Concrete stirring and mixing device with automatic additive adding function

Abstract

The utility model belongs to the technical field of concrete stirring equipment, and discloses a concrete stirring and mixing device with an automatic additive adding function, which comprises a rack and a stirring assembly arranged on the rack, the stirring assembly comprises a material storage barrel arranged on the rack; one end of the driving shaft is rotationally connected with the storage barrel, and the free end of the driving shaft penetrates through the top of the storage barrel; the crushing blade is arranged in the storage barrel, and the crushing blade is coaxially and fixedly connected with the driving shaft; the output end of the driving motor is fixedly connected with the driving shaft; according to the scheme, the driving motor drives the driving shaft and the crushing blades to rotate in the material storage barrel, and the shearing force generated by the blades of the crushing blades is utilized to crush and scatter agglomerated dry powder additives, so that the situation that a part of areas are not coagulated for a long time or the overall strength deviation is too large due to uneven dispersion of the retarders agglomerated with damp is avoided; the utility model solves the problem that the concrete additive is affected with damp and agglomerated.

Description

Technical Field

[0001] This solution belongs to the technical field of concrete mixing equipment, and specifically relates to a concrete mixing device with the function of automatically adding additives. Background Art

[0002] Referring to the background art of the existing publication (announcement) number CN119926246A, a concrete additive is a small amount of chemical or mineral material added during the concrete mixing process. Its main function is to improve the performance of concrete, improve construction efficiency, or make the concrete meet specific engineering requirements. Dry powder concrete additives are a common form of concrete admixtures, usually existing in the form of powdery substances and directly added during the concrete mixing process. The functions and applications of dry powder additives are mainly reflected in improving the workability, strength, durability, etc. of concrete. According to different working conditions and requirements, dry powder additives can be used to adjust the setting time of concrete, enhance its crack resistance, improve frost resistance, etc.

[0003] Referring to the document with the existing publication (announcement) number CN104099989A, a mixing device for producing concrete additives is disclosed, including a frame and a mixing barrel rotatably arranged on the frame. A feeding component and an extrusion component are arranged in the mixing barrel. The feeding component includes a feeding barrel rotatably assembled in the mixing barrel and a driving member connected to the feeding barrel and used to drive the feeding barrel to rotate. A storage cavity is provided in the feeding barrel, and a communication port is provided on the side of the feeding barrel so that when the feeding barrel rotates, the material enters the mixing barrel through the communication port. The extrusion component includes a plurality of arc-shaped plates rotatably assembled on the side of the feeding barrel. When the mixing barrel is in a non-vertical state, the rotation of the feeding barrel will cause the arc-shaped plates to swing under the action of their own gravity, and the arc-shaped plates swing to extrude the material between the feeding barrel and the arc-shaped plates.

[0004] The above-mentioned mixing device swings the arc-shaped plates under the action of their own gravity to extrude the material between the feeding barrel and the arc-shaped plates, facilitating the batch addition of various powders into the mixing barrel and improving the uniformity of powder mixing of the mixing device. However, due to the fact that the temperature difference between day and night in Xinjiang and other regions can reach more than 20°C, the low temperature at night promotes the condensation of water vapor in the air on the surface of the additive to form liquid water, and the high temperature during the day accelerates the evaporation of water, forming a repeated moisture absorption-drying cycle, resulting in the easy moisture absorption and caking of powdered concrete additives located in Xinjiang. Directly adding the additive to the mixing device will cause the caked particles to be unable to disperse evenly. For example, the retarded setting agent that is agglomerated due to moisture will cause uneven dispersion, resulting in non-setting in some areas for a long time or a large deviation in overall strength. Therefore, before mixing the additives, it is necessary to break up the caked additives. Utility Model Content

[0005] The purpose of this solution is to provide a concrete mixing device with the function of automatically adding additives to solve the problem of caking of concrete additives.

[0006] To achieve the above purpose, this solution provides a concrete mixing device with the function of automatically adding additives, including a frame and a mixing component arranged on the frame. The mixing component includes:

[0007] A storage bucket, which is arranged on the frame;

[0008] A drive shaft, one end of which is rotatably connected to the storage bucket, and the free end of the drive shaft passes through the top of the storage bucket;

[0009] Crushing blades, which are arranged in the storage bucket and are coaxially and fixedly connected to the drive shaft;

[0010] A drive motor, the output end of which is fixedly connected to the drive shaft.

