Torque loading device

Abstract

The invention relates to the technical field of rock drills, in particular to a torque loading device which comprises a rotating shaft, a chuck, a gear box, an oil gas connector, a speed measuring sensor and a hydraulic motor. The rotating shaft is sequentially provided with a rock drill connecting section, a spline section and a load connecting section in the axial direction of the rotating shaft. The chuck is sleeved on the spline section; the rotating shaft can drive the chuck to rotate, and the rotating shaft can axially slide in the chuck; a main shaft of the gear box is coaxially connected with the chuck; the load connecting section penetrates through the gear box; the speed measurement sensor and the hydraulic motor are correspondingly mounted on the gear box; the speed measurement sensor can detect the number of teeth of the gear passing in unit time; the hydraulic motor can load the rotation torque of the gear box; the oil-gas joint is mounted on the gear box; the chuck and the gear box are internally communicated with an oil-gas channel; and the other end of the oil-gas channel is communicated to the outer wall of the spline section. And the lubricating oil gas reduces the damage caused by insufficient lubrication in the axial movement process of the rotating shaft.

Description

Technical Field

[0001] The invention relates to the technical field of rock drills, and in particular to a torque loading device. Background Art

[0002] Accurate and efficient rotation performance test equipment is of great significance to the research and development, production and manufacturing of rock drills. It is convenient for the optimization of the design process of rock drills and the quality control of the production process, and improves the research and development and manufacturing level of rock drills. At present, in the rotation performance test of rock drills, the torque loading device can be used to measure the output torque and speed of the tested rock drill, and consume the rotation energy output by the rock drill.

[0003] At present, the torque loading device of the rock drill is mostly loaded by magnetic powder brake or hydraulic throttling. The magnetic powder brake is used as a rotary load, which cannot withstand the axial impact of the rock drill. The rotary test and the impact test need to be carried out separately, and the test efficiency is low. The use of hydraulic throttling can realize the rotary test and the impact test at the same time, but the central axis of the rotary load device needs to withstand a large impact force and axial movement stroke. The load device is easily damaged and needs frequent maintenance and replacement, and the test efficiency is low. Summary of the invention

[0004] 1. Technical issues to be resolved

[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 prior torque loading device has poor adaptability to axial movement and leads to low efficiency in rotation performance testing.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned object, the torque loading device of the present invention comprises a rotary shaft, a chuck, a gear box, an oil-gas joint, a speed sensor and a hydraulic motor;

[0008] The rotary shaft is provided with a rock drill connection section, a spline section and a load connection 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 in the chuck; the main shaft of the gear box is coaxially connected with the chuck; the load connection section runs through the gear box;

[0009] The speed sensor and the hydraulic motor are installed on the gear box correspondingly; the speed sensor can detect the number of gear teeth passing through per unit time; the hydraulic motor can load the rotation torque of the gear box;

[0010] The oil-gas joint is installed on the gear box; an oil-gas passage is connected in the chuck and the gear box; one end of the oil-gas passage is connected to the oil-gas joint, and the other end is connected to the outer wall of the spline section.

[0011] Optionally, a cooling channel is provided in the inner axial direction of the rotary shaft.

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

[0013] A plurality of through holes are passed through the inner spline in the radial direction; one end of the 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 provided on the inner wall of the disc body;

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

[0016] Optionally, the disc body is provided with an end cover which can be disassembled and assembled along the axial direction of the rotary shaft;

[0017] The inner wall of the disc body is connected to the inner spline via a spline; both end surfaces of the inner spline correspondingly abut against the inner walls of a pair of end covers.

[0018] Optionally, the disc body is provided with an end cover which can be disassembled and assembled along the axial direction of the rotary shaft;

[0019] The inner wall of the disc body and the outer wall of the inner spline are both polyhedrons, and the two are in surface contact with each other; the two end surfaces of the inner spline are in corresponding contact with the inner walls of a pair of end covers.

[0020] Optionally, the gearbox further comprises an intermediate gear shaft meshing with the main shaft for transmission and an output gear shaft meshing with the intermediate gear shaft for transmission;

[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 passed by the gear box per unit time, and calculate the rotation speed of the main shaft in combination with the gear ratio in the gear box.

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

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

[0026] (III) Beneficial effects

[0027] The beneficial effects of the present invention are:

[0028] The spline section can drive the chuck to rotate, and the rotary shaft can slide axially in the chuck, so that the rotary shaft can transmit the rotary torque of the rock drill to the chuck, and then transmit it to the gear box and measure the rotation speed of the main shaft through the speed sensor, and finally transmit it to the hydraulic motor to measure the rotary torque; the rotary shaft can also transmit the axial impact force of the rock drill to the external load device for measurement, thereby realizing the measurement of the output torque, rotation speed and axial impact force of the rock drill under test.

