Rock compression test device and method

Abstract

The invention discloses a rock compression test device and method.The rock compression test device comprises a shell assembly, a pressurizing device and a to-be-tested piece bearing mechanism, two sets of bidirectional strain measurement mechanisms are symmetrically arranged at the top of the to-be-tested piece bearing mechanism, and pushing reset mechanisms are arranged on the sides, away from each other, of the two sets of bidirectional strain measurement mechanisms; a first driving mechanism is arranged at the top of an inner cavity of the shell assembly. A second driving mechanism is arranged at the bottom end of the first driving mechanism. The first driving mechanism drives the second driving mechanism to move downwards, the second driving mechanism pushes the pushing reset mechanism in the downward moving process, the pushing reset mechanism drives the bidirectional strain measurement mechanism to clamp and position a to-be-tested piece after being pushed and prepares a test, and the first driving mechanism drives the to-be-tested piece bearing mechanism. And the to-be-tested piece supporting mechanism throws the fragments. The clamping and positioning operation of the test piece to be tested is automatically completed, and fragments generated due to the fact that the test piece is damaged can be cleaned and collected after the test is completed.

Description

Technical Field

[0001] The invention belongs to a testing mechanism, and in particular relates to a rock compression testing device and method. Background Art

[0002] The uniaxial compression deformation test of rock is to determine the axial strain value and radial strain value of the specimen under uniaxial compression stress conditions, and calculate the elastic modulus and Poisson's ratio of the rock based on this. The elastic modulus and Poisson's ratio of rock obtained from the uniaxial compression deformation test are the most basic parameters of rock deformation characteristics. These two parameters are indispensable when performing various calculations.

[0003] In the prior art, the above test can be divided into resistance strain method, displacement meter method and LVDT sensor method, which are applicable to various types of rocks that can be made into regular specimens. Among them, the displacement meter method is suitable for the test of relatively soft rocks and soft rocks. In actual tests, three specimens are tested in parallel for each group of tests, and the test results should be the average value of the results measured on the three specimens.

[0004] However, after actual application by technicians skilled in the art, it was found that the above-mentioned test device for relatively soft rock and soft rock still has some shortcomings. The most obvious one is that after the operator completes the placement of the test piece, he needs to manually fix the stand carrying the micrometer to the outside of the test piece, and then manually adjust the micrometer on the stand so that the micrometer head contacts the outer surface of the test piece. The operation process is cumbersome and time-consuming.

[0005] In addition, after the test is completed, the test piece will be broken under the action of pressure, and the small fragments produced during the breakage process will fall directly on the top of the workbench. When conducting subsequent tests on other test pieces in the same group, the small fragments need to be cleaned manually to avoid the small fragments affecting the placement of other test pieces in the same group. This is too manpower-consuming and will affect the overall test efficiency. Summary of the invention

[0006] The present invention provides a rock compression test device and method, so as to realize the automatic completion of the clamping and positioning operation of a test piece, and after the test is completed, the fragments generated by the destruction of the test piece can be cleaned and collected.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0008] A rock compression test device comprises a shell assembly, wherein a pressurizing device is arranged at the top of the inner cavity of the shell assembly, a supporting mechanism for a test piece is arranged at the middle of the inner cavity of the shell assembly, two groups of bidirectional strain measuring mechanisms are symmetrically arranged at the top of the supporting mechanism for the test piece, a pushing and resetting mechanism is arranged at the sides of the two groups of bidirectional strain measuring mechanisms away from each other, a first driving mechanism is arranged at the top of the inner cavity of the shell assembly, and a second driving mechanism is arranged at the bottom end of the first driving mechanism;

[0009] The first driving mechanism drives the second driving mechanism to move downward, and the second driving mechanism pushes the pushing and resetting mechanism during the downward movement. After being pushed, the pushing and resetting mechanism drives the bidirectional strain measuring mechanism to clamp and position the test piece and prepare for the test. The first driving mechanism drives the supporting mechanism of the test piece, and the supporting mechanism of the test piece throws the fragments away.

[0010] Further technology of the present invention:

[0011] Preferably, the shell assembly includes an outer shell, a collection drawer and a guide groove, wherein the collection drawer is slidably nested at the bottom of the front side of the outer shell, the guide groove is opened on one side of the inner cavity of the outer shell, and the pressurizing device is fixedly arranged at the top of the inner cavity of the outer shell.

[0012] Preferably, the supporting mechanism of the test piece includes an intermediate plate, an extension plate, a supporting seat, a placement groove, a driven gear ring, a threaded sleeve and an active gear ring, wherein the intermediate plate is located in the middle part of the inner cavity of the shell, a plurality of extension plates are provided, and the plurality of extension plates are evenly fixedly arranged on the outer side of the intermediate plate and are all fixedly connected to the inner wall of the shell, the supporting seat is rotatably nested on the right side of the top of the intermediate plate through a bearing, the placement groove is opened on the top of the supporting seat, the driven gear ring is fixedly sleeved on the outer bottom of the supporting seat, the threaded sleeve is rotatably nested on the left side of the top of the intermediate plate through a bearing, and the active gear ring is fixedly sleeved on the outer bottom of the threaded sleeve and meshes with the driven gear ring.

