A test device for a roller cone drill

Abstract

This utility model discloses a testing device for a roller cone drill in the field of engineering machinery testing technology. The device includes a roller cone drill, a tensile testing device, a torque testing device, a test line, and an industrial computer. The roller cone drill has a power head transition drill rod, a power head motor, a base, and a chuck. The tensile testing device is connected to the power head transition drill rod through its test drill rod. The upper surface of the sensor pull rod rigidly abuts against the lower surface of the base. The tensile sensor is connected to the industrial computer via the test line to collect the actual value of the winch lifting force. The anti-rotation device of the torque testing device is installed in the chuck slot. The torque sensor is connected to the industrial computer via the test line to collect the output torque of the power motor. This utility model can efficiently and accurately complete the static tensile and torque tests of the roller cone drill without actual drilling or building a dedicated test bench, significantly reducing costs and avoiding the risk of geological interference.

Description

Technical Field

[0001] This utility model relates to a testing device for a roller cone drill, belonging to the field of engineering machinery testing technology. Background Technology

[0002] As a type of engineering machinery, roller cone drilling rigs must undergo testing of two key indicators—the hoisting force and the output torque of the power head motor—according to national standards before being sold. The test results are compared with the design requirements to determine whether the roller cone drilling rig meets the design standards. Only roller cone drilling rigs that pass the tests are eligible for sale. Therefore, designing a working device and testing method for testing roller cone drilling rigs is imperative. However, the applicant's research has revealed the following problems when conducting tensile and torque tests in actual testing:

[0003] 1. Limitations of actual drilling and production testing: The test results of the roller cone drill rig are affected by the formation. That is, the harder the formation, the greater the torque and tension experienced by the roller cone drill rig. However, due to the large differences in different formation conditions, this method may not be able to measure the maximum torque and tension that the roller cone drill rig is designed to have. Therefore, it is impossible to accurately determine whether it fully meets the design requirements.

[0004] 2. Testing cost of test benches: Although it is possible to design a special test bench to test the torque and tensile force of roller cone drills, the cost of the test bench is very high, and its design and manufacturing cycle is also long. This will increase the company's cost and time investment to a certain extent, which is not conducive to the rapid production and sales of products.

[0005] Given the aforementioned limitations of both actual drilling and production testing and test bench testing, it is both necessary and urgent to design a working device and testing method for testing roller cone drilling rigs. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a roller cone drilling rig testing device that can solve the problems of unstable measurement results caused by geological interference in actual drilling tests, as well as the high cost and long cycle of test bench testing. It achieves efficient and low-cost verification of tensile force and torque through a modular static test structure.

[0007] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0008] A roller cone drill testing device is characterized in that it includes a roller cone drill, a test line, an industrial computer, and test components; the roller cone drill includes a power head transition drill rod, a power head motor, a base, and a chuck, and one end of the power head transition drill rod is connected to the output end of the power head motor;

[0009] When the test assembly is configured as a tensile testing device, the tensile testing device includes a test drill rod, a sensor pull rod, and a tensile sensor. The other end of the power head transition drill rod is connected to the test drill rod. The upper surface of the sensor pull rod rigidly abuts against the lower surface of the base. The tensile sensor is connected to the industrial computer through the test line.

[0010] When the test component is configured as a torque testing device, the torque testing device includes a test drill rod, an anti-rotation device, and a torque sensor. One end of the torque sensor is connected to the test drill rod, and the other end is connected to the anti-rotation device. The anti-rotation device is inserted into the slot of the chuck, and the torque sensor is connected to an industrial computer through a test lead.

[0011] Preferably, one end of the test drill rod is connected to the power head transition drill rod via a drill rod thread.

[0012] Preferably, the tensile testing device further includes a sensor upper pull rod, the other end of the test drill rod is connected to one end of the sensor upper pull rod, the other end of the sensor upper pull rod is connected to the upper end of the tensile sensor, and the lower end of the tensile sensor is connected to the sensor lower pull rod.

[0013] Preferably, the upper surface of the sensor pull rod is in rigid pressure contact with the lower surface of the base.

[0014] Preferably, the anti-rotation device is provided with a protrusion structure that matches the shape of the chuck groove, and the protrusion structure is embedded in the groove to form a circumferential limit.

