Surface strengthening device and method for low-density recycled aggregate

Abstract

The present invention belongs to the technical field of comprehensive utilization of waste resources and production of building materials, and discloses a surface strengthening device and method for low-density recycled aggregate. The surface strengthening device for low-density recycled aggregate comprises a body, a feeding port is provided at the top of the body, a discharge port is provided in the middle of the bottom wall of the body, and a block is connected to the inner thread of the discharge port, and a drainage pipe is fixedly connected and equipped with a switch valve at the bottom of the body and on both sides of the discharge port, and a base is installed at the bottom of the body. The surface strengthening device and method for low-density recycled aggregate are different from the traditional drum processing method through the design of the transmission mechanism and the scattering mechanism, and the impact generated by the scattering is used to process the recycled aggregate so that the mortar on its surface falls off. Compared with the same material processing device, the present device has a smaller volume, and can also process the aggregate during the transmission process, thereby enhancing the strengthening effect and being more efficient, thus solving the problems raised in the background technology.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of waste resources and production of building materials, and in particular to a surface strengthening device and method for low-density recycled aggregate. Background Art

[0002] Recycled concrete aggregate is a recyclable green building material, obtained by crushing waste concrete blocks generated by construction and demolition, and used to partially or completely replace natural aggregate in fresh concrete. However, the surface of the recycled aggregate obtained by simply crushing the waste concrete is attached with hardened cement paste, which usually contains a certain amount of pores and a large amount of hydrated calcium silicate gel, making the recycled aggregate have high water absorption and low strength. The concrete prepared with recycled aggregate has higher water absorption and shrinkage, which will seriously affect the structural strength.

[0003] The methods for removing mortar attached to recycled aggregates mainly include: mechanical treatment, heat treatment, pickling, etc. Mechanical treatment is the most commonly used treatment method, and heat treatment and pickling are usually implemented in combination with mechanical treatment. The combined method is a simple sequential processing, which is difficult to carry out efficient combined processing. Today's mechanical processing equipment is usually a drum structure with a large volume. In addition, its actual processing is mainly in the process of aggregate falling from a high place. The lifting time accounts for a large proportion and the processing efficiency is low. Therefore, we proposed a surface strengthening device for low-density recycled aggregates. Summary of the invention

[0004] The purpose of the present invention is to provide a surface strengthening device and method for low-density recycled aggregate, which solves the problems raised in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a surface strengthening device for low-density recycled aggregate, including a body, a feeding port is opened on the top of the body, a discharge port is opened in the middle of the bottom wall of the body, and a block is connected to the inner thread of the discharge port, the bottom of the body and both sides of the discharge port are fixedly connected with a drainage pipe and equipped with a switch valve, a base is installed at the bottom of the body, a driving motor is fixedly installed on the top of the body, a conveying mechanism is arranged in the body for aggregate transportation, and a scattering mechanism is also arranged in the body for aggregate processing.

[0006] Preferably, the conveying mechanism includes a center tube, a connecting rod, a rotating shaft, a connecting block, a spiral blade and a screening assembly. The center tube is fixedly connected to the machine body by two sets of upper and lower connecting rods, and the axis of the center tube coincides with the axis of the machine body. The top of the rotating shaft is fixedly connected to the output end of the driving motor, the connecting block is at the bottom of the rotating shaft, and the bottom end of the rotating shaft is movably connected to a circular groove on the connecting block through a bearing. The rotating shaft is provided with spiral blades for material conveying, and the bottom of the connecting block contacts the upper surface of the blocking block. A number of annularly arranged screening assemblies are movably connected between the connecting block and the inner wall of the machine body for aggregate screening.

[0007] Preferably, the screening assembly includes a frame, a screen plate, a slot, a tension spring and an insertion rod, the screen plate is arranged in the frame, the frame is triangular and its bottom wall is movably connected to the inner wall of the body, the end of the frame away from the body is inclined downward and has a slot, one end of the insertion rod is connected to the slot through a tension spring, and the other end of the insertion rod is movably connected to the groove at the corresponding position of the side wall of the connecting block.

