Hydraulic uranium in-situ leaching well multi-stage piston liquid extraction method

Abstract

The hydraulic uranium in-situ leaching well leaching solution multi-stage piston extraction method is applied to a hydraulic uranium in-situ leaching well leaching solution multi-stage piston extraction system; the hydraulic uranium in-situ leaching well leaching solution multi-stage piston extraction system comprises an extraction mechanism, a cable-pipe composite, a steel cable fixing frame, a winch, a water pump, a liquid storage pool and a hydraulic station. The method steps are as follows: S01, connecting and lowering the extraction mechanism; S02, pipeline connection and steel cable fixation; S03, extracting the in-situ leaching solution in the uranium in-situ leaching well. The present application is used for extracting the in-situ leaching solution under the deep water of the uranium in-situ leaching well, can meet the requirement of 6-10 m 3 / h of the liquid extraction flow, and has the advantages of large liquid extraction flow, relatively low power consumption and relatively low cost compared with the traditional deep water submersible pump when the water extraction depth is below 250 m.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of in-situ leaching of uranium, and particularly to a hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction method suitable for in-situ leaching uranium mine well leaching solution extraction. BACKGROUND

[0002] In-situ leaching of uranium is a very advanced mining technology in the world. Its basic principle is to arrange in-situ leaching uranium mine wells (including liquid injection wells and liquid pumping wells) according to a certain grid on the in-situ leachable sandstone type uranium mine. The in-situ leaching liquid is injected from the liquid injection well, so that the in-situ leaching liquid fully reacts with the uranium ore to form a solution containing uranium ions. The solution containing uranium ions penetrates into the liquid pumping well through the stratum, and the solution containing uranium ions is extracted from the liquid pumping well to the ground surface and then input into an ion exchange tower for further extraction of uranium.

[0003] The in-situ leaching uranium mine well liquid pumping flow rate required by related uranium mining enterprises is 6-10 m 3 / h. If the liquid pumping speed is too low, the economic requirements of in-situ leaching of uranium cannot be met. The depth of the in-situ leaching uranium mine well is usually 200-500 m. At present, a deep well submersible pump is usually used to extract the leaching solution in the well. Because there is a certain gap between the pump body and the blade of the deep well submersible pump (vane pump), the deep well submersible pump has an unavoidable gap leakage (internal leakage) problem. Moreover, as the submersion depth (lift) increases, the gap leakage problem of the deep well submersible pump becomes more and more serious, resulting in more and more serious flow loss.

[0004] In summary, the extraction of the in-situ leaching uranium mine well leaching solution has the following problems to be solved: 1. As the submersion depth increases, the number of deep well submersible pumps required to achieve the specified liquid pumping flow rate also increases, and the purchase cost and operating power consumption also increase accordingly; 2. When the submersion depth reaches 250 m, the deep well submersible pump has difficulty in meeting the requirements of the in-situ leaching uranium mine well liquid pumping flow rate due to the flow loss phenomenon. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art and provide a hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction method. It is applied to a hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction system, and solves the problem that the existing deep well submersible pump used to extract the leaching solution under water in the in-situ leaching uranium mine well has high cost and power consumption, and the liquid pumping flow rate is difficult to meet the requirements.

[0006] The technical scheme of the present application is: a hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction method is applied to a hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction system, and is used to extract the leaching solution in the in-situ leaching uranium mine well.

[0007] The hydraulic in-situ leaching uranium mine leaching solution multi-stage piston extraction system comprises an extraction mechanism, a cable pipe composite, a steel cable fixing frame, a winch, a water pump, a liquid storage pool and a hydraulic station.

[0008] The liquid extracting mechanism comprises a shell assembly, a cylinder, a push-pull rod A, a push-pull rod B, a coupling head, a piston A and a piston B; the shell assembly is sequentially provided with a drainage and oil passage section, a double-wall cylinder section, an upper two-way communication section, a repeated unit section, a lower double-wall water cylinder section and a lower two-way communication section from one end to the other end; the drainage and oil passage section is internally provided with an oil passage channel and a water collection passage which are not communicated with each other, the oil passage channel is provided with an oil inlet and an oil outlet at the end of the shell assembly, the water collection passage is provided with a water outlet at the end of the shell assembly, and an external thread is arranged on the outer wall of the water outlet; the double-wall cylinder section is internally provided with a cylinder mounting cavity and an annular water cavity A which are not communicated with each other; the upper two-way communication section is internally provided with a water inlet channel A, a drainage channel A and a moving guide channel A; the repeated unit section comprises a middle double-wall water cylinder section and a middle two-way communication section which are connected with each other; the middle double-wall water cylinder section is internally provided with a middle piston cavity and an annular water cavity B which are not communicated with each other; the middle two-way communication section is internally provided with a water inlet channel B, a drainage channel B and a moving guide channel B; the lower double-wall water cylinder section is internally provided with a lower piston cavity and an annular water cavity C which are not communicated with each other; the lower two-way communication section is internally provided with a water inlet channel C and a drainage channel C which are not communicated with each other; the cylinder body of the cylinder is fixedly installed at the front end of the cylinder mounting cavity, and the piston rod of the cylinder extends to the rear end of the cylinder mounting cavity; the cylinder body of the cylinder is in communication with the rear end of the oil passage channel; the push-pull rod A is sealingly and slidably installed in the moving guide channel A, and the front and rear ends of the push-pull rod A extend into the cylinder mounting cavity and the middle piston cavity, respectively; the push-pull rod B is sealingly and slidably installed in the moving guide channel B, and the front and rear ends of the push-pull rod B extend into the middle piston cavity and the lower piston cavity, respectively; the coupling head is arranged between the front end of the push-pull rod A and the piston rod of the cylinder, and integrally connects the front end of the push-pull rod A and the piston rod of the cylinder, so that the cylinder and the push-pull rod A move synchronously; the piston A is sealingly and slidably installed in the middle piston cavity, and is connected with the rear end of the push-pull rod A and the front end of the push-pull rod B at the two ends, respectively; and the piston B is sealingly and slidably installed in the lower piston cavity, and is connected with the rear end of the push-pull rod B.

[0009] The cable-pipe composite body comprises a steel cable fixing device, a pipe end fixing device, a water pipe, a steel cable, an oil pipe and an anti-winding device; the steel cable fixing device is provided with an avoiding hole for the water outlet of the liquid lifting mechanism to pass through in the middle part, and the outer side of the steel cable fixing device is provided with two steel cable through holes and two oil pipe limiting notches A which are uniformly distributed around the avoiding hole; the pipe end fixing device comprises an inner sleeve and an outer sleeve, the inner sleeve and the outer sleeve are threadedly connected at the lower end, the inner sleeve is located inside the outer sleeve, the inner sleeve is provided with an internal thread in the lower end inner hole, and the inner sleeve and the outer sleeve jointly form a conical ring clamping interval for clamping the lower end of the water pipe at the upper end; the lower end of the water pipe is fixedly connected in the conical ring clamping interval of the pipe end fixing device, and the upper end of the water pipe is provided with a water pipe quick connector B; the steel cable is bent into a U shape as a whole, the two ends of the steel cable respectively pass through the steel cable through holes of the steel cable fixing device and extend out of the upper end of the steel cable fixing device, the two cable bodies of the steel cable are arranged in parallel to the water pipe, the two cable bodies of the steel cable are symmetrically distributed outside the water pipe, and the two ends of the steel cable are respectively provided with a steel cable quick connector B; two oil pipes for oil inlet and oil outlet are symmetrically distributed outside the water pipe, the two oil pipes are arranged in parallel to the water pipe, the lower ends of the two oil pipes respectively pass through the two oil pipe limiting notches A of the steel cable fixing device, and the upper ends of the two oil pipes are respectively provided with an oil pipe quick connector B; a plurality of anti-winding devices are arranged at intervals along the length direction of the cable-pipe composite body, the anti-winding device is provided with a water pipe through hole in the middle part for the water pipe to pass through, the anti-winding device is further provided with two steel cable limiting notches and two oil pipe limiting notches B which are communicated to the water pipe through hole, the anti-winding device forms an interference fit with the two cable bodies of the steel cable through the two steel cable limiting notches, and the two oil pipes pass through the anti-winding device through the two oil pipe limiting notches B; the cable-pipe composite body as a whole is a flexible linear body, the anti-winding device is a rigid node on the flexible linear body, and the cable-pipe composite body limits the relative positions of the water pipe, the steel cable and the oil pipe through the anti-winding device; the two oil pipes of the cable-pipe composite body are respectively fixedly connected to the oil inlet and the oil outlet of the liquid lifting mechanism at the lower end; the steel cable fixing device of the cable-pipe composite body embraces the water outlet of the liquid lifting mechanism through the avoiding hole, and the lower end faces of the steel cable fixing device and the pipe end fixing device are in abutment;

[0010] The winch is provided with a winding drum, the winding drum is wound with a cable, and the lower end of the cable is provided with a composite connector, the composite connector comprises two steel cable quick connectors A, two oil pipe quick connectors A and one water pipe quick connector A, the steel cable quick connector A is used for docking or separating with the steel cable quick connector B in the cable-pipe composite body, the oil pipe quick connector A is used for docking or separating with the oil pipe quick connector B in the cable-pipe composite body, and the water pipe quick connector A is used for docking or separating with the water pipe quick connector B in the cable-pipe composite body; the winch is arranged on the ground outside the in-situ leaching uranium mine;

[0011] The steel cable fixing frame comprises a base frame, a U-shaped clamping piece and a nut; the base frame comprises two parallel arranged channel steels and a connecting rod fixedly connected between the two channel steels, the area between the two channel steels is defined as the inner side of the base frame, and the area outside the two channel steels is defined as the outer side of the base frame; the U-shaped clamping piece has a closed end at one end and an open end at the other end, the two rod ends of the open end of the U-shaped clamping piece are provided with external threads, the two rod ends of the U-shaped clamping piece pass through the two side groove walls of one channel steel of the base frame, and then the nut threaded on the rod ends is locked on the channel steel of the base frame, the closed end of the U-shaped clamping piece is located at the inner side of the base frame, the open end of the U-shaped clamping piece is located at the outer side of the base frame, and a clamping area is formed between the closed end of the U-shaped clamping piece and the channel steel of the base frame; two U-shaped clamping pieces clamp and fix two cable bodies of the steel cable through the clamping areas respectively; the base frame of the steel cable fixing frame is fixedly arranged or placed directly above the well mouth of the in-situ leaching uranium mine;

[0012] The water pump is fixedly arranged on the ground outside the in-situ leaching uranium mine, and is provided with a water inlet port and a water outlet port; the water inlet port is connected with a water pipe quick connector C; the water outlet port of the water pump is connected to the liquid storage tank through a pipeline; the water pipe quick connector C of the water pump is used for docking or separating with the water pipe quick connector B in the cable-pipe composite; the hydraulic station is arranged on the ground outside the in-situ leaching uranium mine, and is provided with two oil pipe quick connectors C; the hydraulic station is connected to the oil pipe quick connector B of the cable-pipe composite through the two oil pipe quick connectors C.

