CN106525693B - A hydraulic seepage pressure loading device for rock seepage test - Google Patents

Abstract

The invention relates to the field of rock penetration test equipment, in particular to a hydraulic type penetration pressure loading device for rock penetration test, which comprises a water tank, a first oil tank, a unidirectional variable pump, a speed regulating valve, a three-position four-way hydraulic reversing valve, a double-acting booster cylinder and a penetrometer which are sequentially communicated, wherein the unidirectional variable pump is communicated with a safety protection device. The two oil cavities of the double-acting booster cylinder are respectively communicated with the three-position four-way hydraulic reversing valve through two oil pipes, the two water cavities are respectively communicated with the water tank in one way, the two water cavities are respectively communicated with the permeameter through two water supply pipes, and a first control oil way provided with a first sequence valve and a second control oil way provided with a second sequence valve for controlling the switching of the three-position four-way hydraulic reversing valve are further arranged between the double-acting booster cylinder and the three-position four-way hydraulic reversing valve. The automatic control of osmotic pressure in the test process is realized, so that the intermediate water supply is not interrupted, and the test cost is saved.

Description

A hydraulic seepage pressure loading device for rock seepage test

technical field

The invention relates to the field of rock penetration test equipment, in particular to a hydraulic penetration pressure loading device for rock penetration tests.

Background technique

In the process of coal mining, if the hidden collapse column is exposed, water inrush disasters often occur. The fissures and void structures of the broken rock in the collapsed column formed channels for water inrush. The seepage test of broken rock is the basis for studying the seepage catastrophe mechanism of broken rock accompanied by particle migration. At present, the technical problem of the broken rock penetration test is the loading and control of the penetration pressure.

The existing seepage pressure loading device for rock seepage test is controlled by water pump station, oil pump station and injector type energy storage device. On the one hand, manual switching is required between the water pumping station, oil pumping station, and energy storage device, which increases the workload of the test operator, and frequent switching affects the accurate collection of test data; on the other hand, the volume of the syringe-type energy storage device is limited , Therefore, when the seepage of the broken rock changes suddenly during the test, the water flow becomes larger. At this time, the water source provided by the injector energy storage device is insufficient, and the test has to be interrupted.

Contents of the invention

The object of the present invention is to provide a hydraulic osmotic pressure loading device for rock infiltration test, which realizes automatic water supply without interruption of water supply, and provides stable, continuous and adjustable osmotic pressure loading.

Embodiments of the present invention are achieved like this:

A hydraulic seepage pressure loading device for rock seepage tests, including a water tank and a first oil tank connected in sequence, a one-way variable pump, a speed control valve, a three-position four-way hydraulic reversing valve, a double-acting booster cylinder and a seepage Instrument, the one-way variable pump is connected with a safety protection device. The double-acting pressurized cylinder includes a first water chamber, a second water chamber, a first oil chamber and a second oil chamber. The dynamic reversing valve is connected. The water tank communicates with the first water chamber through the first water pipe provided with the first one-way valve, and the water tank communicates with the second water chamber through the second water pipe provided with the second one-way valve. The first water chamber communicates with the permeameter through a first water supply pipe provided with a third one-way valve, and the second water chamber communicates with the permeameter through a second water supply pipe provided with a fourth one-way valve. A first control oil circuit for controlling the switching of the three-position four-way hydraulic directional valve is also provided between the first oil chamber and the three-position four-way hydraulic directional valve, and between the second oil chamber and the three-position four-way hydraulic directional valve. There is also a second control oil circuit for controlling the switching of the three-position four-way hydraulic directional valve, the first control oil circuit is provided with a first sequence valve, and the second control oil circuit is provided with a second sequence valve.

In a preferred embodiment of the present invention, a filter is further provided between the first oil tank and the one-way variable displacement pump, and both ends of the filter communicate with the first oil tank and the one-way variable displacement pump respectively.

In a preferred embodiment of the present invention, a cooler is provided between the one-way variable pump and the three-position four-way hydraulic directional control valve, and the two ends of the cooler are respectively connected to the one-way variable variable pump and the three-position four-way hydraulic directional control valve. to the valve.

In a preferred embodiment of the present invention, the hydraulic osmotic pressure loading device for rock infiltration test also includes an accumulator, the accumulator is arranged between the double-acting pressurized cylinder and the permeameter, the first water supply pipe and the second The two water supply pipes are both connected with the water inlet end of the accumulator, and the water outlet end of the accumulator is connected with the osmometer.

