A screw drill performance testing system and method

Abstract

This invention provides a screw drill performance testing system and method. The system includes a dynamometer, a reduction gearbox, a transmission box, and the screw drill to be tested, connected in sequence. The system also includes an axial pressure device, which is connected in sequence to a single-action pressure device, the transmission box, and the screw drill to be tested. When using the screw drill performance testing system of this invention, the influence of impact vibration on torque and rotational speed can be avoided, resulting in more accurate test results. The screw drill performance testing method of this invention can be used for performance testing of ordinary screw drills under load conditions without simulated drilling pressure and cyclic back pressure, as well as for screw drills under load conditions with simulated drilling pressure and cyclic back pressure, and has broad application and promotion prospects.

Description

Technical Field

[0001] This invention belongs to the field of performance testing technology for directional drilling equipment in coal mines, and relates to screw drills, specifically a screw drill performance testing system and method. Background Technology

[0002] Screw drills are a type of positive displacement downhole power drilling tool. They convert the hydraulic energy of drilling fluid into the mechanical energy of the drill bit, enabling rock-breaking drilling. They are widely used in directional drilling projects such as coal seam drilling, high-level roof drilling, floor grouting drilling, and floor drainage drilling. When drilling floor drainage holes, which are typically located in hard formations such as limestone or dense sandstone, conventional screw drills suffer from low drilling efficiency and short service life. Using screw drills, while simultaneously breaking the rock through rotation, pre-fractures the hard rock with a specific impact frequency and load, creating rock pits and micro-cracks, significantly improving rock-breaking efficiency.

[0003] Currently, the main standard for testing screw drill bits in China is the petroleum industry standard "SY / T5383-1999 Screw Drill Bits". The testing standard includes parameters such as the pressure of the input medium, the output torque of the screw drill bit, the output speed of the screw drill bit, the impact force, and the impact frequency.

[0004] However, the existing technology has the following drawbacks:

[0005] First, there is a lack of a testing device that combines torque and impact measurements for screw drills. Data obtained from simply testing torque or impact force under different conditions cannot adequately analyze the output characteristics of the screw drill. Furthermore, when simultaneously testing torque, speed, impact force, and impact frequency, the impact vibration affects torque and speed, leading to inaccurate test results.

[0006] Second, there is a lack of methods for testing the performance of screw drills under simulated drilling pressure, cyclic back pressure, and other load conditions. Summary of the Invention

[0007] In view of the defects and deficiencies of the existing technology, the purpose of this invention is to provide a screw drill performance testing system and method to solve the technical problem of inaccurate test results when testing multiple performance parameters of screw drills at the same time.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A screw drill performance testing system includes a dynamometer and a screw drill to be tested. The torque output end of the screw drill to be tested is connected to the torque input end of a transmission box. The torque output end of the transmission box is connected to the torque input end of a reduction gearbox. The torque output end of the reduction gearbox is connected to the torque input end of the dynamometer.

[0010] The transmission box includes a transmission box housing. A gearbox connecting gear shaft and a screw drill connecting gear shaft are rotatably mounted inside the transmission box housing. A gearbox connecting gear and a screw drill connecting gear are respectively mounted on the gearbox connecting gear shaft and the screw drill connecting gear shaft, and the gearbox connecting gear and the screw drill connecting gear mesh with each other. The gearbox connecting gear shaft is connected to the torque input end of the gearbox, and the screw drill connecting gear shaft is connected to the torque output end of the screw drill to be tested.

[0011] The present invention also has the following technical features:

[0012] Specifically, the transmission ratio between the gearbox connecting gear shaft and the screw drill connecting gear shaft is 1:1.

[0013] The screw drill performance testing system also includes an axial pressure device, the axial force output end of which is connected to the axial force input end of a single-action pressure device, and the axial force output end of the single-action pressure device is connected to the screw drill connecting gear shaft.

[0014] Specifically, the single-action pressurizing device includes a bearing sleeve, a front end cover is provided at one axial end of the bearing sleeve, a rear end cover is provided at the other axial end of the bearing sleeve, a pressurizing sleeve is fixed on the front end cover, the pressurizing sleeve and the bearing sleeve are coaxially arranged, and a pressurizing sleeve end cover is provided at one axial end of the pressurizing sleeve.

