CN111775314A - A recycled concrete mixer - Google Patents

Abstract

The invention relates to the technical field of concrete mixers, in particular to a recycled concrete mixer, comprising a mixing drum, a mixing shaft and a first motor for driving the mixing shaft to rotate. There is a feeding port and a water inlet, and a material turning mechanism is arranged in the mixing drum. The material turning mechanism includes a driving shaft rotatably connected with the mixing drum and a plurality of turning paddles fixedly connected with the driving shaft. The driving shaft is vertically arranged to turn the material The paddles are spirally distributed along the length direction of the drive shaft; the turning paddles are arranged obliquely, and the inclination direction of the turning paddles is opposite to the rotation direction of the driving shaft; a driving mechanism for driving the turning mechanism is arranged on one side of the mixing drum. The turning mechanism can turn the concrete, so that the sand and gravel are not easily deposited at the bottom of the mixing drum, which can effectively improve the uniformity of concrete mixing, and can improve the speed of concrete mixing to a certain extent, and improve the working efficiency of the mixer.

Description

A recycled concrete mixer

technical field

The invention relates to the technical field of concrete mixers, in particular to a recycled concrete mixer.

Background technique

Recycled concrete means that after crushing, cleaning, and grading waste concrete blocks, they are mixed with grading in a certain proportion, partially or completely replacing natural aggregates such as sand and gravel (mainly coarse aggregates), and then adding cement, water, etc. new concrete. According to the combination of aggregates, recycled concrete can be in the following situations: the aggregates are all recycled aggregates; the coarse aggregates are recycled aggregates, and the fine aggregates are natural sand; The material is recycled aggregate; recycled aggregate replaces part of coarse aggregate or fine aggregate.

When using recycled concrete, it is necessary to fully mix the recycled concrete to ensure that the recycled concrete has good performance.

At present, the invention patent with the publication number of CN107379255B specifically discloses a fast and uniform concrete mixer, which includes a fixed box, the bottom of the inner wall of the fixed box is fixedly connected with the mixing box, and the top of the inner wall of the fixed box is fixedly connected with an extrusion device, and the extrusion The bottom of the device is fixedly connected with the moving plate through the connection block, and the top of the moving plate is fixedly connected with the first motor. The output shaft of the first motor is fixedly connected with a first pulley through a coupling, and the surface of the first pulley is connected with a second pulley through a belt drive. A rotating device; a first rotating shaft and a second rotating shaft are fixedly connected to the bottom of the rotating device, a stirring shaft is fixedly connected to the bottom end of the first rotating shaft, and a vibrating rod is fixedly connected to the bottom end of the second rotating shaft; The bottom ends penetrate through the stirring box and extend to the inner wall of the stirring box, and a stirring rod is fixedly connected to the surface of the stirring shaft.

When the mixer is working, the first motor drives the mixing shaft to rotate, the mixing rod can mix the concrete in the mixing box, and the vibrating rod will vibrate to make the concrete vibrate, so as to facilitate the mixing of the concrete.

The above solution has the following defects: the mixer can only mix the concrete in the mixing box through the mixing rod, and the concrete has a certain viscosity after mixing, and the weight of the sand and gravel in the concrete is large and the weight is large, during the mixing process. , the sand and gravel are easily deposited under the mixing bucket, so it is not easy to mix the sand and cement quickly and uniformly just by mixing the concrete.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, one of the objectives of the present invention is to provide a recycled concrete mixer, which can turn the concrete while mixing the concrete, so that the sand and cement can be quickly mixed evenly.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

A recycled concrete mixer includes a mixing drum, a mixing mechanism arranged inside the mixing drum, and a first motor for driving the mixing mechanism to rotate, wherein the mixing mechanism includes a mixing shaft that is vertically arranged and rotatably connected to the mixing drum. The side wall of the mixing drum is provided with a feeding port and a water inlet, and a material turning mechanism is arranged in the mixing drum. Feeding paddles, the drive shaft is vertically arranged, and a plurality of the turning paddles are spirally distributed along the length of the driving shaft; the turning paddles are arranged obliquely, and the turning paddles face downwards from one side of the rotation direction of the driving shaft tilt;

The mixing drum is provided with a driving mechanism for driving the turning mechanism to operate.

