Concrete mixing plant based on energy-saving motor

Abstract

According to the concrete mixing plant based on the energy-saving motor, the premixing tank is additionally arranged, pre-mixed powder and water are prepared into pre-prepared slurry, and then the pre-prepared slurry is mixed with aggregate in the mixing tank, so that the caking problem caused by direct contact of the powder and the aggregate is effectively avoided, the flowability and mixing uniformity of the powder are improved, and the mixing efficiency is improved. The stirring time is remarkably shortened, a stirring plate with a notch and a cutting steel wire is arranged in the premixing tank, and the prefabricated slurry is further refined and the fluidity and uniformity of the prefabricated slurry are enhanced through the centrifugal cutting effect; the upper collecting pipe and the lower collecting pipe which are arranged in a mirroring manner of the collecting mechanism are used for convectively mixing the aggregate sinking to the bottom and the floating slurry in the middle of the stirring tank, so that the influence of the aggregate sinking to the bottom due to self weight on the mixing uniformity is reduced, the working temperature of the motor can be reduced, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of concrete preparation, and more particularly to a concrete mixing station based on an energy-saving motor. Background Art

[0002] A concrete mixing plant, also known as a concrete precast plant, is a place used for centralized mixing of concrete in construction projects. It produces concrete of uniform quality by mixing cement, aggregates (sand, stone), water and admixtures or additives added as needed in a certain proportion and stirring them with mechanical equipment.

[0003] The main raw materials of concrete include powder, cement, aggregate and water. In the operation process of traditional concrete mixing plants, the mixer is responsible for mixing these raw materials together. However, due to the significant difference in fluidity between the raw materials, especially when the powder and aggregate are in direct contact with each other, they tend to clump or form agglomerates. This mismatch in physical properties poses a challenge to the uniform mixing of concrete, which not only interferes with the uniformity of mixing, but also leads to a longer mixing time, thus affecting the overall production efficiency. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a concrete mixing station based on energy-saving motors, which can achieve uniform and efficient mixing of raw materials.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A concrete mixing station based on an energy-saving motor comprises a mixing tank, wherein the upper end of the mixing tank is fixedly connected to a premixing tank, a first mixing mechanism is arranged in the premixing tank, the first mixing mechanism comprises mixing plates distributed in a circumference, and the mixing plates are connected to a first motor through a mixing shaft; a notch is provided on one side of the mixing plate close to the inner wall of the premixing tank, a plurality of equidistantly distributed cutting steel wires are fixedly connected in the notch, and the cutting steel wires are used to cut lumps formed in the premixed slurry; A second stirring mechanism is provided in the stirring tank, and the second stirring mechanism includes a central tube and a collecting mechanism fixedly connected to the central tube. The collecting mechanism includes an upper collecting tube and a lower collecting tube with the same structure and distributed in an upper and lower mirror image, and a fixed frame fixedly connected to the two. The upper collecting tube includes a horizontal tube and an inclined tube connected to the horizontal tube. The upper end of the central tube is connected to a second motor through a transmission gear set.

[0007] As a further solution of the present invention, the central tube is fixedly connected to a heat exchange tube, the heat exchange tube is connected to an external heat transfer oil temperature control device through a pipeline, and a temperature sensor is fixedly connected to the side wall of the stirring tank.

[0008] As a further solution of the present invention, the outer end of the stirring plate is in sliding contact with the inner wall of the premixing tank, and an arc portion is provided at the outer end thereof, and the notch is provided at the arc portion.

[0009] As a further solution of the present invention, the upper end of the premixing tank is fixedly connected with a powder feeding pipe and a water injection pipe, and the lower end is connected with the stirring tank through a discharge pipe, and a first electric gate valve is fixedly connected to the discharge pipe.

[0010] As a further solution of the present invention, the stirring tank is a hollow cylindrical structure and is provided with a conical cavity at the bottom. The upper part of the stirring tank is fixedly connected to a main feeding pipe, the inner wall of the conical cavity is abutted with a stirring plate fixedly connected to the center pipe, the lower end of the stirring tank is fixedly connected to a discharge pipe, and the discharge pipe is fixedly connected to a second electric gate valve.

