Sampling device for cement detection

Abstract

The invention relates to the technical field of cement detection, and discloses a sampling device for cement detection, which comprises an open-close sampling mechanism and a pneumatic pressure control mechanism, a gas driving shell which is fixedly mounted in the component mounting opening and is in a hollow state, a hollow sleeve capable of communicating the gas driving shell with the internal structure of the sampling hollow rod, and a piston plate which is mounted in the gas driving shell and longitudinally moves to change the pressure direction of gas to the annular elastic gas film are arranged in the sampling hollow rod. According to the sampling device for cement detection, sampling work can be started after the sampling hollow rod moves to the sampling depth, and during sampling, the sampling hollow rod moves towards a deeper cement accumulation area, so that cement is directly pressed into the sampling hollow rod, the sampling efficiency is improved, and the sampling amount is increased; according to the device, the rotating spiral blade is used for providing power required by axial movement, so that the sampling difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cement detection, in particular to a sampling device for cement detection. Background Art

[0002] At present, when conducting inspections of building materials, cement inspection is usually involved. Before the cement is inspected, it is necessary to use a cement sampling device to sample the cement. In related technologies, the cement sampling device is a sampling cylinder with a sampling slot on the top of the sampling cylinder. When the staff samples the cement, they insert the sampling cylinder into the cement to be sampled, and the cement falls from the sampling slot into the sampling cylinder under the action of gravity. Then the staff pulls the sampling cylinder out of the cement to be sampled, and the cement sampling is completed. However, as soon as the staff inserts the sampling cylinder into the cement to be sampled, the shallow cement will be filled into the sampling cylinder under the action of gravity. After the sampling cylinder is inserted into the deep cement, there is less space left in the sampling cylinder, resulting in less deep cement collected, making the cement sampling not comprehensive enough.

[0003] To this end, the Chinese patent publication number "CN219870404U" discloses a "sampling device for cement detection", 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 toward or away from the sampling cylinder, and the outer wall of the baffle is detachably attached to the inner wall of the sampling cylinder; a baffle for driving the baffle to move the sampling rod. The driving assembly for the sliding plate is arranged on the sampling rod and is located on the side of the baffle away from the sampling cylinder. The sampling device for cement detection drives the baffle to slide through the driving assembly. When the baffle blocks the opening of the sampling cylinder, the sampling cylinder is extended into the deep cement; next, the driving assembly is used to drive 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 process of pulling the sampling cylinder outward, the deep cement enters the sampling cylinder from the opening of the sampling cylinder.

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

[0005] In response to the shortcomings of the existing technology, the present invention provides a sampling device for cement detection, which can start sampling after the sampling hollow rod moves to the sampling depth. During sampling, the sampling hollow rod moves toward a deeper cement accumulation area, thereby pressing the cement directly into the interior of the sampling hollow rod to improve the sampling efficiency and sampling volume. In addition, the device uses rotating spiral blades to provide the power required for axial movement to reduce the difficulty of sampling, thereby solving the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sampling device for cement detection, comprising a horizontal mounting plate with hand-grip rods mounted on both sides, a No. 1 shaft mounting hole and a component mounting port provided in the horizontal mounting plate, a driving motor fixedly mounted on the bottom of the horizontal mounting plate through a motor fixing housing, and a No. 1 pulley fixedly mounted on the end of the driving motor rotor, and an open-and-close sampling mechanism, wherein a sampling hollow rod is provided inside the mechanism, which is linked to the No. 1 pulley through a belt and can store cement samples, a blocking built-in object is placed in the sampling hollow rod and can move axially along the sampling hollow rod, and an annular elastic air film is installed at the wall thickness of the sampling hollow rod and produces a deformation effect when subjected to gas pressure, and a pneumatic pressure control mechanism, wherein a gas driving housing is provided inside the mechanism, which is fixedly mounted in the component mounting port and is hollow inside, a hollow sleeve that can connect the gas driving housing and the internal structure of the sampling hollow rod, and a piston plate is placed inside the gas driving housing and can change the direction of gas pressure on the annular elastic air film by moving longitudinally.

