CN216860182U - Concrete mixer - Google Patents

Abstract

The application relates to a concrete mixer, which relates to the field of concrete processing devices and comprises a mixing drum, a spiral mixing paddle, a first motor and a support, wherein the mixing drum is vertically arranged, the top of the mixing drum is open, one side of the bottom of the mixing drum is provided with a first discharge pipe, the first discharge pipe is communicated with the inside of the mixing drum, a valve is arranged on the first discharge pipe, the first motor is fixedly connected with the support, the first motor is arranged above the mixing drum and positioned at the axis of the mixing drum, the spiral mixing paddle is vertically arranged in the mixing drum and comprises a mixing shaft, a spiral belt, an inner blade and an outer blade, the mixing shaft and the spiral belt are both vertically arranged, the top end of the mixing shaft is fixedly connected with an output shaft of the first motor, the top end of the spiral belt is fixedly connected with the bottom end of the mixing shaft, the inner blade is fixedly arranged on the inner side of the spiral belt, and the outer blade is fixedly arranged on the outer side of the spiral belt, the inner blade and the outer blade are both provided with a plurality of blades along the extending direction of the spiral belt. This application has promoted concrete mixer's stirring efficiency.

Description

Concrete mixer

Technical Field

The application relates to the field of concrete processing devices, in particular to a concrete mixer.

Background

Currently, a concrete mixer is commonly used in the concrete processing process, and the concrete mixer is a machine for mixing and stirring cement, gravel aggregate and water into a concrete mixture.

Common concrete mixer includes churn, stirring rake, support and motor, and the churn open-top, and the discharge gate has been seted up to the churn bottom, and the churn is fixed to be set up on the support, and the stirring rake includes pivot and a plurality of blade, and a plurality of blade sets up along pivot circumference, and the stirring rake setting is in the churn, and the output shaft of motor is connected with the one end of stirring rake. When the cement mixer is used, cement, gravel aggregate and water are put into the mixing drum according to a certain proportion from the top of the mixing drum, and the motor drives the stirring paddle to rotate, so that raw materials in the mixing drum are uniformly stirred by the stirring paddle and flow into the collecting container from the discharge hole at the bottom of the mixing drum.

In the related art, the rotating shaft drives the blades to rotate, so that the blades stir the concrete raw materials, and the stirring efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to promote concrete mixer's stirring efficiency, this application provides a concrete mixer.

The application provides a pair of concrete mixer adopts following technical scheme:

a concrete mixer comprises a mixing drum, a spiral mixing paddle, a first motor and a bracket, wherein the mixing drum is vertically arranged, the top of the mixing drum is provided with an opening, and one side of the bottom of the mixing drum is provided with a first discharging pipe which is communicated with the interior of the mixing drum, a valve is arranged on the first discharging pipe, a first motor is fixedly connected with the bracket and is arranged above the mixing drum, and be located the axle center department of churn, the vertical setting of spiral stirring rake is in the churn, the spiral stirring rake includes (mixing) shaft, helical ribbon, interior blade and outer blade, the equal vertical setting in (mixing) shaft and helical ribbon, (mixing) shaft top and first motor output shaft fixed connection, helical ribbon top and (mixing) shaft bottom fixed connection, interior blade is fixed to be set up at the helical ribbon inboard, outer blade is fixed to be set up in the helical ribbon outside, interior blade and outer blade all are provided with a plurality of along the extending direction in helical ribbon.

Through adopting above-mentioned technical scheme, during the use, put into the churn with the concrete raw materials by the opening part at churn top according to a certain proportion in, then first motor rotates and drives the (mixing) shaft and rotate for the spiral stirring rake is at the churn internal rotation, and the concrete raw materials is by the misce bene in the churn, and the concrete mud through mixing is collected by first discharging pipe. Through the setting of helical ribbon, compare in common (mixing) shaft and stirring vane lug connection's mode, concrete raw materials helical ribbon can stir concrete raw materials equally at stirring in-process, has increased the stirring efficiency of stirring rake to concrete raw materials. Through the setting of inner blade and outer blade for the inner blade mixes the stirring to the concrete raw materials of spiral in-band side, and the outer blade mixes the stirring to the concrete raw materials in the spiral in-band side, and the setting of multilayer blade has promoted concrete mixer's stirring efficiency.

