Sample preparation device for calcareous sand test

Abstract

The invention discloses a sample preparation device for a calcareous sand test, which comprises a base, a mounting frame and a forming cylinder arranged on the base, and further comprises a feeding assembly, a spraying assembly, a knocking assembly and a driving assembly, the feeding assembly is connected with the mounting frame and is positioned above the forming cylinder, and a screen is arranged in the feeding assembly; the spraying assembly is connected with the feeding assembly and used for spraying the adhesive into the forming cylinder. The knocking assembly is arranged on the base, corresponds to the forming cylinder and can abut against the feeding assembly. The driving assembly is arranged on the mounting frame and connected with the feeding assembly so that the feeding assembly can rotate partially, the screen can reciprocate in the horizontal direction, and the knocking assembly knocks the outer wall of the forming cylinder in a reciprocating mode. The forming effect of the calcareous sand is effectively improved, and the accuracy of subsequent mechanical property testing of the calcareous sand can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of marine rock and soil material testing, and in particular to a sample preparation device for calcareous sand testing. Background Art

[0002] The South China Sea and the vicinity of the islands are areas where calcareous sand is distributed. With the needs of oil and gas resource development and national defense construction, engineering construction will be carried out in the coastal waters and seas of the South China Sea, and calcareous sand has undoubtedly become the carrier of engineering activities. Calcium sand is a special soil of marine biological origin with a CaCO3 content of more than 50%. From a microstructural point of view, the intergranular porosity is large and there are internal pores. These internal pores are either interconnected or called blind holes. The special sedimentary environment makes calcareous sand easy to break, highly compressible and low in strength. Therefore, when using calcareous sand as raw material for marine engineering construction, it needs to be reinforced. Since calcareous sand is different from traditional construction materials, the reinforced calcareous sand needs to be subjected to performance tests to test the shear and compressive properties of the calcareous sand.

[0003] Before conducting a mechanical property test on calcareous sand, samples need to be prepared. Currently, the preparation of calcareous sand samples is simply to pour the calcareous sand into a mold and add a binder for preparation. The molding effect is not good. In addition, due to the presence of other impurities in the calcareous sand, the data obtained after mixing other impurities with calcareous sand particles for sample preparation and testing will be quite different, and the accuracy of the mechanical property test using calcareous sand cannot be guaranteed. Summary of the Invention

[0004] The present application provides a sample preparation device for calcareous sand testing, which not only more effectively improves the molding effect of calcareous sand, but also improves the accuracy of subsequent mechanical property testing using calcareous sand.

[0005] In the first aspect, the present application provides a sample preparation device for calcareous sand testing, comprising a base, a mounting frame and a forming cylinder arranged on the base, and also comprising a feeding assembly, a spraying assembly, a knocking assembly and a driving assembly. The feeding assembly is connected to the mounting frame and is located above the forming cylinder, and a screen is provided in the feeding assembly; the spraying assembly is connected to the feeding assembly for spraying the adhesive into the forming cylinder; the knocking assembly is arranged on the base, the knocking assembly corresponds to the forming cylinder and can abut the feeding assembly; the driving assembly is arranged on the mounting frame, and the driving assembly is connected to the feeding assembly for enabling part of the feeding assembly to rotate, so that the screen moves back and forth in the horizontal direction, and the knocking assembly knocks the outer wall of the forming cylinder back and forth.

