Indirect measurement device for rock expansion coefficient

Abstract

The present application provides an indirect measurement device for the rock expansion coefficient, comprising a volume measurement mechanism, a rock screening mechanism, and a rock conveying mechanism. The volume measurement mechanism comprises a measuring housing and a measuring piston provided with a scale. The rock screening mechanism comprises a screening housing and a multi-layer rock screen. The rock conveying mechanism is used to convey rock crushes in different particle size ranges. The rock volume #imgabs0# is measured by the volume measurement mechanism. After the rock to be measured is crushed, rock crushes in different particle size ranges are screened out by the rock screening mechanism. The volume #imgabs1# of the rock crushes in the particle size range is then obtained by the volume measurement mechanism. Based on the weight M0 of the rock to be measured, the weight M1 of the rock crushes in the particle size range, and the volume #imgabs2# of the rock to be measured, a theoretical volume #imgabs4# of the complete rock crushes in the particle size range is obtained based on #imgabs3#. The expansion coefficient k of the rock crushes in the particle size range is calculated based on the formula #imgabs5#. The present application is convenient to operate, simple to calculate, and has a fast measurement speed.

Description

[0001] This application is a divisional application. The application number of the original application is CN202010956990.1, the application date is 2020-09-12, and the name of the invention patent is: A device and method for indirectly measuring the rock expansion coefficient. Technical Field

[0002] The present application relates to the field of rock measurement technology, and in particular to a device for indirectly measuring rock expansion coefficient. Background Art

[0003] After mining, the immediate roof collapses and shatters. The volume of the broken rock increases compared to its bulk state, a property known as rock expansion. This expansion can be expressed as the ratio of the volume of the loose rock after crushing to the volume of the rock before crushing, a value known as the expansion coefficient.

[0004] The volume of crushed rocks is not easy to calculate, especially the expansion coefficient of crushed rocks of different particle sizes. The existing technology for measuring the expansion coefficient of crushed rocks of different particle sizes has the problems of complex calculation and inaccurate measurement. Studying the expansion properties of crushed rocks is of great significance for analyzing the laws of mining subsidence, residual settlement of the mined-out surface, and stability of the overlying rock strata in the mined-out area.

[0005] Therefore, it is necessary to understand the expansion coefficient of crushed rocks of different particle sizes in order to analyze the settlement of the overburden rock after mining, as well as the residual settlement after mining stabilizes. Summary of the Invention

[0006] In order to solve the technical problems of complex and inaccurate measurement of the expansion coefficient of crushed rocks of different particle sizes in the existing technology, the present application provides an indirect measurement device for the expansion coefficient of rock. The measuring piston and the measuring shell cooperate to measure the volume of rock and crushed rock, and at the same time, the crushed rocks of different particle sizes are screened into crushed rocks of different particle size ranges, and then the screened crushed rocks of different particle size ranges are measured separately. The expansion coefficient of crushed rock of a certain particle size can be accurately measured, and the operation is convenient, the calculation is simple, and the measurement speed is fast.

[0007] To solve the above technical problems, this application adopts the following technical solutions:

[0008] An indirect measurement device for rock expansion coefficient, comprising:

[0009] The volume measuring mechanism comprises a measuring housing with an upper opening, a measuring piston being sleeved on the upper interior of the measuring housing and movable up and down relative to the measuring housing, and a graduated scale being provided on the measuring piston for indicating the distance between the bottom end of the measuring piston and the bottom end of the interior of the measuring housing;

[0010] The rock crushing and screening mechanism comprises a screening shell with an upper opening, wherein multiple layers of rock crushing screens with successively decreasing sieve apertures are arranged in the screening shell from top to bottom, and screening chambers are formed between adjacent layers of the rock crushing screens;

[0011] The crushed rock conveying mechanism comprises a plurality of crushed rock conveying groups which are used to connect or block each screening chamber and the measuring housing in sequence.

[0012] In the above-mentioned indirect measurement device for rock expansion coefficient, a pressure sensor is provided at the bottom of the measuring piston.

