Reducing and speed-increasing type drilling tool check valve erosion resistance simulation detection test bed

Abstract

A diameter-reducing speed-increasing type drilling tool check valve erosion resistance simulation detection test bed belongs to the field of drilling tool check valve erosion resistance detection, and comprises a mortar box, a circulating pipeline, a mortar pump, a motor, a stirrer and a drainage sleeve, and further comprises a check valve loading vehicle, the upper end face of the mortar box is a detection working platform provided with a backflow window and a stirrer, a flow guide hole is formed in the bottom of the mortar box, the drainage end of the circulating pipeline is connected and communicated with the flow guide hole, the erosion end of the circulating pipeline is arranged on the upper portion of the backflow window, and a mortar pump driven by a motor is connected in the circulating pipeline. The circulating pipeline is a variable-diameter pipeline with the diameter gradually reduced from the flow guide end to the erosion end, gradient reduction of the flux of the circulating pipeline can assist the mortar pump to regulate and control the flowing speed of liquid mortar, the reliability of liquid mortar flow speed control and the stability of liquid flow flowing are improved, the liquid flow speed increasing efficiency is improved, the operation power is reduced, and the operation cost is reduced. The working efficiency is improved, the operation efficiency can be further improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the field of erosion resistance performance detection of drill string check valves, and particularly relates to a simulation detection test bench for erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve. Background Technique

[0002] A drill string check valve is a special downhole device that prevents high-pressure formation fluids and drilling fluids from surging upwards inside the drill string in the field of oil and gas drilling production. It can conduct unidirectional flow under the action of circulating well fluid. Since the flow rate of the circulating well fluid pumped at the wellhead during the drilling process is relatively large, the sandy particles in the circulating well fluid continuously impact the valve core in the check valve at high speed. At the same time, the chemical components therein also continuously corrode and damage it, resulting in the frequent erosion and damage of the check valve core and thus the loss of its safety protection function. In order to fully understand the erosion mechanism of the circulating well fluid on the check valve core, provide a scientific basis for optimizing and improving the structural function of the check valve core, and effectively enhancing the erosion resistance performance of the check valve core, it is necessary to conduct necessary erosion resistance detection tests on the drill string check valve in production and scientific research activities. At present, the detection methods for the erosion resistance performance of drill string check valves are all to use a high-power motor to drive a mud pump to simulate the flow state of downhole circulating well fluid in a production test environment, continuously impact the check valve core under the simulated test state, observe the test process, and collect detection data. However, due to the generally large power of the supporting devices of this detection method, high energy consumption, obvious problems such as serious equipment wear, too high operating costs, and low work efficiency in the use process, and the tooling support is not complete enough. Especially under the test requirement that the check valve needs to be vertically connected to the lower end of the circulating fluid pipeline, due to the large difficulty of the hoisting operation process, the check valve is usually manually carried and moved and manually connected and installed to the circulating fluid pipeline, which also has the disadvantages of high labor intensity and low installation efficiency. Therefore, it is necessary to study and improve the erosion resistance simulation detection test device for drill string check valves in the existing technology, optimize the design structure function, improve the liquid flow speed increasing efficiency, improve the supporting operation tooling, and improve the simulation degree of the simulation environment to ensure the accuracy of the test results. Content of the Utility Model

[0003] The purpose of the utility model is to provide a simulation detection test bench for erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve, optimize the design structure function, improve the liquid flow speed increasing efficiency, and improve the supporting operation tooling.

