Shale gas content measuring device

Abstract

The invention relates to the technical field of shale gas exploitation, in particular to a shale gas content measuring device which is used for detecting a cylindrical rock sample and comprises a base, a measuring bin is installed on the base, and an axial force application assembly is installed in the measuring bin and used for applying pressure to the two ends of the rock sample; the environment control module is used for regulating and controlling the measurement temperature and air pressure, the clamping plates are used for clamping a rock sample, pull ropes are wound around the peripheries of the clamping plates in a threaded mode, clamping plate connecting pieces, an elastic locking mechanism and an analysis module are further arranged in the measurement bin, and the analysis module is preset with a threshold distance range L. When the clamping plates clamp the rock sample, a contact column drives a first extrusion plate to move; the range finder detects the calibration distance l between the first extrusion plate and the limiting bottom ring, the analysis module compares the range relation between l and L, and when l is L, an error reporting signal is sent out. The precision of the rock sample can be verified during measurement, errors caused by insufficient rock sample machining precision are avoided, and meanwhile the clamping plates are rapidly replaced to adapt to rock samples with different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of mineral development, and in particular to a shale gas content measuring device. Background Art

[0002] Shale gas is an important unconventional natural gas resource. Accurately measuring the shale gas content is extremely important for assessing the reserves and mining potential of shale gas resources. Common measurement methods include desorption method, well logging method and material balance method.

[0003] The Chinese invention patent with application number 2022102242279 discloses a shale gas content measuring device. When in use, the shale sample is loaded into a positioning fixture, and the upper fixture and the lower fixture are clamped by a pre-tightening component to subject the shale sample to radial pressure; the shale sample is clamped by an axial pressure loading component to subject the shale sample to axial pressure; the temperature in the inner cavity is controlled by a constant temperature component to achieve environmental simulation of shale underground.

[0004] However, the applicant has found that the prior art has at least the following problems: When measuring the gas content of rock samples, there is a lack of detection of the processing diameter of the rock sample itself. If the processing size of the rock sample itself is unqualified, it will affect the measurement result of the shale gas content, making the measurement result inaccurate. At the same time, the existing technology cannot tightly clamp rock samples of different diameters, and its applicability is insufficient. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a shale gas content measuring device to solve the problem in the background technology that unqualified processing dimensions of the rock sample itself will affect the measurement result of the shale gas content, making the measurement result inaccurate.

[0006] A shale gas content measuring device comprises a base, a measuring chamber is installed on the base, an axial force applying component is installed in the measuring chamber, and is used to apply pressure to both ends of a rock sample; an environmental control module is used to control the measuring temperature and air pressure, and at least two groups of clamping plates are used to clamp the rock sample, and the outer peripheral threads of the clamping plates are wrapped with a pull rope; A clamping plate connecting member, connecting the clamping plate and the inner wall of the measuring chamber, comprises: a mounting tube fixedly mounted on the connecting tube, and a connecting seat fixedly mounted on the clamping plate; The elastic locking mechanism comprises: a connecting column which is arranged in the installation cylinder and can slide axially and rotate circumferentially, and a limiting pin is arranged at the end thereof; A positioning plate arranged on the connecting seat, the positioning plate being provided with a limiting opening for inserting a limiting pin; The return spring and the second extrusion plate are used to lock the limit pin in the limit opening after the clamping plate is installed; wherein, the limit pin can be disengaged from the limit opening by pressing down and rotating the connecting column to replace clamping plates of different specifications; An analysis module, which is preset with a threshold distance range L, includes: A contact column that can move axially and is installed on the clamping plate. The contact column is connected to a first pressing plate; a limiting bottom ring provided at the bottom of the connecting seat, on which a distance measuring instrument is provided; Wherein, when the clamping plate clamps the rock sample, the contact column drives the first pressing plate to move, the distance measuring instrument detects the calibration distance l between the first pressing plate and the limiting bottom ring, and the analysis module compares the range relationship between l and L. When l ∉ L, an error signal is sent.

[0007] Optionally, the measurement chamber includes two groups of end cylinders installed on the base, the two groups of end cylinders are arranged opposite to each other up and down, and at least one group of clamping members is installed between the two groups of end cylinders; the clamping member includes a connecting cylinder hermetically connected to the two groups of end cylinders, and the clamping plate is detachably connected to the connecting cylinder through a clamping plate connecting member; Both ends of the pulling rope are connected to a pulling rod motor, and the pulling rod motor is fixedly installed in the end cylinder for applying a pulling force along the axial direction of the rock sample to the pulling rope.