[0011] As a further solution of the present invention, the heat exchange tube is a U-shaped tube and its open side faces the central tube.

[0012] As a further solution of the present invention, the central tube is a hollow tube, the lower end of the heat exchange tube is connected to a first inner tube nested in the central tube, the upper end of the heat exchange tube is connected to a second inner tube nested in the central tube, the upper end of the first inner tube is connected to a liquid outlet pipe through a first rotary joint, the second inner tube is connected to a liquid inlet pipe through a second rotary joint, and the liquid inlet pipe and the liquid outlet pipe are connected to an external heat transfer oil temperature control device.

[0013] As a further scheme of the present invention, both the first motor and the second motor are connected to the liquid outlet pipe through a heat exchange component, the heat exchange component includes a heat exchange jacket mounted on the outside of the first motor and the second motor, the heat exchange jacket is connected to the liquid outlet pipe through a first branch pipe and a second branch pipe, a first solenoid valve is installed at the connection point between the first branch pipe and the liquid outlet pipe, a second solenoid valve is provided at the connection point between the second branch pipe and the liquid outlet pipe, and a third solenoid valve is fixedly connected between the first branch pipe, the second branch pipe and the connecting port of the liquid outlet pipe.

[0014] As a further solution of the present invention, a plurality of equally spaced cutting knives are fixedly connected to the inner side of the heat exchange tube. The cutting knives and the heat exchange tube are both made of heat conductive material. The cutting knives are strip-shaped blades with pointed ends at the front and rear ends.

[0015] Compared with the prior art, the advantages of the present invention are: (1) The present invention provides a premixing tank to premix powder and water to obtain a prefabricated slurry, and then put the prefabricated slurry into a mixing tank to mix with aggregate, so that the powder and water are fully mixed and contacted first, thereby overcoming the problem that the powder and aggregate are easily agglomerated when in direct contact, improving the fluidity and mixing uniformity of the powder, saving mixing time, and having better working efficiency.

[0016] (2) The present invention centrifugally cuts the agglomerates formed by the mixture of the feed and water in the premixing tank by means of a notch provided at the outer end of the stirring plate and a cutting wire provided in the notch, thereby further improving the fineness and fluidity of the prefabricated slurry and facilitating the subsequent sufficient mixing of the prefabricated slurry and aggregate.

[0017] (3) The present invention arranges a collecting mechanism in the mixing tank, and utilizes the upper collecting pipe and the lower collecting pipe of the collecting mechanism to allow the aggregates that sink to the bottom and the slurry that floats to the bottom to be mixed by convection in the middle of the mixing tank, thereby further improving the mixing quality and reducing the influence of the aggregates sinking to the bottom due to their own weight on the mixing uniformity.

[0018] (4) The present invention is provided with a rotatable heat exchange tube. During stirring and mixing, the heat exchange tube performing circular motion is in full contact with the reaction raw materials in the mixing tank for heat exchange, thereby improving the effect of controlling the reaction temperature in the mixing tank, reducing the volatilization of water in the raw materials, improving the fluidity of the raw materials, reducing the probability of early setting of concrete, and further reducing the generation of lumps, improving the mixing reaction efficiency, making the heat distribution of the raw materials in various parts of the tank more uniform, and improving the quality of the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the first stirring mechanism in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the stirring plate in the present invention; Figure 5 It is a schematic diagram of the assembly of the collection mechanism and the heat exchange tube in the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the collection mechanism in the present invention; Figure 7 for Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 8 It is a schematic diagram of the horizontal cross-sectional structure of the cutting knife in the present invention.

