A sampling device for concrete production

Abstract

This invention provides a sampling device for concrete production, comprising a base, a mixing drum mounted on the base, a cover plate on the top of the mixing drum, an annular opening between the outer circumference of the cover plate and the inner wall of the mixing drum, and a welded plate fixed between the cover plate and the mixing drum; a first electric telescopic rod rotatable around the outer circumference of the mixing drum is mounted above the base, a fixing plate is fixed to the telescopic end of the first electric telescopic rod, a connecting plate is detachably connected to the fixing plate, and a first automatic telescopic rod and a positioning cylinder are mounted on the connecting plate; a set of sampling cylinders is detachably connected to the bottom of the positioning cylinder, the set of sampling cylinders is arranged in a U-shape and located within the annular opening, and the sampling cylinders have perforations. This invention can effectively sample and test concrete at different locations and depths within the mixing drum, improving the accuracy of the test data and ensuring the quality of the subsequently produced concrete.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, and more particularly to a sampling device for concrete production. Background Technology

[0002] Concrete refers to cement concrete, which is made by mixing cement as a binder, sand and stone as aggregates, and water (which may contain admixtures and additives) in a certain proportion. It is widely used in civil engineering. During the production of concrete, a mixing device is needed to mix the various raw materials. In order to ensure the quality of the concrete produced, it is necessary to take samples and test them regularly so that corresponding measures can be taken based on the test data, such as whether to add appropriate admixtures. However, when using current sampling devices, they generally only open the discharge port of the mixing device and take samples of the concrete as it is discharged. This sampling method has certain limitations. It can only sample the concrete at the bottom of the vertical mixing device, while the concrete in the middle and upper parts of the mixing device cannot be sampled and tested. As a result, the test data after concrete sampling and testing may be inaccurate, which will affect the quality of the concrete produced. Summary of the Invention

[0003] This invention discloses a sampling device for concrete production, which solves the problem that the sampling device can only sample concrete located at the bottom of the mixing device, resulting in inaccurate test data.

[0004] To solve the above-mentioned technical problems, the present invention specifically adopts the following technical solution:

[0005] A sampling device for concrete production includes a base, a mixing drum mounted on the base, a cover plate on the top of the mixing drum, an annular opening between the outer circumference of the cover plate and the inner wall of the mixing drum, and a welded plate fixed between the cover plate and the mixing drum. Above the base is a primary electric telescopic rod that can rotate around the outer circumference of the mixing drum. A fixing plate is fixed to the telescopic end of the primary electric telescopic rod, and a connecting plate is detachably connected to the fixing plate. The connecting plate has a primary automatic telescopic rod that can be raised and lowered, and a positioning cylinder. A set of sampling cylinders is detachably connected to the bottom of the positioning cylinder. The set of sampling cylinders is arranged in a U-shape and located within the annular opening. A through hole is opened on each sampling cylinder, and a sealing ring that is slidably connected and blocks the through hole is fitted onto each sampling cylinder. A control rod that is fixed to the set of sealing rings is fixed to the telescopic end of the primary automatic telescopic rod.

[0006] Preferably, the connecting plate is U-shaped, with the open end of the connecting plate facing the mixing cylinder. A movable plate is slidably connected to the inner side of the connecting plate, and a vertical plate is fixed to the top of the movable plate. A lifting plate is slidably connected to the vertical plate, and the vertical plate and the lifting plate are fixed together by bolts. The main body of the first automatic telescopic rod and the top end of the positioning cylinder are respectively fixed to the lifting plate. Two holes are opened on the movable plate to be adapted to the first automatic telescopic rod and the positioning cylinder respectively.

[0007] Preferably, the cover plate has a set of notches communicating with the annular opening, and the set of notches are distributed in a ring array; a magnet is fixed inside the connecting plate on the side corresponding to the open part; the moving plate is made of steel and is in contact with the magnet; a second electric telescopic rod and a battery are fixed on the top of the fixed plate; the connecting plate and the magnet have round holes for the telescopic end of the second electric telescopic rod to pass through; and a magnet block in contact with the moving plate is fixed to the telescopic end of the second electric telescopic rod.

[0008] Preferably, the bottom of the connecting plate is fixed with two positioning rods that pass through the fixing plate, and the top of the positioning cylinder is connected to a flexible tube that passes through the lifting plate; a set of sampling cylinders are threadedly connected to each other.

