Torque loading device

Abstract

The present application relates to rock drill technical field, specifically to a torque loading device, the device includes a rotating shaft, chuck, gear box, oil and gas joint, speed sensor and hydraulic motor; the rotating shaft is sequentially provided with a rock drill connecting section, a spline section and a load connecting section along its axial direction; the chuck is sleeved on the spline section; the rotating shaft can drive the chuck to rotate, and the rotating shaft can slide axially in the chuck; the main shaft of the gear box is coaxially connected with the chuck; the load connecting section penetrates the gear box; the speed sensor and the hydraulic motor are correspondingly installed on the gear box; the speed sensor can detect the number of gear teeth passing through per unit time; the hydraulic motor can load the rotating torque of the gear box; the oil and gas joint is installed on the gear box; the chuck and the gear box are connected with an oil and gas passage; one end of the oil and gas passage is communicated with the oil and gas joint, and the other end is communicated to the outer wall of the spline section. The lubricating oil and gas reduces the damage caused by insufficient lubrication during the axial movement of the rotating shaft.

Description

Technical Field

[0001] This invention relates to the field of rock drill technology, and more specifically to a torque loading device. Background Technology

[0002] Accurate and efficient rotational performance testing devices are of great significance to the research, development, and manufacturing of rock drills. They facilitate the optimization of design schemes and quality control during the production process, thereby improving the overall level of rock drill research and manufacturing. Currently, in the rotational performance testing of rock drills, torque loading devices are used to measure the output torque and speed of the rock drill under test, and to analyze the rotational energy consumed by the rock drill.

[0003] Currently, most rock drill torque loading devices use magnetic powder brakes or hydraulic throttling for loading. However, using magnetic powder brakes as a rotary load cannot withstand the axial impact of the rock drill, requiring separate rotary and impact tests, resulting in low testing efficiency. Hydraulic throttling allows for simultaneous rotary and impact tests, but the rotary load device's central shaft must withstand significant impact force and axial movement, making the load device prone to damage and requiring frequent maintenance and replacement, further reducing testing efficiency. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a torque loading device, which solves the technical problem that the existing torque loading devices have poor adaptability to axial movement, resulting in low efficiency in rotational performance testing.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the torque loading device of the present invention includes a rotary shaft, a chuck, a gearbox, an oil-gas connector, a speed sensor, and a hydraulic motor.

[0008] The rotary shaft is provided with a rock drill connecting section, a spline section and a load connecting section in sequence along its axial direction; the chuck is sleeved on the spline section; the rotary shaft can drive the chuck to rotate, and the rotary shaft can slide axially within the chuck; the main shaft of the gearbox is coaxially connected to the chuck; the load connecting section passes through the gearbox;

[0009] The speed sensor and the hydraulic motor are respectively mounted on the gearbox; the speed sensor can detect the number of gear teeth passing by per unit time; the hydraulic motor can apply the rotational torque of the gearbox;

[0010] The oil-gas connector is installed on the gearbox; the chuck and the gearbox are connected by an oil-gas passage; one end of the oil-gas passage is connected to the oil-gas connector, and the other end is connected to the outer wall of the spline section.

[0011] Optionally, a cooling channel is provided axially through the interior of the rotary shaft.

[0012] Optionally, the chuck includes a chuck body and an internal spline built into the chuck body;

[0013] The internal spline has multiple through holes running radially through it; one end of each through hole is connected to the oil and gas passage, and the other end is connected to the outer wall of the spline segment.

[0014] Optionally, an oil storage cavity is formed on the inner wall of the disc body;

[0015] The oil storage cavity is arranged around the circumference of the inner spline; the oil and gas channel, the oil storage cavity, and the through hole are connected in sequence.

[0016] Optionally, the disc body is provided with an end cover that can be detached and installed along the axial direction of the rotation axis;

[0017] The inner wall of the disc body is connected to the internal spline via a spline; the two ends of the internal spline abut against the inner walls of a pair of end caps.

[0018] Optionally, the disc body is provided with an end cover that can be detached and installed along the axial direction of the rotation axis;

[0019] The inner wall of the disc and the outer wall of the inner spline are both polyhedrons, and their surfaces abut each other; the two ends of the inner spline abut the inner walls of a pair of end caps.

[0020] Optionally, the gearbox further includes an intermediate gear shaft that meshes with the main shaft and an output gear shaft that meshes with the intermediate gear shaft.

