Rock drill opening device

Abstract

The utility model provides a rock drill opening device belongs to rock drill opening device technical field, including the blow shaft and the drill rod, the blow shaft's front end integral moulding has the adapter rear end, the drill rod's rear end is installed with the adapter front end, be equipped with fastening parts between the adapter rear end and the adapter front end. The utility model solves the problem of the prior art under high frequency vibration, easy to loosen, power transmission interruption, the taper surface will be directly contacted and easy to wear, resulting in the problem of the matching precision decline, the utility model provides a rock drill opening device, realizes the contact area increase, is not easy to loosen, and greatly reduces the problem of wear and tear.

Description

Technical Field

[0001] This utility model belongs to the technical field of rock drill opening devices, specifically a rock drill opening device. Background Technology

[0002] A blast furnace rock drill is a type of furnace tapping machine, one of the main process equipment in furnace operations. Its primary function is to open the taphole during blast furnace tapping, breaking through the refractory mud blocking the taphole and drilling out a 65mm diameter opening to discharge molten iron. As a crucial part of the tapping machine, the rock drill primarily performs the rotation and impact functions of the drill rod. The temperature at the taphole is approximately 350 degrees Celsius, making the working environment harsh. The front and rear connections of the rock drill's adapter are prone to loosening, the spring between the drill rod and the adapter's front end is prone to breakage, and the threaded connection between the adapter's rear end and the impact shaft is easily damaged. Frequent maintenance of the rock drill severely impacts its service life and affects the overall production schedule.

[0003] CN219907733U discloses a rock drill for use in blast furnaces. The rock drill uses a single conical or flat mating joint during the connection process, which has a small contact area. Under high-frequency vibration, it is easy to loosen and interrupt power transmission. At the same time, when used at high temperatures for a long time, the conical surface will wear due to direct contact under the thermal expansion and contraction of metal, resulting in a decrease in the fitting accuracy.

[0004] In summary, existing technologies suffer from problems such as easy loosening under high-frequency vibration, interruption of power transmission, and easy wear of the conical surface due to direct contact, leading to a decrease in fitting accuracy. This invention provides a rock drill opening device that increases the contact area, prevents loosening, and greatly reduces wear. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given the following technical problems in the existing technology: how to design a rock drill opening device that increases the contact area, is not easy to loosen, and greatly reduces wear.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a rock drill opening device, including a striking shaft and a drill rod, wherein the front end of the striking shaft is integrally formed with an adapter rear end, the rear end of the drill rod is installed with an adapter front end, and a fastening component is provided between the adapter rear end and the adapter front end.

[0008] As a preferred technical solution for the opening device of a rock drill, the diameter of the cylinder wall at the rear end of the adapter is larger than the diameter of the striking shaft. The end of the rear end of the adapter is provided with a plug connector. A plug block is integrally formed on the cylinder wall behind the plug connector. A mating groove is reserved on the side of the plug block facing the front end of the adapter. A tapered groove is reserved on the side of the plug connector facing the front end of the adapter.

[0009] As a preferred technical solution for the opening device of a rock drill, a connector is fixed on the front end of the adapter facing the rear end of the adapter cylinder wall. The connector is adapted to the mating groove. The inner cylinder of the connector has a pre-reserved insertion groove. The insertion groove is adapted to the insertion connector. A cone is fixed on the peripheral wall of the insertion groove. The cone is adapted to the cone groove.

[0010] As a preferred technical solution for the opening device of a rock drill, the front end of the adapter near the drill rod is integrally formed with a connecting block, and the connecting block and the plug-in block are connected by bolts.

[0011] As a preferred technical solution for the opening device of a rock drill, the peripheral wall of the cone head is integrally formed with reinforcing ribs, and the inner wall of the cone groove is provided with a corresponding reinforcing rib groove, with the reinforcing ribs corresponding to the reinforcing rib grooves.