[0007] Preferably, the open and close sampling mechanism includes a central rotating shaft, a spiral blade is provided on the rod body of the sampling hollow rod, and a central rotating shaft with an integral structure therewith is provided at the center of the top of the sampling hollow rod, the shaft body in the middle of the central rotating shaft is installed inside the No. 1 shaft body mounting hole through a bearing, a No. 2 pulley is fixedly installed on the top of the central rotating shaft, and the No. 2 pulley and the No. 1 pulley are linked by a belt, a longitudinal sampling cavity with an open bottom end is provided inside the sampling hollow rod, an annular gas compression cavity is provided at the wall thickness near the bottom open end of the longitudinal sampling cavity, a No. 1 gas flow hole for connecting the outer space of the central rotating shaft and the top of the annular gas compression cavity is provided inside the sampling hollow rod and the central rotating shaft, an annular elastic air film is embedded in the sampling hollow rod at the intersection of the annular gas compression cavity and the longitudinal sampling cavity, and a blocking built-in object capable of moving axially along the longitudinal sampling cavity is placed inside the sampling hollow rod.

[0008] Preferably, a weight-reducing cavity is provided inside the plugging built-in object for reducing its overall mass.

[0009] Preferably, the bottom end of the sampling hollow rod and the bottom end of the plugging built-in are provided with conical circumferential surfaces that match each other and facilitate their downward movement in the cement. When the conical circumferential surface of the bottom end of the sampling hollow rod and the conical circumferential surface of the bottom end of the plugging built-in form a complete conical surface, the middle area of ​​the plugging built-in corresponds to the area where the annular elastic air film is located.

[0010] Preferably, the pneumatic pressure control mechanism includes an externally threaded rod, a longitudinal component active cavity is provided inside the gas drive housing, an annular gas flow cavity is provided inside the hollow sleeve and is placed on the periphery of the central rotating shaft through a bearing and a sealing ring, and the annular gas flow cavity is connected to one end of the No. 1 gas flow hole, and a gas flow channel for connecting the longitudinal component active cavity and the annular gas flow cavity is provided at the bottom end of the gas drive housing and the outer circumferential surface of the hollow sleeve, and an internally threaded hole is provided at the top end of the gas drive housing, and the rod body of the externally threaded rod is installed in the internally threaded hole through an externally threaded structure, and a connecting shaft structure integral with it is provided at the bottom end of the externally threaded rod, and a piston plate capable of axially moving along the longitudinal component active cavity is placed inside the gas drive housing, and the upper end of the piston plate is installed on the outside of the connecting shaft structure through a bearing.

[0011] Preferably, the threaded structure includes an internal threaded structure provided in the internal threaded hole and an external threaded structure provided on the rod body of the external threaded rod, and the internal threaded structure matches the external threaded structure.

[0012] Preferably, it also includes an elastically contractible pre-tensioning mechanism, which is internally provided with a horizontal hollow shell fixedly mounted on the bottom of the horizontal mounting plate and hollow inside, two inner movable plates placed inside the horizontal hollow shell and capable of moving axially along the horizontal hollow shell, two driven rollers that can abut against the outside of the belt and rotate with the belt, and a coil spring that enables the driven rollers to exert an elastic force on the belt.

[0013] Preferably, the elastically contractible pre-tensioning mechanism includes two horizontal telescopic rods, the horizontal hollow shell is fixedly mounted on a fixed base at the bottom of the horizontal mounting plate through a fixed base, a horizontal component movable cavity is provided inside the horizontal hollow shell, and a rod body through-hole is provided at each end of the horizontal hollow shell, and two inner movable plates capable of axially moving along the horizontal component movable cavity are arranged on the horizontal hollow shell inside the horizontal component movable cavity, and a horizontal telescopic rod passing through the rod body through-hole is fixedly mounted on one end of each inner movable plate, a coil spring is placed on the outer periphery of the rod body located inside the horizontal component movable cavity of the horizontal telescopic rod, and a curved connecting rod is fixedly mounted on one end of the horizontal telescopic rod located outside the horizontal hollow shell, and the longitudinal rod body of the curved connecting rod is mounted on the inside of the driven roller through a bearing.

