A shale gas content measuring device

Abstract

The present invention relates to the technical field of shale gas extraction, and more specifically, to a shale gas content measuring device for detecting cylindrical rock samples. The device comprises a base, a measuring chamber mounted on the base, an axial force assembly mounted within the measuring chamber for applying pressure to both ends of the rock sample, an environmental control module for regulating the measurement temperature and pressure, at least two sets of clamps for clamping the rock sample, with a pull rope wrapped around the outer threads of the clamps. The measuring chamber also includes a clamp connector, an elastic locking mechanism, and an analysis module. The analysis module has a preset threshold distance range L. When the clamps clamp the rock sample, a contact column drives a first extrusion plate to move, a rangefinder detects a calibration distance l between the first extrusion plate and a limit bottom ring, and the analysis module compares l with the range relationship of L. If l∉L, an error signal is issued. The device can verify the accuracy of the rock sample during measurement, avoiding errors caused by insufficient rock sample processing precision, and can quickly replace clamps to accommodate rock samples of different diameters.

Description

Technical Field

[0001] The present 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 shale gas content is crucial for assessing shale gas reserves and potential. Common measurement methods include desorption, well logging, and material balance.

[0003] Chinese invention patent application number 2022102242279 discloses a shale gas content measurement device. When in use, the shale sample is placed in a positioning fixture, and the upper and lower fixtures 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; and the temperature in the inner cavity is controlled by a constant temperature component to simulate the underground environment of shale.

[0004] However, the applicant has found that the prior art has at least the following problems:

[0005] 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 results of the shale gas content, making the measurement results less accurate. At the same time, the existing technology cannot tightly clamp rock samples of different diameters, and its applicability is insufficient. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to propose 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 results of the shale gas content, making the measurement results inaccurate.

[0007] A shale gas content measurement device includes a base, a measuring chamber mounted on the base, an axial force assembly mounted within the measuring chamber for applying pressure to both ends of a rock sample; an environmental control module for regulating the measurement temperature and air pressure; and at least two sets of clamps for clamping the rock sample, with pull ropes wrapped around the outer threads of the clamps.

[0008] A clamping plate connector, connecting the clamping plate and the inner wall of the measuring chamber, comprising: a mounting tube fixedly mounted on the connecting tube, and a connecting seat fixedly mounted on the clamping plate;

[0009] The elastic locking mechanism comprises: a connecting column arranged in the installation cylinder and capable of axial sliding and circumferential rotation, with a limit pin provided at the end thereof;

[0010] A locking plate is provided on the connecting seat, and the locking plate is provided with a limiting opening for inserting a limiting pin;

[0011] The return spring and the second extrusion plate are used to lock the limit pin in the limit opening after the splint is installed; wherein, pressing down and rotating the connecting column can disengage the limit pin from the limit opening to replace splints of different specifications;

[0012] The analysis module has a preset threshold distance range L, including:

[0013] A contact post is mounted on the clamping plate and is axially movable, and is connected to the first extrusion plate; a limiting bottom ring is provided at the bottom of the connecting seat, and is provided with a distance meter;

[0014] Among them, when the clamping plate clamps the rock sample, the contact column drives the first extrusion plate to move, and the rangefinder detects the calibration distance l between the first extrusion plate and the limit bottom ring. The analysis module compares the range relationship between l and L, and issues an error signal when l∉L.

[0015] Optionally, the measuring chamber includes two groups of end tubes mounted on the base, the two groups of end tubes 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 tubes; the clamping members include connecting tubes sealed with the two groups of end tubes, and the clamping plates are detachably connected to the connecting tubes via clamping plate connectors;

[0016] Both ends of the pull rope are connected to pull rod motors, which are fixedly installed in the end tube and are used to apply pulling force along the axial direction of the rock sample to the pull rope.

[0017] Optionally, the base includes a screw seat, a screw is installed inside the screw seat, the end of the screw is powered by a screw motor, the screw motor is fixedly installed on the screw seat, a screw slide is adapted to be installed on the screw, a fixed plate is fixedly installed at the bottom of the screw seat, and two sets of end tubes are respectively installed in the screw slide and the fixed plate.

