A sampling device for cement testing

Abstract

The application relates to the technical field of cement detection, and discloses a sampling device for cement detection, which comprises an open-close type sampling mechanism and a pneumatic pressure control mechanism, the inside of the pneumatic pressure control mechanism is provided with a gas driving shell fixedly installed in a component installation port and in a hollow state, a hollow sleeve capable of communicating the gas driving shell and the internal structure of a sampling hollow rod, and a piston plate arranged in the gas driving shell and capable of moving longitudinally to change the pressure direction of gas to an annular elastic gas film. The sampling device for cement detection can start the sampling work after the sampling hollow rod moves to the sampling depth, and when sampling, the sampling hollow rod moves to a deeper cement accumulation area, so that the cement is directly pressed into the inside of the sampling hollow rod, thereby improving the sampling efficiency and sampling amount; in addition, the device utilizes the rotating helical blade to provide the power required by the axial movement, so that the sampling difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of cement testing technology, specifically to a sampling device for cement testing. Background Technology

[0002] Currently, cement testing is often involved in the testing of building materials. Before cement testing, a cement sampling device is needed to take a sample. In related technologies, the cement sampling device is a sampling cylinder with a sampling groove at the top. When the staff takes a sample, they insert the sampling cylinder into the cement to be sampled. Under the action of gravity, the cement falls from the sampling groove into the sampling cylinder. Then, the staff pulls the sampling cylinder out of the cement to be sampled, and the cement sampling is completed. However, when the staff first inserts the sampling cylinder into the cement to be sampled, the shallow cement fills the sampling cylinder under the action of gravity. When the sampling cylinder reaches the deeper cement, there is less space left in the sampling cylinder, resulting in less deep cement being collected, making the cement sampling incomplete.

[0003] To this end, Chinese Patent Publication No. CN219870404U discloses a "Sampling Device for Cement Testing," the main structure of which includes a sampling cylinder, one end of which is closed and the other end is open; a sampling rod, one end of which extends into the opening of the sampling cylinder and is fixed to the inner wall of the sampling cylinder; a baffle, which is slidably connected to the sampling rod and slides close to or away from the sampling cylinder, the outer wall of the baffle being separably attached to the inner wall of the sampling cylinder; and a device for driving the baffle. The sliding drive assembly is mounted on the sampling rod and located on the side of the baffle away from the sampling cylinder. This cement testing sampling device drives the baffle to slide via the drive assembly. After the baffle blocks the opening of the sampling cylinder, the sampling cylinder is inserted into the deep cement. Next, the drive assembly drives the baffle away from the sampling cylinder, the opening of the sampling cylinder is opened, and then the sampling cylinder is pulled outward. During the outward pulling of the sampling cylinder, the deep cement enters the sampling cylinder from the opening.

[0004] In reality, when the sampling tube is inserted into dry powder cement, the accumulated cement is squeezed outwards in the sampling area. Due to the low fluidity of powder cement, when the sampling port of the sampling tube is opened, the cement above it is hollow and cannot flow into the sampling tube in a timely and large amount, resulting in a relatively low sampling volume and sampling efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sampling device for cement testing. This device initiates sampling after the hollow sampling rod reaches the sampling depth. During sampling, the hollow sampling rod moves into a deeper cement accumulation area, directly pressing the cement into the hollow sampling rod to improve sampling efficiency and sample volume. Furthermore, the device utilizes rotating helical blades to provide the power required for axial movement, reducing sampling difficulty and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sampling device for cement testing, comprising a horizontal mounting plate with handles installed on both sides, a first shaft mounting hole and a component mounting port provided in the horizontal mounting plate, a drive motor fixedly mounted on the bottom of the horizontal mounting plate via a motor mounting housing, and a first pulley fixedly mounted on the end of the drive motor rotor; and an openable sampling mechanism, which internally comprises a sampling hollow rod that is linked to the first pulley via a belt and can store cement samples, a plugging component placed in the sampling hollow rod and capable of moving along the axial direction of the sampling hollow rod, an annular elastic gas film installed at the wall thickness of the sampling hollow rod and deforming under gas pressure, and a pneumatic pressure control mechanism, which internally comprises a gas drive housing fixedly mounted in the component mounting port and having a hollow interior, a hollow sleeve capable of connecting the gas drive housing and the internal structure of the sampling hollow rod, and a piston plate placed inside the gas drive housing and changing the direction of gas pressure on the annular elastic gas film by longitudinal movement.