[0008] Optionally, the base includes a lead screw seat, a lead screw is installed inside the lead screw seat, the end of the lead screw is power-connected to a lead screw motor, the lead screw motor is fixedly installed on the lead screw seat, a lead screw slide plate is adaptively installed on the lead screw, and a fixing plate is fixedly installed at the bottom of the lead screw seat. The two groups of end cylinders are respectively installed in the lead screw slide plate and the fixing plate.

[0009] Optionally, a first sealing connecting member is connected between the end cylinder at the bottom and the clamping member, a second sealing connecting member is connected between the clamping members, and a third sealing connecting member is connected between the clamping member and the end cylinder at the top.

[0010] Optionally, the third sealing connecting member includes a connecting ring sleeved at the connection part of the connecting cylinder and the end cylinder. Limiting rings and threaded rings are respectively provided at both ends of the connecting ring. A resisting ring is fixedly installed on the circumferential side of the connecting cylinder, and the resisting ring cooperates with the limiting ring to limit the extreme position of the connecting ring. Threads adapted to the threaded ring are provided on the circumferential side of the end cylinder.

[0011] Optionally, a quick connector is connected to the end of the pulling rope in each group of clamping members, and the spiral track cylinders in adjacent clamping members are mutually adapted and on the same spiral track.

[0012] Optionally, positioning pins and positioning holes are respectively provided at the ends of two adjacent clamping members for determining that the two spiral track cylinders are on the same spiral track.

[0013] Optionally, a central hole for the connecting column to move down is provided on the clamping plate. The central hole is connected to an insertion hole for the limit pin to move down. A limit opening for the limit pin to be inserted into is provided on the bottom end face of the clamping plate. A elastic cavity is provided below the clamping plate, and a return spring is installed inside the elastic cavity. The top end of the return spring is connected to a second pressing plate for pressing the connecting column to fix the limit pin in the limit opening.

[0014] Optionally, the bottom of the return spring is connected to a first pressing plate. The bottom of the first pressing plate is connected to a contact post. A through hole for the contact post to pass through is provided on the clamping plate. A limit bottom ring for restricting the downward movement of the first pressing plate is provided at the bottom of the connecting seat. A moving hole for the contact post to pass through is provided on the limit bottom ring. A distance measuring instrument is installed on the limit bottom ring for monitoring the calibration distance l between the first pressing plate and the limit bottom ring when the clamping plate clamps the rock sample. The distance measuring instrument is electrically connected to an analysis module. A threshold distance range L is preset in the analysis module. If the calibration distance l ∈ the threshold distance L, it is determined to be normal. If the calibration distance l ∉ the threshold distance L, it is determined to be incorrect, the test is interrupted and an error is reported.

[0015] Optionally, a displacement sensor is installed on the pull rod motor for monitoring the pulling distance m of the output end of the pull rod motor. The displacement sensor is electrically connected to the analysis module. A pulling standard distance M is provided in the analysis module. If the pulling distance m < the pulling standard distance M, it is determined that the processing diameter of the rock sample is too large, otherwise no error is reported.

[0016] The beneficial effects of the present invention: The present invention provides a shale gas content measuring device. When measuring a cylindrical rock sample, the rock sample to be measured is installed in the measuring chamber, and then the rock sample is calibrated. If the processing dimensions of the rock sample are accurate, the clamping plate and the rock sample are closely attached, the contact post is pushed back into the through hole by the rock sample, and the first pressing plate retracts the most. At this time, there is a maximum distance between the first pressing plate and the limit bottom ring. In order to allow a certain error, a threshold distance L is set. When the calibration distance l does not belong to the threshold distance L, it may be that the processing accuracy of the rock sample is insufficient. Therefore, the accuracy of the rock sample can be calibrated during measurement to avoid errors caused by insufficient processing accuracy of the rock sample.

