Drilling machine power head torque testing device and testing method thereof

Abstract

The invention provides a drilling machine power head torque testing device and a testing method thereof. The testing device comprises a base, a rotary support arranged on the base and a force transmission connector arranged at the top of the rotary support and used for being connected with a force transmission drill rod. The rotary support comprises an inner ring and an outer gear ring which is rotatably arranged outside the inner ring; the testing device further comprises a hydraulic control system and a plurality of resistance units, the resistance units are evenly distributed in the circumferential direction of the rotary support, each resistance unit comprises a testing table hydraulic motor and a gear shaft in driving connection with the testing table hydraulic motor, and the gear shafts are in meshed connection with the outer gear ring. The hydraulic control system is used for controlling the resistance unit and the tested drilling machine power head hydraulic motor to generate different backpressures so as to obtain different driving torques; according to the invention, the rated torque of drilling machine power heads of different models can be tested, and the dynamic output torque of the power heads can be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly relates to a torque testing device for a drill rig power head and a testing method thereof. Background Art

[0002] Based on market demand, drill rigs need to be designed in series. That is, different drill rig power heads have different rated torques, and it is necessary to detect and evaluate the actual rated output torque and dynamic output torque of these different drill rig power heads in a timely manner.

[0003] However, the existing drill pipe torque detection platforms have the following problems:

[0004] 1. Most traditional torque test benches are for a single type of drill pipe and cannot meet the rated torque tests of drill rig power heads of multiple models.

[0005] 2. Traditional torque test benches cannot simulate working conditions and thus cannot test the dynamic output torque of the power head.

[0006] 3. Traditional torque test benches cannot display the operating torque of the power head in real time through their own monitoring systems.

[0007] Therefore, there is an urgent need for a torque testing device for a drill rig power head and a testing method thereof that can test the rated torque of drill rig power heads of different models and can test the dynamic output torque of the power head. Summary of the Invention

[0008] The purpose of the present invention is to provide a torque testing device for a drill rig power head and a testing method thereof, aiming to solve the technical problems that traditional test benches cannot meet the torque tests of power heads of multiple different models and cannot test the dynamic output torque of the power head.

[0009] To achieve the above purpose, in the first aspect, the present invention provides a torque testing device for a drill rig power head,

[0010] including a base, a slewing bearing arranged on the base, and a force transmission connector arranged on the top of the slewing bearing for connecting a force transmission drill pipe; the slewing bearing includes an inner ring and an outer gear ring rotatably arranged outside the inner ring;

[0011] The testing device further includes a hydraulic control system and a plurality of resistance units. The resistance units are evenly distributed along the circumferential direction of the slewing bearing. Each resistance unit includes a test bench hydraulic motor and a gear shaft drivingly connected to the test bench hydraulic motor. The gear shaft is meshed with the outer gear ring; the hydraulic control system is used to control the resistance units and the hydraulic motor of the drill rig power head to be tested to generate different back pressures to obtain different driving torques.

[0012] As a further improvement of the above solution, the force transmission connector is connected to the top of the outer gear ring of the slewing bearing through a rotating cylinder;

[0013] The rotating cylinder is rotatably arranged in the middle of the base, the slewing bearing is sleeved outside the rotating cylinder, and its inner ring is fixedly connected to the bottom of the base, and the top of its outer gear ring is fixedly connected to the rotating cylinder through a connecting ring; and there is a preset gap between the outer wall of the rotating cylinder and the inner wall of the slewing bearing.

[0014] As a further improvement of the above solution, the rotating cylinder includes a rotating cylinder body, a bearing shoulder arranged at one end of the rotating cylinder body, a convex ring arranged in the middle of the rotating cylinder body and extending outward, and an edge arranged at the other end of the rotating cylinder body;

[0015] The inner side of the connecting ring is connected to the top of the convex ring, and the outer side of the connecting ring is connected to the top of the outer gear ring of the slewing bearing;

[0016] The force transmission connector is detachably connected to the edge end of the rotating cylinder.

