A mixing device for cement mortar production

Abstract

The application relates to the technical field of cement mortar production, and discloses a mixing device for cement mortar production, which comprises a mixing barrel and a mixing mechanism. The mixing mechanism comprises a rotating shaft vertically arranged in the mixing barrel. The lower end surface of the mixing barrel is fixed with a discharging barrel with a non-circular cross section. The upper end of the discharging barrel is closed, and the side wall of the discharging barrel is provided with a discharging port in the mixing barrel. An opening and closing piece capable of opening the discharging port after rising and closing the discharging port after falling is vertically and elastically sealed and arranged in the discharging barrel. The lower end surface of the opening and closing piece is flush with the lower end of the discharging port after falling. The lifting and static state of the opening and closing piece are controlled by the rotation or static state of a screw rod which is coaxially and rotationally matched with the rotating shaft. A threaded groove matched with the screw rod is fixedly arranged on the opening and closing piece. The relative rotation or static state of the screw rod and the rotating shaft is controlled by an automatic locking mechanism. The mixing device has a high discharging rate, can automatically scrape off the materials on the inner wall of the discharging barrel without another driving mechanism, and avoids dust raising.

Description

Technical Field

[0001] This invention relates to the field of cement mortar production technology, specifically to a mixing device for cement mortar production. Background Technology

[0002] Cement mortar is a mortar made of cement, fine aggregate and water as needed. It can be used directly for the construction or paving of buildings or roads. Cement mortar is a semi-solid mixture. After being exposed to air for a period of time, it will dry and form hard lumps, which makes it difficult to transport and store.

[0003] Dry-mixed mortar, generally referring to dry powder mortar, is a granular or powdery substance made by physically mixing aggregates (such as quartz sand), inorganic cementitious materials (such as cement), and additives (such as polymers) in a certain proportion after drying and screening. It is transported to the construction site in bagged or bulk form and can be used directly after being mixed with water.

[0004] Chinese Patent Publication No. CN109834834A discloses a cement mortar mixing device, including a mixing tank, a motor, a mixer, and an automatic controller. A motor base is provided above the mixing tank, and the motor is mounted on the motor base. A coupling is provided below the motor. A retarder tank is provided on one side above the mixing tank, and a solenoid valve is installed below the retarder tank. A cement input pipe is provided on one side above the mixing tank, and a cleaning water pipe is provided on one side inside the mixing tank. A rotating shaft is provided inside the mixing tank, and the mixer is mounted on the lower end of the rotating shaft. An insulation shell is provided on the outside of the mixing tank, and the automatic controller is mounted on one side of the insulation shell. A water inlet pipe is provided on one side of the insulation shell, and a mortar output pipe is provided below the mixing tank.

[0005] Dry-mixed mortar powder will adhere to the inner wall of the output pipe. Once the powdered dry-mixed mortar on the output pipe falls off during idle periods or packaging gaps, it will cause dust pollution. Summary of the Invention

[0006] In view of the dust problem caused by the discharge of existing mixing equipment, the purpose of this invention is to provide a mixing equipment that can automatically remove powdery dry mortar from the output pipe.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a mixing device for cement mortar production, comprising a mixing tank and a mixing mechanism, the mixing mechanism comprising a rotating shaft vertically rotatably disposed inside the mixing tank, a stirring rod located on the rotating shaft, and a motor located at the upper end of the mixing tank for driving the rotating shaft to rotate. A discharge tank with a non-circular cross-section is fixed to the lower end face of the mixing tank. The discharge tank opening faces downward and extends outside the mixing tank. The upper end of the discharge tank is closed, and a discharge port is provided on the side wall of the discharge tank inside the mixing tank. A vertically elastically sealed lifting and lowering opening and closing component is provided inside the discharge tank, which can open the discharge port after rising and close the discharge port after falling. After falling, the lower end face of the opening and closing component is flush with the lower end of the discharge port. The lifting and stopping of the opening and closing component is controlled by the rotation or stopping of a screw that rotates concentrically with the rotating shaft. A threaded groove that cooperates with the screw is fixedly provided on the opening and closing component. The relative rotation or stopping of the screw and the rotating shaft is controlled by an automatic locking mechanism.