[0015] A thrust bearing assembly is installed inside the bearing sleeve. A pressure shaft is rotatably installed inside the thrust bearing assembly. A mandrel is fitted onto one axial end of the pressure shaft, and the mandrel is located inside the pressure sleeve. One axial end of the pressure shaft is flush with one axial end of the mandrel, and the other axial end of the pressure shaft extends out of the rear end cover and is connected to the gear shaft of the reduction gearbox.

[0016] Specifically, the torque input end of the reduction gearbox is connected to the torque output end of the transmission gearbox via the reduction gearbox torque transmission shaft; the torque input end of the transmission gearbox is connected to the screw drill bit to be tested via the transmission gearbox torque transmission shaft.

[0017] Specifically, the screw drill bit to be tested has a screw drill bit water outlet at one transverse end and a screw drill bit water inlet at the other transverse end; both axial ends of the torque transmission shaft of the transmission box are open; both axial ends of the pressure shaft and the mandrel are open, the opening at the other axial end of the pressure shaft is the water inlet of the pressure device, the space inside the pressure shaft is the water passage of the pressure shaft, and the pressure sleeve has a pressure device water outlet hole on the side wall near the axial end;

[0018] The space inside the screw drill bit under test, the space inside the torque transmission shaft of the transmission box, and the water passage of the pressurizing shaft are connected through the water outlet of the screw drill bit, the open axial ends of the torque transmission shaft of the transmission box, and the water inlet of the pressurizing device.

[0019] Specifically, the screw drill bit to be tested is fixed in a clamping device; the clamping device includes a clamping bracket, the top of which is provided with a screw drill bit clamp, the stator of the screw drill bit to be tested is fixed in the screw drill bit clamp, and the rotor of the screw drill bit to be tested is connected to the screw drill bit connecting gear shaft.

[0020] The screw drill performance testing system also includes a torque sensor for acquiring the torque and rotational speed output by the screw drill under test, and a piezoelectric sensor for acquiring the impact force and impact frequency output by the screw drill under test.

[0021] This invention also protects a method for testing the performance of a screw drill bit. This method employs the screw drill bit performance testing system described above, and specifically includes the following steps:

[0022] Step 1: Fix the screw drill to be tested using a clamping device, connect the screw drill to be tested to the screw drill connecting gear shaft, and after connection, input water into the screw drill to drive the rotor of the screw drill to be tested to rotate.

[0023] Step 2: After the rotor of the screw drill to be tested starts to rotate, start the dynamometer to begin the test; during the test, a torque sensor is used to obtain the torque and speed output by the screw drill to be tested, and a piezoelectric sensor is used to obtain the impact force and impact frequency output by the screw drill to be tested.

[0024] Step 3: After the test is completed, lower the dynamometer until the load is zero, then lower the simulated drilling pressure and circulating back pressure, stop water delivery, and the test is complete.

[0025] Optionally, step two can also be:

[0026] After the rotor of the screw drill bit to be tested starts to rotate, the simulated drilling pressure is first adjusted by the axial pressure device, the cyclic back pressure is adjusted by the single-action pressure device, and then the dynamometer is started to begin the test. During the test, the torque and speed output by the screw drill bit to be tested are obtained by the torque sensor, and the impact force and impact frequency output by the screw drill bit to be tested are obtained by the piezoelectric sensor.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] (I) The screw drill performance testing system of the present invention has two gear shafts in the transmission box. The gear shaft connected to the reduction gearbox is used for testing torque and speed, and the gear shaft connected to the screw drill is used for testing impact force and impact frequency. This arrangement can avoid the influence of impact vibration on torque and speed, making the test results more accurate.

[0029] (II) The screw drill performance testing system of the present invention realizes the application of simulated drilling pressure and cyclic back pressure to the screw drill to be tested through a transmission box, an axial pressure device and a single-action pressure device.

[0030] (III) The screw drill performance testing system of the present invention achieves accurate measurement of various performance parameters of the screw drill to be tested by setting a torque sensor and a piezoelectric sensor.