[0013] S01, connecting and lowering the liquid lifting mechanism:

[0014] a, connecting the water pipe quick connector B of the cable-pipe composite to the water pipe quick connector A of the composite connector of the winch, connecting the steel cable quick connector B of the cable-pipe composite to the steel cable quick connector A of the composite connector of the winch, connecting the oil pipe quick connector B of the cable-pipe composite to the oil pipe quick connector A of the composite connector of the winch, and connecting the lower ends of the two oil pipes of the cable-pipe composite to the oil inlet and oil outlet of the liquid lifting mechanism respectively;

[0015] b, driving the drum of the winch to rotate, winding the cable-pipe composite on the drum, and making the liquid lifting mechanism in a suspended state; at this time, the winch is connected to and bears the liquid lifting mechanism through the steel cable and the pipe end fixing device in sequence;

[0016] c, driving the winch to move, so that the liquid lifting mechanism is located directly above the well mouth of the in-situ leaching uranium mine; driving the drum of the winch to rotate, and lowering the liquid lifting mechanism to a preset depth in the well; at this time, the composite connector of the winch is located directly above the well mouth of the in-situ leaching uranium mine;

[0017] S02, pipe connection and steel cable fixation:

[0018] a、disconnect the connection between tubing quick connector B of the cable-tubing complex and tubing quick connector A of the composite connector, and then connect tubing quick connector B to tubing quick connector C of the hydraulic station; after connection, the oil circuit is connected, and the two oil pipes are used for oil inlet and outlet respectively;

[0019] b、disconnect the connection between water quick connector B of the cable-tubing complex and water quick connector A of the composite connector, and then connect water quick connector B to water quick connector C of the water pump; after connection, the water circuit is connected;

[0020] c、disconnect the connection between steel cable quick connector B of the cable-tubing complex and steel cable quick connector A of the composite connector; after disconnection, the water pipe and the two oil pipes are temporarily used for connection and load bearing of the liquid lifting mechanism; the two cable bodies of the steel cable are fixed through the two U-shaped clamping members of the steel cable fixing frame, and after fixing, the two cable bodies of the steel cable are clamped in the two clamping areas of the steel cable fixing frame; the steel cable fixing frame is connected to the liquid lifting mechanism through the steel cable and pipe end fixing device in sequence;

[0021] S03, extracting in-situ leaching liquid in the in-situ leaching uranium mine:

[0022] On the one hand, the hydraulic station is started, and the piston rod of the oil cylinder is driven to move in and out by hydraulic power, so as to continuously extract the leaching liquid; on the other hand, the water pump is started, so that the leaching liquid extracted to the outside of the well mouth can flow to the liquid storage pool;

[0023] When the piston rod of the oil cylinder is extended, the following effects are simultaneously generated:

[0024] 1. The piston A moves downward, so that the volume of the middle front cavity is expanded to generate negative pressure; under the action of the negative pressure, the in-situ leaching liquid in the well enters the water inlet channel A through the water inlet A, and then enters the middle front cavity through the first one-way valve, so as to realize liquid suction;

[0025] 2. The piston B moves downward, so that the volume of the lower front cavity is expanded to generate negative pressure; under the action of the negative pressure, the in-situ leaching liquid in the well enters the water inlet channel B through the water inlet B, and then enters the lower front cavity through the fourth one-way valve, so as to realize liquid suction;

[0026] 3. The piston A moves downward, so that the volume of the middle rear cavity is reduced to generate positive pressure; under the action of the positive pressure, the liquid in the middle rear cavity enters the water outlet channel in sequence through the third water inlet branch with the fifth one-way valve, the water outlet channel B, the merging channel section, the annular water cavity B, the first water inlet branch, the water outlet channel A and the annular water cavity A, and then is transported to the outside of the well mouth through the water pipe, and finally flows into the liquid storage pool through the suction force of the water pump;

[0027] 4. The piston B moves downward, the volume of the lower rear chamber is reduced to produce positive pressure, under the action of positive pressure, the liquid in the lower rear chamber in turn through the drainage channel C with the eighth one-way valve, annular water cavity C, the fifth water inlet branch, drainage channel B, convergence channel section, annular water cavity B, the first water inlet branch, drainage channel A and annular water cavity A, into the summary water outlet channel, and then through the water pipe to the wellhead outside, finally through the suction force of water pump into the storage pool;

[0028] When the piston rod of the oil cylinder retracts, the following effects are produced at the same time:

[0029] 1. The piston A moves upward, the volume of the middle rear chamber is expanded to produce negative pressure, under the action of negative pressure, the leaching liquid in the well enters the water inlet channel B through the water inlet B, and then enters the middle rear chamber through the third one-way valve, realizing liquid absorption;

[0030] 2. The piston B moves upward, the volume of the lower rear chamber is expanded to produce negative pressure, under the action of negative pressure, the leaching liquid in the well enters the water inlet channel C through the water inlet C, and then enters the lower rear chamber through the seventh one-way valve, realizing liquid absorption;

[0031] 3. The piston A moves upward, the volume of the middle front chamber is reduced to produce positive pressure, under the action of positive pressure, the liquid in the middle front chamber in turn through the second water inlet branch with the second one-way valve, drainage channel A and annular water cavity A, into the summary water outlet channel, and then through the water pipe to the wellhead outside, finally through the suction force of water pump into the storage pool;

[0032] 4. The piston B moves upward, the volume of the lower front chamber is reduced to produce positive pressure, under the action of positive pressure, the liquid in the lower front chamber in turn through the fourth water inlet branch with the sixth one-way valve, drainage channel B, convergence channel section, annular water cavity B, the first water inlet branch, drainage channel A and annular water cavity A, into the summary water outlet channel, and then through the water pipe to the wellhead outside, finally through the suction force of water pump into the storage pool.

[0033] The further technical scheme of the present application is: the shell assembly is cylindrical; in the drainage and oil passage section, the oil passage and the front end of the water outlet passage are both communicated to the end face of the shell assembly; in the double-wall oil cylinder section, the annular water cavity A is arranged outside the oil cylinder mounting cavity, the front end of the annular water cavity A is communicated to the rear end of the water outlet passage, and the front end of the oil cylinder mounting cavity is communicated to the rear end of the oil passage; in the upper two-way communication section, the water inlet passage A, the drainage passage A and the moving guide passage A are not communicated with each other; the front end of the water inlet passage A is communicated to the outer circular face of the shell assembly to form a water inlet A, and the water inlet passage A is provided with a first one-way valve; the front end of the drainage passage A is communicated to the rear end of the annular water cavity A, the rear end of the drainage passage A is provided with a first water inlet branch and a second water inlet branch, and the second water inlet branch is provided with a second one-way valve; the front end of the moving guide passage A is communicated to the rear end of the oil cylinder mounting cavity; in the middle double-wall water cylinder section, the annular water cavity B is arranged outside the middle piston cavity, the front end of the annular water cavity B is communicated to the first water inlet branch of the drainage passage A, and the front end of the middle piston cavity is respectively communicated to the second water inlet branch of the drainage passage A, the rear end of the water inlet passage A and the rear end of the moving guide passage A; in the middle two-way communication section, the water inlet passage B, the drainage passage B and the moving guide passage B are not communicated with each other; the middle part of the water inlet passage B is provided with a water inlet B communicated to the outer circular face of the shell assembly, both ends of the water inlet passage B are respectively provided with a third one-way valve and a fourth one-way valve, and the end of the water inlet passage B provided with the third one-way valve is communicated to the rear end of the middle piston cavity; the front end of the drainage passage B is provided with a third water inlet branch and a confluence passage section, the third water inlet branch is provided with a fifth one-way valve, the third water inlet branch is communicated to the rear end of the middle piston cavity, the confluence passage section of the drainage passage B is communicated to the rear end of the annular water cavity B, the rear end of the drainage passage B is provided with a fourth water inlet branch and a fifth water inlet branch, and the fourth water inlet branch is provided with a sixth one-way valve; the front end of the moving guide passage B is communicated to the rear end of the middle piston cavity; in the lower double-wall water cylinder section, the annular water cavity C is arranged outside the lower piston cavity, the front end of the annular water cavity C is communicated to the fifth water inlet branch of the drainage passage B, and the front end of the lower piston cavity is respectively communicated to the end of the water inlet passage B provided with the fourth one-way valve, the fourth water inlet branch of the drainage passage B and the rear end of the moving guide passage B; in the lower two-way communication section, the water inlet passage C is provided with a seventh one-way valve, the front end of the water inlet passage C is communicated to the outer circular face of the shell assembly to form a water inlet C, and the rear end of the water inlet passage C is communicated to the rear end of the lower piston cavity; the drainage passage C is provided with an eighth one-way valve, the front end of the drainage passage C is communicated to the rear end of the lower piston cavity, and the rear end of the drainage passage C is communicated to the rear end of the annular water cavity C.

[0034] Further, the shell assembly is provided with a pressure relief valve communicated to the annular water cavity C on the outer wall of the lower two-way communication section, and the pressure relief pressure of the pressure relief valve is 4-5 MPa; the hydraulic uranium in-situ leaching well leaching solution multi-stage piston liquid extraction system further comprises a high-pressure air charging device, the high-pressure air charging device is provided with a water pipe quick connector D for outputting high-pressure air, the high-pressure air charging device is connected or separated with the water pipe quick connector B of the cable-pipe composite through the water pipe quick connector D, and the highest air charging pressure provided by the high-pressure air charging device is not less than 5 MPa;

[0035] The method further comprises a step S04 subsequent to the step S03;

[0036] S04, lifting and dismounting the liquid extraction mechanism:

[0037] First, the winch is driven to move, so that the composite connector on the winch is located directly above the well mouth of the in-situ leaching uranium mine, then the steel cable quick connector B of the cable-pipe composite is connected to the steel cable quick connector A of the composite connector, then the two U-shaped clamps are removed from the bottom frame of the steel cable fixing frame, so that the steel cable is disconnected from the steel cable fixing frame, at this time, the winch is connected to and bears the liquid extraction mechanism through the steel cable and the pipe end fixing device in sequence;

[0038] The connection between the water pipe quick connector B of the cable-pipe composite and the water pipe quick connector C of the water pump is disconnected, the water pipe quick connector B is connected to the water pipe quick connector D of the high-pressure air charging device, high-pressure air is charged into the water pipe through the high-pressure air charging device, the water in the water pipe flows downward, and sequentially passes through the water outlet channel, the annular water cavity A, the water outlet channel A, the annular water cavity B and the water outlet channel B to enter the annular water cavity C, and then is discharged to the in-situ leaching uranium mine after the pressure relief valve is opened, at this time, the residual leaching solution in the water pipe is replaced by the high-pressure air;

[0039] The air supply of the high-pressure air charging device is stopped, the connection between the water pipe quick connector B of the cable-pipe composite and the water pipe quick connector D of the high-pressure air charging device is disconnected, and the water pipe quick connector B is connected to the water pipe quick connector A of the winch composite connector; the connection between the oil pipe quick connector B of the cable-pipe composite and the oil pipe quick connector C of the hydraulic station is disconnected, and the oil pipe quick connector B is connected to the oil pipe quick connector A of the winch composite connector;

[0040] The drum of the winch is driven to rotate, on one hand, the cable-pipe composite is wound on the drum, on the other hand, the liquid extraction mechanism is lifted to above the well mouth of the in-situ leaching uranium mine; finally, the connection between the lower ends of the two oil pipes and the oil inlets and outlets of the liquid extraction mechanism is disconnected, the steel cable fixing device and the pipe end fixing device are removed from the water outlet of the liquid extraction mechanism, so that the liquid extraction mechanism is separated from the cable-pipe composite;

[0041] In this step, the pressure of the high-pressure air is not less than 5 MPa, and the pressure relief pressure of the pressure relief valve is 4-5 MPa.

[0042] The further technical solution of the present application is that the number of the repeating unit sections is one section.

[0043] Compared with the prior art, the present application has the following advantages:

[0044] 1. The liquid extraction method is used for extracting the leaching liquid under the deep water of the in-situ leaching uranium mine, and can meet the requirement of the liquid extraction flow of 6-10 m3 / h. When the water extraction depth is below 250 m, compared with the traditional deep water submersible pump, the liquid extraction flow is large, the power consumption is relatively low, and the cost is relatively low.