[0013] Preferably, the bidirectional strain measuring mechanism includes a positioning plate, a positioning groove, a first inverted L-shaped plate, a guide plate, a first micrometer and a second micrometer, wherein the positioning plate is slidably arranged on the top of the support seat, the positioning groove is opened on the inner side of the positioning plate, the first inverted L-shaped plate and the guide plate are fixedly arranged on the top of the positioning plate in sequence from the outside to the inside, the first micrometer is fixedly arranged through the outside of the first inverted L-shaped plate, and the second micrometer is fixedly arranged through the top of the first inverted L-shaped plate.

[0014] Preferably, the pushing and resetting mechanism includes a first guide rod, a first return spring, a second inverted L-shaped plate, a second guide rod, a sliding block, a first push block and a second push block, wherein the first guide rod is fixedly arranged on the outer side of the first inverted L-shaped plate, the first return spring is sleeved on the outer side of the first guide rod and fixedly connected between the first inverted L-shaped plate and the second inverted L-shaped plate, the second inverted L-shaped plate is slidably sleeved on the outer side of the first guide rod and fixedly connected to the supporting seat, the second guide rod is fixedly arranged on the top of the second inverted L-shaped plate, the sliding block is slidably sleeved on the outer side of the second guide rod along the vertical direction, the first push block is fixedly arranged on the inner end of the sliding block, the second push block slidably fits on the inner side of the first push block and is fixedly connected to the first inverted L-shaped plate.

[0015] Preferably, the first driving mechanism includes a reciprocating screw, a driving motor, an outer sleeve, a second return spring, an inner sleeve, an outer sleeve plate and a one-way screw, wherein the reciprocating screw passes through the top of the outer shell and extends to the inside of the outer shell and is rotatably connected to the outer shell through a bearing, the driving motor is fixedly arranged on the top of the outer shell and is transmission connected to the reciprocating screw, the outer sleeve, the second return spring and the inner sleeve are sequentially sleeved on the outside of the reciprocating screw from top to bottom, the outer sleeve is transmission connected to the reciprocating screw, the second return spring is fixedly connected between the outer sleeve and the inner sleeve, the inner sleeve is slidingly connected to the reciprocating screw and is slidably nested in the inner side of the outer sleeve in a vertical direction, the outer sleeve plate is fixedly sleeved on the bottom of the outer side of the outer sleeve and is slidably arranged on the inner side of the guide groove in a vertical direction, and the one-way screw is fixedly arranged on the bottom of the outer sleeve plate.

[0016] Preferably, the second driving mechanism includes an end plate, a connecting ring and a movable ring, wherein the end plate is fixedly arranged at the bottom end of the inner sleeve, the connecting ring is fixedly arranged at the right side of the end plate, the movable ring is rotatably arranged at the bottom of the connecting ring through a bearing, and the bottom of the movable ring is in contact with the top of the first push block.

[0017] Preferably, the test method specifically comprises the following steps:

[0018] S1. Place the test piece of standard diameter and standard height on the inner side of the placement groove, and place the cushion block on the top of the test piece, start the driving motor, and drive the reciprocating screw to rotate after the driving motor is started. When the reciprocating screw rotates, it drives the outer sleeve guided by the outer sleeve plate to move continuously downward. When the outer sleeve moves downward, the inner sleeve is driven downward by the second return spring, and the one-way screw is driven downward by the outer sleeve plate. When the inner sleeve moves downward, the movable ring is driven downward by the end plate and the connecting ring. When the movable ring moves downward, the first push block is pushed. After being pushed, the first push block drives the sliding block to move downward along the second guide rod, and at the same time pushes the second push block inward. After being pushed, the second push block drives the first inverted L-shaped plate to move inward. During the inward movement of the first inverted L-shaped plate, the first guide rod, the first micrometer and the second micrometer are driven inward, and the first return spring is stretched at the same time.