[0015] Preferably, the rotary drill further includes a winch lifting mechanism, on which the end of a wire rope is fixed to the top of the power head transition drill rod.

[0016] Preferably, the tension sensor is calibrated using a standard sensor to test the hoisting force output by the hoisting mechanism.

[0017] Preferably, the range of the tension sensor is not less than the maximum value of the hoisting force.

[0018] Preferably, the torque sensor is calibrated using a standard sensor to test the torque output of the power head motor.

[0019] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0020] This invention utilizes a tensile testing device where the test drill rod is threadedly connected to the power head of a rotary drilling rig. Simultaneously, the sensor pull rod is tightly fitted against the lower surface of the equipment base. When the winch starts and generates an upward pulling force, this force is transmitted to the base via the pull rod. The tensile sensor collects data in real time and transmits it to an industrial computer via a test line, thus accurately obtaining the actual value of the winch's lifting force. Torque testing employs an anti-rotation device that is locked in place within the chuck's slot of the rotary drilling rig. When the power head motor outputs torque, the torque sensor directly measures the rotational resistance and synchronously transmits the signal to the industrial computer, quickly outputting the power head motor torque value. Attached Figure Description

[0021] Figure 1 This utility model provides a schematic diagram for tensile testing of a roller cone drill.

[0022] Figure 2 This utility model provides a schematic diagram for torque testing of a roller cone drill.

[0023] Figure 3 This is a schematic diagram of the installation of a tensile testing device for a roller cone drill rig provided by this utility model;

[0024] Figure 4 This utility model provides an installation diagram of a torque testing device for a roller cone drill.

[0025] In the diagram: 1. Roller drill; 2. Tensile testing device; 3. Test line; 4. Industrial computer; 5. Torque testing device; 101. Power head transition drill rod; 102. Power head motor; 103. Base; 104. Chuck; 201. Test drill rod; 202. First bolt; 203. First nut; 204. Sensor upper pull rod; 205. First pin; 206. First cotter pin; 207. Tensile sensor; 208. Second pin; 209. Second cotter pin; 210. Sensor lower pull rod; 501. Second bolt; 502. Second nut; 503. Torque sensor; 504. Third bolt; 505. Third nut; 506. Anti-rotation device. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Before a rotary drilling rig can be marketed, national standards require that its tensile and torque parameters be measured and compared with design parameters to determine if they meet design requirements. This determines the product's qualification and qualifies it for sale. However, traditional tensile and torque testing methods have several drawbacks: firstly, actual drilling testing is time-consuming and labor-intensive, easily wasting space resources, and due to geological conditions, it may not accurately measure the tensile and torque values ​​specified in the product design; secondly, using a test bench presents problems such as long design and manufacturing cycles and high costs. Example 1

[0030] See Figures 1 to 4 This utility model introduces a testing device for a roller cone drill, which achieves static testing of tensile force and torque through a specific structural connection relationship. The device includes a roller cone drill 1, a test line 3, an industrial computer 4, and alternative testing components (tensile force testing device 2 or torque testing device 5). Among them, the core components of the roller cone drill 1 include a power head transition drill rod 101, a power head motor 102, a base 103, and a chuck 104 with a slot. One end of the power head transition drill rod 101 is connected to the output end of the power head motor 102.

[0031] When testing tensile force, the testing assembly is configured as a tensile testing device 2, which includes a test drill rod 201, a sensor pull rod 210, and a tensile sensor 207. During the tensile test, the other end of the power head transition drill rod 101 is rigidly connected to the test drill rod 201. The upper surface of the sensor pull rod 210 rigidly abuts against the lower surface of the base 103, forming a reaction force support structure. The tensile sensor 207 is connected to an industrial computer 4 via a test line 3 to monitor the hoisting force in real time on the industrial computer 4. This structure directly bears the tensile force through the base 103, avoiding interference from the actual drilling formation and ensuring that the test values ​​accurately reflect the design parameters.

[0032] When testing torque, the testing assembly is configured as a torque testing device 5, which includes a test drill rod 201, an anti-rotation device 506, and a torque sensor 503. During torque testing, one end of the power head transition drill rod 101 is also connected to the test drill rod 201. One end of the torque sensor 503 is connected to the test drill rod 201, and the other end is connected to the anti-rotation device 506. The anti-rotation device 506 is embedded in the slot of the chuck 104 to achieve circumferential locking, thereby enabling the torque sensor 503 to collect and read the output torque of the power head motor 102 after being connected to the industrial computer 4 via the test line 3.