[0045] 2. In the process of recovering the liquid extraction mechanism, the high-pressure air charging device is used to charge air into the water pipe, the residual leaching liquid in the water pipe is pushed downward by the high-pressure air, and finally, the leaching liquid flows out of the pressure relief valve on the liquid extraction mechanism and into the in-situ leaching uranium mine. Based on the above air charging operation, on the one hand, the leaching liquid in the water pipe is replaced by air, which effectively reduces the weight of the cable-pipe composite, facilitates the winding and recovery of the cable-pipe composite by the winch, on the other hand, the length of the water pipe can reach hundreds of meters, and the amount of residual leaching liquid in the water pipe is large, the residual leaching liquid in the water pipe is discharged into the in-situ leaching uranium mine under the action of air pressure, which avoids the waste of the residual leaching liquid in the water pipe, and on the other hand, a part of the leaching liquid in the liquid extraction mechanism is replaced by air, which provides a certain buoyancy for the liquid extraction mechanism, and effectively reduces the power consumption of the winch for recovering the liquid extraction mechanism.

[0046] 3. Considering that the inner diameter of the in-situ leaching uranium mine is relatively narrow (the inner diameter of the well is less than 150 mm), when designing the waterway, on the one hand, it is necessary to meet the space feasibility as much as possible, and on the other hand, it is necessary to expand the cross-sectional area of the water inlet and outlet as much as possible under the premise of meeting the structural strength, therefore, the section where the oil cylinder and the piston (including piston A and piston B) are arranged inside the shell assembly is designed as an annular water cavity for water outlet, and the section where the water inlets (including water inlet A, water inlet B and water inlet C) are arranged outside the shell assembly is designed as multiple annularly distributed water inlet channels and water outlet channels for water inlet and outlet. Compared with the single water inlet and outlet channel, on the one hand, the utilization of the internal space of the shell assembly is more sufficient, and on the other hand, a relatively larger water inlet and outlet cross-sectional area can be provided.

[0047] 4. The piston adopts a split threaded connection structure, which is convenient for installation and assembly. Two groups of Y-shaped sealing rings and one group of O-shaped sealing rings are arranged on the piston to fully meet the sealing needs when the piston slides. The anti-wear ring is arranged in the middle of the piston, which plays a guiding role when the piston moves, avoids one-sided wear of the Y-shaped sealing ring and leads to sealing failure, and on the other hand, can reduce the wear probability of the piston body and play a certain protection role for the piston body.

[0048] 5. When the number of repeating unit segments is one (as shown in Example 1), it is a two-stage piston structure. Experimental results show that the pumping flow rate can reach 8m³ / s. 3 / h, which can meet the liquid pumping flow rate of 6-10m 3 The requirement is / h. When the number of repeating unit segments is 2, it is a three-stage piston structure. Experimentally, the pumping flow rate can reach 11m³ / h. 3 On the one hand, this will lead to an increase in pressure in the annular water cavity, and the walls on both sides of the annular water cavity also need to be thickened accordingly. The overall radial dimension of the housing assembly will also increase accordingly, making it difficult to meet the space feasibility requirements. On the other hand, it also puts forward higher requirements for the sealing performance of the seals, and the grade and cost of the seals will also increase accordingly. Furthermore, the force required for the operation of the hydraulic cylinder will also be greater, which will lead to the need to design thicker pipe walls for the oil circuit, thus increasing the overall radial dimension of the housing assembly and making it difficult to meet the space feasibility requirements. In summary, a repeating unit segment of 1 segment is the optimal choice.

[0049] 6. Its application scenario is in-situ leaching uranium mines with a depth of 200-300m. The shell assembly withstands significant water pressure, therefore the channels cannot be designed too thin (i.e., there are minimum requirements for channel wall thickness). Thus, a channel pattern based on central symmetry is adopted in the upper and middle bidirectional connecting sections, with four inlet and four drainage channels each. Based on this arrangement, on the one hand, the internal space of the upper and middle bidirectional connecting sections is fully utilized, providing a relatively larger inlet and drainage cross-sectional area within the limited design space, in order to meet the theoretically designed inlet and drainage volume (6-10m³). 3 / h) requirements, on the other hand, this channel style based on central symmetry helps to keep the center of gravity of the housing assembly in the center and the stability during water lifting operations, avoiding lateral (radial) tilting of the housing assembly during water lifting operations or when stationary.

[0050] The present invention will be further described below with reference to the figures and embodiments. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of the present invention;

[0052] Figure 2 for Figure 1 Enlarged view of segment I;

[0053] Figure 3 for Figure 1 Enlarged view of segment II;

[0054] Figure 4 for Figure 1 Enlarged view of segment III;

[0055] Figure 5 The formal perspective view of the winch position when the lifting mechanism is lowered or lifted;

[0056] Figure 6 The plan view of the winch position when the lifting mechanism is lowered or lifted;

[0057] Figure 7 The E-E sectional view of Figure 3 ;

[0058] Figure 8 The F-F sectional view of Figure 3 ;

[0059] Figure 9 The schematic view of the positional relationship between the steel cable fixing device and the pipe end fixing device;

[0060] Figure 10 The schematic view of the structure of the steel cable fixing device;

[0061] Figure 11 The plan view of Figure 10 ;

[0062] Figure 12 The schematic view of the structure of the anti-winding device;

[0063] Figure 13 The plan view of Figure 12 ;

[0064] Figure 14 The schematic view of the end surface structure of the lifting mechanism;

[0065] Figure 15 The A-A sectional view of Figure 14 ;

[0066] Figure 16 The B-B sectional view of Figure 14 ;

[0067] Figure 17 The enlarged view of the first section Figure 15 ;

[0068] Figure 18 The enlarged view of the second section Figure 15 ;

[0069] Figure 19 The enlarged view of the third section Figure 15 ;

[0070] Figure 20 The enlarged view of the fourth section Figure 15 ;

[0071] Figure 21 The enlarged view of the first section Figure 16 ;

[0072] Figure 22 Figure 1 is a perspective view of a piston according to the present application; Figure 16 Figure 2 is a sectional view taken along line II-II of Figure 1;

[0073] Figure 23 Figure 3 is a sectional view taken along line III-III of Figure 1; Figure 16 Figure 4 is a sectional view taken along line IV-IV of Figure 1;

[0074] Figure 24 Figure 5 is a sectional view taken along line V-V of Figure 1; Figure 16 Figure 6 is a sectional view taken along line VI-VI of Figure 1;

[0075] Figure 25 Figure 7 is a sectional view taken along line VII-VII of Figure 1; Figure 18 Figure 8 is a sectional view taken along line VIII-VIII of Figure 1;

[0076] Figure 26 Figure 9 is a sectional view taken along line IX-IX of Figure 1; Figure 19 Figure 10 is a sectional view taken along line X-X of Figure 1;

[0077] Figure 27 Figure 11 is a sectional view taken along line XI-XI of Figure 1; Figure 20 Figure 12 is a sectional view taken along line XII-XII of Figure 1;

[0078] Figure 28 Figure 13 is a sectional view taken along line XIII-XIII of Figure 1; Figure 22 Figure 14 is a sectional view taken along line XIV-XIV of Figure 1;

[0079] Figure 29 Figure 15 is a schematic view of the structure of the piston A;

[0080] Figure 30 Figure 16 is a schematic view of the structure of the piston B;

[0081] Figure 31 Figure 17 is a schematic view of the structure of the gyrator A in the piston A;

[0082] Figure 32 Figure 18 is a schematic view of the structure of the gyrator B in the piston A;

[0083] Figure 33 Figure 19 is a schematic view of the structure of the gyrator C in the piston B;

[0084] Figure 34 Figure 20 is a schematic view of the structure of the gyrator D in the piston B;

[0085] Figure 35 Figure 21 is a radial sectional view of the screwing sleeve.

[0086] Legend: Drainage and oil path section 11; Oil path channel 111; Aggregated water outlet channel 112; Water outlet 113; Double-wall oil cylinder section 12; Oil cylinder installation cavity 121; Annular water cavity A 122; Upper two-way communication section 13; Water inlet channel A 131; Drainage channel A 132; First water inlet branch 1321; Second water inlet branch 1322; First one-way valve 133; Second one-way valve 134; Middle double-wall water cylinder section 14; Middle front cavity 1411; Middle rear cavity 1412; Annular water cavity B 142; Middle two-way communication section 15; Water inlet channel B 151; Drainage channel B 152; Third water inlet branch 1521; Converging channel section 1522; Fourth water inlet branch 1523; Fifth water inlet branch 1524; Third one-way valve 153; Fourth one-way valve 154; Fifth one-way valve 155; Sixth one-way valve 156; Lower double-wall water cylinder section 16; Lower front cavity 1611; Lower rear cavity 1612; Annular water cavity C 162; Lower two-way communication section 17; Water inlet channel C 171; Drainage channel C 172; Seventh one-way valve 173; Eighth one-way valve 174; Oil cylinder 21; Push-pull rod A 22; Pull rod B 23; Coupling head 24; Piston A 3; Swivel body A 31; First sealing section 311; First annular boss 312; First external thread section 313; Second sealing section 314; First installation section 315; First shaft end positioning section 316; Cover plate 317; Second shaft end positioning section 318; Swivel body B 32; Second installation section 321; Second annular boss 322; Third sealing section 323; First internal thread section 324; Fourth sealing section 325; Third installation section 326; Knuckle bearing A 33; First anti-wear ring 34; Piston B 4; Swivel body C 41; Fifth sealing section 411; Third annular boss 412; Second external thread section 413; Sixth sealing section 414; Fourth installation section 415; Third shaft end positioning section 416; Swivel body D 42; Fifth installation section 421; Fourth annular boss 422; Seventh sealing section 423; Second internal thread section 424; Eighth sealing section 425; Knuckle bearing B 43; Second anti-wear ring 44; Steel cable fixing device 51; Avoidance hole 511; Steel cable through hole 512; Oil pipe limiting notches A 513; Pipe end fixing device 52; Inner sleeve 521; Outer sleeve 522; Water pipe 53; Steel cable 54; Oil pipe 55; Anti-winding device 56; Water pipe through hole 561; Steel cable limiting notches 562; Oil pipe limiting notches B 563; Chassis 61; U-shaped clamping member 62; Nut 63; Winch 71; Drum 711; Steel cable quick connector A 712; Oil pipe quick connector A 713; Water pipe quick connector A 714; Water pump 72; Liquid storage pool 73; Hydraulic station 74; Tightening sleeve 8; Half-ring split body A 81; Half-ring split body B 82; Locking screw 83; Water inlet A 100; Water inlet B 200; Water inlet C 300; Wrench positioning hole 400; Pressure relief valve 500.

[0087] Explanation: Due to the excessively large length-diameter ratio of the cable-pipe composite, it leads to theFigure 1 In the middle, it is difficult to see the structure of the cable pipe composite, so the interval between adjacent anti-winding devices is shortened when drawing, only two anti-winding devices are drawn, and in Figure 1 In the middle, the application is divided into three sections I, II and III in the vertical direction, and then the three sections are drawn respectively, so that the structure of the application is clearly displayed; due to the too large length-diameter ratio of the liquid lifting mechanism, it is difficult to see the structure of the liquid lifting mechanism in Figures 15-16 In the middle, the axial length of each component is shortened (the structure of each component is not changed) when drawing, and in Figures 15-16 In the middle, the liquid lifting mechanism is divided into four sections I, II, III and IV along the axial direction, and then the four sections are drawn respectively, so that the internal structure of the liquid lifting mechanism is clearly displayed. Figures 13-24 The arrow in the middle is the water flow direction; since the structure of the winch is prior art, only the front end structure of the winch is shown in Figures 5-6 In the middle, the rear end structure of the winch is omitted and not drawn. Embodiment Example 1

[0088] As shown in Figures 1-35 , the hydraulic uranium mine leaching liquid multi-stage piston liquid lifting system comprises a liquid lifting mechanism, a winch 71, a cable pipe composite, a steel cable fixing frame, a water pump 72, a liquid pool 73 and a hydraulic station 74.

