A cutterhead scouring test device capable of adjusting the position of the mud cake

Abstract

The utility model belongs to the technical field of shield cutter test equipment, disclose a kind of cutter wash test device of adjustable mud cake position, including the front opening, the back closed cylinder shell, install cutter model in cylinder shell;Motor rotating shaft is rotatably connected with the back side plate center of cylinder shell, and then fixed with the back center of cutter model;The diameter of cutter model is less than the inner wall diameter of cylinder shell;The front of cylinder shell is detachably connected transparent glass plate, cutter model and transparent glass plate reserved set distance gap, for installing mud cake sample;Cutter model front evenly set up several slide rails, and one end of slide rail penetrates the outer peripheral portion of cutter model, and the other end is installed washout between the center of cutter model, and washout is towards slide rail;Sample sliding block is slidably connected in slide rail, and mud cake sample is installed on sample sliding block. The distance of mud cake sample distance washout or the component of mud cake sample can be adjusted, and the influence of different wash distance or viscosity on wash effect is observed.

Description

Technical Field

[0001] This utility model belongs to the technical field of shield tunnel cutterhead testing equipment, specifically relating to a cutterhead erosion testing device with adjustable mud cake position. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Slurry balance shield tunneling is a widely used method in underground tunnel engineering. When tunneling through highly viscous strata, slurry cake easily adheres to the surface of the cutterhead. This slurry cake not only reduces the cutterhead opening ratio, significantly decreasing tunneling efficiency, but also easily leads to problems such as cutter jamming, abnormal cutterhead wear, and seal failure, affecting the tunneling efficiency of the shield machine. In actual shield construction, to remove the slurry cake from the cutterhead, a flushing system is often installed to spray high-pressure fluid to peel off the adhered slurry cake, achieving timely cleaning of the cutterhead during tunneling.

[0004] Once the layout of the flushing system on the cutterhead is finalized, it cannot be modified during construction. Therefore, simulation devices are typically used to model potential scenarios encountered by the tunnel boring machine (TBM) to guide the flushing system layout. Existing technology discloses a slurry TBM flushing experimental system and its application simulation device, including a water tank, a first inlet pipe and a second inlet pipe connected to the water tank via a water pump, and the first inlet pipe connected to a pressure tank. The second inlet pipe is connected to a flow distributor, which is connected to several nozzles arranged inside the pressure tank via several branch pipes. The jet flow field of the nozzles in the cutterhead panel area is obtained through an observation surface and a particle image velocimeter.

[0005] The above scheme simulates the scouring performance of the nozzle flushing system in the cutter head area by changing the number and flow rate of the nozzles, but it has the following drawbacks: The above scheme simulates the pressure environment of the cutterhead by using a pressure chamber and obtains the jet flow field of the nozzle in the cutterhead panel area by using an observation surface and a particle image velocimeter. However, it does not conduct simulated scouring tests on actual mud cakes, so it cannot obtain the scouring effect of the jet flow field on mud cakes of different viscosity, nor can it obtain the scouring effect of mud cakes adhering to different positions on the cutterhead. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a cutterhead scouring test device with adjustable mud cake position, which can solve the technical problem in the prior art that there is no simulated scouring test for actual mud cake, and the scouring effect of the jet flow field on mud cakes of different viscosity and at different positions of the cutterhead cannot be obtained.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A cutterhead scouring test device with adjustable mud cake position is provided, including a cylindrical shell with an open front and a closed back, and a cutterhead model is installed inside the cylindrical shell; the motor shaft of the motor is rotatably connected to the center of the back side plate of the cylindrical shell and then fixedly connected to the center of the back of the cutterhead model. The diameter of the cutter head model is smaller than the inner diameter of the cylindrical shell; A transparent glass plate is detachably connected to the front of the cylindrical shell. A predetermined gap is reserved between the cutter head model and the transparent glass plate for mounting mud cake samples. Several slide rails are evenly opened on the front of the cutter head model. One end of the slide rail passes through the outer periphery of the cutter head model, and the other end is equipped with a flushing port between it and the center of the cutter head model, with the flushing port facing the slide rail. The sample slider is slidably connected to the slide rail, and the mud cake sample is mounted on the sample slider.

