A rock triaxial test pressure chamber convenient for specimen installation

Abstract

The present invention relates to the technical field of rock testing devices, and discloses a rock triaxial test pressure chamber that is convenient for sample installation, comprising a lower end cover, an upper end cover, and a bearing cylinder detachably mounted between the lower end cover and the upper end cover, and a through hole is provided in the middle of each of the lower end cover and the upper end cover, a lower pressure head and an upper pressure head are mounted at the two through holes, and the lower end cover and the upper end cover are also provided with a pressure-bearing cylinder, a test cylinder for testing the sample is coaxially mounted on the inner side of the pressure-bearing cylinder, and a liquid storage chamber for storing oil is formed between the test cylinder and the pressure-bearing cylinder. The pressure chamber proposed by the present invention has a pressure-bearing cylinder that can rotate on one side of the oil storage chamber for storing oil, thereby facilitating the automatic discharge of the oil therein, and an extrusion mechanism is provided to assist in the discharge of the oil, making the operation convenient and quick, and the oil discharge sufficient and thorough.

Description

Technical Field

[0001] The invention relates to the technical field of rock testing devices, in particular to a rock triaxial test pressure chamber which is convenient for sample installation. Background Art

[0002] Rock triaxial tests are divided into true triaxial and pseudo triaxial tests. Pseudo triaxial tests usually exhibit axial rigid loading and peripheral flexible loading; while true triaxial tests often have two loading modes: rigid loading in three directions, rigid loading in two directions and flexible loading in one direction.

[0003] Current triaxial compression tests involve placing a rock specimen in a round steel cylinder, placing a heat shrink tubing over the specimen, and then applying liquid oil pressure to provide lateral confining pressure. In previous tests, all the oil had to be drained out. However, the existing test device's pressure chambers are not easy to drain, and the oil drainage is not sufficient and thorough. Summary of the Invention

[0004] In order to solve the technical problems raised in the background technology, the present invention provides a rock triaxial test pressure chamber which is convenient for sample installation.

[0005] The present invention is implemented by the following technical solution: a rock triaxial test pressure chamber that is convenient for sample installation, comprising a lower end cover, an upper end cover, and a bearing cylinder that is detachably installed between the lower end cover and the upper end cover, and a through hole is provided in the middle of the lower end cover and the upper end cover, a lower pressure head and an upper pressure head are respectively installed at the two through holes, and the lower end cover and the upper end cover are also provided with a pressure-bearing cylinder, a test cylinder for testing the sample is coaxially installed on the inner side of the pressure-bearing cylinder, and a liquid storage chamber for storing oil is formed between the test cylinder and the pressure-bearing cylinder.

[0006] An oil inlet channel is provided on the upper end cover.

[0007] As a further improvement of the above scheme, the lower end cover is provided with an annular mounting groove on the side of the liquid storage chamber, and the side of the pressure cylinder close to the lower end cover is connected to an annular bottom plate located in the mounting groove. A number of connecting holes are distributed circumferentially on the annular bottom plate, and the lower end cover is also provided with an oil outlet hole that can be connected to the connecting hole. The pressure cylinder can rotate between the lower end cover and the upper end cover so that the connecting hole and the oil outlet hole are connected or closed. A collecting box is installed at the bottom of the lower end cover, and the interior of the collecting box is connected to each oil outlet hole.

[0008] Through the above solution, the oil can flow through the connecting holes on the annular bottom plate to the oil outlet hole for discharge.

[0009] As a further improvement of the above scheme, several connecting rods three extending radially are fixed on the outer wall of the pressure cylinder. One end of the connecting rod three is movable through the bearing cylinder and is connected to an adjustment mechanism. The adjustment mechanism is used to drive the connecting rod three to drive the pressure cylinder to rotate.

[0010] The adjusting mechanism can more conveniently drive the pressure-bearing cylinder to rotate, thereby making the communicating hole and the oil outlet hole connected or closed.