[0009] Preferably, a stirring motor is fixed at the center of the top of the cover plate, and the rotating shaft of the stirring motor passes through the cover plate and is fixed to a stirring rod located inside the stirring drum; a reinforcing plate is fixed to the top of the cover plate and is fixed to the top of the stirring drum.

[0010] Preferably, a fixing ring is provided above the base to cover the stirring cylinder, and a support leg is fixed between the fixing ring and the base. A fixing rod connected to the stirring cylinder is fixed to the inner side of the fixing ring. An annular groove is provided at the top of the fixing ring, and a toothed ring is provided at the top of the fixing ring. An annular slider that is slidably connected to the annular groove is fixed at the bottom of the toothed ring. The main body of the first electric telescopic rod is fixed to the top of the toothed ring. A drive motor is fixed to one side of the fixing ring through a bearing plate. A gear is fixed on the shaft of the drive motor, and the teeth on the gear mesh with the teeth on the toothed ring.

[0011] Preferably, a top plate is provided above the mixing drum, a support rod is fixed between the top plate and the base, and a connecting rod connected to the top wall is fixed on the top plate; a storage cylinder is fixed on the top plate, and a set of conveying pipes is connected to the bottom of the storage cylinder, with the bottom ends of the set of conveying pipes passing through a cover plate and fixed to the cover plate.

[0012] Preferably, a winding motor is fixed on the top plate, a winding rod is fixed on the shaft of the winding motor, a connecting rope is wound on the winding rod, the bottom end of the connecting rope passes through the top plate and is fixed to a lifting block, a set of second automatic telescopic rods is fixed on the lifting block, the telescopic end of the second automatic telescopic rod is fixed to an insert rod through the connecting block, and a magnetic ring is fixed on the insert rod; a handle is fixed on the top of the connecting plate, and a set of insertion holes corresponding to the insert rod are opened on the handle, and the handle is made of steel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] After all the raw materials needed for concrete production have been mixed and processed in the mixing drum, sampling and testing are required. The first electric telescopic rod can be activated, causing its telescopic end to retract and pull a set of sampling tubes through the annular opening into the mixing drum. Then, the first automatic telescopic rod can be activated, causing its telescopic end to move a set of sealing rings via a control rod. This removes the sealing rings from blocking the perforations on the sampling tubes, allowing concrete from the mixing drum to enter through the perforations. The first automatic telescopic rod can then be activated again to restore the sealing rings to their original position, blocking the perforations. Subsequent activation of the first electric telescopic rod... After the telescopic end extends upwards, the sampling cylinder is moved out of the mixing drum by the fixing plate. Then, after the connecting plate and the fixing plate are separated, the sampling cylinder can be transferred to the testing chamber, and the concrete inside the sampling cylinder can be taken out for testing. Furthermore, the annular opening allows the first electric telescopic rod to rotate around the outer wall of the mixing drum to sample concrete from different parts of the mixing drum. The set of a set of sampling cylinders can sample concrete at different depths inside the mixing drum. This invention can effectively sample and test concrete at different locations and depths inside the mixing drum, improving the accuracy of the test data and ensuring the quality of the subsequent concrete production. Attached Figure Description

[0015] Figure 1 This is a frontal structural diagram of the present invention;

[0016] Figure 2 This is a top view of the structure of the stirring cylinder of the present invention;

[0017] Figure 3 for Figure 1 A magnified structural diagram at point A;

[0018] Figure 4 This is a schematic diagram showing the structure of the sampling tube of the present invention;

[0019] Figure 5 This is a top view of the connecting plate of the present invention.

[0020] Figure 6 This is a schematic diagram showing the structure of the cleaning tube of the present invention.