[0013] In the indirect measurement device for rock expansion coefficient as described above, the internal cross-sectional area of ​​the measurement shell is equal at the top and bottom.

[0014] In the indirect measurement device for the coefficient of rock expansion as described above, the measuring shell includes a receiving seat with an upper opening and a hollow measuring tube detachably mounted on the receiving seat.

[0015] In the indirect measurement device for rock expansion coefficient as described above, the screening shell is provided with an inclined slot which is arranged at an angle for obliquely placing the rock crushing screen.

[0016] In the above-mentioned indirect measurement device for rock expansion coefficient, the rock crushing screening mechanism further includes a rock crushing vibration group provided on the rock crushing screen for providing vibration potential energy.

[0017] In the above-mentioned indirect measurement device for rock expansion coefficient, the rock crushing vibration group includes a motor, a vibrator arranged at the bottom of the rock crushing screen, and a force guide plate connected between the motor and the vibrator.

[0018] As described above, in an indirect measurement device for the rock expansion coefficient, the rock crushing conveying group includes a conveying pipe with one end connected to the bottom of the screening chamber and the other end inclined downward and connected to the interior of the measuring shell, and a rock crushing sealing valve provided on the conveying pipe for connecting or blocking. The inner diameter of the conveying pipe is larger than the sieve hole diameter of the two adjacent layers of the rock crushing screen in the screening chamber connected to it.

[0019] A method for indirectly measuring the rock expansion coefficient, using the above-mentioned rock expansion coefficient indirect measurement device, includes the following steps:

[0020] A. Place the rock to be measured whose cross-sectional area matches the cross-sectional area of ​​the inner portion of the measuring housing in the measuring housing, move the measuring piston until its bottom contacts the rock to be measured, and record the scale h of the scale. 0；

[0021] B. Take the rock to be measured out of the measuring shell and weigh it to obtain the weight M0 of the rock to be measured. Obtain the internal cross-sectional area S of the measuring shell. According to the formula , calculate the volume of the rock to be measured ;

[0022] C. Crushing the rock to be measured to obtain crushed rocks of different particle sizes, placing the crushed rocks in a crushed rock screening mechanism, and screening the crushed rocks having a particle size range between the sieve apertures of two adjacent layers of the crushed rock screens in the screening chamber through the multiple layers of the crushed rock screens;

[0023] D. Select any particle size range of crushed rock as the measurement object, and deliver the crushed rock in this particle size range into the measurement housing through the crushed rock conveying group corresponding to the screening chamber where the crushed rock in this particle size range is located. Move the measuring piston until its bottom contacts the crushed rock in this particle size range, record the scale h1, and calculate the value according to the formula , calculate the volume of crushed rock in this particle size range ;

[0024] E. Take out the crushed rock in the particle size range from the measuring shell and weigh it to obtain the weight M1 of the crushed rock in the particle size range. According to the formula , calculate the theoretical volume of complete rock crushing within this particle size range , according to the formula , and calculate the expansion coefficient k of the crushed rock in this particle size range.

[0025] As described above, the method for indirectly measuring the rock expansion coefficient, before the step D of "moving the measuring piston until its bottom contacts the rock fragments in the particle size range", also includes: moving the measuring piston to press the rock fragments in the particle size range to be flat, and resetting the measuring piston after pressing them to be flat.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The present application discloses an indirect measurement device for rock expansion coefficient, comprising a volume measurement mechanism, a rock crushing screening mechanism and a rock crushing conveying mechanism. The volume measurement mechanism comprises a measuring shell and a measuring piston sleeved in the measuring shell. A scale is provided on the outer side of the measuring piston for displaying the distance between its bottom end and the bottom end of the inner side of the measuring shell. The volume measurement mechanism is used to measure the volume of the rock before and after crushing. The rock crushing screening mechanism comprises a screening shell, a plurality of rock crushing screens with successively decreasing sieve apertures arranged in the screening shell from top to bottom, for screening out rock crushing in different particle size ranges. The rock crushing conveying mechanism comprises a plurality of rock crushing conveying groups for connecting or blocking the rock crushing screening mechanism to the volume measurement mechanism, for respectively conveying rock crushing in different particle size ranges from the rock crushing screen to the rock crushing screen. The rock is transported to the volume measuring mechanism for measurement by the selection mechanism. Compared with the existing technology, the present application measures the volume of rock and crushed rock through the cooperation of the measuring piston and the measuring shell on the volume measuring mechanism, and screens the crushed rock of different particle sizes into crushed rock of different particle size ranges through the multi-layer crushed stone screen on the crushed rock screening mechanism, and then transports the screened crushed rock of different particle size ranges to the volume measuring mechanism for measurement through the crushed rock conveying group on the crushed rock conveying mechanism. It can accurately measure the crushing expansion coefficient of crushed rock of a certain particle size, is easy to operate, simple to calculate, and has a fast measurement speed. Combined with the actual project, it can improve production efficiency and safety, provide reliable data basis for tunnel support and underground mining, and has great implementation value and social and economic benefits.