[0008] According to the above solution: An opening and closing component is added, which works in conjunction with the vertical elastic seal of the discharge hopper. The lifting and lowering movement of the component allows for the opening and closing of the discharge port. When the component descends, it automatically scrapes off material adhering to the inner wall of the discharge hopper, preventing material from falling and causing dust during subsequent non-discharge processes. The lifting and lowering of the component does not require a drive mechanism; an automatic locking mechanism connects or disconnects the screw and the rotating shaft, thus achieving the lifting or stopping of the component. Compared to a drive mechanism, using only an automatic locking mechanism significantly reduces installation difficulty and cost. Therefore, this solution, using the opening and closing component and the automatic locking mechanism, can replace the traditional shut-off valve to open and close the material port and automatically scrape material from the inner wall of the discharge hopper. Furthermore, the forward and reverse rotation and the stopping of the screw can be achieved simply by using the rotation of the rotating shaft and the combined action of the automatic locking mechanism. The structure is ingenious, multifunctional, and reasonably priced.

[0009] Furthermore, the automatic locking mechanism includes a receiving groove recessed at the upper end of the lead screw, an electromagnet fixed at the bottom of the receiving groove, and a limiting groove recessed at the bottom of the rotating shaft opposite to the receiving groove. A limiting block is telescopically installed in the receiving groove, which can be fully retracted into the receiving groove or partially extended out of the receiving groove to cooperate with the limiting groove. The extension and retraction of the limiting block is controlled by the energization or de-energization of the electromagnet. A spring with both ends fixed to the limiting block and the electromagnet is provided between the limiting block and the electromagnet.

[0010] According to the above scheme: the extension and retraction of the limit block is achieved by energizing or de-energizing the electromagnet, thereby realizing the arbitrary switching between the fixed connection and the rotational connection of the lead screw and the rotating shaft. When the electromagnet is de-energized, the limit block is in the pop-out state. The limit block and the lower end face of the rotating shaft first elastically abut against each other until the rotating shaft rotates to the limit groove and the limit block are directly aligned. Then, the limit block is inserted into the limit groove under the action of the spring, so that the lead screw directly switches from the stationary state to the state of rotating synchronously with the rotating shaft.

[0011] Furthermore, the lower end of the rotating shaft extends into the discharge hopper and is sealed and rotates with the discharge hopper, while the lead screw is located directly below the rotating shaft and rotates with the rotating shaft.

[0012] According to the above solution: there is a clearance between the rotating shaft and the lead screw so that the rotating shaft can rotate smoothly when the lead screw is stationary. However, if these clearances are located outside the discharge hopper, material will enter, thus affecting the smoothness of the rotating shaft's rotation.

[0013] Furthermore, a self-cleaning mechanism is provided at the lower end of the opening and closing component to automatically clean the lead screw as it rotates. The self-cleaning mechanism includes a cleaning brush that is elastically interference-fitted with a partial side wall of the lead screw at the lower end of the opening and closing component, a rotating rod that is sealed and rotates with the opening and closing component at the upper end of the cleaning brush, and a linkage mechanism that drives the rotating rod to extend and rotate as it rotates with the lead screw between the rotating rod and the lead screw.

[0014] According to the above solution: when the material enters the discharge bucket from the mixing bucket through the discharge port, it is in a tilted state and will inevitably be contaminated on the lead screw. This will cause the lead screw to jam with the thread groove, and the material in the lead screw thread will also increase the probability of dust. By adding a self-cleaning mechanism, there is no need to set up a separate drive mechanism. The rotation of the lead screw is used to drive the cleaning brush to remove the material in the lead screw thread through the linkage structure.