[0011] The principle and effect of this solution are as follows: The additives to be added to the concrete are sequentially put into the storage bucket. The drive motor drives the drive shaft and the crushing blades to rotate in the storage bucket, and the shearing force generated by the blades of the crushing blades is used to crush and disperse the caked dry powder additives (such as sodium sulfate early-strength agent and lignosulfonate retarder), so as to avoid the problems of "blooming" or bulging after the caked additives are mixed with water.

[0012] Further, a discharge port is opened at the bottom of the storage bucket; the mixing component further includes a baffle plate and a spring. One end of the spring is fixedly connected to the drive shaft, and the free end is fixedly connected to the baffle plate. The baffle plate is slidably connected to the bottom of the storage bucket, and the baffle plate is provided with a through hole matching the discharge port.

[0013] The principle and effect of this solution are as follows: (1) The through hole and the discharge port in this solution have three states. In the natural state, the through hole and the discharge port are offset, so that the additives put into the storage barrel will not be discharged from the discharge port. In the crushing state, at this time, the crushing blades need to rotate at a relatively high speed (the limit speed) to disperse the materials. Therefore, the spring is subjected to a large centrifugal force, which stretches and drives the baffle plate to move to the limit position, so that the through hole and the discharge port are still offset, and the additives will not be discharged from the storage barrel. In the discharging state, the rotation speed of the crushing blades is reduced by reducing the rotation speed of the motor. The spring is subjected to a small centrifugal force and drives the baffle plate away from the limit position under the action of its own pre-tightening force, so that the through hole and the discharge port are on the same axis. At this time, since the additives have been depolymerized, the materials are discharged to the outside of the storage barrel through the discharge port and the through hole in sequence. (2) This solution only needs to adjust the rotation speed of the driving motor to control the occlusion and opening of the discharge port. The whole process does not require additional complex mechanical structures or manual intervention. Only by relying on the host computer to control the adjustment of the motor rotation speed, the state switching of the discharge port of the storage barrel in different working stages can be realized.

[0014] Furthermore, the stirring assembly further includes a discharge pipe and a stirring barrel. One end of the discharge pipe is fixedly connected to the bottom of the storage barrel, and the free end is arranged in the stirring barrel. The stirring barrel is fixedly arranged on the frame; one end of the driving shaft passes through the storage barrel and the discharge pipe and extends into the stirring barrel, and is coaxially and fixedly connected with a stirring blade.

[0015] The principle and effect of this solution are as follows: (1) After the additives are dispersed, they need to be pre-mixed with water evenly before being put into the concrete slurry. Therefore, the stirring barrel in this solution is used for mixing the additives and water. After the dispersed additives are put into the stirring barrel through the discharge pipe, warm water in equal proportion (for easy dissolution) is added to the stirring barrel, and then the rotation speed of the driving motor is controlled to increase, so that the stirring blade quickly stirs and mixes the materials and water evenly. After forming a solution, it is put into the concrete slurry. In this solution, during the mixing stage of the additives and water, the stirring speed should be avoided being too fast to introduce natural bubbles, so the motor rotation speed should not exceed the limit speed. (2) This solution drives the stirring blade to rotate by sharing the driving shaft, and directly discharges the additives into the stirring barrel, avoiding the transfer of materials.

[0016] Furthermore, the discharge pipe is provided with exhaust holes, the exhaust holes are communicated with the discharge pipe, and the axis of the exhaust holes is parallel to the plane where the top surface of the stirring barrel is located; the windward surface of the blade of the crushing blade is to convert the input air flow into a vertically downward output air flow.

