Mixing and stirring equipment for gypsum mortar
The mixing and stirring device for gypsum mortar addresses low efficiency and quality issues by incorporating a screening assembly to filter large sand and a stirring assembly with sliding sleeves and blades for rapid, uniform mixing, enhancing mixing efficiency and quality.
Patent Information
- Application Number
- CN202420226320.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-31
AI Technical Summary
Existing gypsum mortar mixing equipment suffers from low mixing efficiency due to uneven mixing of raw materials and the inability to handle large-sized sand, leading to poor mixing quality and appearance issues.
A mixing and stirring device with a screening assembly to filter large-sized sand and a stirring assembly with vertically reciprocating sliding sleeves and blades for rapid mixing, ensuring even distribution of raw materials.
The device achieves rapid and efficient mixing of gypsum mortar ingredients while preventing large-sized sand from entering the mixing tank, resulting in improved mixing quality and uniformity.
Smart Images
Figure CN222201079U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gypsum mortar processing, in particular to a mixing and stirring device for gypsum mortar. Background Art
[0002] Mortar is a commonly used building material, generally used in masonry and plastering projects. Mortar is made by mixing cementitious materials (cement, lime, clay, etc.) and fine aggregate (sand) with water. Gypsum mortar is mainly made of lime paste, sand and water in a certain ratio and mixed with mixing equipment. It is generally used for masonry and plaster layers that do not require high strength and are not affected by moisture. It is an important material in the construction field.
[0003] The existing gypsum mortar mixing equipment has gradually exposed its shortcomings during use, mainly in the following aspects:
[0004] First, when adding raw materials into the equipment, they are added one by one according to the ratio. After adding, various raw materials exist in layers in the equipment. During the stirring process of the stirring equipment, the raw materials at the bottom of the equipment are not easy to be turned over to the top. Therefore, the stirring time required for the stirring equipment to evenly mix the internal raw materials is long, resulting in low mixing efficiency of the equipment and poor mixing effect.
[0005] Second, when preparing gypsum mortar, sand is usually poured directly into the equipment. However, the particle size of the sand directly affects the quality of the gypsum mortar. If the particle size of the sand used is too large, the prepared gypsum mortar will eventually appear uneven when applied to the wall, affecting the appearance.
[0006] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content
[0007] In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide a mixing and stirring device for gypsum mortar, which can achieve rapid mixing of different raw materials inside it, and has high mixing efficiency and good mixing effect;
[0008] The equipment can also screen large-sized sand to prevent large-sized sand from entering the equipment and improve the quality of gypsum mortar.
[0009] In order to solve the above problems, the utility model provides the following technical solutions:
[0010] A mixing and stirring device for gypsum mortar comprises a fixedly arranged mixing tank, a mixing assembly is arranged in the mixing tank, and a screening assembly connected to the inner cavity of the mixing tank is arranged on the upper outer wall of the mixing tank.
[0011] The stirring component can be used to quickly and evenly mix the raw materials in the stirring tank; the screening component can be used to screen the sand with large particle size to prevent it from entering the stirring tank;
[0012] The stirring assembly comprises a driving shaft coaxial with the stirring tank and rotatably arranged, a plurality of stirring blades symmetrically arranged along the axial section of the driving shaft are arranged vertically and side by side on the outer wall of the driving shaft, a plurality of sliding sleeves slidably connected to the driving shaft are sleeved on the outer wall of the driving shaft, the plurality of sliding sleeves are vertically reciprocatingly slidably arranged, and are alternately arranged with the plurality of stirring blades,
[0013] A plurality of horizontally arranged fixing plates are evenly distributed on the peripheral wall of the sliding sleeve along its circumference, and the opposite ends of the fixing plates are all V-shaped structures, and the tips are arranged opposite to each other.
[0014] A discharge valve connected to the inner cavity of the stirring tank is fixedly provided at the bottom of the stirring tank.
[0015] As an optimized solution, the screening assembly includes a fixed box with an opening at the bottom, a screening box is vertically reciprocatingly slidable in the fixed box, the top and bottom of the screening box are both opened, and a screening plate is fixed in the screening box to abut against its inner wall.