In a preferred embodiment of the present invention, the hydraulic permeation pressure loading device for rock permeation test further includes a pressure sensor, and the pressure sensor is arranged on the pipeline between the accumulator and the permeation instrument.

In a preferred embodiment of the present invention, the hydraulic permeation pressure loading device for rock permeation test further includes a flow sensor, and the flow sensor is arranged on the pipeline between the accumulator and the permeameter.

In a preferred embodiment of the present invention, the above-mentioned first sequence valve and the second sequence valve are both internally controlled and externally drained sequence valves.

In a preferred embodiment of the present invention, the above-mentioned safety protection device includes an overflow valve, and the overflow valve communicates with the pipeline between the one-way variable pump and the speed regulating valve through the third oil pipe.

In a preferred embodiment of the present invention, the safety protection device further includes a second oil tank, and the outlet port of the overflow valve communicates with the second oil tank.

In a preferred embodiment of the present invention, the third oil pipe is also provided with a pressure gauge.

The beneficial effects of the embodiments of the present invention are: the first water chamber and the second water chamber of the double-acting pressurized cylinder of the hydraulic osmotic pressure loading device used for the rock penetration test communicate with the water tank through the first water pipe and the second water pipe, and then The first water supply pipe and the second water supply pipe communicate with the permeation meter, while the first oil chamber and the second oil chamber of the double-acting pressurized cylinder communicate with the three-position four-way hydraulic reversing valve through the first oil pipe and the second oil pipe. And the first oil chamber and the second oil chamber communicate with the three-position four-way hydraulic reversing valve through the first control oil circuit and the second control oil circuit respectively, and the first control oil circuit and the second control oil circuit are respectively provided with the first A sequence valve and a second sequence valve, so that when the pressure in the first oil chamber or the second oil chamber reaches the rated pressure of the corresponding sequence valve, the sequence valve can control the three-position four-way hydraulic reversing valve for reversing operation, In this way, the effect of automatic interactive water supply and pumping of dual water channels can be realized, and then the water supply and pressurization of the permeameter can be continuously increased. The above process realizes the test process through the interaction of dual water channels and dual-type four-oil channels, as well as the dual-channel water supply design. The automatic control of medium osmotic pressure saves man-hours and test costs, makes the water supply uninterrupted in the middle, and further improves the accuracy of test data.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a hydraulic osmotic pressure loading device for a rock infiltration test provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the double-acting booster cylinder provided by the present invention.

Icon: 10-hydraulic seepage pressure loading device for rock penetration test; 100-water tank; 110-first one-way valve; 120-second one-way valve; 130-third one-way valve; 140-fourth one-way valve Directional valve; 200-first fuel tank; 201-filter; 300-one-way variable pump; 301-cooler; 400-speed control valve; 500-three-position four-way hydraulic reversing valve; 510-first sequence valve; 520-second sequence valve; 600-double-acting booster cylinder; 610-first water chamber; 620-second water chamber; 630-first oil chamber; 640-second oil chamber; 650-piston rod; 660- The first piston; 670-the second piston; 680-the third piston; 700-permeameter; 701-accumulator; 702-pressure sensor; 703-flow sensor; Overflow valve; 830-the second fuel tank; 11-the first water pipe; 12-the second water pipe; 13-the first water supply pipe; 14-the second water supply pipe; 21-the first oil pipe; 22-the second oil pipe; 23- The third oil pipe; 24-the first control oil circuit; 25-the second control oil circuit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "left", "right" and so on is based on the orientation or positional relationship shown in the drawings, or the conventionally placed position when the product of the invention is used. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "setting", "installation" and "communication" should be understood in a broad sense, for example, it can be a fixed connection or an optional connection. Disassembled communication, or integrated communication; it can be mechanical communication or electrical communication; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Please refer to Fig. 1, this embodiment provides a kind of hydraulic penetration pressure loading device 10 for rock penetration test, which includes a water tank 100 and a first oil tank 200 connected in sequence, a one-way variable pump 300, a speed regulating valve 400, three Position four-way hydraulic reversing valve 500, double-acting pressurized cylinder 600 and permeation meter 700. The one-way variable pump 300 is connected with a safety protection device 800 .