[0015] Furthermore, the rotating rod includes a follower rotating rod that rotates in conjunction with the opening and closing element and rises and falls synchronously with the opening and closing element, and a cooperating rotating rod located at the upper end of the follower rotating rod and cooperating with the lead screw. The lower end of the cooperating rotating rod extends into a telescopic rod that rotates synchronously with the opening and closing element and extends and retracts relative to the follower rotating rod.

[0016] According to the above scheme: the rotating rod includes a follower rotating rod, a telescopic rod, and a cooperating rotating rod. The telescopic rod extends and retracts relative to the follower rotating rod, which drives the follower rotating rod and the cooperating rotating rod to rotate synchronously and extend and retract relative to each other.

[0017] Furthermore, the linkage mechanism includes a driven gear concentrically fixed on the mating rotating rod and a drive gear concentrically fixed on the upper end of the lead screw and meshing with the driven gear, and a retaining part is provided on the lead screw to ensure that the mating rotating rod rotates horizontally.

[0018] According to the above solution: by engaging the driven gear on the rotating rod with the driving gear on the lead screw, and keeping the height constant by the retaining part, the rotating rod can rotate with the lead screw, thus eliminating the need for a drive mechanism to drive the cleaning brush to automatically remove material from the lead screw.

[0019] Furthermore, the retaining part includes a limiting plate disposed below the drive gear, which is concentric with the lead screw and fits against the upper and lower end faces of the driven gear.

[0020] According to the above scheme: since the rotating rod can only rotate and move vertically up and down, it is only necessary to set a limit plate to limit its vertical up and down movement, thereby driving the rotating rod to only rotate.

[0021] Furthermore, a dust cover is fitted outside the mixing hopper and outside the discharge hopper, and an air extraction pipe is installed on the dust cover, which is connected to the suction pipe of a vacuum cleaner.

[0022] According to the above solution: after the dust cover is lowered, it can be placed against the opening of the packaging bag to prevent the material from being thrown out of the opening of the packaging bag. Furthermore, by setting up an exhaust pipe connected to a vacuum cleaner, it can further prevent material powder from falling onto the ground outside the packaging bag.

[0023] Furthermore, a crushing mechanism is provided on the stirring rod, which includes several cutting blades with different inclination angles fixed on the stirring rod, and the cutting blades have their cutting surfaces along the rotation axis as their cutting edges.

[0024] According to the above scheme: the material is cut at different angles by the cutting blade, and the material is stirred by the stirring rod, which can continuously refine the material and avoid material lumps.

[0025] Furthermore, a scraper bar extends vertically within the mixing barrel and elastically abuts against the inner wall of the mixing barrel. The end of the scraper bar near the rotating shaft is fixedly connected to the end of the mixing rod away from the rotating shaft.

[0026] According to the above scheme: the scraper bar can scrape off the material on the inner wall of the mixing barrel, avoid the material from accumulating on the inner wall of the mixing barrel, and improve the discharge rate.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0028] An additional opening and closing component is added, which works in conjunction with the vertical elastic seal of the discharge hopper. The lifting and lowering movement of the component opens and closes the discharge port. When the component descends, it automatically scrapes off the material adhering to the inner wall of the discharge hopper, preventing material from falling and causing dust during subsequent non-discharge processes. The lifting and lowering of the component does not require a drive mechanism; an automatic locking mechanism connects or disconnects the screw and the rotating shaft, thus achieving the lifting, lowering, or stationary movement of the component. Compared to setting a drive mechanism, only an automatic locking mechanism is needed, which significantly reduces the difficulty and cost of installation. Therefore, this solution, using the opening and closing component and the automatic locking mechanism, can replace the traditional shut-off valve to open and close the material port and automatically scrape the material from the inner wall of the discharge hopper. Moreover, the forward and reverse rotation and stationary movement of the screw can be achieved simply by using the rotation of the rotating shaft and the combined action of the automatic locking mechanism. The structure is ingenious, multifunctional, and reasonably priced.

