Stirring system of laboratory concrete stirrer

Abstract

The utility model discloses a mixing system of a laboratory concrete mixer, and belongs to the technical field of concrete mixing. Comprising a stirring barrel, a stirring shaft and stirring shovels, the stirring shovels are fixedly connected to the stirring shaft, the stirring shaft is rotationally connected to the rack, the stirring barrel is transversely and rotationally connected to the stirring shaft, and a material opening and a discharging rod are arranged on the stirring barrel; the limiting assemblies are symmetrically arranged on the left side and the right side of the stirring barrel; the scraping plate is installed on a stirring shaft in the stirring barrel, the cleaning assembly is arranged on the barrel wall of the outer side of the stirring barrel, each side of the stirring barrel is provided with at least two sets of limiting assemblies, each limiting assembly comprises a limiting sleeve arranged in a sliding mode, the rack is provided with an inserting groove used for containing the limiting sleeve, the limiting sleeves are inserted into the inserting grooves, and the limiting sleeves are inserted into the inserting grooves. Therefore, the stirring drum is prevented from rotating in the stirring or unloading process, and the stirring system is convenient to fully unload, clean and reliably fix.

Description

Technical Field

[0001] The utility model relates to a stirring system, in particular to a stirring system for a laboratory concrete mixer, belonging to the technical field of concrete mixing. Background Art

[0002] Laboratory concrete mixers usually adopt small-scale compulsory single-horizontal-axis mixers, which are common concrete mixing equipment. Different from the large-scale compulsory single-horizontal-axis concrete mixers used in factories or projects, in the process of researching recycled concrete or concrete additives, it is often necessary to use small-scale compulsory single-horizontal-axis concrete mixers to mix experimental materials.

[0003] The compulsory single-horizontal-axis mixer generally includes a frame, a stirring device, a transmission system and a limiting device. The frame is the supporting part of the whole equipment and is welded by channel steel. The stirring device includes a mixing drum, a stirring shaft and stirring blades. The outer side surface of the mixing drum is provided with a feeding port. The mixing drum is horizontally rotatably connected to the frame. The stirring blades include two groups. The stirring blades are fixedly connected to the stirring shaft. The stirring blades are located inside the mixing drum. The stirring shaft is rotatably connected to the mixing drum. The transmission system includes a reduction motor and a coupling. The coupling is fixedly sleeved on the output shaft of the reduction motor. The stirring shaft is coaxially connected to the coupling. The limiting device includes a limiting rod and a limiting hole opened on the side surface of the mixing drum. The limiting rod is inserted into the limiting hole to prevent the mixing drum from rotating during the stirring and discharging processes. At present, when the compulsory single-horizontal-axis concrete mixer is used for stirring, generally, the discharging port of the mixing drum needs to be upward, the limiting rod is inserted into the limiting hole to lock the position of the mixing drum. At this time, the aggregate is poured into the mixing drum, and the stirring motor is started to make the stirring blades rotate to stir the aggregate. After stirring is completed, the limiting rod is pulled out, the mixing drum is rotated to make the discharging port inclined downward. At this time, the limiting rod is inserted into another limiting hole to lock the position of the mixing drum, and at the same time, the stirred material is discharged through the feeding port.

[0004] Since the mixed concrete has a certain viscosity, when the above mixer discharges materials, some concrete will stick to the inner wall of the mixing barrel and the mixing mechanism and cannot be completely poured out. Long-term accumulation will affect subsequent concrete mixing, thereby reducing the practicability of the device. Incomplete discharging will also cause a certain degree of waste. If water is used for cleaning, it is not convenient to operate. The cleaning process is cumbersome and easy to dirty the clothes of the staff. In addition, the limiting rod usually needs to be used in combination with a connecting rod, a spring and a pedal, etc. to limit and fix the mixing drum. The structure is complex, and this limiting method generally only sets on one side of the mixing barrel, and the force is concentrated on the pin structure. The other side of the mixing barrel is not fixed, affecting the fixing effect. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a mixing system for a laboratory concrete mixer.

[0006] The technical solution adopted by the utility model is as follows: Design a mixing system for a laboratory concrete mixer, which is installed on the frame of the laboratory concrete mixer and connected to the drive motor of the laboratory concrete mixer. It includes a mixing drum, a mixing shaft and mixing blades. The mixing blades are fixedly connected to the mixing shaft. The mixing shaft is rotatably connected to the frame. The mixing drum is horizontally rotatably connected to the mixing shaft. The mixing blades are located inside the mixing drum. A material inlet and a discharge rod are provided on the mixing drum.