Optionally, one side of the outer blade is abutted against the inner wall of the mixing drum, and a gasket made of a flexible material is fixedly arranged on one side of the outer blade which is abutted against the inner wall of the mixing drum.

Through adopting above-mentioned technical scheme, through the setting with outer blade and churn inner wall butt, at spiral stirring rake pivoted in-process, when outer blade stirs concrete slurry, outer blade will be attached to the concrete slurry of churn inner wall and scrape off, has reduced the concrete of piling up on the churn inner wall to realized stirring clear effect simultaneously, promoted and carried out clear efficiency to concrete mixer. The outer blades are made of flexible materials, so that damage to the inner wall of the mixing drum caused by the outer blades in the process of scraping off concrete on the inner wall of the mixing drum is reduced.

Optionally, a vertical rotating shaft is fixedly arranged below the mixing drum, the top end of the rotating shaft is fixedly connected with the mixing drum, the rotating shaft and the mixing drum are coaxially arranged, a second motor is arranged at the bottom end of the rotating shaft, the second motor is fixedly connected with the support, the bottom end of the rotating shaft is fixedly connected with an output shaft of the second motor, and the rotating direction of the output shaft of the second motor is opposite to that of the output shaft of the first motor.

Through adopting above-mentioned technical scheme, during the use, second motor drive churn is along spiral stirring rake pivoted antiport for the slew velocity of spiral stirring rake for the churn has increased, thereby has promoted concrete mixer's stirring efficiency.

Optionally, the outer coaxial cover of agitator is equipped with a protection section of thick bamboo, a protection section of thick bamboo and support fixed connection, a protection section of thick bamboo open-top, and the fixed second discharging pipe that is provided with in one side of protection bobbin base portion, the inside intercommunication of second discharging pipe and protection section of thick bamboo, the center department at protection bobbin base portion is worn to establish by the axis of rotation, and the second motor sets up in protection section of thick bamboo below.

Through adopting above-mentioned technical scheme, in the use, the churn rotates under the drive of second motor, and there is the potential safety hazard when the staff is close to the pivoted churn, through establishing the protection barrel cover outside the churn, has reduced the damage of outside foreign matter to the churn in the rotation to it is isolated with staff and pivoted churn, has promoted concrete mixer's security.

Optionally, slide in the second discharging pipe and wear to be equipped with the third discharging pipe, the one end of third discharging pipe can be established outside first discharging pipe, has seted up the spout on the second discharging pipe, the spout sets up along the length direction of second discharging pipe, it is provided with the slider to slide in the spout, slider and third discharging pipe fixed connection, the spout both sides are all fixed and are provided with the gag lever post, gag lever post and second discharging pipe fixed connection, sliding sleeve is equipped with spacing piece on the gag lever post, spacing piece is used for spacing the slider.

Through adopting above-mentioned technical scheme, when the stirring finishes and needs the ejection of compact, rotate the churn and make first discharging pipe and second discharging pipe just to setting up, and take off spacing piece on by the gag lever post, then slide the slider to the direction that is close to first discharging pipe along the length direction of spout, thereby drive the third discharging pipe and slide to the direction that is close to first discharging pipe, until the third discharging pipe cover is established on first discharging pipe, then establish spacing piece cover on suitable gag lever post, make the third discharging pipe fixed, open the valve again, the even concrete of stirring is discharged by the third discharging pipe, and collect to collecting the container in.