[0019] S2, when the downward movement distance of the outer sleeve reaches the first threshold, the positioning groove is attached to the outside of the test piece, the head of the first micrometer contacts the side wall of the test piece, and the bottom surface of the first push block is attached to the top surface of the second inverted L-shaped plate. At this time, the first micrometer and the second micrometer both arrive at the test station. At the same time, due to the obstruction of the second inverted L-shaped plate, the first push block cannot continue to move downward. Subsequently, as the outer sleeve continues to move downward, the inner sleeve, which is also unable to move downward because of the first push block, the movable ring, the connecting ring and the end plate, compresses the second reset spring, and at the same time, the outer sleeve continues to drive the one-way screw to move downward;

[0020] S3, the pressure device drives the pressure plate at its bottom to descend until the bottom of the pressure plate contacts the top of the cushion block and the gauge head of the second micrometer, then the test piece is pressed through the cushion block, the pressure applied by the pressure device is gradually increased, and the radial strain value and the axial strain value of the test piece are measured step by step through the first micrometer and the second micrometer until the test piece is destroyed, and the final radial strain value and axial strain value are obtained, then the pressure device drives the pressure plate to move up and reset, and in the above process, the small fragments generated by the destruction of the test piece fall on the positioning plate and the top of the supporting seat under the action of gravity;

[0021] S4. When the outer sleeve moves downward to a second threshold, the bottom end of the one-way screw enters the inner side of the threaded sleeve. As the one-way screw continues to move downward, the threaded sleeve drives the active gear ring to rotate continuously. When the active gear ring rotates, it drives the support seat to rotate continuously through the driven gear ring. When the support seat rotates, it drives the bidirectional strain measurement mechanism, the push reset mechanism and the damaged specimen to rotate synchronously. Small fragments on the top of the positioning plate and the support seat are thrown outward under the action of centrifugal force and pass through the channel between the inner wall of the outer shell and the middle plate and fall into the collection drawer to be collected.

[0022] S5. When the downward movement distance of the outer sleeve reaches the third threshold, the outer sleeve moves to the bottom of the reciprocating thread outside the reciprocating screw. Subsequently, as the reciprocating screw continues to rotate, the outer sleeve moves upward and resets. During the upward movement of the outer sleeve, the support seat drives the bidirectional strain measurement mechanism, the push reset mechanism and the damaged specimen to rotate synchronously in the opposite direction, thereby performing a secondary cleaning of small fragments. During the rotation of the push reset mechanism, the movable ring continues to rotate at the bottom of the connecting ring.

[0023] S6, when the upward movement distance of the outer sleeve reaches the fourth threshold, the outer sleeve arrives at the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw, at this time, the driving motor is stopped, and then the damaged specimen is removed from the top of the placement tank;

[0024] S7. Repeat the above S1-S6 twice to obtain three sets of final radial strain values ​​and final axial strain values. Take the average value of the three sets of final radial strain values ​​and the average value of the three sets of final axial strain values, and then calculate the elastic modulus and Poisson's ratio of the rock in the sampling area of ​​the test piece based on the average value.

[0025] The beneficial effects of the present invention are:

[0026] The present invention is provided with a shell assembly, a supporting mechanism for a test piece, a bidirectional strain measuring mechanism, a pushing and resetting mechanism, a first driving mechanism, and a second driving mechanism, so that the first driving mechanism drives the second driving mechanism to move downward, and the second driving mechanism pushes the pushing and resetting mechanism during the downward movement, and the pushing and resetting mechanism drives the bidirectional strain measuring mechanism to clamp and position the test piece and prepare for the test after being pushed, and then the pressurizing device is used to pressurize the test piece step by step. In this process, the radial strain value and the axial strain value of the test piece are measured and read by the bidirectional strain measuring mechanism until the test piece is destroyed. , and then the first driving mechanism drives the support mechanism of the test piece, and the support mechanism of the test piece throws the fragments away, so that the fragments generated by the damage of the test piece are collected by the shell component. Compared with the same type of devices and methods in the prior art, the present invention can automatically complete the clamping and positioning operation of the test piece, and in this process, the first micrometer and the second micrometer arrive at the appropriate test station without manual tedious operations. In addition, after the test is completed, the fragments generated by the damage of the test piece can be cleaned and collected, avoiding the manpower consumption due to manual cleaning, and improving the overall test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a schematic cross-sectional structural diagram of the housing assembly of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the support mechanism for the test piece of the present invention.

[0031] Figure 4 It is a schematic structural diagram of the bidirectional strain measurement mechanism and the push-reset mechanism of the present invention.

[0032] Figure 5 It is a schematic structural diagram of the first driving mechanism and the second driving mechanism of the present invention.