[0007] It further includes a scraper, a cleaning component and limiting components symmetrically arranged on the left and right sides of the mixing drum;

[0008] The scraper is installed on the mixing shaft inside the mixing drum and is arranged parallel to the mixing shaft. The outer side of the scraper is attached to the inner wall of the mixing drum. The left and right sides of the scraper are respectively attached to the left and right side walls of the mixing drum;

[0009] The cleaning component is arranged on the outer barrel wall of the mixing drum. The cleaning component includes a plurality of one-way valves arranged in an array along the axial direction of the mixing drum and a connector communicated with all the one-way valves. A sealing cap is threadedly connected to the connector. The one-way valve is communicated with the inner cavity of the mixing drum;

[0010] At least two groups of limiting components are arranged on each side of the mixing drum. The limiting component includes a slidable limiting sleeve. A slot for receiving the limiting sleeve is arranged on the frame. The limiting sleeve is inserted into the slot to prevent the mixing drum from rotating during the mixing or discharging process.

[0011] Further, two groups of mixing blades are arranged on the mixing shaft. Each group is provided with two spiral blades. The two spiral blades in the same group are located on the same side of the mixing shaft and are evenly spaced between the mixing shaft and the side wall of the mixing drum.

[0012] Further, a connecting shaft is respectively arranged at both ends of each group of mixing blades. The mixing blades are fixedly connected to the mixing shaft through the connecting shaft. The spiral central axes of the two spiral blades in the same group coincide with the central axis of the mixing shaft. The spiral directions of the mixing blades between different groups are arranged in the opposite direction.

[0013] Further, the scraper is also connected to the mixing shaft through a connecting shaft. A connecting shaft is respectively arranged at both ends of the scraper. Reinforcing rib strips are respectively arranged on both sides of the scraper to form a cross structure. The side of the scraper close to the side wall of the mixing drum is set as an arc surface.

[0014] Further, the included angle between the connecting shafts at both ends of each group of stirring blades is 135°. The connecting shafts on the adjacent sides of the two groups of stirring blades coincide axially with the stirring shaft, and the included angle between the two connecting shafts on the mutually remote sides is 90°. The scraper is arranged on the stirring shaft between the included angles of the two connecting shafts on the mutually remote sides of the two groups of stirring blades and is located at the center position of the included angle between the two connecting shafts.

[0015] Further, the cleaning assembly further includes an integrated board and an integrated pipe. The integrated board is an arc-shaped board that fits the side wall of the mixing drum. The integrated pipe is arranged outside the integrated board. The one-way valve array is arranged on the integrated board and communicates with the integrated pipe. A joint communicating with the inner cavity thereof is arranged on the integrated pipe.

[0016] Further, through holes corresponding to the one-way valves one by one are opened on the middle barrel wall at the rear side of the mixing drum. The one-way valves of the cleaning assembly extend out of the integrated board and enter the through holes. The integrated board of the cleaning assembly is fixedly connected to the mixing drum and is provided with a seal.

[0017] Furthermore, the limiting assembly further includes a limiting rod fixed to the side of the mixing drum. The limiting sleeve is sleeved outside the limiting rod to achieve sliding. The limiting rod is provided with an external thread at one end located at the mixing drum, and the limiting sleeve is provided with an internal thread at one end close to the mixing drum. The limiting sleeve is fixed to the limiting rod through a threaded structure.

[0018] Furthermore, a limiting block is arranged on the frame. A blind hole is arranged on the limiting block, and the blind hole is a slot for receiving the limiting sleeve.

[0019] Furthermore, the material inlet is a rectangular opening, and its length is not less than the length of the inner cavity of the mixing drum. A cover plate is arranged on the material inlet, and a pull ring is arranged on the cover plate.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] With the setting of the scraper in the present utility model, when the mixer discharges materials, the concrete adhered to the inner wall of the mixing drum can be scraped out to the greatest extent, avoiding the influence on subsequent concrete mixing caused by long-term accumulation, thereby improving the practicability of the device. More complete discharging can also reduce waste. The scraper can also participate in the stirring to improve the stirring effect. With the setting of the cleaning assembly in the present utility model, it is convenient for the cleaning work after the stirring system discharges materials, easy to operate, simplifies the cleaning process, improves the cleaning effect, and further improves the cleaning effect in cooperation with the scraper, stirring blades, etc. With the limiting assemblies symmetrically arranged on the left and right sides of the mixing drum in the present utility model, limiting is set on both sides of the mixing drum to improve the fixing effect, and the limiting device only needs to use the sliding limiting sleeve to cooperate with the slot on the frame, with a simple structure and more convenient use and operation. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 Isometric view of the present invention Figure 1 Schematic diagram.