[0033] This device solves two major pain points of traditional testing:

[0034] 1. Alternative to actual drilling test: The rigid contact between the base 103 and the sensor pull rod 210 forms a closed force transmission path, eliminating the influence of formation hardness on the tensile force; the mechanical locking of the anti-rotation device 506 and the chuck 104 avoids the uncertainty of drilling rotation and ensures the stability of torque test.

[0035] 2. Reduced reliance on testing benches: The test drill pipe 201 can be reused to connect two types of testing devices, and combined with the unified signal processing of the industrial computer 4, the system complexity is significantly simplified. Tensile and torque testing components, such as the sensor pull rod 210 and the anti-rotation device 506, can be quickly assembled and disassembled through standardized mechanical interface threads and slots, greatly reducing equipment costs and manufacturing cycles.

[0036] Furthermore, the static testing protection mechanism extends equipment life while ensuring data accuracy by shortening test time (avoiding no-load damage to the hoisting mechanism during tensile testing) and limiting torque loading duration (ensuring the anti-rotation device withstands short-term loads). The integrated signal processing of the industrial computer further improves testing efficiency, forming a low-cost, high-reliability performance verification solution for rotary drilling rigs. Example 2

[0037] See Figures 2 to 4Based on the overall structure of the roller cone drill test device described in Example 1, this example further refines the specific connection relationships and configuration requirements of its key components. Specifically, one end of the test drill rod 201 is rigidly connected to the transition drill rod 101 of the power head of the roller cone drill 1 via a thread, while the other end is connected to the tensile testing device 2 or the torque testing device 5 via a thread, realizing the reuse of the test drill rod 201 in two testing modes.

[0038] The tensile testing device 2 further includes a sensor upper pull rod 204. One end of the sensor upper pull rod 204 is connected to the other end of the test drill rod 201 via a first bolt 202 and a first nut 203. The other end of the sensor upper pull rod 204 is connected to the upper end of the tensile sensor 207 via a first pin 205 and a first cotter pin 206. The lower end of the tensile sensor 207 is also connected to the sensor lower pull rod 210 via a radial hinge assembly (such as a second pin 208 and a second cotter pin 209). The upper surface of the sensor lower pull rod 210 maintains rigid pressure contact with the lower surface of the base 103 of the roller cone drill 1 to ensure effective transmission of tensile force.

[0039] For the torque testing device 5, one end of the torque sensor 503 is connected to the test drill rod 201 via a second bolt 501 and a second nut 502, while the other end is fixed to the anti-rotation device 506 via a third bolt 504 and a third nut 505. The anti-rotation device 506 is designed with a protrusion structure that precisely matches the shape of the chuck 104 of the roller cone drill 1. By embedding this protrusion structure into the chuck slot, circumferential limiting is achieved, effectively preventing the rotation of the anti-rotation device 506 during the test.

[0040] In a further embodiment of this utility model, the rotary drill 1 also includes a winch lifting mechanism, the end of which is fixed to the top of the power head transition drill rod 101. To ensure the accuracy and reliability of the test data, this embodiment also explicitly requires that the tension sensor 207 used for tensile testing and the torque sensor 503 used for torque testing be calibrated using standard sensors before use. After calibration, the winch lifting force output by the winch lifting mechanism and the torque output of the power motor 102 are tested respectively.

[0041] Furthermore, the range configuration of the force sensor 207 is greater than or equal to the expected maximum value of the hoisting force, ensuring that it can safely and accurately measure the target tension range. These specific connection structures, reuse designs, and pre-calibration requirements collectively enhance the device's testing accuracy, ease of operation, and structural reliability.

[0042] Working principle:

[0043] a. Tensile test:

[0044] The end of the wire rope of the winch lifting mechanism of the rotary drill rig 1 is fixed to the top of the power head transition drill rod 101. When the winch is started (the wire rope is tightened but the drill bit is not actually lifted), a static simulated tension is applied vertically upward to the power head transition drill rod 101.