The first oil tank 200 is a container for storing and providing oil to the hydraulic system, and its shape and size can be selected according to actual needs, for example, a rectangular parallelepiped oil tank or a cylindrical oil tank can be selected. In addition, the material can be metal or other materials such as fiberglass or plastic.

The one-way variable pump 300 is used to control the one-way transport of oil, and can transport the oil in the first oil tank 200 to the direction of the three-position four-way hydraulic reversing valve 500 . In addition, the displacement of the one-way variable pump 300 can be changed, which is beneficial to control the oil supply in the pipeline, stabilize the pressure, and further facilitate the rock penetration test. Preferably, a filter 201 is provided on the pipeline between the first oil tank 200 and the one-way variable displacement pump 300 , and there is a filter cartridge of a certain specification filter inside the filter 201 , and the oil is sucked by the one-way variable variable pump 300 Filter through the filter 201 first, and other impurities such as suspended solids and particles are intercepted by the filter 201, thereby reducing the turbidity of the oil in the subsequent pipeline, reducing the dirt of the system, and ensuring the normal operation of the hydraulic system and various components.

The speed regulating valve 400 is a valve used to control the flow of the oil circuit. Through the speed regulating valve 400, the oil flow in the pipeline can be changed and controlled to keep the oil flow in the pipeline stable, so as to control the pipeline that provides water pressure. flow. Preferably, a cooler 301 is also provided on the pipeline between the one-way variable pump 300 and the three-position four-way hydraulic reversing valve 500 , and further preferably, the cooler 301 is arranged between the one-way variable pump 300 and the speed regulating valve 400 In between, the cooler 301 can effectively control the oil temperature in the hydraulic system to prevent the oil temperature from being too high, thereby ensuring that the speed regulating valve 400, the three-position four-way hydraulic reversing valve 500, and the double-acting booster cylinder 600 can operate normally. operation, to ensure the stability of the entire hydraulic osmotic pressure loading device 10 used for rock penetration tests, and to prolong the service life of the device.

The three-position four-way hydraulic reversing valve 500 has three working positions of left, middle and right and four working ports communicated with external pipelines. The three-position four-way hydraulic reversing valve 500 communicates with the double-acting booster cylinder 600 through the first oil pipe 21 and the second oil pipe 22 . Further, since the oil flow rate at the outlet of the one-way variable pump 300 is relatively fast, in order to reduce the impact on the three-position four-way hydraulic reversing valve 500 and prolong the service life of the three-position four-way hydraulic reversing valve 500, preferably, The middle position of the pipeline and the three-position four-way hydraulic reversing valve 500 selects the "P" type, so that the oil entering the three-position four-way hydraulic reversing valve 500 can be diverted, effectively reducing the impact on the middle position.

Referring to FIG. 1 and FIG. 2 , the double-acting booster cylinder 600 includes a first water chamber 610 , a second water chamber 620 , and a first oil chamber 630 and a second oil chamber 640 . The first water chamber 610 and the second water chamber 620 are respectively arranged on two sides of the oil chamber composed of the first oil chamber 630 and the second oil chamber 640 . The double-acting booster cylinder 600 is also provided with a piston rod 650, the central position of the rod portion of the piston rod 650 is provided with a first piston 660, the two ends of the piston rod 650 are respectively provided with a second piston 670 and a third piston 680, the A piston 660 , a second piston 670 and a third piston 680 are all fixedly connected to the piston rod 650 . The first piston 660 is located in the oil chamber of the double-acting pressurized cylinder 600, and the two sides of the first piston 660 respectively form the first oil chamber 630 and the second oil chamber 640 isolated from each other, and the second piston 670 is located in the first water chamber In 610 , the third piston 680 is located in the second water cavity 620 . The first oil chamber 630 communicates with the three-position four-way hydraulic reversing valve 500 through the first oil pipe 21, and the second oil chamber 640 communicates with the three-position four-way hydraulic reversing valve 500 through the second oil pipe 22, so as to realize oil flow. supply. The first water chamber 610 of the double-acting pressurized cylinder 600 communicates with the water tank 100 through the first water pipe 11 , the second water chamber 620 of the double-acting pressurized cylinder 600 communicates with the water tank 100 through the second water pipe 12 , and the first water pipe 11 is provided with There is a first one-way valve 110, and the second water pipe 12 is provided with a second one-way valve 120 to realize the supply of water source. Wherein, the first one-way valve 110 and the second one-way valve 120 are set so that the water in the water tank 100 can only flow into the first water chamber 610 or the second water chamber 620, and will not flow into the first water chamber 610 or the second water chamber. When the water pressure in the water chamber 620 increases, the backflow of water occurs, and the water can only be transported to the osmometer 700 for testing.