[0024] Figure 2 For Figure 1 Schematic diagram after hiding the mixing drum, etc.

[0025] Figure 3 Isometric view of the present invention Figure 2 Schematic diagram.

[0026] Figure 4 Schematic diagram of the cleaning component (hiding the sealing cap) of the present invention.

[0027] In the figure: 1, frame; 2, driving motor; 3, mixing drum; 4, mixing shaft; 5, mixing shovel blade; 6, material inlet; 7, discharging rod; 8, scraper; 9, cleaning component; 10, limiting component; 11, one-way valve; 12, joint; 13, sealing cap; 14, limiting sleeve; 15, spiral blade; 16, connecting shaft; 17, reinforcing rib; 18, integrated board; 19, integrated pipe; 20, limiting rod; 21, limiting block; 22, cover plate. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, if the terms "installation", "connection", and "connection" are used, they should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Example 1

[0031] A mixing system for a laboratory concrete mixer is installed on the frame 1 of the laboratory concrete mixer for use, as Figures 1 - 4 shown. This mixing system is connected to the drive motor 2 of the laboratory concrete mixer. It includes a mixing drum 3, a mixing shaft 4, and mixing blades 5. The mixing blades 5 are fixedly connected to the mixing shaft 4. The mixing shaft 4 is rotatably connected to the frame 1 and is connected to the output shaft of the drive motor 2 through a coupling. The mixing drum 3 is horizontally rotatably connected to the mixing shaft 4. The mixing blades 5 are located inside the mixing drum 3. The mixing drum 3 is provided with a feeding port 6 and a discharging rod 7. When discharging, the mixing drum 3 is rotated by the discharging rod 7 so that the feeding port 6 discharges the material obliquely downward; the above are all prior art means and will not be elaborated.

[0032] The mixing system of the laboratory concrete mixer provided in this embodiment further includes a scraper 8, a cleaning assembly 9, and limiting assemblies 10 symmetrically arranged on the left and right sides of the mixing drum 3, which perform limiting and fixing on both sides of the mixing drum, making the fixing more stable and reliable. The scraper 8 is installed on the mixing shaft 4 inside the mixing drum 3 and is arranged parallel to the mixing shaft 4. The outer side of the scraper 8 is in contact with the inner wall of the mixing drum 3. The left and right sides of the scraper 8 are respectively in contact with the left and right side walls of the mixing drum 3. During mixing, the material adhered to the side wall of the mixing drum 3 is scraped off by the scraper 8 to participate in the mixing. The mixing effect of the scraper 8 and the cooperation of the mixing blades 5 make the mixing sufficient. When discharging, the material adhered to the side wall of the mixing drum 3 is scraped off by the scraper 8, ensuring full discharging and saving resources. The cleaning assembly 9 is arranged on the outer side wall of the mixing drum 3. The cleaning assembly 9 includes a plurality of one-way valves 11 arranged in an array along the axial direction of the mixing drum 3 and a joint 12 communicated with all the one-way valves 11. A sealing cap 13 is threadedly connected to the joint 12. The one-way valves 11 are communicated with the inner cavity of the mixing drum 3. After discharging, the sealing cap 13 is removed, a water pipe is connected to the joint 12, the one-way valves 11 discharge water and the mixing shaft 4 is started. The two cooperate to clean the inner cavity of the mixing drum 3. The water outlet end of the cleaning assembly 9 covers along the axial direction of the mixing drum 3, improving the cleaning effect and efficiency. At least two groups of limiting assemblies 10 are arranged on each side of the mixing drum. The limiting assembly 10 includes a slidable limiting sleeve 14. A slot for receiving the limiting sleeve 14 is arranged on the frame 1. During use, the limiting sleeve 14 is slidably inserted into the slot to prevent the mixing drum 3 from rotating during the mixing or discharging process. The structure of the limiting sleeve 14 slidably installed on the mixing drum 3 cooperates with the slot structure of the frame 1, simplifying the traditional limiting and fixing structure of the mixing drum 3, being convenient to use and quickly connect.