By adopting the above technical solution, the drive mechanism can drive the drive shaft to rotate, and when the turning paddle rotates with the drive shaft, when the mixer is stirring the concrete, the turning paddle can turn the concrete and turn the sand and gravel in the lower layer of the concrete to the concrete The upper layer, so that the sand and cement are mixed more uniformly. Therefore, the turning mechanism can improve the uniformity of concrete mixing by the mixer, and can effectively improve the uniformity of concrete mixing by the mixer per unit time, thereby increasing the mixing speed of the mixer and improving the working efficiency of the mixer.

In a preferred example of the present invention, it can be further configured as follows: a plurality of the drive shafts are provided, and the plurality of groups of the drive shafts are evenly distributed along the circumference of the stirring shaft; a support plate is horizontally arranged inside the stirring drum, and the support The plate is rotatably connected with the mixing drum, and the drive shaft passes through the support plate and is rotatably connected with the support plate;

The drive mechanism includes a second motor fixedly connected to the mixing drum, a reducer connected to the output end of the second motor, and a drive assembly connected to the output end of the reducer, and the support plate is fixedly connected to the output end of the reducer; the The drive assembly includes a drive gear fixedly connected with the upper end of the drive shaft and a ring gear meshed with the drive gear; the ring gear is fixedly connected with the mixing drum.

By adopting the above technical solution, the second motor can drive the support plate to rotate, and the support plate can drive the multiple stirring shafts to revolve along the revolution. It can improve the turning rate of the concrete by the feeding mechanism, improve the working efficiency of the mixer, and at the same time can improve the turning strength of the turning mechanism on the concrete, improve the uniformity of the concrete, and ensure the performance of the concrete.

In a preferred example of the present invention, it can be further configured that: the center position of the upper end of the turning paddle in the longitudinal direction is folded down on both sides and arranged in an arc shape.

By adopting the above technical solution, when the turning paddle flips the concrete, the turning paddle can scoop up the concrete and move the concrete upward, so as to realize the turning of the concrete, and the concrete on the turning paddle can turn the two sides of the turning paddle. , the concrete on the turning paddle can be mixed with the concrete on both sides of the turning paddle, so as to improve the uniformity of concrete mixing.

In a preferred example of the present invention, it can be further configured as follows: the side wall of the stirring shaft is connected with a plurality of groups of stirring paddles, and the plurality of groups of the stirring paddles are distributed along the length of the stirring shaft; A plurality of the paddles and a plurality of drive shafts are arranged at intervals to the evenly distributed paddles and the shovel plates fixedly connected with the paddles; the shovel plates are arranged obliquely and are close to the shovel plates of the bottom wall of the mixing drum The lower end is in contact with the bottom wall of the mixing drum, and the side of the scraping plate facing the rotation direction of the mixing shaft is inclined downward.

By adopting the above technical solution, when the first motor drives the stirring shaft to rotate, the stirring paddle can stir the concrete. The shovel plate can scoop up the sand and gravel deposited in the lower layer of the concrete, and turn the sand and gravel to the upper layer of the concrete, so that the cement and the sand and gravel can be mixed more evenly, thereby improving the uniformity of the sand and gravel mixing and the speed of concrete mixing. . , Multiple sets of mixing paddles can turn concrete at different heights to improve the uniformity of concrete mixing. The spacing between the paddle and the drive shaft can avoid the mutual influence between the paddle and the drive shaft and ensure the normal operation of the mixer.

In a preferred example of the present invention, it can be further configured as follows: a plurality of the scraping plates are provided, and the plurality of the scraping plates are distributed along the length direction of the blades; an upper end of the scraping plate is close to the side wall of the mixing drum. The sides are turned up and set in a circular arc.