[0004] A simulation test bench for erosion resistance performance of a reduced-diameter and speed-increasing drill string check valve, comprising: a mortar box, a circulation pipeline, a mortar pump, an electric motor, a mixer and a drainage sleeve. The mortar box is a container for liquid mortar and is equipped with the mixer for mixing the liquid mortar. The liquid mortar is an erosion test liquid specially prepared by simulating the composition of the mud used in oilfield production in the detection environment. The upper end face of the mortar box is a detection working platform, on which a reflux window is opened. At the same time, a diversion hole is opened at the bottom of one side end of the mortar box. The reflux window and the diversion hole are respectively opened on the opposite sides of the mortar box corresponding to each other. The circulation pipeline is a circulation diversion channel for the liquid mortar, with one end being the drainage end, connected and communicated with the diversion hole, and the other end being the erosion end, correspondingly arranged above the reflux window. A threaded joint is installed at the end of the erosion end, and the threaded joint can be connected and communicated with the upper end of the check valve to be detected and keep the check valve to be detected vertically arranged to simulate the spatial state of the check valve to be detected during downhole operation. The drainage sleeve can be connected and communicated with the lower end of the check valve to be detected. In the connected state, the sleeve extends into the mortar box from the reflux window, so that the circulation pipeline, the check valve to be detected and the drainage sleeve are combined to form a closed loop for the circulation of the liquid mortar separated from the external environment. A mortar pump is connected in the circulation pipeline, and the mortar pump is driven by the electric motor to pump the liquid mortar from the mortar box into the circulation pipeline and form a circulating erosion liquid flow outside the mortar box. The circulation pipeline is a variable-diameter pipeline, and the pipeline diameter decreases step by step from the drainage end to the erosion end, so that the liquid mortar pumped into the circulation pipeline can increase the flow rate as the aperture of the flowing area decreases, and finally be injected into the check valve to be detected in the form of a high-speed jet at the erosion end, eroding the inner cavity of the check valve to be detected and the valve core installed in the inner cavity of the check valve to be detected, and simulating and constructing the environmental state of the check valve to be detected under the erosion of the mud during downhole operation.

[0005] The simulation detection test bench for the erosion resistance performance of the reduced-diameter and speed-increasing type drill tool check valve further includes: a check valve loading vehicle, a guide rail, and a limit post arranged on the detection work platform; the check valve loading vehicle specifically includes: a vehicle body, wheels, a bearing seat, a lead screw, a nut sleeve, and a thrust bearing. The wheels are connected and installed on the vehicle body. The bearing seat and the nut sleeve are annular sleeves with corresponding structures. An internal thread is provided on the inner ring surface of the nut sleeve. The bearing seat is fixedly installed on the vehicle body. The nut sleeve is coaxially stacked on the bearing seat supported by the thrust bearing, enabling the nut sleeve to rotate axially relative to the bearing seat. The lead screw is inserted and fitted into the central axis holes of the nut sleeve and the bearing seat, and an external thread is provided on the outer circumference. The external thread corresponds to and is connected in cooperation with the internal thread provided on the nut sleeve. The lower end is circumferentially limited by the bearing seat to restrict the rotation of the lead screw relative to the bearing seat. By using the nut-screw matching structure between the nut sleeve and the lead screw, the lead screw can be axially lifted or lowered relative to the bearing seat by turning the nut sleeve. A supporting mechanism is provided at the upper end of the lead screw. The supporting mechanism corresponds to and cooperates with the structure at the lower end of the detection check valve, enabling the lead screw to stably and reliably vertically support the detection check valve. The guide rail is a limiting track corresponding to the structure of the vehicle body, defining the movement track of the check valve loading vehicle from the loading station of the detection check valve to the detection station. The limit post is arranged corresponding to the guide rail and can position the valve loading vehicle moved to the detection station at the detection station. At the detection station, the lead screw is perpendicular and coaxial with the threaded joint installed on the erosion end of the circulating pipeline.

[0006] In the simulation detection test bench for the erosion resistance performance of the reduced-diameter and speed-increasing type drill tool check valve, preferably, a supporting ring is detachably sleeved on the upper end of the lead screw. The outer circumference of the supporting ring forms an insertion fit with the central axis hole at the lower end of the detection check valve. The lead screw and the supporting ring are combined to form a supporting mechanism for the detection check valve, which can stably and reliably support the detection check valve. When damaged by impact or wear, only the supporting ring needs to be replaced, which can not only reduce cost consumption, but also disassemble and assemble relevant components, shorten the tooling maintenance time, and improve the detection work efficiency.

