In-situ preparation device and method for sprayed concrete sample

Abstract

The invention discloses an in-situ preparation device and method for a sprayed concrete sample, and belongs to the technical field of concrete sample preparation devices. The spraying mechanism comprises a connecting base detachably connected with the mold cylinder, a plurality of spraying assemblies are arranged on the connecting base, the discharging ends of the spraying assemblies face the interior of the mold cylinder, a first driving assembly is arranged on the connecting base, and the first driving assembly drives the multiple spraying assemblies to do circumferential reciprocating rotation around the axis of the mold cylinder; the feeding mechanism comprises a feeding opening formed in the side wall of the mold cylinder, a conveying ramp is detachably connected to the feeding opening, an adjusting mechanism used for adjusting the inclination angle of the conveying ramp is arranged on one side of the conveying ramp, and a feeding assembly is arranged at the high end of the conveying ramp; and the vibrating assembly is used for vibrating the materials in the mold cylinder. According to the device, in-situ preparation of a sample can be achieved, when concrete slurry is added, an accelerator is rotationally sprayed, the spraying uniformity is improved, and the compactness and uniformity of concrete with the accelerator added are improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete sample preparation devices, and in particular to an in-situ preparation device and method for a shotcrete sample. Background Art

[0002] Shotcrete is a type of concrete that uses accelerators as additives and can solidify and harden in a short period of time. It is mostly applied in engineering projects using the spraying process. There are currently two methods for preparing shotcrete test blocks: one is to cut and sample the large plate after spraying, and the other is to cast and mold it after manual mixing. The former is completed by on-site spraying machinery, which requires a large amount of raw materials, is costly, and requires a large amount of engineering work; the latter is because the concrete solidifies too quickly after the addition of the accelerator and there is no time for pouring, so it is impossible to prepare a complete test block. Therefore, existing standards often simplify concrete into mortar, add accelerators into it for test block preparation, and the test results deviate greatly from the actual performance of concrete; this greatly limits the optimization design of shotcrete mix ratios and the detection of true performance.

[0003] Therefore, an in-situ preparation device and method for shotcrete specimens are proposed. Summary of the invention

[0004] The object of the present invention is to provide an in-situ preparation device and method for shotcrete specimens, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides an in-situ preparation device for a shotcrete sample, comprising:

[0006] mold cylinder;

[0007] The spraying mechanism comprises a connection seat detachably connected to the mold barrel, a plurality of spraying assemblies are arranged on the connection seat, the discharge end of the spraying assemblies faces the interior of the mold barrel, and a first driving assembly is arranged on the connection seat, and the first driving assembly drives the plurality of spraying assemblies to reciprocate around the axis of the mold barrel;

[0008] A feeding mechanism, comprising a feeding port provided on the side wall of the mold barrel, a conveying ramp being detachably connected to the feeding port, an adjusting mechanism for adjusting the inclination angle of the conveying ramp being provided on one side of the conveying ramp, and a feeding assembly being provided at the high end of the conveying ramp;

[0009] A vibrating assembly is used to vibrate the material in the mold barrel.

[0010] Preferably, the top of the mold cylinder is open, a plurality of guide columns are fixedly connected to the top of the mold cylinder, the connecting seat is annular and has a plurality of guide holes at the bottom, the guide columns are in sliding contact with the guide holes, a positioning hole is provided on the guide columns, a first sliding groove is provided on the side wall of the guide hole, a positioning column is slidingly connected in the first sliding groove, the positioning column is in sliding contact with the positioning hole, and a second driving mechanism is provided on the connecting seat which is transmission-connected to the plurality of positioning columns.