[0017] The principle and effect of this solution are as follows: (1) Generally, there is a lot of dust in the concrete mixing area, and most of it is sand and dust or cement. Generally, the mixing bucket also adopts a design with an opening at the top, which makes it easy for dust to enter the mixing bucket during the process of mixing additives, easily disrupting the ratio of additives to water. More importantly, it is easy to form a sediment of concrete slurry in the mixing bucket, affecting the uniform dissolution and mixing of additives. Although the problem of dust intrusion can theoretically be solved by sealing the top of the mixing drum, in the actual production process, it is necessary to manually observe whether the materials are mixed evenly and add warm water. If it is in a sealed state, it needs to be frequently started and stopped, making the production rather troublesome. (2) This solution solves the problem of dust intrusion during the mixing stage of additives and water by setting exhaust holes on a plane parallel to the top surface of the mixing bucket. As described above, after the additives are put into the mixing bucket, it is necessary to increase the rotation speed of the drive motor (not exceeding the limit speed to ensure that there is a conduction gap between the discharge port and the through hole), so that the mixing blades mix the additives and water. During this stage, due to the relatively high rotation speed of the drive shaft, the crushing blades rotate rapidly, causing the windward surface of the crushing blades to convert the input air flow into a vertically downward output air flow. The air then passes through the gaps of the discharge port and the through hole in sequence. When the air flow passes through the exhaust holes, it jets out from the exhaust holes. Since the drive shaft rotates circumferentially, the ejected air forms an annular "air curtain" on the top surface of the mixing bucket, thus covering the top surface of the mixing drum and preventing dust from entering the mixing bucket. (3) In this solution, the mixing blades can not only break up the caked additives in the storage bucket, but also use the air formed by the blades rotating rapidly to form a vertically downward air flow, and build an "air curtain" on the top surface of the mixing bucket through the exhaust holes, thereby isolating the intrusion of external dust, preventing the additive and water mixture solution from being contaminated, and ensuring the purity and accurate ratio of the additive solution.

[0018] Furthermore, the blades of the crushing blades are in a curved surface shape and are inclined relative to the axis of the drive shaft, so that the air flow formed after being guided by the blades is perpendicular to the horizontal plane.

[0019] The principle and effect of this solution are as follows: When the drive shaft drives the crushing blades to rotate, the curved surface blades can break up the caked additives and cut the air, guiding and converting the input air flow into an air flow perpendicular to the horizontal plane. After the air flow is guided by the blades, a vertically downward air flow is formed and jets out from the exhaust holes.

[0020] Furthermore, the number of blades of the crushing blades is multiple groups, and the multiple groups of blades are all arranged at intervals along the length direction of the drive shaft.

[0021] The principle and effect of this solution are as follows: Through the above settings, the air volume is increased, so that more air is cut by the blades and guided to form a downward air flow.

[0022] Further, it further includes a sealing assembly, and the sealing assembly includes a sealing plug and a tension spring; the sealing plug is used for sealing the exhaust hole, the sealing plug is arranged in the exhaust hole, the sealing plug is fixedly connected with the tension spring, and the free end of the tension spring is fixedly connected with the drive shaft.

[0023] The principle and effect of this solution are as follows: In the foregoing solution, there is a drawback in that an exhaust hole is provided on the side wall of the discharge pipe. Since the exhaust hole is always in communication with the discharge pipe, the additive passing through the discharge pipe is likely to be discharged from the discharge hole. Therefore, this solution solves this problem by providing a sealing assembly. Its principle still uses the change in the motor speed to open and close the exhaust hole. In the state where the storage bucket is discharging materials, since the motor speed is slow and the drive shaft speed is slow, the centrifugal force received by the tension spring is small and will not drive the sealing plug away from the exhaust hole. At this time, the exhaust hole is in a sealed state, and the additive will not be discharged from the exhaust hole during the discharging stage. In the stage of mixing the additive with water, since the motor speed is fast and the drive shaft obtains a fast speed, the tension spring is subjected to a large centrifugal force, stretching the tension spring to drive the sealing plug away from the exhaust hole, so that an exhaust gap is formed between the sealing plug and the exhaust hole, and the wind generated by the crushing blades can be discharged through this gap, thereby sealing the top surface of the mixing bucket.

[0024] Further, the sealing assembly further includes a slider and a compression spring; a discharge port and a groove are provided at the bottom of the discharge pipe, the slider is slidably arranged in the groove, the slider is fixedly connected with the compression spring, the free end of the compression spring is fixedly connected with the drive shaft, and the slider is arranged in cooperation with the discharge port.

[0025] The principle and effect of this solution are as follows: (1) The discharge port provided at the bottom of the discharge pipe allows the additive to be put into the mixing bucket through the discharge port. And since the discharge port is provided, the solution is likely to enter the discharge pipe. Moreover, if the bottom of the discharge pipe is not sealed, part of the wind generated by the crushing blades will be ejected from the bottom, resulting in a small amount of air discharged from the exhaust hole. More importantly, natural bubbles (non-tiny bubbles) are easily introduced into the solution, resulting in too many natural bubbles in the solution after it is subsequently put into the concrete slurry, which will cause the concrete to be honeycombed and not compact enough after setting. (2) In the natural state of the slider in this solution, the discharge port is not blocked. In the state where the discharge pipe is discharging materials, since the drive shaft speed is slow, the centrifugal force received by the slider is small and is not sufficient to drive the slider to move. At this time, the discharge port is still in a conducting state. When the material is discharged into the mixing bucket, since the motor speed increases (the same as the speed required to open the exhaust hole), the slider is subjected to a large centrifugal force at this time, stretching the compression spring, thereby blocking and sealing the discharge port.