[0011] As a further improvement of the above scheme, the adjustment mechanism includes an adjustment motor installed on the upper end cover and an adjustment gear connected to the output end of the adjustment motor. An annular rotating plate is coaxially installed on the top surface of the upper end cover. The inner ring of the rotating plate is provided with a ring gear, and the ring gear is engaged with the adjustment gear. Several connecting rods 1 corresponding to connecting rod 3 are circumferentially distributed on the outer ring of the rotating plate. The connecting rod 1 and the corresponding connecting rod 3 are connected through connecting rod 2.

[0012] In this solution, the adjustment motor can be used with an external power supply. The rotation of the adjustment motor drives the adjustment gear to rotate, thereby driving the annular rotating plate to rotate, thereby driving the connecting rod three to move along the adjustment bayonet, and finally driving the pressure cylinder to rotate.

[0013] As a further improvement of the above solution, a plurality of adjustment bayonets corresponding to the connecting rod three are provided on the shell of the carrying cylinder, and the connecting rod three can move in the corresponding adjustment bayonets.

[0014] The provision of an adjustment bayonet can facilitate the installation and use of the connecting rod three.

[0015] As a further improvement of the above solution, in order to allow the oil in the liquid storage chamber to be automatically discharged and discharged fully and thoroughly, an extrusion mechanism for draining the oil is also installed in the liquid storage chamber.

[0016] As a further improvement to the above solution, the extrusion mechanism includes a separately disposed movable pressure plate and a sealing unit. The movable pressure plate is movably disposed within the oil reservoir chamber and defines an oil hole corresponding to the oil outlet of the oil inlet channel. The sealing unit is also movably disposed below the movable pressure plate and is capable of sealing the oil hole. The side of the movable pressure plate is in sealing contact with the inner wall of the oil reservoir chamber, and an elastic sealing ring may be installed on the side of the movable pressure plate to enhance its sealing performance.

[0017] As a further improvement to the above solution, a movable pressure plate can be vertically slidably connected to the test cylinder and the housing of the pressure cylinder. The blocking unit includes a blocking column and a movable plate. The movable plate is vertically slidably connected to the test cylinder and the housing of the pressure cylinder. The blocking column is fixed above the movable plate and can be inserted into the oil hole. In this way, when the movable pressure plate moves downward, the blocking column is inserted into the oil hole, forming a sealed structure, which facilitates squeezing the oil below the movable pressure plate out of the oil storage chamber.

[0018] As a further improvement of the above scheme, the density of the blocking column and the movable plate is lower than the density of the oil stored in the oil storage chamber, so that the movable plate and the blocking column can automatically float to the top of the oil storage chamber, and when in use, the blocking column can be inserted into the oil hole on the movable pressure plate under the action of buoyancy and pressure, so that the oil can be drained more fully and thoroughly, and a processing hole is opened on the upper end cover, and the top surface of the movable pressure plate can seal the bottom port of the processing hole, and the auxiliary pressure rod can be inserted through the processing hole to drive the movable pressure plate to move in the oil storage chamber, thereby squeezing the oil into the collection box.

[0019] As a further improvement of the above solution, when the blocking unit is at its maximum longitudinal height, the blocking column is separated from the oil hole, and the movable pressure plate may be magnetic, so that the auxiliary pressure rod through the processing hole can be magnetically attracted to the movable pressure plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The rock triaxial test pressure chamber proposed in the present invention includes a lower end cover, an upper end cover and a bearing cylinder detachably installed between the lower end cover and the upper end cover, and a through hole is provided in the middle of the lower end cover and the upper end cover, and a lower pressure head and an upper pressure head are installed at the two through holes respectively, and the lower end cover and the upper end cover are also provided with a pressure-bearing cylinder, and a test cylinder for testing the sample is coaxially installed on the inner side of the pressure-bearing cylinder, and a liquid storage chamber for storing oil is formed between the test cylinder and the pressure-bearing cylinder.