Optionally, the fixed lid in protection section of thick bamboo top is equipped with the protective cover, and the protective cover includes the semi-circular cover plate of two symmetries, and one side fixed connection that two cover plates are close to each other has seted up the material loading mouth on the protective cover, and material loading mouth department is provided with the baffle, and baffle one end is articulated with the protective cover, and the other end and protective cover butt.

Through adopting above-mentioned technical scheme, through the setting of protective cover for concrete mixer is at the in-process of work, and mud can not follow the churn spill, and has reduced the possibility that the foreign matter falls into in the mixer, has reduced the risk that causes the injury at the in-process of mixer work to operating personnel simultaneously.

Optionally, the protection cover is fixedly provided with a photoelectric sensor, the photoelectric sensor is located one side of the baffle close to the first motor together with the hinge shaft of the protective cover, the protection barrel is externally and fixedly provided with a controller, the photoelectric sensor, the first motor and the second motor are all connected with the controller, the controller is used for controlling the opening and closing of the first motor and the second motor, the photoelectric sensor is used for detecting whether the baffle is completely closed, when the baffle is not completely closed, the photoelectric sensor outputs a detection signal, and the controller responds to the detection signal and controls the first motor and the second motor to stop working.

Through adopting above-mentioned technical scheme, when using concrete mixer, under the not full closure's of baffle condition, photoelectric sensor output detection signal, the controller is in response to detection signal to control first motor and second motor stop work, avoided when the staff need overhaul to the churn is inside, the mixer began the possibility of work suddenly, has promoted the security in the concrete mixer use.

Optionally, the rotating shaft penetrates through the bottom of the protection barrel and is rotatably connected with the protection barrel, and a sealing shaft sleeve is fixedly sleeved outside the rotating shaft.

Through adopting above-mentioned technical scheme, through the setting of sealed axle sleeve for the in-process of concrete mixer using, concrete mud can not ooze to the axis of rotation by the gap department of axis of rotation in, has reduced the wearing and tearing to the axis of rotation, and has reduced the possibility of concrete mud seepage to the second motor, has promoted the security performance of concrete mixer in the use.

In summary, the present application includes at least one of the following beneficial technical effects:

compared with a common mode that a stirring shaft is directly connected with a stirring blade, the spiral belt can also stir the concrete raw material in the stirring process through the arrangement of the spiral belt, so that the stirring efficiency of the stirring paddle on the concrete raw material is increased;

the inner blades are used for mixing and stirring concrete raw materials on the inner side of the spiral belt, the outer blades are used for mixing and stirring concrete raw materials on the outer side of the spiral belt, and the stirring efficiency of the concrete mixer is improved due to the arrangement of the multiple layers of blades;

by arranging the protective cover, slurry can not be splashed out of the mixing drum in the working process of the concrete mixer, the possibility that foreign matters fall into the mixer is reduced, and the risk of injury to operators in the working process of the mixer is reduced;

through the setting of photoelectric sensor and controller, under the condition that the baffle is not closed or there is the foreign matter in material loading mouth department, photoelectric sensor output foreign matter detected signal, the controller is responded to the foreign matter detected signal to control first motor and second motor stop work, avoided when the staff need stretch into the churn with the hand and overhauld, the possibility of mixer work of beginning suddenly has promoted the security in the concrete mixer use.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

FIG. 2 is a cross-sectional view of an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a sectional view intended to show the state of a third tapping pipe in the tapping state;

fig. 5 is a partially enlarged view at B in fig. 1.