[0012] As a preferred technical solution for the opening device of a rock drill, the fastening component includes a bushing installed between the cone head and the cone groove. The bushing has the same shape as the cone head, the surface of the bushing is provided with a through strip, and a rubber pad is fixed on the inner wall surface of the bushing.

[0013] As a preferred technical solution for the rock drill opening device, the inner wall surface of the front end of the adapter away from the rear end of the adapter is provided with an annular mounting cavity, and multiple sets of disc springs are arranged in annular arrangement inside the annular mounting cavity, with each set of disc springs arranged in pairs opposite each other.

[0014] As a preferred technical solution for the rock drill opening device, the drill rod is provided with an arc-shaped step at one end inserted into the rear end of the adapter.

[0015] The beneficial effects of this utility model are:

[0016] 1. By setting the rear end and front end of the adapter, the drill rod and the impact shaft can be connected in multiple dimensions through the front end and rear end of the adapter, which greatly improves the overall fastening ability and avoids loosening under long-term high temperature use.

[0017] 2. By using a bushing, the cone head and cone surface are more securely fitted under the bushing, improving the fit between the cone head and the cone groove, increasing friction, preventing displacement and loosening of the cone head and cone groove under long-term vibration, and improving the overall sealing performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic cross-sectional view of an embodiment of the present utility model;

[0020] Figure 2 This is a front view of the adapter rear end structure according to an embodiment of the present invention;

[0021] Figure 3 This is a front view of the adapter front end structure according to an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the bushing structure according to an embodiment of the present utility model;

[0023] Reference numerals: 100, striking shaft; 200, drill pipe; 300, adapter rear end; 301, connector; 302, connector block; 303, mating groove; 304, tapered groove; 400, adapter front end; 401, butt joint; 402, connector groove; 403, cone head; 404, connecting block; 405, reinforcing rib; 406, reinforcing rib groove; 407, bushing; 408, through strip; 409, annular mounting cavity; 410, disc spring. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0028] Example 1

[0029] Reference Figures 1-4 This embodiment provides a rock drill opening device, including a striking shaft 100 and a drill rod 200. The front end of the striking shaft 100 is integrally formed with an adapter rear end 300, and the rear end of the drill rod 200 is installed with an adapter front end 400. A fastening component is provided between the adapter rear end 300 and the adapter front end 400.

[0030] Specifically, the impact shaft 100 and drill pipe 200 are used. The impact shaft 100, as the core power transmission component, is responsible for transmitting the rotational torque and impact kinetic energy of the external hydraulic motor to the subsequent working structure. Its material is high-temperature resistant GH4169 alloy, ensuring sufficient strength and toughness even in high-temperature environments. The front end of the impact shaft 100 has an integrated adapter rear end 300. This integrated structure avoids the stress concentration problems that easily occur with traditional separate welding or threaded connections, significantly improving the connection strength between the impact shaft 100 and the adapter rear end 300, and reducing energy loss during power transmission. The drill pipe 200 serves as the direct actuator... The components for rock drilling operations are equipped with a carbide drill bit at the front end that is adapted to the refractory mud penetration requirements of blast furnaces, and an adapter front end 400 at the rear end. The connection between the adapter front end 400 and the drill rod 200 adopts a high-precision transition fit, which not only ensures the coaxiality of the drill rod 200 during rotation and avoids drilling deviation, but also facilitates quick replacement of the drill rod 200 after wear. A fastening component is provided between the adapter rear end 300 and the adapter front end 400. This fastening component not only enhances the sealing of the connection between the two to prevent high-temperature dust and coolant from entering the connection gap, but also compensates for the thermal expansion difference of metal components at high temperatures, preventing the fit from jamming or loosening.