[0028] The present invention provides a method for indirectly measuring the rock expansion coefficient. First, a standard sample of rock to be measured is placed in a measuring shell, and the scale h0 is recorded by moving the measuring piston. The volume equation formula is used to calculate the rock expansion coefficient. , S is the cross-sectional area inside the measuring shell, and the volume of the rock to be measured is calculated Then weigh the weight M0 of the rock to be measured, crush the rock to be measured, and use the rock crushing screening mechanism to screen out the crushed rock with different particle size ranges. Then send the crushed rock with the particle size range to be measured into the measuring shell, move the measuring piston, record the scale h1, and use the formula , calculate the volume of crushed rock in this particle size range Then weigh the weight of the crushed rock in the particle size range M1, according to the mass ratio and volume ratio of homogeneous rock , calculate the theoretical volume of complete rock crushing within this particle size range , and finally according to the formula , the expansion coefficient k of the crushed rock in this particle size range is calculated. This measurement method can accurately measure the expansion coefficient of crushed rock of a certain particle size. It is easy to operate, simple to calculate, and has a fast measurement speed. Combined with engineering practice, it can improve production efficiency and safety, provide reliable data basis for tunnel support and underground mining, and has great implementation value and social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0030] Figure 1 It is a structural diagram of an embodiment of the present application.

[0031] Figure 2 It is a three-dimensional schematic diagram of the measuring piston 12 described in the embodiment of the present application.

[0032] Figure 3 It is a structural schematic diagram of the screening housing 21 described in the embodiment of the present application.

[0033] Figure 4 FIG. 2 is a three-dimensional schematic diagram of the rock crushing screen 22 described in the embodiment of the present application. DETAILED DESCRIPTION

[0034] See also Figures 1 to 4 , a device for indirectly measuring rock expansion coefficient, comprising:

[0035] The volume measuring mechanism 1 comprises a measuring housing 11 with an upper opening. A measuring piston 12 is mounted on the upper interior of the measuring housing 11 and is movable relative thereto. A graduated scale 120 is provided on the measuring piston 12 for indicating the distance from its bottom end to the bottom end of the interior of the measuring housing 11.

[0036] The rock crushing and screening mechanism 2 comprises a screening housing 21 with an upper opening, wherein multiple layers of rock crushing screens 22 with successively decreasing apertures are arranged in the screening housing 21, and a screening chamber 20 is formed between adjacent layers of the rock crushing screens 22;

[0037] The crushed rock conveying mechanism 3 includes a plurality of crushed rock conveying groups 31 which are sequentially used to connect or block each of the screening chambers 20 and the measuring housing 11 .