[0017] At the same time, by pressing down the connecting column, the second pressing plate is pressed down, the limit pin is removed from the limit opening, and the connecting column is rotated to rotate the limit pin to the position aligned with the insertion hole. Then the limit pin is lifted up so that the clamping plate and the connecting cylinder can be separated. Then clamping plates of different specifications are installed on the connecting cylinder, and thus rock samples of different diameters can be measured, improving the diversity of samples. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of a shale gas content measuring device according to an embodiment of the present invention; Figure 2 Partial cross-sectional view of a shale gas content measuring device according to an embodiment of the present invention; Figure 3 Internal structure schematic diagram of a shale gas content measuring device according to an embodiment of the present invention; Figure 4 Exploded view of the internal structure of a shale gas content measuring device according to an embodiment of the present invention; Figure 5 Cross-sectional view of a sealing connector of a shale gas content measuring device according to an embodiment of the present invention; Figure 6 Schematic structure of a clamping plate of a shale gas content measuring device according to an embodiment of the present invention Figure 1 ; Figure 7 Schematic structure of a clamping plate of a shale gas content measuring device according to an embodiment of the present invention Figure 2 ; Figure 8 Schematic diagram of a clamping plate connector of a shale gas content measuring device according to an embodiment of the present invention; Figure 9 Internal structure schematic diagram of a clamping plate connector of a shale gas content measuring device according to an embodiment of the present invention; Figure 10 Exploded schematic diagram of a clamping plate connector of a shale gas content measuring device according to an embodiment of the present invention.

[0020] The labels in the figure are: 101. Lead screw base; 102. Lead screw; 103. Lead screw motor; 104. Lead screw slide plate; 105. Fixed plate; 201. End cylinder; 2011. End cover; 2012. Cylinder body; 2013. Pneumatic ejector rod; 2014. Contact plate; 2015. Tie rod motor; 2016. Sealing connector one; 301. Clamping piece; 3011. Connecting cylinder; 3012. Sealing connector two; 3013. Clamp connector; 3014. Clamp; 3015. Spiral track cylinder; 3016. Sealing connector three; 3061. Connecting ring; 3062. Supporting ring; 3063. Limiting ring; 3064. Threaded ring; 3131. Installation cylinder; 3132. Connecting spring; 3133. Connecting column; 3134. Limit pin; 3135. Connecting seat; 3136. Positioning plate; 3137. Insertion hole; 3138. Limiting port; 3139. Return spring; 3140. First pressing plate; 3141. Limiting bottom ring; 3142. Moving hole; 3143. Contact column; 3144. Second pressing plate; 401. Pulling rope. Detailed implementation mode

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0023] As Figures 1 to 10 shown, a shale gas content measuring device provided by a specific embodiment of the present invention is used to detect cylindrical rock samples, and includes a base. Two groups of end cylinders 201 are installed on the base, and the two groups of end cylinders 201 are arranged opposite to each other up and down. At least one group of clamping pieces 301 is installed between the two groups of end cylinders 201; The clamping member 301 includes a connecting cylinder 3011 hermetically connected to two groups of end cylinders 201. At least two groups of clamping plates 3014 are installed inside the connecting cylinder 3011. In the accompanying drawings of this specification, four groups are taken as an example. Two groups of clamping plates 3014 are combined to form a clamping cylinder adapted to the rock sample. A spiral track cylinder 3015 is provided on the circumferential side of the clamping cylinder. A pulling rope 401 is threaded through the spiral track cylinder 3015. A clamping plate connecting member 3013 is connected between the clamping plate 3014 and the connecting cylinder 3011 for the two groups of clamping plates 3014 to approach or move away from each other; Both ends of the pulling rope 401 are connected to a pulling rod motor 2015. The pulling rod motor 2015 is fixedly installed in the end cylinder 201 for applying a pulling force along the axial direction of the rock sample to the pulling rope 401; An air cylinder 2013 is further installed inside the end cylinder 201. A contact plate 2014 is installed at the end of the air cylinder 2013 for applying pressure to both ends of the rock sample; A thermostat is further installed inside the end cylinder 201 for regulating the temperature; An air pump is installed on the base. The air pump is connected to an air pipe. The air pipe extends into the end cylinder 201 for evacuating the measurement space formed by the end cylinder 201 and the clamping member 301.