[0017] As a further improvement of the above solution, the rotating cylinder is rotatably arranged in the middle of the base through a base bearing, and the base bearing is arranged at one end of the rotating cylinder body and is fixedly arranged at the bottom of the base through an end cover.

[0018] As a further improvement of the above solution, the force transmission connector includes a connector body and a force transmission blind hole arranged along the height direction of the connector body for accommodating and installing the force transmission drill pipe;

[0019] Along the radial direction of the connector body, there is also a connecting pin hole for connecting the force transmission drill pipe to be tested through a pin shaft;

[0020] The connecting pin hole communicates with the force transmission blind hole, and its axis is perpendicular to the axis of the force transmission blind hole.

[0021] As a further improvement of the above solution, there is also a speed reducer between the test bench hydraulic motor and the gear shaft, and the test bench hydraulic motor, the speed reducer and the gear shaft are arranged on the base in sequence from top to bottom;

[0022] Each gear shaft is meshed and connected to the outer gear ring of the slewing bearing.

[0023] As a further improvement of the above solution, the hydraulic control system includes an oil pump group, and the oil pump group is connected to the working oil port of the test bench hydraulic motor through a logic control valve;

[0024] A motor variable proportional valve is also provided between the logic control valve and the hydraulic motor of the test bench for real-time control and adjustment of the rated torque of the hydraulic motor of the test bench.

[0025] A pressure control proportional relief valve is also provided on the oil return line of the logic control valve for real-time control and adjustment of the back pressure and actual operating torque of the hydraulic motor of the test bench.

[0026] The logic control valve is also used to connect to the two working oil ports of the hydraulic motor of the drill rig power head to be tested.

[0027] As a further improvement of the above solution, a cooler is also provided between the pressure control proportional relief valve and the fuel tank.

[0028] As a further improvement of the above solution, A-port pressure sensors and B-port pressure sensors are respectively provided at the two working oil ports of the hydraulic motor of the drill rig power head to be tested, and the two pressure sensors are communicatively connected to the controller of the torque testing device of the drill rig power head. The controller calculates and obtains the test torque value based on the pressure values obtained by the two pressure sensors.

[0029] As a further improvement of the above solution, the hydraulic control system further includes a make-up check valve, and the make-up check valve is arranged between the oil pump group and the logic control valve and is communicated with the fuel tank.

[0030] As a further improvement of the above solution, the logic control valve includes a valve block, and a first check valve, a second check valve, a third check valve and a fourth check valve are arranged in the valve block;

[0031] The conducting ends of the first check valve and the second check valve are oppositely arranged and are communicated with each other through a first oil passage;

[0032] The ends of the third check valve and the fourth check valve away from the conducting ends are oppositely arranged and are communicated with each other through a second oil passage;

[0033] The oil outlet of the oil pump group is communicated with the first oil passage, and the pressure control proportional relief valve is communicated with the second oil passage.

[0034] Second, the present invention also provides a test method for a drill rig power head torque testing device as provided in the first aspect, and its steps include:

[0035] S1. Connect the transmission drill pipe connected to the drill rig power head to be tested to the force transmission connector;

[0036] S2. Start the oil pump group of the hydraulic control system, and the hydraulic motor of the test bench generates a resistance torque. The resistance torque acts on the force transmission connector after increasing the torque through the gear shaft and the slewing bearing in sequence. The corresponding torque output by the power head of the drill rig under test connected to the force transmission connector overcomes the resistance torque generated by the hydraulic motor of the test bench;

[0037] S21. Adjust the control current of the control pressure control proportional relief valve to change the back pressure of the hydraulic motor of the test bench and the hydraulic motor of the power head of the drill rig under test to simulate different working conditions, and obtain the dynamic output torque of the power head of the drill rig under test;

[0038] S22. Adjust the control current of the control motor variable ratio valve to obtain different rated torques of the hydraulic motor of the test bench to test the rated torques of the hydraulic motors of power heads of different types of drill rigs.