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

[0015] Preferably, the structural shape of the cross section of the rod body through hole is consistent with the structural shape of the cross section of the horizontal telescopic rod, both of which are polygonal structures, and the structural dimensions of the cross section of the rod body through hole match the structural dimensions of the cross section of the horizontal telescopic rod.

[0016] Compared with the prior art, the present invention provides a cement testing sampling device with the following beneficial effects: The sampling work can be started after the sampling hollow rod moves to the sampling depth. During sampling, the sampling hollow rod moves toward a deeper cement accumulation area, thereby pressing the cement directly into the interior of the sampling hollow rod to improve the sampling efficiency and sampling volume. In addition, the device uses rotating spiral blades to provide the power required for axial movement to reduce the difficulty of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention; Figure 2 is a three-dimensional cross-sectional view of the present invention; Figure 3 It is a three-dimensional cross-sectional view of the openable and closed sampling mechanism of the present invention at a first viewing angle; Figure 4 is a three-dimensional cross-sectional view of the openable and closed sampling mechanism of the present invention at a second viewing angle; Figure 5 A three-dimensional diagram of the pneumatic pressure control mechanism of the present invention; Figure 6 is a three-dimensional cross-sectional view of the pneumatic pressure control mechanism of the present invention; Figure 7 It is a three-dimensional diagram of the elastic contraction pre-tightening mechanism of the present invention; Figure 8 It is a three-dimensional cross-sectional view of the elastic contraction pre-tightening mechanism of the present invention.

[0018] Wherein: 1. Horizontal mounting plate; 2. Hand grip; 3. No. 1 shaft mounting hole; 4. Component mounting port; 5. Motor mounting housing; 6. Drive motor; 7. No. 1 pulley; 8. Belt; 9. Open / close sampling mechanism; 91. Hollow sampling 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. Internal plugging object; 99. Weight-reducing cavity; 910. Annular elastic air film; 911. Conical circumferential surface; 10. Pneumatic pressure control mechanism; 101. Gas drive housing; 102. Longitudinal component movable chamber; 103. Hollow sleeve; 104. Annular gas flow chamber; 105. Gas flow channel; 106. Internal threaded hole; 107. Piston plate; 108. External threaded rod; 109. Coupling structure; 11. Elastic contraction type pre-tightening mechanism; 111. Horizontal hollow housing; 112. Fixed base; 113. Horizontal component movable chamber; 114. Rod body through hole; 115. Inner movable plate; 116. Horizontal telescopic rod; 117. Curved connecting rod; 118. Driven roller; 119. Coil spring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1 and Figure 2 A sampling device for cement testing includes a horizontal mounting plate 1 with hand grips 2 installed on both sides, a No. 1 shaft mounting hole 3 and a component mounting port 4 provided in the horizontal mounting plate 1, a driving motor 6 fixedly mounted on the bottom of the horizontal mounting plate 1 through a motor fixing housing 5, and a No. 1 pulley 7 fixedly mounted on the rotor end of the driving motor 6. The device can be operated by holding the hand grip 2 and then starting the driving motor 6.