[0024] When measuring a cylindrical rock sample, the upper end cylinder 201 is opened, and then the rock sample is placed into the connecting cylinder 3011. The bottom of the rock sample is placed on the contact plate 2014 below, and the whole is located between the two clamping plates 3014. Then the upper end cylinder 201 is hermetically connected to the connecting cylinder 3011. Then the pulling rod motor 2015 is started. According to the pressure required by the simulation, the power of the pulling rod motor 2015 is controlled, so that the pulling rope 401 is tightened. The pulling rope 401 is spirally wound around the two groups of clamping plates 3014, locking the two groups of clamping plates 3014 towards the central axis, and then squeezing the rock sample in all directions, which can reduce the uneven force application caused by the deformation of the clamping plate 3014 and improve the detection accuracy. At the same time, the two air cylinders 2013 apply pressure to both ends of the rock sample, and the thermostat regulates the temperature, and the air pump evacuates the air, simulating the underground environment. Among them, the thermostat and the air pump are common devices and are not particularly shown in the accompanying drawings of the specification. The pulling rope 401 is made of a material with less deformation under force, such as Kevlar fiber and ultra-high molecular weight polyethylene fiber, etc.

[0025] In some optional specific embodiments, such as Figure 2As shown, the base includes a lead screw base 101. Inside the lead screw base 101, a lead screw 102 is installed. The end of the lead screw 102 is power-connected to a lead screw motor 103. The lead screw motor 103 is fixedly installed on the lead screw base 101 and is used to drive the lead screw 102 to rotate. A lead screw slide plate 104 is adaptively installed on the lead screw 102. A fixed plate 105 is fixedly installed at the bottom of the lead screw base 101. Two groups of end cylinders 201 are respectively installed in the lead screw slide plate 104 and the fixed plate 105. By driving the lead screw 102 to rotate through the lead screw motor 103, the lead screw slide plate 104 is driven to move, thereby realizing the up-and-down movement of the upper end cylinder 201.

[0026] In some optional specific embodiments, as Figures 1 to 4 shown, a first sealing connector 2016 is connected between the end cylinder 201 at the bottom and the clamping member 301. A second sealing connector 3012 is connected between the clamping members 301. A third sealing connector 3016 is connected between the clamping member 301 and the end cylinder 201 at the top. The first sealing connector 2016, the second sealing connector 3012, and the third sealing connector 3016 have the same structure but different installation positions, realizing the assembly of the clamping member 301, which can be applicable to the measurement of rock sample specimens of different lengths, improving the diversity of the specimens, and thus improving the accuracy of the measurement results.

[0027] In some optional specific implementations, as Figures 1 to 5 shown, the third sealing connector 3016 includes a connecting ring 3061 sleeved at the connection part of the connecting cylinder 3011 and the end cylinder 201. Limiting rings 3063 and threaded rings 3064 are respectively arranged at both ends of the connecting ring 3061. A resisting ring 3062 is fixedly installed on the circumferential side of the connecting cylinder 3011. The resisting ring 3062 cooperates with the limiting ring 3063 to limit the extreme position of the connecting ring 3061. Threads adapted to the threaded ring 3064 are provided on the circumferential side of the end cylinder 201. During use, after the end cylinder 201 and the connecting cylinder 3011 are docked, the connecting ring 3061 is rotated so that the threaded ring 3064 is screwed tightly on the end cylinder 201, and the limiting ring 3063 abuts tightly against the resisting ring 3062.

[0028] In some optional specific embodiments, as Figures 1 to 4 shown, the end of the pull rope 401 in each group of the clamping members 301 is connected with a quick connector. The spiral track cylinders 3015 in adjacent clamping members 301 are mutually adapted and on the same spiral track. Thus, the quick connection of the pull ropes 401 in multiple clamping members 301 is realized.

[0029] In some optional specific embodiments, a positioning pin and a positioning hole are respectively provided at the ends of two adjacent clamping members 301 for determining that the two spiral track cylinders 3015 are on the same spiral track.