[0008] Preferably, the inner wall cross-section of the machine body is a regular polygon, and the screening components are arranged in a ring shape with the axis of the rotating shaft as a reference, and adjacent frames are connected by connecting cloth.

[0009] Preferably, the scattering mechanism includes an annular box, a scattering tube, an annular shell, a collision cone and a support rod, the annular box is movably connected to the top end of the outside of the central tube through bearing 2, the rotating shaft is fixedly connected to the annular box through a plurality of support rods, the top of the annular box is open, a plurality of scattering tubes are installed at the bottom of the outer wall of the annular box and are connected to the inside of the annular box, the annular shell is fixedly connected to the position of the inner wall of the machine body corresponding to the annular box, and the inner wall of the annular shell is provided with evenly distributed collision cones for knocking off low-density mortar on the surface of the aggregate.

[0010] Preferably, the collision cone is in the shape of a triangular cone, the number of the scattering pipes is not less than six and they are arranged in a ring with the axis of the central pipe as a reference, and the axis of the scattering pipe points to the axis of the central pipe.

[0011] Preferably, a water inlet pipe is fixedly connected on the side wall of the body and at the lower side of the connection between the frame and the body, a vortex tube is fixedly installed on the side wall of the body, the cold air end of the vortex tube is fixedly connected to one end of a three-way cooling pipe, the other two ends of the three-way cooling pipe pass through the body and the center tube and are connected to the inside of the center tube, and the part of the three-way cooling pipe within the body is installed in the protective groove at the bottom of the connecting rod.

[0012] Preferably, a concave annular impurity removal channel is provided at a position of the inner bottom wall of the body corresponding to the screen plate, and the annular impurity removal channel is connected to the impurity removal pipe, and the inner wall of the central pipe is provided with evenly distributed polishing bumps.

[0013] A method for using a surface strengthening device for low-density recycled aggregate, the method comprising the following steps:

[0014] S1. The pre-crushed recycled aggregate to be processed is put into the machine body through the feeding port. The recycled aggregate falls on the screening component. Water is injected into the machine body through the water inlet pipe to make it cover the screen plate. High-speed airflow is introduced into the vortex tube to generate ultra-low temperature airflow to enter the central tube, and the injected water is pre-cooled at the same time;

[0015] S2. Start the drive motor to drive the rotating shaft and the annular box to rotate. The recycled aggregate after being soaked in water is transported upward by the spiral blades and quickly frozen by the cold air in the central tube. The water in its holes freezes quickly and expands, making it easier to peel off. It is discharged into the annular box through the top of the central tube and then thrown out at high speed through the throwing pipe under the centrifugal effect and hits the collision cone. The low-density mortar falls off and the recycled aggregate falls on the screen plate. It circulates continuously within the processing time limit. After the processing is completed, the drainage pipe is opened to discharge the water and peeled mortar in the machine body, the blocking block is unscrewed, the connecting block falls under pressure, the plug rod is extended, and the aggregate falls through the gap between the frame and the connecting block and is discharged from the machine body through the discharge port to complete the processing.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The surface strengthening equipment and method of low-density recycled aggregate are different from the traditional drum processing method through the design of the transmission mechanism and the scattering mechanism. The recycled aggregate is processed by the impact generated by the scattering to make the mortar on its surface fall off. Compared with the equipment for processing the same material, the present equipment is smaller in size and can also process the aggregate during the transmission process, thereby enhancing the strengthening effect and being more efficient, thus solving the problems raised in the background technology.

[0018] 2. The surface strengthening device and method of the low-density recycled aggregate, through the design of the vortex tube, can utilize the water freezing collision to destroy the porous structure of the mortar, making it easier to peel off the recycled aggregate when it collides with the collision cone later, thereby enhancing the strengthening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front cross-sectional view of the present invention;

[0020] Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 A top view of the screening assembly of the present invention in a closed state;

[0022] Figure 4 It is a top view of the screening assembly of the present invention in the open state.