[0006] The cam is connected to the driving member by a toothed connection, and the cam is connected to the guide rail with a toothed connection, and the cam is connected to the guide rail with a toothed connection, and the cam is connected to the guide rail with a toothed connection. The delivery pump, nozzle, liquid extraction pipe and delivery pipe, the liquid storage tank is fixedly connected to the feed shell, and the interior of the liquid storage tank is provided with an adhesive; the delivery pump is fixedly connected to the feed shell; the nozzle is fixedly connected to the outer wall of the feed shell and faces the interior of the forming cylinder; one end of the liquid extraction pipe extends into the liquid storage tank, and the other end is connected to the delivery pump; the two ends of the delivery pipe are respectively connected to the delivery pump and the nozzle; the driving assembly includes a driving motor, a first gear, a driving rod, a second gear and a rotating frame, the driving motor is fixedly connected to the mounting frame, and the output shaft of the driving motor passes through the mounting frame; the first gear is fixedly connected to the output shaft of the driving motor; the driving rod is rotatably arranged through the mounting frame; the second gear is fixedly connected to one end of the driving rod and meshes with the first gear; the rotating frame is fixedly connected to the other end of the driving rod, and the part of the rotating frame away from the driving rod is fixedly connected to the inner wall of the feed shell; the inner wall of the feed shell is fixedly connected to a guide shell located above the screen, and the guide shell is arranged in a trumpet shape; the bottom of the feed shell is provided with a feeding pipe connected to the interior of the feed shell, and the feeding pipe is provided with an electromagnetic valve.

[0007] In some embodiments, the forming cylinder includes a first mold shell and a second mold shell, the first mold shell is fixedly mounted on the base, one side of the first mold shell is rotatably connected to a support shaft, and the second mold shell is fixedly connected to the support shaft; one end of the support shaft is fixedly connected to a third gear, the lower surface of the base is fixedly connected to a hydraulic cylinder, the telescopic end of the hydraulic cylinder is connected to a rack, and the rack is meshed with the third gear; a vertical plate is movably provided at the bottom of the first mold shell, one end of the vertical plate is connected to a chassis, and the other end is connected to a pulley; the telescopic end of the hydraulic cylinder is connected to a mounting plate, and the mounting plate has an inclined surface that abuts the pulley.

[0008] The sample preparation device for the calcareous sand test based on the embodiment of the present application can rotate part of the feeding component only by operating a driving component. As the feeding component rotates, the screen can be driven to reciprocate in the horizontal direction, which not only prevents the screen from being blocked, but also facilitates the screening of impurities in the calcareous sand, preventing the impurities from affecting the accuracy of the subsequent mechanical property test of the calcareous sand; and, by setting the screen, the size of the calcareous sand particles in the calcareous sand sample can be made closer; during the rotation of the feeding component part, the spraying component connected thereto can be rotated, thereby making the adhesive sprayed into the forming cylinder and the calcareous sand more evenly and fully mixed; while the feeding component rotates, the knocking component can also continuously knock on the outer wall of the forming cylinder, and the vibration generated by the knocking can naturally precipitate and compact the calcareous sand, and can also improve the adhesion effect of the adhesive; in this way, not only the molding effect of the calcareous sand is more effectively improved, but also the accuracy of the subsequent mechanical property test of the calcareous sand can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 This is a schematic diagram of the three-dimensional structure of the sample preparation device used for the calcareous sand test in this application;

[0011] Figure 2 This is a schematic diagram of the structure of the feed assembly of this application;

[0012] Figure 3 This is a schematic diagram of the structure of the feeding component and the spraying component of this application;

[0013] Figure 4 This is a schematic diagram of the internal structure of the feed shell of this application;

[0014] Figure 5 This is a schematic structural diagram of the first mold shell and the second mold shell of this application;

[0015] Figure 6 A schematic diagram of the three-dimensional structure of the sample preparation device for calcareous sand testing from another perspective;

[0016] Figure 7 This is a schematic diagram of the structure of the rack and the third gear of this application;

[0017] Figure 8 This is a schematic diagram of the structure of the hydraulic cylinder, mounting plate, vertical plate and pulley of this application.