In addition, a first control oil circuit 24 is also provided between the first oil chamber 630 and the three-position four-way hydraulic reversing valve 500. The right position of the dynamic reversing valve 500 is connected, and the first control oil passage 24 is provided with a first sequence valve 510 . There is also a second control oil circuit 25 between the second oil chamber 640 and the three-position four-way hydraulic reversing valve 500, and the two ends of the second control oil circuit 25 are connected to the second oil pipe 22 and the three-position four-way hydraulic reversing valve respectively The left position of the valve 500 is connected, and the second sequence valve 520 is provided on the second control oil passage 25 . Further, the oil outlet of the three-position four-way hydraulic reversing valve 500 is connected with a third oil tank (not shown in the figure), and the third oil tank is used to hold the oil returned from the first oil pipe 21 and the second oil pipe 22 .

Referring to the accompanying drawing 1 again, a safety protection device 800 is provided between the one-way variable displacement pump 300 and the speed regulating valve 400, the safety protection device 800 includes an overflow valve 820, and the relief valve 820 connects with the one-way variable displacement pump 300 through the third oil pipe 23 And the pipeline between the speed regulating valve 400 communicates. Preferably, the overflow valve 820 communicates with the pipeline between the one-way variable displacement pump 300 and the cooler 301 through the third oil pipe 23 . When the system is blocked, the pipeline pressure rises, the overflow valve 820 is opened, and the one-way variable pump 300 is unloaded to ensure the safety of the entire system. Further preferably, the safety protection device 800 further includes a second oil tank 830 , and the outlet port of the overflow valve 820 communicates with the second oil tank 830 , so that the oil flowing out of the overflow valve 820 can be stored in the second oil tank 830 . Further preferably, a pressure gauge 810 is also provided on the third oil pipe 23 , so that the pressure in the oil supply pipeline can be observed in real time through the pressure gauge 810 .

It should be noted that the first oil tank 200, the second oil tank 830 and the third oil tank may be connected through pipelines, or may be the same oil tank.

Through the above-mentioned structural setting, when the three-position four-way hydraulic reversing valve 500 is in the left position, when the oil controlled by it enters the first oil chamber 630, the oil in the first oil chamber 630 increases, the oil pressure increases, and the oil The liquid acts on the piston rod 650, so that the piston rod 650 moves to the right, so that the volume of the first water chamber 610 increases, the water tank 100 starts to supply water, and the water flows through the first one-way valve 110 and enters the first water chamber 610 along the first water pipe 11 , at the same time, the volume of the second water chamber 620 decreases, and the pressure of the water in the second water chamber 620 increases to be pushed out. When the oil pressure in the first oil chamber 630 increases to the rated pressure of the first sequence valve 510, the valve of the first sequence valve 510 is opened, and the oil returns to the three-position four-way hydraulic reversing valve 500 to control the three-position four-way valve. When the hydraulic reversing valve 500 is switched to the right position, during the process of the piston rod 650 moving to the right, the oil in the second oil chamber 640 flows back to the three-position four-way electromagnetic reversing valve 500 and flows back to the third oil tank for storage ,continue working. During the movement of the piston rod 650 to the right, the oil in the second oil chamber 640 flows back to the three-position four-way electromagnetic reversing valve 500 and flows back to the third oil tank for storage.

When the three-position four-way hydraulic reversing valve 500 is switched to the right position, when the oil controlled by it enters the second oil chamber 640, the oil in the second oil chamber 640 increases, the oil pressure increases, and the oil acts on the piston. Rod 650, so that the piston rod 650 moves to the left, so that the volume of the second water chamber 620 increases, the water tank 100 starts to supply water, and the water flows through the second one-way valve 120 and enters the second water chamber 620 along the second water pipe 12. At the same time, the second water chamber 620 The volume of the first water chamber 610 decreases, and the pressure of the water in the first water chamber 610 increases to be pushed out. When the oil pressure in the second oil chamber 640 increases to the rated pressure of the second sequence valve 520, the valve of the second sequence valve 520 is opened, and the oil returns to the three-position four-way hydraulic reversing valve 500 to control the three-position four-way valve. Pass hydraulic reversing valve 500 and switch to left position, continue to work. During the movement of the piston rod 650 to the left, the oil in the first oil chamber 630 flows back to the three-position four-way electromagnetic reversing valve 500 and flows back to the third oil tank for storage.