[0007] Preferably, the openable sampling mechanism includes a central rotating shaft. The hollow sampling rod has helical blades at its shaft body. A central rotating shaft, integrally formed with the top center of the hollow sampling rod, is installed in the center of the shaft body via a bearing inside a first shaft mounting hole. A second pulley is fixedly installed at the top of the central rotating shaft, and the second pulley and the first pulley are linked by a belt. The hollow sampling rod has a longitudinal sampling cavity with an open bottom. An annular gas compression cavity is located near the bottom opening of the longitudinal sampling cavity. A first gas flow hole is provided inside the hollow sampling rod and the central rotating shaft to connect the outer space of the central rotating shaft and the top of the annular gas compression cavity. An annular elastic gas film is embedded in the hollow sampling rod at the intersection of the annular gas compression cavity and the longitudinal sampling cavity. A plugging device capable of moving axially along the longitudinal sampling cavity is placed inside the hollow sampling rod within the longitudinal sampling cavity.

[0008] Preferably, the interior of the plugging implant is provided with a weight-reducing cavity to reduce its overall weight.

[0009] Preferably, the bottom end of the sampling hollow rod and the bottom end of the plugging insert are provided with matching conical circumferential surfaces that facilitate their downward movement in the cement. When the conical circumferential surface at the bottom end of the sampling hollow rod and the conical circumferential surface at the bottom end of the plugging insert form a complete conical surface, the middle region of the plugging insert corresponds to the region where the annular elastic air film is located.

[0010] Preferably, the pneumatic pressure control mechanism includes an externally threaded rod, the gas-driven housing has a longitudinal component movable cavity inside, the hollow sleeve has an annular gas flow cavity that is placed around the central rotating shaft by bearings and sealing rings inside, and the annular gas flow cavity is connected to one end of the first gas flow hole, the bottom end of the gas-driven housing and the outer circumferential surface of the hollow sleeve are provided with gas flow channels for connecting the longitudinal component movable cavity and the annular gas flow cavity, the top end of the gas-driven housing is provided with an internally threaded hole, the rod body of the externally threaded rod is installed in the internally threaded hole through an externally threaded structure, the bottom end of the externally threaded rod is provided with a coupling structure integral with it, and a piston plate that can move axially along the longitudinal component movable cavity is placed inside the gas-driven housing, the upper end of the piston plate is installed outside the coupling structure by bearings.

[0011] Preferably, the thread structure includes an internal thread structure disposed in an internal thread hole and an external thread structure disposed on an external thread rod body, and the internal thread structure matches the external thread structure.

[0012] Preferably, it also includes an elastically retractable pre-tensioning mechanism, which internally comprises a horizontal hollow shell fixedly installed at the bottom of the horizontal mounting plate and having a hollow interior, two inner movable plates placed inside the horizontal hollow shell and capable of moving along the axial direction of the horizontal hollow shell, two driven rollers capable of abutting against the outside of the belt and rotating with the belt, and a helical spring that causes the driven rollers to exert an elastic force on the belt.

[0013] Preferably, the elastic contraction pre-tightening mechanism includes two horizontal telescopic rods. The horizontal hollow shell is fixedly installed on the fixed base at the bottom of the horizontal mounting plate via a fixed base. The interior of the horizontal hollow shell is provided with a horizontal component movable cavity. Each end of the horizontal hollow shell is provided with a rod through hole. Inside the horizontal hollow shell, there are two inner movable plates that can move axially along the horizontal component movable cavity. One end of each inner movable plate is fixedly installed with a horizontal telescopic rod that passes through the rod through hole. A helical spring is sleeved around the rod body inside the horizontal component movable cavity. A curved connecting rod is fixedly installed at the end of the horizontal telescopic rod located outside the horizontal hollow shell. The longitudinal rod of the curved connecting rod is installed inside the driven roller via a bearing.