[0018] Description of reference numerals:

[0019] 1. Feed assembly; 11. Feed housing; 111. Bump; 112. Feed pipe; 113. Guide housing; 1121. Solenoid valve; 12. Fixing ring; 121. Inclined block; 13.; 2. Spray assembly; 21. Liquid storage tank; 22. Delivery pump; 23. Delivery pipe; 24. Spray head; 25. Liquid extraction pipe; 3. Knocking assembly; 31. Mounting rod; 311. Knocking column; 32. Second elastic member; 33. Fixed seat; 4. Drive assembly; 41. Drive motor ; 42. First gear; 43. Second gear; 44. Rotating frame; 45. Driving rod; 5. Mounting frame; 6. Base; 611. Mounting plate; 612. Rack; 7. Forming cylinder; 71. Second mold shell; 711. Support shaft; 712. Third gear; 72. First mold shell; 721. Chassis; 722. Vertical plate; 7221. Pulley; 8. Screen; 81. Moving body; 811. Abutment wheel; 82. Movable body; 821. First elastic member.

[0020] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] See also Figures 1 to 8 The present application proposes a sample preparation device for calcareous sand testing, comprising a base 6, a mounting frame 5 and a forming cylinder 7 arranged on the base 6, and also comprising a feeding assembly 1, a spraying assembly 2, a knocking assembly 3 and a driving assembly 4. The feeding assembly 1 is connected to the mounting frame 5 and is located above the forming cylinder 7, and a screen 8 is provided in the feeding assembly 1; the spraying assembly 2 is connected to the feeding assembly 1 to spray the adhesive into the forming cylinder 7; the knocking assembly 3 is arranged on the base 6, and the knocking assembly 3 corresponds to the forming cylinder 7 and can abut the feeding assembly 1; the driving assembly 4 is arranged on the mounting frame 5, and the driving assembly 4 is connected to the feeding assembly 1 to enable part of the feeding assembly 1 to rotate, so that the screen 8 moves back and forth in the horizontal direction, so that the knocking assembly 3 knocks the outer wall of the forming cylinder 7 back and forth.

[0023] In the embodiment provided by the present application, by making the driving assembly 4 run, it is possible to rotate part of the feed assembly 1, and as the feed assembly 1 rotates, the screen 8 can be driven to reciprocate in the horizontal direction. In this way, not only can the screen 8 be prevented from being blocked, but it is also convenient to screen out impurities in the calcareous sand, and prevent impurities from affecting the accuracy of the subsequent mechanical property test performed by the calcareous sand. In addition, by providing the screen 8, the size of the calcareous sand particles in the calcareous sand sample can be made closer, further ensuring the accuracy of the mechanical property test performed by the calcareous sand. Wherein, the adhesive is in a liquid state. The calcareous sand will enter the forming cylinder 7 through the feed assembly 1. During the rotation of the feed assembly 1 part, the spraying assembly 2 connected thereto can be rotated, thereby making the adhesive sprayed into the forming cylinder 7 more evenly and fully mixed with the calcareous sand, thereby improving the solidification molding effect of the calcareous sand. While the feeding component 1 is rotating, the knocking component 3 can continuously knock the outer wall of the forming cylinder 7. The vibration generated by the knocking can naturally precipitate and compact the calcareous sand, and can also improve the adhesion effect of the adhesive, which can further improve the solidification and molding effect of the calcareous sand.

[0024] In some embodiments of the present application, the feeding assembly 1 includes a fixed ring 12, a feeding shell 11 and a movable body 81, the outer peripheral wall of the fixed ring 12 is fixedly connected to the mounting frame 5, and the inner peripheral wall of the fixed ring 12 is provided with a plurality of inclined blocks 121 with annular intervals; the feeding shell 11 is connected to the driving assembly 4, and a screen 8 is provided inside the feeding shell 11, and one end of the screen 8 is fixedly connected to a movable body 82, and the movable body 82 is movably arranged in the feeding shell 11, and the movable body 82 is connected to a first elastic member 821, and the first elastic member 821 is fixedly connected to the inner wall of the feeding shell 11; the movable body 81 is movably arranged in the feeding shell 11, and one end of the movable body 81 is provided with an abutting wheel 811 that can abut against a plurality of inclined blocks 121, and the other end of the movable body 81 is fixedly connected to the other end of the screen 8.