[0011] Preferably, the outer side wall of the connecting seat protrudes outward to form a boss, and the second driving mechanism includes a plurality of rotating shafts rotatably connected to the bottom of the boss, the plurality of rotating shafts are arranged in a one-to-one correspondence with the plurality of positioning posts, and the rotating shafts are transmission-connected to the positioning posts through a transmission assembly;

[0012] A first cavity is defined in the connection seat, the rotating shaft extends into the first cavity and is fixedly connected with a first gear, a gear ring is rotatably connected in the connection seat, the first gear is meshed with the gear ring, and a driving assembly is transmission-connected to the gear ring.

[0013] Preferably, the transmission assembly includes a connecting rod fixedly connected to the rotating shaft, the positioning column passes through the side wall of the connecting seat and is fixedly connected to a slider, a second sliding groove slidably connected to the slider is provided at the bottom of the boss, a positioning pin is fixed to the slider, and a long hole is provided at the end of the connecting rod away from the rotating shaft, and the positioning pin is slidably connected to the long hole.

[0014] Preferably, a mounting ring is fixedly connected to the top of the connecting seat, and the inner ring of the mounting ring is rotatably connected to a rotating ring. The spray assembly includes a plurality of output pipes fixedly connected to the side wall of the rotating ring, the output pipes extend into the rotating ring and are fixedly connected to an atomizing nozzle, and the output pipes are connected to the liquid delivery assembly.

[0015] Preferably, the adjustment mechanism includes a bracket arranged on one side of the mold cylinder, a lifting assembly is arranged on the bracket, two support blocks are arranged at the lifting end of the lifting assembly, pillars are fixedly connected to the opposite sides of the two support blocks, third sliding grooves are respectively opened on the two outer side walls of the conveying ramp along the length direction thereof, and the two pillars are slidably connected to the two third sliding grooves respectively.

[0016] Preferably, the feeding assembly comprises a feeding funnel fixedly connected to the supporting block, and the bottom discharge end of the feeding funnel is located above the high end of the conveying ramp.

[0017] Preferably, a U-shaped baffle with an upward opening is fixedly connected to the feeding port, a hollow column is fixedly connected to the low end of the conveying ramp, the hollow column is in contact with the inner bottom wall of the U-shaped baffle, long screw rods penetrate through both side walls of the U-shaped baffle, and the long screw rods penetrate through both side walls of the U-shaped baffle and the hollow column and are locked by nuts.

[0018] Preferably, the vibrating assembly includes a vibrating rod that extends into the mold cylinder. A top cover is arranged on the top of the rotating ring. A plurality of fixing columns are fixedly connected to the top of the rotating ring. A plurality of positioning through holes are formed in the top cover. The fixing columns penetrate through the positioning through holes, and the vibrating rod penetrates through the top cover.

[0019] A method for in-situ preparation of a shotcrete specimen is also provided, including the following steps:

[0020] Adjust the inclination angle of the conveying ramp and the rotation speed of the spraying assembly;

[0021] Prepare a concrete slurry with an appropriate dosage and prepare an appropriate amount of accelerator on the spraying assembly;

[0022] The concrete slurry enters the conveying ramp through the feeding assembly and is put into the mold cylinder. The first driving assembly drives a plurality of spraying assemblies to rotate reciprocally, so that the accelerator is evenly sprayed into the mold cylinder, and the vibrating assembly vibrates.

[0023] When the concrete slurry is delivered to about 1 cm away from the feeding port, the spraying assembly stops spraying the accelerator, and the concrete slurry is continuously put in until it reaches the height of the feeding port and then vibrates for not less than 20 s;

[0024] After vibration, take out the vibrating assembly, fill it flat to the mold feeding port, and cover it with plastic wrap;

[0025] Remove the conveying ramp and the connecting seat, and jointly transfer the mold cylinder and the concrete slurry to the bracket in the standard curing room for curing.

