Rotation test device for rock drill

Abstract

A rock drill rotation test device comprises a test bench, the test bench is provided with a driving assembly used for driving a drill shank of a rock drill to rotate and a loading assembly used for applying load to the drill shank, the loading assembly comprises a loading shaft and a threaded sleeve which are coaxial with the drill shank, and one end of the loading shaft is provided with a loading motor; the other end of the loading shaft extends into the threaded sleeve and is fixedly connected with the threaded sleeve, and the free end of the bit shank extends into the threaded sleeve and drives the threaded sleeve to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of rock drill rotation test devices, in particular to a rock drill rotation test device. Background Art

[0002] Hydraulic rock drills are percussive-rotary drilling tools powered by high-pressure liquid. They feature high energy efficiency, fast drilling speeds, and excellent mechanical properties, making them widely used in mining, transportation, tunneling, and railway construction. Existing hydraulic rock drills utilize an independent external slewing mechanism, with a separate hydraulic motor driving a transmission system to rotate the drill bit. The hydraulic motor's parameters are used to evaluate the drill's slewing performance. However, slewing mechanisms vary in part machining and assembly precision, as well as component cleanliness. Therefore, using only the hydraulic motor's performance parameters to characterize the slewing performance of a hydraulic rock drill is inaccurate. Therefore, a rock drill slewing test device is needed. Utility Model Content

[0003] The purpose of the utility model is to provide a rock drill rotation test device, which can accurately test the rotation performance and reduce the test cost.

[0004] In order to achieve the above-mentioned purpose, the specific scheme adopted by the utility model is: a rock drill rotation test device, including a test bench, on which is provided a drive assembly for driving the rock drill tail to rotate and a loading assembly for applying a load to the tail, characterized in that: the loading assembly includes a loading shaft and a threaded sleeve coaxial with the tail, the free end of the tail extends into the threaded sleeve and cooperates with the internal thread of the threaded sleeve; one end of the loading shaft is provided with a loading motor for driving the rotation thereof, the other end of the loading shaft extends into the threaded sleeve and drives the threaded sleeve to rotate synchronously, so that the rotation speed of the threaded sleeve matches the rotation speed of the tail.

[0005] As an optimization solution of the above-mentioned rock drill rotation test device: the drive assembly includes a coaxially arranged first transmission shaft and a second transmission shaft, the second transmission shaft is located in the rock drill housing and has a coaxial mounting hole at one end, and the other end of the second transmission shaft is connected to the drill tail for transmission; one end of the first transmission shaft is provided with a drive motor for driving it to rotate, and the other end of the first transmission shaft extends into the mounting hole and is connected through a spline transmission.

[0006] As another optimization solution of the above-mentioned rock drill rotation test device: the end of the first transmission shaft away from the second transmission shaft is fixedly connected to a first connecting flange, and the drive shaft of the drive motor is fixedly provided with a second connecting flange fixedly connected to the first connecting flange.

[0007] As another optimization scheme of the above-mentioned rock drill rotation test device: the box body is fixedly provided with a bearing seat, a first gap is formed between the inner wall of the bearing seat and the outer wall of the first transmission shaft, and the bearing seat and the first transmission shaft are connected through first bearings arranged at both ends of the first gap.

[0008] As another optimization scheme of the above-mentioned rock drill rotation test device: the end of the bearing seat close to the box body is bent toward its center to form an annular bending portion, the inner side wall of the annular bending portion is sealed with the outer side wall of the first transmission shaft, and an end cover is provided at the end of the bearing seat away from the box body, so that the end cover, the bearing seat and the annular bending portion enclose a closed lubrication cavity.

[0009] As another optimization solution of the above-mentioned rock drill rotation test device: the side wall of the bearing seat is provided with an oil supply nozzle for supplying oil to the lubrication cavity.

[0010] As another optimization solution of the above-mentioned rock drill rotation test device: the motor shaft of the loading motor is coaxially fixedly connected to the third connecting flange, and one end of the loading shaft is fixedly connected to the third connecting flange.