[0033] Example 2

[0034] This embodiment further optimizes and refines the structure of the mixing blades 5 on the basis of Example 1, specifically as follows:

[0035] Two groups of stirring blades 5 are arranged on the stirring shaft 4. Each group is provided with two spiral blades 15. The two spiral blades 15 in the same group are located on the same side of the stirring shaft 4 and are evenly spaced between the stirring shaft 4 and the side wall of the stirring cylinder 3. The coverage range of the stirring blades is wider, which improves the stirring rate and also enhances the structural strength of the stirring blades 5.

[0036] In this embodiment, a connecting shaft 16 is respectively arranged at both ends of each group of stirring blades 5. The stirring blades 5 are fixedly welded to the stirring shaft 4 through the connecting shaft 16. The spiral central axes of the two spiral blades 15 in the same group coincide with the central axis of the stirring shaft 4. The spiral directions of the stirring blades 5 between different groups are set in opposite directions (or can also be set in the same direction). During stirring, while the two groups of stirring blades 5 stir the material, the material is formed into a spiral flow, and the stirring is faster and more uniform. It is preferably that both groups of stirring blades 5 make the material in the stirring cylinder 3 flow spirally from the end to the middle, and the stirring effect is better.

[0037] It can be understood that the spiral directions of the two spiral blades 15 in the same group can be set in the same direction or in opposite directions. When set in the same direction, while the two spiral blades 15 in the same group stir the material, the material flows towards one end, and then cooperates with the stirring blades 5 of the other group set in the opposite direction to make the material flow in the opposite direction, improving the stirring effect. When set in the opposite direction, while the two spiral blades 15 in the same group stir the material, the material at different depths flows in the opposite direction, and at the same time cooperates with the stirring blades 5 of the other group set in the opposite direction to make the material flow in the opposite direction, improving the stirring effect.

[0038] Embodiment 3

[0039] This embodiment is a further optimization and refinement of the structure of the scraper 8 on the basis of Embodiment 2, specifically:

[0040] The scraper 8 is also connected to the stirring shaft 4 through the connecting shaft 16. A connecting shaft 16 is respectively arranged at both ends of the scraper 8. Reinforcing rib strips 17 are respectively arranged on both sides of the scraper 8 to form a cross structure, improving its structural strength. The side of the scraper 8 close to the side wall of the stirring cylinder 3 is set as an arc surface, which better fits the inner wall of the stirring cylinder 3 and reduces scraping damage.

[0041] Embodiment 4

[0042] This embodiment is a further optimization and refinement of the structure of the stirring system on the basis of Embodiment 3, specifically:

[0043] In the stirring system described in this embodiment, the included angle between the connecting shafts 16 at both ends of each group of stirring blades 5 is 135°. The connecting shafts 16 on the adjacent sides of the two groups of stirring blades 5 coincide axially with the stirring shaft 4, and the included angle between the two connecting shafts 16 on the mutually remote sides is 90°. The scraper 8 is arranged on the stirring shaft 4 between the included angles of the two connecting shafts 16 on the mutually remote sides of the two groups of stirring blades 5 and is located at the exact center of the included angle between the two connecting shafts 16. The stirring structure is evenly and reasonably distributed, and the stirring effect is better.

[0044] Embodiment 5

[0045] This embodiment further optimizes and refines the structure of the cleaning component 9 on the basis of Embodiment 4. Specifically:

[0046] The cleaning component 9 further includes an integrated board 18 and an integrated pipe 19. The integrated board 18 is an arc-shaped board that fits the side wall of the mixing cylinder 3. The integrated pipe 19 is arranged outside the integrated board 18. The one-way valves 11 are arranged in an array on the integrated board 18 and communicate with the integrated pipe 19. A joint 12 communicating with the inner cavity thereof is arranged on the integrated pipe 19.

[0047] In this embodiment, through holes corresponding to the one-way valves 11 one by one are opened on the middle barrel wall at the rear side of the mixing cylinder 3. The one-way valves 11 of the cleaning component 9 extend out of the integrated board 18 and enter the through holes. The integrated board 18 of the cleaning component 9 is fixedly connected to the mixing cylinder 3 and is provided with a seal, and welding fixation can be adopted. The cleaning component 9 is arranged in the middle at the rear side of the mixing cylinder 3. Cleaning is generally carried out after the mixing cylinder 3 discharges materials and before it returns to the upright position. At this time, the cleaning component 9 is located on the upper side of the entire stirring system, and the material port 6 is located on the lower side, which is convenient for connecting the water pipe, and the water flow of the cleaning component 9 flows out from top to bottom, which is more conducive to cleaning the mixing cylinder 3.