[0023] In the figure: 1 body, 2 feeding port, 3 discharging port, 4 blocking block, 5 impurity discharge pipe, 6 base, 7 driving motor, 8 conveying mechanism, 81 central pipe, 82 connecting rod, 83 rotating shaft, 84 connecting block, 85 spiral blade, 86 screening component, 861 frame, 862 screen plate, 863 slot, 864 tension spring, 865 plug rod, 9 scattering mechanism, 91 annular box, 92 scattering pipe, 93 annular shell, 94 collision cone, 95 support rod, 10 connecting cloth, 11 water inlet pipe, 12 vortex tube, 13 three-way cooling pipe, 14 protection groove, 15 annular impurity discharge channel, 16 grinding bump. DETAILED DESCRIPTION

[0024] See also Figure 1-4 The present invention provides a technical solution: a surface strengthening device for low-density recycled aggregate, comprising a body 1, a feeding port 2 is provided at the top of the body 1, a discharge port 3 is provided in the middle of the bottom wall of the body 1, and a blocking block 4 is connected to the inner thread of the discharge port 3, a discharge pipe 5 is fixedly connected to the bottom of the body 1 and on both sides of the discharge port 3 and is equipped with a switch valve, a base 6 is installed at the bottom of the body 1, a driving motor 7 is fixedly installed on the top of the body 1, a conveying mechanism 8 is provided in the body 1 for aggregate transportation, and a scattering mechanism 9 is also provided in the body 1 for aggregate processing.

[0025] The conveying mechanism 8 includes a central tube 81, a connecting rod 82, a rotating shaft 83, a connecting block 84, a spiral blade 85 and a screening assembly 86. The central tube 81 is fixedly connected to the body 1 through two sets of upper and lower connecting rods 82, and the axis of the central tube 81 coincides with the axis of the body 1. The top of the rotating shaft 83 is fixedly connected to the output end of the driving motor 7. The connecting block 84 is at the bottom of the rotating shaft 83. The bottom end of the rotating shaft 83 is movably connected to the circular groove on the connecting block 84 through a bearing. The rotating shaft 83 is provided with a spiral blade 85 for material transportation. The bottom of the connecting block 84 contacts the upper surface of the blocking block 4. A plurality of annularly arranged screening assemblies 86 are movably connected between the connecting block 84 and the inner wall of the body 1 for aggregate screening.

[0026] The screening assembly 86 includes a frame 861, a screen plate 862, a slot 863, a tension spring 864 and an insertion rod 865. The screen plate 862 is arranged in the frame 861. The frame 861 is triangular and its bottom wall is movably connected to the inner wall of the body 1. The end of the frame 861 away from the body 1 is tilted downward and has a slot 863. One end of the insertion rod 865 is connected to the slot 863 through the tension spring 864, and the other end of the insertion rod 865 is movably connected to the groove at the corresponding position of the side wall of the connecting block 84.

[0027] The inner wall cross section of the machine body 1 is in the shape of a regular polygon, and the screening components 86 are arranged in a ring shape with the axis of the rotating shaft 83 as a reference, and adjacent frames 861 are connected by a connecting cloth 10 .

[0028] The scattering mechanism 9 includes an annular box 91, a scattering pipe 92, an annular shell 93, a collision cone 94 and a support rod 95. The annular box 91 is movably connected to the top of the outside of the central tube 81 through a second bearing. The rotating shaft 83 is fixedly connected to the annular box 91 through a plurality of support rods 95. The top of the annular box 91 is open. A plurality of scattering pipes 92 are installed at the bottom of the outer wall of the annular box 91 and are connected to the inside of the annular box 91. The annular shell 93 is fixedly connected to the inner wall of the body 1 at a position corresponding to the annular box 91, and the inner wall of the annular shell 93 is provided with uniformly distributed collision cones 94 for knocking off the low-density mortar on the surface of the aggregate.

[0029] The collision cone 94 is in a triangular cone shape. The number of the scattering pipes 92 is not less than six and they are arranged in a ring with the axis of the central pipe 81 as a reference. The axis of the scattering pipe 92 points to the axis of the central pipe 81 .