[0020] Explanation of the numbers in the figure: 1. stirring tank; 2. premixing tank; 3. first stirring mechanism; 4. stirring plate; 401. arc portion; 402. notch; 403. cutting wire; 5. stirring shaft; 6. first motor; 7. second stirring mechanism; 8. center tube; 9. collecting mechanism; 901. upper collecting tube; 9011. horizontal tube; 9012. inclined tube; 902. lower collecting tube; 903. fixed frame; 10. transmission gear set; 11. second motor; 12. stirring blade ; 13. heat exchange tube; 14. first inner tube; 15. second inner tube; 16. first rotary joint; 17. second rotary joint; 18. liquid outlet pipe; 19. liquid inlet pipe; 20. heat exchange jacket; 21. first branch pipe; 22. first solenoid valve; 23. second branch pipe; 24. second solenoid valve; 25. third solenoid valve; 26. cutting knife; 27. first electric gate valve; 28. main feeding pipe; 29. ​​discharge pipe; 30. second electric gate valve; 31. temperature sensor. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1-6In one embodiment of the present invention, a concrete mixing station based on an energy-saving motor includes a mixing tank 1, the upper end of the mixing tank 1 is fixedly connected to a premixing tank 2, the premixing tank 2 is used to mix powder and water to prepare prefabricated slurry; a first mixing mechanism 3 is provided in the premixing tank 2, the first mixing mechanism 3 includes a mixing plate 4 distributed in a circumference, and the mixing plate 4 is connected to a first motor 6 through a mixing shaft 5; a notch 402 is provided on one side of the mixing plate 4 close to the inner wall of the premixing tank 2, and a plurality of equidistantly distributed cutting wires 403 are fixedly connected in the notch 402, and the cutting wires 403 are used to cut lumps formed in the premixed slurry; A second stirring mechanism 7 is provided in the mixing tank 1, and the second stirring mechanism 7 includes a central tube 8 and a collecting mechanism 9 fixedly connected to the central tube 8. The collecting mechanism 9 includes an upper collecting tube 901 and a lower collecting tube 902 with the same structure and mirror-image distribution, and a fixing frame 903 fixedly connected to the two. The upper collecting tube 901 includes a horizontal tube 9011 and an inclined tube 9012 connected thereto. The upper end of the central tube 8 is connected to a second motor 11 through a transmission gear set 10. The second motor 11 drives the central tube 8 to rotate through the transmission gear set 10, and the central tube 8 drives the collecting mechanism 9 to make a circular motion. The lower collecting tube 902 lifts the aggregate located at the lower part of the mixing tank 1, and the upper collecting tube 901 pushes the slurry located at the upper part of the mixing tank 1 downward, so that the aggregate and the slurry are convectively mixed in the middle part of the mixing tank 1.

[0025] Specifically, when producing concrete, the following steps are included: Step 1: Powder and water are injected into the premixing tank 2, and then the first stirring mechanism 3 is started, and the stirring plate 4 centrifugally stirs the raw materials in the premixing tank 2; It should be noted that when the stirring plate 4 rotates in a circle, the condensed mass formed by the mixture of the powder and water moves along the end surface of the stirring plate 4 into the notch 402 at the outer end of the stirring plate 4 under the action of centrifugal force, and is cut by the cutting wire 403 in the notch 402, thereby improving the uniformity of the mixture of the powder and water and increasing the fluidity of the prefabricated slurry; Step 2: when the set stirring time is reached, a prefabricated slurry is obtained, and then the prefabricated slurry is injected into the stirring tank 1; Step three, after the prefabricated slurry in the premixing tank 2 is completely discharged into the mixing tank 1, the aggregate is added into the mixing tank 1, and the second mixing mechanism 7 is started at the same time to perform secondary mixing.