By adopting the above technical solution, the multiple shovel plates can turn the concrete at different positions, the turning efficiency of the concrete by the turning mechanism can be effectively improved, and the uniformity of the concrete mixing can be improved. Since the coagulation rotates during the stirring process, the rotation of the sand and gravel generates centrifugal force, so the sand and gravel will gradually move to the side close to the side wall of the mixing drum. In response to this problem, the side of the scraper plate close to the mixing drum is folded upward and set in an arc shape. When the scraper plate flips the concrete, under the action of the scraper plate, the concrete will move to the center of the mixing drum. And it is mixed with the concrete located in the center of the mixing drum, which effectively improves the uniformity of concrete mixing.

In a preferred example of the present invention, it can be further configured that: the paddle is arranged in an arc shape, and the bending direction of the paddle is the same as the rotation direction of the stirring shaft.

By adopting the above technical solution, the paddles are arranged in an arc shape. Therefore, when the paddles stir the concrete, the paddles will push the concrete to the position of the side wall of the mixing drum, so that the shovel plate can turn the concrete so that the The concrete at the center of the mixing drum can be continuously mixed with the surrounding concrete, thereby improving the uniformity of concrete mixing and increasing the mixing rate of the concrete by the mixer.

In a preferred example of the present invention, it can be further configured as follows: a turning plate is arranged on the inner side wall of the mixing drum, the turning plate is spirally ascending along the circumferential direction of the mixing drum, and the spiral direction of the turning plate is the same as that of the mixing drum. The stirring shaft rotates in the same direction.

By adopting the above technical solution, when the mixer is mixing the concrete, the turning plate can lift the concrete at the bottom of the mixing drum to the upper part of the mixing drum, thereby improving the uniformity of concrete mixing.

In a preferred example of the present invention, it can be further configured as follows: a mixer is provided outside the feed port, and the mixer includes a rotating shaft whose mixing box is vertically arranged inside the mixing box, and is fixed to the side wall of the rotating shaft. The connected mixing paddle and the third motor for driving the rotating shaft to rotate, a discharge port is provided on the side wall of the mixing box, and the discharge port is communicated with the feed port through a feed pipe, and the feed pipe The two ends are respectively fixedly connected with the mixing drum and the mixing box, and the other end is fixedly connected with the mixing box; the third motor is arranged on the outside of the mixing box and is fixedly connected with the mixing box; the upper end of the mixing box is provided with a plurality of a raw material port.

By adopting the above technical solution, the raw materials of the concrete can be pre-mixed in the mixer, and the third motor drives the rotating shaft to rotate, so as to drive the mixing paddle to mix the raw materials of the concrete, thereby effectively shortening the time. The time for the mixer to mix the concrete, and it can improve the uniformity of the concrete mixing by the mixer.

In a preferred example of the present invention, it can be further configured as follows: the side walls of the mixing box are arranged obliquely, and the mixing box is arranged in the shape of an inverted truncated cone, one end of the mixing paddle away from the rotating shaft and the side of the mixing box wall abuts.

By adopting the above technical solution, when the concrete raw material is placed in the mixing box, since the mixing box is arranged in the shape of an inverted cone, and the mixing paddle can push the concrete raw material out of the mixing box from the discharge port, so that the concrete raw material can pass through the feeding The tube enters the mixing drum, which effectively improves the convenience of the mixer.

In a preferred example of the present invention, it can be further configured as follows: the water inlet is arranged on the upper end of the side wall of the mixing drum, the water inlet is provided with a plurality of water inlets, and the plurality of water inlets are evenly distributed along the circumferential direction of the mixing drum, and the A water inlet pipe is arranged on the outside of the mixing drum, the water inlet pipe is arranged as an annular pipe along the circumferential direction of the mixing drum, and the water inlet pipe is communicated with the water inlet through a plurality of connecting pipes.