[0022] The pressure chamber proposed in the present invention has a rotatable pressure-bearing cylinder on one side of the oil storage chamber for storing oil, so as to facilitate the automatic discharge of the oil therein, and is provided with an extrusion mechanism to assist in the discharge of the oil. The operation is convenient and quick, and the oil is discharged fully and thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the pressure cabin proposed by the present invention;

[0024] Figure 2 This is a top view of the pressure-bearing cylinder proposed by the present invention;

[0025] Figure 3 For the present invention Figure 1 A magnified view of point A;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of point B;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the supporting tube of the present invention.

[0028] Description of main symbols:

[0029] In the figure: lower end cover 1, upper end cover 2, test cylinder 3, lower pressure head 4, upper pressure head 5, bearing cylinder 6, pressure cylinder 7, through hole 8, collecting box 9, oil outlet hole 10, connecting hole 11, mounting groove 12, annular bottom plate 13, adjusting motor 14, adjusting gear 15, connecting rod 16, connecting rod 2 17, connecting rod 3 18, processing hole 19, movable pressure plate 20, blocking column 21, movable plate 22, adjusting bayonet 23, oil inlet channel 24, oil hole 25. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] Example 1:

[0032] The present invention proposes a rock triaxial test pressure chamber which is convenient for sample installation, comprising a lower end cover 1, an upper end cover 2 and a bearing cylinder 6 which is detachably mounted between the lower end cover 1 and the upper end cover 2, and a through hole is provided in the middle of each of the lower end cover 1 and the upper end cover 2, a lower pressure head 4 and an upper pressure head 5 are respectively mounted at the two through holes, and the lower end cover 1 and the upper end cover 2 are further provided with a pressure cylinder 7, a test cylinder 3 for testing the sample is coaxially mounted on the inner side of the pressure cylinder 7, and a liquid storage chamber for storing oil is formed between the test cylinder 3 and the pressure cylinder 7.

[0033] Please refer to Figure 1 In order to facilitate the injection of extrusion oil, an oil inlet channel 24 is opened on the upper end cover 2, and a valve can be installed at the end of the oil inlet channel 24 to open and close the oil inlet channel.

[0034] Reference Figure 1 An annular mounting groove 12 is provided on the side of the lower end cover 1 located in the liquid storage chamber. The cross-section of the mounting groove 12 is circular, and the bottom surface of the mounting groove 12 is smooth. The side of the pressure-bearing cylinder 7 close to the lower end cover 1 is connected to an annular bottom plate 13 located in the mounting groove 12. Several communicating holes 11 are distributed circumferentially on the annular bottom plate 13. The communicating holes are notch-shaped, and the distance from the axis of the annular bottom plate 13 at each position in the length direction of the communicating holes 11 gradually changes. The lower end cover 1 is also provided with an oil outlet 10 that can be connected with the communicating hole 11. The pressure-bearing cylinder 7 can rotate between the lower end cover 1 and the upper end cover 2 so that the communicating hole 11 and the oil outlet hole 10 are connected or closed. A collecting box 9 is installed at the bottom of the lower end cover 1, and the interior of the collecting box 9 is connected with each oil outlet hole 10.

[0035] By rotating the annular bottom plate 13 , when the annular bottom plate 13 is at a certain position, the oil can flow through the connecting holes on the annular bottom plate 13 to the oil outlet hole 10 for discharge.

[0036] Specific reference Figure 1 、 Figure 3 Several connecting rods 3 18 extending radially are fixed to the outer wall of the pressure-bearing cylinder 7. One end of the connecting rod 3 18 movably passes through the bearing cylinder 6 and is connected to an adjustment mechanism. The adjustment mechanism is used to drive the connecting rod 3 18 to rotate the pressure-bearing cylinder 7. The adjustment mechanism makes it easier to drive the pressure-bearing cylinder 7 to rotate, thereby connecting or closing the connecting hole 11 and the oil outlet hole 10.