[0021] In the diagram: 1. Base; 2. Mixing drum; 3. Cover plate; 31. Annular opening; 32. Welding plate; 33. Reinforcing plate; 34. Notch; 35. Mixing motor; 4. Electric telescopic rod No. 1; 41. Fixing plate; 42. Electric telescopic rod No. 2; 43. Battery; 5. Connecting plate; 51. Automatic telescopic rod No. 1; 52. Positioning cylinder; 53. Sampling cylinder; 54. Perforation; 55. Sealing ring; 56. Control rod; 57. Magnet; 58. Handle; 59. Positioning 6. Pole; 61. Moving plate; 62. Vertical plate; 63. Lifting plate; 74. Flexible hose; 85. Fixing ring; 91. Support leg; 10. Fixing rod; 11. Gear ring; 12. Annular slider; 13. Drive motor; 14. Gear; 15. Top plate; 16. Winding motor; 17. Winding rod; 18. Connecting rope; 19. Lifting block; 20. No. 2 automatic telescopic rod; 10. Inserting rod; 11. Magnet ring; 12. Support rod; 13. Storage cylinder; 14. Conveying pipe; 15. Cleaning pipe. Detailed Implementation

[0022] The specific content of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a sampling device for concrete production, including a base 1, a mixing drum 2 on the base 1, a cover plate 3 on the top of the mixing drum 2, an annular opening 31 between the outer ring surface of the cover plate 3 and the inner wall of the mixing drum 2, and a welding plate 32 fixed between the cover plate 3 and the mixing drum 2; a first electric telescopic rod 4 that can rotate around the outer ring surface of the mixing drum 2 is provided above the base 1, a fixing plate 41 is fixed to the telescopic end of the first electric telescopic rod 4, a connecting plate 5 is detachably connected to the fixing plate 41, and a first automatic telescopic rod 51 that can be raised and lowered and a positioning cylinder 52 are provided on the connecting plate 5; a set of sampling cylinders 53 is detachably connected to the bottom end of the positioning cylinder 52, the set of sampling cylinders 53 is arranged in a U-shape and located in the annular opening 31, a through hole 54 is opened on the sampling cylinder 53, and a sealing ring 55 that is slidably connected and blocks the through hole 54 is also fitted on the sampling cylinder 53; a control rod 56 that is fixed to the sealing ring 55 is fixed to the telescopic end of the first automatic telescopic rod 51.

[0024] like Figure 1 , Figure 3 and Figure 5As shown, the connecting plate 5 is U-shaped, with its open portion facing the mixing cylinder 2. A movable plate 6 is slidably connected to the inner side of the connecting plate 5. A vertical plate 61 is fixed to the top of the movable plate 6, and a lifting plate 62 is slidably connected to the vertical plate 61. The vertical plate 61 and the lifting plate 62 are fixed together by bolts. The main body of the first automatic telescopic rod 51 and the top of the positioning cylinder 52 are respectively fixed to the lifting plate 62. The movable plate 6 has two holes that are respectively adapted to the first automatic telescopic rod 51 and the positioning cylinder 52. There are two vertical plates 61, which are symmetrically distributed front and back. Figure 1 and Figure 3 Only one is shown in the image; the tops of the two vertical plates 61 pass through the bottom of the lifting plate 62 respectively. Both vertical plates 61 have a set of screw holes distributed from top to bottom. The lifting plate 62 also has screw holes. After adjusting the height of the lifting plate 62, the lifting plate 62 is fixed with bolts so that the positioning cylinder 52 and the first automatic telescopic rod 51 can rise or fall. After adjusting the height of a set of sampling cylinders 53, the set of sampling cylinders 53 can sample concrete at different heights in the mixing drum 2.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the cover plate 3 has a set of notches 34 connected to the annular opening 31, and the set of notches 34 are arranged in a ring array; a magnet 57 is fixed on the side of the connecting plate 5 corresponding to the open part; the moving plate 6 is made of steel and is in contact with the magnet 57; a second electric telescopic rod 42 and a battery 43 are fixed on the top of the fixed plate 41; the connecting plate 5 and the magnet 57 have round holes for the telescopic end of the second electric telescopic rod 42 to pass through; the telescopic end of the second electric telescopic rod 42 is fixed with a magnet block in contact with the moving plate 6. The notch 34 is designed to facilitate sampling of concrete near the center of the mixing drum 2. Activating the second electric telescopic rod 42 allows the telescopic end of the rod to drive the magnet through the holes in the connecting plate 5 and the magnet 57, thus moving the moving plate 6. The moving plate 6 then moves the first automatic telescopic rod 51 and the positioning cylinder 52 into the notch 34, allowing the sampling cylinder 53 to move towards the center of the mixing drum 2. The notch 34 further expands the sampling range of the concrete inside the mixing drum 2, enabling more accurate data on the concrete after mixing and allowing workers to take more precise measures. The magnet 57 holds the moving plate 6 in place, preventing it from moving arbitrarily. When the telescopic end of the second electric telescopic rod 42 moves the moving plate 6, the magnet on the telescopic end holds it in place, controlling its movement and facilitating its subsequent return to its original position.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the bottom of the connecting plate 5 is fixed with two positioning rods 59 that pass through the fixed plate 41 respectively, and the top of the positioning cylinder 52 is connected to a flexible hose 63 that passes through the lifting plate 62; a set of sampling cylinders 53 are threadedly connected to each other. The two positioning rods 59 can fix the connecting plate 5 to the fixed plate 41 after it is placed on the fixed plate 41, preventing the connecting plate 5 from moving at will; a set of sampling cylinders 53 is provided with at least three, and the bottom of the two upper sampling cylinders 53 is fixed with threaded heads. The upper part of the three sampling cylinders 53 is provided with threads that are compatible with the threaded heads, so as to connect a set of sampling cylinders 53 together in a U-shape, and the bottom of the positioning cylinder 52 is connected to a threaded tube, so as to connect the uppermost sampling cylinder 53 to the threaded tube at the bottom of the positioning cylinder 52; a set of sampling cylinders 53 and After the positioning cylinder 52 is disassembled, when the mixing drum 2 needs to be cleaned, the cleaning pipe 10 can be threaded to the bottom of the positioning cylinder 52, and then water can be injected into the positioning cylinder 52 through the hose 63. The water will then enter the cleaning pipe 10 and be discharged through the drain hole on the cleaning pipe 10. As the first electric telescopic rod 4 rotates around the mixing drum 2, the water in the cleaning pipe 10 can cover the inner wall of the mixing drum 2 to the maximum extent, cleaning the inner wall of the mixing drum 2 and preventing residual concrete from adhering to the inner wall of the mixing drum 2. When the cleaning pipe 10 rotates, it can rub against the inner wall of the mixing drum 2 to scrape off the residual concrete.