[0026] The present invention discloses the following technical effects: Through the feeding assembly, the concrete slurry enters the conveying ramp and is put into the mold cylinder. The first driving assembly drives a plurality of spraying assemblies to rotate reciprocally around the axis of the mold cylinder, so that the accelerator is evenly sprayed into the mold cylinder. Through the vibration of the vibrating assembly, the concrete slurry in the mold cylinder is distributed densely and evenly. In this application, the concrete slurry and the accelerator are directly added into the mold cylinder to realize the in-situ preparation of the specimen, improve the integrity of the surface forming of the specimen, and rotate and spray the accelerator while adding the concrete slurry to improve the spraying uniformity of the accelerator. By cooperating with the vibrating assembly, the compactness and uniformity of the concrete with the added accelerator are improved. Description of the Drawings

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 An exploded view of the mold barrel, the spraying mechanism and the top cover in the present invention;

[0030] Figure 3 A bottom perspective view of the connecting seat of the present invention;

[0031] Figure 4 It is a schematic diagram of an axial cross section of the connecting seat in the present invention;

[0032] Figure 5 It is a schematic diagram of a radial cross section of the connecting seat in the present invention;

[0033] Figure 6 It is an exploded view of the connecting seat and the mounting ring in the present invention;

[0034] Figure 7 It is an exploded view of the mounting ring and the rotating ring in the present invention;

[0035] Figure 8 It is an exploded view of the adjustment mechanism in the present invention;

[0036] Fig. 9 It is a schematic diagram of the installation structure of the mold cylinder and the conveying ramp in the present invention;

[0037] Fig.10 An exploded view of the mold barrel and the conveying ramp in the present invention;

[0038] Fig.11 This is an axial cross-sectional view of the connecting seat in Example 2 of the present invention.

[0039] In the figure: 1, mold cylinder; 2, connecting seat; 3, feeding port; 4, conveying ramp; 5, guide post; 6, guide hole; 7, positioning hole; 8, first chute; 9, positioning post; 10, boss; 11, rotating shaft; 12, first gear; 13, toothed ring; 14, second gear; 15, connecting rod; 16, slider; 17, second chute; 18, positioning pin; 19, long slot; 20, mounting ring; 21, rotating ring; 22, output pipe; 23, atomizing nozzle; 24, second motor; 25, third gear; 26, bracket; 27, supporting block; 28, support pillar; 29, third chute; 30, feeding funnel; 31, through slot; 32, third motor; 33, lead screw; 34, U-shaped baffle; 35, hollow column; 36, through hole; 37, long screw; 38, nut; 39, vibrating rod; 40, top cover; 41, fixing column; 42, positioning through hole; 43, avoidance hole; 44, pressure sensor. Specific embodiments

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0042] Embodiment 1

[0043] Referring to Figure 1-Figure 10 , the present invention provides an in-situ preparation device for shotcrete specimens, including:

[0044] A mold cylinder 1; a through hole is opened at the center of the bottom of the mold cylinder 1 to facilitate subsequent demolding.

[0045] A spraying mechanism, the spraying mechanism includes a connecting seat 2 detachably connected to the mold cylinder 1, a plurality of spraying components are arranged on the connecting seat 2, the plurality of spraying components are evenly arranged circumferentially along the axis of the mold cylinder 1, the discharge end of the spraying component faces the inside of the mold cylinder, and a first driving component is arranged on the connecting seat 2, and the first driving component is used to drive the plurality of spraying components to rotate reciprocally around the axis of the mold cylinder 1;

[0046] A feeding mechanism, the feeding mechanism includes a feeding port 3 opened on the side wall of the mold cylinder 1, a conveying ramp 4 is detachably connected to the feeding port 3, an adjusting mechanism for adjusting its inclination angle is arranged on one side of the conveying ramp 4, and a feeding component is arranged at the high end of the conveying ramp 4;

[0047] A vibrating assembly, used to vibrate the material in the mold barrel 1;

[0048] Through the feeding component, the concrete slurry enters the conveying ramp 4 and is put into the mold tube 1. The first driving component drives multiple spraying components to reciprocate around the axis of the mold tube 1, so that the quick-setting agent is evenly sprayed into the mold tube 1. Through the vibration component, the concrete slurry in the mold tube 1 is vibrated to make it dense and uniform.