[0029] A self-cleaning mechanism is added. By utilizing the rotation of the lead screw and a linkage structure, the driven gear on the mating rotating rod meshes with the driving gear on the lead screw, and the holding part keeps the height constant. This allows the mating rotating rod to rotate with the lead screw, thus eliminating the need for a drive mechanism to drive the cleaning brush to automatically remove material from the lead screw and maintain the smooth lifting and lowering of the opening and closing parts. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a front view of a mixing device for cement mortar production according to this embodiment;

[0032] Figure 2 yes Figure 1 A sectional view of AA;

[0033] Figure 3 yes Figure 2 A cross-sectional view of BB;

[0034] Figure 4 yes Figure 3 A magnified view of A;

[0035] Figure 5 This is an isometric view of the mixing mechanism, opening and closing component, and self-cleaning mechanism in this embodiment when they are in operation.

[0036] Figure 6 yes Figure 5 A magnified view of B.

[0037] In the diagram: 1. Mixing bucket; 2. Discharge bucket; 3. Dust cover; 4. Motor; 5. Rotating shaft; 6. Stirring rod; 7. Cutting blade; 701. Blade; 8. Scraper rod; 801. Elastic scraper; 9. Lead screw; 10. Discharge port; 11. Pull rope; 12. Limiting groove; 13. Limiting block; 14. Receiving groove; 15. Electromagnet; 16. Spring; 17. Drive gear; 18. Driven gear; 19. Limiting plate; 20. Rotating rod; 201. Matching rotating rod; 202. Follower rotating rod; 203. Guide rod; 204. Limiting section; 21. Cleaning brush; 22. Opening and closing component. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Example

[0039] A mixing device for cement mortar production, as described above. Figures 1-3 as well as Figure 5As shown, the system includes a mixing tank 1 and a mixing mechanism. The mixing mechanism includes a rotating shaft 5 vertically rotatably disposed inside the mixing tank 1, a stirring rod 6 located on the rotating shaft 5, and a motor 4 located at the upper end of the mixing tank 1 for driving the rotating shaft 5 to rotate. The stirring rod 6 extends horizontally from the rotating shaft 5 towards the inner wall of the mixing tank 1. At least two stirring rods 6 are spaced apart axially around the rotating shaft 5. A crushing mechanism is disposed on the stirring rod 6. The crushing mechanism includes several cutting blades 7 with different inclination angles fixed on the stirring rod 6. The cutting blade 7 has its cutting edge 701 along the rotating surface of the rotating shaft 5. There are material passages between the cutting blades 7 and between the cutting blades 7 and the stirring rods 6 for material to pass through. As the rotating shaft 5 rotates, the cutting blade 7 always cuts the material along its rotating surface, which can cyclically cut the lumpy material at different cutting angles. With the cooperation of the stirring rod 6, the material is cut and stirred at the same time, thus continuously refining the material. Inside the mixing tank 1, a scraper 8 extends vertically along the inner wall of the mixing tank 1 and is elastically engaged with it. The end of the scraper 8 near the mixing tank 1 is an elastic scraper 801. The end of the scraper 8 near the rotating shaft 5 is fixedly connected to the end of the stirring rod 6 away from the rotating shaft 5. As the rotating shaft 5 rotates, the elastic scraper 801 is always in the motion of scraping the inner wall of the mixing tank 1, preventing the material from sticking to the inner wall of the mixing tank 1.