[0008] Preferably, a bearing is installed in the center of the back side plate, the outer ring of the bearing is connected to the opening of the back side plate, the motor shaft is fixedly connected to the inner ring of the bearing, a sealant layer is applied to the outside of the connection between the outer ring of the bearing and the opening, and small holes are drilled on the inner ring of the bearing along the axial direction.

[0009] Preferably, the flushing port is connected to the flow channel inside the cutter head model, the flow channel inside the cutter head model is connected to a flexible hose, and the flexible hose passes through the small hole in the inner ring of the bearing and is connected to an external pressure pump.

[0010] Preferably, a mud inlet pipe and a mud outlet pipe are installed on a transparent glass plate. The mud inlet pipe is connected to a mud pump, and the mud outlet pipe is connected to a mud tank. The diameter of the mud inlet pipe is smaller than the diameter of the mud outlet pipe.

[0011] Preferably, the cutter head model is made according to a scaled-down version of the spoke-type cutter head, and the slide rails are opened on the spokes of the cutter head model. Multiple slide rails are arranged in a circular array with the center of the cutter head model as the center. The bottom of the slide rails is fixed with a limiting groove plate, and the bottom of the sample slider is opened with a limiting groove that is consistent with the shape and size of the limiting groove plate.

[0012] Preferably, a slider buckle is hinged to one side of the top surface of the sample slider, and several slider slots are evenly opened on the top surface of one side wall of the slide rail along the length of the slide rail; the side of the sample slider with the slider buckle is installed facing the side of the slide rail with the slider slot; along the width of the slide rail, the size of the slider slot is larger than the size of the slider buckle.

[0013] Preferably, a cylindrical groove is drilled in the center of the sample slider, and a sample fixing plate is fixed inside the cylindrical groove; the mud cake sample is a cylinder, the diameter of the mud cake sample is equal to the diameter of the cylindrical groove, and the height of the mud cake sample is greater than the depth of the cylindrical groove.

[0014] Preferably, a retaining ring is also fitted around the outer periphery of the cutter head model.

[0015] Preferably, a first ring plate is fixed to the inner wall of the cylindrical shell, and the distance from the first ring plate to the front of the cylindrical shell is equal to the thickness of the transparent glass plate; after the transparent glass plate is installed inside the cylindrical shell, a second ring plate is fitted on the front of the cylindrical shell, and the cross section of the second ring plate is L-shaped.

[0016] Preferably, it also includes a camera, which is connected to a computer and is positioned to film the transparent glass plate.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are: This invention features a cutterhead model with a slide rail, in which a sample slider is slidably connected. Different mud cake samples are mounted on the sample slider, allowing adjustment of the distance between the mud cake sample and the scouring port. Through multiple experiments, the scouring effect of mud cakes at different distances from the scouring port can be observed. Furthermore, the composition and viscosity of the mud cake sample can be adjusted according to the geological characteristics in actual engineering projects, allowing observation of the influence of geological composition on the scouring effect of the mud cake sample at the same scouring distance. Based on the experimental results, guidance can be provided for scouring schemes in actual engineering projects. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is a layout diagram of a cutterhead scouring test device with adjustable mud cake position according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the cylindrical shell according to an embodiment of the present utility model; Figure 3 This is a front view of the cutter head model according to an embodiment of the present utility model; Figure 4 This is an enlarged view of the slide rail according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the connection between the sample slider and the slider buckle in an embodiment of this utility model; In the picture: 1. Cylindrical shell; 2. Transparent glass plate; 3. Motor; 4. Hoses; 5. Pressure pump; 6. Mud inlet pipe; 7. Mud outlet pipe; 8. Camera; 9. Computer; 10. Cutter head model; 11. Retaining ring; 12. Slide rail; 13. Flushing port; 14. Bearing; 15. Motor shaft; 16. Sealing layer; 17. Limiting groove plate; 18. Sample slider; 19. Slider buckle; 20. Slider groove; 21. Sample fixing plate; 22. First ring plate; 23. Second ring plate. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a cutterhead erosion test device with adjustable mud cake position, such as... Figure 1 , Figure 2 As shown, the device includes a cylindrical shell 1, inside which a cutter head model 10 is installed. The center of the back side of the cutter head model 10 is connected to the motor shaft 15 of the motor 3 (both the cutter head model and the motor shaft are made of steel and can be connected by welding). The cylindrical shell 1 is a hollow shell with an open front and a closed back. The motor shaft 15 of the motor 3 is rotatably connected to the center of the back side plate of the cylindrical shell 1 and then fixedly connected to the center of the back side of the cutter head model 10.