[0089] The shell assembly is in the shape of a cylinder, which is provided with a drainage and oil passage section 11, a double-wall oil cylinder section 12, an upper two-way communication section 13, a repeated unit section, a lower double-wall water cylinder section 16 and a lower two-way communication section 17 in sequence from one end to the other end.

[0090] The drainage and oil passage section 11 is internally provided with an oil passage channel 111 and a water collection passage 112 which are not communicated with each other, and the front ends of the oil passage channel 111 and the water collection passage 112 are communicated to the end face of the shell assembly. The oil passage channel 111 is provided with an oil inlet and an oil outlet at the end of the shell assembly, and the water collection passage 112 is provided with a water outlet 113 at the end of the shell assembly, and the outer wall of the water outlet 113 is provided with external threads.

[0091] The double-wall oil cylinder section 12 is internally provided with an oil cylinder mounting cavity 121 and an annular water cavity A 122 which are not communicated with each other, and the annular water cavity A 122 is arranged on the outer side of the oil cylinder mounting cavity 121, the front end of the annular water cavity A 122 is communicated with the rear end of the water collection passage 112, and the front end of the oil cylinder mounting cavity 121 is communicated with the rear end of the oil passage channel 111.

[0092] The upper bidirectional communication section 13 is internally provided with a water inlet channel A131, a water discharge channel A132 and a movement guide channel A. The water inlet channel A131, the water discharge channel A132 and the movement guide channel A are not communicated with each other. The front end of the water inlet channel A131 is communicated to the outer circumferential surface of the shell assembly to form a water inlet A100, and the water inlet channel A131 is provided with a first one-way valve 133. The front end of the water discharge channel A132 is communicated to the rear end of the annular water cavity A122, and the rear end of the water discharge channel A132 is provided with a first water inlet branch 1321 and a second water inlet branch 1322, and the second water inlet branch 1322 is provided with a second one-way valve 134. The front end of the movement guide channel A is communicated to the rear end of the oil cylinder mounting cavity 121.

[0093] The repeating unit section includes a middle double-wall water cylinder section 14 and a middle bidirectional communication section 15 connected with each other. The middle double-wall water cylinder section 14 is internally provided with a middle piston cavity and an annular water cavity B142 which are not communicated with each other. The annular water cavity B142 is arranged on the outer side of the middle piston cavity, the front end of the annular water cavity B142 is communicated to the first water inlet branch 1321 of the water discharge channel A132, and the front end of the middle piston cavity is respectively communicated to the second water inlet branch 1322 of the water discharge channel A132, the rear end of the water inlet channel A131 and the rear end of the movement guide channel A. The middle bidirectional communication section 15 is internally provided with a water inlet channel B151, a water discharge channel B152 and a movement guide channel B. The water inlet channel B151, the water discharge channel B152 and the movement guide channel B are not communicated with each other. The middle part of the water inlet channel B151 is communicated to the water inlet B200 of the outer circumferential surface of the shell assembly, both ends of the water inlet channel B151 are respectively provided with a third one-way valve 153 and a fourth one-way valve 154, and the end of the water inlet channel B151 provided with the third one-way valve 153 is communicated to the rear end of the middle piston cavity. The front end of the water discharge channel B152 is provided with a third water inlet branch 1521 and a converging channel section 1522, the third water inlet branch 1521 is provided with a fifth one-way valve 155, the third water inlet branch 1521 is communicated to the rear end of the middle piston cavity, the converging channel section 1522 of the water discharge channel B152 is communicated to the rear end of the annular water cavity B142, the rear end of the water discharge channel B152 is provided with a fourth water inlet branch 1523 and a fifth water inlet branch 1524, and the fourth water inlet branch 1523 is provided with a sixth one-way valve 156. The front end of the movement guide channel B is communicated to the rear end of the middle piston cavity.

[0094] The lower double-wall water cylinder section is internally provided with a lower piston cavity and an annular water cavity C162 which are not communicated with each other. The annular water cavity C162 is arranged on the outer side of the lower piston cavity, the front end of the annular water cavity C162 is communicated to the fifth water inlet branch 1524 of the water discharge channel B152, and the front end of the lower piston cavity is respectively communicated to the end of the water inlet channel B151 provided with the fourth one-way valve 154, the fourth water inlet branch 1523 of the water discharge channel B152 and the rear end of the movement guide channel B.

[0095] The lower two-way communication section is internally provided with a water inlet channel C171 and a drainage channel C172 which are not communicated with each other. The water inlet channel C171 is provided with a seventh one-way valve 173, the front end of the water inlet channel C171 is communicated to the outer cylindrical surface of the shell assembly to form a water inlet C300, and the rear end of the water inlet channel C171 is communicated to the rear end of the lower piston cavity. The drainage channel C172 is provided with an eighth one-way valve 174, the front end of the drainage channel C172 is communicated to the rear end of the lower piston cavity, and the rear end of the drainage channel C172 is communicated to the rear end of the annular water cavity C162.

[0096] The cylinder body of the oil cylinder 21 is fixedly installed at the front end of the oil cylinder installation cavity 121, and the piston rod of the oil cylinder 21 extends to the rear end of the oil cylinder installation cavity 121. Correspondingly, the rear end of the oil passage channel 111 is communicated to the inside of the cylinder body of the oil cylinder 21, thereby providing a path support for the oil inlet and outlet of the oil cylinder 21. The push-pull rod A22 is sealingly and slidingly installed in the moving guide channel A, and the front and rear ends thereof extend into the oil cylinder installation cavity 121 and the middle piston cavity, respectively. The push-pull rod B23 is sealingly and slidingly installed in the moving guide channel B, and the front and rear ends thereof extend into the middle piston cavity and the lower piston cavity, respectively. The coupling head 24 is arranged between the front end of the push-pull rod A22 and the piston rod of the oil cylinder 21, and integrally connects the front end of the push-pull rod A22 and the piston rod of the oil cylinder 21, thereby realizing the synchronous movement of the oil cylinder 21 and the push-pull rod A22.

[0097] The piston A3 is sealingly and slidingly installed in the middle piston cavity, and is connected to the rear end of the push-pull rod A22 and the front end of the push-pull rod B23 at both ends, respectively, thereby dividing the middle piston cavity into a middle front cavity 1411 relatively close to the front end of the middle piston cavity and a middle rear cavity 1412 relatively close to the rear end of the middle piston cavity, and realizing the synchronous movement of the push-pull rod A22 and the push-pull rod B23.

[0098] The piston B4 is sealingly and slidingly installed in the lower piston cavity, and is connected to the rear end of the push-pull rod B23 at one end, thereby dividing the lower piston cavity into a lower front cavity 1611 relatively close to the front end of the lower piston cavity and a lower rear cavity 1612 relatively close to the rear end of the lower piston cavity.

[0099] The cable-pipe composite body comprises a steel cable fixing device 51, a pipe end fixing device 52, a water pipe 53, a steel cable 54, an oil pipe 55 and an anti-winding device 56. The steel cable fixing device 51 is provided with a avoiding hole 511 in the middle for the water outlet 113 of the liquid lifting mechanism to pass through, and is provided with two steel cable through holes 512 and two oil pipe limiting notches A 513 uniformly distributed around the avoiding hole 511 on the outer side. The pipe end fixing device 52 comprises an inner sleeve 521 and an outer sleeve 522, the inner sleeve 521 and the outer sleeve 522 are threadedly connected at the lower end, the inner sleeve 521 is located inside the outer sleeve 522, the inner sleeve 521 is provided with an internal thread in the lower end hole, and the inner sleeve 521 and the outer sleeve 522 jointly form a conical ring clamping interval for clamping the lower end of the water pipe 53 at the upper end. The lower end of the water pipe 53 is fixedly connected in the conical ring clamping interval of the pipe end fixing device 52, and the upper end of the water pipe 53 is provided with a water pipe quick connector B. The steel cable 54 is bent into a U shape as a whole, the two ends of the steel cable 54 respectively pass through the steel cable through holes 512 of the steel cable fixing device 51 and extend out of the upper end of the steel cable fixing device 51, the two cable bodies of the steel cable 54 are arranged parallel to the water pipe 53, and the two cable bodies of the steel cable 54 are symmetrically distributed on the outer side of the water pipe 53, and the two ends of the steel cable 54 are respectively provided with a steel cable quick connector B. Two oil pipes 55 for oil inlet and oil outlet are symmetrically distributed on the outer side of the water pipe 53, and the two oil pipes 55 are arranged parallel to the water pipe 53, the lower ends of the two oil pipes 55 respectively pass through the two oil pipe limiting notches A 513 of the steel cable fixing device 51, and the upper ends of the two oil pipes 55 are respectively provided with an oil pipe quick connector B. A plurality of anti-winding devices 56 are arranged at intervals along the length direction of the cable-pipe composite body, the anti-winding device 56 is provided with a water pipe through hole 561 in the middle for the water pipe 53 to pass through, and is further provided with two steel cable limiting notches 562 and two oil pipe limiting notches B 563 which are communicated to the water pipe through hole 561, the anti-winding device 56 is in interference fit with the two cable bodies of the steel cable 54 through the two steel cable limiting notches 562, and the two oil pipes 55 pass through the anti-winding device 56 through the two oil pipe limiting notches B 563. The cable-pipe composite body is a flexible linear body as a whole, the anti-winding device 56 is a rigid node on the flexible linear body, and the cable-pipe composite body limits the relative positions of the water pipe 53, the steel cable 54 and the oil pipe 55 through the anti-winding device 56. The two oil pipes 55 of the cable-pipe composite body are respectively fixedly connected to the oil inlet and the oil outlet of the liquid lifting mechanism at the lower end. The pipe end fixing device 52 of the cable-pipe composite body is connected to the external thread on the water outlet 113 of the liquid lifting mechanism through the internal thread. The steel cable fixing device 51 of the cable-pipe composite body embraces the water outlet 113 of the liquid lifting mechanism through the avoiding hole 511, and the lower end surface of the steel cable fixing device 51 abuts against the pipe end fixing device 52.

[0100] The steel cable fixing frame comprises a base frame 61, a U-shaped clamp 62 and a nut 63. The base frame 61 comprises two parallel arranged channel steels and a connecting rod fixedly connected between the two channel steels, the area between the two channel steels is defined as the inner side of the base frame, and the area outside the two channel steels is defined as the outer side of the base frame. The U-shaped clamp 62 has a closed end at one end and an open end at the other end, the two rod ends of the open end of the U-shaped clamp 62 are provided with external threads, the two rod ends of the U-shaped clamp 62 pass through the two side groove walls of one channel steel of the base frame 61, and then the nut 63 threaded on the rod ends is locked on the channel steel of the base frame 61, the closed end of the U-shaped clamp 62 is located at the inner side of the base frame 61, the open end of the U-shaped clamp 62 is located at the outer side of the base frame 61, and the closed end of the U-shaped clamp 62 and the channel steel of the base frame 61 form a clamping area. Two U-shaped clamps 62 clamp and fix two cable bodies of the steel cable 54 through the clamping area respectively. The base frame 61 of the steel cable fixing frame is fixedly arranged or placed directly above the wellhead of the in-situ leaching uranium mine.