Preferably, both the first sequence valve 510 and the second sequence valve 520 are internally controlled and externally drained sequence valves. The first sequence valve 510 and the second sequence valve 520 only have two states of open and cut off, and the sequence valve is in the open state only when the internal pressure of the pipeline reaches the rated pressure of the sequence valve. While the hydraulic system maintains a certain pressure, the reciprocating circulation of the oil in the double-type four-oil circuit is realized, so that the entire hydraulic system can circulate and work continuously.

The permeameter 700 is a device for placing rocks and applying water to the rocks in the rock penetration test. The permeameter 700 communicates with the first water chamber 610 through the first water supply pipe 13; It communicates with the second water chamber 620 . The first water supply pipe 13 is provided with a third one-way valve 130 , and the second water supply pipe 14 is provided with a fourth one-way valve 140 . Therefore, the water in the first water chamber 610 and the second water chamber 620 can be supplemented alternately in the permeameter 700, so as to maintain the water pressure in the permeameter 700 and act on the rocks tested inside it. At the same time, due to the third The existence of the one-way valve 130 and the fourth one-way valve 140 prevents the water in the permeameter 700 from flowing back into the first water chamber 610 or the second water chamber 620 .

Preferably, the hydraulic osmotic pressure loading device 10 for the rock infiltration test also includes an accumulator 701, the accumulator 701 is arranged between the double-acting pressurized cylinder 600 and the permeameter 700, the first water supply pipe 13 and the second Both water supply pipes 14 communicate with the water inlet end of the accumulator 701 , and the water outlet end of the accumulator 701 communicates with the osmometer 700 . Therefore, it can not only act on the water transmitted by the first water supply pipe 13, but also act on the water transmitted by the second water supply pipe 14. When the internal water pressure of the first water supply pipe 13 or the second water supply pipe 14 exceeds the accumulator 701 When the internal pressure of the first water supply pipe 13 or the second water supply pipe 14 will compress the gas inside the accumulator 701, the pressure of the water will be converted into gas internal energy; the first water supply pipe 13 or the second water supply pipe 14 will When the internal water pressure is lower than the internal pressure of the accumulator 701, the water in the accumulator 701 flows to the hydraulic system under the action of high-pressure gas, thereby slowing down the sudden change in the flow rate on the first water supply pipe 13 or the second water supply pipe 14, Ensure the stability of water supply. Therefore, the sudden change in water supply caused by the three-position four-way hydraulic reversing valve 500 can be slowed down when the oil circuit is switched, so that the water pressure in the permeameter 700 can increase more gently and stably.

Preferably, the hydraulic permeation pressure loading device 10 for rock permeation test further includes a pressure sensor 702 , and the pressure sensor 702 is arranged on the pipeline between the accumulator 701 and the permeation instrument 700 . The pressure on the pipeline can be observed in real time through the pressure sensor 702, so as to monitor and adjust the experimental process. Further preferably, the hydraulic permeation pressure loading device 10 for rock permeation test further includes a flow sensor 703 , and the flow sensor 703 is also arranged on the pipeline between the accumulator 701 and the permeameter 700 . Similarly, the flow of water passing into the permeameter 700 can be observed in real time through the flow sensor 703 to monitor the experimental process.

It should be noted that the pressure sensor 702 and the flow sensor 703 can be interchanged, that is, the pressure sensor 702 can be installed first along the water flow direction, and then the flow sensor 703 can be installed; or the flow sensor 703 can be installed first along the water flow direction, and then the pressure sensor 702 .

It can be seen from the above description of the structure of the hydraulic seepage pressure loading device 10 for the rock seepage test that its specific operation steps are as follows:

Step 1: Start the one-way variable pump 300. When the working position of the three-position four-way hydraulic reversing valve 500 is in the neutral position, the double-acting booster cylinder 600 is pinned tight, and all oil and water pipes are not working and are on standby. state.