[0021] The output gear shaft is connected to the hydraulic motor.

[0022] Optionally, the speed sensor is a Hall sensor.

[0023] Optionally, the speed sensor can detect the number of gear teeth that the gearbox passes through per unit time, and calculate the rotational speed of the spindle by combining the gear ratios within the gearbox.

[0024] Optionally, the rock drill outputs a torque T = P RL ·q0 / 2πη m ;

[0025] Among them, P RLη is the pressure of the hydraulic motor; q0 is the displacement of the hydraulic motor; η is the displacement of the hydraulic motor. m The efficiency of the hydraulic motor is given.

[0026] (III) Beneficial Effects

[0027] The beneficial effects of this invention are:

[0028] The spline section can drive the chuck to rotate, and the rotary shaft can slide axially within the chuck. This allows the rotary shaft to transmit the rotational torque of the rock drill to the chuck, then to the gearbox, and finally to the hydraulic motor to measure the rotational torque. The rotary shaft can also transmit the axial impact force of the rock drill to an external load device for measurement, thus enabling the measurement of the output torque, speed, and axial impact force of the rock drill under test.

[0029] One end of the oil-gas passage is connected to the oil-gas connector, and the other end is connected to the outer wall of the spline section to introduce lubricating oil and gas between the spline section and the chuck, thereby reducing the friction between the spline section and the chuck, reducing the damage caused by insufficient lubrication during the axial movement of the rotary shaft, and extending the service life of the torque loading device.

[0030] Unlike traditional rotary torque loading devices, the torque loading device of this invention can withstand significant axial impact while performing rotary torque loading. A spline structure is used as a wear component to reduce the probability of damage to other parts of the rotary torque loading device. Oil-air lubrication is used as the lubrication method for the torque loading spline, reducing damage caused by water ingress into the load device and providing both lubrication and waterproofing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the torque loading device of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the rotating shaft of the present invention;

[0033] Figure 3 This is a cross-sectional view of the rotating shaft of the present invention;

[0034] Figure 4 This is a partial cross-sectional view of the torque loading device of the present invention;

[0035] Figure 5 This is a schematic diagram of the internal spline structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the gearbox structure of the present invention;

[0037] Figure 7 This is a diagram of the rotational speed detection signal of the rock drill of the present invention.

[0038] [Explanation of Labels in the Attached Image]

[0039] 1: Rotary shaft; 11: Rock drill connection section; 12: Spline section; 13: Cooling channel; 14: Load connection section;

[0040] 2: Chuck; 21: Disc body; 211: Oil reservoir; 212: End cap; 22: Internal spline; 221: Through hole; 23: Oil and gas passage;

[0041] 3: Gearbox; 31: Main shaft; 32: Intermediate gear shaft; 33: Output gear shaft; 34: Oil / gas connector;

[0042] 4: Speed ​​sensor;

[0043] 5: Hydraulic motor. Detailed Implementation

[0044] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0046] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] See Figures 1 to 3 as well as Figure 6This invention provides a torque loading device, which includes a rotary shaft 1, a chuck 2, a gearbox 3, an oil-gas connector 34, a speed sensor 4, and a hydraulic motor 5. The rotary shaft 1 has a rock drill connecting section 11, a spline section 12, and a load connecting section 14 arranged sequentially along its axial direction. The chuck 2 is sleeved on the spline section 12. The rotary shaft 1 can drive the chuck 2 to rotate, and the rotary shaft 1 can slide axially within the chuck 2. The main shaft 31 of the gearbox 3 is coaxially connected to the chuck 2. The load connecting section 14 passes through the gearbox 3. The speed sensor 4 and the hydraulic motor 5 are correspondingly installed on the gearbox 3. The speed sensor 4 can detect the number of gear teeth passing through per unit time. The hydraulic motor 5 can load the rotation torque of the gearbox 3. The oil-gas connector 34 is installed on the gearbox 3. An oil-gas channel 23 is connected between the chuck 2 and the gearbox 3. One end of the oil-gas channel 23 is connected to the oil-gas connector 34, and the other end is connected to the outer wall of the spline section 12.