[0030] In some optional specific embodiments, asFigures 6 to 10 As shown, the clamping plate connecting member 3013 includes an installation cylinder 3131 fixedly installed on the inner wall of the connecting cylinder 3011. A connecting column 3133 is movably installed inside the installation cylinder 3131. A connecting spring 3132 is connected between the connecting column 3133 and the installation cylinder 3131. A limiting pin 3134 is connected to the peripheral side of the end of the connecting column 3133. A connecting seat 3135 is installed on the clamping plate 3014. A clamping plate 3136 is installed at the top of the connecting seat 3135. A central hole for the connecting column 3133 to move downward is provided on the clamping plate 3136. The central hole is connected to an insertion hole 3137 for the limiting pin 3134 to move downward. A limiting opening 3138 for the limiting pin 3134 to be inserted into is provided on the bottom end face of the clamping plate 3136. A elastic cavity is provided below the clamping plate 3136. A return spring 3139 is installed inside the elastic cavity. The top of the return spring 3139 is connected to a second pressing plate 3144 for pressing the connecting column 3133 to fix the limiting pin 3134 in the limiting opening 3138. During use, by pressing down the connecting column 3133, the second pressing plate 3144 is pressed down, the limiting pin 3134 is removed from the limiting opening 3138, and the connecting column 3133 is rotated so that the limiting pin 3134 is rotated to a position aligned with the insertion hole 3137. Then the limiting pin 3134 is lifted upward so that the clamping plate 3014 and the connecting cylinder 3011 can be separated. Then clamping plates 3014 of different specifications are installed on the connecting cylinder 3011, and the measurement of rock samples with different diameters can be realized, improving the diversity of samples.

[0031] In some optional specific embodiments, such as Figures 6 to 10As shown, the bottom of the reset spring 3139 is connected to the first extrusion plate 3140, the bottom of the first extrusion plate 3140 is connected to the contact column 3143, the clamping plate 3014 is provided with a through hole for the contact column 3143 to pass through, the bottom of the connecting seat 3135 is provided with a limiting bottom ring 3141 for limiting the downward movement of the first extrusion plate 3140, the limiting bottom ring 3141 is provided with a moving hole 3142 for the contact column 3143 to pass through, and a rangefinder is installed on the limiting bottom ring 3141 for monitoring the calibration distance l between the first extrusion plate 3140 and the limiting bottom ring 3141 when the clamping plate 3014 clamps the rock sample. The rangefinder is electrically connected to an analysis module, and a threshold distance range L is preset in the analysis module. If the calibration distance l∈threshold distance L, it is judged to be normal. If the calibration distance l∉threshold distance L, it is judged to be wrong, the test is interrupted and an error is reported. During measurement, when multiple groups of clamps 3014 clamp the rock sample, at this time, if the processing size of the rock sample is accurate, the clamps 3014 and the rock sample are tightly fitted, the contact column 3143 is pushed back into the through hole by the rock sample, and the first extrusion plate 3140 retracts the most. At this time, there is a maximum distance between the first extrusion plate 3140 and the limiting bottom ring 3141. In order to allow a certain error, a threshold distance L is set. When the calibration distance l does not belong to the threshold distance L, it may be that the processing accuracy of the rock sample is insufficient, and its processed diameter is too small, which will cause the calibration distance L < threshold distance L. In some equipment problems, or the rock sample has a small state such as a bulge, it may cause the calibration distance L > threshold distance L. Therefore, the accuracy of the rock sample can be verified during measurement to avoid errors caused by insufficient processing accuracy of the rock sample.

[0032] In some optional specific embodiments, a displacement sensor is installed on the pull rod motor 2015 to monitor the pulling distance m of the output end of the pull rod motor 2015. The displacement sensor is electrically connected to the analysis module. The analysis module is provided with a pulling standard distance M. If the pulling distance m < the pulling standard distance M, it is determined that the processing diameter of the rock sample is too large, otherwise no error is reported. When the diameter of the rock sample is too large, the clamps 3014 cannot be closed, and the margin of the pull rope 401 will be reduced, resulting in the pulling distance m < the pulling standard distance M. Here, the pulling standard distance means that when the diameter of the rock sample is standard, the distance that the pull rod motor 2015 pulls the pull rope 401 to move, combined with the threshold distance L, can detect whether the diameter of the rock sample is too large or too small, eliminating the influence of the rock sample processing accuracy factor on the result.

[0033] In some optional specific implementations, the end tube 201 includes a cylinder body 2012 , and the cylinder body 2012 is sealedly connected to an end cover 2011 .