Step 2: When the left position of the three-position four-way hydraulic reversing valve 500 is turned on, the first oil tank 200 starts to supply oil, and the oil enters the first oil chamber 630 of the double-acting booster cylinder 600 through the first oil pipe 21 . During the movement of the piston rod 650 to the right, the volume of the first water chamber 610 increases, and the water tank 100 starts to supply water. 610 is filled with water. At the same time, the volume of the second water chamber 620 decreases, water flows through the fourth one-way valve 140 along the second water supply pipe 14, passes through the accumulator 701, the pressure sensor 702 and the flow sensor 703, enters the permeameter 700 and acts on the permeameter 700 Rocks for testing.

Step 3: When the piston rod 650 moves rightward to the limit position, that is, when the pressure in the first oil chamber 630 reaches the rated pressure of the first sequence valve 510, the first sequence valve 510 on the first control oil circuit 24 works, thereby Control the three-position four-way hydraulic directional control valve 500 to work, and the three-position four-way hydraulic directional control valve 500 is switched to the right position, and continues to work. During the movement of the piston rod 650 to the right, the oil in the second oil chamber 640 flows back to the three-position four-way electromagnetic reversing valve 500 and flows back to the third oil tank for storage.

Step 4: The three-position four-way hydraulic reversing valve 500 is connected to the right position, and the oil passes through the second oil pipe 22 and enters the second oil chamber 640 of the double-acting booster cylinder 600 . During the movement of the piston rod 650 to the left, the volume of the second water chamber 620 increases, the water tank 100 starts to supply water, and the water flows through the second check valve 120 and enters the second water chamber 620 along the second water pipe 12 until the second water chamber 620 is filled with water. At the same time, the volume of the first water chamber 610 decreases, water flows through the third one-way valve 130 along the first water supply pipe 13, passes through the accumulator 701, the pressure sensor 702 and the flow sensor 703 and continuously enters the osmometer 700 and continues to act on the osmometer. 700 rocks for testing.

Step 5: When the piston rod 650 moves to the left to the limit position, that is, the pressure in the second oil chamber 640 of the double-acting booster cylinder 600 reaches the rated pressure of the second sequence valve 520, the second sequence of the first control oil circuit 24 The valve 520 works to control the work of the three-position four-way hydraulic directional control valve 500, and the three-position four-way hydraulic directional control valve 500 switches to the left position and continues to work. During the movement of the piston rod 650 to the left, the oil in the first oil chamber 630 flows back to the three-position four-way electromagnetic reversing valve 500 and flows back to the third oil tank for storage.

Step 6: Repeat steps 2 to 5 to realize automatic and continuous water supply until the rock penetration test is completed.

Step 7: When the system is blocked, the pipeline pressure rises, the overflow valve 820 is opened, and the one-way variable pump 300 is unloaded to ensure the safety of the entire system.

In summary, the hydraulic seepage pressure loading device used for rock seepage tests realizes the effect of automatic interactive water supply and pumping of dual water channels through double-acting pressurized cylinders, and uses pressure to control the two types of oil channels to form a reciprocating cycle loop, thereby controlling the double-acting pressure. The dual water supply channels of the booster cylinder are automatically switched and the water source is supplied automatically, which solves the drawbacks of water supply interruption in the middle of the original control by the water pump station, oil pump station and syringe type energy storage device; at the same time, the double-acting booster cylinder and pressure control reciprocating cycle circuit are used , realized the dual pipeline interactive working mode of one pipeline supplying oil-water, and the other pipeline returning oil-pumping, achieved the effect of automatic pumping, replaced the water pumping station, and solved the problem that the overflow valve in the water pumping station is easy to rust and through the pipeline interaction of dual-water channels and dual-type four-oil channels, as well as the dual-channel water supply design, the automatic control of the osmotic pressure during the test process is realized, and the loaded pressure is stable, continuous, and adjustable, saving man-hours , which saves the test cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The hydraulic osmotic pressure loading device for rock permeation test is characterized by comprising a water tank (100), a first oil tank (200), a unidirectional variable pump (300), a speed regulating valve (400), a three-position four-way hydraulic reversing valve (500), a double-acting booster cylinder (600) and a permeameter (700), wherein the first oil tank (200), the unidirectional variable pump (300), the speed regulating valve (400), the three-position four-way hydraulic reversing valve, the double-acting booster cylinder (600) and the permeameter (700) are sequentially communicated, and the unidirectional variable pump (300) is communicated with a safety protection device (800);