[0049] In this embodiment, the rock drill connecting section 11 is a threaded section, and the rock drill connecting section 11 is threadedly connected to the rock drill. The spline section 12 is engaged with the chuck 2 through a spline structure. The spline section 12 can transmit rotational torque and ensure that the rotating shaft 1 can move axially. The load connecting section 14 is connected to an external load device, which consumes the rotational energy output by the rock drill. The rock drill transmits the rotational torque sequentially to the rotating shaft 1, chuck 2, gearbox 3, and hydraulic motor 5. The gearbox 3 has a built-in multi-stage gear transmission, which facilitates the speed sensor 4 to detect the number of teeth passed by the monitored gears per unit time, and then calculates the rotational speed of the spindle 31.

[0050] The spline section 12 can drive the chuck 2 to rotate, and the rotary shaft 1 can slide axially within the chuck 2. This allows the rotary shaft 1 to transmit the rotational torque of the rock drill to the chuck 2, then to the gearbox 3, and measure the rotational speed of the spindle 31 through the speed sensor 4, and finally transmit it to the hydraulic motor 5 to measure the rotational torque. The rotary shaft 1 can also transmit the axial impact force of the rock drill to an external load device for measurement, thus realizing the measurement of the output torque, speed, and axial impact force of the rock drill under test.

[0051] One end of the oil-gas passage 23 is connected to the oil-gas connector 34, and the other end is connected to the outer wall of the spline section 12, so as to introduce lubricating oil and gas between the spline section 12 and the chuck 2, thereby reducing the friction between the spline section 12 and the chuck 2, reducing the damage caused by insufficient lubrication during the axial movement of the rotary shaft 1, and extending the service life of the torque loading device.

[0052] Unlike traditional rotary torque loading devices, the torque loading device of this invention can withstand significant axial impact while performing rotary torque loading. A spline structure is used as a wear component to reduce the probability of damage to other parts of the rotary torque loading device. Oil-air lubrication is used as the lubrication method for the torque loading spline, reducing damage caused by water ingress into the load device and providing both lubrication and waterproofing.

[0053] Furthermore, a cooling channel 13 is axially extended through the interior of the rotary shaft 1. Cooling water is circulated through the cooling channel 13 for cooling, ensuring that the spline structure does not fail due to overheating under continuous impact. Optionally, the cooling channel 13 is a central water hole, i.e., the cooling channel 13 is hole-shaped and coaxially arranged with the rotary shaft 1, which facilitates uniform cooling of the outer wall of the spline section 12, improves the cooling effect, and thus extends the service life of the spline structure and ensures detection accuracy. In addition, both ends of the cooling channel 13 extend through the two end faces of the rotary shaft 1, and water is directly supplied into the cooling channel 13 through the rock drill, and then discharged through the load connection section 14 or an external load device. Traditional cooling methods generally use lubricating oil and gas to carry away the heat inside the equipment, i.e., a cooling channel 13 is opened inside the rotary shaft 1 and the cooling channel 13 is connected to the outer wall of the spline section 12. The lubricating oil and gas are used for both lubrication and cooling, but the fluidity of oil and gas inside the torque loading device is poor, and the cooling effect of the oil and gas cooling method is poor. The rotating shaft 1 of the present invention has a cooling channel 13 inside, which separates oil and water and keeps the oil and gas in a basically sealed state, which can ensure the lubrication effect of the spline structure for a long time; the cooling water flows at high speed through the cooling channel 13 to achieve efficient heat dissipation of the spline structure and extend the service life of the spline structure.

[0054] like Figure 3 As shown, the chuck 2 includes a disc body 21 and an internal spline 22 built into the disc body 21; the internal spline 22 has multiple through holes 221 extending radially; one end of the through hole 221 communicates with the oil and gas channel 23, and the other end communicates with the outer wall of the spline section 12. Specifically, the internal spline 22 is provided inside the disc body 21, and the internal spline 22 and the spline section 12 are driven by meshing through the spline structure. Optionally, the internal spline 22 is a copper spline, which is used as a wear part to relatively extend the service life of other components of the torque loading device. Multiple through holes 221 are provided in both the axial and circumferential directions of the internal spline 22. The specific number of through holes 221 is set according to requirements, as long as the lubricating oil and gas can be fully filled between the spline structures to avoid dead corners for the introduction of lubricating oil and gas between the spline structures, which would aggravate the frictional damage of the spline structure.