[0025] The first elastic member 821 includes a first coil spring. When the drive assembly 4 rotates the feed housing 11, the contact wheel 811 on the movable body 81 sequentially contacts the plurality of inclined blocks 121, causing the movable body 81 to move toward the inside of the feed housing 11, thereby causing the screen 8 and the movable body 82 to move and compress the first coil spring. When the contact wheel 811 disengages the inclined blocks 121, the screen 8 and the movable body 82 move in opposite directions under the elastic force of the first elastic member 821. This allows the screen 8 to reciprocate horizontally, effectively screening the calcareous sand on the screen 8. The fixed ring 12 encloses the feed housing 11.

[0026] In some embodiments of the present application, the outer peripheral wall of the feed shell 11 is provided with a plurality of protrusions 111 spaced in an annular manner, and the knocking assembly 3 includes a fixed seat 33, a mounting rod 31, a second elastic member 32 and a knocking column 311, and the fixed seat 33 is arranged on the base 6; one end of the mounting rod 31 is rotatably connected to the fixed seat 33, and the other end can abut against the protrusion 111; the two ends of the second elastic member 32 are respectively fixedly connected to the forming cylinder 7 and the mounting rod 31; the knocking column 311 is fixedly connected to the mounting rod 31 and corresponds to the outer wall of the forming cylinder 7.

[0027] When the feed shell 11 rotates, the multiple protrusions 111 will sequentially abut the other end of the mounting rod 31, causing the mounting rod 31 to move away from the forming cylinder 7 and stretching the second elastic member 32, causing the knocking column 311 to move away from the forming cylinder 7. When the protrusions 111 and the mounting rod 31 are separated from each other, the mounting rod 31 will move closer to the forming cylinder 7 under the elastic force of the second elastic member 32, causing the knocking column 311 to knock the outer wall of the forming cylinder 7. In this way, as the feed shell 11 continues to rotate, the knocking column 311 will reciprocately knock the outer wall of the forming cylinder 7. The portion where the protrusions 111 abut against the mounting rod 31 is arranged at an angle. Of course, the protrusions 111 can also be arranged in an arc shape.

[0028] In some embodiments of the present application, the spray assembly 2 includes a liquid storage tank 21, a delivery pump 22, a nozzle 24, a liquid extraction pipe 25 and a delivery pipe 23. The liquid storage tank 21 is fixedly connected to the feed shell 11, and an adhesive is provided inside the liquid storage tank 21; the delivery pump 22 is fixedly connected to the feed shell 11; the nozzle 24 is fixedly connected to the outer wall of the feed shell 11 and faces the interior of the forming cylinder 7; one end of the liquid extraction pipe 25 extends into the liquid storage tank 21, and the other end is connected to the delivery pump 22; the two ends of the delivery pipe 23 are respectively connected to the delivery pump 22 and the nozzle 24.

[0029] As the feed housing 11 rotates, reformed sand is added to the feed housing 11 and the delivery pump 22 is activated, which draws the liquid adhesive from the liquid storage tank 21 into the delivery pipe 23 through the liquid extraction pipe 25. The adhesive is then delivered to the spray head 24 through the delivery pipe 23 and sprayed into the forming cylinder 7. The rotation of the feed housing 11 causes the spray assembly 2 to rotate accordingly, that is, the spray head 24 also rotates accordingly, and the adhesive can be evenly sprayed into the forming shell.

[0030] In some embodiments of the present application, the drive assembly 4 includes a drive motor 41, a first gear 42, a drive rod 45, a second gear 43 and a rotating frame 44. The drive motor 41 is fixedly connected to the mounting frame 5, and the output shaft of the drive motor 41 passes through the mounting frame 5; the first gear 42 is fixedly connected to the output shaft of the drive motor 41; the drive rod 45 is rotatably passed through the mounting frame 5; the second gear 43 is fixedly connected to one end of the drive rod 45 and engages with the first gear 42; the rotating frame 44 is fixedly connected to the other end of the drive rod 45, and the part of the rotating frame 44 away from the drive rod 45 is fixedly connected to the inner wall of the feed shell 11.