[0045] The power head of the rotary drill 1 is rigidly connected to the test drill rod 201 of the tensile testing device 2 via the drill rod thread. At the same time, the upper surface of the sensor pull rod 210 of the tensile testing device 2 forms a rigid contact with the lower surface of the base 103 of the rotary drill 1.

[0046] The static simulated tension is transmitted to the tension sensor 207 through the test drill rod 201, and the reaction force is transmitted to the base 103 by the sensor pull rod 210, so that the tension sensor 207 outputs a tension signal. The tension signal is transmitted to the industrial computer 4 through the test line 3, and the real-time measurement value of the hoisting lifting force is displayed on the industrial computer 4. The measurement value is compared with the preset design value to determine whether the tension performance of the roller cone drill meets the design requirements.

[0047] b. Torque test:

[0048] The power head of the rotary drill 1 is rigidly connected to the test drill rod 201 of the torque testing device 5 through the drill rod thread, and the anti-rotation device 506 is embedded in the chuck 104 of the rotary drill 1 to achieve circumferential mechanical locking.

[0049] When the power head motor 102 starts (outputs torque but does not actually rotate the drill bit), the torque is transmitted to the test drill rod 201 through the power head transition drill rod 101 and acts on the torque sensor 503 connected to the test drill rod 201.

[0050] The circumferential constraint of the anti-rotation device 506 forces the torque to be completely converted into an electrical signal output from the torque sensor 503. This signal is transmitted to the industrial computer 4 via the test line 3. The real-time measured value of the output torque of the power head motor 102 is displayed on the screen of the industrial computer 4. This measured value is compared with the preset design value to determine whether the torque performance of the rotary drill meets the design requirements.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A drag bit testing device characterized by, It includes a roller cone drill (1), a test line (3), an industrial computer (4), and test components; the roller cone drill (1) includes a power head transition drill rod (101), a power head motor (102), a base (103), and a chuck (104), one end of the power head transition drill rod (101) being connected to the output end of the power head motor (102); When the test assembly is configured as a tensile testing device (2), the tensile testing device (2) includes a test drill rod (201), a sensor pull rod (210), and a tensile sensor (207). The other end of the power head transition drill rod (101) is connected to the test drill rod (201). The upper surface of the sensor pull rod (210) rigidly abuts against the lower surface of the base (103). The tensile sensor (207) is connected to the industrial computer (4) through the test line (3). When the test component is configured as a torque test device (5), the torque test device (5) includes a test drill rod (201), an anti-rotation device (506) and a torque sensor (503). One end of the torque sensor (503) is connected to the test drill rod (201), and the other end is connected to the anti-rotation device (506). The anti-rotation device (506) is inserted into the slot of the chuck (104). The torque sensor (503) is connected to the industrial computer (4) through the test line (3).

2. The drag bit testing device of Claim 1, wherein, One end of the test drill rod (201) is connected to the power head transition drill rod (101) via a drill rod thread.

3. The drag bit testing device of claim 2, wherein, The tensile testing device (2) further includes a sensor upper pull rod (204), the other end of the test drill rod (201) is connected to one end of the sensor upper pull rod (204), the other end of the sensor upper pull rod (204) is connected to the upper end of the tensile sensor (207), and the lower end of the tensile sensor (207) is connected to the sensor lower pull rod (210).

4. The drag bit testing device of claim 3, wherein, The upper surface of the sensor pull rod (210) is in rigid pressure contact with the lower surface of the base (103).

5. The drag bit testing device of Claim 1, wherein, The anti-rotation device (506) is provided with a protrusion structure that matches the shape of the slot of the chuck (104), and the protrusion structure is embedded in the slot to form a circumferential limit.

6. The drag bit testing device of Claim 1, wherein, The rotary drill (1) also includes a winch lifting mechanism, on which the end of a wire rope is fixed to the top of the power head transition drill rod (101).

7. The roller cone drill testing device according to claim 6, characterized in that, The tension sensor (207) is calibrated using a standard sensor to test the hoisting force output by the hoisting mechanism.

8. The roller cone drill testing device according to claim 7, characterized in that, The range of the tension sensor (207) is not less than the maximum value of the hoisting force.

9. The roller cone drill testing device according to claim 1, characterized in that, The torque sensor (503) is calibrated using a standard sensor to test the torque output of the power head motor (102).

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