[0033] In the figure: 1, shell assembly; 11, shell; 12, collection drawer; 13, guide groove; 2, pressurizing device; 3, support mechanism for the test piece; 31, middle plate; 32, extension plate; 33, support seat; 34, placement groove; 35, driven gear ring; 36, threaded sleeve; 37, active gear ring; 4, bidirectional strain measurement mechanism; 41, positioning plate; 42, positioning groove; 43, first inverted L-shaped plate; 44, guide plate; 45, first micrometer; 46, second micrometer; 5 , push reset mechanism; 51, first guide rod; 52, first reset spring; 53, second inverted L-shaped plate; 54, second guide rod; 55, sliding block; 56, first push block; 57, second push block; 6, first driving mechanism; 61, reciprocating screw; 62, driving motor; 63, outer sleeve; 64, second reset spring; 65, inner sleeve; 66, outer sleeve plate; 67, one-way screw; 7, second driving mechanism; 71, end plate; 72, connecting ring; 73, movable ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be further described in detail below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention but not all. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] The present invention provides Figure 1-Figure 5 The test piece supporting mechanism 3 shown in the figure includes an intermediate plate 31, an extension plate 32, a supporting seat 33, a placement groove 34, a driven gear ring 35, a threaded sleeve 36 and an active gear ring 37, wherein the intermediate plate 31 is located in the middle of the inner cavity of the shell 11, and a plurality of extension plates 32 are provided, and the plurality of extension plates 32 are evenly fixedly arranged on the outer side of the intermediate plate 31 and are fixedly connected to the inner wall of the shell 11, the supporting seat 33 is rotatably nested on the top right side of the intermediate plate 31 through a bearing, the placement groove 34 is opened at the top of the supporting seat 33, the driven gear ring 35 is fixedly sleeved on the outer bottom of the supporting seat 33, the threaded sleeve 36 is rotatably nested on the top left side of the intermediate plate 31 through a bearing, and the active gear ring 37 is fixedly sleeved on the outer bottom of the threaded sleeve 36 and meshes with the driven gear ring 35.

[0036] By setting the above structure, after the bottom end of the one-way screw 67 enters the inner side of the threaded sleeve 36, as the one-way screw 67 continues to move downward, the threaded sleeve 36 drives the active gear ring 37 to rotate continuously. When the active gear ring 37 rotates, it drives the supporting seat 33 to rotate continuously through the driven gear ring 35. When the supporting seat 33 rotates, it drives the bidirectional strain measuring mechanism 4, the pushing and resetting mechanism 5 and the damaged specimen to rotate synchronously. The small fragments on the top of the positioning plate 41 and the supporting seat 33 are thrown outward under the action of centrifugal force and pass through the channel between the inner wall of the outer shell 11 and the middle plate 31 and fall into the collecting drawer 12 to be collected. In the subsequent upward resetting process of the outer sleeve 63, the supporting seat 33 drives the bidirectional strain measuring mechanism 4, the pushing and resetting mechanism 5 and the damaged specimen to rotate synchronously in the opposite direction, thereby performing a secondary cleaning of the small fragments.

[0037] like Figure 4 As shown, the bidirectional strain measuring mechanism 4 includes a positioning plate 41, a positioning groove 42, a first inverted L-shaped plate 43, a guide plate 44, a first micrometer 45 and a second micrometer 46, wherein the positioning plate 41 is slidably arranged on the top of the supporting seat 33, the positioning groove 42 is opened on the inner side of the positioning plate 41, the first inverted L-shaped plate 43 and the guide plate 44 are fixedly arranged on the top of the positioning plate 41 from the outside to the inside, the first micrometer 45 is fixedly arranged on the outside of the first inverted L-shaped plate 43, and the second micrometer 46 is fixedly arranged on the top of the first inverted L-shaped plate 43.

[0038] like Figure 4 As shown, the pushing reset mechanism 5 includes a first guide rod 51, a first reset spring 52, a second inverted L-shaped plate 53, a second guide rod 54, a sliding block 55, a first push block 56 and a second push block 57, wherein the first guide rod 51 is fixedly arranged on the outer side of the first inverted L-shaped plate 43, the first reset spring 52 is sleeved on the outer side of the first guide rod 51 and fixedly connected between the first inverted L-shaped plate 43 and the second inverted L-shaped plate 53, the second inverted L-shaped plate 53 is slidably sleeved on the outer side of the first guide rod 51 and fixedly connected to the supporting seat 33, the second guide rod 54 is fixedly arranged on the top of the second inverted L-shaped plate 53, the sliding block 55 is slidably sleeved on the outer side of the second guide rod 54 along the vertical direction, the first push block 56 is fixedly arranged on the inner end of the sliding block 55, and the second push block 57 is slidably fitted on the inner side of the first push block 56 and fixedly connected to the first inverted L-shaped plate 43.

[0039] By setting the above-mentioned bidirectional strain measuring mechanism 4 and the pushing reset mechanism 5, the first push block 56 is pushed when the movable ring 73 moves downward. After being pushed, the first push block 56 drives the sliding block 55 to move downward along the second guide rod 54, and at the same time pushes the second push block 57 inward. After being pushed, the second push block 57 drives the first inverted L-shaped plate 43 to move inward. During the inward movement of the first inverted L-shaped plate 43, the first guide rod 51, the first micrometer 45 and the second micrometer 46 are driven inward, and the first reset spring 52 is stretched until the fixed position is reached. The positioning groove 42 is fitted on the outside of the test piece, the head of the first micrometer 45 is in contact with the side wall of the test piece, and the bottom surface of the first push block 56 is fitted with the top surface of the second inverted L-shaped plate 53. At this time, the first micrometer 45 and the second micrometer 46 both arrive at the test station. At the same time, due to the obstruction of the second inverted L-shaped plate 53, the first push block 56 cannot continue to move downward, thereby automatically completing the clamping and positioning operation of the test piece, and in the process, the first micrometer 45 and the second micrometer 46 arrive at the appropriate test station without the need for manual tedious operations.