[0027] like Figure 1 and Figure 2 As shown, a stirring motor 35 is fixed at the center of the top of the cover plate 3. The rotating shaft of the stirring motor 35 passes through the cover plate 3 and is fixed to a stirring rod located inside the mixing drum 2. A reinforcing plate 33, which is fixed to the top of the mixing drum 2, is fixed to the top of the cover plate 3. After the stirring motor 35 is started, the stirring rod can be rotated to stir the concrete in the mixing drum 2. The concrete raw materials can be discharged into the mixing drum 2 through the feed port on the mixing drum 2. The reinforcing plate 33 can increase the firmness of the connection between the cover plate 3 and the mixing drum 2.

[0028] like Figure 1As shown, a fixing ring 7 is provided above the base 1 to cover the stirring cylinder 2. A support leg 71 is fixed between the fixing ring 7 and the base 1. A fixing rod 72 connected to the stirring cylinder 2 is fixed to the inner side of the fixing ring 7. An annular groove is provided at the top of the fixing ring 7, and a gear ring 73 is provided at the top of the fixing ring 7. An annular slider 74 that is slidably connected to the annular groove is fixed at the bottom of the gear ring 73. The main body of the first electric telescopic rod 4 is fixed to the top of the gear ring 73. A drive motor 75 is fixed to one side of the fixing ring 7 via a bearing plate. A gear 76 is fixed on the shaft of the drive motor 75, and the teeth on the gear 76 mesh with the teeth on the gear ring 73. After the drive motor 75 is started, the shaft of the drive motor 75 drives the gear 76 to rotate, and the gear 76 causes the gear ring 73 to rotate accordingly. The annular slider 74, in conjunction with the annular groove on the fixing ring 7, assists the gear ring 73 in rotating, thereby changing the position of the first electric telescopic rod 4. The drive motor 75 is a servo motor.

[0029] like Figure 1 and Figure 2 As shown, a top plate 8 is provided above the mixing drum 2. A support rod 88 is fixed between the top plate 8 and the base 1. A connecting rod connected to the top wall is fixed on the top plate 8. A storage cylinder 9 is fixed on the top plate 8. A set of conveying pipes 91 are connected to the bottom of the storage cylinder 9. The bottom ends of the set of conveying pipes 91 pass through the cover plate 3 and are fixed to the cover plate 3. When it is necessary to add admixtures to the mixing drum 2, the admixtures can be discharged into the storage cylinder 9 and then evenly discharged into the mixing drum 2 through the set of conveying pipes 91 to improve the mixing efficiency of various raw materials. In addition, the conveying pipes 91 can increase the stability of the cover plate 3.