[0038] The present invention relates to an indirect measurement device for the coefficient of expansion of rock crushing, comprising a volume measurement mechanism 1, a rock crushing screening mechanism 2, and a rock crushing conveying mechanism 3. The volume measurement mechanism 1 comprises a measuring housing 11 and a measuring piston 12 sleeved in the measuring housing 11. The outer side of the measuring piston 12 is provided with a scale 120 for displaying the distance between its bottom end and the bottom end of the inner side of the measuring housing 11. The volume measurement mechanism 1 is used to measure the volume of the rock before and after crushing. The rock crushing screening mechanism 2 comprises a screening housing 21, and a plurality of rock crushing screens 22 with successively smaller sieve apertures arranged in the screening housing 21 from top to bottom for screening the rock. To select crushed rocks of different particle size ranges, the crushed rock conveying mechanism 3 includes several groups of crushed rock conveying groups 31 for connecting or blocking the crushed rock screening mechanism 2 to the volume measuring mechanism 1, and is used to transport crushed rocks of different particle size ranges from the crushed rock screening mechanism 2 to the volume measuring mechanism 1 for measurement. When in use, a homogeneous rock to be measured with a cross-sectional area that matches the internal cross-sectional area of ​​the measuring housing 11 is placed into the measuring housing 11, and after the measuring piston 12 is moved to contact the rock to be measured, the scale h0 is recorded, and the volume of the rock to be measured is calculated based on the internal cross-sectional area of ​​the measuring housing 11. The rock to be measured is taken out and weighed M0, crushed into different particle sizes, and placed in the rock screening mechanism 2. The multi-layer rock crushing screen 22 is used to screen the crushed rock into crushed rock of different particle size ranges. The crushed rock of a certain particle size range is then transported to the measuring housing 11 by the rock conveying group 31 on the rock conveying mechanism 3. The measuring piston 12 is moved to its bottom to contact the crushed rock of the particle size range to flatten the crushed rock. The scale h1 is recorded and the volume of the crushed rock of the particle size range is calculated. , take out the crushed rock in this particle size range and weigh its weight M1, according to the mass ratio and volume ratio of homogeneous rock , calculate the theoretical volume of complete rock crushing within this particle size range , according to the formula , that is, the expansion coefficient k of the crushed rock in the particle size range is obtained. Compared with the existing technology, the present application measures the volume of rock and crushed rock through the cooperation of the measuring piston 12 and the measuring housing 11 on the volume measuring mechanism 1, and screens the crushed rocks of different particle sizes into crushed rocks of different particle size ranges through the multi-layer crushed rock screen 22 on the crushed rock screening mechanism 2, and then respectively conveys the screened crushed rocks of different particle size ranges to the volume measuring mechanism 1 for measurement through the crushed rock conveying group 31 on the crushed rock conveying mechanism 3. This can accurately measure the expansion coefficient of crushed rock of a certain particle size, is easy to operate, simple to calculate, and has a fast measurement speed. Combined with engineering practice, it can improve production efficiency and safety, provide a reliable data basis for tunnel support and underground mining, and has great implementation value and social and economic benefits.

[0039] Preferably, a pressure sensor 121 is provided at the bottom of the measuring piston 12. Preferably, a pressure sensor digital output window 122 electrically connected to the pressure sensor 121 for displaying pressure data is provided on the measuring piston 12. The purpose of providing the pressure sensor 121 is to promptly stop the movement of the measuring piston 12 upon contact with the rock or rock fragments to be measured, thereby obtaining true volume data and preventing the measuring piston 12 from continuing to press down after reaching the measured object or creating a gap between the measuring piston 12 and the measured object, thereby affecting measurement accuracy. The measuring piston 12 of the present application is a hydraulic piston, which improves detection accuracy.

[0040] Preferably, the internal cross-sectional area of ​​the measuring shell 11 is uniform from top to bottom. The rock to be measured is a standard specimen in the shape of a cylinder or a cube. In the specific embodiment of the present application, the interior of the measuring shell 11 is a cylinder of uniform size, which is convenient for accurately calculating S. Of course, the measuring shell 11 can also be a square or other shape that is convenient for calculating the cross section. The present application sets the rock to be measured to match the internal cross section of the measuring shell 11, and then measures the height of the rock through the scale reaction of the measuring piston 12, and calculates the volume equation. , the volume of the rock to be measured can be quickly measured, which is convenient for the subsequent calculation of the expansion coefficient. It has the advantages of easy operation and simple calculation.