[0021] To achieve the function of screw-in sampling and fixed-point sampling, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4, it is necessary to set up an open and close sampling mechanism 9, which is provided with a sampling hollow rod 91 that is linked with the first pulley 7 through a belt 8 and can store cement samples, a blocking built-in object 98 placed in the sampling hollow rod 91 and capable of moving axially along the sampling hollow rod 91, and an annular elastic air film 910 installed at the wall thickness of the sampling hollow rod 91 and producing a deformation effect when subjected to gas pressure. The rotor drives the central rotating shaft 93 to rotate through the belt 8, and then drives the sampling hollow rod 91 to rotate. The rotation direction of the rotor is controlled so that the spiral blade 92 generates a downward movement direction when rotating. At this time, the sampling hollow rod 91 will be screwed into the interior of the cement accumulation body. At this time, the blocking built-in object 98 at the bottom can prevent cement from entering the longitudinal sampling cavity 95. When the bottom end of the sampling hollow rod 91 reaches the sampling depth, the annular elastic air film 910 cancels the locking state of the blocking built-in object 98, and the driving motor 6 continues to drive the sampling hollow rod 91 to rotate. The downward moving sampling hollow rod 91 will allow cement to enter the longitudinal sampling cavity 95. At the same time, the blocking built-in object 98 moves upward under the action of cement until the predetermined sampling volume is reached, causing the annular elastic air film 910 to close its inner diameter due to gas pressure until the center hole is closed. The driving motor 6 can then be controlled to rotate the rotor in the opposite direction. At this time, the reverse rotation of the spiral blade 92 generates an upward movement direction, so that the sampling hollow rod 91 drives the cement sample out of the cement accumulation area, thereby realizing a complete sampling process.

[0022] For the specific structure of the open and close sampling mechanism 9, please refer to Figure 3 and Figure 4, including a central rotating shaft 93, a spiral blade 92 is provided at the rod body of the sampling hollow rod 91, and a central rotating shaft 93 of an integral structure with it is provided at the center of the top of the sampling hollow rod 91, and the shaft body in the middle of the central rotating shaft 93 is installed inside the No. 1 shaft body mounting hole 3 through a bearing, and a No. 2 pulley 94 is fixedly installed on the top of the central rotating shaft 93, and the No. 2 pulley 94 and the No. 1 pulley 7 are linked by a belt 8, and a longitudinal sampling cavity 95 with an open bottom end is provided inside the sampling hollow rod 91, and an annular gas compression cavity 96 is provided at the wall thickness near the bottom open end of the longitudinal sampling cavity 95 of the sampling hollow rod 91, and the interior of the sampling hollow rod 91 and the central rotating shaft 93 is provided with a space for connecting the outer space of the central rotating shaft 93 and the annular gas compression cavity 96 The No. 1 gas flow hole 97 at the top, the sampling hollow rod 91 is embedded with an annular elastic air film 910 at the intersection of the annular gas compression chamber 96 and the longitudinal sampling chamber 95, and the sampling hollow rod 91 is provided with a blocking built-in 98 capable of axially moving along the longitudinal sampling chamber 95 inside the longitudinal sampling chamber 95, and the blocking built-in 98 is provided with a weight-reducing cavity 99 for reducing its overall mass. The bottom ends of the sampling hollow rod 91 and the bottom ends of the blocking built-in 98 are provided with conical circumferential surfaces 911 that match each other and facilitate their downward movement 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 blocking built-in 98 form a complete conical surface, the middle area of ​​the blocking built-in 98 corresponds to the area where the annular elastic air film 910 is located.

[0023] In order to achieve the locking effect of the plugging insert 98 by gas and to close the inner diameter, please refer to Figure 1 、 Figure 2 、 Figure 5 and Figure 6, it is necessary to set up a pneumatic pressure control mechanism 10, which is provided with a gas drive housing 101 fixedly installed in the component installation port 4 and in a hollow state, a hollow sleeve 103 that can connect the gas drive housing 101 and the internal structure of the sampling hollow rod 91, and a piston plate 107 placed inside the gas drive housing 101 and changing the direction of the gas pressure on the annular elastic gas membrane 910 by longitudinal movement. The external threaded rod 108 is rotated, and the piston plate 107 is connected by the threaded structure, which causes the piston plate 107 to move longitudinally. When the piston plate 107 moves longitudinally, This causes changes in the enclosed space below the piston plate 107. When the piston plate 107 moves downward, the volume of the above-mentioned sealed space will decrease and the gas pressure will increase. Under the action of the gas pressure, the inner diameter of the annular elastic air membrane 910 will close, thereby achieving a locking effect on the blocked built-in object 98. When the piston plate 107 moves upward, on the contrary, the air pressure decreases until gas suction is generated, causing the annular elastic air membrane 910 to expand outward, which can achieve an expansion of the inner diameter, thereby canceling the locking effect on the blocked built-in object 98.