[0031] The driving motor 41 is started, and the output shaft of the driving motor 41 rotates the first gear 42, which in turn rotates the second gear 43 and the driving rod 45 and the rotating frame 44, which in turn rotates the feed shell 11.

[0032] In some embodiments of the present application, the forming cylinder 7 includes a first mold shell 72 and a second mold shell 71. The first mold shell 72 is fixedly mounted on the base 6. One side of the first mold shell 72 is rotatably connected to a support shaft 711, and the second mold shell 71 is fixedly connected to the support shaft 711; one end of the support shaft 711 is fixedly connected to a third gear 712, and the lower surface of the base 6 is fixedly connected to a hydraulic cylinder, and the telescopic end of the hydraulic cylinder is connected to a rack 612, which is engaged with the third gear 712.

[0033] When the calcareous sand in the molding cylinder 7 is formed, the hydraulic cylinder is started, and the telescopic end of the hydraulic cylinder causes the rack 612 to perform reciprocating linear motion, the rack 612 causes the third gear 712 to rotate, and the third gear 712 causes the support shaft 711 to rotate, thereby causing the second mold shell 71 to rotate and move away from the first mold, which is conducive to demolding the molded calcareous sand.

[0034] In some embodiments of the present application, a vertical plate 722 is movably provided at the bottom of the first mold shell 72, one end of the vertical plate 722 is connected to the chassis 721, and the other end is connected to the pulley 7221; the telescopic end of the hydraulic cylinder is connected to the mounting plate 611, and the mounting plate 611 has an inclined surface that abuts the pulley 7221.

[0035] When the hydraulic cylinder is activated, the second mold is moved away from the first mold, and the mounting plate 611 is also moved. When the mounting plate 611 moves, its inclined surface causes the pulley 7221 and the vertical plate 722 to rise, thereby moving the bottom plate 721 upward and lifting the formed calcareous sand upward, further improving the convenience of demolding the calcareous sand. The vertical plate 722 can be equipped with a third spring, the two ends of which are respectively connected to the vertical plate 722 and the bottom of the first mold shell 72.

[0036] In some embodiments of the present application, a guide shell 113 located above the screen 8 is fixedly connected to the inner wall of the feed shell 11 , and the guide shell 113 is arranged in a trumpet shape.

[0037] The opening size of the guide shell 113 close to the screen 8 is larger than the opening size away from the screen 8. The setting of the guide shell 113 can guide the calcareous sand in the feed shell 11 to the screen 8 below, preventing the screen 8 from being unable to receive more calcareous sand due to its activity.

[0038] In some embodiments of the present application, a feed pipe 112 communicating with the interior of the feed shell 11 is provided at the bottom of the feed shell 11 , and the feed pipe 112 is provided with a solenoid valve 1121 .

[0039] The opening degree of the feed pipe 112 can be controlled by the solenoid valve 1121, thereby adjusting the amount of calcareous sand particles discharged into the forming cylinder 7. Discharging the calcareous sand into the forming cylinder 7 at a lower flow rate allows a larger portion of the calcareous sand to be mixed with the binder. Discharging the calcareous sand into the forming cylinder 7 at a higher flow rate allows the calcareous sand to be discharged more quickly. The configuration of the solenoid valve 1121 allows the calcareous sand to be discharged into the forming cylinder 7 at an appropriate flow rate, which not only allows the calcareous sand to be discharged into the forming cylinder 7 more quickly but also further improves the forming effect of the calcareous sand.