Description of reference numerals: 1. a stirring mechanism; 11. a mixing drum; 111. a first discharge pipe; 112. a valve; 12. a helical stirring paddle; 121. a stirring shaft; 1211. sealing the shaft sleeve; 122. a helical band; 123. an inner blade; 124. an outer blade; 1241. A gasket; 13. a first motor; 14. a second motor; 141. a rotating shaft; 2. a protection mechanism; 21. a protective cylinder; 211. A second discharge pipe; 2111. a chute; 212. a third discharge pipe; 2121. a slider; 2122. a limiting rod; 213. a limiting sheet; 214. a controller; 22. a protective cover; 221. a feeding port; 222. a baffle plate; 223. a photosensor; 3. and (4) a bracket.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a concrete mixer. Referring to fig. 1, the concrete mixer includes a mixing mechanism 1 and a protection mechanism 2, the mixing mechanism 1 is disposed in the protection mechanism 2, the mixing mechanism 1 is used for mixing and stirring concrete materials, the protection mechanism 2 is used for enclosing the mixing mechanism 1 in a rotation state, the possibility that foreign matters enter the mixing mechanism 1 is reduced, and meanwhile, potential safety hazards caused by the mixing mechanism 1 to an operator are reduced.

Referring to fig. 2 and 3, the stirring mechanism 1 includes a stirring cylinder 11, a spiral stirring paddle 12 and a first motor 13, the stirring cylinder 11 is vertically arranged, the top of the stirring cylinder 11 is open, a first discharging pipe 111 is fixedly arranged on one side of the bottom of the stirring cylinder 11, the first discharging pipe 111 is communicated with the inside of the stirring cylinder 11, a valve 112 is installed on the first discharging pipe 111, the first motor 13 is arranged above the stirring cylinder 11 and located at the axis center of the stirring cylinder 11, the spiral stirring paddle 12 is vertically arranged in the stirring cylinder 11, and the top end of the spiral stirring paddle 12 is fixedly connected with an output shaft of the first motor 13.

During the use, throw into the churn 11 with the concrete raw materials according to a certain proportion by the opening part at churn 11 top in, then the output shaft of first motor 13 drives spiral stirring rake 12 at churn 11 internal rotation to the concrete raw materials is by the misce bene in churn 11, opens valve 112, and the concrete mud through mixing stirring is collected by first discharging pipe 111.

Referring to fig. 2, the helical stirring paddle 12 includes a stirring shaft 121, a helical ribbon 122, a plurality of inner blades 123 and a plurality of outer blades 124, the stirring shaft 121 and the helical ribbon 122 are all vertically disposed, the top end of the stirring shaft 121 is fixedly connected with an output shaft of the first motor 13, the top end of the helical ribbon 122 is fixedly connected with the bottom end of the stirring shaft 121, the plurality of inner blades 123 and the plurality of outer blades 124 are all distributed along the extending direction of the helical ribbon 122, and the inner blades 123 and the outer blades 124 are staggered on the helical ribbon 122, the inner blades 123 are fixedly disposed inside the helical ribbon 122, the outer blades 124 are fixedly disposed outside the helical ribbon 122, the inner blades 123 and the outer blades 124 are all radially disposed along the stirring cylinder 11, one side of the outer blades 124 is abutted to the inner wall of the stirring cylinder 11, and a gasket 1241 made of a flexible material is fixedly disposed on one side of the abutted to the inner wall of the stirring cylinder 11.

During the use, first motor 13 drives (mixing) shaft 121 and rotates, make (mixing) shaft 121 drive helical ribbon 122 at the internal rotation of churn 11, thereby helical ribbon 122 stirs the concrete raw materials in the churn 11, while the interior blade 123 on the helical ribbon 122 mixes the stirring to the inboard concrete raw materials of helical ribbon 122, the exterior blade 124 on the helical ribbon 122 mixes the stirring to the concrete raw materials in the helical ribbon 122 outside, and gasket 1241 scrapes the concrete mud that will adhere to at the 11 inner walls of churn, the concrete of piling up on 11 inner walls of churn has been reduced, thereby realized the clear effect in limit stirring.

Referring to fig. 2, the stirring mechanism 1 further includes a second motor 14, the second motor 14 is disposed below the stirring drum 11, a vertical rotating shaft 141 is fixedly disposed below the stirring drum 11, a sealing sleeve 1211 is fixedly sleeved outside the rotating shaft 141, the top end of the rotating shaft 141 is fixedly connected to the stirring drum 11, the rotating shaft 141 and the stirring drum 11 are coaxially disposed, the bottom end of the rotating shaft 141 is fixedly connected to an output shaft of the second motor 14, and the rotating direction of the output shaft of the second motor 14 is opposite to the rotating direction of the output shaft of the first motor 13.

