Water jet rock free surface cutting test device in submerged jet environment

Abstract

The invention discloses a water jet rock free surface cutting test device under a submerged jet environment, and relates to the field of geotechnical engineering detection.The water jet rock free surface cutting test device comprises a closed experiment bin, a high-pressure water jet system, a pressure servo system and a water pressure sensing device; liquid pressure around a to-be-tested rock block in the closed experiment bin is adjusted through the pressure servo system so as to simulate a submerged jet environment in the actual rock breaking process, the high-pressure water jet system can generate a high-pressure water jet cutter to cut the to-be-tested rock block, and in the process of a water jet rock free surface cutting test in the submerged jet environment, the rock free surface is cut by the high-pressure water jet cutter. By adjusting the moving speed of the water jet nozzle in the high-pressure water jet system, the nozzle moving speed matched with the required grooving depth is obtained, and therefore the problem that the rock breaking and well drilling efficiency is low is solved.

Description

Technical Field

[0001] The invention relates to the field of geotechnical engineering detection, and in particular to a water jet rock free surface cutting test device in a submerged jet environment. Background Art

[0002] In the process of shaft excavation, when drilling large-diameter shafts in some hard rock areas, the drilling speed is prone to slow due to the high rock strength, which prolongs the construction progress and causes unnecessary loss of time and energy. Therefore, improving drilling efficiency is the key to improving the quality of shaft construction in hard rock areas and reducing the construction period. At present, in order to improve the construction quality and shorten the construction period, hydraulic combined rock breaking is usually used for drilling construction. First, the hard rock layer is pre-cut and destroyed by a high-pressure water jet to reduce the strength of the rock layer, and then a mechanical rock breaking method is used to protect the tool, increase the excavation speed, and achieve the purpose of saving costs and shortening the construction period.

[0003] In recent years, rock drilling technologies including composite high-efficiency rock breaking processes with hydraulic combined rock breaking have developed rapidly and have been successfully applied in tunnel construction, mining, and oil and gas drilling. The first domestic high-pressure hydraulic combined rock breaking TBM "Longyan" was put into engineering application in the TBM tunnel of the Wan'anxi Water Diversion Project in Longyan, Fujian in 2020, and the rock breaking drilling efficiency was increased by 60%. Although the "Longyan" has verified the feasibility of hydraulic combined rock breaking, the efficiency of rock breaking drilling still needs to be further improved.

[0004] Based on past experience, the drill bit in large-diameter vertical shaft drilling projects is often in a liquid environment such as mud and groundwater. Water jet rock breaking in this liquid environment is called a submerged jet environment. In a submerged jet environment, a key point of high-pressure water jet cutting is that before actual operation, it is necessary to clarify the attenuation law of the water flow in the submerged jet environment after it is ejected from the nozzle and the turbulence characteristics caused to the surrounding flow field. Therefore, the influence of the submerged jet environment on the ability of water jets to cut rock can be simulated through indoor experiments to obtain the nozzle movement speed that matches the required cutting depth, further improving the rock breaking efficiency. Summary of the invention

[0005] The present application provides a water jet rock free surface cutting test device in a submerged jet environment, which can solve the technical problem of low rock breaking and drilling efficiency existing in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a water jet rock free surface cutting test device in a submerged jet environment, comprising: Closed experimental chamber; and, a clamping assembly, a high-pressure water jet system, a pressure servo system, and a water pressure sensing device; The clamping assembly is arranged inside the closed experimental chamber and is used to clamp the rock block to be tested; The high-pressure water jet system comprises a supply water tank, a high-pressure water pump and a water jet nozzle, the high-pressure water pump is connected to the supply water tank, the water jet nozzle is connected to the high-pressure water pump through a connecting water pipe, the spray end of the water jet nozzle extends into the closed experimental chamber and faces the clamping position of the clamping assembly, and the water jet nozzle is slidably arranged in the closed experimental chamber; The pressure servo system comprises a pressure water supply tank, a pressure water supply pump, a pressure water supply pipe and a return water pipe, wherein the pressure water supply pump is connected to the pressure water supply tank; the two ends of the pressure water supply pipe are respectively connected to the pressure water supply pump and the closed experimental chamber, and a pressure supply control member is provided on the pressure water supply pipe; the two ends of the return water pipe are respectively connected to the pressure water supply tank and the closed experimental chamber, and a return flow control member is provided on the return water pipe; The water pressure sensing device is arranged in the closed experimental chamber and is used to monitor the pressure in the closed experimental chamber.