[0041] Preferably, the measuring housing 11 includes a receiving seat 112 with an open top, and a hollow measuring tube 111 detachably mounted on the receiving seat 112. The receiving seat 112 is tightly fastened to the slots of the measuring tube 111 via a plurality of clips. The receiving seat 112 is preferably made of a transparent material to facilitate internal observation. A vibration spring connected to a motor is preferably mounted on the receiving seat 112. The function of the vibration spring is to ensure that when the crushed rock to be tested falls from the crushed rock screening mechanism 2 to the bottom of the receiving seat 112, the motor and vibration spring vibrate the crushed rock until it is flat, allowing the measuring piston 12 to move onto the crushed rock and prepare to measure its volume. Most existing technologies use liquid to measure rock volume, but their disadvantage is that they cannot accurately measure the volume of piled-up crushed rocks. This is because after the rock is crushed to form crushed rocks, the crushed rocks are piled up together, and there are pores between them. The liquid will fill these pores during measurement, causing the overall volume of the crushed rocks to become smaller during measurement, and it is impossible to truly reflect the volume of the crushed rocks. The present application can avoid the problem of liquid filling pores. After the crushed rocks are vibrated to be flat or the crushed rocks are pressed flat by pressing the measuring piston 12 down, and then the measuring piston 12 is moved to the top of the crushed rocks, the measurement result is the volume between the piston 12 and the receiving seat 112, which is exactly the volume of the piled-up crushed rocks. Therefore, the present application has better accuracy.

[0042] Preferably, the screening housing 21 is provided with an inclined slot 211 for slanted placement of the rock crushing screen 22. The purpose of the inclined arrangement is to facilitate the pouring of crushed rock into the volume measurement mechanism 1. Preferably, the inclined slot 211 has an opening 2111 at its upper end and an embedded groove 2112 at its lower end. The rock crushing screen 22 is provided with an engaging portion having a width greater than the width of the opening 2111. By providing multiple layers of rock crushing screens 22 with successively smaller sieve apertures from top to bottom within the screening housing 21, rock crushing of varying particle sizes can be screened. In this embodiment, four rock crushing screens 22 are provided. Of course, multiple rock crushing screens 22 can be provided depending on usage requirements. In this embodiment, three screening chambers 20 are formed, which screen the rock crushing into rock with a particle size between the upper and lower rock crushing screens 22, facilitating separate measurement of the expansion coefficient of rock crushing within each particle size range.

[0043] Preferably, the rock crushing and screening mechanism 2 further includes a rock crushing vibration group 23 provided on the rock crushing screen 22 for providing vibration potential energy. The rock crushing vibration group 23 can provide vibration potential energy to quickly screen the rock according to different particle sizes, thereby improving efficiency.

[0044] Preferably, the rock crushing vibration group 23 includes a motor 231, a vibrator 232 disposed at the bottom of the rock crushing screen 22, and a force guide plate 233 connected between the motor 231 and the vibrator 232. The motor 231 provides power to drive the vibrator 232 to vibrate, thereby vibrating the rock crushing screen 22 and improving the screening efficiency.

[0045] Preferably, the rock crushing conveying group 31 includes a conveying pipe 311 with one end connected to the bottom of the screening chamber 20 and the other end inclined downward and connected to the interior of the measuring housing 11, as well as a rock crushing sealing valve 312 provided on the conveying pipe 311 for connecting or blocking. The inner diameter of the conveying pipe 311 is larger than the sieve aperture of the two adjacent layers of the rock crushing screen 22 in the screening chamber 20 connected thereto. In the embodiment of the present application, three rock crushing conveying groups 31 are provided, which can sequentially convey rock crushing within a specific particle size range from each screening chamber into the measuring housing 11. The present application also provides rock crushing sealing valves 311, which function as a seal. When the rock crushing is not needed to be conveyed to the volume measurement mechanism 1, the rock crushing sealing valves 311 are closed, improving the sealing performance of the device and increasing measurement accuracy. By sequentially conveying rock crushing of different particle size ranges through several rock crushing conveying groups 31, the purpose of separately measuring the rock expansion coefficient of rock crushing of different particle size ranges is achieved.