[0016] A feeding hopper connected to the inner cavity of the fixed box is fixedly provided on the top of the fixed box, and a lower hopper connected to the inner cavity of the fixed box is fixedly connected to the open end of the fixed box. The lower port of the lower hopper is connected to the inner cavity of the mixing tank.
[0017] As an optimized solution, the screening box is tilted downward at one end away from the mixing tank, and one end portion of the screening box is provided with a bypass groove that penetrates through it. The top surface of the bypass groove extends upward to the outside of the screening box, and the bottom surface of the bypass groove is flush with the top surface of the screen plate. A lifting plate is provided in the bypass groove for vertical lifting to control its opening and closing.
[0018] As an optimized solution, a U-shaped plate with an open end facing upward is fixedly provided at one end of the screening box, and the inner bottom surface of the U-shaped plate is flush with the bottom surface of the avoidance groove.
[0019] One end of the fixed box is provided with a rectangular groove extending therethrough, and a protection box with an opening at the bottom is fixedly provided at the end of the fixed box. The end of the protection box close to the fixed box is open.
[0020] One end of the U-shaped plate passes through the rectangular groove and extends into the interior of the protection box.
[0021] As an optimized solution, a driven plate is provided on the top of the stirring tank for vertical reciprocating lifting, and a rotating tube is vertically provided on the bottom of the driven plate for rotation connection therewith.
[0022] As an optimized solution, a rotating shaft rotatably connected to the top of the mixing tank is provided through the top, and the lower port of the rotating tube extends into the mixing tank through the rotating shaft and is coaxially fixed to the sliding sleeve located at the top. The rotating tube is vertically slidably connected to the rotating shaft, and several of the sliding sleeves are fixedly connected by connecting plates.
[0023] As an optimized solution, two sliding blocks arranged to slide back and forth horizontally are provided on the top of the mixing tank, and the tops of the two sliding blocks are hinged with swing plates, and the two swing plates are hinged with the driven plates.
[0024] As an optimized solution, two reciprocating screw rods rotatably arranged along a horizontal line are provided on the top of the mixing tank, and one end of the two reciprocating screw rods passes through two sliding blocks respectively and are correspondingly threadedly connected to the two sliding blocks.
[0025] As an optimized solution, the relative side walls of the screening box are slidably connected to the relative inner walls of the fixed box, and two limit brackets arranged opposite to each other are fixedly provided at the bottom of the screening box. A driven shaft rotatable along a horizontal line is provided at the bottom of the screening box, and two cams are fixedly inserted on the driven shaft, and the two cams are in frictional contact with the bottoms of the two limit brackets respectively.
[0026] As an optimized solution, two upper positioning plates are fixedly connected to the ends of the lifting plate, lower positioning plates are fixedly connected to the opposite side walls of the screening box, telescopic cylinders are fixedly provided on the lower positioning plates, and the telescopic ends of the two telescopic cylinders are fixedly connected to the two upper positioning plates accordingly.
[0027] Compared with the prior art, the beneficial effects of the utility model are:
[0028] 1. The stirring component can quickly mix different raw materials in the stirring tank, with high mixing efficiency and good mixing effect;
[0029] 2. The screening component can screen the large-sized sand to prevent the large-sized sand from entering the mixing tank, thereby improving the quality of the gypsum mortar. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0031] Figure 1 It is a schematic diagram of the structure of the utility model;
[0032] Figure 2 This is a schematic diagram of the structure of the stirring assembly of the utility model;
[0033] Figure 3 It is a structural schematic diagram of the screening assembly of the utility model;
[0034] Figure 4 It is a structural schematic diagram of a rectangular groove of the utility model;
[0035] Figure 5 It is a structural schematic diagram of the lower guide plate of the utility model.