When the mixer is used, the second motor 14 drives the mixing drum 11 to rotate in the opposite direction of the rotation of the spiral mixing paddle 12, so that the rotation speed of the spiral mixing paddle 12 relative to the mixing drum 11 is increased, the mixing and stirring efficiency of the mixer is improved, the sealing shaft sleeve 1211 outside the rotating shaft 141 prevents concrete slurry from seeping into the rotating shaft 141 from gaps of the rotating shaft 141, the abrasion to the rotating shaft 141 is reduced, and the possibility of concrete slurry seeping into the second motor 14 is reduced.

Referring to fig. 1 and 2, the protection mechanism 2 includes a protection barrel 21 and a protective cover 22, the protection barrel 21 is coaxially sleeved outside the mixing barrel 11, the top opening of the protection barrel 21 is provided with a rotation shaft 141 penetrating the center of the bottom of the protection barrel 21, the rotation shaft 141 is rotatably connected with the protection barrel 21, the second motor 14 is arranged below the protection barrel 21, the protection barrel 21 is externally fixed with a support 3, and the first motor 13 and the second motor 14 are both fixedly connected with the support 3. Protective cover 22 lid is located protection section of thick bamboo 21 top opening part, protective cover 22 comprises the semi-circular cover plate of two symmetries, two cover plates pass through bolt fixed connection, and two cover plates all pass through bolt fixed connection with protection section of thick bamboo 21, (mixing) shaft 121 wears to locate between two cover plates of protective cover 22 and rotates with protective cover 22 to be connected, last material loading 221 has been seted up on protective cover 22, material loading 221 department is provided with baffle 222, baffle 222 one end is articulated with protective cover 22, the other end and protective cover 22 butt.

During the use, open baffle 222, put into the churn 11 with concrete raw materials by material loading mouth 221 in, close baffle 222, concrete mixer begins work, churn 11 and spiral stirring rake 12 rotate to concrete mixer mixes the stirring to concrete raw materials, and protection section of thick bamboo 21 and protective cover 22 are isolated with the outside with pivoted churn 11, promote concrete mixer's security.

Referring to fig. 3, the length of the first discharging pipe 111 is smaller than the distance between the protective barrel 21 and the mixing barrel 11, a second discharging pipe 211 is fixedly arranged on one side of the bottom of the protective barrel 21, the second discharging pipe 211 is communicated with the inside of the protective barrel 21, a third discharging pipe 212 is arranged in the second discharging pipe 211 in a penetrating manner, the third discharging pipe 212 is slidably connected with the second discharging pipe 211, the inner diameter of the third discharging pipe 212 is not smaller than the outer diameter of the first discharging pipe 111, one end of the third discharging pipe 212 close to the mixing barrel 11 can be sleeved on the first discharging pipe 111, a sliding groove 2111 is arranged on the second discharging pipe 211, the sliding groove 2111 is arranged along the length direction of the second discharging pipe 211, a sliding block 2121 is slidably arranged in the sliding groove 2111, the sliding block 2121 is fixedly connected with the third discharging pipe 212, both sides of the sliding groove 2111 are provided with limiting rods 2122, the limiting rods 2122 are fixedly connected with the second discharging pipe 211, and a sliding limiting piece 213 is sleeved on the limiting rods 2122, the stopper piece 213 is used to stop the slider 2121.