[0039] Since the present invention adopts the above technical solutions, the beneficial effects of the present application are as follows:

[0040] A torque testing device for a drill rig power head provided by the present invention includes a base, a slewing bearing disposed on the base, and a force transmission connector disposed on the top of the slewing bearing for connecting a force transmission drill pipe; the slewing bearing includes an inner ring and an outer gear ring rotatably disposed outside the inner ring; the testing device further includes a hydraulic control system and a plurality of resistance units, the resistance units are evenly distributed along the circumference of the slewing bearing, the resistance unit includes a test bench hydraulic motor and a gear shaft drivingly connected to the test bench hydraulic motor, and the gear shaft is meshed and connected to the outer gear ring; the hydraulic control system is used to control the resistance units and the hydraulic motor of the drill rig power head to be tested to generate different back pressure to obtain different driving torques; in the present invention, first, by providing a force transmission connector and a slewing bearing, it is convenient to connect and transmit the force transmission drill pipe of the drill rig power head to be tested through the force transmission connector, and then creatively evenly distribute a plurality of resistance units outside and meshed with the outer gear ring of the slewing bearing. With such a setting, the test bench hydraulic motor generates a resistance torque, and the resistance torque acts on the force transmission connector after being increased in torque by the gear shaft and the slewing bearing in sequence. The drill rig power head to be tested connected to the force transmission connector needs to output a corresponding torque to overcome the resistance torque generated by the test bench hydraulic motor, so as to realize the test of the torque of the drill rig power head to be tested; by controlling the back pressure of the test bench hydraulic motor, the change of the working condition load can be simulated, so as to realize the dynamic torque test of the drill rig power head; the torque testing device for the drill rig power head provided by the present invention has a simple structure, and a pressure control proportional relief valve is provided in the hydraulic control system. By adjusting the control current of the pressure control proportional relief valve, the back pressure and the actual operating torque of the test bench hydraulic motor can be controlled and adjusted in real time, and the control is simple and reliable; a motor variable ratio valve is also provided in the hydraulic control system. By adjusting the control current of the motor variable ratio valve, the rated torque of the test bench hydraulic motor can be controlled and adjusted in real time; thus, the torque test with a wider range of the torque testing device is realized, and further the test of the rated torque of the drill rig power heads of different models is realized;

[0041] In addition, a logic control valve is provided in the present invention. The oil outlet of the oil pump group is communicated with the first oil passage of the logic control valve, and the pressure control proportional relief valve is communicated with the second oil passage of the logic control valve. The logic control valve is provided so that the torque testing device can simultaneously meet the test requirements for the forward rotation and reverse rotation of the drill rig power head; whether the hydraulic motor of the drill rig power head to be tested rotates forward or reverses, the corresponding passage can be conducted and the back pressure can be adjusted by controlling and adjusting the control current of the pressure control proportional relief valve;

[0042] Furthermore, in the present invention, an A-port pressure sensor and a B-port pressure sensor are respectively provided at two working oil ports of the hydraulic motor of the drill rig power head to be detected, and the two pressure sensors are communicatively connected to a controller of the torque testing device of the drill rig power head. The controller calculates a test torque value based on the pressure values obtained by the two pressure sensors. In some preferred embodiments, the controller is further connected to a display, and can display the test torque value on the display, so as to realize the real-time display of the operating torque of the test drill rig power head. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0044] Figure 1 It is a top view schematic diagram of a torque testing device for a drill rig power head disclosed by the present invention;

[0045] Figure 2 It is a partial cross-sectional view schematic diagram of a torque testing device for a drill rig power head disclosed by the present invention;

[0046] Figure 3 It is a schematic diagram of a hydraulic control system for a torque testing device for a drill rig power head disclosed by the present invention;

[0047] Figure 4 It is a cross-sectional view schematic diagram of a rotary drum disclosed by the present invention;

[0048] Figure 5 It is a position schematic diagram when the drill pipe for transmitting force of the present invention and the torque testing device of the drill rig power head are tested.