[0031] (IV) The screw drill performance testing method of the present invention can be used for performance testing of ordinary screw drills under load conditions such as no simulated drilling pressure and cyclic back pressure, as well as for performance testing of screw drills under load conditions such as simulated drilling pressure and cyclic back pressure, and has broad application and promotion prospects. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the screw drill performance testing system.

[0033] Figure 2 This is a front view of the screw drill performance testing system.

[0034] Figure 3 This is a schematic diagram of the transmission box.

[0035] Figure 4 This is a sectional view of the transmission box from plane AA.

[0036] Figure 5 This is a schematic diagram of a single-action pressurization device.

[0037] Figure 6 This is a cross-sectional view of the single-acting pressurization device from plane AA.

[0038] Figure 7This is a graph showing the changes in torque and rotational speed of the screw drill bit under test over time in Example 2.

[0039] Figure 8 This is a graph showing the changes in impact force and impact frequency of the screw drill bit under test over time in Example 2.

[0040] Figure 9 This is a graph showing the changes in the inlet temperature and inlet pressure of the high-pressure water over time in Example 2.

[0041] Figure 10 This is a graph showing the changes in outlet temperature and outlet pressure of the high-pressure water over time in Example 2.

[0042] Figure 11 This is a graph showing the change in the flow rate of high-pressure water over time in Example 2.

[0043] Figure 12 This is a graph showing the change in simulated drilling pressure over time in Example 2.

[0044] The meanings of the labels in the figure are as follows: 1-Dynamometer, 2-Gearbox, 3-Transmission box, 4-Screw drill bit to be tested, 5-Axial pressure device, 6-Single-action pressure device, 7-Gearbox torque transmission shaft, 8-Transmission box torque transmission shaft, 9-Clamping device, 10-Torque sensor, 11-Piezoelectric sensor, 12-Stop block, 13-Base;

[0045] 301 - Transmission box housing; 302 - Gear shaft connecting the gearbox; 303 - Gear shaft connecting the screw drill; 304 - Gear connecting the gearbox; 305 - Gear connecting the screw drill.

[0046] 601-Bearing sleeve, 602-Front end cover, 603-Rear end cover, 604-Pressure sleeve, 605-Pressure sleeve end cover, 606-Thrust bearing assembly, 607-Pressure shaft, 608-Mandrel, 609-Pressure device inlet, 610-Pressure shaft water passage, 611-Pressure device outlet;

[0047] 901-Clamping bracket, 902-Screw drill clamping.

[0048] The technical solution of the present invention will be further described below with reference to the embodiments. Detailed Implementation

[0049] It should be noted that all components used in this invention, unless otherwise specified, are components known in the art. For example, the gearbox torque transmission shaft 7 and the transmission shaft 8 are both motor connecting shafts known in the prior art.

[0050] In this invention:

[0051] The dynamometer 1 adopts an eddy current dynamometer known in the prior art, which generates torque through the vortex combination of eddy currents and electromagnetic induction magnetic field.

[0052] The screw drill tool 4 to be tested adopts a screw drill tool known in the prior art. The screw drill tool 4 to be tested includes a stator, a rotor, a universal joint assembly and a drive shaft assembly.

[0053] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0054] Example 1:

[0055] This embodiment provides a screw drill performance testing system, such as... Figure 1 and Figure 2 As shown, it includes a dynamometer 1 and a screw drill 4 to be tested. The torque output end of the screw drill 4 to be tested is connected to the torque input end of the transmission box 3. The torque output end of the transmission box 3 is connected to the torque input end of the reduction gearbox 2. The torque output end of the reduction gearbox 2 is connected to the torque input end of the dynamometer 1.

[0056] The transmission box 3 includes a transmission box body 301. A gearbox connecting gear shaft 302 and a screw drill connecting gear shaft 303 are rotatably mounted inside the transmission box body 301. A gearbox connecting gear 304 and a screw drill connecting gear 305 are respectively mounted on the gearbox connecting gear shaft 302 and the screw drill connecting gear shaft 303, and the gearbox connecting gear 304 and the screw drill connecting gear 305 mesh with each other. The gearbox connecting gear shaft 302 is connected to the torque input end of the gearbox 2, and the screw drill connecting gear shaft 303 is connected to the torque output end of the screw drill 4 to be tested.