[0040] A discharge bucket 2 with a non-circular cross-section is fixed to the lower end face of the mixing bucket 1. The discharge bucket 2 has its opening facing downwards and extends beyond the outside of the mixing bucket 1. The upper end of the discharge bucket 2 is closed, and a discharge port 10 is provided on the side wall of the discharge bucket 2 inside the mixing bucket 1. Multiple discharge ports 10 are spaced apart along the circumference of the discharge bucket 2. A vertically elastically sealed opening and closing element 22 is provided inside the discharge bucket 2, which can open the discharge port 10 when it rises and close the discharge port 10 when it falls. (Refer to...) Figures 2-4 As shown, the opening and closing element 22 has an elastic layer fixed to its outside, which can achieve a sealing fit between the opening and closing element and the discharge bucket, and also avoid wear caused by the relative movement of the two. After the opening and closing element 22 is lowered, the lower end face is flush with the lower end of the discharge port 10. Therefore, the opening and closing element 22 is similar to a new type of shut-off valve. However, it not only plays the role of opening and closing the discharge port 10, but also automatically scrapes off the material on the inner wall of the discharge bucket 2 below the opening and closing element 22 while closing the discharge port 10 as the opening and closing element 22 is lowered. At this time, the material can be discharged into the packaging bag, which avoids dust and reduces material waste.

[0041] The lifting and stopping of the opening / closing element 22 are controlled by the rotation or stopping of a lead screw 9 that rotates concentrically with the rotating shaft 5, as shown in the reference. Figure 4As shown, the opening and closing part 22 is fixedly provided with a threaded groove that cooperates with the lead screw 9. When the lead screw 9 rotates, the opening and closing part 22 can only move up and down because it is not circular. When the lead screw 9 is stationary, the opening and closing part 22 is also stationary. In this embodiment, the cross-section of the inner wall of the discharge bucket 2 is rectangular, the cross-section of the opening and closing part 22 is rectangular, and the opening and closing part 22 has a threaded groove vertically arranged in the center. The lead screw 9 cooperates with the threaded groove.

[0042] To reduce setup costs and the number of drive mechanisms, the lower end of the rotating shaft 5 extends into the discharge hopper 2 and is sealed and rotated with the discharge hopper 2 via bearings and a sealing ring. The lead screw 9 is located directly below the rotating shaft 5 and rotates concentrically with the rotating shaft 5 via bearings. The relative rotation or stationary state of the lead screw 9 and the rotating shaft 5 is controlled by an automatic locking mechanism. The automatic locking mechanism can lock the lead screw 9 and the rotating shaft 5, so that the rotation of the rotating shaft 5 can be used to drive the lead screw 9 to rotate synchronously. Alternatively, the lead screw 9 and the rotating shaft 5 can be unlocked. At this time, due to the rotational engagement between the lead screw 9 and the rotating shaft 5, the lead screw 9 is stationary under the limit of the opening and closing element 22, so that the opening and closing element 22 is synchronously kept stationary.

[0043] Automatic locking mechanism reference Figure 4 As shown, the device includes a receiving groove 14 recessed at the upper end of the lead screw 9, an electromagnet 15 fixed to the bottom of the receiving groove 14, and a limiting groove 12 recessed at the bottom of the rotating shaft 5 opposite to the receiving groove 14. A limiting block 13 is telescopically provided in the receiving groove 14, which can be fully retracted into the receiving groove 14 or partially extended out of the receiving groove 14 to cooperate with the limiting groove 12. The extension and retraction of the limiting block 13 is controlled by the energization or de-energization of the electromagnet 15. A spring 16 is provided between the limiting block 13 and the electromagnet 15, with both ends fixed to both. When the electromagnet 15 is energized, the limiting block 13 retracts, and the lead screw 9 and the rotating shaft 5 are in an unlocked state. When the electromagnet 15 is de-energized, the limiting block 13 extends and cooperates with the limiting groove 12, and the lead screw 9 and the rotating shaft 5 are in a locked state.

[0044] When material enters the discharge bucket 2 from the mixing bucket 1 through the discharge port 10, it is in a tilted state and will inevitably adhere to the lead screw 9. This will cause the lead screw 9 to jam in the thread groove, and the material inside the thread of the lead screw 9 will also increase the probability of dust. Therefore, a self-cleaning mechanism is provided at the lower end of the opening and closing part 22 to automatically clean the lead screw 9 as it rotates. (Refer to...) Figure 4 As shown, the self-cleaning mechanism includes a cleaning brush 21 that is elastically press-fitted against a portion of the side wall of the lead screw 9 at the lower end of the opening and closing member 22, a rotating rod 20 that is sealed and rotates with the opening and closing member 22 at the upper end of the cleaning brush 21, and a linkage mechanism that drives the rotating rod 20 to extend and rotate as the lead screw 9 rotates between the rotating rod 20 and the lead screw 9.