[0049] Reference numerals:

[0050] 1, base; 2, slewing bearing; 21, inner ring; 22, external gear ring; 3, force transmission connector; 31, connector body; 32, force transmission blind hole; 33, connection pin hole; 4, resistance unit; 41, test bench hydraulic motor; 42, gear shaft; 43, reducer;

[0051] 5, hydraulic control system; 51, oil pump group; 52, logic control valve; 54, motor variable ratio valve; 55, pressure control proportional relief valve; 56, cooler; 57, A-port pressure sensor; 58, B-port pressure sensor; 59, oil replenishing check valve;

[0052] 6. Rotary drum; 61. Rotary drum body; 62. Bearing shoulder; 63. Convex ring; 64. Edge; 7. Connecting ring; 8. Base bearing; 9. End cover; 10. Force-transfer drill pipe; 11. Hydraulic motor of drilling rig power head.

[0053] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0055] It should be noted that all directional indications (such as up, down...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0056] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0057] Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] Embodiment 1

[0059] Refer to Figures 1 - 5 , the present invention provides a torque testing device for a drilling rig power head, including a base 1, a slewing bearing 2 arranged on the base 1, and a force-transfer connector 3 arranged on the top of the slewing bearing 2 for connecting a force-transfer drill pipe 10; the slewing bearing 2 includes an inner ring 21 and an outer gear ring 22 rotatably arranged outside the inner ring 21;

[0060] The testing device further includes a hydraulic control system 5 and a plurality of resistance units 4, and the resistance units 4 are evenly distributed along the circumferential direction of the slewing bearing 2. Refer to Figure 1, in this embodiment, four sets of resistance units 4 are provided. Each set of the resistance units 4 includes a test bench hydraulic motor 41 and a gear shaft 42 drivingly connected to the test bench hydraulic motor 41. The gear shaft 42 is meshed and connected with the external gear ring 22; a speed reducer 43 is further provided between the test bench hydraulic motor 41 and the gear shaft 42. The test bench hydraulic motor 41, the speed reducer 43 and the gear shaft 42 are sequentially arranged on the base 1 from top to bottom; each gear shaft 42 is meshed and connected with the external gear ring 22 of the slewing bearing; the number of teeth of the gear shaft 42 is less than the number of teeth of the external gear ring 22;

[0061] In some embodiments, the gear shaft 42 can also transmit torque by connecting to a drive shaft, arranging a gear meshed with the external gear ring 22 on the drive shaft, and then connecting the drive shaft to the test bench hydraulic motor 41 or the speed reducer 43 through a coupling;

[0062] The hydraulic control system 5 is used to control the resistance units 4 and the hydraulic motor 11 of the power head of the drill rig to be tested to generate different back pressure to obtain different driving torques;

[0063] In the present invention, first, by arranging the force transmission connector 3 and the slewing support 2, it is convenient to connect and transmit the force transmission drill pipe 10 of the power head of the drill rig to be tested through the force transmission connector 3. Then, several resistance units 4 are evenly distributed and meshed outside the external gear ring 22 of the slewing support 2 creatively. With such an arrangement, the test bench hydraulic motor 41 generates a resistance torque, and the resistance torque acts on the force transmission connector 3 after increasing the torque through the gear shaft 42 and the slewing support 2 in sequence. The power head of the drill rig to be tested connected to the force transmission connector 3 needs to output a corresponding torque to overcome the resistance torque generated by the test bench hydraulic motor 41, so as to realize the test of the torque of the power head of the drill rig to be tested; by controlling the back pressure of the test bench hydraulic motor 41, the change of the working condition load can be simulated, so as to realize the dynamic torque test of the power head of the drill rig.