[0057] In this embodiment, the screw drill 4 under test outputs torque under the action of high-pressure water, which passes sequentially through the transmission box 3, the reduction gearbox 2, and the dynamometer 1. The dynamometer 1 applies load to test the performance of the screw drill 4. Since the rotational speed range of the dynamometer 1 does not match the rotational speed of the screw drill 4 under test, the reduction gearbox 2 is needed to reduce the output rotational speed of the screw drill 4 under test to within the rotational speed range of the dynamometer 1.

[0058] In this embodiment, the screw drill connecting gear shaft 303 adopts a hollow gear shaft known in the prior art, and water can pass through the middle of the screw drill connecting gear shaft 303. The gearbox connecting gear shaft 302 adopts a splined gear shaft known in the prior art.

[0059] As a specific embodiment, the transmission ratio between the gearbox connecting gear shaft 302 and the screw drill connecting gear shaft 303 is 1:1.

[0060] In this embodiment, when the gearbox connecting gear shaft 302 is subjected to axial pressure, it will generate axial displacement and transmit axial pressure. Since the transmission ratio between the gearbox connecting gear shaft 302 and the screw drill connecting gear shaft 303 is 1:1, the input of the screw drill connecting gear shaft 303 is transmitted through the transmission box 3, and finally the torque and speed output through the gearbox connecting gear shaft 302 are the same as the torque and speed input through the screw drill connecting gear shaft 303. The data measured by the torque sensor 10 is the torque and speed of the screw drill 4 to be tested.

[0061] As a specific embodiment, the screw drill performance testing system further includes an axial pressure device 5, the axial force output end of the axial pressure device 5 is connected to the axial force input end of the single-action pressure device 6, and the axial force output end of the single-action pressure device 6 is connected to the screw drill connecting gear shaft 303.

[0062] In this embodiment, the single-acting pressurizing device 6 and the axial pressurizing device 5 are used to apply axial pressure to the screw drill 4 under test during testing. The axial pressurizing device 5 adopts a hydraulic rotary cylinder known in the prior art. The axial pressurizing device 5 includes a telescopic and rotatable shaft, and the shaft of the axial pressurizing device 5 rotates synchronously with the screw drill connecting gear shaft 303.

[0063] As one specific solution in this embodiment, such as Figure 5 and Figure 6 As shown, the single-action pressurizing device 6 includes a bearing sleeve 601, a front end cover 602 is provided at one axial end of the bearing sleeve 601, a rear end cover 603 is provided at the other axial end of the bearing sleeve 601, a pressurizing sleeve 604 is fixed on the front end cover 602, the pressurizing sleeve 604 is coaxially arranged with the bearing sleeve 601, and a pressurizing sleeve end cover 605 is provided at one axial end of the pressurizing sleeve 604;

[0064] A thrust bearing assembly 606 is installed inside the bearing sleeve 601. A pressure shaft 607 is rotatably installed inside the thrust bearing assembly 606. A spindle 608 is fitted onto one axial end of the pressure shaft 607. The spindle 608 is located inside the pressure sleeve 604. One axial end of the pressure shaft 607 is flush with one axial end of the spindle 608. The other axial end of the pressure shaft 607 extends out of the rear end cover 603 and is connected to the gear shaft 302 of the gearbox.

[0065] In this embodiment, the pressure shaft 607 and the spindle 608 can rotate synchronously. During the test, the pressure shaft 607 drives the spindle 608 to rotate, while the bearing sleeve 601, the front cover 602, the rear cover 603, the pressure sleeve 604, and the pressure sleeve end cover 605 do not rotate. The single-action pressure device 6 can ensure the accuracy of impact testing under axial load conditions.

[0066] As a specific embodiment, the torque input end of the reduction gearbox 2 is connected to the torque output end of the transmission gearbox 3 through the reduction gearbox torque transmission shaft 7; the torque input end of the transmission gearbox 3 is connected to the screw drill 4 to be tested through the transmission gearbox torque transmission shaft 8.

[0067] In this embodiment, the dynamometer 1, the gearbox 2, the single-action pressurizing device 6, and the axial pressurizing device 5 are all located on one side of the transmission box 3. The single-action pressurizing device 6 and the axial pressurizing device 5 are located longitudinally in front of the torque transmission shaft 7 of the gearbox. The torque transmission shaft 8 of the transmission box and the torque transmission shaft 7 of the gearbox are arranged in parallel. The screw drill 4 to be tested is located on the other side of the transmission box 3.