[0018] Optionally, a sealing connector 1 is connected between the end tube at the bottom and the clamping member, a sealing connector 2 is connected between the clamping members, and a sealing connector 3 is connected between the clamping member and the end tube at the top.

[0019] Optionally, the sealing connector three includes a connecting ring that is sleeved on the connection between the connecting tube and the end tube, and a limiting ring and a threaded ring are respectively provided at both ends of the connecting ring. A supporting ring is fixedly installed on the circumference of the connecting tube, and the supporting ring cooperates with the limiting ring to limit the extreme position of the connecting ring. The circumference of the end tube is provided with a thread that is compatible with the threaded ring.

[0020] Optionally, the end of the pull rope in each group of the clamping members is connected to a quick connector, and the spiral track tubes in adjacent clamping members are adapted to each other and are on the same spiral track.

[0021] Optionally, two groups of adjacent clamping members have end portions provided with positioning pins and positioning holes, respectively, for ensuring that the two groups of spiral track cylinders are located on the same spiral track.

[0022] Optionally, the positioning plate is provided with a center hole for the connecting column to move downward, the center hole is connected to an insertion hole for the limit pin to move downward, a limit opening for the limit pin to be inserted into is provided on the bottom end face of the positioning plate, an elastic cavity is provided under the positioning plate, a reset spring is installed inside the elastic cavity, and a second extrusion plate is connected to the top of the reset spring for extruding the connecting column to fix the limit pin in the limit opening.

[0023] Optionally, the bottom of the reset spring is connected to the first extrusion plate, the bottom of the first extrusion plate is connected to a contact column, the clamping plate is provided with a through hole for the contact column to pass through, the bottom of the connecting seat is provided with a limiting bottom ring for limiting the downward movement of the first extrusion plate, the limiting bottom ring is provided with a movable hole for the contact column to pass through, and a rangefinder is installed on the limiting bottom ring for monitoring the calibration distance l between the first extrusion plate and the limiting bottom ring when the clamping plate 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.

[0024] Optionally, a displacement sensor is installed on the pull rod motor to monitor the pulling distance m of the output end of the pull rod motor. 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 is less than the pulling standard distance M, it is determined that the processing diameter of the rock sample is too large, otherwise no error is reported.

[0025] 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 a measuring chamber, and then the rock sample is calibrated. If the processing size of the rock sample is accurate, the clamping plate and the rock sample are tightly fitted, the contact column is pushed back into the through hole by the rock sample, and the first extrusion plate retracts the most. At this time, there is a maximum distance between the first extrusion plate and the limiting 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 verified during measurement to avoid errors caused by insufficient processing accuracy of the rock sample.

[0026] At the same time, by pressing down the connecting column, the second extrusion plate is pressed down, the limit pin is moved out of the limit opening, and the connecting column is rotated to rotate the limit pin to a position aligned with the insertion hole. The limit pin is then moved up to separate the splint and the connecting tube. Then, splints of different specifications are installed on the connecting tube, so that rock samples of different diameters can be measured, thereby improving the diversity of samples. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 This is a schematic diagram of a shale gas content measuring device according to an embodiment of the present invention;

[0029] Figure 2 This is a partial cross-sectional view of a shale gas content measuring device according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of a shale gas content measuring device according to an embodiment of the present invention;

[0031] Figure 4 This is an exploded view of the internal structure of a shale gas content measuring device according to an embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view of a sealing connector of a shale gas content measuring device according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a shale gas content measurement device according to an embodiment of the present invention. Figure 1 ;

[0034] Figure 7 This is a schematic diagram of the structure of a shale gas content measurement device according to an embodiment of the present invention. Figure 2 ;

[0035] Figure 8 This is a schematic diagram of a clamping plate connector of a shale gas content measuring device according to an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the internal structure of a clamping plate connector of a shale gas content measuring device according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of an explosion of a splint connector of a shale gas content measuring device according to an embodiment of the present invention.