[0064] As a preferred embodiment, the force transmission connector 3 is connected to the top of the external gear ring 22 of the slewing support 2 through a rotating cylinder 6;

[0065] The rotating cylinder 6 is rotatably arranged in the middle of the base 1. The slewing support 2 is sleeved outside the rotating cylinder 6, and its inner ring 21 is fixedly connected to the bottom of the base 1. The top of its external gear ring 22 is fixedly connected to the rotating cylinder 6 through a connecting ring 7; and there is a preset gap between the outer wall of the rotating cylinder 6 and the inner wall of the slewing support 2;

[0066] The setting of the rotary drum 6 can connect the force transmission connector 3 and the top of the external gear ring 22 of the slewing bearing 2, so that the torque on the force transmission drill pipe 10 is first transmitted to the rotary drum 6 through the force transmission connector 3, then transmitted to the external gear ring 22 through the rotary drum 6, and then transmitted to the gear shaft 42, and finally transmitted to the test bench hydraulic motor 41.

[0067] As a preferred embodiment, refer to Figure 4 , the rotary drum 6 includes a rotary drum body 61, a bearing shoulder 62 provided at one end of the rotary drum body 61, a convex ring 63 provided in the middle of the rotary drum body 61 and extending outward, and an edge 64 provided at the other end of the rotary drum body 61;

[0068] The inner side of the connecting ring 7 is connected to the top of the convex ring 63, and the outer side of the connecting ring 7 is connected to the top of the external gear ring 22 of the slewing bearing 2; such a setting makes the structure of this torque test device simple and compact while realizing torque transmission;

[0069] The force transmission connector 3 is detachably connected to the edge 64 end of the rotary drum 6. The detachable connection method is convenient for changing the corresponding specification of the force transmission connector 3 according to the diameter of the force transmission drill pipe 10 with different specifications, so as to improve the versatility of this torque test device.

[0070] As a preferred embodiment, the rotary drum 6 is rotatably arranged in the middle of the base 1 through a base bearing 8. The base bearing 8 is arranged at one end of the rotary drum body 61 and is fixedly arranged at the bottom of the base 1 through an end cover 9; the inner ring 21 of the base bearing 8 abuts against the bearing shoulder 62, and the end cover 9 presses on the outer ring of the base bearing 8; there is a gap between the edge 64 end of the rotary drum 6 and the base 1.

[0071] As a preferred embodiment, refer to Figure 2 , the force transmission connector 3 includes a connector body 31 and a force transmission blind hole 32 arranged along the height direction of the connector body 31 for accommodating and installing the force transmission drill pipe 10;

[0072] The connector body 31 is also provided with a connecting pin hole 33 along its radial direction for connecting the force transmission drill pipe 10 to be tested through a pin shaft;

[0073] The connecting pin hole 33 communicates with the force transmission blind hole 32, and its axis is perpendicular to the axis of the force transmission blind hole 32;

[0074] The settings of the force transmission blind hole 32 and the connecting pin hole 33 can realize the connection between the force transmission drill pipe 10 and the force transmission connector 3, and the connection structure is simple; during operation, refer to Figure 5, it is only necessary to move the force - transmitting drill pipe 10 directly above the force - transmitting blind hole 32 of the force - transmitting connector 3, then lower the force - transmitting drill pipe 10, align the pin shaft hole on the force - transmitting drill pipe 10 with the connecting pin hole 33, and finally connect the force - transmitting drill pipe 10 and the force - transmitting connector 3 through a pin shaft.