[0007] By adopting the above technical scheme, during the water jet rock free surface cutting test in a submerged jet environment, the rock block to be tested is placed in a closed test chamber, the rock block to be tested is fixed on the clamping station using a clamping assembly, the pressure water pump is turned on, so that the water in the pressure water tank is filled into the closed test chamber through the pressure water pipe, and the water in the closed test chamber then enters the pressure water tank through the return water pipe, thereby forming a liquid passage in the closed test chamber, so that the liquid pressure in the closed test chamber is observed through the water pressure sensing device in the closed test chamber, and then the pressure supply control component and the return flow control component are fine-tuned to control the liquid pressure in the closed test chamber within the required test pressure, and then the high-pressure water pump is turned on, so that the water in the supply water tank is sprayed out through the connecting water pipe through the water jet nozzle, and the water jet nozzle can spray a high-pressure water jet to cut the rock block to be tested below, and by adjusting the moving speed of the water jet nozzle in the high-pressure water jet system, the nozzle moving speed matching the required cutting depth is obtained, thereby solving the problem of low rock breaking drilling efficiency.

[0008] In one embodiment, the pressure servo system further includes an overflow valve, and the overflow valve is arranged between the pressure water supply pipe and the return water pipe.

[0009] By adopting the above technical solution, during the test, the test operator can directly adjust the liquid pressure in the closed test chamber through the overflow valve in conjunction with the water pressure sensing device, which further facilitates the test operator to adjust the liquid pressure in the closed test chamber.

[0010] In one embodiment, a sliding guide rail is arranged at the top of the closed experimental chamber, a movable slider is arranged on the sliding guide rail along the length direction of the sliding guide rail, and the water jet nozzle is arranged on the movable slider.

[0011] By adopting the above technical solution, the water jet nozzle can move and cut the rock block to be tested below along the length direction of the closed test chamber by moving the slider on the sliding guide rail. By adjusting the moving speed of the moving slider, the optimal nozzle moving speed for the required cutting depth of the rock to be tested in the submerged jet environment can be tested, thereby improving the rock breaking efficiency.

[0012] In one embodiment, the clamping assembly includes a plurality of hydraulic struts and a plurality of mold clamps, one end of the hydraulic strut is connected to the side wall of the closed experimental chamber, and the other end is connected to a single mold clamp.

[0013] By adopting the above technical solution, the mold clamp can move toward the direction of the rock block to be tested under the push of the hydraulic support, and the cooperation of multiple mold clamps can clamp the rock block to be tested on the clamping station to reduce the possibility of subsequent slippage of the rock block to be tested under the impact of the high-pressure water jet, thereby reducing the test error of the water jet rock free surface cutting test device in a submerged jet environment.

[0014] In one embodiment, a side of the mold clamping block facing the clamping station is provided with an anti-slip member.

[0015] By adopting the above technical solution, the anti-slip part can increase the friction between the mold clamp and the rock block to be tested, so that the mold clamp can clamp the rock block to be tested more tightly, further reducing the possibility of slipping of the rock block to be tested under the impact of high-pressure water jet.

[0016] In one embodiment, a test support platform is further connected below the closed test chamber, the bottom plate of the closed test chamber is configured as a hollow grid, and the interior of the test support platform is hollow.

[0017] By adopting the above technical solution, when conducting a water jet rock free surface cutting test in a submerged jet environment, the liquid in the closed test chamber can enter the hollow cavity of the test support platform through the hollow grid mesh, further increasing the test volume, thereby better simulating the submerged jet environment in actual rock breaking engineering.

[0018] In one embodiment, the closed experimental chamber is made of tempered glass.

[0019] By adopting the above technical solution, since tempered glass has good rigidity and strength, using tempered glass to make a closed experimental chamber can make the closed experimental chamber stronger, thereby enabling the closed experimental chamber to support different internal liquid environments and improving the service life of the closed experimental chamber.

[0020] In one embodiment, the closed experimental chamber outer shell is provided with a dustproof box body, and the dustproof box body is provided with a switch sliding door.