[0049] Further optimization scheme, the top of the mold tube 1 is open, and multiple guide columns 5 are fixedly connected to the top of the mold tube 1 in the circumferential direction. The connecting seat 2 is annular and has multiple guide holes 6 at the bottom. The multiple guide columns 5 are arranged one by one with the multiple guide holes 6 and are in sliding contact. The guide columns 5 are provided with positioning holes 7, and the side walls of the guide holes 6 are provided with first slide grooves 8. The first slide grooves 8 are slidably connected with positioning columns 9, and the positioning columns 9 are in sliding contact with the positioning holes 7. The connecting seat 2 is provided with a second driving mechanism that is transmission-connected to the multiple positioning columns 9. The connecting seat 2 is annular, and the inner ring is consistent in size with the inner wall of the mold tube 1;

[0050] The outer wall of the connecting seat 2 protrudes outward to form a boss 10, and the second driving mechanism includes a plurality of rotating shafts 11 rotatably connected to the bottom of the boss 10. The plurality of rotating shafts 11 are arranged one by one corresponding to the plurality of positioning columns 9, and the rotating shafts 11 are transmission-connected to the positioning columns 9 through a transmission assembly; there is a certain gap between the bottom of the boss 10 and the top of the mold cylinder 1;

[0051] A first cavity is defined in the connection base 2, the rotating shaft 11 extends into the first cavity and is fixedly connected to a first gear 12, an annular cavity connected to the first cavity is defined in the connection base 2, a gear ring 13 is rotatably connected in the annular cavity, the first gear 12 is meshed with the gear ring 13, and a driving assembly is provided on the gear ring 13.

[0052] The driving assembly includes a first motor fixedly embedded in the connecting seat 2, a second gear 14 is fixedly connected to the output shaft of the first motor, and the second gear 14 is meshed with the ring gear 13;

[0053] The transmission assembly includes a connecting rod 15 fixedly connected to the rotating shaft 11, a positioning column 9 passes through the side wall of the connecting seat 2 and is fixedly connected to a slider 16, a second sliding groove 17 slidably connected to the slider 16 is provided at the bottom of the boss 10, a positioning pin 18 is fixed to the slider 16, and a long hole 19 is provided at the end of the connecting rod 15 away from the rotating shaft 11, and the positioning pin 18 is slidably connected to the long hole 19.

[0054] When in use, align the guide hole 6 on the connecting seat 2 with the guide column 5, place the connecting seat 2 on the mold cylinder 1, insert the guide column 5 into the guide hole 6, radially position the connecting seat 2, and then drive the second gear 14 to rotate through the first motor, thereby driving the ring gear 13 to rotate, and then driving the rotating shaft 11 on the first gear 12 to rotate, so that the positioning pin 18 slides in the elongated hole 19, and at the same time, the slider 16 on the positioning pin 18 is driven to slide along the second slide groove 17 through the elongated hole 19, so that the positioning column 9 slides into the positioning hole 7, and the connecting seat 2 is axially positioned.

[0055] Further optimized solution, the top of the connecting seat 2 is fixedly connected with a mounting ring 20, the inner ring of the mounting ring 20 is rotatably connected with a rotating ring 21, the spraying assembly includes a plurality of output pipes 22 fixedly connected to the side wall of the rotating ring 21, the output pipes 22 extend into the rotating ring 21 and are fixedly connected with an atomizing nozzle 23, and the output pipes 22 are connected with the liquid delivery assembly;