[0034] Working principle of the present invention: When measuring a cylindrical rock sample, the upper end cylinder 201 is opened, and then the rock sample is placed into the connecting cylinder 3011. The bottom of the rock sample is placed on the lower contact plate 2014 and is entirely located between the two clamping plates 3014. Then, the upper end cylinder 201 is hermetically connected to the connecting cylinder 3011. After that, the pull rod motor 2015 is started, and according to the pressure required by the simulation, the power of the pull rod motor 2015 is controlled, so that the pull rope 401 is tightened. The pull rope 401 is spirally wound around the two clamping plates 3014 to lock the two clamping plates 3014 towards the central axis, thereby squeezing the rock sample in all directions, which can reduce the uneven force application caused by the deformation of the clamping plates 3014 and improve the detection accuracy. At the same time, the two pneumatic ejector rods 2013 apply pressure to both ends of the rock sample, and at the same time, the thermostat regulates the temperature, and the air pump evacuates the air to simulate the underground environment. Among them, the thermostat and the air pump are common devices and are not particularly shown in the accompanying drawings of the specification.

[0035] When multiple sets of clamping plates 3014 clamp the rock sample, at this time, if the processing size of the rock sample is precise, then the clamping plates 3014 are in close contact with the rock sample, and the contact column 3143 is pushed back into the through hole by the rock sample, and the first pressing plate 3140 retracts the most. At this time, there is a maximum distance between the first pressing plate 3140 and the limiting bottom ring 3141. In order to allow a certain error to exist, a threshold distance L is set. When the calibration distance l does not belong to the threshold distance L, it may be that the processing accuracy of the rock sample is insufficient and its processed diameter is too small, which will result in the calibration distance L < the threshold distance L. In some equipment problems, or when the rock sample has small protrusions, etc., it may lead to the calibration distance L > the threshold distance L. At the same time, when the diameter of the rock sample is too large, the clamping plates 3014 cannot close, and the remaining amount of the pull rope 401 will decrease, resulting in the pulling distance m < the pulling standard distance M. Here, the pulling standard distance is the distance that the pull rod motor 2015 pulls the pull rope 401 to move when the diameter of the rock sample is standard. Combined with the threshold distance L, it can be detected whether the diameter of the rock sample is too large or too small, excluding the influence of the rock sample processing accuracy factor on the result.

[0036] In addition, it should be noted that the present invention can also place the base horizontally to measure the horizontally placed rock sample.

[0037] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features between the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0038] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A shale gas content measuring device, comprising a base, characterized in that, A measuring chamber is installed on the base. An axial force application component is installed inside the measuring chamber for applying pressure to both ends of the rock sample. An environment control module is used to regulate the measuring temperature and air pressure. There are at least two sets of clamping plates (3014) for clamping the rock sample. A pull rope (401) is wound around the outer periphery of the clamping plate (3014) in a threaded manner. A clamping plate connecting member (3013) connects the clamping plate (3014) to the inner wall of the measuring chamber, including: an installation cylinder (3131) fixedly installed on the connecting cylinder (3011), and a connecting seat (3135) fixedly installed on the clamping plate (3014). An elastic locking mechanism includes: a connecting column (3133) that can axially slide and circumferentially rotate in the installation cylinder (3131), and a limit pin (3134) is provided at its end. A clamping plate (3136) is provided on the connecting seat (3135). The clamping plate (3136) is provided with a limit opening (3138) for the limit pin (3134) to insert. A return spring (3139) and a second pressing plate (3144) are used to lock the limit pin (3134) in the limit opening (3138) after the clamping plate (3014) is installed. Among them, pressing down and rotating the connecting column (3133) can make the limit pin (3134) disengage from the limit opening (3138) to replace clamping plates (3014) of different specifications. The analysis module presets a threshold distance range L, including: A contact column (3143) that can axially move and is installed on the clamping plate (3014). The contact column (3143) is connected with a first pressing plate (3140). A limit bottom ring (3141) is provided at the bottom of the connecting seat (3135), and a distance measuring instrument is provided thereon. Among them, when the clamping plate (3014) clamps the rock sample, the contact column (3143) drives the first pressing plate (3140) to move. The distance measuring instrument detects the calibration distance l between the first pressing plate (3140) and the limit bottom ring. The analysis module compares the range relationship between l and L, and issues an error signal when l ∉ L.