[0037] The adjustment mechanism includes an adjustment motor 14 mounted on the upper end cover 2 and an adjustment gear 15 connected to the output end of the adjustment motor 14. An annular rotating plate is coaxially mounted on the top surface of the upper end cover 2. The inner ring of the rotating plate is provided with a ring gear that meshes with the adjustment gear 15. The outer ring of the rotating plate is circumferentially distributed with several connecting rods 16 corresponding to connecting rods 3 18. Connecting rods 16 and corresponding connecting rods 3 18 are connected by connecting rods 2 17. Connecting rods 16, 2 17, and 3 18 are all stainless steel rods with high strength and toughness.

[0038] In this solution, the adjustment motor 14 can be used with an external power supply. The rotation of the adjustment motor drives the adjustment gear 15 to rotate, thereby driving the annular rotating plate to rotate, thereby driving the connecting rod 3 18 to move along the adjustment bayonet 23, and finally driving the pressure cylinder 7 to rotate.

[0039] Reference Figure 5 The housing of the carrying cylinder 6 is provided with a plurality of adjustment bayonets 23 corresponding to the connecting rod 3 18, and the connecting rod 3 18 can move in the corresponding adjustment bayonets 23. The adjustment bayonet 23 is provided to facilitate the installation and use of the connecting rod 3 18.

[0040] In order to allow the oil in the liquid storage chamber to be automatically discharged and discharged fully and thoroughly, an extrusion mechanism for discharging the oil is also installed in the liquid storage chamber.

[0041] As an optional embodiment of the present invention, the extrusion mechanism includes a movable pressure plate 20 and a sealing unit that are separately arranged. The movable pressure plate 20 is movably arranged in the oil storage chamber. The movable pressure plate 20 is provided with an oil hole 25 corresponding to the oil outlet end of the oil inlet channel 24. The sealing unit is also movably arranged below the movable pressure plate 20, and the sealing unit is capable of sealing the oil hole 25. The side of the movable pressure plate 20 is in sealing contact with the inner wall of the oil storage chamber. An elastic sealing ring can be installed on the side of the movable pressure plate 20 to enhance its sealing performance. When the oil is injected, the oil squeezes the sealing unit through the oil hole 25, thereby smoothly entering the oil storage chamber, and the position of the oil hole corresponds to the position of the inner end of the oil inlet channel 24.

[0042] The movable pressure plate 20 is vertically slidably connected to the test cylinder 3 and the housing of the pressure-bearing cylinder 7. The blocking unit includes a blocking column 21 and a movable plate 22. The movable plate 22 is vertically slidably connected to the test cylinder 3 and the housing of the pressure-bearing cylinder 7. The blocking column 21 is fixed above the movable plate 22 and can be inserted into the oil hole 25. In this way, when the movable pressure plate 20 moves downward, the blocking column 21 is inserted into the oil hole 25, thereby forming a sealed structure, which facilitates squeezing the oil below the movable pressure plate 20 out of the oil storage chamber.

[0043] The density of the blocking column 21 and the movable plate 22 is lower than the density of the oil stored in the oil storage chamber, so that the movable plate and the blocking column 21 can automatically float to the top of the oil storage chamber. When in use, the blocking column 21 can be inserted into the oil hole 25 on the movable pressure plate under the action of buoyancy and pressure, so that the oil can be discharged more fully and thoroughly. A processing hole 19 is provided on the upper end cover 2, and the top surface of the movable pressure plate 20 can seal the bottom port of the processing hole 19, and an auxiliary pressure rod can be inserted through the processing hole 19 to drive the movable pressure plate 20 to move in the oil storage chamber, thereby squeezing the oil into the collection box 9.

[0044] In an optional embodiment of the present invention, when the blocking unit is at its maximum longitudinal height, the blocking column 21 is separated from the oil hole 25, and the movable pressure plate 20 may be magnetic, and the auxiliary pressure rod through the processing hole 19 can be magnetically attracted to the movable pressure plate 20, so that when the oil is discharged, the magnetic force can be used to drive the movable pressure plate 20 to return to its original position, that is, the top position in the oil storage chamber.