[0021] By adopting the above technical solution, when the water jet rock free surface cutting test is not carried out in a submerged jet environment, the dustproof box can protect the closed experimental chamber to reduce the impact of external dust falling on the closed experimental chamber on the experimental environment. The switch sliding door on the dustproof box can facilitate the test operator to place the rock block to be tested into the closed experimental chamber, and at the same time facilitate the subsequent cleaning of the inside of the dustproof box.

[0022] In one embodiment, the pressure supply control component is configured as a pressure supply water valve.

[0023] By adopting the above technical solution, the structure is simple and the operation is convenient, which makes it easy for test personnel to adjust the opening and closing of the water flow in the pressure water supply pipe.

[0024] In one embodiment, the backflow control component is configured as a backflow water valve.

[0025] By adopting the above technical solution, the structure is simple and the operation is convenient, which makes it easy for test personnel to adjust the opening and closing of the water flow in the return water pipe.

[0026] The beneficial effects brought by the technical solution provided in the embodiments of the present application include: Water is injected into the closed experimental chamber through the pressure servo system to make the rock block to be tested in a liquid environment in the closed experimental chamber. The water pressure sensing device can monitor the liquid pressure in the closed experimental chamber, and the pressure in the closed experimental chamber is changed by adjusting the pressure supply control component and the reflux control component to simulate the submerged jet environment in which the rock block to be tested is located; the rock block to be tested is fixed by a clamping assembly, and finally a high-pressure water jet system is used to generate a high-pressure water jet to cut the rock block to be tested. The influence of the submerged jet environment on the water jet cutting ability of the rock mass is simulated through indoor experiments, so as to obtain the nozzle movement speed that matches the required cutting depth, improve the rock breaking efficiency, and solve the problem of low rock breaking drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a cross-sectional view of the overall structure of the water jet rock free surface cutting test device in the submerged jet environment in this application; Figure 2 This is a schematic diagram of the structure of the closed experimental chamber connected to the test support platform and the dustproof box in this application; In the figure: 1. Test support table; 2. Closed experimental chamber; 21. Hollow grid; 22. Hydraulic support; 23. Mold clamp; 24. Sliding guide; 25. Water pressure sensing device; 3. Supply water tank; 31. High-pressure water pump; 32. Water jet nozzle; 33. Connecting water pipe; 4. Pressure water tank; 41. Pressure water pump; 42. Pressure water pipe; 421. Pressure water valve; 43. Return water pipe; 431. Return water valve; 44. Overflow valve; 5. Dustproof box; 51. Switch sliding door; 6. Rock block to be tested. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The embodiment of the present application provides a water jet rock free surface cutting test device in a submerged jet environment, which can solve the problem of low rock breaking drilling efficiency.

[0031] Reference Figure 1 The overall structural cross-sectional view of a water jet rock free surface cutting test device under a submerged jet environment. The present application discloses a water jet rock free surface cutting test device under a submerged jet environment, comprising a closed test chamber 2, a high-pressure water jet system, a pressure servo system and a water pressure sensing device 25. A clamping assembly for clamping rock blocks to be tested is arranged in the closed test chamber 2. The liquid pressure around the rock blocks to be tested in the closed test chamber 2 is adjusted by the pressure servo system to simulate the submerged jet environment in the actual rock breaking process. The high-pressure water jet system can generate a high-pressure water knife to cut the rock blocks to be tested. During the water jet rock free surface cutting test under the submerged jet environment, the moving speed of the water jet nozzle 32 in the high-pressure water jet system is adjusted to obtain the nozzle moving speed matching the required cutting depth, thereby solving the problem of low rock breaking drilling efficiency.