[0026] Compared with the mixer of the traditional mixing station, the present invention is provided with a premixing tank 2 to premix the powder and water to obtain a prefabricated slurry, and then the prefabricated slurry is put into the mixing tank 1 to mix with the aggregate, so that the powder and water are fully mixed and contacted first, which overcomes the problem that the powder and the aggregate are easy to agglomerate when they are in direct contact, improves the fluidity and mixing uniformity of the powder, saves the mixing time, and has better working efficiency; at the same time, through the notch 402 set at the outer end of the mixing plate 4 and the cutting wire 403 set in the notch 402, the agglomerates formed by the mixing of the divided materials and water in the premixing tank 2 are centrifugally cut, further improving the fineness and fluidity of the prefabricated slurry, and facilitating the subsequent full mixing of the prefabricated slurry and the aggregate; in addition, through the collection mechanism 9 set in the mixing tank 1, the upper collection pipe 901 and the lower collection pipe 902 of the collection mechanism 9 are used to make the aggregate that sinks to the bottom and the slurry that floats on the bottom be convectively mixed in the middle of the mixing tank 1, further improving the mixing quality, and reducing the influence of the aggregate sinking to the bottom due to its own weight on the mixing uniformity.

[0027] See also Figure 2-4 The outer end of the stirring plate 4 is in sliding contact with the inner wall of the premixing tank 2 , and an arc portion 401 is provided at the outer end thereof, and a notch 402 is provided at the arc portion 401 .

[0028] Specifically, by providing the arc portion 401, the condensed agglomerates formed by the mixture of powder and water can be more easily collected and injected into the notch 402 to contact the cutting wire 403, thereby improving the crushing efficiency of the condensed agglomerates and further improving the mixing effect.

[0029] See also Figure 2 The upper end of the premixing tank 2 is fixedly connected with a powder feeding pipe and a water injection pipe, and the lower end is connected with the mixing tank 1 through a discharge pipe, and a first electric gate valve 27 is fixedly connected to the discharge pipe.

[0030] Specifically, the communication between the premixing tank 2 and the stirring tank 1 is controlled by the first electric gate valve 27 .

[0031] See also Figure 2 The stirring tank 1 is a hollow cylindrical structure with a conical cavity at the bottom. The upper part of the stirring tank 1 is fixedly connected with a main feeding pipe 28, and the inner wall of the conical cavity is abutted with a stirring piece 12 fixedly connected to the center pipe 8. The lower end of the stirring tank 1 is fixedly connected with a discharge pipe 29, and the discharge pipe 29 is fixedly connected with a second electric gate valve 30.

[0032] Specifically, aggregate is fed into the mixing tank 1 through the main feeding pipe 28 and discharged through the discharge pipe 29. At the same time, the stirring effect is improved by the provided stirring blades 12, and the inner wall of the conical cavity is cleaned to improve the discharge efficiency.

[0033] In another embodiment of the present invention, see Figure 2 , Figure 7 and Figure 8 The central tube 8 is fixedly connected with a heat exchange tube 13 , the heat exchange tube 13 is connected with an external heat transfer oil temperature control device through a pipeline, and a temperature sensor 31 is fixedly connected with the side wall of the stirring tank 1 .

[0034] Specifically, the temperature of the reaction raw materials in the stirring tank 1 is monitored in real time through the temperature sensor 31. When the temperature of the reaction raw materials in the stirring tank 1 needs to be adjusted, the second motor 11 and the external heat transfer oil temperature control device are started. When the central tube 8 drives the heat exchange tube 13 to rotate, the heat exchange tube 13 is driven to rotate in a circle. The heat exchange tube 13 is in full contact with the reaction raw materials in the stirring tank 1 for heat exchange, so that the reaction temperature is regulated.

[0035] Compared with the traditional mixer, the present invention is provided with a rotatable heat exchange tube 13. During stirring and mixing, the heat exchange tube 13 performing circular motion is in full contact with the reaction raw materials in the mixing tank 1 for heat exchange, thereby improving the effect of controlling the reaction temperature in the mixing tank 1, reducing the volatilization of water in the raw materials, improving the fluidity of the raw materials, reducing the probability of premature setting of concrete, and thus reducing the generation of lumps, improving the mixing reaction efficiency, making the heat distribution of the raw materials in various parts of the tank more uniform, and improving the quality of the concrete.

[0036] See also Figure 1 The heat exchange tube 13 is a U-shaped tube and its opening side faces the central tube 8.