the double-acting booster cylinder (600) comprises a first water cavity (610), a second water cavity (620), a first oil cavity (630) and a second oil cavity (640), wherein the first oil cavity (630) and the second oil cavity (640) are respectively communicated with the three-position four-way hydraulic reversing valve (500) through a first oil pipe (21) and a second oil pipe (22); the water tank (100) is communicated with the first water cavity (610) through a first water pipe (11) provided with a first one-way valve (110), and the water tank (100) is communicated with the second water cavity (620) through a second water pipe (12) provided with a second one-way valve (120); the first water cavity (610) is communicated with the permeameter (700) through a first water supply pipe (13) provided with a third one-way valve (130), and the second water cavity (620) is communicated with the permeameter (700) through a second water supply pipe (14) provided with a fourth one-way valve (140);

a first control oil way (24) for controlling the switching of the three-position four-way hydraulic reversing valve (500) is further arranged between the first oil cavity (630) and the three-position four-way hydraulic reversing valve (500), a second control oil way (25) for controlling the switching of the three-position four-way hydraulic reversing valve (500) is further arranged between the second oil cavity (640) and the three-position four-way hydraulic reversing valve (500), a first sequence valve (510) is arranged on the first control oil way (24), and a second sequence valve (520) is arranged on the second control oil way (25);

the double-acting booster cylinder (600) is internally provided with a piston rod (650), a first piston (660) is arranged at the central position of the rod part of the piston rod (650), two ends of the piston rod (650) are respectively provided with a second piston (670) and a third piston (680), the first piston (660), the second piston (670) and the third piston (680) are fixedly connected with the piston rod (650), the first piston (660) is positioned in an oil cavity of the double-acting booster cylinder (600), two sides of the first piston (660) respectively form a first oil cavity (630) and a second oil cavity (640) which are isolated from each other, the second piston (670) is positioned in the first water cavity (610), and the third piston (680) is positioned in the second water cavity (620).

2. The hydraulic osmotic pressure loading device for rock permeation test according to claim 1, wherein a filter (201) is further provided between the first oil tank (200) and the unidirectional variable pump (300), and both ends of the filter (201) are respectively communicated with the first oil tank (200) and the unidirectional variable pump (300).

3. The hydraulic osmotic pressure loading device for rock permeation test according to claim 1, wherein a cooler (301) is further arranged between the unidirectional variable pump (300) and the three-position four-way hydraulic reversing valve (500), and two ends of the cooler (301) are respectively communicated with the unidirectional variable pump (300) and the speed regulating valve (400).

4. The hydraulic osmotic pressure loading device for rock permeation test according to claim 1, further comprising an accumulator (701), wherein the accumulator (701) is arranged between the double-acting booster cylinder (600) and the permeameter (700), wherein the first water supply pipe (13) and the second water supply pipe (14) are both communicated with the water inlet end of the accumulator (701), and the water outlet end of the accumulator (701) is communicated with the permeameter (700).

5. The hydraulic osmotic pressure loading device for rock permeation testing according to claim 4, further comprising a pressure sensor (702), the pressure sensor (702) being arranged on a pipeline between the accumulator (701) and the permeameter (700).

6. The hydraulic osmotic pressure loading device for rock permeation testing according to claim 4, further comprising a flow sensor (703), the flow sensor (703) being arranged on a pipeline between the accumulator (701) and the permeameter (700).

7. The hydraulic osmotic pressure loading device for rock permeation test according to any one of claims 1 to 6, wherein the first sequence valve (510) and the second sequence valve (520) are both internal control and external release sequence valves.

8. Hydraulic osmotic pressure loading device for rock permeation test according to any of claims 1-6, characterized in that the safety protection device (800) comprises an overflow valve (820), which overflow valve (820) communicates with the piping between the unidirectional variable pump (300) and the speed valve (400) through a third oil pipe (23).

9. The hydraulic osmotic pressure loading device for rock permeation test according to claim 8, wherein the safety protection device (800) further comprises a second oil tank (810), and the outlet end of the overflow valve (820) is in communication with the second oil tank (810).

10. Hydraulic osmotic pressure loading device for rock penetration test according to claim 8, characterized in that the third oil pipe (23) is further provided with a pressure gauge (810).

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