[0032] Reference Figure 2Schematic diagram of the structure of the closed experimental chamber connected to the test support platform and the dustproof box, the outer cover of the closed experimental chamber 2 is provided with a dustproof box 5, and the dustproof box 5 is provided with a switch sliding door 51, so as to facilitate the closed experimental chamber 2 to be placed in the dustproof box 5, and also facilitate the test operator to place the rock block 6 to be tested in the closed experimental chamber 2, and the dustproof box 5 can provide dust-proof protection for the closed experimental chamber 2, which is convenient for subsequent cleaning; a test support platform 1 is added below the closed experimental chamber 2, the test support platform 1 is hollow, and the area of ​​the upper and lower bottom surfaces of the test support platform 1 is larger than the area of ​​the upper and lower bottom surfaces of the closed experimental chamber 2, the closed experimental chamber 2 is fixedly welded on the test support platform 1, and the bottom surface of the closed experimental chamber 2 is provided with a hollow grid mesh 21, so that when the water jet rock free surface cutting test is carried out in the submerged jet environment, the liquid in the closed experimental chamber 2 can pass through the hollow grid mesh 21 into the hollow cavity of the test support platform 1, further increasing the test volume, thereby better simulating the submerged jet environment in the actual rock breaking project.

[0033] In this embodiment, the dustproof box 5 is adapted to the upper and lower bottom areas of the test support platform 1, and the test support platform 1 is provided with an installation groove for the dustproof box 5 to be inserted into, so that the overall installation of the dustproof box 5, the closed experimental chamber 2 and the test support platform 1 is more convenient. In other embodiments, it can also be freely assembled according to the environment of the laboratory and the specific needs of the experimenters. The closed experimental chamber 2 is made of tempered glass to improve the structural strength of the closed experimental chamber 2, so that the closed experimental chamber 2 can support different liquid environments inside and improve the service life of the closed experimental chamber 2; a cover is provided on the top of the closed experimental chamber 2. Before conducting a water jet rock free surface cutting test in a submerged jet environment, the cover of the closed experimental chamber 2 is opened to facilitate the placement of the rock block 6 to be tested into the closed experimental chamber 2. The cover of the closed experimental chamber 2 can be tightly fastened with the chamber body of the closed experimental chamber 2 so that the test environment can always be in a closed environment. In other embodiments, the cover of the closed experimental chamber 2 can also be set at the end of the closed experimental chamber 2 facing the dustproof box 5 where a switch sliding door 51 is provided, so as to further facilitate the placement of the rock block 6 to be tested. The specific installation structure of the closed experimental chamber 2 is variable, as long as it can facilitate the convenience of placing the rock block 6 to be tested and the sealing of the closed experimental chamber 2.

[0034] The clamping assembly includes a plurality of hydraulic props 22 and a plurality of mold clamps 23. In the present embodiment, two mold clamps 23 are specifically provided. The plurality of hydraulic props 22 are fixed at intervals on two opposite side walls of the closed experimental chamber 2 by bolts. The interval fixing makes it easier for the liquid in the closed experimental chamber 2 to pass through the hollow grid 21 at the bottom of the closed experimental chamber 2. The hydraulic props 22 on each side wall of the closed experimental chamber 2 are of the same length, and one mold clamp 23 is welded and fixed to each end of the hydraulic props 22 on the two opposite side walls of the closed experimental chamber 2. The length of the mold clamp 23 is adapted to the length of the side wall of the closed experimental chamber 2. The two mold clamps 23 can move toward the direction of the rock block to be tested under the push of the hydraulic props 22 on the two opposite side walls of the closed experimental chamber 2, so as to clamp the rock block to be tested on the clamping station.

[0035] Furthermore, since the rock block to be tested is always in a liquid environment in the closed experimental chamber 2, although the rock block to be tested has been pre-processed into a regular shape before the test, when the high-pressure water jet system subsequently performs water jet cutting on the rock block to be tested, in order to reduce the possibility of the rock block to be tested slipping on the hollow grid net due to the strong impact force, an anti-slip part is additionally provided on the opposite surface of the mold clamp 23. In this embodiment, the anti-slip part is specifically made of wear-resistant rubber to increase the friction between the mold clamp 23 and the rock block to be tested, so that the mold clamp 23 can clamp the rock block to be tested 6 more tightly.