By adopting the above technical solution, when adding water to the mixing drum, the water can enter the mixing drum from different positions of the mixing drum through the connecting pipe, so as to facilitate the mixing of concrete raw materials and water, and improve the mixing uniformity of water and concrete, so that the Mix the concrete in a mixer.

To sum up, the present invention includes at least one of the following beneficial technical effects:

1. The turning mechanism can turn the concrete, so that the sand and gravel are not easily deposited at the bottom of the mixing drum, which can effectively improve the uniformity of concrete mixing, and can increase the speed of concrete mixing to a certain extent, and improve the working efficiency of the mixer;

2. Multiple shovel plates can turn the concrete at different positions, which can effectively improve the turning efficiency of the turning mechanism on the concrete, and can improve the uniformity of concrete mixing; the side of the shovel plate close to the mixing drum is turned upwards. It is folded and set in an arc shape. When the shovel plate flips the concrete, under the action of the shovel plate, the concrete will move to the center of the mixing drum and mix with the concrete at the center of the mixing drum, which effectively improves the concrete. Mixing uniformity;

3. The raw materials of concrete can be pre-mixed in the mixer, which can effectively shorten the time for the mixer to mix the concrete, and can improve the uniformity of the concrete mixing by the mixer.

Description of drawings

Fig. 1 is the structural representation of mixer and water inlet pipe;

Figure 2 is a schematic diagram of the internal structure of the mixer.

In the figure, 1, mixing drum; 11, turning plate; 12, supporting plate; 2, stirring mechanism; 21, stirring shaft; 22, stirring paddle; 221, paddle; 222, shovel plate; 3, first motor ;4, turning mechanism; 41, drive shaft; 42, turning paddle; 5, drive mechanism; 51, second motor; 52, reducer; 53, drive assembly; 531, drive gear; 532, ring gear; 6 , mixer; 61, mixing box; 62, shaft; 63, mixing paddle; 64, the third motor; 65, feeding pipe; 7, water inlet pipe; 71, connecting pipe.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , a recycled concrete mixer disclosed in the present invention includes a mixing drum 1 , a mixing mechanism 2 and a material turning mechanism 4 arranged inside the mixing drum 1 . A feeding port and a water inlet are provided on the side wall of the mixing drum 1, and concrete raw materials such as sand, cement and fly ash can be put into the mixing drum 1 through the feeding port; a mixer 6 is provided on one side of the mixing drum 1 , the mixer 6 includes a mixing box 61 and a rotating shaft 62 vertically arranged in the mixing box 61 and a third motor 64 for driving rotation and rotation. The third motor 64 is arranged under the mixing box 61 and is connected with the mixing The box 61 is fixedly connected, the lower end of the rotating shaft 62 is coaxially fixedly connected with the output end of the third motor 64, the side wall of the rotating shaft 62 is fixedly connected with three mixing paddles 63, and the three mixing paddles 63 are evenly distributed along the circumferential direction of the rotating shaft 62; One end of the paddle 63 away from the rotating shaft 62 is in contact with the side wall of the mixing box 61 .

Referring to FIG. 1 , the upper end of the mixing box 61 is provided with a raw material port. After the concrete raw material is poured into the mixing box 61 through the raw material port, the third motor 64 drives the mixing paddle 63 to stir the concrete raw material. The side wall of the mixing box 61 is inclined and the mixing box 61 is in the shape of an inverted truncated cone. The side wall of the mixing box 61 is provided with a discharge port, and a feeding pipe 65 is arranged between the discharge port and the feeding port. , one end of the feeding pipe 65 is fixedly connected with the side wall of the discharge port, and the other end is fixedly connected with the side wall of the feeding port. After the concrete raw material is stirred in the mixing box 61 , the mixing paddle 63 can push the concrete raw material from the mixing box 61 into the mixing drum 1 .