Referring to fig. 4, in use, when concrete is required to be discharged after being stirred, the mixing drum 11 is rotated to enable the first discharging pipe 111 and the second discharging pipe 211 to be arranged oppositely, the limiting piece 213 is taken down from the limiting rod 2122, then the sliding block 2121 slides along the length direction of the sliding groove 2111 to the direction close to the first discharging pipe 111, so that the third discharging pipe 212 is driven to slide to the direction close to the first discharging pipe 111 until the third discharging pipe 212 is sleeved on the first discharging pipe 111, then the limiting piece 213 is sleeved on the limiting rod 2122, so that one side of the sliding block 2121, far away from the mixing drum 11, is abutted against the limiting piece 213, the third discharging pipe 212 is fixed, the valve 112 is opened, and the uniformly-stirred concrete is discharged from the third discharging pipe 212 and collected into the collecting container.

Referring to fig. 5, a photoelectric sensor 223 is fixedly arranged on the protective cover 22, a signal transmitting end of the photoelectric sensor 223 is located on one side of the hinge shaft of the baffle 222 and the protective cover 22, which is close to the first motor 13, a signal receiving end of the photoelectric sensor 223 is located on one side of the baffle 222, which is far away from the first motor 13, a controller 214 is fixedly arranged outside the protective cylinder 21, the photoelectric sensor 223, the first motor 13 and the second motor 14 are all connected with the controller 214, the controller 214 is used for controlling the opening and closing of the first motor 13 and the second motor 14, when the signal receiving end of the photoelectric sensor 223 cannot receive an optical signal sent by the signal transmitting end of the photoelectric sensor 223, the photoelectric sensor 223 outputs a detection signal, and the controller 214 responds to the detection signal and controls the first motor 13 and the second motor 14 to stop working.

When the concrete mixer is used, under the condition that the baffle 222 is not completely closed, the optical signal sent by the signal transmitting end of the photoelectric sensor 223 is blocked by the baffle 222, so that the optical signal cannot be received by the signal receiving end of the photoelectric sensor 223, at the moment, the photoelectric sensor 223 outputs a detection signal, the controller 214 responds to the detection signal and controls the first motor 13 and the second motor 14 to stop working, and the possibility that the mixer suddenly starts to work when a worker needs to overhaul the interior of the mixing drum 11 is avoided.

The implementation principle of the concrete mixer in the embodiment of the application is as follows: when the device is used, the baffle 222 is opened, concrete raw materials are put into the mixing drum 11 from the feeding port 221 according to a certain proportion, then the baffle 222 is closed, the first motor 13 drives the spiral mixing paddle 12 to rotate in the mixing drum 11, meanwhile, the second motor 14 drives the mixing drum 11 to rotate along the reverse direction of the rotation of the spiral mixing paddle 12, and the concrete raw materials are uniformly mixed in the mixing drum 11; referring to fig. 4, when concrete is required to be discharged after being stirred, the mixing drum 11 is rotated to enable the first discharging pipe 111 and the second discharging pipe 211 to be arranged oppositely, then the third discharging pipe 212 slides towards the direction close to the first discharging pipe 111 until the third discharging pipe 212 is sleeved on the first discharging pipe 111, and then the limiting piece 213 is sleeved on the limiting rod 2122, so that the third discharging pipe 212 is fixed, the valve 112 is opened, and the uniformly-stirred concrete is discharged from the third discharging pipe 212 and collected into the collecting container.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A concrete mixer is characterized in that: comprises a mixing drum (11), a spiral mixing paddle (12), a first motor (13) and a support (3), wherein the mixing drum (11) is vertically arranged, the top of the mixing drum (11) is open, a first discharge pipe (111) is arranged on one side of the bottom of the mixing drum (11), the first discharge pipe (111) is communicated with the inside of the mixing drum (11), a valve (112) is arranged on the first discharge pipe (111), the first motor (13) is fixedly connected with the support (3), the first motor (13) is arranged above the mixing drum (11) and is positioned at the axle center of the mixing drum (11), the spiral mixing paddle (12) is vertically arranged in the mixing drum (11), the spiral mixing paddle (12) comprises a mixing shaft (121), a spiral belt (122), an inner blade (123) and an outer blade (124), the mixing shaft (121) and the spiral belt (122) are both vertically arranged, and the top end of the mixing shaft (121) is fixedly connected with an output shaft of the first motor (13), the top end of the spiral belt (122) is fixedly connected with the bottom end of the stirring shaft (121), the inner blade (123) is fixedly arranged on the inner side of the spiral belt (122), the outer blade (124) is fixedly arranged on the outer side of the spiral belt (122), and the inner blade (123) and the outer blade (124) are both provided with a plurality of blades along the extending direction of the spiral belt (122).