[0036] In this embodiment, the hydraulic prop 22 is fixed to the inner wall of the closed test chamber 2 by bolts. The bolt fixing method is more convenient for the installation and removal of the hydraulic prop 22, and the subsequent regular maintenance of the hydraulic prop 22 is more convenient. In other embodiments, the hydraulic prop 22 can also be welded and fixed to the two opposite side walls of the closed test chamber 2 according to the needs of different tests, so that the hydraulic prop 22 is more stable in the liquid environment; similarly, the number of hydraulic props 22 can also be adjusted according to the requirements of the size of the inner cavity of the closed test chamber 2 in the actual test environment, and the mold clamp 23 can also be spliced ​​into a whole using multiple mold clamp units 23. Each hydraulic prop 22 is fixedly connected to a mold clamp unit 23 at one end away from the closed test chamber 2. This setting of the mold clamp 23 makes a hydraulic prop 22 and a mold clamp unit 23 become a clamping unit, which is more convenient for early installation and later disassembly and maintenance, and can be flexibly adjusted according to the needs of different tests. The anti-slip part can also be made of other elastic, wear-resistant and waterproof materials such as synthetic silicone.

[0037] Reference Figure 1The overall structural sectional view of the water jet rock free surface cutting test device under the submerged jet environment, the pressure servo system includes a pressure water tank 4, a pressure water pump 41, a pressure water pipe 42 and a return water pipe 43. In this embodiment, the pressure water tank 4 and the pressure water pump 41 are both arranged outside the closed experimental chamber 2, and the pressure water tank 4 is separately fixed to the first fixed frame outside the closed experimental chamber 2 by bolts, so that the test space in the closed experimental chamber 2 is larger and easier to operate.

[0038] The pressure water tank 4 is fixed to the upper right of the first fixing frame on the right side of the closed experimental chamber 2 by bolts. A first water outlet for communicating with a pressure water pump 41 is provided on the bottom surface of the pressure water tank 4. The pressure water pump 41 is fixed to the bottom of the pressure water tank 4 by bolts and communicates with the first water outlet of the pressure water tank 4. One end of the pressure water pipe 42 is communicated with the pressure water pump 41, and the other end of the pressure water pipe 42 passes through the first fixing frame and passes through the test support platform 1 to communicate with the lower part of the closed experimental chamber 2 on the test support platform 1. The upper part of the pressure water tank 4 is also provided with a There is a second water outlet, one end of the return water pipe 43 is connected to the second water outlet, and the other end of the return water pipe 43 passes through the first fixed frame, and passes through the dustproof box 5 to be connected with the upper part of the closed experimental chamber 2 in the dustproof box 5; through the above-mentioned connection method, a passage is formed between the pressure supply water tank 4, the pressure supply water pump 41, the pressure supply water pipe 42, the closed experimental chamber 2 and the return water pipe 43, and the pressure supply water pipe 42 and the return water pipe 43 are also respectively installed with a pressure supply control component and a reflux control component to control the liquid pressure in the closed experimental chamber 2.

[0039] When conducting a water jet rock free face cutting test in a submerged jet environment, the pressure water pump 41 is turned on, and the water in the pressure water tank 4 is filled into the closed experimental chamber 2 and the hollow cavity of the test support platform 1 through the pressure water pipe 42, and then flows back to the pressure water tank 4 through the return water pipe 43. In this embodiment, the pressure control component is specifically configured as a pressure water valve 421 installed on the pressure water pipe 42, and the return control component is specifically configured as a return water valve 431 installed on the return water pipe 43. The pressure water valve 421 and the return water valve 431 are both arranged on the pipe bodies of the pressure water pipe 42 and the return water pipe 43 outside the closed experimental chamber 2 and the first fixed frame, so that the test operator can adjust the liquid pressure in the closed experimental chamber 2 at any time by tightening the pressure water valve 421 and the return water valve 431.

[0040] In other embodiments, the pressure supply control component and the reflux control component may be replaced by other structural components that are convenient for controlling the water flow pressure in the pressure supply water pipe 42 and the reflux water pipe 43. Similarly, the pressure supply water tank 4, the pressure supply water pump 41, the pressure supply water pipe 42 and the reflux water pipe 43 may be arranged inside the closed experimental chamber 2, a remote control switch may be arranged inside the pressure supply water pump 41, and the pressure supply control component and the reflux control component may be arranged as remotely controllable control components, as long as it can be ensured that there is enough test space inside the closed experimental chamber 2, and the specific arrangement may be flexible according to the actual test requirements.