Referring to FIG. 1, there are four water inlets, and the four water inlets are evenly distributed along the circumference of the mixing drum 1. The outer side of the mixing drum 1 is provided with a water inlet pipe 7, and the water inlet pipe 7 is arranged along the circumferential direction of the mixing drum 1. Arrangement, in this embodiment, the water inlet and the feed inlet are located at the same height, and the water inlet pipe 7 is arranged in a three-quarter annular shape. A connecting pipe 71 is arranged between the water inlet pipe 7 and the water inlet. One end of the connecting pipe 71 is communicated with the water inlet pipe 7 and is fixedly connected, and the other end is fixedly connected with the side wall of the water inlet. When water is introduced into the mixing drum 1, the water can be simultaneously introduced into the mixing drum 1 from the four water inlets, so as to facilitate the mixing of the water and the concrete raw materials.

Referring to FIG. 2 , when the water and concrete raw materials enter the interior of the mixing drum 1 , the mixing mechanism 2 and the turning mechanism 4 can mix the concrete. The stirring mechanism 2 includes a first motor 3 arranged below the stirring drum 1 and fixedly connected to the stirring drum 1, a stirring shaft 21 vertically arranged inside the stirring drum 1, and three groups of stirring paddles 22 fixedly connected to the sidewall of the stirring shaft 21. . The stirring shaft 21 is rotatably connected with the lower end of the stirring drum 1 and the lower end of the stirring shaft 21 is coaxially and fixedly connected with the output end of the first motor 3 . The three sets of stirring paddles 22 are distributed along the length of the stirring shaft 21 , and each set of stirring paddles 22 includes three paddles 221 evenly distributed along the circumferential direction of the stirring shaft 21 . The direction is the same as the rotation direction of the stirring shaft 21 . When the first motor 3 drives the stirring shaft 21 to rotate, the paddle 221 can stir the concrete.

Referring to FIG. 2 , the upper end of each paddle 221 is fixedly connected with five scraping plates 222 , and the five scraping plates 222 are distributed along the length direction of the paddle 221 . The scraper plate 222 is inclined, and the scraper plate 222 is inclined downward toward the side of the rotation direction of the stirring shaft 21 . The lower end of the shovel plate 222 located at the bottom of the mixing drum 1 is in contact with the bottom wall of the mixing drum 1. When the paddle 221 mixes the concrete, the shovel plate 222 can scoop up the concrete, thereby turning the concrete. The side of the upper end of the scraper plate 222 close to the side wall of the mixing drum 1 is folded upward and arranged in a circular arc shape. When the scraper plate 222 flips the concrete, the scraper plate 222 can flip the concrete to a position close to the mixing shaft 21 to lift the concrete. Homogeneity of concrete mixing.

Referring to FIG. 2 , two turning plates 11 are also fixedly connected to the inner wall of the mixing drum 1 , and the two turning plates 11 are respectively arranged between the three sets of stirring paddles 22 to prevent the turning plates 11 from interfering with the rotation of the stirring paddles 22 . The turning plate 11 is spirally ascending along the circumferential direction of the mixing drum 1 , and the spiral direction of the turning plate 11 is the same as the rotation direction of the stirring shaft 21 . When mixing the concrete, the turning plate 11 can lift the concrete at the bottom of the mixing drum 1 upwards to mix it with the concrete at the upper part of the mixing drum 1 .

Referring to FIG. 2 , the material turning mechanism 4 includes three drive shafts 41 vertically arranged inside the mixing drum 1 and a turning paddle 42 fixedly connected to the side wall of the driving shaft 41 . The three driving shafts 41 are uniform along the circumference of the mixing shaft 21 . distributed and located between the three paddles 221 respectively. The inner upper end of the mixing drum 1 is horizontally provided with a support plate 12 , and the support plate 12 is rotatably connected to the side wall of the mixing drum 1 .