[0040] like Figure 5 As shown, the first driving mechanism 6 includes a reciprocating screw 61, a driving motor 62, an outer sleeve 63, a second return spring 64, an inner sleeve 65, an outer sleeve plate 66 and a one-way screw 67, wherein the reciprocating screw 61 passes through the top of the housing 11 and extends to the inside of the housing 11 and is rotatably connected to the housing 11 through a bearing, the driving motor 62 is fixedly arranged on the top of the housing 11 and is transmission-connected to the reciprocating screw 61, and the outer sleeve 63, the second return spring 64 and the inner sleeve 65 are arranged from top to bottom according to the arrangement of the outer sleeve 63, the second return spring 64 and the inner sleeve 65. The second sleeve is arranged on the outside of the reciprocating screw 61, and the outer sleeve 63 is transmission-connected with the reciprocating screw 61. The second return spring 64 is fixedly connected between the outer sleeve 63 and the inner sleeve 65. The inner sleeve 65 is slidingly connected with the reciprocating screw 61 and is slidably nested on the inner side of the outer sleeve 63 along the vertical direction. The outer sleeve plate 66 is fixedly sleeved on the outer bottom of the outer side of the outer sleeve 63 and is slidably arranged on the inner side of the guide groove 13 along the vertical direction. The one-way screw 67 is fixedly arranged on the bottom of the outer sleeve plate 66.

[0041] By setting the above structure, the driving motor 62 can drive the reciprocating screw 61 to rotate after it is started. When the reciprocating screw 61 rotates, it drives the outer sleeve 63 guided by the outer sleeve plate 66 to move downward continuously. When the outer sleeve 63 moves downward, the inner sleeve 65 is driven downward by the second return spring 64, and the one-way screw 67 is driven downward by the outer sleeve plate 66.

[0042] like Figure 5As shown, the second driving mechanism 7 includes an end plate 71, a connecting ring 72 and a movable ring 73, wherein the end plate 71 is fixedly arranged at the bottom end of the inner sleeve 65, the connecting ring 72 is fixedly arranged at the right side of the end plate 71, and the movable ring 73 is rotatably arranged at the bottom of the connecting ring 72 through a bearing, and the bottom of the movable ring 73 is in contact with the top of the first push block 56.

[0043] By setting the above structure, when the inner sleeve 65 moves downward, the movable ring 73 is driven downward through the end plate 71 and the connecting ring 72. When the movable ring 73 moves downward, it pushes the first push block 56. In addition, during the subsequent rotation of the first push block 56, the movable ring 73 continues to rotate at the bottom of the connecting ring 72 driven by the first push block 56.

[0044] The present invention also discloses a rock compression test method, which is implemented using the rock compression test device mentioned above. The method specifically comprises the following steps:

[0045] S1. Place the test piece of standard diameter and standard height inside the placement groove 34, and place the cushion block on the top of the test piece, start the drive motor 62, and drive the reciprocating screw 61 to rotate after the drive motor 62 is started. When the reciprocating screw 61 rotates, it drives the outer sleeve 63 guided by the outer sleeve plate 66 to move downward continuously. When the outer sleeve 63 moves downward, it drives the inner sleeve 65 to move downward through the second return spring 64, and drives the one-way screw 67 to move downward through the outer sleeve plate 66. When the inner sleeve 65 moves downward, it drives the end The plate 71 and the connecting ring 72 drive the movable ring 73 to move downward. When the movable ring 73 moves downward, it pushes the first push block 56. After being pushed, the first push block 56 drives the sliding block 55 to move downward along the second guide rod 54, and at the same time pushes the second push block 57 inward. After being pushed, the second push block 57 drives the first inverted L-shaped plate 43 to move inward. During the inward movement of the first inverted L-shaped plate 43, it drives the first guide rod 51, the first micrometer 45 and the second micrometer 46 to move inward, and at the same time stretches the first return spring 52.