[0038] The following are marked in the figure:

[0039] 101, screw seat; 102, screw; 103, screw motor; 104, screw slide; 105, fixed plate; 201, end cylinder; 2011, end cover; 2012, cylinder; 2013, pneumatic ejector; 2014, contact plate; 2015, pull rod motor; 2016, sealing connector 1; 301, clamping member; 3011, connecting cylinder; 3012, sealing connector 2; 3013, splint connector; 3014, splint; 3015, spiral track cylinder; 3016, sealing connector 3; 3061. Connecting ring; 3062. Supporting ring; 3063. Limiting ring; 3064. Threaded ring; 3131. Mounting tube; 3132. Connecting spring; 3133. Connecting column; 3134. Limiting pin; 3135. Connecting seat; 3136. Positioning plate; 3137. Insertion hole; 3138. Limiting port; 3139. Return spring; 3140. First extrusion plate; 3141. Limiting bottom ring; 3142. Moving hole; 3143. Contact column; 3144. Second extrusion plate; 401. Pull rope. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0041] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] like Figures 1 to 10 As shown, a specific embodiment of the present invention provides a shale gas content measuring device for detecting cylindrical rock samples, comprising a base, on which two sets of end tubes 201 are mounted, the two sets of end tubes 201 being arranged opposite to each other up and down, and at least one set of clamping members 301 being mounted between the two sets of end tubes 201;

[0043] The clamping member 301 includes a connecting tube 3011 that is sealedly connected to the two groups of end tubes 201. At least two groups of clamping plates 3014 are installed inside the connecting tube 3011. The drawings of this specification take four groups as an example. The two groups of clamping plates 3014 are combined to form a clamping cylinder that is adapted to the rock sample. A spiral track tube 3015 is provided on the circumference of the clamping cylinder. A pull rope 401 is passed through the spiral track tube 3015. A clamping plate connector 3013 is connected between the clamping plates 3014 and the connecting tube 3011, which is used to move the two groups of clamping plates 3014 closer to or farther away from each other.

[0044] The two ends of the pull rope 401 are connected to a pull rod motor 2015, which is fixedly installed in the end tube 201 and is used to apply a pulling force along the axial direction of the rock sample to the pull rope 401;

[0045] A pneumatic ejector rod 2013 is also installed inside the end tube 201, and a contact plate 2014 is installed at the end of the pneumatic ejector rod 2013 for applying pressure to both ends of the rock sample.

[0046] A thermostat is also installed inside the end tube 201 for regulating temperature; an air pump is installed on the base, and the air pump is connected to an air pipe, which extends into the end tube 201 and is used to vacuum the measuring space formed by the end tube 201 and the clamping member 301.

[0047] When measuring a cylindrical rock sample, the upper end tube 201 is opened, and the rock sample is placed in the connecting tube 3011. The bottom of the rock sample is placed in the contact plate 2014 at the bottom, and the whole is placed in the two clamping plates 3014. The upper end tube 201 is then sealed and connected to the connecting tube 3011. The pull rod motor 2015 is then started. The power of the pull rod motor 2015 is controlled according to the pressure required for the simulation, so that the pull rope 401 is tightened and the pull rope 401 is spirally wound around the two sets of clamping plates 3014. On the top, the two sets of splints 3014 are locked toward the central axis, thereby squeezing the rock sample in all directions, which can reduce the uneven force caused by the deformation of the splints 3014 and improve the detection accuracy. At the same time, the two sets of pneumatic push rods 2013 apply pressure to both ends of the rock sample. At the same time, the thermostat adjusts the temperature and the air pump performs vacuum to simulate the underground environment. Among them, the thermostat and the air pump are commonly used equipment and are not specifically shown in the drawings of the specification. The pull rope 401 is made of a material with less deformation under force, such as Kevlar fiber and ultra-high molecular polyethylene fiber.

[0048] In some optional implementations, such as Figure 2As shown, the base includes a screw seat 101, a screw 102 is installed inside the screw seat 101, and the end of the screw 102 is connected to a screw motor 103. The screw motor 103 is fixedly mounted on the screw seat 101 and is used to drive the screw 102 to rotate. A screw slide 104 is adapted to be mounted on the screw 102. A fixed plate 105 is fixedly mounted on the bottom of the screw seat 101. Two sets of end tubes 201 are respectively installed in the screw slide 104 and the fixed plate 105. The screw 102 is driven to rotate by the screw motor 103, thereby driving the screw slide 104 to move and realize the up and down movement of the upper end tube 201.