[0036] In the figure: 1-mixing tank; 2-first drive motor; 3-sliding block; 4-swinging plate; 5-driving wheel; 6-reciprocating screw rod; 7-screening assembly; 8-control motor; 9-driven wheel; 10-transmission belt; 11-fixed bracket; 12-second drive motor; 13-discharge valve; 14-mixing blade; 15-driving shaft; 16-mixing assembly; 17-connecting plate; 18-sliding sleeve; 19-fixed plate; 20-lower guide plate; 21- Upper guide plate; 22-rotating tube; 23-driven plate; 24-rotating shaft; 25-driven shaft; 26-cam; 27-limiting bracket; 28-tension spring; 29-screening box; 30-fixed box; 31-feeding hopper; 32-upper positioning plate; 33-protection box; 34-screen plate; 35-lifting plate; 36-telescopic cylinder; 37-rectangular groove; 38-lower positioning plate; 39-limiting plate; 40-lower hopper; 41-avoidance groove; 42-U-shaped plate. DETAILED DESCRIPTION
[0037] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.
[0038] like Figures 1 to 5 As shown, a mixing device for gypsum mortar comprises a fixedly arranged mixing tank 1, a mixing assembly 16 is arranged in the mixing tank 1, and a screening assembly 7 connected to the inner cavity of the mixing tank 1 is arranged on the outer wall located at the top.
[0039] The raw materials in the mixing tank 1 can be quickly and evenly mixed by the stirring assembly 16; the large-size sand can be screened by the screening assembly 7 to prevent it from entering the mixing tank 1;
[0040] The stirring assembly 16 includes a driving shaft 15 which is coaxial with the stirring tank 1 and is rotatably arranged. A plurality of stirring blades 14 which are symmetrically arranged along the axial section of the driving shaft 15 are vertically arranged in parallel on the outer wall of the driving shaft 15. A plurality of sliding sleeves 18 which are slidably connected to the driving shaft 15 are sleeved on the outer wall of the driving shaft 15. The plurality of sliding sleeves 18 are vertically reciprocatingly slidably arranged and are alternately arranged with the plurality of stirring blades 14.
[0041] A plurality of horizontally arranged fixing plates 19 are evenly distributed on the peripheral wall of the sliding sleeve 18 along its circumference. The opposite ends of the fixing plates 19 are all V-shaped structures, and the tips are arranged opposite to each other.
[0042] A discharge valve 13 connected to the inner cavity of the mixing tank 1 is fixedly provided at the bottom of the mixing tank 1;
[0043] When the stirring blade 14 rotates, the fixed plate 19 rotates synchronously in the same direction, and at the same time, the fixed plate 19 slides back and forth vertically, and the fixed plate 19 can quickly stir the raw materials in the stirring tank 1 vertically, and with the cooperation of the stirring blade 14, the raw materials in the stirring tank 1 are quickly and evenly mixed.
[0044] The V-shaped structure can reduce the resistance of the fixed plate 19 when it rotates in the stirring tank 1.
[0045] The screening assembly 7 includes a fixed box 30 with an opening at the bottom, a screening box 29 is vertically reciprocatingly slidably arranged in the fixed box 30, the top and bottom of the screening box 29 are both opened, and a screening plate 34 is fixedly arranged in the screening box 29 to abut against the inner wall thereof.
[0046] A feeding hopper 31 connected to the inner cavity of the fixed box 30 is fixedly provided at the top of the fixed box 30, and a lower hopper 40 connected to the inner cavity of the fixed box 30 is fixedly connected to the open end of the fixed box 30. The lower end of the lower hopper 40 is connected to the inner cavity of the mixing tank 1.
[0047] The screen plate 34 can screen the sand in the screening box 29 when it slides vertically back and forth, and the sand with a qualified particle size enters the mixing tank 1 through the lower hopper 40.
[0048] The end of the screening box 29 away from the mixing tank 1 is tilted downward, and one end of the screening box 29 is provided with a through-set avoidance groove 41, the top surface of the avoidance groove 41 extends upward to the outside of the screening box 29, the bottom surface of the avoidance groove 41 is flush with the top surface of the sieve plate 34, and a lifting plate 35 is vertically lifted in the avoidance groove 41 to control its opening and closing.
[0049] When the lifting plate 35 rises, the avoidance groove 41 opens, and the sand with unqualified particle size on the surface of the screen plate 34 is discharged to the outside of the screening box 29 through the avoidance groove 41 under the action of gravity.