[0045] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A rock triaxial test pressure chamber that is convenient for sample installation, characterized in that: The apparatus comprises a lower end cover, an upper end cover, and a bearing cylinder detachably mounted between the lower and upper end covers, wherein a through hole is provided in the middle of each of the lower and upper end covers, a lower pressure head and an upper pressure head are mounted at the two through holes, and a pressure-bearing cylinder is provided on the lower and upper end covers, wherein a test cylinder for testing a sample is coaxially mounted on the inner side of the pressure-bearing cylinder, and a liquid storage chamber for storing oil is formed between the test cylinder and the pressure-bearing cylinder; An oil inlet channel is provided on the upper end cover; The lower end cover is provided with an annular mounting groove on the side of the liquid storage chamber, and the side of the pressure-bearing cylinder close to the lower end cover is connected to an annular bottom plate located in the mounting groove, a plurality of communication holes are distributed circumferentially on the annular bottom plate, and the lower end cover is also provided with an oil outlet hole that can be connected to the communication hole, the pressure-bearing cylinder can rotate between the lower end cover and the upper end cover to connect or close the communication hole and the oil outlet hole, and a collection box is installed at the bottom of the lower end cover, and the interior of the collection box is connected to each oil outlet hole; A plurality of connecting rods 3 extending radially along the outer wall of the pressure-bearing cylinder are fixed thereto, one end of the connecting rod 3 being movable through the bearing cylinder and connected to an adjustment mechanism, the adjustment mechanism being used to drive the connecting rod 3 to drive the pressure-bearing cylinder to rotate; The adjustment mechanism includes an adjustment motor mounted on the upper end cover, an adjustment gear connected to the output end of the adjustment motor, an annular rotating plate coaxially mounted on the top surface of the upper end cover, a gear ring provided on the inner ring of the rotating plate, and the gear ring is engaged with the adjustment gear, and a plurality of connecting rods 1 corresponding to the connecting rods 3 are distributed circumferentially on the outer ring of the rotating plate, and the connecting rods 1 and the corresponding connecting rods 3 are connected by connecting rods 2; An extrusion mechanism for draining oil is also installed in the liquid storage chamber. The extrusion mechanism includes a movable pressure plate and a sealing unit that are separately arranged. The movable pressure plate is movably arranged in the oil storage chamber. An oil hole corresponding to the oil outlet end of the oil inlet channel is opened on the movable pressure plate, and the sealing unit is also movably arranged below the movable pressure plate, and the sealing unit can seal the oil hole.

2. A rock triaxial test pressure chamber for easy specimen installation as claimed in claim 1, characterized in that: The shell of the carrying cylinder is provided with a plurality of adjustment bayonets corresponding to the connecting rod three, and the connecting rod three can move in the corresponding adjustment bayonets.

3. A rock triaxial test pressure chamber for easy specimen installation as claimed in claim 1, characterized in that: The movable pressure plate can be vertically slidably connected to the shell of the test cylinder and the pressure cylinder, and the blocking unit includes a blocking column and a movable plate, wherein the movable plate and the shell of the test cylinder and the pressure cylinder are vertically slidably connected, the blocking column is fixed above the movable plate, and the blocking column can be inserted into the oil hole.

4. A rock triaxial test pressure chamber for easy specimen installation as claimed in claim 3, characterized in that: The density of the blocking column and the movable plate is lower than the density of the oil stored in the oil storage chamber, and a processing hole is provided on the upper end cover. The top surface of the movable pressure plate can seal the bottom port of the processing hole, and an auxiliary pressure rod can be inserted through the processing hole to drive the movable pressure plate to move in the oil storage chamber, thereby squeezing the oil into the collection box.

5. A rock triaxial test pressure chamber for easy specimen installation as claimed in claim 4, characterized in that: When the blocking unit is at its maximum height in the longitudinal direction, the blocking column is separated from the oil hole, and the movable pressure plate is magnetic, so the auxiliary pressure rod passing through the processing hole can be magnetically attracted to the movable pressure plate.

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