[0014] Preferably, the initial length of the helical spring is greater than the horizontal length of the movable cavity of the horizontal component.

[0015] Preferably, the structural shape of the perforated cross section of the rod is consistent with the structural shape of the cross section of the horizontal telescopic rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the rod match the structural dimensions of the cross section of the horizontal telescopic rod.

[0016] Compared with the prior art, the present invention provides a sampling device for cement testing, which has the following beneficial effects:

[0017] The device can start sampling after the sampling hollow rod moves to the sampling depth. During sampling, the sampling hollow rod moves into the deeper cement accumulation area, thereby pressing the cement directly into the interior of the sampling hollow rod to improve sampling efficiency and sample volume. In addition, the device uses rotating helical blades to provide the power required for axial movement to reduce sampling difficulty. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0020] Figure 3 This is a three-dimensional cross-sectional view of the open / closed sampling mechanism in this invention from a first perspective.

[0021] Figure 4 This is a three-dimensional cross-sectional view of the open / closed sampling mechanism in this invention from a second perspective.

[0022] Figure 5 This is a perspective view of the pneumatic pressure control mechanism in this invention;

[0023] Figure 6 This is a three-dimensional cross-sectional view of the pneumatic pressure control mechanism in this invention;

[0024] Figure 7 This is a perspective view of the elastic contraction pre-tightening mechanism in this invention;

[0025] Figure 8 This is a three-dimensional cross-sectional view of the elastic contraction pre-tightening mechanism in this invention.

[0026] The components include: 1. Horizontal mounting plate; 2. Hand lever; 3. No. 1 shaft mounting hole; 4. Component mounting port; 5. Motor mounting housing; 6. Drive motor; 7. No. 1 pulley; 8. Belt; 9. Opening and closing sampling mechanism; 91. Sampling hollow rod; 92. Spiral blade; 93. Central rotating shaft; 94. No. 2 pulley; 95. Longitudinal sampling chamber; 96. Annular gas compression chamber; 97. No. 1 gas flow hole; 98. Blocking internal material; 99. Weight reduction cavity; 910. Annular elastic gas film; 911. Conical circumferential surface; 10. Pneumatic pressure control mechanism. 101. Gas-driven housing; 102. Longitudinal component movable cavity; 103. Hollow sleeve; 104. Annular gas flow cavity; 105. Gas flow channel; 106. Internal threaded hole; 107. Piston plate; 108. External threaded rod; 109. Coupling structure; 11. Elastic retractable pre-tightening mechanism; 111. Horizontal hollow housing; 112. Fixed base; 113. Horizontal component movable cavity; 114. Rod through hole; 115. Inner movable plate; 116. Horizontal telescopic rod; 117. Curved connecting rod; 118. Driven roller; 119. Helical spring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 and Figure 2 A sampling device for cement testing includes a horizontal mounting plate 1 with handles 2 mounted on both sides, a first shaft mounting hole 3 and a component mounting port 4 set in the horizontal mounting plate 1, a drive motor 6 fixedly mounted on the bottom of the horizontal mounting plate 1 through a motor fixing housing 5, and a first pulley 7 fixedly mounted on the rotor end of the drive motor 6. By holding the handles 2 and then starting the drive motor 6, the device can be operated.