[0075] As a preferred embodiment, refer to Figure 3 , the hydraulic control system 5 includes an oil pump group 51, and the oil pump group 51 is connected to the working oil port of the test bench hydraulic motor 41 through a logic control valve 52;

[0076] A motor variable ratio valve 54 is also provided between the logic control valve 52 and the test bench hydraulic motor 41 for controlling and adjusting the rated torque of the test bench hydraulic motor 41 in real - time; specifically, in this embodiment, each test bench hydraulic motor 41 corresponding to a resistance unit 4 is provided with a motor variable ratio valve 54. By controlling the magnitude of the control current of the motor variable ratio valve 54, the adjustment of the rated torque of the test bench hydraulic motor 41 is achieved. Such a setting enables the torque test device provided by the present invention to be applicable to the torque tests of power heads of various different specifications of drilling rigs;

[0077] A pressure - control proportional relief valve 55 is also provided on the oil return circuit of the logic control valve 52 for controlling and adjusting the back - pressure and actual operating torque of the test bench hydraulic motor 41 in real - time;

[0078] Specifically, the logic control valve 52 includes a valve block, and a first check valve, a second check valve, a third check valve, and a fourth check valve are arranged in the valve block;

[0079] The conducting ends of the first check valve and the second check valve are arranged opposite to each other and are interconnected through a first oil passage; the non - conducting ends of the third check valve and the fourth check valve are arranged opposite to each other and are interconnected through a second oil passage;

[0080] The oil outlet of the oil pump group 51 is connected to the first oil passage, and the pressure - control proportional relief valve 55 is connected to the second oil passage;

[0081] The logic control valve 52 is also used to be connected to the two working oil ports of the hydraulic motor 11 of the drilling rig power head to be detected;

[0082] In the hydraulic control system 5 of the present invention, a pressure control proportional relief valve 55 is provided. By adjusting the control current of the pressure control proportional relief valve 55, the back pressure and the actual operating torque of the hydraulic motor 41 of the test bench can be controlled and adjusted in real time, and the control is simple and reliable. A motor variable proportional valve 54 is also provided in the hydraulic control system 5. By adjusting the control current of the motor variable proportional valve 54, the rated torque of the hydraulic motor 41 of the test bench can be controlled and adjusted in real time. Thus, the torque test of a wider range of torques of the present torque test device is realized, and further, the rated torque test of the power heads of different types of drilling rigs is realized.

[0083] In addition, a logic control valve 52 is provided in the present invention. The oil outlet of the oil pump group 51 is communicated with the first oil passage of the logic control valve 52, and the pressure control proportional relief valve 55 is communicated with the second oil passage of the logic control valve 52. The logic control valve 52 is provided so that the present torque test device can simultaneously meet the test requirements for the forward and reverse rotations of the power head of the drilling rig. Whether the hydraulic motor 11 of the power head of the drilling rig to be tested rotates forward or reverses, the corresponding passage can be conducted and the back pressure can be adjusted by controlling and adjusting the control current of the pressure control proportional relief valve 55.

[0084] As a preferred embodiment, a cooler 56 is further provided between the pressure control proportional relief valve 55 and the fuel tank.

[0085] During operation, when all the hydraulic oil of the back pressure of the hydraulic motor 41 of the test bench overflows from the pressure control proportional relief valve 55, a large amount of heat is generated. The setting of the cooler 56 enables the high-temperature hydraulic oil to return to the fuel tank after being cooled by the cooler 56, ensuring the operating temperature of the entire hydraulic control system 5.

[0086] As a preferred embodiment, A-port pressure sensors 57 and B-port pressure sensors 58 are respectively provided at the two working oil ports of the hydraulic motor 11 of the drilling rig power head to be detected, and the two pressure sensors are communicatively connected to the controller of the drilling rig power head torque test device. The controller calculates and obtains the test torque value based on the pressure values obtained by the two pressure sensors. In some preferred embodiments, the controller is further connected to a display, and the test torque value can be displayed on the display, thereby realizing the real-time display of the operating torque of the test drilling rig power head.

[0087] As a preferred embodiment, the hydraulic control system 5 further includes a make-up check valve 59. The make-up check valve 59 is provided between the oil pump group 51 and the logic control valve 52 and is communicated with the fuel tank.