[0068] In this embodiment, when the performance of the screw drill 4 to be tested is carried out, the gearbox torque transmission shaft 7, the gearbox connecting gear shaft 302, the gearbox connecting gear 304, the pressure shaft 607 and the mandrel 608 rotate synchronously, and the screw drill connecting gear shaft 303, the screw drill connecting gear 305, the transmission box torque transmission shaft 8 and the rotor of the screw drill 4 to be tested rotate synchronously.

[0069] As one specific solution in this embodiment, such as Figure 6 As shown, the screw drill 4 to be tested has a screw drill water outlet at one transverse end and a screw drill water inlet at the other transverse end; both axial ends of the torque transmission shaft 8 of the transmission box are open; both axial ends of the pressure shaft 607 and the spindle 608 are open, the opening at the other axial end of the pressure shaft 607 is the pressure device water inlet 609, the space inside the pressure shaft 607 is the pressure shaft water passage 610, and the pressure sleeve 604 has a pressure device water outlet 611 on the side wall near one axial end;

[0070] The internal space of the screw drill 4 to be tested, the internal space of the torque transmission shaft 8 of the transmission box, and the water passage 610 of the pressurizing shaft are connected through the water outlet of the screw drill, the open axial ends of the torque transmission shaft 8 of the transmission box, and the water inlet 609 of the pressurizing device.

[0071] In this embodiment, high-pressure water is introduced into the screw drill 4 to be tested from the water inlet of the screw drill. After the high-pressure water flows out from the water outlet of the screw drill, it passes through the water passage inside the torque transmission shaft 8 of the transmission box and the water inlet 609 of the pressurizing device, enters the single-action pressurizing device 6, and then flows through the pressurizing shaft 607 and the mandrel 608 in sequence, and finally flows out from the water outlet 611 of the pressurizing device.

[0072] In this embodiment, circulating water is pre-stored in a water tank, which is equipped with a water delivery hose and a water recovery hose. The inlet end of the water delivery hose is connected to the water tank, and the outlet end is connected to the inlet of the high-pressure pump. The inlet end of the water recovery hose is connected to the outlet 611 of the pressurization device, and the outlet end is connected to the water tank. Using a high-pressure pump, water is drawn from the water tank through the water delivery hose, which drives the test screw drill 4. The water then returns to the high-pressure water tank through the screw drill outlet and the water recovery hose, thus conserving water resources.

[0073] In this embodiment, the axial pressurization device 5 is equipped with a back pressure regulator, which is used to adjust the output back pressure of the high-pressure water. The back pressure regulator adopts a conventional back pressure valve known in the prior art.

[0074] As a specific embodiment, the screw drill 4 to be tested is fixed in the clamping device 9; the clamping device 9 includes a clamping bracket 901, and a screw drill clamping 902 is provided on the top of the clamping bracket 901. The stator of the screw drill 4 to be tested is fixed in the screw drill clamping 902, and the rotor of the screw drill 4 to be tested is connected to the screw drill connecting gear shaft 303.

[0075] In this embodiment, the height of the clamping bracket 901 can be adjusted. The structure of the clamping bracket 901 adopts a conventional height-adjustable structure, such as a hydraulic telescopic rod. The clamping device 9 can ensure that the center heights of the screw drill tool 4 to be tested and the torque transmission shaft 8 of the transmission box are consistent.

[0076] In this embodiment, the screw drill clamping 902 adopts conventional clamping slips known in the prior art. The clamping slips with different clamping diameters are configured according to the outer diameter and bending angle of the screw drill 4 to be tested, which can ensure that the stator of the screw drill 4 to be tested is stably fixed in the screw drill clamping 902, and ensure that the axial load can be applied stably, thereby ensuring the reliability and safety of the performance test.

[0077] As a specific embodiment, the screw drill performance testing system further includes a torque sensor 10 for acquiring the torque and rotational speed output by the screw drill 4 under test, and a piezoelectric sensor 11 for acquiring the impact force and impact frequency output by the screw drill 4 under test.