[0011] As another optimization solution of the above-mentioned rock drill rotation test device: the outer wall of the threaded sleeve is provided with a connecting ring mounted on the test bench, and the connecting ring is connected to the threaded sleeve through a second bearing.

[0012] As another optimization solution for the above-mentioned rock drill rotation test device: a support rod is arranged between the connecting ring and the test bench, the top end of the support rod is fixedly connected to the outer wall of the connecting ring, and the bottom end of the support rod is fixedly connected to the test bench.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model provides a rock drill rotation test device, wherein a driving motor drives a first transmission shaft to rotate, drives a second transmission shaft to rotate, and finally drives a drill tail to rotate, so as to perform a no-load test on the rock drill. The rock drill is in a loaded state when working. Therefore, a loading assembly is provided at the tail of the drill tail, and the drill tail is connected to the loading motor through a threaded sleeve and a loading shaft. The driving motor drives the drill tail to rotate, drives the threaded sleeve to rotate, and further drives the motor shaft of the loading motor to rotate. During this process, the drill tail is subjected to torque when driving the motor shaft to rotate, that is, the loading motor applies a load to the drill tail, and the threaded sleeve and the loading shaft realize torque transmission, so that the rotation performance test result is accurate and the test cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2It is a structural diagram of the drive assembly in the utility model;

[0017] Figure markings: 1. housing, 102. second transmission shaft, 2. shank, 201. threaded section, 3. first transmission shaft, 301. spline section, 302. first connecting flange, 4. drive motor, 401. drive shaft, 402. second connecting flange, 5. bearing seat, 501. first bearing, 502. oil supply nozzle, 503. annular bending portion, 504. first sealing member, 6. end cover, 601. second sealing member, 7. lubrication chamber, 8. loading shaft, 9. threaded sleeve, 901. connecting ring, 902. second bearing, 903. support rod, 10. loading motor, 1001. motor shaft, 1002. third connecting flange. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be further elaborated below in conjunction with specific embodiments. Parts not described and disclosed in detail in the following embodiments of the present invention should be understood as existing technologies known or should be known to those skilled in the art, such as how the second transmission shaft 102 is connected to the shank 2 for transmission.

[0019] Example

[0020] A rock drill rotation test device includes a test bench (not shown) equipped with a drive assembly for rotating the rock drill adapter 2 and a loading assembly for applying a load to the adapter 2. The drive assembly rotates the adapter 2, while the loading assembly applies a load to the adapter 2, making the force applied to the adapter 2 during the rotation test closer to its actual operating conditions, thereby improving the accuracy of the test results. Specifically, the loading assembly includes a loading shaft 8 and a threaded sleeve 9 coaxial with the adapter 2. One end of the adapter 2 is connected to the housing 1 of the rock drill, and the other end of the adapter 2 extends out of the housing 1 and has a threaded section 201. A loading motor 10 is provided at one end of the loading shaft 8. The base of the loading motor 10 is fixed to the test bench. The motor shaft 1001 of the loading motor 10 is coaxially fixedly connected to the loading shaft 8. Specifically, the free end of the motor shaft 1001 is coaxially fixedly connected to a third connecting flange 1002, and the connection between the motor shaft 1001 and the third connecting flange 1002 is a key connection. A connecting ring 901 is integrally connected to the outer wall of the end of the loading shaft 8. The connecting ring 901 is fixedly connected to the third connecting flange 1002, and the two are connected by bolts. The other end of the loading shaft 8 extends into the threaded sleeve 9 and is fixedly connected to the threaded sleeve 9. The two are connected by a threaded connection. The threaded sleeve 9 is a circular cylindrical structure. The outer diameter of the threaded sleeve 9 is larger than the diameter of the shank 2, and the inner diameter of the threaded sleeve 9 is equal to the diameter of the shank 2. The inner side wall of the threaded sleeve 9 is provided with an internal thread that matches the threaded section 201 of the shank 2. The free end of the shank 2 extends into the threaded sleeve 9 and matches with the internal thread of the threaded sleeve 9, that is, a fixed connection between the shank 2 and the threaded sleeve 9 is achieved. A loading assembly is provided at the tail of the shank 2. The shank 2 is connected to the loading motor 10 through the threaded sleeve 9 and the loading shaft 8. The driving motor 10 drives the shank 2 to rotate, driving the threaded sleeve 9 to rotate, and then driving the motor shaft 8 of the loading motor 10 to rotate. During this process, the shank 2 is subjected to torque when driving the motor shaft 8 to rotate, that is, the loading motor 10 applies a load to the shank 2, and the threaded sleeve 9 and the loading shaft 8 achieve torque transmission, so that the rotation performance test results are accurate and the test cost is reduced.