[0055] See Figure 4An oil storage cavity 211 is provided on the inner wall of the disc body 21; the oil storage cavity 211 is arranged around the circumference of the inner spline 22; the oil-gas channel 23, the oil storage cavity 211, and the through hole 221 are connected in sequence. Based on the oil storage using multiple through holes 221 and the oil-gas channel 23, the addition of an oil storage cavity 211 further increases the oil storage capacity of the torque loading device. On the one hand, the increased oil storage capacity allows the torque loading device to effectively adapt to the lag of liquid or gas pipelines during initial startup. That is, compared to the method where lubricating oil and gas need to be introduced through the oil-gas connector 34 each time the equipment is started, the disc body 21 of this invention itself has a certain oil storage function. Therefore, it can lubricate the spline structure with the stored lubricating oil and gas before the rotating shaft 1 rotates, eliminating the influence of the lag of the gas-liquid pipeline and improving the service life of the spline structure. On the other hand, the increased oil storage capacity increases the gas-liquid volume within the disc 21, allowing the lubricating oil vapor to act as an auxiliary coolant for cooling the spline structure. This works in conjunction with the main coolant, i.e., the cooling water in the cooling channel 13, to cool the spline structure and ensure the stability of the spline transmission during long-term operation. Furthermore, the oil storage chamber 211 is arranged in a ring around the circumference of the inner spline 22, resulting in more uniform and thorough cooling and lubrication.

[0056] In the first embodiment, the disc body 21 is provided with end caps 212 that can be detached and installed axially along the rotating shaft 1, optionally connected by bolts; the inner wall of the disc body 21 is connected to the inner spline 22 via a spline (not shown); the two end faces of the inner spline 22 abut against the inner walls of a pair of end caps 212 to achieve a fixed installation of the disc body 21 and the inner spline 22. In this embodiment, both the interior and exterior of the inner spline 22 are connected by a spline structure, which fully utilizes the performance of the inner spline 22 when used as a consumable part, and better protects the rotating shaft 1, the disc body 21, and other components. The end caps 212 can be detached and installed axially along the rotating shaft 1, facilitating the axial removal and installation of the inner spline 22, and improving the efficiency and convenience of replacing consumable parts.

[0057] In the second embodiment, see Figure 4 and Figure 5 The disc body 21 is provided with end caps 212 that can be detached and installed along the axial direction of the rotation shaft 1. The inner wall of the disc body 21 and the outer wall of the inner spline 22 are both polyhedral, and their surfaces abut against each other. The two end faces of the inner spline 22 abut against the inner walls of a pair of end caps 212. In this embodiment, the inner spline 22 has an external hexagonal structure, and the inner wall of the disc body 21 has an internal hexagonal structure. The surface abutment transmission method can also realize the transmission of rotational torque, and the transmission stability is stronger.

[0058] Furthermore, the gearbox 3 also includes an intermediate gear shaft 32 that meshes with the main shaft 31 and an output gear shaft 33 that meshes with the intermediate gear shaft 32; the output gear shaft 33 is connected to the hydraulic motor 5. In this embodiment, the gearbox 3 outputs rotational torque to the hydraulic motor 5 through a two-stage gear transmission. A speed sensor 4 is installed on one side of the intermediate gear shaft 32 and monitors the number of teeth passed by the intermediate gear shaft 32 per unit time. The multi-stage gear transmission method can adjust the speed and torque accordingly. Generally, it is necessary to increase the speed of the gearbox 3 and reduce the torque to facilitate measurement by the speed sensor 4. The number of gear stages of the gearbox 3 and the installation position of the speed sensor 4 are set according to the measurement requirements.

[0059] In addition, the speed sensor 4 is a Hall sensor. Using a non-contact method such as a Hall sensor to measure rotational speed is beneficial for rock drills and rotary torque loading devices operating under conditions of strong vibration. Non-contact measurement helps protect the speed sensor 4 from damage due to vibration, thereby extending the service life of the speed sensor 4.

[0060] Furthermore, the speed sensor 4 can detect the number of gear teeth that the gearbox 3 passes through per unit time, and calculate the rotational speed of the spindle 31 by combining the gear ratios within the gearbox 3. Figure 7 The image shows the rock drill speed detection signal obtained by the Hall sensor under strong vibration conditions in one embodiment. The corresponding speeds per unit time are basically consistent, which shows that the non-contact speed measurement method is beneficial to improving the measurement accuracy of the speed sensor 4 under strong vibration conditions.