[0030] A water inlet pipe 11 is fixedly connected to the side wall of the body 1 and at the lower side of the connection between the frame 861 and the body 1. A vortex tube 12 is fixedly installed on the side wall of the body 1. The cold air end of the vortex tube 12 is fixedly connected to one end of a three-way cooling pipe 13. The other two ends of the three-way cooling pipe 13 pass through the body 1 and the center tube 81 and are connected to the inside of the center tube 81. The part of the three-way cooling pipe 13 that is inside the body 1 is installed in the protective groove 14 at the lower part of the connecting rod 82.

[0031] A concave annular impurity discharge channel 15 is provided at the position of the inner bottom wall of the machine body 1 corresponding to the sieve plate 862 , and the annular impurity discharge channel 15 is communicated with the impurity discharge pipe 5 , and the inner wall of the central pipe 81 is provided with evenly distributed grinding bumps 16 .

[0032] A method for using a surface strengthening device for low-density recycled aggregate, the method comprising the following steps:

[0033] S1. The pre-crushed recycled aggregate to be processed is fed into the machine body 1 through the feeding port 2. The recycled aggregate falls on the screening assembly 86. Water is injected into the machine body 1 through the water inlet pipe 11 to cover the screen plate 862. A high-speed airflow is introduced into the vortex tube 12 to generate an ultra-low temperature airflow that enters the central tube 81, and the injected water is pre-cooled at the same time.

[0034] S2, start the driving motor 7 to drive the rotating shaft 83 and the annular box 91 to rotate, and the recycled aggregate after being soaked in water is transported upward by the spiral blades 85, and is quickly frozen by the cold air in the central tube 81. The water in its holes freezes quickly and expands, making it easier to peel off, and is discharged from the top of the central tube 81 into the annular box 91, and then is thrown out at high speed through the throwing pipe 92 under the centrifugal effect and hits the collision cone 94, and the low-density mortar falls off, and the recycled aggregate falls on the screen plate 862, and circulates continuously within the processing time limit. After the processing is completed, open the impurity discharge pipe 5 to discharge the water and the peeled mortar in the body 1, unscrew the blocking block 4, the connecting block 84 falls under pressure, and the plug rod 865 extends. The aggregate falls through the gap between the frame 861 and the connecting block 84 and is discharged from the body 1 through the discharge port 3 to complete the processing.

[0035] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surface strengthening device for low-density recycled aggregate, comprising a machine body (1), a feeding port (2) is provided at the top of the machine body (1), a discharge port (3) is provided in the middle of the bottom wall of the machine body (1), and a blocking block (4) is connected to the internal thread of the discharge port (3), a discharge pipe (5) is fixedly connected to the bottom of the machine body (1) and on both sides of the discharge port (3) and is equipped with a switch valve, and a base (6) is installed at the bottom of the machine body (1), characterized in that: A driving motor (7) is fixedly mounted on the top of the machine body (1), a conveying mechanism (8) is provided in the machine body (1) for conveying aggregates, and a scattering mechanism (9) is also provided in the machine body (1) for processing aggregates; The conveying mechanism (8) comprises a central tube (81), a connecting rod (82), a rotating shaft (83), a connecting block (84), a spiral blade (85) and a screening assembly (86); the central tube (81) is fixedly connected to the machine body (1) through two sets of upper and lower connecting rods (82); the axis of the central tube (81) coincides with the axis of the machine body (1); the top end of the rotating shaft (83) is fixedly connected to the output end of the driving motor (7); the connecting block (84) is located at the bottom of the rotating shaft (83); the bottom end of the rotating shaft (83) is movably connected to a circular groove on the connecting block (84) through a bearing; the rotating shaft (83) is provided with a spiral blade (85) for material conveying; the bottom of the connecting block (84) contacts the upper surface of the blocking block (4); a plurality of annularly arranged screening assemblies (86) are movably connected between the connecting block (84) and the inner wall of the machine body (1) for aggregate screening; The scattering mechanism (9) comprises an annular box (91), a scattering pipe (92), an annular shell (93), a collision cone (94) and a support rod (95); the annular box (91) is movably connected to the top end of the outside of the central tube (81) via a second bearing; the rotating shaft (83) is fixedly connected to the annular box (91) via a plurality of support rods (95); the top of the annular box (91) is open; a plurality of scattering pipes (92) are mounted at the bottom of the outer wall of the annular box (91) and are in communication with the inside of the annular box (91); the annular shell (93) is fixedly connected to the inner wall of the body (1) at a position corresponding to the annular box (91); and the inner wall of the annular shell (93) is provided with evenly distributed collision cones (94) for knocking off low-density mortar on the surface of the aggregate.