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

[0030] Different from the traditional rotary torque loading device, the torque loading device of the present invention can withstand large axial impact on the basis of rotary torque loading. The spline structure is used as a consumable part to reduce the probability of damage to other parts of the rotary torque loading device. Oil and gas lubrication is used as the torque loading spline lubrication method to reduce the damage caused by water ingress to the load device, and has both lubrication and waterproofing effects. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 2 It is a structural schematic diagram of the rotary shaft of the present invention;

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

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

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

[0036] Figure 6 It is a schematic structural diagram of the gear box of the present invention;

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

[0038] [Description of Reference Numerals]

[0039] 1: rotary shaft; 11: rock drill connection section; 12: spline section; 13: cooling channel; 14: load connection section;

[0040] 2: chuck; 21: plate body; 211: oil storage chamber; 212: end cover; 22: internal spline; 221: through hole; 23: oil and gas channel;

[0041] 3: gear box; 31: main shaft; 32: intermediate gear shaft; 33: output gear shaft; 34: oil and gas joint;

[0042] 4: Speed ​​sensor;

[0043] 5: Hydraulic motor. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

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

[0046] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figures 1 to 3 as well as Figure 6The present invention provides a torque loading device, which includes a rotary shaft 1, a chuck 2, a gear box 3, an oil-gas joint 34, a speed sensor 4 and a hydraulic motor 5; the rotary shaft 1 is sequentially provided with a rock drill connection section 11, a spline section 12 and a load connection section 14 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 in the chuck 2; the main shaft 31 of the gear box 3 is coaxially connected with the chuck 2; the load connection section 14 runs through the gear box 3; the speed sensor 4 and the hydraulic motor 5 are correspondingly installed on the gear box 3; the speed sensor 4 can detect the number of gear teeth passing through per unit time; the hydraulic motor 5 can load the rotary torque of the gear box 3; the oil-gas joint 34 is installed on the gear box 3; the chuck 2 and the gear box 3 are connected with an oil-gas channel 23; one end of the oil-gas channel 23 is connected with the oil-gas joint 34, and the other end is connected to the outer wall of the spline section 12.

[0049] In this embodiment, the rock drill connection section 11 is a threaded section, and the rock drill connection section 11 is threadedly connected to the rock drill. The spline section 12 cooperates with the chuck 2 through a spline structure, and the spline section 12 can transmit the rotational torque and ensure that the rotary shaft 1 can move axially. The load connection section 14 is connected to an external load device, and the external load device consumes the rotational energy output by the rock drill. The rock drill transmits the rotational torque to the rotary shaft 1, the chuck 2, the gear box 3 and the hydraulic motor 5 in sequence. The gear box 3 has a built-in multi-stage gear transmission, which is convenient for the speed sensor 4 to measure the number of teeth passed by the monitored gear in unit time, and then calculate the rotation speed of the main shaft 31.

[0050] The spline section 12 can drive the chuck 2 to rotate, and the rotary shaft 1 can slide axially in the chuck 2, so that the rotary shaft 1 can transmit the rotary torque of the rock drill to the chuck 2, and then transmit it to the gear box 3 and measure the rotation speed of the main shaft 31 through the speed sensor 4, and finally transmit it to the hydraulic motor 5 to measure the rotary torque; the rotary shaft 1 can also transmit the axial impact force of the rock drill to the external load device for measurement, thereby realizing the measurement of the output torque, rotation speed and axial impact force of the rock drill under test.

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

[0052] Different from the traditional rotary torque loading device, the torque loading device of the present invention can withstand large axial impact on the basis of rotary torque loading. The spline structure is used as a consumable part to reduce the probability of damage to other parts of the rotary torque loading device. Oil and gas lubrication is used as the torque loading spline lubrication method to reduce the damage caused by water ingress to the load device, and has both lubrication and waterproofing effects.