[0050] A U-shaped plate 42 with its opening facing upward is fixedly disposed at one end of the screening box 29, and the inner bottom surface of the U-shaped plate 42 is flush with the bottom surface of the avoidance groove 41.
[0051] A rectangular groove 37 is provided at one end of the fixed box 30, and a protection box 33 with an opening at the bottom is fixedly provided at the end of the fixed box 30. The end of the protection box 33 close to the fixed box 30 is open.
[0052] One end of the U-shaped plate 42 passes through the rectangular slot 37 and extends into the protection box 33 .
[0053] A driven plate 23 is provided on the top of the mixing tank 1 to vertically reciprocate and lift, and a rotating tube 22 is vertically provided at the bottom of the driven plate 23 to be rotatably connected thereto.
[0054] A rotating shaft 24 rotatably connected to the mixing tank 1 is provided through the top of the mixing tank 1. The lower end of the rotating tube 22 extends into the mixing tank 1 through the rotating shaft 24 and is coaxially fixed to the sliding sleeve 18 located at the top. The rotating tube 22 is vertically slidably connected to the rotating shaft 24, and several sliding sleeves 18 are fixedly connected by connecting plates 17.
[0055] An upper guide plate 21 and a lower guide plate 20 are fixedly connected to the outer walls of the rotating tube 22 and the driving shaft 15 , respectively. The ends of the upper guide plate 21 and the lower guide plate 20 extend into the rotating shaft 24 and the sliding sleeve 18 , respectively, and are slidably connected to the rotating shaft 24 and the sliding sleeve 18 .
[0056] Two sliding blocks 3 are arranged on the top of the mixing tank 1 to slide back and forth horizontally. The tops of the two sliding blocks 3 are hinged with swing plates 4, and the two swing plates 4 are hinged to the driven plate 23.
[0057] Two reciprocating screw rods 6 are arranged on the top of the mixing tank 1 and are rotatably arranged along a horizontal line. One end of the two reciprocating screw rods 6 passes through the two sliding blocks 3 respectively and is threadedly connected with the two sliding blocks 3 accordingly.
[0058] Two fixed brackets 11 symmetrically arranged along the axial section are fixedly provided on the outer wall of the mixing tank 1, and the two ends of the two reciprocating screw rods 6 are correspondingly rotatably connected to the two fixed brackets 11.
[0059] The same end of the two reciprocating screw rods 6 passes through one of the fixed brackets 11 and is fixedly connected to the driving wheel 5 and the driven wheel 9 respectively. The driving wheel 5 is connected to the driven wheel 9 through a transmission belt 10.
[0060] A first drive motor 2 is fixedly mounted on one of the fixed brackets 11 , and an output end of the first drive motor 2 is fixedly connected to the drive wheel 5 .
[0061] The bottoms of the two sliding blocks 3 are fixed with T-shaped slide plates, and the top of the mixing tank 1 is provided with T-shaped slide grooves matched with the T-shaped slide plates.
[0062] A second drive motor 12 is fixedly provided at the bottom of the stirring tank 1 , and the output of the second drive motor 12 passes through the stirring tank 1 and is fixedly connected to the drive shaft 15 .
[0063] The relative side walls of the screening box 29 are slidably connected to the relative inner walls of the fixed box 30. Two limit brackets 27 arranged opposite to each other are fixedly provided at the bottom of the screening box 29. A driven shaft 25 rotatably arranged along a horizontal line is provided below the screening box 29. Two cams 26 are fixedly inserted on the driven shaft 25. The two cams 26 are in frictional contact with the bottoms of the two limit brackets 27 respectively.
[0064] Four evenly distributed limit plates 39 are fixedly connected to the relative inner walls of the fixed box 30 and the bottom of the screening box 29. The tops of the four limit plates 39 on the fixed box 30 are fixedly connected to tension springs 28. One end of the four tension springs 28 extends upward and is fixedly connected to the four limit plates 39 on the screening box 29 accordingly.
[0065] A control motor 8 is fixedly mounted on the outer wall of the fixed box 30 , and an output end of the control motor 8 passes through the fixed box 30 and is fixedly connected to the driven shaft 25 .