[0049] In some optional specific embodiments, such as Figures 1 to 4 As shown, a sealing connector 1 2016 is connected between the bottom end tube 201 and the clamping member 301, a sealing connector 2 3012 is connected between the clamping member 301 and the clamping member 301, and a sealing connector 3016 is connected between the clamping member 301 and the top end tube 201. Sealing connectors 1 2016, 3012, and 3016 have the same structure but are installed in different positions. This allows for assembly of the clamping member 301, allowing for measurement of rock samples of varying lengths, increasing sample diversity and, consequently, improving the accuracy of measurement results.

[0050] In some optional implementations, such as Figures 1 to 5 As shown, the sealing connector 3016 includes a connecting ring 3061 that is sleeved at the connection between the connecting tube 3011 and the end tube 201. A limiting ring 3063 and a threaded ring 3064 are respectively provided at both ends of the connecting ring 3061. A retaining ring 3062 is fixedly mounted on the circumference of the connecting tube 3011. The retaining ring 3062 cooperates with the limiting ring 3063 to limit the extreme position of the connecting ring 3061. The circumference of the end tube 201 is provided with threads that match the threaded ring 3064. During use, after the end tube 201 and the connecting tube 3011 are docked, the connecting ring 3061 is rotated so that the threaded ring 3064 is screwed onto the end tube 201 and the limiting ring 3063 is pressed against the retaining ring 3062.

[0051] In some optional specific embodiments, such as Figures 1 to 4 As shown, the ends of the pull ropes 401 in each group of the clamping members 301 are connected with quick connectors, and the spiral track cylinders 3015 in adjacent clamping members 301 are adapted to each other and are on the same spiral track, thereby achieving quick connection of the pull ropes 401 in multiple clamping members 301.

[0052] In some optional specific embodiments, two groups of adjacent clamping members 301 are respectively provided with positioning pins and positioning holes at their ends, so as to ensure that the two groups of spiral track cylinders 3015 are located on the same spiral track.

[0053] In some optional specific embodiments, such as Figures 6 to 10 As shown, the splint connector 3013 includes a mounting tube 3131 fixedly mounted on the inner wall of the connecting tube 3011, a connecting column 3133 is movably mounted inside the mounting tube 3131, a connecting spring 3132 is connected between the connecting column 3133 and the mounting tube 3131, a limiting pin 3134 is connected to the peripheral side of the end of the connecting column 3133, a connecting seat 3135 is mounted on the splint 3014, a locking plate 3136 is mounted on the top of the connecting seat 3135, and a locking plate 3136 is provided on the locking plate 3136. There is a center hole for the connecting column 3133 to move downward, and the center 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 locking plate 3136. An elastic cavity is provided below the locking plate 3136, and a reset spring 3139 is installed inside the elastic cavity. The top of the reset spring 3139 is connected to a second extrusion plate 3144, which is used to squeeze the connecting column 3133 and fix the limiting pin 3134 in the limiting opening 3138. During use, the connecting column 3133 is pressed down, thereby pressing down the second extrusion plate 3144, the limit pin 3134 is removed from the limit opening 3138, and the connecting column 3133 is rotated to rotate the limit pin 3134 to a position aligned with the insertion hole 3137, and then the limit pin 3134 is moved upward to separate the splint 3014 and the connecting tube 3011, and then splints 3014 of different specifications are installed on the connecting tube 3011, so that rock samples of different diameters can be measured, thereby improving the diversity of samples.

[0054] In some optional implementations, such as Figures 6 to 10As shown, the bottom of the return spring 3139 is connected to the first extrusion plate 3140, and the bottom of the first extrusion plate 3140 is connected to the contact column 3143. A through hole is provided on the clamping plate 3014 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, and the limiting bottom ring 3141 is provided with a moving hole 3142 for the contact column 3143 to pass through. 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 an error, the test is interrupted and an error is reported. During measurement, when multiple sets 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 fit tightly, 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 fall within 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 to be less than the threshold distance L. In some equipment problems, or if the rock sample has bulges or other small conditions, it may cause the calibration distance L to be greater than the threshold distance L. Therefore, the accuracy of the rock sample can be calibrated during measurement to avoid errors caused by insufficient rock sample processing accuracy.