[0101] The winch 71 is provided with a winding drum 711, a cable is wound on the winding drum 711, and a composite joint is arranged at the lower end of the cable. The composite joint comprises two steel cable quick connectors A 712, two oil pipe quick connectors A 713 and one water pipe quick connector A 714. The steel cable quick connector A 712 is used for docking or separating with the steel cable quick connector B in the cable pipe composite body. The oil pipe quick connector A 713 is used for docking or separating with the oil pipe quick connector B in the cable pipe composite body. The water pipe quick connector A 714 is used for docking or separating with the water pipe quick connector B in the cable pipe composite body. The winch 71 is arranged on the ground outside the in-situ leaching uranium mine. The water pump 72 is fixedly arranged on the ground outside the in-situ leaching uranium mine, and is provided with a water inlet port and a water outlet port. The water inlet port is connected with a water pipe quick connector C. The water outlet port of the water pump 72 is connected to the liquid storage pool 73 through a pipeline. The water pipe quick connector C of the water pump 72 is used for docking or separating with the water pipe quick connector B in the cable pipe composite body. The hydraulic station 74 is arranged on the ground outside the in-situ leaching uranium mine, and is provided with two oil pipe quick connectors C. The hydraulic station 74 docks or separates with the oil pipe quick connector B of the cable pipe composite body through the two oil pipe quick connectors C.

[0102] Preferably, the piston A3 comprises a swivel body A31, a swivel body B32, a joint bearing A33 and a first anti-wear ring 34. The swivel body A31 is in the shape of a sleeve with both ends open, and has a first sealing section 311, a first annular boss 312, a first outer threaded section 313 and a second sealing section 314 arranged in sequence from the front end to the rear end on its outer cylindrical surface, and has a first mounting section 315, a first shaft end positioning section 316, a sealing plate connecting section and a second shaft end positioning section 318 arranged in sequence from the front end to the rear end in its inner hole. The swivel body A31 is welded with a sealing plate 317 at the sealing plate section of the inner hole, and the sealing plate 317 separates the inner hole of the swivel body A31 into two blind holes that are not connected with each other. The swivel body B32 is in the shape of a sleeve with both ends open, and has a second mounting section 321, a second annular boss 322 and a third sealing section 323 arranged in sequence from the front end to the rear end on its outer cylindrical surface, and has a first inner threaded section 324, a fourth sealing section 325 and a third mounting section 326 arranged in sequence from the front end to the rear end in its inner hole. The swivel body A31 is threadedly connected with the first inner threaded section 324 of the swivel body B32 through the first outer threaded section 313, and the second sealing section 314 on the outer cylindrical surface of the swivel body A31 and the fourth sealing section 325 in the inner hole of the swivel body B32 are opposite to each other and are sealed by an O-shaped sealing ring arranged therebetween. The two joint bearings A33 are movably installed in the first mounting section 315 of the swivel body A31 and the third mounting section 326 of the swivel body B32 respectively, and are axially positioned at both ends. The first anti-wear ring 34 is installed on the second mounting section 321 of the swivel body B62, and is axially positioned with both ends abutting against the first annular boss 312 of the swivel body A31 and the second annular boss 322 of the swivel body B32 respectively. The piston A3 is slidably installed in the middle piston cavity through the first anti-wear ring 34, the swivel body A31 faces the middle front cavity 1411 at the front end of the middle piston cavity, and the swivel body B32 faces the middle rear cavity 1412 at the rear end of the middle piston cavity. The Y-shaped sealing ring installed on the first sealing section 311 of the outer cylindrical surface of the swivel body A31 and the Y-shaped sealing ring installed on the third sealing section 323 of the outer cylindrical surface of the swivel body B32 jointly realize the sealing between the piston A3 and the middle piston cavity. Correspondingly, the rear end of the push-pull rod A22 extends into the first shaft end positioning section 316 in the inner hole of the swivel body A31 through the joint bearing A33 in the inner hole of the swivel body A31, and then provides axial positioning for the push-pull rod A22 through the washer and nut installed at the rear end of the push-pull rod A22. Correspondingly, the front end of the push-pull rod B23 extends into the second shaft end positioning section 318 in the inner hole of the swivel body A31 through the joint bearing A33 in the inner hole of the swivel body B32, and then provides axial positioning for the push-pull rod B23 through the washer and nut installed at the front end of the push-pull rod B23.

[0103] Preferably, the piston B4 comprises a swivel body C41, a swivel body D42, a spherical plain bearing B43 and a second anti-wear ring 44. The swivel body C41 is in the shape of a sleeve with two open ends, and has a fifth sealing section 411, a third annular boss 412, a second external thread section 413 and a sixth sealing section 414 arranged in sequence from the front end to the rear end on its outer cylindrical surface, and has a fourth mounting section 415 and a third axial end positioning section 416 arranged in sequence from the front end to the rear end in its inner hole. The swivel body D42 is in the shape of a sleeve with one open end and one closed end, and has a fifth mounting section 421, a fourth annular boss 422 and a seventh sealing section 423 arranged in sequence from the front end to the rear end on its outer cylindrical surface, and has a second internal thread section 424 and an eighth sealing section 425 arranged in sequence from the front end to the rear end in its inner hole. The swivel body C41 is threadedly connected with the second internal thread section 424 of the swivel body D42 through the second external thread section 413, the sixth sealing section 414 on the outer cylindrical surface of the swivel body C41 and the eighth sealing section 425 in the inner hole of the swivel body D42 are opposite to each other and are sealed by an O-shaped sealing ring arranged therebetween. The spherical plain bearing B43 is movably mounted in the fourth mounting section 415 of the swivel body C41 and is axially positioned at both ends. The second anti-wear ring 44 is mounted on the fifth mounting section 421 of the swivel body D42, and is axially positioned with its both ends abutting against the third annular boss 412 of the swivel body C41 and the fourth annular boss 422 of the swivel body D42 respectively. The piston B4 is slidably mounted in the lower piston cavity through the second anti-wear ring 44, the swivel body C41 faces the lower front cavity 1611 at the front end of the lower piston cavity, and the swivel body D42 faces the lower rear cavity 1611 at the rear end of the lower piston cavity. The Y-shaped sealing ring mounted on the fifth sealing section 411 of the outer cylindrical surface of the swivel body C41 and the Y-shaped sealing ring mounted on the seventh sealing section 423 of the outer cylindrical surface of the swivel body D42 jointly realize the sealing between the piston B4 and the lower piston cavity. Correspondingly, the rear end of the push-pull rod B23 extends into the third axial end positioning section 416 in the inner hole of the swivel body C41 through the spherical plain bearing B43 in the inner hole of the swivel body C41, and the axial positioning of the push-pull rod B23 is provided by the washer and nut mounted on the rear end of the push-pull rod B23.

[0104] Preferably, the moving guide channel A in the upper two-way communication section 13 is arranged centrally, the number of the water inlet channels A131 and the water outlet channels A132 is consistent, and each number is four, and all the water inlet channels A131 and all the water outlet channels A132 are uniformly distributed in a ring shape around the moving guide channel A. Based on this arrangement, on the one hand, the internal space of the upper two-way communication section 13 is fully utilized, and the water inlet cross-sectional area and the water outlet cross-sectional area are increased as much as possible in the limited design space, so as to meet the theoretical design requirement of water inlet and outlet capacity (6-10 m 3 / h), and on the other hand, this channel pattern based on central symmetry arrangement helps to keep the center of gravity of the shell assembly centered and stable during water lifting operation, and avoids lateral (radial) tilting of the shell assembly during water lifting operation or static state.

[0105] Preferably, the mobile guide channel B in the middle two-way communication section 15 is arranged centrally, and the number of water inlet channels B151 and water outlet channels B152 is consistent, and all the water inlet channels B151 and all the water outlet channels B152 are uniformly distributed around the mobile guide channel B in a ring shape. Based on this arrangement, on the one hand, the internal space of the middle two-way communication section 15 is fully utilized, and the water inlet cross-sectional area and the water outlet cross-sectional area are as large as possible in the limited design space, so as to meet the theoretical design requirement of water inlet and outlet capacity (6-10 m 3 / h). On the other hand, this channel pattern based on central symmetry helps to keep the center of gravity of the shell assembly centered and stable during water lifting operation, and avoids lateral (radial) tilting of the shell assembly during water lifting operation or static state.

[0106] Preferably, among the water outlet and oil path section 11, the double-wall oil cylinder section 12, the upper two-way communication section 13, the repeated unit section, the lower double-wall water cylinder section 16, and the lower two-way communication section 17 included in the shell assembly, any two adjacent sections are connected by a threaded sleeve 5. The middle double-wall water cylinder section 14 and the middle two-way communication section 15 included in the repeated unit section are also connected by a threaded sleeve 5. The threaded sleeve 5 includes a semi-annular part A51, a semi-annular part B52, and a locking screw 53. The outer walls of the semi-annular part A51 and the semi-annular part B52 are respectively provided with a half external thread. The semi-annular part A51 and the semi-annular part B52 are respectively provided with a wrench positioning hole 400. The semi-annular part A51 and the semi-annular part B52 form a sleeve pipe by embracing each other, so that the half external thread on the semi-annular part A51 and the half external thread on the semi-annular part B52 form a complete external thread, and the semi-annular part A51 and the semi-annular part B52 are connected as a whole by the locking screw 53. The structure of the above-mentioned threaded sleeve 5 facilitates the threaded connection between two long pipe fittings. During assembly, the threaded sleeve 5 is installed on the outer circular surface of one of the long pipe fittings, and then the internal thread in the inner hole of the other long pipe fitting is connected to the external thread of the threaded sleeve 5. Then, by rotating the threaded sleeve 5 under the assistance of a wrench (without rotating the long pipe fitting which has relatively large weight), the threaded connection between the two long pipe fittings can be achieved, greatly reducing the assembly difficulty.

[0107] Preferably, the shell assembly is provided with a pressure relief valve 500 on the outer wall of the lower two-way communication section 17, which communicates to the annular water cavity C162. The pressure relief pressure of the pressure relief valve 500 is 4-5 MPa. The hydraulic type uranium mine leaching solution multi-stage piston liquid lifting system also includes a high-pressure air charging device (not shown in the figure), which is provided with a water pipe quick connector D for outputting high-pressure air. The high-pressure air charging device is connected or separated to the water pipe quick connector B of the cable-pipe composite through the water pipe quick connector D. The highest charging pressure that the high-pressure air charging device can provide is not less than 5 MPa.

[0108] Preferably, among the drainage and oil passage section 11, the double-wall oil cylinder section 12, the upper two-way communication section 13, the repeated unit section, the lower double-wall water cylinder section 16 and the lower two-way communication section 17 comprised by the shell assembly, any two adjacent sections are connected by the threaded connection of the screwing sleeve 8. The middle double-wall water cylinder section 14 and the middle two-way communication section 15 comprised by the repeated unit section are also connected by the threaded connection of the screwing sleeve 8. The screwing sleeve 8 comprises a semi-annular part A81, a semi-annular part B82 and a locking screw 83, the outer wall of the semi-annular part A81 and the semi-annular part B82 is respectively provided with a half external thread, the semi-annular part A81 and the semi-annular part B82 are respectively provided with a wrench positioning hole 400, the semi-annular part A81 and the semi-annular part B82 form a sleeve pipe by surrounding and embracing, the half external thread on the semi-annular part A81 and the half external thread on the semi-annular part B82 are combined to form a complete external thread, and the semi-annular part A81 and the semi-annular part B82 are connected as a whole by the locking screw 83. The structure of the above-mentioned screwing sleeve 8 is convenient for the threaded connection between two long pipe fittings. During assembly, the screwing sleeve 8 is installed on the outer circular surface of one of the long pipe fittings, the internal thread in the inner hole of the other long pipe fitting is butted with the external thread of the screwing sleeve 8, and then the threaded connection between the two long pipe fittings can be realized by rotating the screwing sleeve 8 (without rotating the long pipe fitting with relatively large weight) under the assistance of a wrench, which greatly reduces the assembly difficulty.