[0031] The diameter of the cylindrical wall of the adapter rear end 300 is larger than the diameter of the striking shaft 100. The end of the adapter rear end 300 is provided with a connector 301. A connector block 302 is integrally formed on the cylindrical wall behind the connector 301. A mating groove 303 is reserved on the side of the connector block 302 facing the front end 400 of the adapter. A conical groove 304 is reserved on the side of the connector 301 facing the front end 400 of the adapter.

[0032] Specifically, the diameter of the cylindrical wall of the adapter rear end 300 is larger than the diameter of the impact shaft 100. This larger diameter design provides ample installation space for subsequent multiple docking structures and increases the radial bearing area of ​​the adapter rear end 300, making it less prone to radial deformation under high-frequency impacts. The end of the adapter rear end 300 is equipped with a connector 301, which ensures no significant gap when fitting with the adapter structure, reducing wear caused by vibration. An integrally formed insertion block 302 is formed on the cylindrical wall behind the connector 301. The insertion block 302 is not only a structural reinforcement of the adapter rear end 300... The reinforcing component enhances the torsional resistance of the cylinder wall and serves as a preliminary positioning reference during docking, guiding the adapter front end 400 to accurately dock. The plug block 302 has a docking groove 303 reserved on the side facing the adapter front end 400. The inner wall of the docking groove 303 is provided with a guide slope, which can reduce the alignment difficulty during docking, allowing the connector 401 to be smoothly inserted and improving assembly efficiency. The plug 301 has a conical groove 304 reserved on the side facing the adapter front end 400. The conical groove 304 can fit tightly with the cone head 403 to achieve uniform power transmission, and the self-locking characteristic of the conical surface can reduce the risk of loosening caused by vibration.

[0033] A connector 401 is fixed on the cylindrical wall of the adapter front end 400 facing the adapter rear end 300. The connector 401 is adapted to the mating groove 303. The inner cylinder of the connector 401 has a pre-reserved insertion groove 402, which is adapted to the insertion joint 301. A cone 403 is fixed on the peripheral wall of the insertion groove 402, which is adapted to the cone groove 304.

[0034] Specifically, a connector 401 is fixed on the cylindrical wall of the adapter front end 400 facing the adapter rear end 300. The connector 401 is adapted to the mating groove 303. The two work together to achieve radial positioning of the adapter front end 400 and the adapter rear end 300. The inner cylinder of the connector 401 has a pre-reserved insertion groove 402. The depth of the insertion groove 402 matches the length of the insertion groove 301 to ensure that the insertion groove 301 can fit completely after insertion, avoiding stress concentration caused by local suspension. A cone 403 is fixed on the peripheral wall of the insertion groove 402. The cone 403 is adapted to the cone groove 304 to reduce component wear.

[0035] The adapter front end 400 near the drill rod 200 has an integrally formed connecting block 404, which is connected to the plug block 302 by bolts.

[0036] Specifically, the adapter front end 400 near the drill rod 200 has an integrally formed connecting block 404. The integrally formed structure of the connecting block 404 and the adapter front end 400 ensures that it has sufficient load-bearing strength to withstand the pre-tightening force when the bolt is tightened. The connecting block 404 and the plug block 302 are connected by bolts, and the bolt head is provided with an anti-loosening washer to further enhance the anti-loosening effect.

[0037] The peripheral wall of the cone head 403 is integrally formed with reinforcing ribs 405, and the inner wall of the cone groove 304 is provided with corresponding reinforcing rib grooves 406, with the reinforcing ribs 405 and reinforcing rib grooves 406 corresponding to each other.

[0038] Specifically, the peripheral wall of the cone head 403 is integrally formed with reinforcing ribs 405. Multiple reinforcing ribs 405 are evenly distributed along the axial direction of the cone head 403, which can significantly improve the torsional strength and bending resistance of the cone head 403 and prevent the cone head 403 from breaking when subjected to large torque. The inner wall of the cone groove 304 is provided with a corresponding reinforcing rib groove 406. The size of the reinforcing rib groove 406 is perfectly matched with the reinforcing rib 405. The corresponding cooperation between the reinforcing rib 405 and the reinforcing rib groove 406 can not only further restrict the relative rotation between the cone head 403 and the cone groove 304 to ensure that the power transmission is non-slip, but also serve as a guide structure during docking to improve the accuracy of the cone surface docking.