[0046] S2, when the downward movement distance of the outer sleeve 63 reaches the first threshold, the positioning groove 42 is attached to the outside of the test piece, the head of the first micrometer 45 contacts the side wall of the test piece, and the bottom surface of the first push block 56 is attached to the top surface of the second inverted L-shaped plate 53. At this time, the first micrometer 45 and the second micrometer 46 both arrive at the test station. At the same time, due to the obstruction of the second inverted L-shaped plate 53, the first push block 56 cannot continue to move downward. Subsequently, as the outer sleeve 63 continues to move downward, the inner sleeve 65, which is also unable to move downward because of the first push block 56, the movable ring 73, the connecting ring 72 and the end plate 71, compresses the second return spring 64, and at the same time, the outer sleeve 66 continues to drive the one-way screw 67 to move downward;

[0047] S3, the pressure device 2 drives the pressure plate at its bottom to descend until the bottom of the pressure plate contacts the top of the cushion block and the gauge head of the second micrometer 46, and then the test piece is pressed through the cushion block, the pressure applied by the pressure device 2 is gradually increased, and the radial strain value and the axial strain value of the test piece are measured step by step through the first micrometer 45 and the second micrometer 46 until the test piece is destroyed, and the final radial strain value and axial strain value are obtained, and then the pressure device 2 drives the pressure plate to move up and reset. In the above process, the small fragments generated by the destruction of the test piece fall on the positioning plate 41 and the top of the supporting seat 33 under the action of gravity;

[0048] S4, when the outer sleeve 63 moves downward to a second threshold, the bottom end of the one-way screw 67 enters the inner side of the threaded sleeve 36, and as the one-way screw 67 continues to move downward, the threaded sleeve 36 drives the active gear ring 37 to rotate continuously, and the active gear ring 37 drives the support seat 33 to rotate continuously through the driven gear ring 35 when rotating, and the support seat 33 drives the bidirectional strain measurement mechanism 4, the push reset mechanism 5 and the damaged specimen to rotate synchronously when rotating, and the small fragments of the positioning plate 41 and the top of the support seat 33 are thrown outward under the action of centrifugal force and pass through the channel between the inner wall of the outer shell 11 and the middle plate 31 and fall into the collection drawer 12 to be collected;

[0049] S5, when the downward movement distance of the outer sleeve 63 reaches the third threshold, the outer sleeve 63 moves to the bottom of the reciprocating thread on the outer side of the reciprocating screw 61, and then as the reciprocating screw 61 continues to rotate, the outer sleeve 63 moves upward and resets. During the upward movement of the outer sleeve 63, the support seat 33 drives the bidirectional strain measurement mechanism 4, the push reset mechanism 5 and the damaged specimen to rotate synchronously in the opposite direction, thereby performing a secondary cleaning of small fragments. During the rotation of the push reset mechanism 5, the movable ring 73 continues to rotate at the bottom of the connecting ring 72;

[0050] S6, when the upward movement distance of the outer sleeve 63 reaches the fourth threshold, the outer sleeve 63 reaches the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw 61, and the driving motor 62 is stopped at this time, and then the damaged specimen is removed from the top of the placement groove 34;

[0051] S7. Repeat the above S1-S6 twice to obtain three sets of final radial strain values ​​and final axial strain values. Take the average value of the three sets of final radial strain values ​​and the average value of the three sets of final axial strain values, and then calculate the elastic modulus and Poisson's ratio of the rock in the sampling area of ​​the test piece based on the average value.

[0052] It should also be noted that the first threshold, the second threshold, the third threshold and the fourth threshold increase in sequence, and the fifth threshold, the sixth threshold and the seventh threshold increase in sequence. At the same time, the first threshold, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold and the seventh threshold are recorded for the convenience of accurately describing the actual working conditions of the scheme;

[0053] When the solution of the present application is actually produced, according to the actual specifications of the reciprocating screw 61, the first threshold value, the second threshold value, the third threshold value, the fourth threshold value, the fifth threshold value, the sixth threshold value and the seventh threshold value are all specific values.

[0054] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A rock compression test device, characterized in that: The invention comprises a shell component (1), wherein a pressurizing device (2) is arranged at the top of the inner cavity of the shell component (1), a support mechanism (3) for a test piece is arranged in the middle of the inner cavity of the shell component (1), two groups of bidirectional strain measuring mechanisms (4) are symmetrically arranged at the top of the support mechanism (3) for the test piece, and a push-reset mechanism (5) is arranged on the side away from each other of the two groups of bidirectional strain measuring mechanisms (4), a first driving mechanism (6) is arranged at the top of the inner cavity of the shell component (1), and a second driving mechanism (7) is arranged at the bottom of the first driving mechanism (6); The first driving mechanism (6) drives the second driving mechanism (7) to move downward, and the second driving mechanism (7) pushes the pushing and resetting mechanism (5) during the downward movement. After being pushed, the pushing and resetting mechanism (5) drives the bidirectional strain measuring mechanism (4) to clamp and position the test piece and prepare for the test. The first driving mechanism (6) drives the test piece supporting mechanism (3), and the test piece supporting mechanism (3) throws the fragments away.