[0029] To implement screw-in sampling and fixed-point sampling functions, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4A closable sampling mechanism 9 is required, which includes a hollow sampling rod 91 that is linked to a first pulley 7 via a belt 8 and can store cement samples; a plugging insert 98 placed inside the hollow sampling rod 91 and capable of moving along its axial direction; and an annular elastic gas film 910 installed at the wall thickness of the hollow sampling rod 91 and deforming under gas pressure. The rotor drives the central rotating shaft 93 to rotate via the belt 8, which in turn drives the hollow sampling rod 91 to rotate. By controlling the direction of rotation of the rotor, the spiral blades 92 move downwards during rotation. At this time, the hollow sampling rod 91 will spiral into the cement accumulation. The plugging insert 98 at the bottom can prevent cement from entering the longitudinal sampling chamber 95. When the bottom of the sampling hollow rod 91 reaches the sampling depth, the annular elastic gas membrane 910 releases its locking state on the blockage inside 98, and the drive motor 6 continues to drive the sampling hollow rod 91 to rotate. The downward movement of the sampling hollow rod 91 will cause cement to enter the longitudinal sampling chamber 95. At the same time, the blockage inside 98 moves upward under the action of cement until the predetermined sampling amount is reached. This causes the annular elastic gas membrane 910 to close its inner diameter under gas pressure until it closes at the central hole. Then, the drive motor 6 can be controlled to rotate the rotor in the opposite direction. At this time, the reverse rotation of the spiral blades 92 generates an upward movement direction, thereby causing the sampling hollow rod 91 to carry the cement sample out of the cement accumulation area, realizing the complete sampling process.

[0030] For details regarding the specific structure of the open / closed sampling mechanism 9, please refer to [link / reference needed]. Figure 3 and Figure 4The sampling hollow rod 91 includes a central rotating shaft 93. A spiral blade 92 is provided on the rod body of the sampling hollow rod 91. A central rotating shaft 93, integrally formed with the top center of the sampling hollow rod 91, is installed in the middle of the shaft body via a bearing inside a first shaft mounting hole 3. A second pulley 94 is fixedly installed on the top of the central rotating shaft 93, and the second pulley 94 and the first pulley 7 are linked by a belt 8. The sampling hollow rod 91 has a longitudinal sampling cavity 95 with an open bottom. An annular gas compression cavity 96 is provided in the wall thickness near the bottom opening of the longitudinal sampling cavity 95. The sampling hollow rod 91 and the central rotating shaft 93 have internal structures for connecting the outer space of the central rotating shaft 93 and the annular gas compression cavity 96. The top gas flow hole 97; the sampling hollow rod 91 has an annular elastic gas film 910 embedded at the intersection of the annular gas compression chamber 96 and the longitudinal sampling chamber 95; the sampling hollow rod 91 has a plugging insert 98 that can move axially along the longitudinal sampling chamber 95 inside the longitudinal sampling chamber 95; the plugging insert 98 has a weight-reducing cavity 99 inside to reduce its overall mass; the bottom end of the sampling hollow rod 91 and the bottom end of the plugging insert 98 are provided with matching conical circumferential surfaces 911 that facilitate their downward movement in cement; when the conical circumferential surface 911 at the bottom end of the sampling hollow rod 91 and the conical circumferential surface 911 at the bottom end of the plugging insert 98 form a complete conical surface, the middle region of the plugging insert 98 corresponds to the region where the annular elastic gas film 910 is located.

[0031] To achieve a locking effect on the plugged internal part 98 using gas and to induce an inner diameter closing phenomenon, please refer to... Figure 1 , Figure 2 , Figure 5 and Figure 6A pneumatic pressure control mechanism 10 is required, which includes a hollow gas-driven housing 101 fixedly installed in the component mounting port 4, a hollow sleeve 103 connecting the gas-driven housing 101 and the internal structure of the sampling hollow rod 91, and a piston plate 107 placed inside the gas-driven housing 101 and moving longitudinally to change the pressure direction of the gas on the annular elastic gas film 910. Rotating the external threaded rod 108 causes the piston plate 107 to move longitudinally due to the threaded connection. When the piston plate 107 moves longitudinally, it will... This causes a change in the sealed space below the piston plate 107. When the piston plate 107 moves downward, the volume of the sealed space decreases and the gas pressure increases. Under the action of the gas pressure, the annular elastic gas membrane 910 will close its inner diameter, thereby achieving a locking effect on the blockage inside 98. When the piston plate 107 moves upward, conversely, the gas pressure decreases until a gas suction force is generated, causing the annular elastic gas membrane 910 to expand outward, thereby expanding its inner diameter and canceling the locking effect on the blockage inside 98.