[0021] The outer wall of the threaded sleeve 9 is provided with a connecting ring 901 mounted on the test bench. The inner diameter of the connecting ring 901 is larger than the outer diameter of the threaded sleeve 9 and the connecting ring 901 is coaxial with the threaded sleeve 9. The connecting ring 901 and the threaded sleeve 9 are connected via a second bearing 902. A support rod 903 is provided between the connecting ring 901 and the test bench. The top end of the support rod 903 is fixedly connected to the outer wall of the connecting ring 901 and the connection between the support rod 903 and the outer wall of the connecting ring 901 is welded. The bottom end of the support rod 903 is fixedly connected to the test bench and the connection between the support rod 903 and the test bench is bolted. The arrangement of the support rod 903 and the connecting ring 901 reduces the runout of the threaded sleeve 9 and ensures load transfer.

[0022] The drive assembly includes a coaxially arranged first transmission shaft 3 and a second transmission shaft 102. The second transmission shaft 102 is located within the rock drill housing 1 and has a coaxial mounting hole at one end. The mounting hole is located at the end of the second transmission shaft 102 facing the first transmission shaft 3. The mounting hole is a blind hole, coaxial with the second transmission shaft 102, and has a splined hole. The other end of the second transmission shaft 102 is drivingly connected to the drill adapter 2. A drive motor 4 is provided at one end of the first transmission shaft 3 to drive its rotation. The other end of the first transmission shaft 3 extends into the mounting hole and is connected via a spline. The end of the first transmission shaft 3 near the second transmission shaft 102 has a spline section 301 that mates with the mounting hole, establishing a splined connection between the first transmission shaft 3 and the second transmission shaft 102.

[0023] The drive motor 4 is in transmission connection with one end of the first transmission shaft 3 facing away from the second transmission shaft 102. Specifically, the drive shaft 401 of the drive motor 4 is fixedly provided with a second connecting flange 402, and the second connecting flange 402 is key-connected to the drive shaft 401. The outer side wall of the end of the first transmission shaft 3 facing away from the second transmission shaft 102 is fixedly connected with the first connecting flange 302, and the connection method of the first connecting flange 302 and the first transmission shaft 3 is a key connection; the first connecting flange 302 is fixedly connected to the second connecting flange 402, and the connection method of the two is a bolt connection, thereby realizing the transmission connection between the drive shaft 401 and the first transmission shaft 3.

[0024] The first transmission shaft 3 is connected to the rock drill housing 1 by a bearing seat 5 fixedly mounted on the housing 1. The bearing seat 5 and the housing 1 can be connected by welding or bolts. In this embodiment, the bearing seat 5 and the housing 1 are connected by bolts to facilitate assembly and disassembly of the bearing seat 5. The bearing seat 5 is sleeved on the first transmission shaft 3, and a first gap is formed between the inner sidewall of the bearing seat 5 and the outer sidewall of the first transmission shaft 3. The bearing seat 5 and the first transmission shaft 3 are connected by first bearings 501 disposed at both ends of the first gap.