2. The concrete mixer of claim 1, wherein: one side of the outer blade (124) is abutted against the inner wall of the mixing drum (11), and a gasket (1241) made of a flexible material is fixedly arranged on one side of the outer blade (124) which is abutted against the inner wall of the mixing drum (11).

3. The concrete mixer of claim 1, wherein: a vertical rotating shaft (141) is fixedly arranged below the stirring cylinder (11), the top end of the rotating shaft (141) is fixedly connected with the stirring cylinder (11), the rotating shaft (141) and the stirring cylinder (11) are coaxially arranged, a second motor (14) is arranged at the bottom end of the rotating shaft (141), the second motor (14) is fixedly connected with the support (3), the bottom end of the rotating shaft (141) is fixedly connected with an output shaft of the second motor (14), and the rotating direction of the output shaft of the second motor (14) is opposite to that of the output shaft of the first motor (13).

4. A concrete mixer according to claim 3, wherein: a protective barrel (21) is coaxially sleeved outside the stirring barrel (11), the protective barrel (21) is fixedly connected with the support (3), the top of the protective barrel (21) is open, a second discharging pipe (211) is fixedly arranged on one side of the bottom of the protective barrel (21), the second discharging pipe (211) is communicated with the inside of the protective barrel (21), and a second motor (14) is arranged below the protective barrel (21).

5. A concrete mixer according to claim 4, wherein: sliding and penetrating to be equipped with third discharging pipe (212) in second discharging pipe (211), the one end of third discharging pipe (212) can be established in first discharging pipe (111) outside, spout (2111) has been seted up on second discharging pipe (211), the length direction setting along second discharging pipe (211) is followed in spout (2111), it is provided with slider (2121) to slide in spout (2111), slider (2121) and third discharging pipe (212) fixed connection, spout (2111) both sides are all fixed and are provided with gag lever post (2122), gag lever post (2122) and second discharging pipe (211) fixed connection, sliding sleeve is equipped with spacing piece (213) on gag lever post (2122), gag lever post (213) are used for spacing slider (2121).

6. A concrete mixer according to claim 4, wherein: the fixed lid in protection section of thick bamboo (21) top is equipped with protective cover (22), and protective cover (22) include the semi-circular cover plate of two symmetries, and one side fixed connection that two cover plates are close to each other has seted up material loading mouth (221) on protective cover (22), and material loading mouth (221) department is provided with baffle (222), and baffle (222) one end is articulated with protective cover (22), and the other end and protective cover (22) butt.

7. The concrete mixer of claim 6, wherein: fixed photoelectric sensor (223) that is provided with on protective cover (22), photoelectric sensor (223) are located baffle (222) and protective cover (22) articulated shaft and are close to one side of first motor (13), protective barrel (21) external fixation is provided with controller (214), photoelectric sensor (223), first motor (13), second motor (14) all are connected with controller (214), controller (214) are used for controlling opening and close of first motor (13) and second motor (14), photoelectric sensor (223) are used for detecting whether baffle (222) are closed completely, when baffle (222) are not closed completely, photoelectric sensor (223) output detection signal, controller (214) respond to detection signal, and control first motor (13) and second motor (14) stop work.

8. A concrete mixer according to claim 4, wherein: the rotating shaft (141) penetrates through the bottom of the protection barrel (21) and is rotatably connected with the protection barrel (21), and a sealing shaft sleeve (1211) is fixedly sleeved outside the rotating shaft (141).

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