[0041] Furthermore, in order to make it more convenient for the test operator to adjust the liquid pressure in the closed experimental chamber 2, an overflow valve 44 is also provided in the first fixed frame. The overflow valve 44 is specifically installed between the pressure water supply pipe 42 and the return water pipe 43, and the overflow valve 44 is connected to the external control device through a wire, so that the test personnel can directly operate the overflow valve 44 through the external control device, thereby accurately controlling the liquid pressure of the closed experimental device.

[0042] The water pressure sensing device 25 is fixed inside the closed test chamber 2 by bolts, and the water pressure sensing device 25 is connected to the instrument outside the closed test chamber 2 by wires, so that the test operator can monitor the liquid pressure in the closed test chamber 2 at any time, and then adjust the liquid pressure in the closed test chamber 2 by controlling the external control device of the overflow valve 44, so that the closed test chamber 2 can be in a high-pressure and constant-pressure environment at any time to simulate the different submerged jet environments in which the rock blocks to be tested are located.

[0043] Reference Figure 1 The overall structural cross-sectional view of the water jet rock free surface cutting test device under the submerged jet environment, the high-pressure water jet system includes a supply water tank 3, a high-pressure water pump 31 and a water jet nozzle 32. In this embodiment, the supply water tank 3 is installed in the second fixed frame outside the closed experimental chamber 2 by bolts, and a pressure supply water outlet is opened on the right side of the supply water tank 3, which is connected to the pressure supply water pump 41. The water jet nozzle 32 is connected to the high-pressure water pump 31 through a connecting water pipe 33. In this embodiment, the connecting water pipe 33 is automatically connected to the high-pressure water pump 31. The water jet nozzle 32 passes through the second fixed frame and extends into the closed experimental chamber 2 through the dustproof box 5. The water jet nozzle 32 is installed at one end of the connecting water pipe 33 extending into the closed experimental chamber 2. The connecting water pipe 33 is provided with one end of the water jet nozzle 32 which is made of flexible material. The water jet nozzle 32 is fixed to the top of the closed experimental chamber 2 through a sliding assembly, and the injection end of the water jet nozzle 32 faces the clamping station of the above-mentioned clamping assembly, so that the water jet nozzle 32 can move in the closed experimental chamber 2 to cut the rock block to be tested.

[0044] Reference Figure 1 The overall structure of the water jet rock free surface cutting test device in the submerged jet environment and the reference Figure 2 The schematic diagram of the structure of the closed test chamber connected to the test support platform and the dustproof box, the sliding assembly includes a sliding rail 24 and a moving slider. In this embodiment, the sliding rail 24 is welded and fixed on the top of the closed test chamber 2, and the length direction of the sliding rail 24 is consistent with the length direction of the closed test chamber 2. The moving slider slides through the sliding rail 24. The water jet nozzle 32 is fixed to the moving slider by bolts. A mobile remote control is provided in the moving slider, so that the water jet nozzle 32 can move and cut the rock block to be tested below on the sliding rail 24 along the length direction of the closed test chamber 2 through the moving slider. By adjusting the moving speed of the moving slider, the optimal nozzle moving speed for the required cutting depth of the rock to be tested in the submerged jet environment can be tested, thereby improving the rock breaking efficiency.

[0045] In other embodiments, the sliding guide rail 24 can also be arranged along the width direction of the closed test chamber 2, so that the water jet nozzle 32 can perform a cutting test on the rock block to be tested along the width direction of the closed test chamber 2, which can be flexibly changed according to the specific needs of the test. Similarly, the supply water tank 3, the high-pressure water pump 31, the water jet nozzle 32 and the connecting water pipe 33 can also be arranged inside the closed test chamber 2, and a remote control switch can be arranged inside the high-pressure water pump 31, as long as it can ensure that there is enough test space inside the closed test chamber 2, which can be flexibly arranged according to the actual test needs.