[0022] It should be noted that the diameter of the cutterhead model 10 is smaller than the inner wall diameter of the cylindrical shell 1, so that when the motor 3 rotates, the cutterhead model 10 can rotate relative to the cylindrical shell 1 under the drive of the motor shaft 15, which is used to simulate the rotation scenario of the cutterhead in actual tunnel shield construction.

[0023] In this embodiment, as Figure 1 As shown, a transparent glass plate 2 is detachably connected to the front of the cylindrical shell 1, as... Figure 2 As shown, a predetermined gap is reserved between the cutter head model 10 and the transparent glass plate 2 for installing the mud cake sample; specifically, the mud cake sample is installed on the front of the cutter head model 10, and then the transparent glass plate 2 is installed. The process of the mud cake sample being washed can be observed through the transparent glass plate 2.

[0024] In this embodiment, as Figure 3 As shown, several slide rails 12 are evenly distributed on the front of the cutter head model 10. One end of each slide rail 12 passes through the outer periphery of the cutter head model 10, and a flushing port 13 is installed between the other end and the center of the cutter head model 10. Figure 2 As shown, the flushing port 13 faces the slide rail 12.

[0025] In this embodiment, as Figure 4 As shown, a sample slider 18 is slidably connected in the slide rail 12, and a mud cake sample is mounted on the sample slider 18. It can be understood that the transparent glass plate 2 can be opened to mount mud cakes of different viscosities on the sample slider 18 for simulated scouring tests. The position of the sample slider 18 relative to the slide rail 12 can be moved to change the position of the mud cake sample on the cutter head model 10, allowing for simulated scouring tests on mud cakes adhered to different positions on the cutter head.

[0026] It is understood that the device in this embodiment can adjust the distance between the mud cake sample and the flushing port, and observe the flushing effect of mud cakes at different distances from the flushing port through multiple tests. This embodiment can also adjust the composition of the mud cake sample and adjust its viscosity according to the geological characteristics in actual engineering, and observe the influence of geological composition on the flushing effect of mud cake sample at the same flushing distance. Based on the test results, it can provide guidance for the flushing scheme of actual engineering.

[0027] In this embodiment, as Figure 3 As shown, a hole is made in the center of the back plate of the cylindrical shell 1, and a bearing 14 is fixedly installed in the hole, so that the outer ring of the bearing 14 is connected to the hole of the back plate of the cylindrical shell 1 (interference fit connection), and the motor shaft 15 is fixedly connected to the inner ring of the bearing 14, allowing the motor shaft 15 to rotate relative to the back plate of the cylindrical shell 1. In this embodiment, the bearing 14 is a sealed deep groove ball bearing, and a sealant layer 16 is applied to the outer side of the connection between the outer ring of the bearing 14 and the hole of the back plate of the cylindrical shell 1 to prevent mud from flowing out of the bearing 14 during the simulated scouring test. In this embodiment, a small hole is drilled axially on the inner ring of the bearing 14.

[0028] In this embodiment, as Figure 1 , Figure 3 As shown, the flushing port 13 is connected to the flow channel inside the cutter head model 10. The flow channel inside the cutter head model 10 is connected to the hose 4, through which flushing fluid is delivered into the flow channel. The flushing fluid flows through the flushing port 13 to flush the mud cake sample on the slide rail 12, simulating a flushing test. The hose 4 connecting to the flow channel inside the cutter head model 10 is connected to an external pressure pump 5 through a small hole. The pressure pump 5 pumps water from a water tank through the hose 4 to the flow channel inside the cutter head model 10, and the water flows out through the flushing port 13 to flush the mud cake sample installed on the slide rail 12.