[0046] Preferably, the measuring housing 11 is provided with the vent pipe 13 to improve the fluidity of the device and increase the measurement accuracy.

[0047] A method for indirectly measuring the rock expansion coefficient, using the above-mentioned rock expansion coefficient indirect measurement device, includes the following steps:

[0048] A. Place a rock to be measured whose cross-sectional area matches the internal cross-sectional area of ​​the measuring housing 11 in the measuring housing 11. Move the measuring piston 12 until the pressure sensor outputs a signal and stop moving. At this point, the bottom of the measuring piston 12 contacts the rock to be measured, and record the scale h0 of the scale 120.

[0049] B. Take the rock to be measured out of the measuring shell 11 and weigh it to obtain the weight M0 of the rock to be measured. Calculate the internal cross-sectional area S of the measuring shell 11 by measuring the length or diameter of the bottom of the measuring shell 11. , calculate the volume of the rock to be measured ;

[0050] C. Crushing the rock to be measured to obtain crushed rocks of different particle sizes, placing the crushed rocks into the rock screening mechanism 2, and screening the crushed rocks with a particle size ranging between the sieve apertures of two adjacent layers of the rock crushing screens 22 in the screening chamber 20;

[0051] D. Select any particle size range of crushed rock as the measurement object, and deliver the crushed rock in this particle size range into the measuring housing 11 through the crushed rock conveying group 31 corresponding to the screening chamber 20 where the crushed rock in this particle size range is located. Move the measuring piston 12 until the pressure sensor reading continues to rise for a period of time. Use the measuring piston 12 to press the screened crushed rock until it is flat. Then restore the measuring piston 12 and move the piston again until the pressure sensor reading changes and stop. Record the scale h1 of the scale 120. According to the formula , calculate the volume of crushed rock in this particle size range ;

[0052] E. Take out the crushed rock in the particle size range from the measuring housing 11 and weigh it to obtain the weight M1 of the crushed rock in the particle size range. Since the density of homogeneous rocks is the same, the mass ratio and volume ratio are equal, and the formula , calculate the theoretical volume of complete rock crushing within this particle size range According to the expansion coefficient formula , and calculate the expansion coefficient k of the crushed rock in this particle size range.

[0053] The present invention provides a method for indirectly measuring the rock expansion coefficient. First, a standard sample of rock to be measured is placed in a measuring shell, and the scale h0 is recorded by moving the measuring piston. The volume equation formula is used to calculate the rock expansion coefficient. , S is the cross-sectional area inside the measuring shell, and the volume of the rock to be measured is calculated Then weigh the weight M0 of the rock to be measured, crush the rock to be measured, and use the rock crushing screening mechanism to screen out the crushed rock with different particle size ranges. Then send the crushed rock with the particle size range to be measured into the measuring shell, move the measuring piston, record the scale h1, and use the formula , calculate the volume of crushed rock in this particle size range Then weigh the weight of the crushed rock in the particle size range M1, according to the mass ratio and volume ratio of homogeneous rock , calculate the theoretical volume of complete rock crushing within this particle size range , and finally according to the formula , the expansion coefficient k of the crushed rock in this particle size range is calculated. This measurement method can accurately measure the expansion coefficient of crushed rock of a certain particle size. It is easy to operate, simple to calculate, and has a fast measurement speed. Combined with engineering practice, it can improve production efficiency and safety, provide reliable data basis for tunnel support and underground mining, and has great implementation value and social and economic benefits.