[0109] The present application is used for extracting the leaching solution in in-situ leaching uranium mine, and the steps are as follows:

[0110] S01, connecting and lowering the liquid extracting mechanism:

[0111] a, connecting the water pipe quick connector B of the cable-pipe composite to the water pipe quick connector A714 of the composite connector of the winch 71, connecting the steel cable quick connector B of the cable-pipe composite to the steel cable quick connector A712 of the composite connector of the winch 71, connecting the oil pipe quick connector B of the cable-pipe composite to the oil pipe quick connector A713 of the composite connector of the winch 71, and fixing and sealing the lower ends of the two oil pipes 55 of the cable-pipe composite to the oil inlet and oil outlet of the liquid extracting mechanism respectively;

[0112] b, driving the drum 711 of the winch 71 to rotate, winding the cable-pipe composite on the drum 711, and making the liquid extracting mechanism in a suspended state, at this time, the winch 71 connects and bears the liquid extracting mechanism through the steel cable 54 and the pipe end fixing device 52 in sequence;

[0113] c, driving the winch 71 to move, making the liquid extracting mechanism above the wellhead of the in-situ leaching uranium mine, and driving the drum 711 of the winch 71 to rotate, lowering the liquid extracting mechanism to the preset depth in the well, at this time, the composite connector of the winch 71 is above the wellhead of the in-situ leaching uranium mine.

[0114] S02, Pipe connection and steel cable fixing:

[0115] a. Disconnect the connection between the quick-connect oil pipe B of the cable conduit composite and the quick-connect oil pipe A713 of the composite joint, and then connect the quick-connect oil pipe B to the quick-connect oil pipe C of the hydraulic station 74. After connection, the oil circuit is connected, and the two oil pipes 55 are used for oil inlet and oil outlet respectively.

[0116] b. Disconnect the connection between the quick water pipe connector B of the cable conduit composite and the quick water pipe connector A714 of the composite connector, and then connect the quick water pipe connector B to the quick water pipe connector C of the water pump 72. After connection, the water circuit is connected.

[0117] c. Disconnect the connection between the quick-connect cable B of the cable conduit composite and the quick-connect cable A712 of the composite connector. After disconnection, the water pipe 53 and the two oil pipes 55 are temporarily used to connect and support the liquid lifting mechanism. Fix the two cable bodies of the steel cable 54 through the two U-shaped clips 62 of the steel cable fixing frame. After fixing, the two cable bodies of the steel cable 54 are respectively clamped in the two clamping areas of the steel cable fixing frame. The steel cable fixing frame is connected to and supports the liquid lifting mechanism through the steel cable 54 and the pipe end fixing device 52 in sequence.

[0118] S03, Extraction of leachate from in-situ uranium ore mines:

[0119] On the one hand, the hydraulic station 74 is started, and the piston rod of the oil cylinder 21 is driven by hydraulic power to move in and out to continuously extract leachate; on the other hand, the water pump 72 is started so that the leachate extracted outside the wellhead can flow to the storage tank 73.

[0120] When the piston rod of cylinder 2 extends, the following effects are simultaneously produced:

[0121] 1. The piston A3 moves downward, which expands the volume of the middle front chamber 1411 and generates negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel A131 through the water inlet A100, and then enters the middle front chamber 1411 through the first one-way valve 133 to achieve liquid suction.

[0122] 2. The piston B4 moves downward, which expands the volume of the lower front chamber 1611 and generates negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel B151 through the water inlet B200, and then enters the lower front chamber 1611 through the fourth one-way valve 154 to achieve liquid suction.

[0123] 3、Piston A3 moves down, the volume of the middle rear chamber 1412 is reduced to generate positive pressure, under the action of positive pressure, the liquid in the middle rear chamber 1412 passes through the third water inlet branch 1521 with the fifth one-way valve 155, the drainage channel B 152, the merging channel section 1522, the annular water chamber B 142, the first water inlet branch 1321, the drainage channel A 132 and the annular water chamber A 122 in turn, enters the water outlet channel 112, is transported to the wellhead outside through the water pipe 53, and finally flows into the liquid pool 73 through the suction force of the water pump 72;

[0124] 4、Piston B4 moves down, the volume of the lower rear chamber 1612 is reduced to generate positive pressure, under the action of positive pressure, the liquid in the lower rear chamber 1612 passes through the drainage channel C 172 with the eighth one-way valve 174, the annular water chamber C 162, the fifth water inlet branch 1524, the drainage channel B 152, the merging channel section 1522, the annular water chamber B 142, the first water inlet branch 1321, the drainage channel A 132 and the annular water chamber A 122 in turn, enters the water outlet channel 112, is transported to the wellhead outside through the water pipe 53, and finally flows into the liquid pool 73 through the suction force of the water pump 72.

[0125] When the piston rod of the oil cylinder 2 is retracted, the following effects are simultaneously generated:

[0126] 1、Piston A3 moves up, the volume of the middle rear chamber 1412 is expanded to generate negative pressure, under the action of negative pressure, the leaching liquid in the well enters the water inlet channel B 151 through the water inlet B 200, and then enters the middle rear chamber 1412 through the third one-way valve 153, thereby realizing liquid absorption;

[0127] 2、Piston B4 moves up, the volume of the lower rear chamber 1612 is expanded to generate negative pressure, under the action of negative pressure, the leaching liquid in the well enters the water inlet channel C 171 through the water inlet C 300, and then enters the lower rear chamber 1612 through the seventh one-way valve 173, thereby realizing liquid absorption;

[0128] 3、Piston A3 moves up, the volume of the middle front chamber 1411 is reduced to generate positive pressure, under the action of positive pressure, the liquid in the middle front chamber 1411 passes through the second water inlet branch 1322 with the second one-way valve 134, the drainage channel A 132 and the annular water chamber A 122 in turn, enters the water outlet channel 112, is transported to the wellhead outside through the water pipe 53, and finally flows into the liquid pool 73 through the suction force of the water pump 72;

[0129] 4. The piston B4 moves upward, the volume of the lower front chamber 1611 is reduced to produce positive pressure, under the action of positive pressure, the liquid in the lower front chamber 1611 in turn through the fourth water inlet branch 1523 with the sixth one-way valve 156, drainage channel B152, convergence channel section 1522, annular water cavity B142, the first water inlet branch 1321, drainage channel A132 and annular water cavity A122, into the water collection channel 112, and then through the water pipe 53 to the wellhead outside, finally through the suction force of the water pump 72 into the liquid pool 73.

[0130] S04, lift and remove the liquid lifting mechanism:

[0131] a, first drive the winch 71 to move, so that the composite joint on the winch 71 is located directly above the wellhead of the in-situ leaching uranium mine, then connect the steel cable quick connector B of the cable-pipe composite to the steel cable quick connector A712 of the composite joint, then remove the two U-shaped clamps 62 from the bottom frame 61 of the steel cable fixing frame, so that the steel cable 54 is disconnected from the steel cable fixing frame. At this time, the winch 71 is connected to and bears the liquid lifting mechanism through the steel cable 54 and the pipe end fixing device 52 in turn;

[0132] b, disconnect the connection between the water pipe quick connector B of the cable-pipe composite and the water pipe quick connector C of the water pump 72, connect the water pipe quick connector B to the water pipe quick connector D of the high-pressure inflation device, inflate high-pressure air into the water pipe 53 through the high-pressure inflation device, so that the water in the water pipe 53 flows downward and enters the annular water cavity C162 through the water collection channel 112, annular water cavity A122, drainage channel A132, annular water cavity B142 and drainage channel B152 in turn, and then is discharged into the in-situ leaching uranium mine after the pressure relief valve 500 is opened. At this time, the residual leaching liquid in the water pipe 53 is replaced by high-pressure air;

[0133] c, stop the air supply of the high-pressure inflation device, disconnect the connection between the water pipe quick connector B of the cable-pipe composite and the water pipe quick connector D of the high-pressure inflation device, and connect the water pipe quick connector B to the water pipe quick connector A714 of the composite joint of the winch 71; disconnect the connection between the oil pipe quick connector B of the cable-pipe composite and the oil pipe quick connector C of the hydraulic station 74, and connect the oil pipe quick connector B to the oil pipe quick connector A713 of the composite joint of the winch 71;

[0134] d, drive the winding drum 711 of the winch 71 to operate, on the one hand, the cable-pipe composite is wound on the winding drum 711, on the other hand, the liquid lifting mechanism is lifted to above the wellhead of the in-situ leaching uranium mine; finally, disconnect the connection between the lower ends of the two oil pipes 55 and the oil inlet and outlet of the liquid lifting mechanism, and remove the steel cable fixing device 51 and the pipe end fixing device 52 from the water outlet of the liquid lifting mechanism, so as to separate the liquid lifting mechanism from the cable-pipe composite.

[0135] In this step, the pressure of the high-pressure air is not less than 5 MPa, and the pressure relief pressure of the pressure relief valve 500 is 4-5 MPa.