[0045] The aforementioned cleaning brush 21 is made of sponge material. The rotating rod 20 includes a follower rotating rod 202 that rotates and moves synchronously with the opening and closing component 22, and a matching rotating rod 201 located at the upper end of the follower rotating rod 202 and cooperating with the lead screw 9. A matching hole is vertically penetrating the opening and closing component 22. The follower rotating rod 202 is inserted into the matching hole, and bearings and sealing rings are provided at both ends between the matching hole and the rotating rod, thereby achieving a smooth sealing rotational engagement. The lower end of the matching rotating rod 201 extends with a follower rotating rod 202. The lifting and lowering of the opening and closing member 22 is synchronized with the rotation of the follower rotating rod 202 and the telescopic rod is extended and retracted relative to the follower rotating rod 202. The telescopic rod includes a guide rod 203 extending downward from the lower end of the cooperating rotating rod 201 and inserted into the follower rotating rod 202, and a limiting section 204 fixed at the end of the guide rod 203 away from the cooperating rotating rod 201. A mating groove is recessed at the upper end of the follower rotating rod 202 to guide and cooperate with the guide rod 203 and prevent the limiting block 13 from slipping out. The cross-section of the guide rod 203 is non-circular, and in this embodiment it is rectangular.

[0046] Linkage mechanism reference Figures 4-6 As shown, the device includes a driven gear 18 concentrically fixed on the rotating rod 201 and a drive gear 17 concentrically fixed on the upper end of the lead screw 9 and meshing with the driven gear 18. After the driven gear 18 meshes with the drive gear 17, the rotating rod 201 can be driven to rotate as the lead screw 9 rotates. In this embodiment, the drive gear 17 is a large gear and the driven gear 18 is a small gear. Therefore, the cleaning brush 21 can rotate more than one revolution for every revolution of the lead screw 9, thereby improving the cleaning efficiency of the cleaning brush 21. Since the opening and closing member 22 is in a lifting and lowering state as the lead screw 9 rotates, the rotating rod 20 cannot be a single rod, but is composed of a telescopic follower rotating rod 202 and a rotating rod 201. It can extend and retract while rotating to adapt to the adjustment of the position of the opening and closing member 22. The cooperation between the guide rod 203 and the limiting block 13 and the mating groove can prevent the follower rotating rod 202 and the rotating rod 201 from disengaging from each other, and can also realize the synchronous rotation of the two.

[0047] A retaining part is provided on the lead screw 9 or the discharge hopper 2 to ensure that the rotating rod 201 rotates horizontally. The retaining part includes a limiting plate 19 located below the drive gear 17, which is concentric with the lead screw 9 and fits against the upper and lower end faces of the driven gear 18. In this embodiment, the limiting plate 19 structure is used. Since the follower rotating rod 202 only moves vertically up and down with the opening and closing member 22, the cooperating rotating rod 201 will not flip. The limiting plate 19 is sufficient to limit its vertical stroke. The extension stroke of the telescopic rod must be greater than the lifting stroke of the opening and closing member 22 to ensure that the rotating rod 20 as a whole is not damaged by the tension.

[0048] The aforementioned motor 4 is a servo motor 4. Both the electromagnet 15 and the servo motor 4 are connected to a controller (PLC). The following operation steps are implemented through the logic programming of the PLC:

[0049] 1. In the initial state, the opening and closing part 22 is lowered to be flush with the lower end of the discharge bucket 2. At this time, the discharge port 10 is blocked, the electromagnet 15 is energized, and the screw and the opening and closing part are both stationary.