[0029] It is understandable that adjusting the pressure of the pressure pump 5 can change the flow rate of the flushing fluid at the outlet of the flushing port 13; in this embodiment, through multiple experiments, the flushing effect of the mud cake at a fixed flushing distance under different flow rates can be observed.

[0030] It should be noted that when the motor shaft 15 drives the cutterhead model 10 to rotate, the hose 4 will rotate along with the inner ring of the bearing and will also wrap around the motor shaft 15. In this embodiment, to realistically simulate the scenario of mud cake adhering to the cutterhead, the motor 3 is a servo motor, and the rotation speed of the cutterhead model 10 is set to 0.9-1.2 r / min to simulate the speed of the actual shield machine cutterhead after mud cake adhering. At the same time, the flushing time is controlled to 3 minutes. Mud cake samples that have not been flushed after 3 minutes will be considered as mud cakes that cannot be flushed at the current position or with the current viscosity at the current flow rate. That is, the number of turns of the hose 4 around the motor shaft 15 is 0-3 turns. During the winding, due to the water pressure in the hose 4 and the pre-set gap between the outer shell of the motor 3 and the back plate of the cylindrical shell 1, the cross-section of the hose 4 will not deform when it is wrapped around the motor shaft 15.

[0031] It should also be noted that the servo motor 3 can rotate in both directions. When conducting multiple tests, the servo motor 3 first rotates in the forward direction to complete one test. After changing the mud cake sample, the servo motor 3 rotates in the reverse direction to complete one test. That is, the servo motor 3 rotates in both directions alternately to avoid the hose 4 being wound too many times on the motor shaft 15, which would affect the test process.

[0032] like Figure 1 , Figure 3 As shown, a mud inlet pipe 6 and a mud outlet pipe 7 are installed on the transparent glass plate 2. The mud inlet pipe 6 is connected to a mud pump (which is connected to a mud tank), which inputs mud into the space between the transparent glass plate 2 and the cylindrical shell 1 at a set pressure. The mud outlet pipe 7 is connected to the mud tank, allowing the mud to circulate between the transparent glass plate 2 and the cylindrical shell 1. The mud inlet pipe 6 and the mud outlet pipe 7 are used to simulate the mud environment of the tunnel boring machine cutterhead during construction.

[0033] It should be noted that after the mud cake sample is installed on the sample slider 18, the transparent glass plate 2 is installed on the cylindrical shell 1, and the mud is input between the transparent glass plate 2 and the cylindrical shell 1 at a set pressure. The mud outlet pipe 7 is connected to the mud tank, so that the mud circulates between the transparent glass plate 2 and the cylindrical shell 1. The motor 3 is started, and the motor 3 drives the cutter head model 10 to rotate at a set speed. The pressure pump 5 is turned on, and the flushing liquid then enters the flow channel of the cutter head model 10 from the hose 4 and flushes the mud cake sample from the flushing port 13.

[0034] In this embodiment, the diameter of the mud inlet pipe 6 is smaller than the diameter of the mud outlet pipe 7 to prevent the mud from failing to be discharged in time, which would cause excessive pressure inside the cylindrical shell 1 and affect the test process.

[0035] like Figure 2As shown, the cutter head model 10 is made according to a scaled-down version of the spoke-type cutter head in the prior art, wherein the slide rails 12 are formed on the spokes of the cutter head model 10. Specifically, in this embodiment, six slide rails 12 are provided and arranged in a circular array with the center of the cutter head model 10 as the center. Correspondingly, six flushing ports 13 are symmetrically arranged at the center of the cutter head model 10, and the flushing ports 13 face the slide rails 12.

[0036] like Figure 3 , Figure 4 As shown, with the transparent glass plate 2 as the top surface of the slide rail 12, the bottom of the slide rail 12 is fixedly connected (integratedly connected) to an inverted trapezoidal limiting groove plate 17. The bottom of the sample slider 18 has a limiting groove with the same shape and size as the limiting groove plate 17. When the sample slider 18 is installed on the slide rail 12, the top surface of the sample slider 18 is flush with the top surface of the slide rail 12, and the width of the sample slider 18 is equal to the width of the slide rail 12. The purpose of this design is to restrict the sample slider 18 from moving axially relative to the slide rail 12 along the cutter head model 10 when it is slidably connected to the slide rail 12.