[0007] In the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve, preferably, a filter screen box is installed in the mortar box. The filter screen box entirely encloses the diversion holes communicating with the circulation pipeline to filter the liquid mortar pumped into the circulation pipeline, preventing large particle impurities or sundries accidentally mixed in the mortar box from entering the circulation pipeline, changing the simulation state of the liquid mortar, and having an adverse impact on the accuracy and reliability of the simulation detection test data of the erosion resistance performance of the drill tool check valve.

[0008] In the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve, preferably, an image monitoring head is installed in the detection check valve. The image monitoring head is arranged above the valve core installed in the inner cavity of the detection check valve. By means of external equipment, the working state of the valve core under the erosion action of the liquid mortar and the dynamic damage process of the inner cavity of the detection check valve and the valve core caused by the erosion action are monitored and recorded in real time, providing a reference basis for the improvement of the structure and performance of the detection check valve.

[0009] In the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve, preferably, a flow velocity sensor is installed in the circulation pipeline. The flow velocity sensor is arranged in the port area of the erosion end of the circulation pipeline to dynamically monitor the flow velocity of the liquid mortar in the erosion end of the circulation pipeline, and adjust and control the circulating flow velocity of the liquid mortar according to the monitoring parameters, ensuring the simulated flow state of the liquid mortar and meeting the environmental condition requirements for the detection of the erosion resistance performance of the detection check valve.

[0010] The beneficial effects of the present utility model are as follows: a simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve is provided, with optimized design structure and functions. A liquid mortar circulation pipeline with variable pore diameters is adopted, and the principle that the gradient reduction of the circulation pipeline flux can increase the flow velocity of the liquid mortar is utilized to assist the mortar pump in adjusting and controlling the flow velocity of the liquid mortar, changing the adverse situation that the adjustment and control of the liquid mortar flow velocity completely depend on the operating power of the mortar pump. It can effectively improve the reliability of the liquid mortar flow velocity control and the stability of the liquid mortar flow, improve the liquid flow velocity increasing efficiency of the liquid mortar, reduce the operating power of the mortar pump, reduce the operating cost, and improve the work efficiency. Further, the loading and unloading operation tooling of the detection check valve is improved. The specially equipped check valve loading vehicle can not only vertically transport the detection check valve and accurately position it at the detection station of the working platform, but also directly assist in installing the detection check valve onto the circulation pipeline or disassembling and separating it from the circulation pipeline at the detection station, replacing the manual operation of the staff, significantly improving the operation efficiency, reducing the labor intensity, and achieving the purpose of the present utility model. Description of the Drawings

[0011] Figure 1It is the overall structure diagram of the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve.

[0012] Figure 2 It is the structure diagram for testing the installation state of the check valve in the check valve installation area of the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve.

[0013] Figure 3 It is the side view of the structure for testing the installation state of the check valve of the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve.

[0014] Figure 4 It is Figure 3 The partial enlarged view at position I in

[0015] Figure 5 It is the structure diagram of the check valve to be installed in the check valve installation area of the simulation detection test bench for the erosion resistance performance of the reducing-diameter and speed-increasing type drill tool check valve.

[0016] Wherein: 1 is the mortar box, 2 is the circulation pipeline, 3 is the mortar pump, 4 is the electric motor, 5 is the mixer, 6 is the drainage sleeve, 7 is the threaded joint, 8 is the guide rail, 9 is the limit post, 10 is the check valve loading vehicle, 11 is the vehicle body, 12 is the wheel, 13 is the bearing seat, 14 is the screw lever, 15 is the screw nut sleeve, 16 is the thrust bearing, 17 is the supporting ring, 18 is the anti-rotation pin, 19 is the turning slot hole, 20 is the detection check valve, 21 is the filter box, 22 is the image monitoring head, 23 is the flow velocity sensor, 24 is the structural frame, 25 is the fixed clamping ring, 26 is the mounting seat, 27 is the hand-operated valve, 28 is the valve core. Specific implementation mode

[0017] Furthermore, in combination with specific embodiments and their accompanying drawings, the technical solutions claimed in the present invention are specifically described.