[0061] Secondly, the rock drill output torque T = P RL ·q0 / 2πη m Among them, P RL η is the pressure of hydraulic motor 5; q0 is the displacement of hydraulic motor 5; η is the displacement of hydraulic motor 5. m The mechanical efficiency of hydraulic motor 5 is assessed. Hydraulic motor 5 achieves rotational torque loading through outlet throttling, allowing for simultaneous rotational and impact testing. The multi-stage transmission structure of gearbox 3 enhances the measurement accuracy of rotational torque and gear tooth count, thereby improving the reliability of the equipment.

[0062] It should be understood that the above description of specific embodiments of the present invention is only for illustrating the technical approach and features of the present invention, and is intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of the present invention should be covered within the protection scope of the present invention.

Claims

1. A torque loading device, characterized in that, The torque loading device includes a rotary shaft (1), a chuck (2), a gearbox (3), an oil-gas connector (34), a speed sensor (4), and a hydraulic motor (5). The rotary shaft (1) is provided with a rock drill connecting section (11), a spline section (12), and a load connecting section (14) in sequence along its axial direction; the chuck (2) is sleeved on the spline section (12); the rotary shaft (1) can drive the chuck (2) to rotate, and the rotary shaft (1) can slide axially within the chuck (2); the main shaft (31) of the gearbox (3) is coaxially connected to the chuck (2); the load connecting section (14) passes through the gearbox (3). The speed sensor (4) and the hydraulic motor (5) are respectively installed on the gearbox (3); the speed sensor (4) can detect the number of gear teeth passing through per unit time; the hydraulic motor (5) can load the rotational torque of the gearbox (3); The oil-gas connector (34) is installed on the gearbox (3); the chuck (2) and the gearbox (3) are connected by an oil-gas passage (23); one end of the oil-gas passage (23) is connected to the oil-gas connector (34), and the other end is connected to the outer wall of the spline section (12) so that lubricating oil and gas can be introduced between the spline section (12) and the chuck (2); The rotating shaft (1) has a cooling channel (13) that runs through its interior axis upwards, and cooling water is introduced into the cooling channel (13) for cooling. The chuck (2) includes a disc body (21) and an internal spline (22) built into the disc body (21); the internal spline (22) has a plurality of through holes (221) in the radial direction; one end of the through hole (221) is connected to the oil and gas channel (23), and the other end is connected to the outer wall of the spline segment (12).

2. The torque loading device according to claim 1, characterized in that, An oil storage cavity (211) is provided on the inner wall of the disc body (21). The oil storage chamber (211) is arranged around the circumference of the inner spline (22); the oil and gas passage (23), the oil storage chamber (211) and the through hole (221) are connected in sequence.

3. The torque loading device according to claim 1, characterized in that, The disc body (21) is provided with an end cap (212) that can be detached and installed along the axial direction of the rotation shaft (1). The inner wall of the disc body (21) is connected to the inner spline (22) by a spline; the two ends of the inner spline (22) abut against the inner walls of a pair of end caps (212).

4. The torque loading device according to claim 1, characterized in that, The disc body (21) is provided with an end cap (212) that can be detached and installed along the axial direction of the rotation shaft (1). The inner wall of the disc body (21) and the outer wall of the inner spline (22) are both polyhedra, and their surfaces abut against each other; the two ends of the inner spline (22) abut against the inner walls of a pair of end caps (212).

5. The torque loading device according to any one of claims 1-4, characterized in that, The gearbox (3) also includes an intermediate gear shaft (32) that meshes with the main shaft (31) and an output gear shaft (33) that meshes with the intermediate gear shaft (32). The output gear shaft (33) is connected to the hydraulic motor (5).

6. The torque loading device according to any one of claims 1-4, characterized in that, The speed sensor (4) is a Hall sensor.

7. The torque loading device according to any one of claims 1-4, characterized in that, The speed sensor (4) can detect the number of gear teeth that the gearbox (3) passes through per unit time, and calculate the rotational speed of the spindle (31) in combination with the gear ratio in the gearbox (3).

8. The torque loading device according to any one of claims 1-4, characterized in that, The rock drill outputs torque T=P RL •q0 / 2πη m ; Among them, P RL η is the pressure of the hydraulic motor (5); q0 is the displacement of the hydraulic motor (5); η is the displacement of the hydraulic motor (5). m The efficiency of the hydraulic motor (5) is given.

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