[0024] For the specific structure of the pneumatic pressure control mechanism 10, please refer to Figure 5 and Figure 6 , including an external threaded rod 108, the interior of the gas drive housing 101 is provided with a longitudinal component active cavity 102, the interior of the hollow sleeve 103 is provided with an annular gas flow cavity 104 placed on the periphery of the central rotating shaft 93 through a bearing and a sealing ring, and the annular gas flow cavity 104 is connected to one end of the No. 1 gas flow hole 97, the bottom end of the gas drive housing 101 and the outer circumferential surface of the hollow sleeve 103 are provided with a gas flow channel 105 for connecting the longitudinal component active cavity 102 and the annular gas flow cavity 104, the top of the gas drive housing 101 is provided with an internal thread The outer thread hole 106 is provided with an outer thread structure, and the rod body of the outer thread rod 108 is installed in the inner thread hole 106. The bottom end of the outer thread rod 108 is provided with a connecting shaft structure 109 with an integral structure therewith. A piston plate 107 capable of axial movement along the longitudinal component movable cavity 102 is placed inside the gas drive housing 101. The upper end of the piston plate 107 is installed on the outside of the connecting shaft structure 109 through a bearing. The threaded structure includes an inner thread structure provided in the inner thread hole 106 and an outer thread structure provided on the rod body of the outer thread rod 108, and the inner thread structure matches the outer thread structure.

[0025] To improve the motion transmission efficiency of belt 8, please refer to Figure 1 、 Figure 2 、 Figure 7 and Figure 8, it is necessary to set up an elastic contraction pre-tightening mechanism 11, which is provided with a horizontal hollow shell 111 fixedly mounted on the bottom of the horizontal mounting plate 1 and with a hollow interior, two inner movable plates 115 placed inside the horizontal hollow shell 111 and capable of axially moving along 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 coil spring 119 that enables the driven roller 118 to generate an elastic force on the belt 8. Since the coil spring 119 is in a compressed state, the elastic force will be transmitted to the corresponding side of the belt 8 through the driven roller 118, thereby making the belt 8 in a taut state, so that the belt 8 has a stronger pre-tightening effect on the No. 1 pulley 7 and the No. 2 pulley 94, thereby improving the motion transmission efficiency of the belt 8.

[0026] For the specific structure of the elastic contraction pre-tightening mechanism 11, please refer to Figure 7 and Figure 8 , including two horizontal telescopic rods 116, the horizontal hollow shell 111 is fixedly mounted on the fixed base 112 at the bottom of the horizontal mounting plate 1 through the fixed base 112, the interior of the horizontal hollow shell 111 is provided with a horizontal component movable cavity 113, and the two ends of the horizontal hollow shell 111 are respectively provided with a rod body through-hole 114, and the horizontal hollow shell 111 is provided with two inner movable plates 115 that can move axially along the horizontal component movable cavity 113 inside the horizontal component movable cavity 113, and one end of each inner movable plate 115 is respectively fixedly mounted with a horizontal telescopic rod 116 that passes through the rod body through-hole 114, and the horizontal telescopic rod 116 A coil spring 119 is placed on the outer periphery of the rod body located inside the movable cavity 113 of the horizontal component, and 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 body of the curved connecting rod 117 is installed inside the driven roller 118 through a bearing. The initial length of the coil 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 of which are polygonal structures, and 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.