[0030] like Figure 1 and Figure 3As shown, a winding motor 81 is fixed on the top plate 8, a winding rod 82 is fixed on the shaft of the winding motor 81, a connecting rope 83 is wound on the winding rod 82, the bottom end of the connecting rope 83 passes through the top plate 8 and is fixed to a lifting block 84, a set of second automatic telescopic rods 85 is fixed on the lifting block 84, the telescopic end of the second automatic telescopic rod 85 is fixed to a plug rod 86 through a connecting block, and a magnetic ring 87 is fixed on the plug rod 86; a handle 58 is fixed on the top of the connecting plate 5, and a set of plug holes corresponding to the plug rod 86 are opened on the handle 58, and the handle 58 is made of steel. When it is necessary to separate the connecting plate 5 from the fixing plate 41, the telescopic end of the first electric telescopic rod 4 can be extended upwards, causing a set of sampling cylinders 53 to move outside the mixing cylinder 2. When the insertion hole on the handle 58 corresponds to the insertion rod 86, the second automatic telescopic rod 85 is activated. The telescopic end of the second automatic telescopic rod 85 extends, causing the insertion rod 86 to be inserted into the insertion hole on the handle 58. The magnetic ring 87 then contacts the handle 58, holding the handle 58 in place. Then, the first electric telescopic rod 4 rotates, changing its position. The winding motor 81 is a servo motor, causing the winding rod 82 to rotate and unwind the connecting rope 83. This causes the lifting block 84 to move downwards, bringing the sampling cylinder 53 close to the ground, so that the staff can separate the sampling cylinder 53 from the positioning cylinder 52. Then, the sampling cylinder 53 is pulled out from the inside of the sealing ring 55.

[0031] In use, activate the No. 1 electric telescopic rod 4 (the No. 1 electric telescopic rod 4 can be a three-section telescopic rod). After the telescopic end of the No. 1 electric telescopic rod 4 retracts, a set of sampling cylinders 53 enters the mixing drum 2. There are three sampling cylinders 53 in a set, so that the concrete in the upper, middle and lower parts of the mixing drum 2 can be sampled. When sampling is required, activate the No. 1 automatic telescopic rod 51 to move the control rod 56 downward, which drives a set of sealing rings 55 to move downward, opening the perforations 54 on the sampling cylinders 53. This allows the concrete in the mixing drum 2 to enter the three sampling cylinders 53 respectively. Then, activate the No. 1 automatic telescopic rod 51 to move the sealing rings 55 downward. To restore the original position, block the perforation 54; then activate the first electric telescopic rod 4, extending its telescopic end upwards, causing the fixing plate 41 to move the connecting plate 5 upwards, moving a set of sampling cylinders 53 outside the mixing drum 2. Then remove the connecting plate 5 from the fixing plate 41, and then separate the sampling cylinders 53 from the positioning cylinder 52, transferring the sampling cylinders 53 to the testing chamber. When it is necessary to sample concrete at different locations inside the mixing drum 2, the main body of the first electric telescopic rod 4 can be rotated around the mixing drum 2 to change the position of the sampling cylinders 53, so that the concrete inside the mixing drum 2 can be sampled and tested from all angles.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A sampling device for concrete production, comprising a base (1), characterized in that: A stirring drum (2) is provided on the base (1), and a cover plate (3) is provided on the top of the stirring drum (2). An annular opening (31) is provided between the outer ring surface of the cover plate (3) and the inner wall of the stirring drum (2). A welding plate (32) is fixed between the cover plate (3) and the stirring drum (2). A first electric telescopic rod (4) that can rotate around the outer ring surface of the stirring drum (2) is provided above the base (1). A fixing plate (41) is fixed to the telescopic end of the first electric telescopic rod (4). A connecting plate (5) is detachably connected to the fixing plate (41). 5) It is equipped with a liftable first automatic telescopic rod (51) and a positioning cylinder (52); the bottom end of the positioning cylinder (52) is detachably connected to a set of sampling cylinders (53), the set of sampling cylinders (53) is arranged in a 1-shape and located in an annular opening (31), the sampling cylinder (53) is provided with a through hole (54), the sampling cylinder (53) is also fitted with a sliding connection and a sealing ring (55) that blocks the through hole (54), and the telescopic end of the first automatic telescopic rod (51) is fixed with a control rod (56) that is fixed to the set of sealing rings (55).