[0018] A kind of erosion detection test bench for the reducing-diameter and speed-increasing type drill tool check valve, as Figures 1 to 5 shown, is composed of the mortar box 1, the circulation pipeline 2, the mortar pump 3, the electric motor 4, the mixer 5, the drainage sleeve 6 and the check valve loading vehicle 10.

[0019] The mortar box 1 is a cubic container. Its upper end face serves as the detection working platform, and it contains liquid mortar inside. The liquid mortar is prepared from sand and thickening water. The mixer 5 is installed on the working platform to mix and stir the liquid mortar. In the detection station on the working platform surface, a return window is opened and two double-sided limiting guide rails 8 corresponding to the position of the return window are arranged. At the same time, a diversion hole is opened at the bottom of one side end of the mortar box 1. The return window and the diversion hole are respectively opened on the longitudinal opposite sides of the mortar box 1 body. A filter screen box 21 is installed on the diversion hole inside the mortar box 1; The circulation pipeline 2 is supported by the structural frame 24 and arranged above the working platform. The drainage end is connected and conducted with the diversion hole. The erosion end is positioned and arranged above the return window, and the port is vertically downward and corresponds to the return window. A threaded joint 7 that can be threadedly fitted and connected to the upper end of the detection check valve 20 is installed at the end. At the same time, a fixed clamping ring 25 is correspondingly installed on the structural frame 24. The fixed clamping ring 25 can cooperate with and fixedly clamp the detection check valve 20 on the threaded joint 7 to improve the connection firmness of the detection check valve 20. The pipe body of the circulation pipeline 2 is composed of three sections: a large-diameter section A, a medium-diameter section B, and a small-diameter section C. The large-diameter section A, the medium-diameter section B, and the small-diameter section C are arranged in sequence from the drainage end to the erosion end, and the pipe diameters of each diameter section decrease in a stepped manner. The mortar pump 3 is connected to the circulation pipeline 2 at the drainage end and is powerfully connected to the motor 4 and driven by the motor 4. At the same time, an image monitoring head 22 and a flow velocity sensor 23 are respectively installed in the small-diameter section C of the circulation pipeline 2; The drainage sleeve 6 can be threadedly fitted and connected to the lower end of the detection check valve 20, and guide the liquid mortar that highly erodes the detection check valve 20 back to the mortar box 1 through the return window; The check valve loading vehicle 10, such as Figure 4As shown, it is composed of a vehicle body 11, wheels 12, a bearing seat 13, a lead screw 14, a nut sleeve 15, a thrust bearing 16 and a supporting ring 17. The vehicle body 11 is rectangular in shape, and its lateral width corresponds to the distance between the two guide rails 8 arranged on the working platform and is bilaterally limited and arranged between the two guide rails 8 in a matching manner. Four wheels 12 are installed at the bottom. The bearing seat 13 is vertically fixedly installed on the vehicle body 11. The outer circumferential surface of the nut sleeve 15 has a turning slot hole 19, and an internal thread is provided on the inner circumferential surface. It is stacked on the bearing seat 13 in a matching manner. The thrust bearing 16 is arranged between the nut sleeve 15 and the bearing seat 13, so that the nut sleeve 15 can axially rotate relative to the bearing seat 13. The outer circumferential surface of the lead screw 14 is provided with an external thread and an anti-rotation groove arranged axially, and it is inserted into the central axis holes of the nut sleeve 15 and the bearing seat 13 in a matching manner. Through the corresponding cooperation between the external thread on the outer circumferential surface and the internal thread on the inner circumferential surface of the nut sleeve 15, a nut-screw rod matching structure is formed with the nut sleeve 15. At the same time, the anti-rotation of the lead screw 14 relative to the bearing seat 13 is restricted by the inlay limit cooperation between the anti-rotation pin 18 installed on the bearing seat 13 and the anti-rotation groove opened on the lead screw 14. The supporting ring 17 is fitted over the upper end of the lead screw 14, and the detection check valve 20 is carried and transported through the supporting ring 17. The front column of the structure frame 24 can also be used as the limit column 9 at the same time, and it cooperates with the two guide rails 8 to position the check valve loading vehicle 10 at the detection station and perform the connection operation between the detection check valve 20 and the circulation pipeline 2 at the detection station.