[0040] Working principle: When in use, the staff puts the calcareous sand to be prepared into the feed shell 11, guides it to the screen 8 through the guide shell 113, and then starts the drive motor 41. The drive motor 41 cooperates with the first gear 42 to drive the second gear 43 to rotate, and the second gear 43 cooperates with the drive rod 45 to drive the rotating frame 44 to rotate. The rotating frame 44 drives the feed shell 11 to rotate. When the feed shell 11 rotates, it drives the abutment wheel 811 to rotate. When the abutment wheel 811 contacts the inclined block 121, the abutment wheel 811 is pushed by the inclined block 121, and the screen 8 is moved by the moving driving body to perform reciprocating screening of the calcareous sand.

[0041] The calcareous sand after screening can reduce the influence of impurities and improve the sample preparation effect. Then, the discharge amount of the calcareous sand is controlled by the solenoid valve 1121 on the surface of the feed pipe 112, and the calcareous sand is discharged into the first mold shell 72 and the second mold shell 71 after being bonded together for molding.

[0042] When the feed shell 11 rotates, the protrusion 111 is also driven to rotate. The protrusion 111 pushes the installation rod 31 to move and stretches the second elastic member 32. When the protrusion 111 continues to rotate to cancel the push on the installation rod 31, the second elastic member 32 drives the installation rod 31 and the knocking column 311 to reset. The knocking column 311 knocks the outer wall of the forming cylinder 7, and the vibration generated by the knocking naturally precipitates and compacts the calcareous sand.

[0043] When the feed shell 11 rotates, the delivery pump 22 and the nozzle 24 are also driven to rotate. The delivery pump 22 is started, and the delivery pump 22 extracts the adhesive inside the liquid storage tank 21 and discharges the adhesive into the calcareous sand through the nozzle 24. At the same time, the rotation of the feed shell 11 drives the nozzle 24 to rotate, and the adhesive is evenly sprinkled in the calcareous sand, thereby improving the uniformity of the bonding effect. At the same time, when the knocking column 311 continuously knocks the forming cylinder 7, the adhesion effect of the adhesive can also be improved.

[0044] After the calcareous sand model is formed, the driving motor 41 can be started again to drive the knocking column 311 to continuously knock the forming cylinder 7, and the vibration of the knocking helps to separate the calcareous sand model from the first mold shell 72 and the second mold shell 71.

[0045] Then the hydraulic cylinder is started, and its telescopic end drives the mounting plate 611 to move, pushing the rack 612 to move. The rack 612 cooperates with the third gear 712 to drive the support shaft 711 and the second mold shell 71 to rotate, so that the second mold shell 71 automatically separates the first mold shell 72, making it convenient for the staff to take out the formed calcareous sand model for subsequent experimental processing, thereby improving the sample preparation efficiency.

[0046] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A sample preparation device for calcareous sand testing, comprising a base (6), a mounting frame (5) and a forming cylinder (7) arranged on the base (6), characterized in that: Also includes: A feeding assembly (1) is connected to the mounting frame (5) and is located above the forming cylinder (7), and a screen (8) is provided in the feeding assembly (1); a spraying assembly (2), connected to the feeding assembly (1), for spraying the adhesive into the forming cylinder (7); A knocking assembly (3) is provided on the base (6), the knocking assembly (3) corresponds to the forming cylinder (7) and can abut against the feeding assembly (1); A driving assembly (4) is provided on the mounting frame (5), and the driving assembly (4) is connected to the feeding assembly (1) to enable the feeding assembly (1) to partially rotate, so that the screen (8) moves back and forth in the horizontal direction, and the knocking assembly (3) knocks the outer wall of the forming cylinder (7) back and forth.