2. The sampling device for concrete production according to claim 1, characterized in that: The connecting plate (5) is U-shaped, with the open part of the connecting plate (5) facing the stirring cylinder (2). A movable plate (6) is slidably connected to the inner side of the connecting plate (5). A vertical plate (61) is fixed to the top of the movable plate (6). A lifting plate (62) is slidably connected to the vertical plate (61). The vertical plate (61) and the lifting plate (62) are fixed together by bolts. The main body of the first automatic telescopic rod (51) and the top of the positioning cylinder (52) are respectively fixed to the lifting plate (62). Two holes are opened on the movable plate (6) to be adapted to the first automatic telescopic rod (51) and the positioning cylinder (52) respectively.

3. A sampling device for concrete production according to claim 2, characterized in that: The cover plate (3) has a set of notches (34) connected to the annular opening (31), and the set of notches (34) are arranged in a ring array; a magnet (57) is fixed on the side of the connecting plate (5) corresponding to the open part; the moving plate (6) is made of steel and is in contact with the magnet (57); the top of the fixed plate (41) is fixed with a second electric telescopic rod (42) and a battery (43); the connecting plate (5) and the magnet (57) have round holes for the telescopic end of the second electric telescopic rod (42) to pass through; the telescopic end of the second electric telescopic rod (42) is fixed with a magnet block in contact with the moving plate (6).

4. A sampling device for concrete production according to claim 2, characterized in that: The bottom of the connecting plate (5) is fixed with two positioning rods (59) that pass through the fixing plate (41) respectively, and the top of the positioning cylinder (52) is connected to a flexible hose (63) that passes through the lifting plate (62); a set of sampling cylinders (53) are threadedly connected to each other.

5. A sampling device for concrete production according to claim 1, characterized in that: A stirring motor (35) is fixed at the center of the top of the cover plate (3). The rotating shaft of the stirring motor (35) passes through the cover plate (3) and is fixed with a stirring rod located inside the stirring drum (2). A reinforcing plate (33) is fixed at the top of the cover plate (3) and is fixed to the top of the stirring drum (2).

6. A sampling device for concrete production according to claim 1, characterized in that: The base (1) is provided with a fixing ring (7) that covers the stirring cylinder (2) above it. A support leg (71) is fixed between the fixing ring (7) and the base (1). A fixing rod (72) connected to the stirring cylinder (2) is fixed on the inner side of the fixing ring (7). An annular groove is provided on the top of the fixing ring (7). A toothed ring (73) is provided on the top of the fixing ring (7). An annular slider (74) that is slidably connected to the annular groove is fixed on the bottom of the toothed ring (73). The main body of the first electric telescopic rod (4) is fixed on the top of the toothed ring (73). A drive motor (75) is fixed on one side of the fixing ring (7) through a bearing plate. A gear (76) is fixed on the shaft of the drive motor (75). The teeth on the gear (76) mesh with the teeth on the toothed ring (73).

7. A sampling device for concrete production according to claim 1, characterized in that: The mixing drum (2) is provided with a top plate (8) above it. A support rod (88) is fixed between the top plate (8) and the base (1). A connecting rod connected to the top of the wall is fixed on the top plate (8). A storage cylinder (9) is fixed on the top plate (8). A set of conveying pipes (91) is connected to the bottom of the storage cylinder (9). The bottom ends of the set of conveying pipes (91) pass through the cover plate (3) and are fixed to the cover plate (3).

8. A sampling device for concrete production according to claim 7, characterized in that: A winding motor (81) is fixed on the top plate (8). A winding rod (82) is fixed on the shaft of the winding motor (81). A connecting rope (83) is wound on the winding rod (82). The bottom end of the connecting rope (83) passes through the top plate (8) and is fixed with a lifting block (84). A set of No. 2 automatic telescopic rods (85) is fixed on the lifting block (84). The telescopic end of the No. 2 automatic telescopic rod (85) is fixed with a plug rod (86) through a connecting block. A magnetic ring (87) is fixed on the plug rod (86). A handle (58) is fixed on the top of the connecting plate (5). A set of plug holes corresponding to the plug rod (86) are opened on the handle (58). The handle (58) is made of steel.

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