[0039] The fastening components include a bushing 407 installed between the cone head 403 and the cone groove 304. The bushing 407 has the same shape as the cone head 403. A through strip 408 is provided on the surface of the bushing 407. A rubber pad is fixed on the inner wall of the bushing 407.

[0040] Specifically, the fastening components include a bushing 407 installed between the cone head 403 and the conical groove 304. The bushing 407 is made of high-temperature alloy material, which can maintain stable elasticity and strength within a certain temperature range and avoid softening failure at high temperatures. The bushing 407 has the same shape as the cone head 403, ensuring that it can completely fit the surfaces of the cone head 403 and the conical groove 304, evenly distributing the contact pressure of the conical surface and reducing local wear. The surface of the bushing 407 is provided with a through strip 408, which is arranged along the axial direction of the bushing 407, allowing the bushing 407 to have a certain elastic expansion and contraction capacity. In high-temperature environments, it can compensate for the thermal expansion difference between the cone head 403 and the conical groove 304 and prevent jamming. A rubber pad is fixed on the inner wall of the bushing 407. The rubber pad is made of high-temperature resistant fluororubber material, which not only enhances the friction between the bushing 407 and the cone head 403 and prevents the bushing 407 from shifting during vibration, but also further improves the sealing performance of the conical surface fit and prevents fine dust from entering.

[0041] An annular cavity 409 is provided on the inner wall surface of the front end 400 of the adapter away from the rear end 300 of the adapter. Multiple sets of disc springs 410 are arranged in annular arrangement inside the annular cavity 409, with each set of disc springs 410 arranged in pairs opposite each other.

[0042] Specifically, an annular mounting cavity 409 is provided on the inner wall of the adapter front end 400 away from the adapter rear end 300. The depth of the annular mounting cavity 409 is adapted to the thickness of the disc spring 410 to ensure that the disc spring 410 does not move axially after installation. Multiple sets of disc springs 410 are arranged in annular arrangement inside the annular mounting cavity 409. Each set of disc springs 410 is arranged in pairs opposite each other. This reverse superposition structure can greatly improve the load-bearing capacity of the disc springs 410, and at the same time have better buffering and shock absorption performance. It can effectively absorb the high-frequency vibration of the drill rod 200 when drilling rock and reduce the impact of vibration on the connection between the adapter front end 400 and the drill rod 200.

[0043] The drill rod 200 has an arc-shaped step at one end that is inserted into the rear end 300 of the adapter.

[0044] Specifically, the end of the drill rod 200 that is inserted into the rear end 300 of the adapter has an arc-shaped step. The arc-shaped step is smoothly transitioned to avoid stress concentration points and prevent the drill rod 200 from breaking due to excessive local stress during insertion or under force. At the same time, the arc-shaped step can also form an axial limit with the inner wall of the front end 400 of the adapter, limiting the maximum insertion depth of the drill rod 200 and ensuring accurate mating position between the drill rod 200 and the front end 400 of the adapter. In addition, the arc-shaped step can increase the contact area between the drill rod 200 and the front end 400 of the adapter, improve power transmission efficiency, reduce local wear, and also allow the drill rod 200 to be smoothly inserted into the middle of the disc spring 410, generating an outward compressive force on the disc spring 410.