[0026] Further, a chute is provided in the groove, and the slider is slidably connected with the chute.

[0027] The principle and effect of this solution are as follows: The chute is used to position and guide the slider to slide in the groove, preventing its movement from being dislocated or misaligned.

[0028] Further, a mixing device for mixing concrete is provided on the frame; the mixing barrel is arranged above the mixing device, a feeding pipe is connected to the bottom of the mixing barrel, the outlet end of the feeding pipe faces the mixing device, and an electric control valve is provided on the feeding pipe.

[0029] The principle and effect of this solution are as follows: The mixing device and the electric control valve are both existing devices, and will not be elaborated here. By connecting the feeding pipe and the electric control valve to the mixing barrel in this solution, the additive mixed with water can be added to the mixing device in a certain amount. Brief Description of the Drawings

[0030] Figure 1 is the front view of the concrete mixing and blending device with the function of automatically adding additives of the present utility model;

[0031] Figure 2 is the internal structure schematic diagram of the mixing component of the present utility model;

[0032] Figure 3 is Figure 2 the partial enlarged view at A in

[0033] Figure 4 is Figure 2 the partial enlarged view at B in

[0034] Figure 5 is Figure 2 the partial enlarged view at C in

[0035] The names of the corresponding reference signs in the drawings are: frame 1, mixing component 2, storage barrel 21, discharge port 211, feeding port 212, drive shaft 22, crushing blade 23, drive motor 24, baffle 25, through hole 251, spring 26, discharge pipe 27, mixing barrel 28, mixing blade 29, discharge pipe 27, exhaust hole 271, discharge outlet 272, groove 273, sealing component 3, sealing plug 31, tension spring 32, slider 33, compression spring 34, mixing device 4. Detailed Description of the Preferred Embodiments

[0036] The concept and the technical effects generated by the present utility model will be clearly and completely described below in conjunction with the embodiments to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model:

[0037] Embodiment:

[0038] Please refer to Figure 1 , the concrete mixing device with the function of automatically adding additives provided in this embodiment includes a frame 1, a mixing component 2 and a mixing equipment 4 installed on the frame 1. Among them, the mixing equipment 4 can refer to the mixing equipment for mixing concrete in the existing publication (announcement) number CN118404701B.

[0039] Please refer to Figure 2 , the mixing component 2 is mainly composed of a storage barrel 21, a driving shaft 22, crushing blades 23 and a driving motor 24. Specifically, the storage barrel 21 is fixedly installed on the upper part of the frame 1 through bolts, and its top is provided with a feeding port 212 for putting additives (such as sodium sulfate early-strength agent, lignosulfonate retarder, etc., which need to be pre-mixed and dissolved with water before being added to the mixing equipment 4). The top end of the driving shaft 22 is rotationally connected to the center of the top of the storage barrel 21 through a bearing, and the bottom end extends downward through the inside of the storage barrel 21. The crushing blades 23 are coaxially fixed to the driving shaft 22 by key connection, and their blades are designed with a curved surface and are arranged in two groups at intervals along the axial direction of the driving shaft 22. It should be noted that the inclination angle of the blades of the crushing blades 23 is α with respect to the axis of the central axis, and the value range of α is 15° ≤ α ≤ 60°. Those skilled in the art can select a specific inclination angle from them. In short, it is to make the air flow form a vertically downward downward air flow after being guided by the blades. The driving motor 24 is rigidly connected to the top end of the driving shaft 22 through a coupling, and can drive the driving shaft 22 to rotate at different speeds. The driving motor 24 adopts a PID servo motor and can be connected to an upper computer to control the speed of the driving motor 24. During operation, the driving motor 24 drives the crushing blades 23 to rotate at a high speed (≥800 rpm), and uses the shear force generated by the blades of the crushing blades 23 to crush the agglomerated additives, avoiding uneven setting of concrete caused by agglomerated materials.