[0032] For the specific structure of the pneumatic pressure control mechanism 10, please refer to [link / reference]. Figure 5 and Figure 6 The gas-driven housing 101 includes an externally threaded rod 108. The interior of the gas-driven housing 101 has a longitudinal component movable cavity 102. The interior of the hollow sleeve 103 has an annular gas flow cavity 104, which is placed around the central rotating shaft 93 via bearings and sealing rings. The annular gas flow cavity 104 is connected to one end of the first gas flow hole 97. The bottom end of the gas-driven housing 101 and the outer circumferential surface of the hollow sleeve 103 are provided with gas flow channels 105 for connecting the longitudinal component movable cavity 102 and the annular gas flow cavity 104. The top end of the gas-driven housing 101 has an internally threaded rod 108. The threaded rod 108 is installed in the internal threaded hole 106 through an external thread structure. The bottom end of the external threaded rod 108 is provided with a coupling structure 109 integral with it. The gas-driven housing 101 houses a piston plate 107 that can move axially along the longitudinal component movable cavity 102. The upper end of the piston plate 107 is mounted on the outside of the coupling structure 109 through a bearing. The thread structure includes an internal thread structure provided in the internal threaded hole 106 and an external thread structure provided on the rod body of the external threaded rod 108, and the internal thread structure matches the external thread structure.

[0033] To improve the motion transmission efficiency of belt 8, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8An elastic retractable pre-tensioning mechanism 11 is required. This mechanism includes a hollow horizontal shell 111 fixedly mounted at the bottom of the horizontal mounting plate 1, two inner movable plates 115 placed inside the hollow horizontal shell 111 and capable of axial movement along the shell 111, two driven rollers 118 that abut against the outside of the belt 8 and rotate with the belt 8, and a helical spring 119 that causes the driven rollers 118 to exert an elastic force on the belt 8. Since the helical springs 119 are in a compressed state, this elastic force is transmitted through the driven rollers 118 to the corresponding side of the belt 8, causing the belt 8 to be taut. This results in a stronger pre-tensioning effect on the first pulley 7 and the second pulley 94, thereby improving the motion transmission efficiency of the belt 8.

[0034] For details regarding the specific structure of the elastic retractable pre-tensioning mechanism 11, please refer to [link / reference]. Figure 7 and Figure 8 The system includes two horizontal telescopic rods 116. A horizontal hollow outer shell 111 is fixedly mounted on a fixed base 112 at the bottom of a horizontal mounting plate 1 via a fixed base 112. The interior of the horizontal hollow outer shell 111 contains a horizontal component movable cavity 113. Each end of the horizontal hollow outer shell 111 has a rod through-hole 114. Inside the horizontal component movable cavity 113, two inner movable plates 115 capable of axial movement along the horizontal component movable cavity 113 are placed. Each inner movable plate 115 has a horizontal telescopic rod 116 fixedly mounted at one end, passing through the rod through-hole 114. The horizontal telescopic rods 116... A helical spring 119 is sleeved around the rod body located inside the movable cavity 113 of the horizontal component. A curved connecting rod 117 is fixedly installed at one end of the horizontal telescopic rod 116 located outside the horizontal hollow shell 111. The longitudinal rod of the curved connecting rod 117 is installed inside the driven roller 118 through a bearing. The initial length of the helical spring 119 is greater than the horizontal length of the movable cavity 113 of the horizontal component. The structural shape of the cross-section of the rod body through hole 114 is consistent with the structural shape of the cross-section of the horizontal telescopic rod 116, both being polygonal structures. Furthermore, the structural dimensions of the cross-section of the rod body through hole 114 match the structural dimensions of the cross-section of the horizontal telescopic rod 116.