[0055] In some optional specific embodiments, 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 the analysis module, and the analysis module is provided with a standard pulling distance M. If the pulling distance m is less than the standard pulling distance M, the processing diameter of the rock sample is determined to be too large; otherwise, no error is reported. When the diameter of the rock sample is too large, the clamping plates 3014 cannot be closed, and the margin of the pull rope 401 will be reduced, resulting in the pulling distance m being less than the standard pulling distance M. Here, the standard pulling distance is the distance that the pull rod motor 2015 pulls the pull rope 401 when the rock sample diameter 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, eliminating the influence of rock sample processing accuracy factors on the results.

[0056] In some optional specific implementations, the end barrel 201 includes a barrel body 2012 , and the barrel body 2012 is sealed with an end cover 2011 .

[0057] The working principle of the present invention is as follows: when measuring a cylindrical rock sample, the upper end tube 201 is opened, and then the rock sample is placed in the connecting tube 3011, and the bottom of the rock sample is placed in the contact plate 2014 at the bottom, and the whole is in the two clamping plates 3014, and then the upper end tube 201 is sealed and connected with the connecting tube 3011, and then the pull rod motor 2015 is started, and the power of the pull rod motor 2015 is controlled according to the pressure required for the simulation, so that the pull rope 401 is tightened, and the pull rope 401 is spirally wound around the two sets of clamping plates 3014, and the two sets of clamping plates 3014 are locked toward the central axis, thereby squeezing the rock sample in all directions, which can reduce the uneven force caused by the deformation of the clamping plates 3014 and improve the detection accuracy. At the same time, the two sets of pneumatic push rods 2013 apply pressure to both ends of the rock sample, and the thermostat adjusts the temperature, and the air pump performs vacuum to simulate the underground environment. Among them, the thermostat and the air pump are commonly used equipment and are not specifically shown in the drawings of the specification.

[0058] 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 fall within the threshold distance L, it may be that the processing accuracy of the rock sample is not enough, and its processed diameter is too small, which will cause the calibration distance L to be less than the threshold The distance L may be smaller than the threshold distance L due to some equipment problems or bulges in the rock sample. At the same time, 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 being less than the standard pulling distance M. Here, the standard pulling distance is the distance that the pull rod motor 2015 pulls the pull rope 401 when the rock sample diameter 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, thereby eliminating the influence of the rock sample processing accuracy factor on the result.

[0059] It should also be noted that the present invention can also place the base horizontally to measure rock samples placed horizontally.