[0020] To detect the erosion resistance performance of the drill tool check valve using the erosion resistance performance simulation detection test bench for the reduced-diameter and increased-speed drill tool check valve described in this embodiment, the specific operation steps are as follows:

[0021] Step 1. Place the check valve loading vehicle 10 at the loading station on the working platform of the erosion resistance performance simulation detection test bench for the reduced-diameter and increased-speed drill tool check valve. Insert a turning rod with a corresponding structure into the turning slot hole 19 opened on the outer circumference of the nut sleeve 15, and use the turning rod to turn the nut sleeve 15. Adjust the lead screw 14 downward to the lowest position through the nut-screw rod structure cooperation between the nut sleeve 15 and the lead screw 14. As Figure 4 shown, fit the supporting ring 17 over the upper end of the lead screw 14. Install the flow velocity sensor 23 on the mounting seat 26 in advance, check the installation status of the filter screen box 21 and the closed state of the hand-operated valve, heat the liquid mortar to the set temperature of the detection test (between 16°C and 82°C), and complete the basic preparation work for the detection test;

[0022] Step 2. Lift the inspection check valve 20 vertically to the loading station area, align the lower end of the inspection check valve 20 with the supporting ring 17 and slowly lower it so that the inspection check valve 20 fits in the set and is carried on the supporting ring 17 at the same time. After ensuring that the inspection check valve 20 is stably loaded, remove the lifting tool, and then gently push the check valve loading vehicle 10 to move along the limited track of the guide rail 8, transfer the check valve loading vehicle 10 to the inspection station and limit it to be positioned in the inspection station by the limit column 9. At this time, Figure 2 As shown, the wire lever 14 and the support ring 17 are vertically coaxial with the threaded joint 7 installed on the erosion end of the circulation pipeline 2;

[0023] Step 3. Pull the turning rod in the opposite direction to turn the screw nut sleeve 15, lift the screw lever 14 and the detection check valve 20 carried on the screw lever 14, until the upper end of the detection check valve 20 is connected with the threaded joint 7, and then rotate the detection check valve 20 body to make the detection check valve 20 and the threaded joint 7 threadedly matched and connected. During the rotation connection process, the detection check valve 20 is gradually lifted upward and separated from the supporting ring 17. When the detection check valve 20 and the threaded joint 7 are fully matched and firmly connected, as shown in FIG. Figure 1 and Figure 5 As shown, the valve body of the detection check valve 20 is fixedly clamped by a fixing clamp ring 25, and the detection check valve 20 is fixed on the structural frame 24. The screw nut sleeve 15 is turned by the turning rod again to adjust the screw lever 14 downward to the lowest position, so that the supporting ring 17 can be completely disengaged from the lower end of the detection check valve 20. Then, the check valve loading vehicle 10 is pulled back from the detection station to the loading station to complete the installation of the detection check valve 20.