[0048] Embodiment 6

[0049] This embodiment further optimizes and refines the structure of the limiting component 10 on the basis of Embodiment 5. Specifically:

[0050] The limiting component 10 further includes a limiting rod 20 fixed to the side of the mixing cylinder 3. The limiting sleeve 14 is sleeved outside the limiting rod 20 to realize sliding. The limiting rod 20 is provided with an external thread at one end located at the mixing cylinder 3, and the limiting sleeve 14 is provided with an internal thread at one end close to the mixing cylinder 3. The limiting sleeve 14 is fixed to the limiting rod 20 through a threaded structure. When using the limiting sleeve 14 to fix the mixing cylinder 3, unscrew the threaded connection between the limiting sleeve 14 and the limiting rod 20, and then slide the limiting sleeve 14 into the slot on the frame 1 for limiting and fixing the mixing cylinder 3. When not using the limiting sleeve 14 to fix the mixing cylinder 3, slide the limiting sleeve 14 out of the slot on the frame 1 and screw it tightly with the limiting rod 20.

[0051] In this embodiment, a limit block 21 is provided on the frame 1. A blind hole is provided on the limit block 21, and the blind hole is a slot for receiving the limit sleeve 14. The limit assembly 10 only uses the cooperation of the limit rod 20 and the limit sleeve 14, and then the connection between the limit assembly 10 and the frame 1 only requires a limit block 21 with a blind hole to be provided on the frame 1, which greatly simplifies the limit fixing structure of the mixing drum 3 and is also more convenient for operation. It can be understood that, in order to quickly insert the limit sleeve 14 into the slot, the slot diameter can be set to be larger than the outer diameter of the limit sleeve 14, or the slot can be set in a funnel shape. In addition, the slot on the limit block 21 can be set as a through hole, and a thread can be provided in the through hole. Correspondingly, a matching thread can be provided at one end of the limit sleeve 14 close to the limit block 21 for reliable connection.

[0052] It can be understood that the two sets of limit assemblies 10 on each side of the mixing drum 3 can share one limit sleeve 14.

[0053] Embodiment 7

[0054] This embodiment is a further optimization and refinement of the structure of the mixing drum 3 on the basis of Embodiment 6, specifically:

[0055] The material inlet 6 on the mixing drum 3 is a rectangular opening, and its length is not less than the length of the inner cavity of the mixing drum 3, which is convenient for discharging materials. A cover plate 22 is provided on the material inlet 6 to prevent materials from splashing out during stirring. A pull ring is provided on the cover plate 22 to facilitate opening the cover plate 22.

[0056] When using this application, fix the two sides of the mixing drum 3 through the limit assembly 10, add materials for stirring. After stirring is completed, untie the limit fixing structure on the two sides of the mixing drum 3, rotate the mixing drum 3 to the discharging state through the discharging rod 7, and then fix the two sides of the mixing drum 3 through the limit assembly 10. After discharging is completed, unscrew the sealing cap 13, connect a water pipe to the joint 12, start the mixing shaft 4 to cooperate with cleaning the mixing drum 3. After cleaning is completed, replace the sealing cap 13 on the joint 12, untie the limit fixing structure on the two sides of the mixing drum 3, return the mixing drum 3 to the normal position, and then fix the two sides of the mixing drum 3 through the limit assembly 10 to wait for the next stirring use.

[0057] In addition, in the description of the present utility model, unless otherwise specified, the terms "multiple", "multiple roots", "multiple groups" mean two or more, and the terms "several", "several roots", "several groups" mean one or more. In the description of the present utility model, it should be noted that for the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] The specific embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present utility model.