[0037] Specifically, the U-shaped heat exchange tube 13 has a larger heat exchange coverage area in the stirring tank 1 and has a certain stirring effect.

[0038] See also Figure 2 and Figure 7 The central tube 8 is a hollow tube. The lower end of the heat exchange tube 13 is connected to a first inner tube 14 nested in the central tube 8. The upper end of the heat exchange tube 13 is connected to a second inner tube 15 nested in the central tube 8. The upper end of the first inner tube 14 is connected to a liquid outlet pipe 18 through a first rotary joint 16. The second inner tube 15 is connected to a liquid inlet pipe 19 through a second rotary joint 17. The liquid inlet pipe 19 and the liquid outlet pipe 18 are connected to an external heat transfer oil temperature control device.

[0039] Specifically, the heat transfer oil is added to the heat exchange tubes 13 when the central tube 8 rotates through the pipeline assembly and the rotary joint.

[0040] See also Figure 7Both the first motor 6 and the second motor 11 are connected to the liquid outlet pipe 18 through a heat exchange component. The heat exchange component includes a heat exchange jacket 20 sleeved on the outside of the first motor 6 and the second motor 11. The heat exchange jacket 20 is connected to the liquid outlet pipe 18 through a first branch pipe 21 and a second branch pipe 23. A first solenoid valve 22 is installed at the connection between the first branch pipe 21 and the liquid outlet pipe 18, and a second solenoid valve 24 is installed at the connection between the second branch pipe 23 and the liquid outlet pipe 18. A third solenoid valve 25 is fixedly connected between the first branch pipe 21 and the second branch pipe 23 and the connection port of the liquid outlet pipe 18.

[0041] Specifically, when the reaction raw materials in the stirring tank 1 need to be cooled, the refrigerated heat-conducting oil is injected into the heat exchange tube 13 through the liquid inlet pipe 19, the second rotary joint 17 and the second inner tube 15 by the external heat-conducting oil temperature control device, and the heat-conducting oil flowing through the heat exchange tube 13 is returned to the external heat-conducting oil temperature control device through the first inner tube 14, the first rotary joint 16 and the liquid outlet pipe 18; at the same time, when the first motor 6 and the second motor 11 need to be cooled, the third solenoid valve 25 is closed and the first solenoid valve 22 and the second solenoid valve 24 are opened to realize the cooling of the first motor 6 and the second motor 11, reduce the working temperature of the motor, and extend the service life of the motor.

[0042] See also Figure 8 A plurality of equally spaced cutting knives 26 are fixedly connected to the inner side of the heat exchange tube 13. The cutting knives 26 and the heat exchange tube 13 are both made of heat-conducting material. The cutting knives 26 are strip-shaped blades with pointed ends at the front and rear ends.

[0043] Specifically, the heat exchange area between the raw material and the heat exchange tube 13 is increased by the cutting blade 26. At the same time, multiple cutting knives 26 distributed at equal intervals rotate and cut the lumps in the raw material, further reducing the condensed lumps, further improving the fluidity of the raw material, accelerating the stirring and mixing process, and reducing the stirring time. It should be noted that the heat conductive material is one of iron and aluminum.

[0044] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concrete mixing station based on energy-saving motors, characterized in that: The invention comprises a stirring tank (1), wherein the upper end of the stirring tank (1) is fixedly connected to a premixing tank (2), wherein a first stirring mechanism (3) is arranged in the premixing tank (2), wherein the first stirring mechanism (3) comprises stirring plates (4) distributed in a circumferential manner, wherein the stirring plates (4) are connected to a first motor (6) via a stirring shaft (5); a notch (402) is formed on one side of the stirring plate (4) close to the inner wall of the premixing tank (2), wherein a plurality of equally spaced cutting wires (403) are fixedly connected in the notch (402), and the cutting wires (403) are used to cut lumps formed in the premixed slurry; The stirring tank (1) is provided with a second stirring mechanism (7), the second stirring mechanism (7) comprising a central tube (8) and a collecting mechanism (9) fixedly connected to the central tube (8), the collecting mechanism (9) comprising an upper collecting tube (901) and a lower collecting tube (902) having the same structure and being arranged in an upper and lower mirror image, and a fixing frame (903) fixedly connected to the upper collecting tube (901), the upper collecting tube (901) comprising a horizontal tube (9011) and an inclined tube (9012) connected thereto, and the upper end of the central tube (8) is connected to a second motor (11) via a transmission gear set (10).