[0040] Furthermore, a discharge port 211 is provided at the bottom of the storage barrel 21, and the mixing component 2 further includes a baffle plate 25 and a spring 26. The baffle plate 25 is slidably matched with the bottom of the storage barrel 21 through a dovetail groove structure, and a through hole 251 matching the aperture of the discharge port 211 is opened on the plate. One end of the spring 26 is welded to the middle of the driving shaft 22, and the other end is fixed to the edge of the baffle plate 25. In the natural state, the through hole 251 is misaligned and closed with the discharge port 211; when the rotation speed of the driving shaft 22 decreases (200 rpm), the pre-tightening force of the spring 26 aligns the through hole 251 with the discharge port 211 to achieve discharging; when the rotation speed increases to the crushing condition (≥800 rpm), the centrifugal force stretches the spring 26 to displace the baffle plate 25, and the through hole 251 is misaligned and closed with the discharge port 211. This structure automatically controls the opening and closing of the discharge port through the change of the rotation speed of the driving motor 24, without the need for an additional actuator. The state change of the above discharge port 211 and the through hole 251 is as Figure 2 shown.

[0041] Please continue reading Figure 2 The stirring assembly 2 also includes a discharge pipe 27 and a stirring barrel 28. The upper end flange of the discharge pipe 27 is connected to the bottom of the storage barrel 21, and the lower end extends to the inside of the stirring barrel 28. The lower end of the drive shaft 22 passes through the central through hole of the discharge pipe 27 and is connected to the stirring blade 29 through a flat key. The stirring barrel 28 is fixed to the frame 1 through a bracket, and an opening is provided on the top. After being crushed, the additive falls into the stirring barrel 28 from the discharge pipe 27, and is mixed with the injected warm water through the stirring blade 29 to form a uniform solution. Under the stirring condition (600rpm), the drive shaft 22 drives the crushing blade 23 and the stirring blade 29 to rotate synchronously, respectively, to realize the integrated crushing-mixing operation. In order to allow the solution stirred and mixed by the mixing barrel 28 to be fed into the mixing device 4, a feeding pipe (not shown) is connected to the bottom of the mixing barrel 28 through a flange, and the outlet of the feeding pipe extends to the top of the feed inlet of the mixing device 4. An electric regulating valve (refer to the dilution water electric valve of CN112999857B) is installed in the middle of the feeding pipe to accurately control the amount of additive solution. During operation, the solution containing the additive is quantitatively injected into the mixing device 4 through the feeding pipe, fully mixed with the concrete raw materials, and finally forms a concrete slurry.

[0042] Please continue reading Figure 2 The side wall of the discharge pipe 27 is provided with an exhaust hole 271, which is connected to the discharge pipe 27, and the axis of the exhaust hole 271 is parallel to the top surface of the mixing barrel 28. When the drive shaft 22 is in the stirring condition (600rpm), there is a conduction gap between the discharge port 211 and the through hole 251 (such as Figure 3 In the fourth state, the airflow generated by the crushing blade 23 is ejected through the exhaust hole 271 to form an annular air curtain, blocking the external dust from invading the mixing barrel 28. During the enterprise experiment, this structure can reduce the dust concentration in the mixing barrel 28 by 82%, ensuring the accurate ratio of the additive solution.

[0043] The device further comprises a sealing assembly 3, which is composed of a sealing plug 31, a tension spring 32, a slider 33 and a compression spring 34. The sealing plug 31 is made of rubber and is used to seal the exhaust hole 271. The sealing plug 31 is connected to the middle of the drive shaft 22 through the tension spring 32. When the drive shaft 22 rotates under non-stirring conditions (600 rpm), the sealing plug 31 closes the exhaust hole 271 under the tension of the tension spring 32; under stirring conditions (600 rpm), the centrifugal force overcomes the elastic force to make the sealing plug 31 separate from the exhaust hole 271 to form an exhaust gap (such as Figure 4 The discharge pipe 27 is provided with a discharge port 272 and a groove 273 at the bottom, the slider 33 slides with the groove 273 through a slide groove (not shown), the compression spring 34 connects the slider 33 and the drive shaft 22, and the slider 33 is arranged in cooperation with the discharge port 272 (as shown in FIG. Figure 5As shown. When the discharging pipe 27 discharges materials at a low speed (200 rpm), the slider 33 keeps the discharging port 272 unblocked; under the stirring condition (600 rpm), the centrifugal force drives the slider 33 to slide and seal the discharging port 272 to prevent the solution from flowing back and the generation of bubbles.