[0078] In this embodiment, the torque sensor 10 and the piezoelectric sensor 11 are both known in the prior art. The torque sensor 10 is connected to the torque transmission shaft 7 of the reduction gearbox, and the piezoelectric sensor 11 is mounted on the axial pressing device 5. The signal output terminals of the torque sensor 10 and the piezoelectric sensor 11 are connected to a signal analysis system. This signal analysis system is a known prior art system that can record the data acquired by the torque sensor 10 and the piezoelectric sensor 11 in real time and generate corresponding data curves.

[0079] As a specific solution in this embodiment, a stop block 12 is provided at one lateral end of the axial pressing device 5, and the stop block 12 plays a role in fixing and limiting the axial pressing device 5.

[0080] In this embodiment, the dynamometer 1, the gearbox 2, the transmission box 3, the clamping device 9, the stop block 12, and the torque sensor 10 are all mounted on the base 13. The base 13 is provided with a gearbox base, a transmission box base, and a torque sensor base. The gearbox base, the transmission box base, and the torque sensor base are used to fix the gearbox 2, the transmission box 3, and the torque sensor 10, respectively.

[0081] Example 2:

[0082] This embodiment provides a method for testing the performance of screw drill bits. The method uses the screw drill bit performance testing system described in Embodiment 1, and specifically includes the following steps:

[0083] Step 1: Fix the screw drill 4 to be tested using the clamping device 9, connect the screw drill 4 to the screw drill connecting gear shaft 303, and after connection, input high-pressure water into the screw drill 4 to drive the rotor of the screw drill 4 to rotate.

[0084] In this embodiment, before inputting high-pressure water, the input flow rate of the high-pressure water needs to be set according to the specifications of the screw drill bit 4 to be tested. The parameter change curve of the high-pressure water over time is shown in the figure. Figures 9 to 11 As shown.

[0085] Step two: After the rotor of the screw drill 4 to be tested begins to rotate, the simulated drilling pressure is first adjusted using the axial pressure device 5, and the cyclic back pressure is adjusted using the single-action pressure device 6. Then, the dynamometer 1 is started to apply load until the rated output torque of the screw drill 4 to be tested is reached, and then the test is stabilized for 10 minutes. During the test, the torque and rotational speed output by the screw drill 4 to be tested are obtained using the torque sensor 10, and the impact force and impact frequency output by the screw drill 4 to be tested are obtained using the piezoelectric sensor 11.

[0086] In this embodiment, the simulated drilling pressure versus time curve is as follows: Figure 12 As shown.

[0087] Step 3: After the test is completed, reduce the dynamometer 1 until the load is zero, then reduce the simulated drilling pressure and circulating back pressure, stop the delivery of high-pressure water, and the test is completed.

[0088] In this embodiment, the performance parameter curves of the screw drill 4 to be tested are as follows: Figure 7 and Figure 8 As shown.