[0027] When in use, hold the handle 2 by hand, then start the drive motor 6, and then operate the pneumatic pressure control mechanism 10, and then control the rotation direction of the rotor so that the spiral blade 92 produces a downward movement direction when rotating. At this time, the sampling hollow rod 91 will be screwed into the interior of the cement accumulation body. At this time, the blocking built-in object 98 at the bottom can prevent cement from entering the longitudinal sampling cavity 95. When the bottom end of the sampling hollow rod 91 reaches the sampling depth, the annular elastic air film 910 cancels the locking state of the blocking built-in object 98, and continues to make the drive motor 6 drive the sampling hollow rod 91 to rotate. The rod 91 rotates, and the downward moving sampling hollow rod 91 causes cement to enter the longitudinal sampling cavity 95. At the same time, the blocking built-in object 98 moves upward under the action of cement until a predetermined sampling volume is reached, causing the annular elastic air membrane 910 to close its inner diameter due to gas pressure until the center hole is closed. The drive motor 6 can then be controlled to cause the rotor to rotate in the opposite direction. At this time, the reverse rotation of the spiral blade 92 generates an upward movement direction, so that the sampling hollow rod 91 drives the cement sample out of the cement accumulation area, thereby realizing a complete sampling process.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for cement detection, comprising a horizontal mounting plate (1) with handles (2) mounted on both sides, a No. 1 shaft mounting hole (3) and a component mounting opening (4) provided in the horizontal mounting plate (1), a driving motor (6) fixedly mounted on the bottom of the horizontal mounting plate (1) through a motor fixing housing (5), and a No. 1 pulley (7) fixedly mounted on the rotor end of the driving motor (6), characterized in that: Also includes, An openable and closed sampling mechanism (9) is provided with a sampling hollow rod (91) which is linked to a first pulley (7) via a belt (8) and is capable of storing cement samples, a blocking built-in object (98) which is placed in the sampling hollow rod (91) and is capable of moving along the axial direction of the sampling hollow rod (91), and an annular elastic gas film (910) which is installed at the wall thickness of the sampling hollow rod (91) and produces a deformation effect when subjected to gas pressure; And a pneumatic pressure control mechanism (10), which is provided with a gas drive housing (101) fixedly installed in the component installation port (4) and having a hollow interior, a hollow sleeve (103) capable of connecting the gas drive housing (101) and the internal structure of the sampling hollow rod (91), and a piston plate (107) placed in the gas drive housing (101) and moving longitudinally to change the direction of the gas pressure on the annular elastic gas membrane (910).

2. A cement testing sampling device according to claim 1, characterized in that: The open and close sampling mechanism (9) includes a central rotating shaft (93), a spiral blade (92) is provided on the rod body of the sampling hollow rod (91), and a central rotating shaft (93) with an integral structure thereof is provided at the center of the top end of the sampling hollow rod (91), the shaft body in the middle of the central rotating shaft (93) is installed inside the No. 1 shaft body installation hole (3) through a bearing, a No. 2 pulley (94) is fixedly installed on the top end of the central rotating shaft (93), and the No. 2 pulley (94) and the No. 1 pulley (7) are linked by a belt (8), and a longitudinal sampling cavity (95) with an open bottom end is provided inside the sampling hollow rod (91), and the sampling hollow rod (91) is provided with a longitudinal sampling cavity (95) with an open bottom end. The rod (91) is provided with an annular gas compression chamber (96) at the wall thickness near the bottom open end of the longitudinal sampling chamber (95), and the interior of the sampling hollow rod (91) and the central rotating shaft (93) is provided with a No. 1 gas flow hole (97) for connecting the outer space of the central rotating shaft (93) and the top of the annular gas compression chamber (96). The sampling hollow rod (91) is embedded with an annular elastic gas film (910) at the intersection of the annular gas compression chamber (96) and the longitudinal sampling chamber (95), and the sampling hollow rod (91) is provided with a blocking built-in (98) capable of moving axially along the longitudinal sampling chamber (95) inside the longitudinal sampling chamber (95).