Claims

1. A mixing system for a laboratory concrete mixer, which is installed on the frame of the laboratory concrete mixer and connected to the drive motor of the laboratory concrete mixer. It includes a mixing drum, a mixing shaft and mixing blades. The mixing blades are fixedly connected to the mixing shaft. The mixing shaft is rotatably connected to the frame. The mixing drum is horizontally rotatably connected to the mixing shaft. The mixing blades are located inside the mixing drum. A feeding port and a discharging rod are provided on the mixing drum. It is characterized in that: It further includes a scraper, a cleaning assembly and limiting assemblies symmetrically arranged on the left and right sides of the mixing drum. The scraper is installed on the mixing shaft inside the mixing drum and is arranged parallel to the mixing shaft. The outer side of the scraper is in contact with the inner wall of the mixing drum. The left and right sides of the scraper are respectively in contact with the left and right side walls of the mixing drum. The cleaning assembly is arranged on the outer side wall of the mixing drum. The cleaning assembly includes a plurality of one-way valves arranged in an array along the axial direction of the mixing drum and a joint communicated with all the one-way valves. A sealing cap is threadedly connected to the joint. The one-way valve is communicated with the inner cavity of the mixing drum. At least two groups of limiting assemblies are provided on each side of the mixing drum. The limiting assembly includes a sliding limiting sleeve. A slot for receiving the limiting sleeve is provided on the frame. The limiting sleeve is inserted into the slot to prevent the mixing drum from rotating during the mixing or discharging process.

2. The mixing system of the laboratory concrete mixer according to claim 1, characterized in that: Two groups of mixing blades are provided on the mixing shaft. Each group has two spiral blades. The two spiral blades in the same group are located on the same side of the mixing shaft and are evenly spaced between the mixing shaft and the side wall of the mixing drum.

3. The mixing system of the laboratory concrete mixer according to claim 2, characterized in that: A connecting shaft is respectively provided at both ends of each group of mixing blades. The mixing blades are fixedly connected to the mixing shaft through the connecting shaft. The spiral central axes of the two spiral blades in the same group coincide with the central axis of the mixing shaft. The spiral directions of the mixing blades between different groups are set in opposite directions.

4. The mixing system of the laboratory concrete mixer according to claim 3, wherein: The scraper is also connected to the mixing shaft through a connecting shaft. A connecting shaft is respectively provided at both ends of the scraper. Reinforcing rib strips are respectively provided on both sides of the scraper to form a cross structure. The side of the scraper close to the side wall of the mixing drum is set as an arc surface.

5. The mixing system of the laboratory concrete mixer according to claim 4, characterized in that: The included angle between the connecting shafts at both ends of each group of mixing blades is 135°. The connecting shafts on the adjacent sides of the two groups of mixing blades coincide in the axial direction of the mixing shaft. The included angle between the two connecting shafts on the mutually remote sides is 90°. The scraper is arranged on the mixing shaft between the included angles of the two connecting shafts on the mutually remote sides of the two groups of mixing blades and is located at the center position of the included angle between the two connecting shafts.

6. The mixing system of the laboratory concrete mixer according to any one of claims 1-5, characterized in that: The cleaning assembly further includes an integrated board and an integrated pipe. The integrated board is an arc-shaped board that fits the side wall of the mixing drum. The integrated pipe is arranged outside the integrated board. The one-way valves are arranged in an array on the integrated board and are communicated with the integrated pipe. A joint communicated with the inner cavity of the integrated pipe is provided on the integrated pipe.

7. The mixing system of the laboratory concrete mixer according to claim 6, characterized in that: Through holes corresponding to the one-way valves one by one are opened on the middle side wall at the rear of the mixing drum. The one-way valves of the cleaning assembly extend out of the integrated board and enter the through holes. The integrated board of the cleaning assembly is fixedly connected to the mixing drum and is sealed.

8. The mixing system of the laboratory concrete mixer according to claim 7, characterized in that: The limiting component further includes a limiting rod fixed to the side of the mixing drum. The limiting sleeve is sleeved outside the limiting rod to achieve sliding. The limiting rod is provided with an external thread at one end located at the mixing drum, and the limiting sleeve is provided with an internal thread at one end close to the mixing drum. The limiting sleeve is fixed to the limiting rod through a threaded structure.

9. The mixing system of the laboratory concrete mixer according to claim 8, characterized in that: A limiting block is provided on the frame, and a blind hole is provided on the limiting block. The blind hole is a slot for receiving the limiting sleeve.

10. The mixing system of the laboratory concrete mixer according to claim 9, characterized in that: The material inlet is a rectangular opening, and its length is not less than the length of the inner cavity of the mixing drum. A cover plate is provided on the material inlet, and a pull ring is provided on the cover plate.

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