Claims

1. A screw drill performance testing system, comprising a dynamometer (1) and a screw drill to be tested (4), characterized in that, The torque output end of the screw drill bit (4) to be tested is connected to the torque input end of the transmission box (3), the torque output end of the transmission box (3) is connected to the torque input end of the reduction gearbox (2), and the torque output end of the reduction gearbox (2) is connected to the torque input end of the dynamometer (1). The transmission box (3) includes a transmission box body (301), in which a gearbox connecting gear shaft (302) and a screw drill connecting gear shaft (303) are rotatably installed. A gearbox connecting gear (304) and a screw drill connecting gear (305) are respectively installed on the gearbox connecting gear shaft (302) and the screw drill connecting gear shaft (303), and the gearbox connecting gear (304) and the screw drill connecting gear (305) mesh with each other. The gearbox connecting gear shaft (302) is connected to the torque input end of the gearbox (2), and the screw drill connecting gear shaft (303) is connected to the torque output end of the screw drill (4) to be tested. It also includes an axial pressure device (5), the axial force output end of the axial pressure device (5) is connected to the axial force input end of the single-action pressure device (6), and the axial force output end of the single-action pressure device (6) is connected to the screw drill connecting gear shaft (303). The single-action pressurizing device (6) includes a bearing sleeve (601), a front end cover (602) is provided at one axial end of the bearing sleeve (601), a rear end cover (603) is provided at the other axial end of the bearing sleeve (601), a pressurizing sleeve (604) is fixed on the front end cover (602), the pressurizing sleeve (604) is coaxially arranged with the bearing sleeve (601), and a pressurizing sleeve end cover (605) is provided at one axial end of the pressurizing sleeve (604). A thrust bearing assembly (606) is installed inside the bearing sleeve (601), and a pressure shaft (607) is rotatably installed inside the thrust bearing assembly (606). A mandrel (608) is fitted onto one axial end of the pressure shaft (607), and the mandrel (608) is located inside the pressure sleeve (604). One axial end of the pressure shaft (607) is flush with one axial end of the mandrel (608), and the other axial end of the pressure shaft (607) extends out of the rear end cover (603) and is connected to the gear shaft (302) of the gearbox. The torque input end of the gearbox (2) is connected to the torque output end of the transmission box (3) through the gearbox torque transmission shaft (7); the torque input end of the transmission box (3) is connected to the screw drill (4) to be tested through the transmission box torque transmission shaft (8). The screw drill bit (4) to be tested has a screw drill bit outlet at one transverse end and a screw drill bit inlet at the other transverse end; both axial ends of the torque transmission shaft (8) of the transmission box are open; both axial ends of the pressure shaft (607) and the mandrel (608) are open, the opening at the other axial end of the pressure shaft (607) is the pressure device inlet (609), the space inside the pressure shaft (607) is the pressure shaft water passage (610), and the pressure sleeve (604) has a pressure device outlet hole (611) on the side wall near one axial end. The space inside the screw drill bit (4) to be tested, the space inside the torque transmission shaft (8) of the transmission box, and the water passage (610) of the pressurizing shaft are connected through the water outlet of the screw drill bit, the open axial ends of the torque transmission shaft (8) of the transmission box, and the water inlet (609) of the pressurizing device.

2. The screw drill performance testing system as described in claim 1, characterized in that, The transmission ratio between the gearbox connecting gear shaft (302) and the screw drill connecting gear shaft (303) is 1:

1.

3. The screw drill performance testing system as described in claim 2, characterized in that, The screw drill bit (4) to be tested is fixed in the clamping device (9); the clamping device (9) includes a clamping bracket (901), and a screw drill bit clamping device (902) is provided on the top of the clamping bracket (901). The stator of the screw drill bit (4) to be tested is fixed in the screw drill bit clamping device (902), and the rotor of the screw drill bit (4) to be tested is connected to the screw drill bit connecting gear shaft (303).

4. The screw drill performance testing system as described in claim 3, characterized in that, It also includes a torque sensor (10) for acquiring the torque and rotational speed output by the screw drill (4) under test, and a piezoelectric sensor (11) for acquiring the impact force and impact frequency output by the screw drill (4) under test.

5. A method for testing the performance of a screw drill bit, characterized in that, The method using the screw drill performance testing system as described in any one of claims 1 to 4 specifically includes the following steps: Step 1: Use clamping device (9) to fix the screw drill (4) to be tested, and connect the screw drill (4) to the screw drill connecting gear shaft (303). After connection, input water into the screw drill (4) to drive the rotor of the screw drill (4) to rotate. Step 2: After the rotor of the screw drill (4) to be tested starts to rotate, start the dynamometer (1) to start the test; during the test, the torque and speed output by the screw drill (4) to be tested are obtained by the torque sensor (10), and the impact force and impact frequency output by the screw drill (4) to be tested are obtained by the piezoelectric sensor (11). Step 3: After the test is completed, reduce the dynamometer (1) until the load is zero, then reduce the simulated drilling pressure and circulating back pressure, stop the water supply, and complete the test.

6. The screw drill performance testing method as described in claim 5, characterized in that, The second step is as follows: After the rotor of the screw drill (4) to be tested starts to rotate, the simulated drilling pressure is first adjusted by the axial pressure device (5), the cyclic back pressure is adjusted by the single-action pressure device (6), and then the dynamometer (1) is started to start the test. During the test, the torque and speed output by the screw drill (4) to be tested are obtained by the torque sensor (10), and the impact force and impact frequency output by the screw drill (4) to be tested are obtained by the piezoelectric sensor (11).

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