2 , the mixing drum 1 is provided with a driving mechanism 5 for driving the drive shaft 41 to rotate. The driving mechanism 5 includes a second motor 51 arranged on the upper end of the mixing drum 1 , a reducer 52 connected to the output end of the second motor 51 , and The drive assembly 53 connected to the output end of the reducer 52 . The reducer 52 is fixedly connected with the upper end of the mixing drum 1 , and the second motor 51 is arranged above the reducer 52 and is fixedly connected with the reducer 52 . The output shaft of the reducer 52 extends to the inside of the mixing drum 1 and is fixedly connected with the support plate 12. When the second motor 51 is running, the second motor 51 can drive the support plate 12 to rotate, and the support plate 12 drives the drive shaft 41 along the reducer. 52 The output shaft revolves, and the revolving direction of the drive shaft 41 is the same as the rotation direction of the stirring shaft 21 .

2 , the drive assembly 53 includes a drive gear 531 coaxially and fixedly connected to the upper end of the drive shaft 41 and a ring gear 532 engaged with the drive gear 531 . The three drive gears 531 mesh with the ring gear 532 at the same time. Therefore, when the drive shaft 41 revolves, the drive shaft 41 can auto-rotate, and the auto-rotation direction is opposite to the revolving direction of the drive shaft 41 .

Referring to FIG. 2 , there are four turning paddles 42 on each drive shaft 41 , and the four turning paddles 42 are spirally arranged along the side wall of the drive shaft 41 . The turning paddle 42 is inclined and arranged downwardly along one side of the rotation direction of the drive shaft 41 . Therefore, when the driving shaft 41 rotates, the turning paddle 42 can turn the concrete, and the turning paddle 42 The sand and gravel at the bottom of the mixing drum 1 can be turned upwards.

2, both sides of the center position in the length direction of the upper end of the turning paddle 42 are folded downwards, and are arranged in an arc shape, when the turning paddle 42 flips the concrete, the concrete on the turning paddle 42 can be turned over to both sides of the turning paddle 42, thereby improving the uniformity of concrete mixing.

The implementation principle of this embodiment is as follows: put the concrete raw material into the mixing box 61, start the third motor 64, make the mixer 6 mix the concrete raw material, and make the concrete raw material enter the mixing drum 1 through the feeding port , and at the same time, the water is passed into the mixing drum 1 through the water inlet pipe 7 .

The first motor 3 and the second motor 51 are activated at the same time. The first motor 3 drives the mixing shaft 21 and the mixing paddle 22 to mix the concrete, and the second motor 51 drives the turning mechanism 4 to turn the concrete so that the concrete is evenly mixed.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (10)

1. The utility model provides a recycled concrete mixer, includes churn (1), sets up at inside rabbling mechanism (2) of churn (1) and be used for driving rabbling mechanism (2) pivoted first motor (3), rabbling mechanism (2) including vertical setting and with churn (1) rotate (mixing) shaft (21) of being connected, feed inlet and water inlet, its characterized in that have been seted up on churn (1) lateral wall: the stirring device is characterized in that a stirring mechanism (4) is arranged in the stirring cylinder (1), the stirring mechanism (4) comprises a driving shaft (41) rotatably connected with the stirring cylinder (1) and a plurality of stirring paddles (42) fixedly connected with the driving shaft (41), the driving shaft (41) is vertically arranged, and the stirring paddles (42) are spirally distributed along the length direction of the driving shaft (41); the material turning paddle (42) is obliquely arranged, and the material turning paddle (42) is obliquely downwards inclined towards one side of the rotation direction of the driving shaft (41);

and the stirring cylinder (1) is provided with a driving mechanism (5) for driving the stirring mechanism (4) to operate.

2. A recycled concrete mixer as claimed in claim 1, wherein: the number of the driving shafts (41) is multiple, and multiple groups of driving shafts (41) are uniformly distributed along the circumferential direction of the stirring shaft (21); a support plate (12) is horizontally arranged in the mixing drum (1), the support plate (12) is rotatably connected with the mixing drum (1), and the driving shaft (41) is arranged on the support plate (12) in a penetrating manner and is rotatably connected with the support plate (12);

the driving mechanism (5) comprises a second motor (51) fixedly connected with the stirring cylinder (1), a speed reducer (52) connected with the output end of the second motor (51) and a driving assembly (53) connected with the output end of the speed reducer (52), and the supporting plate (12) is fixedly connected with the output end of the speed reducer (52); the driving assembly (53) comprises a driving gear (531) fixedly connected with the upper end of the driving shaft (41) and a gear ring (532) meshed with the driving gear (531); the gear ring (532) is fixedly connected with the mixing drum (1).