Claims

1. A multi-stage piston extraction method for leachate from hydraulic in-situ uranium ore mines, applied to a multi-stage piston extraction system for leachate from hydraulic in-situ uranium ore mines, used to extract leachate from in-situ uranium ore mines; Its characteristics are: The hydraulic in-situ uranium ore leaching fluid multi-stage piston lifting system includes a lifting mechanism, a cable pipe composite, a steel cable fixing frame, a winch, a water pump, a storage tank, and a hydraulic station. The liquid lifting mechanism includes a housing assembly, a hydraulic cylinder, push-pull rod A, push-pull rod B, a connector, piston A, and piston B. The housing assembly, from one end to the other, sequentially comprises a drainage / oil passage section, a double-walled hydraulic cylinder section, an upper bidirectional connecting section, a repeating unit section, a lower double-walled water cylinder section, and a lower bidirectional connecting section. The drainage / oil passage section contains independent oil passages and a combined water outlet channel. The oil passages have oil inlets and outlets at the ends of the housing assembly, and the combined water outlet channel has a water outlet at the ends of the housing assembly. The outlet has external threads on its outer wall; the double-walled cylinder section has an internally separate cylinder mounting cavity and an annular water cavity A; the upper bidirectional connecting section has an internally separate inlet channel A, a drainage channel A, and a moving guide channel A; the repeating unit section includes an interconnected middle double-walled cylinder section and a middle bidirectional connecting section; the middle double-walled cylinder section has an internally separate middle piston cavity and an annular water cavity B; the middle bidirectional connecting section has an internally separate inlet channel B, a drainage channel B, and a moving guide channel B; the lower section... The double-walled water cylinder section has an internally separate lower piston chamber and an annular water chamber C; the internally separate lower bidirectional connecting section has an internally separate inlet channel C and a drainage channel C; the cylinder body is fixedly installed at the front end of the cylinder mounting cavity, and the piston rod of the cylinder extends to the rear end of the cylinder mounting cavity; the internal part of the cylinder body is connected to the rear end of the oil passage; push-pull rod A is sealed and slidably installed in the moving guide channel A, with its front and rear ends extending into the cylinder mounting cavity and the middle piston cavity, respectively; push-pull rod B is sealed and slidably installed in the moving guide channel B, with its front and rear ends extending into the middle piston cavity and the lower piston cavity, respectively; a connector is set between the front end of push-pull rod A and the piston rod of the cylinder, which fixes the front end of push-pull rod A and the piston rod of the cylinder into one unit, realizing synchronous movement of the cylinder and push-pull rod A; piston A is sealed and slidably installed in the middle piston cavity, and its two ends are connected to the rear end of push-pull rod A and the front end of push-pull rod B, respectively; piston B is sealed and slidably installed in the lower piston cavity, and its rear end is connected to push-pull rod B; The cable-pipe composite includes a steel cable fixing device, a pipe end fixing device, a water pipe, a steel cable, an oil pipe, and an anti-winding device. The steel cable fixing device has a clearance hole in the middle for the outlet of the liquid extraction mechanism to pass through. The outer side of the steel cable fixing device has two steel cable through-holes evenly distributed around the clearance hole and two oil pipe limiting notches A. The pipe end fixing device includes an inner sleeve and an outer sleeve, which are threaded together at the lower end. The inner sleeve is located inside the outer sleeve, and the inner sleeve has an internal thread in its lower inner hole. The inner sleeve and outer sleeve together form a clamping mechanism at the upper end. The lower end of the water pipe is clamped by a conical ring; the lower end of the water pipe is fixedly connected to the conical ring clamping area of ​​the pipe end fixing device, and the upper end of the water pipe is equipped with a quick connector B; the steel cable is bent into a U-shape, and both ends of the steel cable pass through the cable holes of the steel cable fixing device and extend out of the upper end of the steel cable fixing device. The two cable bodies are arranged parallel to the water pipe and are symmetrically distributed on the outside of the water pipe. Each end of the steel cable is equipped with a quick connector B; two oil pipes, one for oil inlet and one for oil outlet, are symmetrically distributed on the outside of the water pipe. The pipes are arranged parallel to the water pipes. The lower ends of the two oil pipes pass through two oil pipe limiting notches A of the steel cable fixing device, and the upper ends of the two oil pipes are respectively equipped with oil pipe quick connectors B. Multiple anti-winding devices are spaced apart along the length of the cable-pipe composite. The anti-winding device has a water pipe through-hole in the middle, through which the water supply pipe passes. The anti-winding device also has two steel cable limiting notches and two oil pipe limiting notches B that connect to the water pipe through-hole. The anti-winding device forms an interference fit with the two cable bodies of the steel cable through the two steel cable limiting notches. The anti-winding device allows two oil pipes to pass through two oil pipe limiting notches B; the cable-pipe composite is a flexible linear body, and the anti-winding device is a rigid node on the flexible linear body. The cable-pipe composite limits the relative positions of the water pipe, steel cable, and oil pipe through the anti-winding device; the two oil pipes of the cable-pipe composite are fixedly connected to the oil inlet and oil outlet of the liquid lifting mechanism at their lower ends, respectively; the steel cable fixing device of the cable-pipe composite surrounds the water outlet of the liquid lifting mechanism through the clearance hole, and the lower end face of the steel cable fixing device abuts against the pipe end fixing device. The winch is equipped with a drum on which a cable is wound. The lower end of the cable is equipped with a composite joint, which includes two quick-connect steel cable joints A, two quick-connect oil pipe joints A, and one quick-connect water pipe joint A. The quick-connect steel cable joints A are used to connect or disconnect with the quick-connect steel cable joints B in the cable-conduit composite. The quick-connect oil pipe joints A are used to connect or disconnect with the quick-connect oil pipe joints B in the cable-conduit composite. The quick-connect water pipe joint A is used to connect or disconnect with the quick-connect water pipe joint B in the cable-conduit composite. The winch is installed on the ground outside the leaching uranium mine. The cable fixing frame includes a base frame, U-shaped clamps, and nuts. The base frame includes two parallel channel steels and a connecting rod fixedly connected between the two channel steels. The area between the two channel steels is defined as the inner side of the base frame, and the area outside the two channel steels is defined as the outer side of the base frame. One end of the U-shaped clamp is closed, and the other end is open. The two rod ends of the open end of the U-shaped clamp are provided with external threads. The two rod ends of the U-shaped clamp pass through the two side walls of one channel steel of the base frame and are then locked to the channel steel of the base frame by nuts threaded to the rod ends. The closed end of the U-shaped clamp is located inside the base frame, and the open end of the U-shaped clamp is located outside the base frame. A clamping area is formed between the closed end of the U-shaped clamp and the channel steel of the base frame. The two U-shaped clamps clamp and fix the two sections of the cable body through the clamping area respectively. The base frame of the cable fixing frame is fixed or placed directly above the wellhead of the leaching uranium mine. The water pump is fixedly installed on the ground outside the leaching uranium mine, and has an inlet port and a outlet port. The inlet port is connected to a quick-connect pipe C, and the outlet port of the water pump is connected to the storage tank through a pipe. The quick-connect pipe C of the water pump is used to connect or disconnect with the quick-connect pipe B in the cable conduit complex. The hydraulic station is installed on the ground outside the leaching uranium mine, and has two quick-connect oil pipes C. The hydraulic station connects or disconnects with the quick-connect oil pipes B in the cable conduit complex through the two quick-connect oil pipes C. S01, Connect and lower the liquid extraction mechanism: a. Connect the water pipe quick connector B of the cable conduit composite to the water pipe quick connector A of the winch's composite connector; connect the steel cable quick connector B of the cable conduit composite to the steel cable quick connector A of the winch's composite connector; connect the oil pipe quick connector B of the cable conduit composite to the oil pipe quick connector A of the winch's composite connector; fix and seal the lower ends of the two oil pipes of the cable conduit composite to the oil inlet and oil outlet of the liquid lifting mechanism, respectively. b. Drive the winch drum to rotate, and wind the cable-pipe composite onto the drum, so that the liquid lifting mechanism is in a suspended state. At this time, the winch is connected to and supports the liquid lifting mechanism in sequence through the steel cable and the pipe end fixing device. c. Drive the winch to move so that the liquid lifting mechanism is directly above the wellhead of the leaching uranium mine. Drive the winch drum to rotate and lower the liquid lifting mechanism to the preset depth in the well. At this time, the winch's composite joint is directly above the wellhead of the leaching uranium mine. S02, Pipe connection and steel cable fixing: a. Disconnect the quick-connect oil pipe B of the cable conduit composite with the quick-connect oil pipe A of the composite joint, and then connect the quick-connect oil pipe B to the quick-connect oil pipe C of the hydraulic station. After connection, the oil circuit is connected, and the two oil pipes are used for oil inlet and oil outlet respectively. b. Disconnect the quick-connect water pipe B of the cable conduit composite with the quick-connect water pipe A of the composite connector, and then connect the quick-connect water pipe B to the quick-connect water pipe C of the water pump. After connection, the water circuit is connected. c. Disconnect the connection between the quick-connect steel cable B of the cable conduit composite and the quick-connect steel cable A of the composite connector. After disconnection, the water pipe and the two oil pipes are temporarily used to connect and support the liquid lifting mechanism. Fix the two cable bodies of the steel cable through the two U-shaped clips of the steel cable fixing frame. After fixing, the two cable bodies of the steel cable are respectively clamped in the two clamping areas of the steel cable fixing frame. The steel cable fixing frame is connected to and supports the liquid lifting mechanism in sequence through the steel cable and the pipe end fixing device. S03, Extraction of leachate from in-situ uranium ore mines: On the one hand, the hydraulic station is started, and the piston rod of the oil cylinder is driven by hydraulic power to move back and forth to achieve continuous extraction of leachate; on the other hand, the water pump is started so that the leachate extracted outside the wellhead can flow to the storage tank. When the piston rod of the hydraulic cylinder extends, the following effects occur simultaneously: Ⅰ. Piston A moves downward, causing the volume of the central front chamber to expand and generate negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel A through the water inlet A, and then enters the central front chamber through the first one-way valve to achieve liquid suction. II. The piston B moves downward, which expands the volume of the lower front chamber and generates negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel B through the water inlet B, and then enters the lower front chamber through the fourth one-way valve to achieve liquid suction. Ⅲ. Piston A moves downward, reducing the volume of the middle rear chamber and generating positive pressure. Under the action of positive pressure, the liquid in the middle rear chamber passes through the third water inlet branch with the fifth one-way valve, the drainage channel B, the confluence channel section, the annular water chamber B, the first water inlet branch, the drainage channel A, and the annular water chamber A in sequence, and enters the collection outlet channel. Then it is transported to the outside of the wellhead through the water pipe, and finally flows into the storage tank by the suction force of the water pump. IV. Piston B moves downward, reducing the volume of the lower rear chamber and generating positive pressure. Under the action of positive pressure, the liquid in the lower rear chamber passes through the drainage channel C with the eighth one-way valve, the annular water chamber C, the fifth water inlet branch, the drainage channel B, the confluence channel section, the annular water chamber B, the first water inlet branch, the drainage channel A, and the annular water chamber A in sequence, and enters the collection outlet channel. It is then transported to the outside of the wellhead through the water pipe, and finally flows into the storage tank by the suction force of the water pump. When the piston rod of the hydraulic cylinder retracts, the following effects occur simultaneously: Ⅰ. Piston A moves upward, which expands the volume of the middle rear chamber and generates negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel B through the water inlet B, and then enters the middle rear chamber through the third one-way valve to achieve liquid suction. II. The piston B moves upward, which expands the volume of the lower rear chamber and generates negative pressure. Under the action of negative pressure, the leachate in the well enters the water inlet channel C through the water inlet C, and then enters the lower rear chamber through the seventh one-way valve to achieve liquid suction. III. Piston A moves upward, reducing the volume of the central front chamber and generating positive pressure. Under the action of positive pressure, the liquid in the central front chamber passes through the second water inlet branch with the second one-way valve, the drainage channel A and the annular water chamber A in sequence, enters the main outlet channel, and is then transported to the outside of the wellhead through the water pipe. Finally, it flows into the storage tank through the suction force of the water pump. IV. As piston B moves upward, the volume of the lower front chamber decreases, generating positive pressure. Under the action of positive pressure, the liquid in the lower front chamber passes sequentially through the fourth water inlet branch with the sixth check valve, the drainage channel B, the confluence channel section, the annular water chamber B, the first water inlet branch, the drainage channel A, and the annular water chamber A, and enters the main outlet channel. It is then transported to the outside of the wellhead through the water pipe, and finally flows into the storage tank by the suction force of the water pump.