[0035] In use, hold the handle 2, then start the drive motor 6, and then operate the pneumatic pressure control mechanism 10 to control the rotation direction of the rotor, so that the spiral blades 92 move downwards when rotating. At this time, the sampling hollow rod 91 will spin into the cement pile. At this time, the blocking insert 98 at the bottom can prevent cement from entering the longitudinal sampling chamber 95. When the bottom end of the sampling hollow rod 91 reaches the sampling depth, the annular elastic air film 910 releases the locking state of the blocking insert 98, and the drive motor 6 continues to drive the sampling hollow rod. When rod 91 rotates, the downward-moving sampling hollow rod 91 allows cement to enter the longitudinal sampling chamber 95. At the same time, the plugging material 98 moves upward under the action of the cement until the predetermined sampling amount is reached. This causes the annular elastic gas film 910 to close its inner diameter under gas pressure until it closes at the central hole. Then, the drive motor 6 can be controlled to rotate the rotor in the opposite direction. At this time, the reverse rotation of the spiral blades 92 generates an upward motion, which causes the sampling hollow rod 91 to carry the cement sample out of the cement accumulation area, thus realizing the complete sampling process.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sampling device for cement testing, comprising a horizontal mounting plate (1) with handles (2) mounted on both sides, a first shaft mounting hole (3) and a component mounting opening (4) provided in the horizontal mounting plate (1), a drive motor (6) fixedly mounted on the bottom of the horizontal mounting plate (1) via a motor mounting housing (5), and a first pulley (7) fixedly mounted on the rotor end of the drive motor (6), characterized in that: It also includes, The openable sampling mechanism (9) is equipped with a sampling hollow rod (91) that is linked to the first pulley (7) via a belt (8) and can store cement samples, a plug (98) placed in the sampling hollow rod (91) and capable of moving along the axial direction of the sampling hollow rod (91), and an annular elastic gas film (910) installed at the wall thickness of the sampling hollow rod (91) and deformed when subjected to gas pressure. And a pneumatic pressure control mechanism (10), which is provided with a gas-driven housing (101) fixedly installed in the component mounting port (4) and hollow inside, a hollow sleeve (103) that can connect the gas-driven housing (101) and the internal structure of the sampling hollow rod (91), and a piston plate (107) placed inside the gas-driven housing (101) and changing the pressure direction of the gas on the annular elastic gas film (910) by longitudinal movement. The openable sampling mechanism (9) includes a central rotating shaft (93). A spiral blade (92) is provided on the shaft body of the sampling hollow rod (91). A central rotating shaft (93) is integrally formed with the top center of the sampling hollow rod (91). The shaft body in the middle of the central rotating shaft (93) is mounted inside the first shaft mounting hole (3) via a bearing. A second pulley (94) is fixedly mounted on the top of the central rotating shaft (93), and the second pulley (94) and the first pulley (7) are linked by a belt (8). A longitudinal sampling cavity (95) with an open bottom is provided inside the sampling hollow rod (91). An annular gas compression cavity (96) is provided on the wall thickness near the bottom opening of the longitudinal sampling cavity (95) of the sampling hollow rod (91). The interiors of the sampling hollow rod (91) and the central rotating shaft (93) are provided with a space connecting the outer space of the central rotating shaft (93) and the annular gas compression cavity. The first gas flow hole (97) at the top of the compression cavity (96) has an annular elastic gas film (910) embedded in the sampling hollow rod (91) at the junction of the annular gas compression cavity (96) and the longitudinal sampling cavity (95). The sampling hollow rod (91) has a plugging insert (98) that can move along the axial direction of the longitudinal sampling cavity (95) inside the longitudinal sampling cavity (95). The plugging insert (98) is provided with a function to reduce its overall weight. The weight-reducing cavity (99) has a bottom end of the sampling hollow rod (91) and the bottom end of the plugging insert (98) with matching conical circumferential surfaces (911) that facilitate downward movement of the insert in the cement. When the conical circumferential surface (911) at the bottom end of the sampling hollow rod (91) and the conical circumferential surface (911) at the bottom end of the plugging insert (98) form a complete conical surface, the middle region of the plugging insert (98) corresponds to the region where the annular elastic air film (910) is located.