[0024] Step 4. Install the image monitoring head 22 on the mounting seat ##, connect the image monitoring head 22 and the pre-installed flow rate sensor 23 to the external image display and information acquisition instrument respectively, and after confirming that the image monitoring head 22 and the flow rate sensor 23 are working properly, connect the drainage sleeve 6 to the lower end of the detection check valve 20, and open the hand valve 27 at the same time to complete the preparation work for starting operation;

[0025] Step 5. First, start the mixer 5 to stir the liquid mortar contained in the mortar box 1. After pre-stirring for 10 minutes, while keeping the mixer 5 running continuously, start the motor 4 to drive the mortar pump 3 to operate, and drive the liquid mortar to establish a circulating liquid flow in the circulation pipeline 2. Use the flow velocity sensor 23 to detect the flow velocity of the liquid mortar in the small-diameter section C of the circulation pipeline 2. When the flow velocity reaches the test design value (above 6.1 m / s), the test officially starts and the circulation time of the liquid mortar is recorded starting from this point. During the test, the flow velocity and temperature of the liquid mortar should be maintained, and the structure and working state of the valve core of the detection check valve 20 should be observed in real time through the image monitoring head 22. The test duration is usually more than 200 hours. During this period, when obvious structural damage or loss of function of the valve core of the detection check valve 20 is observed through the image monitoring head 22, the detection test process can be stopped immediately. Then, stop the motor 4 and the mixer 5 in sequence to terminate the liquid flow circulation of the liquid mortar. After closing the hand-operated valve 27, disassemble and pull out the image monitoring head 22 from the mounting seat 26;

[0026] Step 6. After removing the drainage sleeve 6 from the detection check valve 20, push the check valve loading vehicle 10 from the loading station to the detection station again. Use the turning lever to turn the nut sleeve 15 so that the screw lever 14 is lifted upward until the supporting ring 17 correspondingly extends into the central shaft hole of the detection check valve 20. Then, remove the fixed clamping ring 25 and loosen the connection with the structure frame 24. Subsequently, turn the body of the detection check valve 20 and continue to turn the supporting ring 17 in cooperation to loosen the threaded connection and cooperation between the detection check valve 20 and the threaded joint 7 until it is completely separated from the threaded joint 7 and at the same time is stably supported on the supporting ring 17. After determining that the detection check valve 20 and the supporting ring 17 are firmly matched, pull the check valve loading vehicle 10 back to the loading station smoothly from the detection station. Finally, use a lifting tool to lift the detection check valve 20 from the loading station for further structural performance analysis. Thus, the detection test of one detection check valve 20 is completed.

Claims

1. A simulation detection test bench for the erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve, characterized in that, Including: A mortar box (1), a circulation pipeline (2), a mortar pump (3), an electric motor (4), a mixer (5) and a drainage sleeve (6). The mortar box (1) is a container for liquid mortar and is equipped with the mixer (5) for mixing the liquid mortar. The upper end surface of the mortar box (1) is a detection working platform. A return window is provided on the detection working platform. At the same time, a diversion hole is provided at the bottom of one side end of the mortar box (1). The return window and the diversion hole are respectively provided on the opposite sides of the mortar box (1). The circulation pipeline (2) is a circulation diversion channel for the liquid mortar. One end is a drainage end, which is connected and communicated with the diversion hole. The other end is an erosion end, which is correspondingly arranged above the return window. A threaded joint (7) is installed at the end of the erosion end. The threaded joint (7) can be cooperatively connected and communicated with the upper end of the detection check valve (20) and keep the detection check valve (20) vertically arranged. The drainage sleeve (6) can be cooperatively connected and communicated with the lower end of the detection check valve (20). In the connected state, the sleeve extends into the mortar box (1) from the return window, so that the circulation pipeline (2), the detection check valve (20) and the drainage sleeve (6) are combined to form a closed loop for the circulation of the liquid mortar separated from the external environment. A mortar pump (3) is connected in the circulation pipeline (2). The mortar pump (3) is driven by the electric motor (4) and can pump the liquid mortar from the mortar box (1) into the circulation pipeline (2) and form a circulating erosion liquid flow outside the mortar box (1). The circulation pipeline (2) is a variable-diameter pipeline, and the pipeline diameter decreases step by step from the drainage end to the erosion end, so that the liquid mortar pumped into the circulation pipeline (2) can increase the flow rate as the aperture of the flowing area decreases.