[0053] Furthermore, a cooling channel 13 is provided in the inner axial direction of the rotating shaft 1. Cooling water is introduced into the cooling channel 13 for cooling to ensure that the spline structure will not fail due to heat under continuous impact. Optionally, the cooling channel 13 is a central water hole, that is, the cooling channel 13 is in the shape of a hole and is coaxially arranged with the rotating shaft 1, so as to facilitate uniform cooling of the outer wall of the spline segment 12, improve the cooling effect, and thus improve the service life of the spline structure, and ensure the detection accuracy. In addition, the two ends of the cooling channel 13 pass through the two end surfaces of the rotating shaft 1, and water is directly supplied to the cooling channel 13 through the rock drill, and then discharged through the load connection section 14 or the external load device. The traditional cooling method generally uses lubricating oil and gas to remove the internal heat of the equipment, that is, a cooling channel 13 is opened inside the rotating shaft 1 and the cooling channel 13 is connected to the outer wall of the spline segment 12. The lubricating oil and gas are used for both lubrication and cooling, but the fluidity of the oil and gas inside the torque loading device is poor, and the cooling effect of the cooling method using oil and gas is poor. The rotary shaft 1 of the present invention has a cooling channel 13 inside to separate oil and water, and the oil and gas are basically in a sealed state, which can ensure the lubrication effect of the spline structure for a long time; the cooling water flows at a high speed through the cooling channel 13 to achieve efficient heat dissipation of the spline structure, thereby extending the service life of the spline structure.

[0054] like Figure 3 As shown, the chuck 2 includes a disk body 21 and an internal spline 22 built into the disk body 21; a plurality of through holes 221 are passed through the internal spline 22 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. Specifically, the internal spline 22 is arranged in the disk body 21, and the internal spline 22 and the spline segment 12 are meshed and transmitted through the spline structure. Optionally, the internal spline 22 is a copper spline, and the copper spline is used as a wearing part to relatively extend the service life of other components of the torque loading device. A plurality of through holes 221 are arranged in the axial and circumferential directions of the internal spline 22, and the specific number of the through holes 221 is set according to demand, as long as the lubricating oil and gas can be fully filled between the spline structures, so as to avoid the introduction of the lubricating oil and gas between the spline structures. Dead angles and increased friction damage to the spline structure are avoided.

[0055] See also Figure 4, an oil storage chamber 211 is provided on the inner wall of the disk body 21; the oil storage chamber 211 is arranged around the circumference of the inner spline 22; the oil and gas channel 23, the oil storage chamber 211 and the through hole 221 are connected in sequence. On the basis of utilizing multiple through holes 221 and the oil and gas channel 23 to store oil, an additional oil storage chamber 211 is provided to further expand the oil storage capacity of the torque loading device. On the one hand, the increase in oil storage capacity enables the torque loading device to effectively adapt to the hysteresis of the liquid or gas pipeline during initial startup, that is, compared with the method in which the lubricating oil and gas need to be introduced through the oil and gas joint 34 every time the equipment is started, the disk body 21 of the present invention itself has a certain oil storage function, so the spline structure can be lubricated by the stored lubricating oil and gas before the rotating shaft 1 rotates, thereby eliminating the influence of the hysteresis of the gas-liquid pipeline and improving the service life of the spline structure. On the other hand, the increase in oil storage volume increases the gas-liquid volume in the disc body 21, so that the lubricating oil gas can be used as an auxiliary coolant to cool the spline structure, and cooperate with the main coolant, that is, the cooling water in the cooling channel 13, to cool the spline structure together, ensuring the stability of the spline structure transmission under long-term operation. In addition, the oil storage cavity 211 is arranged in an annular shape on the circumference of the inner spline 22, and the cooling and lubrication are more uniform and sufficient.

[0056] In the first embodiment, the disk body 21 is provided with an end cover 212 that can be disassembled and assembled along the axial direction of the rotary shaft 1, and can be connected by bolts; the inner wall of the disk body 21 is connected to the internal spline 22 by splines (not shown); the two end surfaces of the internal spline 22 are correspondingly abutted against the inner walls of a pair of end covers 212 to achieve fixed installation of the disk body 21 and the internal spline 22. In this embodiment, the inside and outside of the internal spline 22 are connected by a spline structure, which gives full play to the performance of the internal spline 22 when used as a wearing part, and better protects the rotary shaft 1 and the disk body 21 and other parts. The end cover 212 can be disassembled and assembled along the axial direction of the rotary shaft 1, which is convenient for the axial disassembly and assembly of the internal spline 22, and improves the efficiency and convenience of replacing wearing parts.

[0057] In the second embodiment, see Figure 4 and Figure 5 The disc body 21 is provided with an end cover 212 that can be disassembled and assembled along the axial direction of the rotary shaft 1; the inner wall of the disc body 21 and the outer wall of the inner spline 22 are both polyhedrons, and the two are in face-to-face contact; the two end faces of the inner spline 22 are in correspondence with the inner walls of a pair of end covers 212. In this embodiment, the inner spline 22 is an external hexagonal structure, and the inner wall of the disc body 21 is an internal hexagonal structure. The face-to-face contact transmission mode can also realize the transmission of the rotary torque, and the transmission stability is stronger.