[0045] Working Principle: During device assembly, the front end 400 and rear end 300 of the adapter are precisely aligned. The alignment process uses the reinforcing rib 405 and reinforcing rib groove 406 as guiding references to ensure the connector 301 is smoothly inserted into the connector groove 402. Simultaneously, the connector 401 and the mating groove 303 are radially positioned and aligned, while the conical head 403 is correspondingly inserted into the conical groove 304. A bushing 407 is pre-placed at the mating point of the conical head 403 and the conical groove 304. The bushing 407 is fitted onto the outer surface of the conical head 403, and its surface through strip 408 supports a slight expansion of the bushing 407 during the alignment process, ensuring that the bushing 407 completely fits the surfaces of the conical head 403 and the conical groove 304 for a tight fit. After all the alignment structures are in place, the connector 302 and the connecting rod are connected by bolts. Connector 404 is used for connection and fixation. After the bolts are tightened, anti-loosening washers are used to ensure that it will not loosen under high temperature and vibration environment. Then, drill rod 200 is inserted into the interior of adapter front end 400 from the end away from adapter rear end 300. When drill rod 200 is inserted, the arc-shaped step at its end will contact disc spring 410 in annular mounting cavity 409, and as the insertion depth increases, it will compress disc spring 410. After being compressed, disc spring 410 generates elastic force, providing continuous axial preload for drill rod 200. At the same time, the interface between drill rod 200 and adapter front end 400 is also reinforced by keyway and gasket. Keyway fits to restrict the relative rotation of the two, and gasket enhances the sealing and anti-loosening effect. Double protection prevents drill rod 200 from axial slippage during operation.

[0046] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rock drill opening device, characterized in that: It includes a striking shaft (100) and a drill rod (200). The front end of the striking shaft (100) is integrally formed with an adapter rear end (300), and the rear end of the drill rod (200) is installed with an adapter front end (400). A fastening component is provided between the adapter rear end (300) and the adapter front end (400).

2. A rock drill opening device according to claim 1, characterized in that: The diameter of the cylindrical wall of the rear end (300) of the adapter is larger than the diameter of the striking shaft (100). The end of the rear end (300) of the adapter is provided with a connector (301). A plug block (302) is integrally formed on the cylindrical wall behind the connector (301). The plug block (302) has a mating groove (303) reserved on the side facing the front end (400) of the adapter. The connector (301) has a tapered groove (304) reserved on the side facing the front end (400) of the adapter.

3. A rock drill opening device according to claim 2, characterized in that: A connector (401) is fixed on the cylindrical wall of the front end (400) of the adapter facing the rear end (300). The connector (401) is adapted to the mating groove (303). The inner cylinder of the connector (401) has a pre-reserved insertion groove (402). The insertion groove (402) is adapted to the insertion joint (301). A cone (403) is fixed on the peripheral wall of the insertion groove (402). The cone (403) is adapted to the cone groove (304).

4. A rock drill opening device according to claim 3, characterized in that: The adapter front end (400) near the drill rod (200) has an integrally formed connecting block (404), which is connected to the plug block (302) by bolts.

5. A rock drill opening device according to claim 4, characterized in that: The peripheral wall of the cone (403) is integrally formed with reinforcing ribs (405), and the inner wall of the cone groove (304) is provided with a corresponding reinforcing rib groove (406), with the reinforcing ribs (405) corresponding to the reinforcing rib grooves (406).

6. A rock drill opening device according to claim 5, characterized in that: The fastening component includes a bushing (407) installed between the cone head (403) and the cone groove (304). The bushing (407) has the same shape as the cone head (403). A through strip (408) is provided on the surface of the bushing (407). A rubber pad is fixed on the inner wall of the bushing (407).

7. A rock drill opening device according to claim 6, characterized in that: The inner wall surface of the front end (400) of the adapter away from the rear end (300) of the adapter is provided with an annular mounting cavity (409). Multiple sets of disc springs (410) are arranged in annular arrangement inside the annular mounting cavity (409), and each set of disc springs (410) is arranged in pairs opposite to each other.

8. A rock drill opening device according to claim 7, characterized in that: The drill rod (200) has an arc-shaped step at one end where it is inserted into the rear end (300) of the adapter.

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