2. The simulation test bench for erosion resistance performance of a reduced-diameter and speed-increasing drill check valve as described in claim 1, wherein: The pipe body of the circulation pipeline (2) is composed of three sections connected, namely a large-aperture section A, a medium-aperture section B and a small-aperture section C. The large-aperture section A, the medium-aperture section B and the small-aperture section C are arranged in sequence from the drainage end to the erosion end, and the pipe diameters of each aperture section decrease step by step in sequence.

3. The simulation test bench for erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve as described in claim 1, wherein, Also including: Check valve loading vehicle (10), guide rail (8) and limit post (9) provided on the detection work platform; the check valve loading vehicle (10) specifically includes: vehicle body (11), wheels (12), bearing seat (13), lead screw (14), lead nut sleeve (15) and thrust bearing (16). The wheels (12) are connected and installed on the vehicle body (11). The bearing seat (13) and the lead nut sleeve (15) are annular sleeves with corresponding structures. An internal thread is provided on the inner ring surface of the lead nut sleeve (15). The bearing seat (13) is fixedly installed on the vehicle body (11). The lead nut sleeve (15) is coaxially stacked on the bearing seat (13) supported by the thrust bearing (16), so that the lead nut sleeve (15) can rotate axially relative to the bearing seat (13). The lead screw (14) is inserted and fitted in the central axis holes of the lead nut sleeve (15) and the bearing seat (13). An external thread is provided on the outer circumference, and the external thread corresponds to and is connected in cooperation with the internal thread provided on the lead nut sleeve (15). The lower end is circumferentially limited by the bearing seat (13) to restrict the rotation of the lead screw (14) relative to the bearing seat (13). A supporting mechanism is provided on the upper end of the lead screw (14), and the supporting mechanism corresponds to and cooperates with the structure at the lower end of the check valve to be detected (20), so that the lead screw (14) can stably and reliably vertically support the check valve to be detected (20). The guide rail (8) is a limit rail corresponding to the structure of the vehicle body (11), which defines the movement track of the check valve loading vehicle (10) moving from the loading station of the check valve to be detected (20) to the detection station. The limit post (9) is correspondingly arranged with the guide rail (8), and can position the valve loading vehicle (10) moved to the detection station at the detection station. At the detection station, the lead screw (14) and the threaded joint (7) installed on the erosion end of the circulation pipeline (2) are kept vertically coaxial.

4. The simulation detection test bench for erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve as described in claim 3, characterized in that: A supporting ring (17) is detachably sleeved on the upper end of the lead screw (14). The outer circumference of the supporting ring (17) forms an insertion fit with the central axis hole at the lower end of the check valve to be detected (20). The lead screw (14) and the supporting ring (17) are combined to form a supporting mechanism for the check valve to be detected (20).

5. The erosion-resistant performance simulation detection test bench for a reduced-diameter and speed-increasing type drill check valve according to any one of claims 1 to 4, characterized in that: A filter screen box (21) is installed in the mortar box (1). The filter screen box (21) entirely encloses the diversion hole communicating with the circulation pipeline (2) to filter the liquid mortar pumped into the circulation pipeline (2).

6. The simulation test bench for erosion resistance performance of a reduced-diameter and speed-increasing drill string check valve according to claim 5, characterized in that: An image monitoring head (22) is installed in the check valve to be detected (20). The image monitoring head (22) is arranged above the valve core (28) installed in the inner cavity of the check valve to be detected (20).

7. The simulation test bench for erosion resistance performance of a reduced-diameter and speed-increasing type drill string check valve according to claim 6, characterized in that: A flow velocity sensor (23) is installed in the circulation pipeline (2). The flow velocity sensor (23) is arranged in the port area of the erosion end of the circulation pipeline (2).

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