[0050] 2. Mixing state: The drive motor 4 rotates forward, the rotating shaft 5 rotates forward synchronously, the stirring rod 6 stirs the material in the mixing barrel 1, the cutting blade 7 is in the state of cutting the material, and the scraper rod 8 is in the state of scraping the material from the inner wall of the mixing barrel 1.

[0051] 3. Discharge bucket 2 discharges: The driving electromagnet is de-energized. At this time, the limiting block 13 on the lead screw 9 rotates with the rotating shaft 5 until it is embedded in the limiting groove 12. The lead screw 9 and the rotating shaft 5 start to rotate synchronously. At this time, the opening and closing part 22 is in the rising state. During the rising process of the opening and closing part, the telescopic rod is in the retracted state. The cleaning brush 21 cleans the lead screw 9. After the opening and closing part rises to expose the discharge port 10, the electromagnet is energized, the limiting block retracts, and the lead screw and the rotating shaft switch to rotational engagement. At this time, the opening and closing part and the lead screw remain stationary.

[0052] 4. Discharge pause or discharge stop: The electromagnet is de-energized, causing the rotating shaft and lead screw to switch to synchronous rotation. At this time, the drive motor reverses, the rotating shaft 5 reverses synchronously, the opening and closing part 22 is in the lowering state, the telescopic rod is extended, and the cleaning brush 21 cleans the lead screw 9. Therefore, it can realize automatic scraping of material on the inner wall of the discharge bucket 2 and automatic brushing of material on the lead screw 9. When it is lowered to the lowest position, the electromagnet 15 is energized, and the opening and closing part 22 switches to the stationary state. The material brushed off in the above process is collected in the packaging bag, which not only avoids dust generation, but also makes reasonable use of this part of the material and reduces waste.

[0053] When it is necessary to reopen the discharge port 10, you can start from step 2 and cycle through steps 2-4 to repeatedly switch between discharging and stopping the discharge.

[0054] A dust cover 3 is fitted around the mixing hopper 1 and the discharge hopper 2. A first magnetic strip for securing the packaging bag is provided on the outer wall of the discharge hopper 2 and the lower outer wall of the dust cover 3. A first metal strip for magnetic attraction is fixed on the outer wall of the discharge hopper 2. The dust cover 3 is connected by a pull rope 11. A second magnetic strip is provided on the upper surface of the dust cover 3. A second metal strip for magnetic attraction is provided on the bottom of the mixing hopper 1. After pulling down the dust cover 3, it can cover the packaging bag to prevent dust from overflowing due to discharge. An air extraction pipe is provided on the dust cover 3 and is connected to the suction pipe (not shown) of a vacuum cleaner. The vacuum cleaner is used to remove any fine dust that may be present inside the dust cover 3 from the opening of the packaging bag.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixing device for cement mortar production, comprising a mixing tank (1) and a mixing mechanism, the mixing mechanism comprising a rotating shaft (5) vertically rotatably disposed within the mixing tank (1), a stirring rod (6) located on the rotating shaft (5), and a motor (4) located at the upper end of the mixing tank (1) for driving the rotating shaft (5) to rotate, characterized in that: A discharge bucket (2) with a non-circular cross-section is fixed to the lower end face of the mixing bucket (1). The discharge bucket (2) has an opening facing downward and extends out of the mixing bucket (1). The upper end of the discharge bucket (2) is closed and the side wall of the discharge bucket (2) is provided with a discharge port (10) inside the mixing bucket (1). A vertical elastic sealing lifting and lowering device (22) is provided inside the discharge bucket (2), which can open the discharge port (10) after rising and close the discharge port (10) after falling. After falling, the lower end face of the opening and closing device (22) is flush with the lower end of the discharge port (10). The lifting and stopping of the opening and closing device (22) is controlled by the rotation or stopping of a screw (9) that rotates concentrically with the rotating shaft (5). A threaded groove that cooperates with the screw (9) is fixed on the opening and closing device (22). The relative rotation or stopping of the screw (9) and the rotating shaft (5) is controlled by an automatic locking mechanism.