[0088] When the output flow of the oil pump group 51 meets the requirement of the maximum operating speed of this torque testing device, it is necessary to ensure that the hydraulic motor 41 of the test bench has sufficient oil suction flow during operation. When the operating speed of this torque testing device is less than the maximum operating speed, the excess flow reflows back to the hydraulic oil tank through the make-up oil check valve 59.

[0089] Embodiment 2

[0090] The present invention also provides a testing method for a torque testing device of a drilling rig power head as provided in Embodiment 1, and its steps include:

[0091] S1. Connect the transmission drill pipe 10 connected to the drilling rig power head to be tested with the force transmission connector 3;

[0092] S2. Start the oil pump group 51 of the hydraulic control system 5, and the hydraulic motor 41 of the test bench generates a resistance torque. The resistance torque acts on the force transmission connector 3 after being increased in torque by the gear shaft 42 and the slewing bearing 2 in sequence. The drilling rig power head to be tested connected to the force transmission connector 3 outputs a corresponding torque to overcome the resistance torque generated by the hydraulic motor 41 of the test bench;

[0093] S21. Adjust the control current of the control pressure control proportional relief valve 55 to change the back pressure of the hydraulic motor 41 of the test bench and the hydraulic motor 11 of the drilling rig power head to be tested to simulate different working conditions, and obtain the dynamic output torque of the drilling rig power head to be tested;

[0094] S22. Adjust the control current of the control motor variable ratio valve 54 to obtain different rated torques of the hydraulic motor 41 of the test bench to obtain the test of the rated torques of the hydraulic motors 11 of different models of drilling rig power heads;

[0095] The present invention controls the generation of the resistance torque by the hydraulic motor 41 of the test bench. The resistance torque acts on the force transmission connector 3 after being increased in torque by the gear shaft 42 and the slewing bearing 2 in sequence. The drilling rig power head to be tested must output a corresponding torque to overcome the resistance torque of the hydraulic motor 41 of the test bench, so as to obtain the torque of the drilling rig power head to be tested. At the same time, the control current of the control pressure control proportional relief valve 55 can be adjusted to make the hydraulic motor 41 of the test bench generate different resistance torques, and the displacement of the hydraulic motor 41 of the test bench can be changed by controlling the control current of the motor variable ratio valve 54, so that the torque testing device provided by the present invention has a wider torque testing range.

[0096] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A drilling rig power head torque test device, characterized in that: It comprises a base, a slewing support arranged on the base, and a force transmission connector arranged on the top of the slewing support for connecting a force transmission drill rod; the slewing support comprises an inner ring and an outer gear ring rotatably arranged outside the inner ring; The test device further comprises a hydraulic control system and a plurality of resistance units, wherein the resistance units are evenly distributed along the circumference of the slewing support, and the resistance units comprise a test bench hydraulic motor and a gear shaft drivingly connected to the test bench hydraulic motor, wherein the gear shaft is meshingly connected to the outer gear ring; The hydraulic control system is used to control the resistance unit and the hydraulic motor of the tested drilling rig power head to generate different back pressures to obtain different driving torques.

2. A drilling rig power head torque testing device according to claim 1, characterized in that: The force transmission connector is connected to the top of the outer gear ring of the slewing support through a rotating cylinder; The rotating drum is rotatably arranged in the middle of the base, the rotating support sleeve is arranged outside the rotating drum, and its inner ring is fixedly connected to the bottom of the base, and the top of its outer gear ring is fixedly connected to the rotating drum through a connecting ring; and there is a preset gap between the outer wall of the rotating drum and the inner wall of the rotating support.