2. The shale gas content measuring device according to claim 1, wherein The measuring chamber includes two sets of end cylinders (201) installed on the base. The two sets of end cylinders (201) are arranged vertically opposite to each other. At least one set of clamping members (301) is installed between the two sets of end cylinders (201). The clamping member (301) includes a connecting cylinder (3011) hermetically connected to the two sets of end cylinders (201). The clamping plate (3014) is detachably connected to the connecting cylinder (3011) through a clamping plate connecting member (3013). Both ends of the pull rope (401) are connected to a pull rod motor (2015). The pull rod motor (2015) is fixedly installed in the end cylinder (201) for applying a tensile force along the axis of the rock sample to the pull rope (401).

3. The shale gas content measuring device according to claim 1, characterized in that, The base includes a lead screw seat (101). A lead screw (102) is installed inside the lead screw seat (101). The end of the lead screw (102) is power-connected to a lead screw motor (103). The lead screw motor (103) is fixedly installed on the lead screw seat (101). A lead screw slide plate (104) is adaptively installed on the lead screw (102). A fixed plate (105) is fixedly installed at the bottom of the lead screw seat (101). The two sets of end cylinders (201) are respectively installed in the lead screw slide plate (104) and the fixed plate (105).

4. The shale gas content measuring device according to claim 2, wherein A first sealing connecting member (2016) is connected between the end cylinder (201) at the bottom and the clamping member (301), a second sealing connecting member (3012) is connected between the clamping members (301), and a third sealing connecting member (3016) is connected between the clamping member (301) and the end cylinder (201) at the top.

5. The shale gas content measuring device according to claim 4, wherein The third sealing connecting member (3016) includes a connecting ring (3061) sleeved at the connection part of the connecting cylinder (3011) and the end cylinder (201). Limit rings (3063) and threaded rings (3064) are respectively arranged at both ends of the connecting ring (3061). A resisting ring (3062) is fixedly installed on the circumferential side of the connecting cylinder (3011). The resisting ring (3062) cooperates with the limit ring (3063) to limit the extreme position of the connecting ring (3061). Threads adapted to the threaded ring (3064) are provided on the circumferential side of the end cylinder (201).

6. The shale gas content measuring device according to claim 2, wherein Quick connectors are connected to the ends of the draw ropes (401) in each clamping member (301). The spiral track cylinders (3015) in adjacent clamping members (301) are mutually adapted and on the same spiral track.

7. The shale gas content measuring device according to claim 2, wherein Positioning pins and positioning holes are respectively provided at the ends of two adjacent clamping members (301) for determining that the two spiral track cylinders (3015) are on the same spiral track.

8. The shale gas content measuring device according to claim 1, characterized in that A central hole for the connecting column (3133) to move down is provided on the clamping plate (3136). The central hole is connected to an insertion hole (3137) for the limit pin (3134) to move down. A limit opening (3138) for the limit pin (3134) to be inserted into is provided on the bottom end face of the clamping plate (3136). A elastic cavity is provided below the clamping plate (3136). A return spring (3139) is installed inside the elastic cavity. The top end of the return spring (3139) is connected to a second pressing plate (3144) for pressing the connecting column (3133) to fix the limit pin (3134) in the limit opening (3138).

9. The shale gas content measuring device according to claim 1, characterized in that, The bottom of the return spring (3139) is connected to a first pressing plate (3140). The bottom of the first pressing plate (3140) is connected to a contact column (3143). A through hole for the contact column (3143) to pass through is provided on the clamping plate (3014). A limit bottom ring (3141) for restricting the downward movement of the first pressing plate (3140) is provided at the bottom of the connecting seat (3135). A moving hole (3142) for the contact column (3143) to pass through is provided on the limit bottom ring (3141). A distance measuring instrument is installed on the limit bottom ring (3141) for monitoring the calibration distance l between the first pressing plate (3140) and the limit bottom ring (3141) when the clamping plate (3014) clamps the rock sample. The distance measuring instrument is electrically connected to an analysis module. A threshold distance range L is preset in the analysis module. If the calibration distance l ∈ the threshold distance L, it is determined to be normal. If the calibration distance l ∉ the threshold distance L, it is determined to be incorrect, the test is interrupted and an error report is made.

10. The shale gas content measuring device according to claim 2, wherein A displacement sensor is installed on the pull rod motor (2015) to monitor the pulling distance m at the output end of the pull rod motor (2015). The displacement sensor is electrically connected to an analysis module. A standard pulling distance M is set in the analysis module. If the pulling distance m < the standard pulling distance M, it is determined that the processing diameter of the rock sample is too large; otherwise, no error is reported.

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