[0056] The liquid delivery component includes an external storage bottle, a liquid pump is fixedly connected to the storage bottle, and a plurality of delivery hoses are fixedly connected to the liquid outlet of the liquid pump, and the delivery hoses are fixedly connected and communicated with the output pipe 22. The first driving component includes a second motor 24 fixedly connected to the top of the mounting ring 20, a receiving groove is provided on the inner side wall of the mounting ring 20, the output shaft of the second motor 24 extends into the receiving groove and is fixedly connected to the third gear 25, and a tooth groove is provided on the outer ring of the rotating ring 21, and the third gear 25 meshes with the tooth groove; the height of the rotating ring 21 is higher than the height of the mounting ring 20, and the output pipe 22 is located on the upper side of the mounting ring 20;

[0057] When in use, the atomizing nozzle 23 is located on the upper side of the feeding port 3, the accelerator is added to the external storage bottle, and the accelerator is pumped into the atomizing nozzle 23 by a liquid pump for spraying. While spraying, the third gear 25 is driven to rotate by the second motor 24, thereby driving the rotating ring 21 to reciprocate. The reciprocating rotation is controlled at an angle, and the output pipe 22 is rotated to the top of the conveying ramp 4 and then reversed without crossing the conveying ramp 4. When it is rotated to the top of the conveying ramp 4, a part of the conveying hose connected to the output pipe 22 is placed on the conveying ramp 4, and at the same time, the spraying uniformity can be improved.

[0058] Further optimized scheme, the adjustment mechanism includes a bracket 26 arranged on one side of the mold barrel 1, a lifting assembly is arranged on the bracket 26, two blocks 27 are arranged at the lifting end of the lifting assembly, pillars 28 are fixedly connected to the opposite sides of the two blocks 27, and third slide grooves 29 are respectively opened on the two outer side walls of the conveying ramp 4 along its length direction, and the two pillars 28 are respectively slidably connected to the two third slide grooves 29; the feeding assembly includes a feeding funnel 30 fixedly connected to the support, and the bottom discharge end of the feeding funnel 30 is located above the high end of the conveying ramp 4;

[0059] Through slots 31 are respectively formed in the two vertical rods of the support 26. The lifting assembly includes a third motor 32 fixedly connected in the through slot 31. A lead screw 33 is fixedly connected to the output shaft of the third motor 32. The lead screw 33 is rotatably connected to the through slot 31. A support block 27 is threadedly sleeved outside the lead screw 33. The support block 27 is slidably connected to the through slot 31;

[0060] A U-shaped baffle 34 is fixedly connected to the feeding port 3. The opening of the U-shaped baffle 34 faces. The low end of the conveying ramp 4 is located inside the U-shaped baffle 34. A hollow column 35 is fixedly connected to the low end of the conveying ramp 4. The hollow column 35 contacts the inner bottom wall of the U-shaped baffle 34. Through holes 36 are respectively formed in the two side walls of the U-shaped baffle 34. A long screw 37 passes through the through holes 36. The long screw 37 passes through the two through holes 36 and the hollow column 35 and is locked by a nut 38;

[0061] When the inclination angle needs to be adjusted, start the third motor 32 to drive the support block 27 to move up and down, so that the support column 28 slides in the third chute 29, thereby realizing the adjustment of the slope of the conveying ramp 4. By adjusting the slope, the feeding speed of the slurry is adjusted. When the support block 27 moves up and down, the feeding funnel 30 moves up and down synchronously, avoiding too large a distance between the feeding funnel 30 and the conveying ramp 4.

[0062] In a further optimized solution, the vibrating assembly includes but is not limited to forms such as vibrating rods, vibrating paddles, vibrating pumps, vibrating rulers, etc. In this embodiment, the vibrating rod 39 is taken as an example for illustration. The vibrating assembly includes a vibrating rod 39. The vibrating rod 39 is electrically connected to an external power supply through a wire. The vibrating rod 39 extends into the mold cylinder 1. A top cover 40 is arranged on the top of the rotating ring 21. A plurality of fixing columns 41 are fixedly connected to the top of the rotating ring 21. A plurality of positioning through holes 42 are formed in the top cover 40. The fixing columns 41 pass through the positioning through holes 42. An avoidance hole 43 is formed in the top cover 40. The vibrating rod 39 passes through the avoidance hole 43. A gap is arranged between the avoidance hole 43 and the vibrating rod 39;

[0063] The vibrating rod 39 can adjust the vibration frequency; by arranging the top cover 40, the top cover 40 covers the rotating ring 21, so that material splashing can be avoided during feeding and vibrating.