3. A recycled concrete mixer as claimed in claim 1, wherein: the two sides of the center position of the length direction of the upper end of the material turning paddle (42) are downwards turned and arranged in an arc shape.

4. A recycled concrete mixer as claimed in claim 2, wherein: the side wall of the stirring shaft (21) is connected with a plurality of groups of stirring paddles (22), and the plurality of groups of stirring paddles (22) are distributed along the length direction of the stirring shaft (21); the stirring paddle (22) comprises a plurality of blades (221) which are uniformly distributed along the circumferential direction of the stirring shaft (21) and a shoveling plate (222) fixedly connected with the blades (221), and the blades (221) and the driving shafts (41) are arranged at intervals; the shoveling plate (222) is obliquely arranged, the lower end of the shoveling plate (222) close to the bottom wall of the stirring cylinder (1) is abutted against the bottom wall of the stirring cylinder (1), and the shoveling plate (222) inclines downwards towards one side of the rotation direction of the stirring shaft (21).

5. A recycled concrete mixer as claimed in claim 4, wherein: the plurality of shoveling plates (222) are arranged, and the plurality of shoveling plates (222) are distributed along the length direction of the paddle (221); one side of the upper end of the shoveling plate (222), which is close to the side wall of the mixing drum (1), is tilted upwards and is arranged in an arc shape.

6. A recycled concrete mixer as claimed in claim 5, wherein: the paddle (221) is arranged in an arc shape, and the bending direction of the paddle (221) is the same as the rotating direction of the stirring shaft (21).

7. A recycled concrete mixer as claimed in claim 4, wherein: the stirring device is characterized in that a material turning plate (11) is arranged on the inner side wall of the stirring cylinder (1), the material turning plate (11) is arranged in a spiral ascending mode along the circumferential direction of the stirring cylinder (1), and the spiral direction of the material turning plate (11) is the same as the rotation direction of the stirring shaft (21).

8. A recycled concrete mixer as claimed in claim 1, wherein: a mixer (6) is arranged outside the feeding port, the mixer (6) comprises a mixing box (61), a rotating shaft (62) vertically arranged inside the mixing box (61), a mixing paddle (63) fixedly connected with the side wall of the rotating shaft (62) and a third motor (64) for driving the rotating shaft (62) to rotate, a discharging port is formed in the side wall of the mixing box (61), the discharging port is communicated with the feeding port through a feeding pipe (65), two ends of the feeding pipe (65) are respectively and fixedly connected with the mixing drum (1) and the mixing box (61), and the other end of the feeding pipe is fixedly connected with the mixing box (61); the third motor (64) is arranged on the outer side of the mixing box (61) and is fixedly connected with the mixing box (61); and a raw material port is formed in the upper end of the mixing box (61).

9. A recycled concrete mixer as claimed in claim 8, wherein: mixing box (61) lateral wall slope sets up, and mixing box (61) are the setting of back taper platform form, the one end and mixing box (61) lateral wall looks butt of pivot (62) are kept away from in mixing oar (63).

10. A recycled concrete mixer as claimed in claim 1, wherein: the water inlet sets up in churn (1) lateral wall upper end, the water inlet is provided with a plurality ofly, and is a plurality of the water inlet is along churn (1) circumference evenly distributed, the churn (1) outside is provided with inlet tube (7), inlet tube (7) set up to the toroidal tube along churn (1) circumference, inlet tube (7) are linked together with the water inlet through a plurality of connecting pipes (71).

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