2. The multi-stage piston extraction method for leaching fluid in hydraulic in-situ uranium mines as described in claim 1, characterized in that: The housing assembly is cylindrical. In the drainage and oil passage section, the front ends of both the oil passage and the combined water outlet passage are connected to the end face of the housing assembly. In the double-walled cylinder section, an annular water cavity A is arranged around the outside of the cylinder mounting cavity. The front end of the annular water cavity A is connected to the rear end of the combined water outlet passage, and the front end of the cylinder mounting cavity is connected to the rear end of the oil passage passage. In the upper bidirectional connecting section, the inlet channel A, the drain channel A, and the moving guide channel A are not connected to each other. The front end of the inlet channel A is connected to the outer circular surface of the housing assembly to form an inlet A, and a first check valve is provided in the inlet channel A. The front end of the drain channel A is connected to the rear end of the annular water cavity A. The rear end is provided with a first water inlet branch and a second water inlet branch, and the second water inlet branch is provided with a second one-way valve; the front end of the moving guide channel A is connected to the rear end of the cylinder mounting cavity; in the middle double-walled cylinder section, the annular water cavity B is arranged around the outside of the middle piston cavity, the front end of the annular water cavity B is connected to the first water inlet branch of the drain channel A, and the front end of the middle piston cavity is connected to the second water inlet branch of the drain channel A, the rear end of the water inlet channel A and the rear end of the moving guide channel A respectively; in the middle bidirectional connecting section, the water inlet channel B, the drain channel B and the moving guide channel B are not connected to each other; the middle of the water inlet channel B is provided with an inlet valve connected to the outer circumference of the housing assembly. Water inlet B and water inlet channel B are respectively equipped with a third check valve and a fourth check valve at both ends. The end of water inlet channel B with the third check valve is connected to the rear end of the middle piston chamber. The front end of drainage channel B is equipped with a third water inlet branch and a confluence channel section. The third water inlet branch is equipped with a fifth check valve and is connected to the rear end of the middle piston chamber. The confluence channel section of drainage channel B is connected to the rear end of the annular water chamber B. The rear end of drainage channel B is equipped with a fourth water inlet branch and a fifth water inlet branch. The fourth water inlet branch is equipped with a sixth check valve. The front end of the moving guide channel B is connected to the rear end of the middle piston chamber. In the lower double-walled water cylinder section, the annular water chamber C surrounds... Located outside the lower piston chamber, the front end of the annular water chamber C is connected to the fifth water inlet branch of the drainage channel B. The front end of the lower piston chamber is connected to the end of the water inlet channel B equipped with the fourth one-way valve, the fourth water inlet branch of the drainage channel B, and the rear end of the moving guide channel B. In the lower bidirectional connecting section, the water inlet channel C is equipped with a seventh one-way valve. The front end of the water inlet channel C is connected to the outer circular surface of the housing assembly to form a water inlet C, and the rear end of the water inlet channel C is connected to the rear end of the lower piston chamber. The drainage channel C is equipped with an eighth one-way valve. The front end of the drainage channel C is connected to the rear end of the lower piston chamber, and the rear end of the drainage channel C is connected to the rear end of the annular water chamber C.

3. The multi-stage piston extraction method for leaching fluid in hydraulic uranium mines as described in claim 2, characterized in that: The housing assembly has a pressure relief valve on the outer wall of the lower bidirectional connecting section, which connects to the annular water chamber C. The pressure relief valve has a pressure of 4-5 MPa. The hydraulic in-situ uranium ore leaching fluid multi-stage piston lifting system also includes a high-pressure air charging device. The high-pressure air charging device is equipped with a water pipe quick connector D for outputting high-pressure air. The high-pressure air charging device is connected or disconnected from the water pipe quick connector B of the cable conduit composite through the water pipe quick connector D. The maximum air charging pressure that the high-pressure air charging device can provide is not less than 5 MPa. The method also includes step S04, which follows step S03. S04, Lift and disassemble the liquid extraction mechanism: a. First, drive the winch to move so that the composite joint on the winch is directly above the wellhead of the leaching uranium mine. Then, connect the quick connector B of the cable-pipe composite to the quick connector A of the composite joint. Then, remove the two U-shaped clips from the base of the cable fixing frame to disconnect the cable from the cable fixing frame. At this time, the winch connects to the lifting mechanism in sequence through the cable and the pipe end fixing device. b. Disconnect the quick connector B of the cable conduit complex from the quick connector C of the water pipe of the water pump. Connect the quick connector B of the water pipe to the quick connector D of the high-pressure air charging device. Inflate the water pipe with high-pressure air through the high-pressure air charging device, so that the water in the water pipe flows downward and enters the annular water chamber C in sequence through the main outlet channel, the annular water chamber A, the drainage channel A, the annular water chamber B and the drainage channel B. After the pressure relief valve is opened, the water is discharged into the in-situ leaching uranium mine. At this time, the leachate remaining in the water pipe is replaced by high-pressure air. c. Stop the air supply of the high-pressure air charging device, disconnect the connection between the water pipe quick connector B of the cable conduit composite and the water pipe quick connector D of the high-pressure air charging device, and connect the water pipe quick connector B to the water pipe quick connector A of the winch composite joint; disconnect the connection between the oil pipe quick connector B of the cable conduit composite and the oil pipe quick connector C of the hydraulic station, and connect the oil pipe quick connector B to the oil pipe quick connector A of the winch composite joint. d. Drive the winch drum to rotate, on the one hand winding the cable-pipe composite onto the drum, and on the other hand lifting the liquid lifting mechanism to the top of the wellhead of the leaching uranium mine; finally, disconnect the connection between the lower ends of the two oil pipes and the oil inlet and outlet of the liquid lifting mechanism, and remove the steel cable fixing device and pipe end fixing device from the water outlet of the liquid lifting mechanism, thereby separating the liquid lifting mechanism from the cable-pipe composite. In this step, the pressure of the high-pressure air is not less than 5MPa, and the pressure relief valve has a relief pressure of 4-5MPa.

4. The multi-stage piston extraction method for leaching fluid in hydraulic uranium mines as described in claim 3, characterized in that: Piston A divides the central piston chamber into a central front chamber relatively close to the front end of the central piston chamber and a central rear chamber relatively close to the rear end of the central piston chamber. Piston A includes a rotating body A, a rotating body B, a spherical bearing A, and a first anti-wear ring. The rotating body A is a sleeve-shaped structure with open ends. Its outer surface has a first sealing section, a first annular boss, a first external thread section, and a second sealing section sequentially from the front end to the rear end. Its inner bore has a first mounting section, a first shaft end positioning section, a sealing plate connecting section, and a second shaft end positioning section sequentially from the front end to the rear end. The rotating body A has a sealing plate welded at the sealing plate section of its inner bore, which divides the inner bore of the rotating body A into two non-communicating blind holes. The rotating body B is a sleeve-shaped structure with open ends. Its outer surface has a second mounting section, a second annular boss, and a third sealing section sequentially from the front end to the rear end. Its inner bore has a first internal thread section, a fourth sealing section, and a third mounting section sequentially from the front end to the rear end. The rotating body A connects to the first external thread section via the first external thread section. The first internal thread section of the rotating body B is threadedly connected. The second sealing section on the outer circumference of the rotating body A and the fourth sealing section in the inner hole of the rotating body B are directly opposite each other and sealed by an O-ring seal between them. Two spherical bearings A are respectively movably installed in the first mounting section of the rotating body A and the third mounting section of the rotating body B, and are axially positioned at both ends. The first anti-wear ring is installed on the second mounting section of the rotating body B, and its two ends abut against the first annular boss of the rotating body A and the second annular boss of the rotating body B, respectively, and are axially positioned. The piston A is slidably installed in the middle piston cavity through the first anti-wear ring, with the rotating body A facing the front of the middle piston cavity and the rotating body B facing the rear of the middle piston cavity. The piston A achieves sealing between the piston A and the middle piston cavity through a Y-ring seal installed on the first sealing section on the outer circumference of the rotating body A and a Y-ring seal installed on the third sealing section on the outer circumference of the rotating body B. Correspondingly, the rear end of the push-pull rod A passes through the spherical bearing A in the inner hole of the rotating body A and extends into the first shaft end positioning section in the inner hole of the rotating body A, and then provides axial positioning for the push-pull rod A through the washer and nut installed at the rear end of the push-pull rod A; Correspondingly, the front end of the push-pull rod B passes through the spherical bearing A in the inner hole of the rotating body B and extends into the second shaft end positioning section in the inner hole of the rotating body A. The push-pull rod B is then axially positioned by the washer and nut installed at the front end of the push-pull rod B.

5. The multi-stage piston extraction method for leaching fluid in hydraulic uranium mines as described in claim 4, characterized in that: Piston B divides the lower piston chamber into a lower front chamber relatively close to the front end of the lower piston chamber and a lower rear chamber relatively close to the rear end of the lower piston chamber. Piston B includes a rotating body C, a rotating body D, a spherical bearing B, and a second anti-wear ring. The rotating body C is a sleeve-shaped structure with open ends. Its outer surface has a fifth sealing section, a third annular boss, a second external thread section, and a sixth sealing section sequentially from the front end to the rear end. Its inner bore has a fourth mounting section and a third shaft end positioning section sequentially from the front end to the rear end. The rotating body D is a sleeve-shaped structure with one open end and the other closed end. Its outer surface has a fifth mounting section, a fourth annular boss, and a seventh sealing section sequentially from the front end to the rear end. Its inner bore has a second internal thread section and an eighth sealing section sequentially from the front end to the rear end. The rotating body C is threadedly connected to the second internal thread section of the rotating body D through the second external thread section. The sixth sealing section on the outer circular surface and the eighth sealing section in the inner hole of the rotating body D are directly opposite each other and sealed by an O-ring seal between them; the spherical bearing B is movably installed in the fourth mounting section of the rotating body C and is axially positioned at both ends; the second anti-wear ring is installed on the fifth mounting section of the rotating body D, and its two ends abut against the third annular boss of the rotating body C and the fourth annular boss of the rotating body D, respectively, and are axially positioned; the piston B is slidably installed in the lower piston cavity through the second anti-wear ring, with the rotating body C facing the lower front cavity of the lower piston cavity and the rotating body D facing the lower rear cavity of the lower piston cavity; the piston B achieves sealing between the piston B and the lower piston cavity through the Y-ring seal installed on the fifth sealing section on the outer circular surface of the rotating body C and the Y-ring seal installed on the seventh sealing section on the outer circular surface of the rotating body D; Correspondingly, the rear end of the push-pull rod B passes through the spherical bearing B in the inner hole of the rotating body C and extends into the third shaft end positioning section in the inner hole of the rotating body C. The push-pull rod B is then axially positioned by the washer and nut installed at the rear end of the push-pull rod B.

6. The multi-stage piston extraction method for leaching fluid in hydraulic in-situ uranium mines as described in claim 5, characterized in that: In the upper bidirectional connecting section, the movable guide channel A is centrally located. The number of water inlet channels A and drainage channels A is the same, with four channels each. All water inlet channels A and all drainage channels A are evenly distributed in a ring around the movable guide channel A.

7. The multi-stage piston extraction method for leaching fluid in hydraulic in-situ uranium mines as described in claim 6, characterized in that: In the central bidirectional connecting section, the movable guide channel B is centrally located. The number of water inlet channels B and drainage channels B is the same, with four channels each. All water inlet channels B and all drainage channels B are evenly distributed in a ring around the movable guide channel B.

8. The multi-stage piston extraction method for leaching fluid in hydraulic in-situ uranium mines as described in claim 7, characterized in that: In the housing assembly, any two adjacent sections, including the drainage and oil passage section, the double-walled hydraulic cylinder section, the upper bidirectional connecting section, the repeating unit section, the lower double-walled water cylinder section, and the lower bidirectional connecting section, are connected by a tightening sleeve thread. The middle double-walled water cylinder section and the middle bidirectional connecting section, which are included in the repeating unit section, are also connected by a tightening sleeve thread. The tightening sleeve includes a semi-annular split A, a semi-annular split B, and a locking screw. The outer walls of the semi-annular split A and the semi-annular split B are each provided with half of the external thread. The semi-annular split A and the semi-annular split B are each provided with a wrench positioning hole. The semi-annular split A and the semi-annular split B encircle each other to form a sleeve, so that the half of the external thread on the semi-annular split A and the half of the external thread on the semi-annular split B are combined to form a complete external thread. The semi-annular split A and the semi-annular split B are then connected into a whole by the locking screw.

9. The multi-stage piston extraction method for leaching fluid in hydraulic in-situ uranium mines as described in claim 8, characterized in that: The number of repeating unit segments is 1.

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