2. The mixing equipment for cement mortar production according to claim 1, characterized in that: The automatic locking mechanism includes a receiving groove (14) recessed at the upper end of the lead screw (9), an electromagnet (15) fixed at the bottom of the receiving groove (14), and a limiting groove (12) recessed at the bottom of the rotating shaft (5) and facing the receiving groove (14). A limiting block (13) is telescopically provided in the receiving groove (14), which can be fully retracted into the receiving groove (14) or partially extended out of the receiving groove (14) and cooperate with the limiting groove (12). The telescopic movement of the limiting block (13) is controlled by the energization or de-energization of the electromagnet (15). A spring (16) with both ends fixed to the limiting block (13) and the electromagnet (15) is provided between the limiting block (13) and the electromagnet (15).

3. A mixing device for cement mortar production according to claim 2, characterized in that: The lower end of the rotating shaft (5) extends into the discharge bucket (2) and is sealed and rotates with the discharge bucket (2). The screw (9) is located directly below the rotating shaft (5) and rotates with the rotating shaft (5).

4. A mixing device for cement mortar production according to claim 1, characterized in that: A self-cleaning mechanism is provided at the lower end of the opening and closing part (22) to automatically clean the lead screw (9) as it rotates. The self-cleaning mechanism includes a cleaning brush (21) that is elastically press-fitted to a partial side wall of the lead screw (9) at the lower end of the opening and closing part (22), a rotating rod (20) that is sealed and rotates with the opening and closing part (22) at the upper end of the cleaning brush (21), and a linkage mechanism that drives the rotating rod (20) to extend and rotate as it rotates with the lead screw (9) between the rotating rod (20) and the lead screw (9).

5. A mixing device for cement mortar production according to claim 4, characterized in that: The rotating rod (20) includes a follower rotating rod (202) that rotates and moves synchronously with the opening and closing member (22) and a cooperating rotating rod (201) located at the upper end of the follower rotating rod (202) and cooperating with the lead screw (9). The lower end of the cooperating rotating rod (201) extends a telescopic rod that rotates synchronously with the opening and closing member (22) and moves synchronously with the follower rotating rod (202) and moves relative to the follower rotating rod (202) at the same time.

6. A mixing device for cement mortar production according to claim 5, characterized in that: The linkage mechanism includes a driven gear (18) concentrically fixed on the rotating rod (201) and a drive gear (17) concentrically fixed on the upper end of the lead screw (9) and meshing with the driven gear (18). A retaining part is provided on the lead screw (9) to ensure that the rotating rod (201) rotates horizontally.

7. A mixing device for cement mortar production according to claim 6, characterized in that: The retaining part includes a limiting plate (19) disposed below the drive gear (17), which is concentric with the lead screw (9) and fits against the upper and lower end faces of the driven gear (18).

8. A mixing device for cement mortar production according to claim 7, characterized in that: A dust cover (3) is installed outside the mixing hopper (1) and outside the discharge hopper (2). An air extraction pipe is installed on the dust cover (3) and connected to the suction pipe of the vacuum cleaner.

9. A mixing device for cement mortar production according to claim 1, characterized in that: A crushing mechanism is provided on the stirring rod (6). The crushing mechanism includes several cutting blades (7) with different inclination angles fixed on the stirring rod (6). The cutting blade (7) has its blade part (701) on the rotating surface along the rotating shaft (5).

10. A mixing device for cement mortar production according to claim 1, characterized in that: Inside the mixing barrel (1), there is a scraper rod (8) extending vertically along the mixing barrel (1) and elastically abutting against the inner wall of the mixing barrel (1). The end of the scraper rod (8) near the rotating shaft (5) is fixedly connected to the end of the stirring rod (6) away from the rotating shaft (5).

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