[0037] like Figure 4 , Figure 5 As shown, a slider buckle 19 is hinged to one side of the top surface of the sample slider 18, and the slider buckle 19 rotates relative to the sample slider 18. Along the length direction of the slide rail 12, several slider slots 20 are evenly opened on the top surface of one side wall of the slide rail 12. The side of the sample slider 18 with the slider buckle 19 is installed facing the side of the slide rail 12 with the slider slot 20. After adjusting the position of the sample slider 18 relative to the slide rail 12, the slider buckle 19 is inserted into the slider slot 20, which can restrict the movement of the sample slider 18 relative to the length direction of the slide rail 12.

[0038] It should be noted that, along the length of the slide rail 12, the size of the slider slot 20 is equal to the size of the slider buckle 19, and the depth of the slider slot 20 is equal to the thickness of the slider buckle 19; along the width of the slide rail 12, the size of the slider slot 20 is greater than the size of the slider buckle 19, which facilitates the removal of the slider buckle 19 from the slider slot 20.

[0039] like Figure 4 As shown, a cylindrical groove is drilled in the center of the sample slider 18, and a sample fixing plate 21 is fixedly connected (integratedly connected) inside the cylindrical groove. In this embodiment, the mud cake sample is a cylinder, the diameter of the mud cake sample is equal to the diameter of the cylindrical groove, and the height of the mud cake sample is greater than the depth of the cylindrical groove. The height of the mud cake sample is adjusted to adjust the height of the mud cake sample exposed in the cylindrical groove (i.e., simulate the thickness of the mud cake). The mud cake sample is inserted into the cylindrical groove of the sample slider 18, and the sample fixing plate 21 is combined with the mud cake sample to enhance the fixing effect of the mud cake sample.

[0040] In this embodiment, the soil sample for the mud cake test is the original soil sample from the construction area, or the soil sample is prepared based on the actual stratum composition in the project. After the soil sample is completely dried, distilled water is added to the soil sample according to the moisture content of the engineering stratum. After mixing evenly, the cylindrical sample is pressed in layers using a mold and stored in a sealed box away from light for 24 hours.

[0041] In this embodiment, a retaining ring 11 is also fitted around the outer periphery of the cutter head model 10. The retaining ring 11 is magnetically attracted to the cutter head model 10 to prevent the slider buckle 19 from not engaging with the slider slot 20, or from being damaged due to a malfunction. In this case, the water pressure at the flushing port 13 is too high, which would cause the sample slider 18 with the mud cake sample to be ejected from the cutter head model 10 and stuck between the cutter head model 10 and the cylindrical shell 1, thus hindering the rotation of the cutter head model 10 and preventing damage to the cylindrical shell 1.

[0042] During installation, first install the mud cake sample on the sample slider 18, then remove the retaining ring 11, push the sample slider 18 into the slide rail 12, and push the sample slider 18 to the position designed for the test. Then, pull down the slider buckle 19 to make it firmly embedded in the slider slot 20, and put the retaining ring 11 back in.

[0043] like Figure 3 As shown, a first ring plate 22 is fixedly connected (welded) to the inner wall of the cylindrical shell 1. The distance from the first ring plate 22 to the front of the cylindrical shell 1 is equal to the thickness of the transparent glass plate 2. After the transparent glass plate 2 is installed inside the cylindrical shell 1, a second ring plate 23 is fitted on the front of the cylindrical shell 1. The first ring plate 22 and the second ring plate 23 are used to limit the displacement of the transparent glass plate 2.

[0044] like Figure 3 As shown, the second ring plate 23 has an L-shaped cross-section, which is used to restrict the forward movement of the transparent glass plate 2 towards the cylindrical shell 1; the first ring plate 22 is used to restrict the movement of the transparent glass plate 2 towards the cutter head model 10. At the same time, this spaced arrangement of the first ring plate 22, the second ring plate 23, and the transparent glass plate 2 also serves as a sealing function.