2. A rock compression test device according to claim 1, characterized in that: The shell assembly (1) comprises an outer shell (11), a collection drawer (12) and a guide groove (13), wherein the collection drawer (12) is slidably nested at the bottom of the front side of the outer shell (11), the guide groove (13) is opened at one side of the inner cavity of the outer shell (11), and the pressurizing device (2) is fixedly arranged at the top of the inner cavity of the outer shell (11).

3. A rock compression test device according to claim 2, characterized in that: The test piece supporting mechanism (3) comprises an intermediate plate (31), an extension plate (32), a supporting seat (33), a placement groove (34), a driven gear ring (35), a threaded sleeve (36) and an active gear ring (37), wherein the intermediate plate (31) is located in the middle of the inner cavity of the housing (11), a plurality of extension plates (32) are provided, and the plurality of extension plates (32) are evenly fixedly arranged on the outer side of the intermediate plate (31) and are all fixedly connected to the inner wall of the housing (11), the supporting seat (33) is rotatably nested on the right side of the top of the intermediate plate (31) through a bearing, the placement groove (34) is opened on the top of the supporting seat (33), the driven gear ring (35) is fixedly sleeved on the outer bottom of the supporting seat (33), the threaded sleeve (36) is rotatably nested on the left side of the top of the intermediate plate (31) through a bearing, and the active gear ring (37) is fixedly sleeved on the outer bottom of the threaded sleeve (36) and meshes with the driven gear ring (35).

4. A rock compression test device according to claim 3, characterized in that: The bidirectional strain measurement mechanism (4) comprises a positioning plate (41), a positioning groove (42), a first inverted L-shaped plate (43), a guide plate (44), a first micrometer (45) and a second micrometer (46), wherein the positioning plate (41) is slidably arranged on the top of the supporting seat (33), the positioning groove (42) is opened on the inner side of the positioning plate (41), the first inverted L-shaped plate (43) and the guide plate (44) are fixedly arranged on the top of the positioning plate (41) in sequence from the outside to the inside, the first micrometer (45) is fixedly arranged through the outside of the first inverted L-shaped plate (43), and the second micrometer (46) is fixedly arranged through the top of the first inverted L-shaped plate (43).

5. A rock compression test device according to claim 4, characterized in that: The pushing and resetting mechanism (5) comprises a first guide rod (51), a first resetting spring (52), a second inverted L-shaped plate (53), a second guide rod (54), a sliding block (55), a first pushing block (56) and a second pushing block (57), wherein the first guide rod (51) is fixedly arranged on the outside of the first inverted L-shaped plate (43), the first resetting spring (52) is sleeved on the outside of the first guide rod (51) and fixedly connected between the first inverted L-shaped plate (43) and the second inverted L-shaped plate (53), The second inverted L-shaped plate (53) is slidably sleeved on the outside of the first guide rod (51) and fixedly connected to the supporting seat (33); the second guide rod (54) is fixedly arranged on the top of the second inverted L-shaped plate (53); the sliding block (55) is slidably sleeved on the outside of the second guide rod (54) in the vertical direction; the first push block (56) is fixedly arranged on the inner end of the sliding block (55); the second push block (57) is slidably fitted on the inner side of the first push block (56) and fixedly connected to the first inverted L-shaped plate (43).

6. A rock compression test device according to claim 5, characterized in that: The first driving mechanism (6) comprises a reciprocating screw (61), a driving motor (62), an outer sleeve (63), a second return spring (64), an inner sleeve (65), an outer sleeve plate (66) and a one-way screw (67), wherein the reciprocating screw (61) passes through the top of the outer shell (11) and extends into the interior of the outer shell (11) and is rotatably connected to the outer shell (11) via a bearing, the driving motor (62) is fixedly arranged at the top of the outer shell (11) and is transmission-connected to the reciprocating screw (61), the outer sleeve (63), the second return spring (64) and the inner sleeve (65) are connected by the upper The outer sleeve (63) is connected to the reciprocating screw (61) in a transmission manner, the second return spring (64) is fixedly connected between the outer sleeve (63) and the inner sleeve (65), the inner sleeve (65) is slidably connected to the reciprocating screw (61) and is slidably nested on the inner side of the outer sleeve (63) in a vertical direction, the outer sleeve plate (66) is fixedly connected to the outer bottom of the outer sleeve (63) and is slidably arranged on the inner side of the guide groove (13) in a vertical direction, and the one-way screw (67) is fixedly arranged at the bottom of the outer sleeve plate (66).

7. A rock compression test device according to claim 6, characterized in that: The second driving mechanism (7) comprises an end plate (71), a connecting ring (72) and a movable ring (73), wherein the end plate (71) is fixedly arranged at the bottom end of the inner sleeve (65), the connecting ring (72) is fixedly arranged at the right side of the end plate (71), and the movable ring (73) is rotatably arranged at the bottom of the connecting ring (72) through a bearing, and the bottom of the movable ring (73) is in contact with the top of the first push block (56).