[0064] An in-situ preparation method for a shotcrete specimen includes the following steps:

[0065] Adjust the inclination angle of the conveying ramp 4, and adjust the parameters of the first driving assembly to adjust the rotation speed of the spraying assembly;

[0066] Prepare a concrete slurry with a suitable dosage and prepare an appropriate amount of accelerator on the spraying assembly;

[0067] The concrete slurry enters the conveying ramp 4 through the feeding assembly and is put into the mold cylinder 1. The first driving assembly drives a plurality of spraying assemblies to rotate reciprocally, so that the accelerator is evenly sprayed into the mold cylinder 1, and the vibrating assembly vibrates;

[0068] When the concrete slurry is delivered to about 1 cm from the lower end of the feeding port 3, the spraying assembly stops spraying the accelerating agent, and continues to deliver the concrete slurry to the height of the feeding port 3 and then continue to vibrate for no less than 20 seconds;

[0069] After the vibration is completed, take out the vibration assembly, fill it to the mold feeding port 3, and cover it with plastic wrap;

[0070] Remove the conveying ramp 4 and the connecting seat 2, and transfer the mold cylinder 1 and the concrete slurry to the bracket 26 of the standard curing room for curing.

[0071] The specific usage is as follows:

[0072] The third motor 32 is used to adjust the inclination angle of the conveying ramp 4, and the parameters of the second motor 24 are adjusted to determine the rotation speed of the atomizing nozzle 23;

[0073] Prepare a suitable amount of concrete slurry according to the requirements of shotcrete, and test its slump and slump expansion; prepare a suitable amount of accelerating agent to an external storage bottle, start the liquid pump, and ensure that the accelerating agent has been transported to the section where the atomizing nozzle 23 is located; ensure that the accelerating agent can be sprayed immediately at the beginning of the experiment;

[0074] The vibrating rod 39 is connected to an external power supply, the vibration frequency of the vibrating rod 39 is set to 20 Hz, and inserted into the mold tube 1 at a position 1 to 2 cm away from the bottom surface;

[0075] The liquid pump is turned on and the second motor 24 is rotated to spray the accelerating setting agent, and the prepared concrete slurry is poured into the feeding funnel 30, and the concrete is added to the inner cavity of the mold tube 1 through the conveying ramp 4. At this time, it can be observed that the concrete passes through the upper opening of the mold tube 1 at a uniform speed, and the accelerating setting agent is sprayed on its surface in a mist form. Both enter the mold tube 1 at the same time and are vibrated by the vibrating rod 39; before the test begins, the inner wall of the concrete mold tube 1 needs to be cleaned and oiled;

[0076] When the concrete slurry is delivered to about 1 cm from the lower end of the feeding port 3, the liquid pump is stopped, the frequency of the vibrating rod 39 is adjusted to 50 Hz, and the concrete is continued to be added to a height higher than the feeding port 3 and then vibrated for at least 20 seconds;

[0077] After the vibration is completed, slowly pull out the vibrating rod 39, fill it up to the mold feeding port 3, and cover it with plastic wrap; the whole process from concrete delivery to film coating takes 1 minute; remove the delivery ramp 4 and the connecting seat 2, and transfer the mold cylinder 1 and the concrete slurry to the bracket of the standard curing room for curing, ensuring the spacing requirements and surface moisture;

[0078] After curing and molding according to standard curing conditions, concrete specimens can be obtained.