2. A concrete mixing station based on an energy-saving motor according to claim 1, characterized in that: The central tube (8) is fixedly connected to a heat exchange tube (13), the heat exchange tube (13) is connected to an external heat transfer oil temperature control device through a pipeline, and a temperature sensor (31) is fixedly connected to the side wall of the stirring tank (1).

3. A concrete mixing station based on an energy-saving motor according to claim 1, characterized in that: The outer end of the stirring plate (4) is in sliding contact with the inner wall of the premixing tank (2), and an arc-shaped portion (401) is provided at the outer end thereof, and a notch (402) is provided at the arc-shaped portion (401).

4. A concrete mixing station based on an energy-saving motor according to claim 1, characterized in that: The upper end of the premixing tank (2) is fixedly connected to a powder feeding pipe and a water injection pipe, and the lower end is connected to the stirring tank (1) via a discharge pipe, and a first electric gate valve (27) is fixedly connected to the discharge pipe.

5. A concrete mixing station based on an energy-saving motor according to claim 1, characterized in that: The stirring tank (1) is a hollow cylindrical structure and has a conical cavity at the bottom. The upper part of the stirring tank (1) is fixedly connected to a main feeding pipe (28). The inner wall of the conical cavity is abutted with a stirring blade (12) fixedly connected to the central pipe (8). The lower end of the stirring tank (1) is fixedly connected to a discharge pipe (29). The discharge pipe (29) is fixedly connected to a second electric gate valve (30).

6. A concrete mixing station based on an energy-saving motor according to claim 2, characterized in that: The heat exchange tube (13) is a U-shaped tube with its open side facing the central tube (8).

7. A concrete mixing station based on an energy-saving motor according to claim 6, characterized in that: The central tube (8) is a hollow tube; the lower end of the heat exchange tube (13) is connected to a first inner tube (14) nested in the central tube (8); the upper end of the heat exchange tube (13) is connected to a second inner tube (15) nested in the central tube (8); the upper end of the first inner tube (14) is connected to a liquid outlet tube (18) via a first rotary joint (16); the second inner tube (15) is connected to a liquid inlet tube (19) via a second rotary joint (17); and the liquid inlet tube (19) and the liquid outlet tube (18) are connected to an external heat transfer oil temperature control device.

8. A concrete mixing station based on an energy-saving motor according to claim 7, characterized in that: The first motor (6) and the second motor (11) are both connected to the liquid outlet pipe (18) via a heat exchange component. The heat exchange component comprises a heat exchange jacket (20) sleeved on the outside of the first motor (6) and the second motor (11). The heat exchange jacket (20) is connected to the liquid outlet pipe (18) via a first branch pipe (21) and a second branch pipe (23). A first solenoid valve (22) is installed at the connection point between the first branch pipe (21) and the liquid outlet pipe (18). A second solenoid valve (24) is installed at the connection point between the second branch pipe (23) and the liquid outlet pipe (18). A third solenoid valve (25) is fixedly connected between the connection ports of the first branch pipe (21) and the second branch pipe (23) and the liquid outlet pipe (18).

9. A concrete mixing station based on an energy-saving motor according to claim 6, characterized in that: A plurality of equidistantly distributed cutting knives (26) are fixedly connected to the inner side of the heat exchange tube (13); the cutting knives (26) and the heat exchange tube (13) are both made of heat-conducting material; the cutting knives (26) are strip-shaped blades with pointed ends at the front and rear ends.

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