2. The sampling device for cement testing according to claim 1, characterized in that: The pneumatic pressure control mechanism (10) includes an externally threaded rod (108). The gas-driven housing (101) has a longitudinal component movable cavity (102) inside. The hollow sleeve (103) has an annular gas flow cavity (104) inside, which is placed around the central rotating shaft (93) by bearings and sealing rings. The annular gas flow cavity (104) is connected to one end of the first gas flow hole (97). The bottom end of the gas-driven housing (101) and the outer circumferential surface of the hollow sleeve (103) are provided with a connection for connecting the longitudinal component movable cavity (102) and the annular gas flow cavity. The gas flow channel (105) of the moving cavity (104) is provided with an internal threaded hole (106) at the top of the gas driven housing (101). The rod body of the external threaded rod (108) is installed in the internal threaded hole (106) through the external thread structure. The bottom end of the external threaded rod (108) is provided with a coupling structure (109) integral with it. The piston plate (107) that can move axially along the moving cavity (102) of the longitudinal component is placed inside the gas driven housing (101). The upper end of the piston plate (107) is installed outside the coupling structure (109) through a bearing.

3. A sampling device for cement testing according to claim 2, characterized in that: The threaded structure includes an internal threaded structure disposed in an internal threaded hole (106) and an external threaded structure disposed on the rod body of an external threaded rod (108), and the internal threaded structure and the external threaded structure are matched.

4. A sampling device for cement testing according to any one of claims 1-3, characterized in that: It also includes an elastic retractable pretensioning mechanism (11), which has a horizontal hollow shell (111) fixedly installed at the bottom of the horizontal mounting plate (1) and hollow inside, two inner movable plates (115) placed inside the horizontal hollow shell (111) and capable of moving along the axial direction of the horizontal hollow shell (111), two driven rollers (118) that can abut against the outside of the belt (8) and rotate with the belt (8), and a helical spring (119) that causes the driven rollers (118) to generate an elastic force on the belt (8).

5. A sampling device for cement testing according to claim 4, characterized in that: The elastic retractable pre-tightening mechanism (11) includes two horizontal telescopic rods (116). The horizontal hollow shell (111) is fixedly installed on the fixed base (112) at the bottom of the horizontal mounting plate (1) via a fixed base (112). The interior of the horizontal hollow shell (111) is provided with a horizontal component movable cavity (113). A rod through hole (114) is provided at each end of the horizontal hollow shell (111). The horizontal hollow shell (111) has two rods that can move along the horizontal component movable cavity (113) inside the horizontal component movable cavity (113). 13) An axially moving inner movable plate (115), each inner movable plate (115) has a horizontal telescopic rod (116) fixedly installed at one end of a through rod body hole (114), the horizontal telescopic rod (116) has a helical spring (119) sleeved around the rod body located inside the horizontal component movable cavity (113), the horizontal telescopic rod (116) has a curved connecting rod (117) fixedly installed at one end located outside the horizontal hollow shell (111), the longitudinal rod body of the curved connecting rod (117) is installed inside the driven roller (118) through a bearing.

6. A sampling device for cement testing according to claim 5, characterized in that: The initial length of the helical spring (119) is greater than the horizontal length of the movable cavity (113) of the horizontal component.

7. A sampling device for cement testing according to claim 6, characterized in that: The cross-sectional shape of the rod through hole (114) is consistent with the cross-sectional shape of the horizontal telescopic rod (116), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the rod through hole (114) match the structural dimensions of the cross-sectional shape of the horizontal telescopic rod (116).

Images