[0079] Example 2

[0080] The difference from Example 1 is that a pressure sensor 44 is fixedly connected to the top of the guide hole 6, a spring is fixedly connected to the bottom of the pressure sensor 44, and multiple pressure sensors 44 are electrically connected to a controller. When the connecting seat 2 is placed, the guide column 5 is inserted into the guide hole 6 and squeezes the spring. When the connecting seat 2 is completely placed on the top of the mold cylinder 1, each spring is squeezed to the same extent. At this time, each pressure sensor 44 senses the pressure value within the target range and transmits the pressure value to the controller. The controller controls the first motor to start, so that the positioning column 9 slides into the positioning hole 7. After the positioning column 9 slides into the positioning hole 7, there is a certain gap between the bottom of the positioning column 9 and the bottom of the positioning hole 7.

[0081] Only when each pressure sensor 44 senses a pressure value within the target range, it means that the connecting seat 2 has been stably placed on the top of the mold cylinder 1, and the controller will control the first motor to start; when the connecting seat 2 needs to be removed, the connecting seat 2 is lifted upward, and the bottom of the positioning column 9 contacts the bottom of the positioning hole 7, and each spring is extended to a certain length. At this time, the pressure of each pressure sensor 44 drops to the target range, and the controller controls the first motor to start, so that the positioning column 9 slides out of the positioning hole 7; when the spring expands and contracts unevenly in a small range due to vibration, the controller will not prevent the positioning column 9 from sliding out of the positioning hole 7.

[0082] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0083] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An in-situ preparation device for shotcrete specimens, characterized in that: include: Mold cylinder (1); The spraying mechanism comprises a connection seat (2) detachably connected to the mold barrel (1), a plurality of spraying assemblies being arranged on the connection seat (2), the discharge ends of the spraying assemblies facing the interior of the mold barrel (1), and a first driving assembly being arranged on the connection seat (2), the first driving assembly driving the plurality of spraying assemblies to reciprocate around the axis of the mold barrel (1); A feeding mechanism, comprising a feeding port (3) provided on the side wall of the mold barrel (1), a conveying ramp (4) being detachably connected to the feeding port (3), an adjusting mechanism for adjusting the inclination angle of the conveying ramp (4) being provided on one side thereof, and a feeding assembly being provided at the high end of the conveying ramp (4); A vibrating assembly is used to vibrate the material in the mold barrel (1).

2. The in-situ preparation device for shotcrete specimen according to claim 1, characterized in that: The top of the mold cylinder (1) is open, and a plurality of guide columns (5) are fixedly connected to the top of the mold cylinder (1). The connecting seat (2) is annular and has a plurality of guide holes (6) at the bottom. The guide columns (5) are in sliding contact with the guide holes (6). A positioning hole (7) is provided on the guide column (5). A first sliding groove (8) is provided on the side wall of the guide hole (6). A positioning column (9) is slidably connected in the first sliding groove (8). The positioning column (9) is in sliding contact with the positioning hole (7). The connecting seat (2) is provided with a second driving mechanism that is transmission-connected to the plurality of positioning columns (9).

3. The in-situ preparation device for shotcrete specimen according to claim 2, characterized in that: The outer wall of the connecting seat (2) protrudes outward to form a boss (10), the second driving mechanism comprises a plurality of rotating shafts (11) rotatably connected to the bottom of the boss (10), the plurality of rotating shafts (11) are arranged in a one-to-one correspondence with the plurality of positioning columns (9), and the rotating shafts (11) are transmission-connected to the positioning columns (9) via a transmission assembly; A first cavity is defined in the connection seat (2), the rotating shaft (11) extends into the first cavity and is fixedly connected to a first gear (12), a gear ring (13) is rotatably connected in the connection seat (2), the first gear (12) is meshed with the gear ring (13), and a driving assembly is transmission-connected to the gear ring (13).