[0060] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0061] The present invention is intended 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 principles of the present invention should be included within the scope of protection 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, and an axial force component is installed in the measuring chamber for applying pressure to both ends of the rock sample; an environmental control module is used to regulate the measurement temperature and air pressure, and at least two sets of clamps (3014) for clamping the rock sample, and the outer peripheral threads of the clamps (3014) are wrapped with a pull rope (401); A splint connector (3013) connects the splint (3014) and the inner wall of the measuring chamber, comprising: a mounting tube (3131) fixedly mounted on the connecting tube (3011), and a connecting seat (3135) fixedly mounted on the splint (3014); The elastic locking mechanism comprises: a connecting column (3133) which is arranged in the installation cylinder (3131) and can slide axially and rotate circumferentially, and a limiting pin (3134) is provided at the end thereof; A locking plate (3136) is provided on the connecting seat (3135), and the locking plate (3136) is provided with a limiting opening (3138) for inserting the limiting pin (3134); The return spring (3139) and the second extrusion plate (3144) are used to lock the limit pin (3134) in the limit opening (3138) after the splint (3014) is installed. The limit pin (3134) can be disengaged from the limit opening (3138) by pressing down and rotating the connecting column (3133) to replace a splint (3014) of different specifications. The analysis module has a preset threshold distance range L, including: A contact post (3143) is mounted on the clamping plate (3014) and is axially movable. The contact post (3143) is connected to the first extrusion plate (3140). A limiting bottom ring (3141) is provided at the bottom of the connecting seat (3135) and is provided with a distance meter. When the clamping plate (3014) clamps the rock sample, the contact column (3143) drives the first extrusion plate (3140) to move, the rangefinder detects the calibration distance l between the first extrusion plate (3140) and the limit bottom ring, and 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, characterized in that: The measuring chamber comprises two groups of end tubes (201) mounted on a base, the two groups of end tubes (201) being arranged opposite to each other in an upper and lower direction, and at least one group of clamping members (301) being mounted between the two groups of end tubes (201); the clamping member (301) comprises a connecting tube (3011) sealedly connected to the two groups of end tubes (201), and a clamping plate (3014) being detachably connected to the connecting tube (3011) via a clamping plate connecting member (3013); Both ends of the pull rope (401) are connected to pull rod motors (2015), which are fixedly installed in the end tube (201) and are used to apply a pulling force along the axial direction 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 screw seat (101), a screw (102) is installed inside the screw seat (101), the end of the screw (102) is connected to a screw motor (103), the screw motor (103) is fixedly installed on the screw seat (101), a screw slide (104) is adapted to be installed on the screw (102), a fixed plate (105) is fixedly installed at the bottom of the screw seat (101), and two sets of end tubes (201) are respectively installed in the screw slide (104) and the fixed plate (105).

4. The shale gas content measuring device according to claim 2, characterized in that: A sealing connection piece 1 (2016) is connected between the end tube (201) at the bottom and the clamping piece (301), a sealing connection piece 2 (3012) is connected between the clamping piece (301) and the clamping piece (301), and a sealing connection piece 3 (3016) is connected between the clamping piece (301) and the end tube (201) at the top.

5. The shale gas content measuring device according to claim 4, characterized in that: The sealing connection part three (3016) includes a connecting ring (3061) which is sleeved at the connection between the connecting tube (3011) and the end tube (201), and a limiting ring (3063) and a threaded ring (3064) are respectively provided at both ends of the connecting ring (3061). A supporting ring (3062) is fixedly installed on the circumference of the connecting tube (3011), and the supporting ring (3062) cooperates with the limiting ring (3063) to limit the extreme position of the connecting ring (3061). The circumference of the end tube (201) is provided with a thread that is compatible with the threaded ring (3064).

6. The shale gas content measuring device according to claim 2, characterized in that: The end of the pull rope (401) in each group of the clamping members (301) is connected to a quick connector, and the spiral track cylinders (3015) in adjacent clamping members (301) are adapted to each other and are on the same spiral track.

7. The shale gas content measuring device according to claim 2, characterized in that: The ends of the two adjacent groups of clamping members (301) are respectively provided with positioning pins and positioning holes, which are used to ensure that the two groups of spiral track cylinders (3015) are located on the same spiral track.

8. The shale gas content measuring device according to claim 1, characterized in that: The locking plate (3136) is provided with a center hole for the connecting column (3133) to move downward, and the center 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 is provided on the bottom end surface of the locking plate (3136). An elastic cavity is provided below the locking plate (3136), and a return spring (3139) is installed inside the elastic cavity. The top end of the return spring (3139) is connected to a second extrusion plate (3144) for extruding the connecting column (3133) to fix the limiting pin (3134) in the limiting 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 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), and the limiting bottom ring (3141) is provided with a moving hole for the contact column (3143) to pass through. The movable hole (3142) is provided with a rangefinder installed on the limit bottom ring (3141) for monitoring the calibration distance l between the first extrusion plate (3140) and the limit bottom ring (3141) when the clamping plate (3014) clamps the rock sample. The rangefinder is electrically connected to an analysis module. A threshold distance range L is preset in the analysis module. If the calibration distance l∈threshold distance L, it is determined to be normal. If the calibration distance l∉threshold distance L, it is determined to be an error, the test is interrupted and an error is reported.

10. The shale gas content measuring device according to claim 2, characterized in that: A displacement sensor is installed on the pull rod motor (2015) for monitoring 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 is less than the pulling standard 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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