[0044] The above are only the embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A concrete mixing device with an automatic additive adding function, comprising a frame (1) and a mixing assembly (2) arranged on the frame (1), characterized in that: The stirring assembly (2) comprises: A material storage barrel (21), wherein the material storage barrel (21) is arranged on the frame (1); A drive shaft (22), one end of the drive shaft (22) being rotatably connected to the material storage barrel (21), and a free end of the drive shaft (22) passing through the top of the material storage barrel (21); A crushing blade (23), wherein the crushing blade (23) is arranged in the material storage barrel (21), and the crushing blade (23) is coaxially fixedly connected to the driving shaft (22); A drive motor (24), wherein an output end of the drive motor (24) is fixedly connected to the drive shaft (22).

2. The concrete mixing device with automatic additive adding function according to claim 1, characterized in that: The bottom of the material storage barrel (21) is provided with a discharge port (211); the stirring assembly (2) further comprises a baffle plate (25) and a spring (26); one end of the spring is fixedly connected to the drive shaft (22), and the free end is fixedly connected to the baffle plate (25); the baffle plate (25) is slidably connected to the bottom of the material storage barrel (21); and the baffle plate (25) is provided with a through hole (251) that matches the discharge port (211).

3. The concrete mixing device with automatic additive adding function according to claim 2, characterized in that: The stirring assembly (2) further comprises a discharge pipe (27) and a stirring barrel (28); one end of the discharge pipe (27) is fixedly connected to the bottom of the material storage barrel (21), and the free end is arranged in the stirring barrel (28); the stirring barrel (28) is fixedly arranged on the frame (1); one end of the drive shaft (22) passes through the material storage barrel (21) and the discharge pipe (27), extends into the stirring barrel (28), and is coaxially fixedly connected with a stirring blade (29).

4. The concrete mixing device with automatic additive adding function according to claim 3, characterized in that: The discharge pipe (27) is provided with an exhaust hole (271), the exhaust hole (271) is in communication with the discharge pipe (27), and the axis of the exhaust hole (271) is parallel to the plane where the top surface of the mixing barrel (28) is located; the windward surface of the crushing blade (23) converts the input airflow into an airflow output vertically downward.

5. The concrete mixing device with automatic additive adding function according to claim 4, characterized in that: The blades of the crushing blades (23) are in a curved shape and are arranged obliquely relative to the axis of the driving shaft (22), so that an airflow perpendicular to the horizontal plane is formed after being guided by the blades.

6. The concrete mixing device with automatic additive adding function according to claim 5, characterized in that: The crushing blades (23) are provided in multiple groups, and the multiple groups of blades are arranged at intervals along the length direction of the driving shaft (22).

7. The concrete mixing device with automatic additive adding function according to claim 4, characterized in that: The invention also comprises a sealing assembly (3), wherein the sealing assembly (3) comprises a sealing plug (31) and a tension spring (32); the sealing plug (31) is used to seal the exhaust hole (271); the sealing plug (31) is arranged in the exhaust hole (271); the sealing plug (31) is fixedly connected to the tension spring (32); and the free end of the tension spring (32) is fixedly connected to the drive shaft (22).

8. The concrete mixing device with automatic additive adding function according to claim 7, characterized in that: The sealing assembly (3) further comprises a slider (33) and a compression spring (34); a discharge port (272) and a groove (273) are provided at the bottom of the discharge pipe (27); the slider (33) is slidably arranged in the groove (273); the slider (33) is fixedly connected to the compression spring (34); the free end of the compression spring (34) is fixedly connected to the drive shaft (22); and the slider (33) is arranged in cooperation with the discharge port (272).

9. The concrete mixing device with automatic additive adding function according to claim 8, characterized in that: A sliding groove is provided in the groove (273), and the sliding block (33) is slidably connected to the sliding groove.

10. The concrete mixing device with automatic additive adding function according to claim 4, characterized in that: The frame (1) is provided with a mixing device (4) for mixing concrete; the mixing barrel (28) is arranged above the mixing device (4); a feed pipe is connected to the bottom of the mixing barrel (28); an outlet end of the feed pipe faces the mixing device (4); and an electric regulating valve is provided on the feed pipe.

Images