[0025] During the rotation test, the first bearing 501 is lubricated with grease to prevent the grease from flowing out. The end of the bearing seat 5 close to the housing 1 is bent toward its center to form an annular bending portion 503. The inner wall of the annular bending portion 503 is sealed with the outer wall of the first transmission shaft 3. Specifically, the connection between the annular bending portion 503 and the inner wall of the bearing seat 5 can be an integral connection, welding or bolt connection. In this embodiment, the connection between the two is an integral connection. A first sealing member 504 is provided between the inner wall of the annular bending portion 503 and the outer wall of the first transmission shaft 3 to prevent the grease from flowing out from the right end of the bearing seat 5. An end cover 6 is provided at the end of the bearing seat 5 away from the housing 1. The end cover 6 is connected to the end of the bearing seat 5 by bolts. A through hole is provided on the end cover 6 for the first transmission shaft 3 to pass through. A second sealing member 601 is provided between the inner wall of the through hole and the outer wall of the first transmission shaft 3, so that the end cover 6, the bearing seat 5 and the annular bent portion are enclosed to form a closed lubrication cavity 7. An oil supply nozzle 502 for supplying oil to the lubrication cavity 7 is provided on the side wall of the bearing seat 5. The lubricating oil of the first bearing 501 is only in the lubrication cavity 7 and will not flow out.

[0026] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rock drill rotation test device, comprising a test bench, wherein the test bench is provided with a drive assembly for driving a rock drill tail (2) to rotate and a loading assembly for applying a load to the tail (2), wherein: The loading assembly comprises a loading shaft (8) and a threaded sleeve (9) coaxial with the shank tail (2); a loading motor (10) is provided at one end of the loading shaft (8); the other end of the loading shaft (8) extends into the threaded sleeve (9) and is fixedly connected to the threaded sleeve (9); the free end of the shank tail (2) extends into the threaded sleeve (9) and drives the threaded sleeve (9) to rotate.

2. A rock drill rotation test device according to claim 1, characterized in that: The drive assembly comprises a first transmission shaft (3) and a second transmission shaft (102) which are coaxially arranged. The second transmission shaft (102) is located in the rock drill housing (1) and has a mounting hole coaxially opened at one end. The other end of the second transmission shaft (102) is transmission-connected to the drill tail (2). A drive motor (4) for driving the first transmission shaft (3) is provided at one end. The other end of the first transmission shaft (3) extends into the mounting hole and is transmission-connected via a spline.

3. A rock drill rotation test device according to claim 2, characterized in that: One end of the first transmission shaft (3) away from the second transmission shaft (102) is fixedly connected to a first connecting flange (302), and the driving shaft (401) of the driving motor (4) is fixedly provided with a second connecting flange (402) fixedly connected to the first connecting flange (302).

4. A rock drill rotation test device according to claim 2, characterized in that: The housing (1) is fixedly provided with a bearing seat (5), a first gap is formed between the inner side wall of the bearing seat (5) and the outer side wall of the first transmission shaft (3), and the bearing seat (5) and the first transmission shaft (3) are connected via first bearings (501) provided at both ends of the first gap.

5. A rock drill rotation test device according to claim 4, characterized in that: The end of the bearing seat (5) close to the housing (1) is bent toward the center thereof to form an annular bent portion (503), the inner side wall of the annular bent portion (503) is sealedly connected to the outer side wall of the first transmission shaft (3), and an end cover (6) is provided at the end of the bearing seat (5) away from the housing (1), so that the end cover (6), the bearing seat (5) and the annular bent portion (503) enclose and form a closed lubrication cavity (7).

6. A rock drill rotation test device according to claim 5, characterized in that: The side wall of the bearing seat (5) is provided with an oil supply nozzle (502) for supplying oil into the lubrication cavity (7).

7. A rock drill rotation test device according to claim 1, characterized in that: The motor shaft (1001) of the loading motor (10) is coaxially fixedly connected to a third connecting flange (1002), and one end of the loading shaft (8) is fixedly connected to the third connecting flange (1002).

8. The rock drill rotation test device according to claim 1, characterized in that: The outer wall of the threaded sleeve (9) is provided with a connecting ring (901) mounted on the test bench, and the connecting ring (901) is connected to the threaded sleeve (9) via a second bearing (902).

9. A rock drill rotation test device according to claim 8, characterized in that: A support rod (903) is provided between the connecting ring (901) and the test bench. The top end of the support rod (903) is fixedly connected to the outer wall of the connecting ring (901), and the bottom end of the support rod (903) is fixedly connected to the test bench.

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