[0046] The present invention discloses a water jet rock free surface cutting test device under a submerged jet environment. The invention principle is: when conducting a water jet rock free surface cutting test under a submerged jet environment, firstly place the rock block to be tested on the hollow grid 21 of the closed test chamber 2, and use the hydraulic support 22 to extend and retract so that the mold clamp 23 clamps the rock block to be tested, close the switch sliding door 51 on the dustproof box body 5, turn on the pressure water pump 41 and the pressure water valve 421, so that the water in the pressure water tank 4 fills the hollow cavity of the closed test chamber 2 and the test support platform 1 through the pressure water pipe 42, and then open the return water valve 431 to form a liquid passage among the pressure water tank 4, the pressure water pipe 42, the closed test chamber 2, the test support platform 1 and the return water pipe 43, and adjust the pressure water valve 421 and the return water valve 431 to adjust the initial liquid pressure in the closed test chamber 2 through the water pressure sensor 25. The high-pressure water pump 31 is turned on, and the water jet nozzle 32 is driven by the moving slider to move on the moving slide rail to cut the rock block to be tested. During this period, the moving speed of the moving slider can be adjusted to test the rock breaking efficiency of different nozzle moving speeds. During the overall test, since the water jet of the water jet nozzle 32 will also change the liquid environment in the closed experimental chamber 2, the overflow valve 44 can be adjusted by the external control device, and the water pressure sensor device 25 can be combined to monitor the pressure of the liquid environment in the closed experimental chamber 2 at any time, so that the closed experimental chamber 2 can be in a high-pressure and constant-pressure environment at any time, thereby simulating the influence of the submerged jet environment on the water jet cutting rock ability, so as to obtain the nozzle moving speed that matches the required cutting depth, and further improve the rock breaking efficiency.

[0047] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0048] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0049] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A water jet rock free surface cutting test device in a submerged jet environment, characterized in that: It includes: Closed experimental chamber (2); and, a clamping assembly, a high-pressure water jet system, a pressure servo system and a water pressure sensing device (25); The clamping assembly is arranged inside the closed experimental chamber (2) and is used to clamp the rock block to be tested; The high-pressure water jet system comprises a water supply tank (3), a high-pressure water pump (31) and a water jet nozzle (32), wherein the high-pressure water pump (31) is connected to the water supply tank (3), and the water jet nozzle (32) is connected to the high-pressure water pump (31) via a connecting water pipe (33), and the spraying end of the water jet nozzle (32) extends into the closed experimental chamber (2) and faces the clamping station of the clamping assembly, and the water jet nozzle (32) is slidably arranged in the closed experimental chamber (2); The pressure servo system comprises a pressure water supply tank (4), a pressure water supply pump (41), a pressure water supply pipe (42) and a return water pipe (43); the pressure water supply pump (41) is in communication with the pressure water supply tank (4); two ends of the pressure water supply pipe (42) are in communication with the pressure water supply pump (41) and the closed experimental chamber (2), respectively; a pressure supply control component is provided on the pressure water supply pipe (42); two ends of the return water pipe (43) are in communication with the pressure water supply tank (4) and the closed experimental chamber (2), respectively; a return water pipe (43) is provided with a return flow control component; The water pressure sensing device (25) is arranged in the closed experimental chamber (2) and is used to monitor the pressure in the closed experimental chamber (2).

2. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The pressure servo system further comprises an overflow valve (44), wherein the overflow valve (44) is arranged between the pressure water supply pipe (42) and the return water pipe (43).

3. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: A sliding guide rail (24) is arranged at the top of the closed experimental chamber (2), a movable slider is arranged on the sliding guide rail (24) along the length direction of the sliding guide rail (24), and the water jet nozzle (32) is arranged on the movable slider.

4. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The clamping assembly comprises a plurality of hydraulic supports (22) and a plurality of mold clamping blocks (23); one end of the hydraulic support (22) is connected to the side wall of the closed experimental chamber (2), and the other end is connected to a single mold clamping block (23).

5. The water jet rock free surface cutting test device in a submerged jet environment according to claim 4, characterized in that: The mold clamping block (23) is provided with an anti-slip member on one side facing the clamping station.

6. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: A test support platform (1) is also connected below the closed test chamber (2); the bottom plate of the closed test chamber (2) is provided as a hollow grid (21); and the interior of the test support platform (1) is hollow.

7. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The closed experimental chamber (2) is made of tempered glass.

8. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The enclosed experimental chamber (2) is provided with a dustproof box (5) on its outer shell, and a switchable sliding door (51) is provided on the dustproof box (5).

9. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The pressure supply control component is configured as a pressure supply water valve (421).

10. The water jet rock free surface cutting test device in a submerged jet environment according to claim 1, characterized in that: The reflux control component is configured as a reflux water valve (431).

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