4. The in-situ preparation device for shotcrete specimen according to claim 3, characterized in that: The transmission assembly comprises a connecting rod (15) fixed to the rotating shaft (11); the positioning column (9) passes through the side wall of the connecting seat (2) and is fixedly connected to a sliding block (16); a second sliding groove (17) slidably connected to the sliding block (16) is provided at the bottom of the boss (10); a positioning pin (18) is fixedly connected to the sliding block (16); an elongated hole (19) is provided at one end of the connecting rod (15) away from the rotating shaft (11); and the positioning pin (18) is slidably connected to the elongated hole (19).

5. The in-situ preparation device for shotcrete specimen according to claim 1, characterized in that: A mounting ring (20) is fixedly connected to the top of the connecting seat (2); the inner ring of the mounting ring (20) is rotatably connected to a rotating ring (21); the spraying assembly comprises a plurality of output pipes (22) fixedly connected to the side wall of the rotating ring (21); the output pipes (22) extend into the rotating ring (21) and are fixedly connected to an atomizing nozzle (23); and the output pipes (22) are connected to a liquid delivery assembly.

6. The in-situ preparation device for shotcrete specimen according to claim 1, characterized in that: The adjusting mechanism includes a bracket (26) arranged on one side of the mold cylinder (1). A lifting assembly is arranged on the bracket (26). Two blocks (27) are arranged at the lifting end of the lifting assembly. Pillars (28) are fixedly connected to the opposite sides of the two blocks (27). Third sliding grooves (29) are respectively formed in the two outer side walls of the conveying ramp (4) along its length direction. The two pillars (28) are respectively slidably connected to the two third sliding grooves (29).

7. The in-situ preparation device for shotcrete specimen according to claim 6, characterized in that: The feeding assembly includes a feeding funnel (30) fixedly connected to the block (27). The bottom discharge end of the feeding funnel (30) is located above the high end of the conveying ramp (4).

8. The in-situ preparation device for shotcrete specimens according to claim 7, characterized in that: An upward-opening U-shaped baffle (34) is fixedly connected to the feeding port (3). A hollow column (35) is fixedly connected to the low end of the conveying ramp (4). The hollow column (35) is in contact with the inner bottom wall of the U-shaped baffle (34). Long screw rods (37) penetrate through the two side walls of the U-shaped baffle (34). The long screw rods (37) penetrate through the two side walls of the U-shaped baffle (34) and the hollow column (35) and are locked by nuts (38).

9. The in-situ preparation device for shotcrete specimen according to claim 5, characterized in that: The vibrating assembly includes a vibrating rod (39). The vibrating rod (39) extends into the mold cylinder (1). A top cover (40) is arranged at the top of the rotating ring (21). A plurality of fixed columns (41) are fixedly connected to the top of the rotating ring (21). A plurality of positioning through holes (42) are formed in the top cover (40). The fixed columns (41) penetrate through the positioning through holes (42). The vibrating rod (39) penetrates through the top cover (40).

10. An in-situ preparation method for a shotcrete sample, using the in-situ preparation device for a shotcrete sample according to any one of claims 1 to 9, characterized in that: It includes the following steps: Adjust the inclination angle of the conveying ramp (4) and adjust the rotation speed of the spraying assembly; Prepare a concrete slurry with a suitable dosage and prepare an appropriate amount of quick-setting agent on the spraying assembly; The concrete slurry enters the conveying ramp (4) through the feeding assembly and is put into the mold cylinder (1). The first driving assembly drives a plurality of spraying assemblies to rotate reciprocally, so that the quick-setting agent is evenly sprayed into the mold cylinder (1), and the vibrating assembly vibrates; When the concrete slurry is fed to about 1 cm away from the feeding port (3), the spraying assembly stops spraying the quick-setting agent, and continue to put the concrete slurry until it reaches the height of the feeding port (3) and then continue vibrating for no less than 20 s; After vibration is completed, take out the vibrating assembly, fill it flat to the mold feeding port (3), and cover it with plastic wrap; Remove the conveying ramp (4) and the connecting seat (2), and jointly transfer the mold cylinder (1) and the concrete slurry to the bracket in the standard curing room for curing.

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