8. A rock compression test device according to claim 7, characterized in that: The test method specifically includes the following steps: S1. Place a test piece of standard diameter and standard height inside the placement groove (34), and place a cushion block on the top of the test piece, start the drive motor (62), and after the drive motor (62) is started, it drives the reciprocating screw (61) to rotate. When the reciprocating screw (61) rotates, it drives the outer sleeve (63) guided by the outer sleeve plate (66) to continuously move downward. When the outer sleeve (63) moves downward, it drives the inner sleeve (65) to move downward through the second return spring (64), and drives the one-way screw (67) to move downward through the outer sleeve plate (66). When the inner sleeve (65) moves downward, it drives the end plate (7 1) driving the movable ring (73) to move downward with the connecting ring (72), and when the movable ring (73) moves downward, the first push block (56) is pushed, and after being pushed, the first push block (56) drives the sliding block (55) to move downward along the second guide rod (54), and at the same time pushes the second push block (57) inward, and after being pushed, the second push block (57) drives the first inverted L-shaped plate (43) to move inward, and during the inward movement of the first inverted L-shaped plate (43), the first guide rod (51), the first micrometer (45) and the second micrometer (46) are driven inward, and at the same time, the first return spring (52) is stretched; S2, when the downward movement distance of the outer sleeve (63) reaches the first threshold value, the positioning groove (42) is attached to the outside of the test piece, the head of the first micrometer (45) contacts the side wall of the test piece, and the bottom surface of the first push block (56) is attached to the top surface of the second inverted L-shaped plate (53). At this time, the first micrometer (45) and the second micrometer (46) both arrive at the test station. At the same time, due to the obstruction of the second inverted L-shaped plate (53), the first push block (56) cannot continue to move downward. Subsequently, as the outer sleeve (63) continues to move downward, the inner sleeve (65) which is also unable to move downward due to the first push block (56), the movable ring (73), the connecting ring (72) and the end plate (71) compresses the second return spring (64), and at the same time, the outer sleeve (66) continues to drive the one-way screw (67) to move downward; S3, the pressure device (2) drives the pressure plate at its bottom to descend until the bottom of the pressure plate contacts the top of the cushion block and the gauge head of the second micrometer (46), and then the cushion block is used to apply pressure to the test piece, gradually increasing the pressure applied by the pressure device (2) and measuring the radial strain value and the axial strain value of the test piece step by step through the first micrometer (45) and the second micrometer (46) until the test piece is destroyed, and the final radial strain value and axial strain value are obtained, and then the pressure device (2) drives the pressure plate to move up and reset. In the above process, small fragments generated by the destruction of the test piece fall on the positioning plate (41) and the top of the supporting seat (33) under the action of gravity; S4, when the downward movement distance of the outer sleeve (63) reaches the second threshold value, the bottom end of the one-way screw (67) enters the inner side of the threaded sleeve (36), and subsequently as the one-way screw (67) continues to move downward, the threaded sleeve (36) drives the active gear ring (37) to rotate continuously, and when the active gear ring (37) rotates, it drives the support seat (33) to rotate continuously through the driven gear ring (35), and when the support seat (33) rotates, it drives the bidirectional strain measurement mechanism (4), the push reset mechanism (5) and the damaged test piece to rotate synchronously, and small fragments on the top of the positioning plate (41) and the support seat (33) are thrown outward under the action of centrifugal force and pass through the channel between the inner wall of the outer shell (11) and the middle plate (31) and fall into the collection drawer (12) to be collected; S5, when the downward movement distance of the outer sleeve (63) reaches the third threshold value, the outer sleeve (63) moves to the bottom end of the reciprocating thread on the outer side of the reciprocating screw (61), and then as the reciprocating screw (61) continues to rotate, the outer sleeve (63) moves upward and resets. During the upward movement of the outer sleeve (63), the support seat (33) drives the bidirectional strain measurement mechanism (4), the push reset mechanism (5) and the damaged specimen to rotate synchronously in the opposite direction, thereby performing a secondary cleaning of small fragments. During the rotation of the push reset mechanism (5), the movable ring (73) continues to rotate at the bottom of the connecting ring (72); S6, when the upward movement distance of the outer sleeve (63) reaches the fourth threshold value, the outer sleeve (63) reaches the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw (61), and the driving motor (62) is stopped at this time, and then the damaged specimen is removed from the top of the placement groove (34); S7. Repeat the above S1-S6 twice to obtain three sets of final radial strain values ​​and final axial strain values. Take the average value of the three sets of final radial strain values ​​and the average value of the three sets of final axial strain values, and then calculate the elastic modulus and Poisson's ratio of the rock in the sampling area of ​​the test piece based on the average value.

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