2. The surface strengthening device for low-density recycled aggregate according to claim 1, characterized in that: The screening assembly (86) comprises a frame (861), a screen plate (862), a slot (863), a tension spring (864) and an insertion rod (865); the screen plate (862) is arranged in the frame (861); the frame (861) is triangular in shape and its bottom wall is movably connected to the inner wall of the machine body (1); one end of the frame (861) away from the machine body (1) is tilted downward and is provided with a slot (863); one end of the insertion rod (865) is connected to the slot (863) via the tension spring (864); the other end of the insertion rod (865) is movably connected to a groove at a corresponding position of the side wall of the connecting block (84).

3. The surface strengthening device for low-density recycled aggregate according to claim 2, characterized in that: The inner wall cross-section of the machine body (1) is in the shape of a regular polygon, and the screening components (86) are arranged in a ring shape with the axis of the rotating shaft (83) as a reference, and adjacent frames (861) are connected by a connecting cloth (10).

4. The surface strengthening device for low-density recycled aggregate according to claim 3, characterized in that: The collision cone (94) is in the shape of a triangular cone. The number of the scattering tubes (92) is not less than six and they are arranged in a ring with the axis of the central tube (81) as a reference. The axis of the scattering tubes (92) points to the axis of the central tube (81).

5. The surface strengthening device for low-density recycled aggregate according to claim 4, characterized in that: A water inlet pipe (11) is fixedly connected to the side wall of the machine body (1) and at the lower side of the connection between the frame (861) and the machine body (1). A vortex tube (12) is fixedly installed on the side wall of the machine body (1). The cold air end of the vortex tube (12) is fixedly connected to one end of a three-way cooling pipe (13). The other two ends of the three-way cooling pipe (13) pass through the machine body (1) and the central pipe (81) and are connected to the inside of the central pipe (81). The part of the three-way cooling pipe (13) located inside the machine body (1) is installed in a protective groove (14) at the bottom of the connecting rod (82).

6. The surface strengthening device for low-density recycled aggregate according to claim 5, characterized in that: A concave annular impurity discharge channel (15) is provided on the inner bottom wall of the machine body (1) at a position corresponding to the sieve plate (862), and the annular impurity discharge channel (15) is connected to the impurity discharge pipe (5), and the inner wall of the central pipe (81) is provided with evenly distributed grinding bumps (16).

7. The method for using the surface strengthening device for low-density recycled aggregate according to any one of claims 1 to 6, characterized in that: The method of use comprises the following steps: S1. The pre-crushed recycled aggregate to be processed is fed into the machine body (1) through the feeding port (2). The recycled aggregate falls on the screening assembly (86). Water is injected into the machine body (1) through the water inlet pipe (11) so that the recycled aggregate does not pass through the screening plate (862). A high-speed airflow is introduced into the vortex tube (12) to generate an ultra-low temperature airflow that enters the central tube (81), and the injected water is pre-cooled at the same time. S2, start the driving motor (7) to drive the rotating shaft (83) and the annular box (91) to rotate, the water-soaked recycled aggregate is transported upward by the spiral blade (85), and is quickly frozen by the cold air in the central tube (81). The water in the holes freezes quickly and expands, making it easier to peel off, and is discharged from the top of the central tube (81) into the annular box (91). Then, under the centrifugal effect, it is thrown out at high speed through the throwing pipe (92) and hits the collision cone (94). The low-density mortar falls off, and the recycled aggregate falls on the screen plate (862). The cycle continues within the processing time limit. After the processing is completed, the impurity discharge pipe (5) is opened to discharge the water and the peeled mortar in the machine body (1), the blocking block (4) is screwed off, the connecting block (84) falls down under pressure, the plug rod (865) is extended, and the aggregate falls through the gap between the frame (861) and the connecting block (84) and is discharged from the machine body (1) through the discharge port (3), completing the processing.

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