3. A cement testing sampling device according to claim 2, characterized in that: The interior of the plugging built-in (98) is provided with a weight-reducing cavity (99) for reducing the overall mass thereof.

4. A cement testing sampling device according to claim 3, characterized in that: The bottom ends of the sampling hollow rod (91) and the plugging built-in (98) are provided with conical circumferential surfaces (911) that match each other and facilitate their downward movement 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 built-in (98) form a complete conical surface, the middle area of ​​the plugging built-in (98) corresponds to the area where the annular elastic air membrane (910) is located.

5. A cement testing sampling device according to claim 4, characterized in that: The pneumatic pressure control mechanism (10) includes an external threaded rod (108), a longitudinal component active cavity (102) is provided inside the gas drive housing (101), an annular gas flow cavity (104) is provided inside the hollow sleeve (103) and is placed on the periphery of the central rotating shaft (93) through a bearing and a sealing ring, and the annular gas flow cavity (104) is connected to one end of the No. 1 gas flow hole (97), and the bottom end of the gas drive housing (101) and the outer circumferential surface of the hollow sleeve (103) are provided with a gas flow hole for connecting the longitudinal component active cavity (102) and the annular gas flow cavity. The gas flow channel (105) of the movable chamber (104) is provided, the top end of the gas drive housing (101) is provided with an internal threaded hole (106), 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 connecting shaft structure (109) with an integral structure therewith, and a piston plate (107) capable of axial movement along the longitudinal component movable chamber (102) is placed inside the gas drive housing (101), and the upper end of the piston plate (107) is installed on the outside of the connecting shaft structure (109) through a bearing.

6. A cement testing sampling device according to claim 5, characterized in that: The thread structure comprises an internal thread structure provided in the internal thread hole (106) and an external thread structure provided on the rod body of the external thread rod (108), and the internal thread structure matches the external thread structure.

7. A cement testing sampling device according to any one of claims 1 to 6, characterized in that: It also includes an elastic contraction pre-tightening mechanism (11), which is provided with a horizontal hollow shell (111) fixedly mounted on the bottom of the horizontal mounting plate (1) and having a hollow interior, two inner movable plates (115) placed inside the horizontal hollow shell (111) and capable of axially moving along the horizontal hollow shell (111), two driven rollers (118) capable of contacting the outside of the belt (8) and rotating with the belt (8), and a coil spring (119) that enables the driven rollers (118) to generate an elastic force on the belt (8).

8. A cement testing sampling device according to claim 7, characterized in that: The elastically retractable pre-tightening mechanism (11) comprises two horizontal telescopic rods (116); the horizontal hollow shell (111) is fixedly mounted on a fixed base (112) at the bottom of the horizontal mounting plate (1) via a fixed base (112); a horizontal component movable cavity (113) is provided inside the horizontal hollow shell (111); a rod body through-hole (114) is provided at each end of the horizontal hollow shell (111); and two rods capable of moving along the horizontal component movable cavity (113) are arranged inside the horizontal component movable cavity (113). 13) An inner movable plate (115) capable of axial movement, wherein a horizontal telescopic rod (116) penetrating a rod body through-hole (114) is fixedly mounted at one end of each inner movable plate (115), a coil spring (119) being sheathed around the rod body inside the movable cavity (113) of the horizontal component, and a curved connecting rod (117) being fixedly mounted at one end of the horizontal telescopic rod (116) outside the horizontal hollow shell (111), and the longitudinal rod body of the curved connecting rod (117) being mounted inside the driven roller (118) via a bearing.

9. A cement testing sampling device according to claim 8, characterized in that: The initial length of the coil spring (119) is greater than the horizontal length of the horizontal component movable cavity (113).

10. A cement testing sampling device according to claim 9, characterized in that: 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 of which are polygonal structures, and 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).

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