[0058] Furthermore, the gearbox 3 also includes an intermediate gear shaft 32 meshing with the main shaft 31 and an output gear shaft 33 meshing 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 the rotational torque to the hydraulic motor 5 through a two-stage gear transmission. The 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 transmission mode of the multi-stage gear 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 the measurement of 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 Hall sensor or other non-contact method to measure the rotation speed is beneficial to protect the speed sensor 4 from being damaged by vibration when the rock drill and the rotary torque loading device are in strong vibration conditions, thereby extending the service life of the speed sensor 4.

[0060] Furthermore, the speed sensor 4 can detect the number of gear teeth passed by the gear box 3 per unit time, and calculate the rotation speed of the main shaft 31 in combination with the gear ratio in the gear box 3 . Figure 7 3 is a diagram of a rock drill speed detection signal measured by a Hall sensor under strong vibration conditions in an embodiment. The corresponding speeds per unit time are basically consistent. It can be seen 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 output torque of the rock drill is T = P RL q0 / 2πη m ; Among them, P RL is the pressure of the hydraulic motor 5; q0 is the displacement of the hydraulic motor 5; η m is the mechanical efficiency of the hydraulic motor 5. The hydraulic motor 5 realizes the loading of the rotary torque by outlet throttling, and the rotary test and the impact test can be carried out simultaneously. The multi-stage transmission structure of the gear box 3 improves the measurement accuracy of the rotary torque and the number of gear teeth, and improves the reliability of the equipment measurement.

[0062] It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but the present invention is not limited to the above specific implementation methods. Any changes or modifications made within the scope of the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. A torque loading device, characterized in that: The torque loading device comprises a rotary shaft (1), a chuck (2), a gear box (3), an oil-gas joint (34), a speed sensor (4) and a hydraulic motor (5); The rotary shaft (1) is provided with a rock drill connection section (11), a spline section (12) and a load connection 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 in the chuck (2); the main shaft (31) of the gear box (3) is coaxially connected to the chuck (2); the load connection section (14) passes through the gear box (3); The speed sensor (4) and the hydraulic motor (5) are mounted on the gear box (3) accordingly; 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 gear box (3); The oil-gas joint (34) is mounted on the gear box (3); an oil-gas passage (23) is connected inside the chuck (2) and the gear box (3); one end of the oil-gas passage (23) is connected to the oil-gas joint (34), and the other end is connected to the outer wall of the spline section (12).

2. The torque loading device according to claim 1, characterized in that: A cooling channel (13) is provided in the axial direction inside the rotary shaft (1).

3. The torque loading device according to claim 1, characterized in that: The chuck (2) comprises a chuck body (21) and an internal spline (22) built into the chuck body (21); A plurality of through holes (221) are passed through the inner spline (22) in the radial direction; one end of the through hole (221) is connected to the oil and gas passage (23), and the other end is connected to the outer wall of the spline section (12).

4. The torque loading device according to claim 3, characterized in that: An oil storage cavity (211) is provided on the inner wall of the disk body (21); The oil storage chamber (211) is arranged around the circumference of the internal spline (22); the oil and gas passage (23), the oil storage chamber (211) and the through hole (221) are connected in sequence.

5. The torque loading device according to claim 3, characterized in that: The disk body (21) is provided with an end cover (212) which can be disassembled and assembled along the axial direction of the rotary shaft (1); The inner wall of the disk body (21) is connected to the inner spline (22) via a spline; the two end surfaces of the inner spline (22) are correspondingly abutted against the inner walls of a pair of end covers (212).

6. The torque loading device according to claim 3, characterized in that: The disk body (21) is provided with an end cover (212) which can be disassembled and assembled along the axial direction of the rotary shaft (1); The inner wall of the disc body (21) and the outer wall of the inner spline (22) are both polyhedrons, and the two are in surface contact with each other; the two end surfaces of the inner spline (22) are in corresponding contact with the inner walls of a pair of end covers (212).

7. The torque loading device according to any one of claims 1 to 6, characterized in that: The gear box (3) further comprises an intermediate gear shaft (32) meshing with the main shaft (31) for transmission, and an output gear shaft (33) meshing with the intermediate gear shaft (32) for transmission; The output gear shaft (33) is connected to the hydraulic motor (5).

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

9. The torque loading device according to any one of claims 1 to 6, characterized in that: The speed sensor (4) is capable of detecting the number of gear teeth that pass through the gear box (3) per unit time, and calculating the rotation speed of the main shaft (31) in combination with the gear ratio in the gear box (3).

10. The torque loading device according to any one of claims 1 to 6, characterized in that: The rock drill output torque T = P RL q0 / 2πη m ; Among them, P RL is the pressure of the hydraulic motor (5); q0 is the displacement of the hydraulic motor (5); η m is the efficiency of the hydraulic motor (5).

Images