain stable during use. In this embodiment, a fixed connection is used, and the mounting bracket 900 is set as L-shaped. The hydraulic motor 800 is threadedly connected to the mounting bracket 900, which improves the stability of the hydraulic motor 800 during the driving process.

[0040] Reference Figure 2 and Figure 3 As shown, in some embodiments, the threaded protrusion 600 includes a regular section 610 and a bent section 620. The drive sleeve 500 is provided with an arc-shaped groove, which is recessed towards the drive sleeve 500. The arc-shaped groove is used to allow the roller 700 to rotate under the drive of the threaded protrusion 600, reducing the possibility of the roller 700 hitting the drive sleeve 500 during rotation. The bent section 620 is arranged around the drive sleeve 500.

[0041] When the threaded protrusion 600 is a regular segment 610, the threaded protrusion 600 abuts against the adjacent roller 700 in the arc groove; when the threaded protrusion 600 is a bent segment 620, one end of the threaded protrusion 600 abuts against the roller 700.

[0042] Among them, the threaded protrusion 600 is a circular arc rotating body, and the cam profile is made into a ridge shape, similar to an arc-shaped worm with a variable helix angle. The arc-shaped cam can be designed as single-head, multi-head, left-handed, and right-handed according to the transmission needs. The outer edge of the bar storage turntable 300 is equipped with multiple rollers 700 with their axes evenly distributed along the radial direction of the turntable. The bar storage turntable 300 is similar to a worm gear, and the rollers 700 are equivalent to the teeth of the worm gear. The transmission process between the threaded protrusion 600 and the bar storage turntable 300 is similar to that of a worm gear transmission. The relationship between the rotation direction of the cam and the turntable can be determined in a manner similar to that of a worm gear transmission.

[0043] The transmission process is divided into an indexing motion section and a resting section. When the threaded protrusion 600 rotates, its indexing section working contour pushes the roller 700, thereby causing the turntable to index and rotate. As the arc-shaped cam rotates, the working contour of the indexing section ends engagement, and the two rollers 700 on the turntable straddle the annular ridge of the cam, causing the turntable to stop rotating.

[0044] In one embodiment, the detachable component includes: a pin, a positioning hole matching the size of the pin is provided on the storage bar turntable 300, the pin is pressed against the positioning hole, and a roller 700 is connected to the pin.

[0045] When the staff needs to replace the roller 700, they can remove the pin from the positioning hole and then remove the roller 700 from the storage bar turntable. This allows the staff to replace the roller 700 and extend the service life of the storage bar turntable by replacing the roller 700.

[0046] It is worth mentioning that the detachable parts may also include connecting bolts, the thread head of which is fixedly connected to the roller 700. The storage bar turntable 300 has a connecting hole that matches the size of the connecting bolt, and the connecting bolt is threaded into the connecting hole.

[0047] When roller 700 needs to be replaced, the operator can remove the connecting bolt from the connecting hole by turning the connecting bolt, so that roller 700 can be replaced. This allows the storage bar turntable to have its service life extended by replacing roller 700.

[0048] In one embodiment, the head of the connecting bolt is detachably connected to the roller 700. The roller 700 has a fixing groove that matches the size of the head of the connecting bolt. The connecting bolt is pressed against the fixing groove. During the disassembly of the roller 700, the operator can remove the connecting bolt from the roller 700 by pulling it out. After replacing the roller 700, the operator can press the head of the connecting bolt against the corresponding fixing groove, so that the operator can replace the roller 700 without replacing the connecting bolt.

[0049] It is worth mentioning that workers can further increase the connection stability between the connecting bolt and the roller 700 by injecting an adhesive layer into the fixing groove. This reduces the possibility that the connecting bolt may come out of the fixing groove during the rotation of the roller 700, thus increasing the stability of the meshing between the roller 700 and the threaded protrusion 600.

[0050] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rod changer mechanism for a roller cone drill rig, comprising a tower (100), a central shaft (200) mounted on the tower (100), a rod storage magazine turntable (300) mounted on the central shaft (200), a receiving cup (400) for receiving drill rods mounted on the rod storage magazine turntable (300), the drill rods being disposed within the receiving cup (400), characterized in that, The tower (100) is provided with a drive sleeve (500), the drive sleeve (500) is provided with a threaded protrusion (600), and the outer edge of the storage rod turntable (300) is provided with a plurality of rollers (700), the plurality of rollers (700) are evenly distributed on the outer edge of the storage rod turntable, and the threaded protrusion (600) and the rollers (700) mesh with each other.

2. The indexing cam rod changer mechanism for a roller cone drill according to claim 1, characterized in that, The tower (100) is equipped with a hydraulic motor (800), and the output end of the hydraulic motor (800) is equipped with a worm gear reducer (810). The output end of the worm gear reducer (810) is fitted with a coupling (820), and the end of the coupling (820) away from the worm gear reducer (810) is connected to the drive sleeve (500).

3. The indexing cam rod changer mechanism for a roller cone drill according to claim 1, characterized in that, The threaded protrusion (600) includes a regular section (610) and a bent section (620). The drive sleeve (500) has an arc-shaped groove for the roller (700) to rotate. When the threaded protrusion (600) is the regular section (610), the threaded protrusion (600) abuts against the adjacent roller (700) in the arc-shaped groove.

4. The indexing cam rod changer mechanism for a roller cone drill according to claim 3, characterized in that, The bent section (620) is arranged around the drive sleeve (500). When the threaded protrusion (600) is the bent section (620), one end of the threaded protrusion (600) abuts against the roller (700).

5. The indexing cam rod changer mechanism for a roller cone drill according to claim 2, characterized in that, The tower (100) is provided with a mounting bracket (900), and the hydraulic motor (800) is threadedly connected to the mounting bracket (900).

6. The indexing cam rod changer mechanism for a roller cone drill according to claim 1, characterized in that, The roller (700) is detachably connected to the bar storage turntable (300).

7. The indexing cam rod changer mechanism for a roller cone drill according to claim 6, characterized in that, The detachable component includes: a pin, a positioning hole matching the size of the pin is provided on the storage bar turntable (300), the pin is pressed against the positioning hole, and the roller (700) is connected to the pin.

8. The indexing cam rod changer mechanism for a roller cone drill according to claim 6, characterized in that, The detachable component includes: a connecting bolt, the head of which is fixedly connected to a roller (700), and a connecting hole matching the size of the connecting bolt is provided on the storage bar turntable (300), the connecting bolt being threaded into the connecting hole.

9. The indexing cam rod changer mechanism for a roller cone drill according to claim 8, characterized in that, The roller (700) has a fixing groove that matches the threaded head of the connecting bolt, and the threaded head of the connecting bolt is pressed against the fixing groove.

10. The indexing cam rod changer mechanism for a roller cone drill according to claim 9, characterized in that, The bottom of the fixing groove is also provided with an adhesive layer, which is pressed between the bottom of the fixing groove and the screw head of the connecting bolt.

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