[0054] Preferably, before "moving the measuring piston 12 until its bottom contacts the rock fragments in the particle size range" in step D, the method further includes: moving the measuring piston 12 to flatten the rock fragments in the particle size range, and resetting the measuring piston 12 after the rock fragments in the particle size range are flattened. The measuring piston 12 presses the rock fragments in the particle size range downward until they are flat, and when the rock fragment volume is measured, the actual rock fragment volume can be reflected, thereby improving measurement accuracy.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for indirect measurement of rock expansion coefficient, applied to a measuring device, the measuring device comprising: The volume measuring mechanism comprises a measuring housing with an upper opening, a measuring piston being sleeved on the upper interior of the measuring housing and movable up and down relative to the measuring housing, and a graduated scale being provided on the measuring piston for indicating the distance between the bottom end of the measuring piston and the bottom end of the interior of the measuring housing; The rock crushing and screening mechanism comprises a screening shell with an upper opening, wherein multiple layers of rock crushing screens with successively decreasing sieve apertures are arranged in the screening shell from top to bottom, and screening chambers are formed between adjacent layers of rock crushing screens; The crushed rock conveying mechanism includes a plurality of crushed rock conveying groups which are used to connect or block each screening chamber and the measuring housing in sequence; The measuring housing includes a receiving seat with an upper opening, and a hollow measuring tube detachably mounted on the receiving seat. A vibration spring connected to a motor is mounted on the receiving seat. When the crushed rock to be tested falls from the rock screening mechanism to the bottom of the receiving seat, the motor and the vibration spring vibrate the crushed rock until it is flat, allowing the measuring piston to accurately measure its volume when it moves onto the crushed rock. The measurement method includes the following steps: A. Place the rock to be measured, whose cross-sectional area matches the cross-sectional area of ​​the inner portion of the measuring housing, into the measuring housing. Move the measuring piston until its bottom contacts the rock to be measured, and record the scale mark h0. B. Take the rock to be measured out of the measuring shell and weigh it to get the weight M0 of the rock to be measured. Get the internal cross-sectional area S of the measuring shell. According to the formula , calculate the volume of the rock to be measured ; C. Crushing the rock to be measured to obtain crushed rocks of different particle sizes, placing the crushed rocks into a crushed rock screening mechanism, and screening the crushed rocks with a particle size range between the sieve apertures of two adjacent layers of crushed rock screens in a screening chamber through multiple layers of crushed rock screens; D. Select any rock fragment within a particle size range as the measurement object, and deliver the rock fragment within this particle size range into the measurement housing through the rock fragment conveying assembly corresponding to the screening chamber where the rock fragment within this particle size range is located. Move the measuring piston until its bottom contacts the rock fragment within this particle size range, and record the scale mark h1. According to the formula , calculate the volume of crushed rock in this particle size range ; E. Take out the crushed rock in the particle size range from the measuring shell and weigh it to obtain the weight M1 of the crushed rock in the particle size range. According to the formula , calculate the theoretical volume of complete rock crushing within this particle size range , according to the formula , and calculate the expansion coefficient k of the crushed rock in this particle size range.

2. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: A pressure sensor is provided at the bottom of the measuring piston.

3. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: Measure the internal cross-sectional area of ​​the shell equally from top to bottom.

4. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: The screening shell is provided with an inclined slot which is arranged in an inclined manner and is used for obliquely placing the rock crushing screen.

5. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: The rock crushing and screening mechanism also includes a rock crushing vibration group arranged on the rock crushing screen for providing vibration potential energy.

6. The indirect measurement method of rock expansion coefficient according to claim 5, characterized in that: The rock crushing vibration group includes a motor, a vibrator arranged at the bottom of the rock crushing screen, and a force guide plate connected between the motor and the vibrator.

7. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: The rock crushing conveying group includes a conveying pipe with one end connected to the bottom of the screen chamber and the other end inclined downward and connected to the inside of the measuring shell, as well as a rock crushing sealing valve provided on the conveying pipe for connection or blocking. The inner diameter of the conveying pipe is larger than the sieve hole diameter of the two adjacent layers of rock crushing screen in the screen chamber connected to it.

8. The indirect measurement method of rock expansion coefficient according to claim 1, characterized in that: Before "moving the measuring piston until its bottom contacts the crushed rock in the particle size range" in step D, the method further includes: moving the measuring piston to press the crushed rock in the particle size range into a flat surface, and resetting the measuring piston after pressing the crushed rock into a flat surface.

Images