3. A drilling rig power head torque testing device according to claim 2, characterized in that: The drum comprises a drum body, a bearing shoulder arranged at one end of the drum body, a convex ring arranged in the middle of the drum body and extending outward, and an edge arranged at the other end of the drum body; The inner side of the connecting ring is connected to the top of the convex ring, and the outer side of the connecting ring is connected to the top of the outer gear ring of the slewing support; The force transmission connector is detachably connected to the edge end of the rotating drum.

4. A drilling rig power head torque testing device according to claim 2 or 3, characterized in that: The rotating drum is rotatably arranged in the middle of the base through a base bearing, and the base bearing is arranged at one end of the rotating drum body and fixedly arranged at the bottom of the base through an end cover.

5. A drilling rig power head torque testing device according to any one of claims 1 to 3, characterized in that: The force transmission connector comprises a connector body and a force transmission blind hole arranged along the height direction of the connector body, for accommodating and installing the force transmission drill rod; The connector body is also provided with a connecting pin hole along its radial direction, which is used to connect the tested force transmission drill rod through a pin shaft; The connecting pin hole is communicated with the force transmission blind hole, and the axis of the connecting pin hole is perpendicular to the axis of the force transmission blind hole.

6. A drilling rig power head torque testing device according to any one of claims 1 to 3, characterized in that: The hydraulic control system includes an oil pump group, and the oil pump group is connected to the working oil port of the test bench hydraulic motor through a logic control valve; A motor variable proportional valve is also provided between the logic control valve and the test bench hydraulic motor, for real-time control and adjustment of the rated torque of the test bench hydraulic motor; A pressure-controlled proportional relief valve is also provided on the oil return line of the logic control valve, which is used to control and adjust the back pressure and actual operating torque of the test bench hydraulic motor in real time; The logic control valve is also used to connect with two working oil ports of the hydraulic motor of the drilling rig power head to be tested.

7. A drilling rig power head torque testing device according to claim 6, characterized in that: The two working oil ports of the hydraulic motor of the drilling rig power head to be tested are respectively provided with a port A pressure sensor and a port B pressure sensor, and the two pressure sensors are communicatively connected to the controller of the drilling rig power head torque testing device, and the controller calculates the test torque value based on the pressure values ​​obtained by the two pressure sensors.

8. A drilling rig power head torque testing device according to claim 6, characterized in that: The hydraulic control system further comprises an oil replenishment one-way valve, which is arranged between the oil pump group and the logic control valve and is communicated with the oil tank.

9. A drilling rig power head torque testing device according to any one of claims 1 to 3, characterized in that: The logic control valve includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve disposed in the valve block; The conducting ends of the first one-way valve and the second one-way valve are arranged opposite to each other and are connected to each other through the first oil passage; The third one-way valve and the fourth one-way valve are arranged opposite to each other at the ends away from the conduction and are connected to each other through the second oil passage; The oil outlet of the oil pump group is communicated with the first oil passage, and the pressure-controlled proportional relief valve is communicated with the second oil passage.

10. A method for testing a torque test device for a drilling rig power head, comprising a torque test device for a drilling rig power head as claimed in any one of claims 1 to 9, characterized in that: The steps of the test method include: S1. Connect the force transmission drill rod connected to the power head of the tested drilling rig with the force transmission connector; S2, start the oil pump group of the hydraulic control system, the test bench hydraulic motor generates a resistance torque, the resistance torque is sequentially increased by the gear shaft and the slewing support and acts on the power transmission connector, and the tested drilling rig power head connected to the power transmission connector outputs a corresponding torque to overcome the resistance torque generated by the test bench hydraulic motor; S21, adjusting the control current of the control pressure control proportional relief valve, changing the back pressure of the test bench hydraulic motor and the hydraulic motor of the tested drilling rig power head to simulate different working conditions, and obtaining the dynamic output torque of the tested drilling rig power head; S22, adjusting the control current of the variable proportional valve of the control motor to obtain different rated torques of the hydraulic motor of the test bench to obtain the rated torque test of the hydraulic motor of the power head of different models of drilling rigs.

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