[0045] like Figure 1 As shown, a cutterhead erosion test device with adjustable mud cake position also includes a camera 8. The camera 8 is connected to a computer 9 via a data cable. The camera 8 is mounted facing the transparent glass plate 2 and records the process of the mud cake sample being eroded during the test. The camera 8 transmits the recorded data to the computer 9 for storage, facilitating the analysis of test results after multiple sets of tests. The device analyzes the erosion effect of mud cake samples with different viscosities at different flow rates or positions, and simulates cutterhead erosion tests under different variables.

[0046] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A cutterhead erosion test device with adjustable mud cake position, characterized in that, The device includes a cylindrical shell with an open front and a closed back, and a cutter head model is installed inside the cylindrical shell; the motor shaft of the motor is rotatably connected to the center of the back side plate of the cylindrical shell and then fixedly connected to the center of the back of the cutter head model. The diameter of the cutter head model is smaller than the inner wall diameter of the cylindrical shell; A transparent glass plate is detachably connected to the front of the cylindrical shell. A predetermined gap is reserved between the cutter head model and the transparent glass plate for mounting mud cake samples. Several slide rails are evenly opened on the front of the cutter head model. One end of the slide rail passes through the outer periphery of the cutter head model, and a flushing port is installed between the other end and the center of the cutter head model. The flushing port faces the slide rail. The sample slider is slidably connected to the slide rail, and the mud cake sample is mounted on the sample slider.

2. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, The center hole of the back side plate is used to install the bearing. The outer ring of the bearing is connected to the hole of the back side plate. The motor shaft is fixedly connected to the inner ring of the bearing. A sealant layer is applied to the outside of the connection between the outer ring of the bearing and the hole. Small holes are drilled on the inner ring of the bearing along the axial direction.

3. The cutterhead erosion test device with adjustable mud cake position as described in claim 2, characterized in that, The flushing port is connected to the flow channel inside the cutter head model, and the flow channel inside the cutter head model is connected to a flexible hose. The flexible hose passes through the small hole in the inner ring of the bearing and is connected to an external pressure pump.

4. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, A mud inlet pipe and a mud outlet pipe are installed on the transparent glass plate. The mud inlet pipe is connected to a mud pump, and the mud outlet pipe is connected to a mud tank. The diameter of the mud inlet pipe is smaller than the diameter of the mud outlet pipe.

5. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, The cutter head model is made according to a scaled-down version of the spoke-type cutter head. The slide rails are opened on the spokes of the cutter head model, and multiple slide rails are arranged in a circular array with the center of the cutter head model as the center. The bottom of the slide rails is fixed with a limiting groove plate, and the bottom of the sample slider is opened with a limiting groove that is the same shape and size as the limiting groove plate.

6. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, The top surface of the sample slider is hinged with a slider buckle on one side. Along the length of the slide rail, several slider slots are evenly opened on the top surface of one side wall of the slide rail. The sample slider with the slider buckle is installed facing the side of the slide rail with the slider slot. Along the width of the slide rail, the size of the slider slot is larger than the size of the slider buckle.

7. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, A cylindrical groove is drilled in the center of the sample slider, and a sample fixing plate is fixed in the cylindrical groove; the mud cake sample is a cylinder, the diameter of the mud cake sample is equal to the diameter of the cylindrical groove, and the height of the mud cake sample is greater than the depth of the cylindrical groove.

8. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, The outer periphery of the cutter head model is also fitted with a retaining ring.

9. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, The inner wall of the cylindrical shell is fixed with a first ring plate. The distance from the first ring plate to the front of the cylindrical shell is equal to the thickness of the transparent glass plate. After the transparent glass plate is installed inside the cylindrical shell, a second ring plate is fitted on the front of the cylindrical shell. The cross-section of the second ring plate is L-shaped.

10. The cutterhead erosion test device with adjustable mud cake position as described in claim 1, characterized in that, It also includes a camera, which is connected to a computer and is pointing directly at the transparent glass panel to take pictures.

Images