2. The sample preparation device for calcareous sand testing according to claim 1, characterized in that: The feed assembly (1) comprises: A fixing ring (12), the outer peripheral wall of which is fixedly connected to the mounting frame (5), and the inner peripheral wall of the fixing ring (12) is provided with a plurality of inclined blocks (121) spaced in an annular manner; A feed shell (11) is connected to the drive assembly (4); the screen (8) is provided inside the feed shell (11); one end of the screen (8) is fixedly connected to a movable body (82); the movable body (82) is movably arranged in the feed shell (11); the movable body (82) is connected to a first elastic member (821); and the first elastic member (821) is fixedly connected to the inner wall of the feed shell (11); A movable body (81) is movably arranged in the feed shell (11), one end of the movable body (81) is provided with an abutting wheel (811) capable of abutting against a plurality of the inclined blocks (121), and the other end of the movable body (81) is fixedly connected to the other end of the screen (8).

3. The sample preparation device for calcareous sand testing according to claim 2, characterized in that: The outer peripheral wall of the feed shell (11) is provided with a plurality of protrusions (111) spaced in an annular manner, and the knocking assembly (3) comprises: A fixing seat (33) is provided on the base (6); A mounting rod (31), one end of which is rotatably connected to the fixing seat (33) and the other end of which is capable of abutting against the protrusion (111); A second elastic member (32), both ends of which are fixedly connected to the forming cylinder (7) and the mounting rod (31); A knocking column (311) is fixedly connected to the mounting rod (31) and corresponds to the outer wall of the forming cylinder (7).

4. The sample preparation device for calcareous sand testing according to claim 2, characterized in that: The spray assembly (2) comprises: a liquid storage tank (21) fixedly connected to the feed shell (11), wherein the adhesive is provided inside the liquid storage tank (21); a delivery pump (22) fixedly connected to the feed shell (11); a nozzle (24) fixedly connected to the outer wall of the feed shell (11) and facing the interior of the forming cylinder (7); a liquid extraction pipe (25), one end of which extends into the liquid storage tank (21) and the other end of which is connected to the delivery pump (22); The delivery pipe (23) has two ends connected to the delivery pump (22) and the nozzle (24) respectively.

5. The sample preparation device for calcareous sand testing according to claim 2, characterized in that: The driving assembly (4) comprises: A drive motor (41) is fixedly connected to the mounting frame (5), and an output shaft of the drive motor (41) passes through the mounting frame (5); A first gear (42) is fixedly connected to the output shaft of the driving motor (41); A driving rod (45) is rotatably provided through the mounting frame (5); a second gear (43) fixedly connected to one end of the driving rod (45) and meshing with the first gear (42); The rotating frame (44) is fixedly connected to the other end of the driving rod (45), and the portion of the rotating frame (44) away from the driving rod (45) is fixedly connected to the inner wall of the feed shell (11).

6. The sample preparation device for calcareous sand testing according to claim 1, characterized in that: The molding cylinder (7) comprises a first mold shell (72) and a second mold shell (71); the first mold shell (72) is fixedly mounted on the base (6); one side of the first mold shell (72) is rotatably connected to a support shaft (711); and the second mold shell (71) is fixedly connected to the support shaft (711); One end of the support shaft (711) is fixedly connected to a third gear (712), the lower surface of the base (6) is fixedly connected to a hydraulic cylinder, the telescopic end of the hydraulic cylinder is connected to a rack (612), and the rack (612) is meshed with the third gear (712).

7. The sample preparation device for calcareous sand testing according to claim 6, characterized in that: A vertical plate (722) is movably provided at the bottom of the first mold shell (72), one end of the vertical plate (722) is connected to the chassis (721), and the other end is connected to a pulley (7221); The telescopic end of the hydraulic cylinder is connected to a mounting plate (611), and the mounting plate (611) has an inclined surface that abuts against the pulley (7221).

8. The sample preparation device for calcareous sand testing according to claim 2, characterized in that: The inner wall of the feed shell (11) is fixedly connected to a guide shell (113) located above the screen (8), and the guide shell (113) is arranged in a trumpet shape.

9. The sample preparation device for calcareous sand testing according to claim 2, characterized in that: A feed pipe (112) communicating with the interior of the feed shell (11) is provided at the bottom of the feed shell (11), and the feed pipe (112) is provided with a solenoid valve (1121).

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