[0066] The opposite side walls of the screening box 29 are fixedly provided with T-shaped slide plates, and the opposite inner walls of the fixed box 30 are provided with T-shaped slide grooves matched with the T-shaped slide plates.
[0067] The ends of the lifting plate 35 are fixedly connected to two upper positioning plates 32 , and lower positioning plates 38 are fixedly connected to the opposite side walls of the screening box 29 . Telescopic cylinders 36 are fixedly provided on the lower positioning plates 38 , and the telescopic ends of the two telescopic cylinders 36 are fixedly connected to the two upper positioning plates 32 .
[0068] The opposite side walls of the lifting plate 35 are fixedly provided with T-shaped slide plates, and the opposite inner walls of the screening box 29 are provided with T-shaped slide grooves matched with the T-shaped slide plates.
[0069] The working principle of this device is:
[0070] When adding sand into the mixing tank 1, sand is added into the screening box 29 through the feeding hopper 31, and the control motor 8 drives the driven shaft 25 and the two cams 26 to rotate. Under the pull of the four tension springs 28, the screening box 29 and the screen plate 34 slide back and forth vertically, and the screen plate 34 screens the sand in the screening box 29. Sand with qualified particle size enters the mixing tank 1 through the lower hopper 40, and sand with unqualified particle size is retained in the screening box 29. After the sand is added, the two telescopic cylinders 36 are extended and drive the lifting plate 35 to rise, and the avoidance groove 41 is opened. Under the action of gravity, the unqualified sand is discharged to the collection container outside the fixed box 30 through the avoidance groove 41 and the U-shaped plate 42, thereby realizing the function of screening the sand with large particle size, preventing the sand with large particle size from entering the mixing tank 1, and improving the quality of the gypsum mortar;
[0071] After the raw materials are added, the first drive motor 2 drives the drive shaft 15 and the stirring blade 14 to rotate, and the drive shaft 15 drives the sliding sleeve 18, the fixed plate 19, the rotating tube 22 and the rotating shaft 24 to rotate. At the same time, the second drive motor 12 drives the driving wheel 5, the transmission belt 10, the driven wheel 9 and the two reciprocating screws 6 to rotate, thereby controlling the two sliding blocks 3 to slide back and forth horizontally. With the cooperation of the swing plate 4, the driven plate 23 slides back and forth vertically, thereby driving the rotating tube 22, the sliding sleeve 18 and the fixed plate 19 to slide back and forth vertically. The fixed plate 19 vertically stirs the raw materials in the stirring tank 1, and the stirring blade 14 stirs the raw materials in the stirring tank 1, thereby realizing the function of quickly mixing different raw materials in the stirring tank 1, and the mixing efficiency is high and the mixing effect is good.
[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.
Claims
1. A mixing and stirring device for gypsum mortar, characterized in that: The invention comprises a fixedly arranged stirring tank (1), wherein a stirring assembly (16) is arranged in the stirring tank (1), and a screening assembly (7) which is in communication with the inner cavity of the stirring tank (1) is arranged on the upper outer wall of the stirring tank (1). The stirring component (16) can be used to quickly and evenly mix the raw materials in the stirring tank (1); the screening component (7) can be used to screen sand with large particle sizes to prevent it from entering the interior of the stirring tank (1); The stirring assembly (16) comprises a driving shaft (15) which is coaxial with the stirring tank (1) and is rotatably arranged. A plurality of stirring blades (14) which are symmetrically arranged along the axial cross section of the driving shaft (15) are vertically arranged in parallel on the outer wall of the driving shaft (15). A plurality of sliding sleeves (18) which are slidably connected to the driving shaft (15) are sleeved on the outer wall of the driving shaft (15). The plurality of sliding sleeves (18) are vertically reciprocatingly slidably arranged and are alternately arranged with the plurality of stirring blades (14). A plurality of horizontally arranged fixing plates (19) are evenly distributed along the circumference of the peripheral wall of the sliding sleeve (18), and the opposite ends of the fixing plates (19) are all V-shaped structures, and the tips are arranged opposite to each other. A discharge valve (13) communicating with the inner cavity of the stirring tank (1) is fixedly provided at the bottom of the stirring tank (1).
2. A mixing and stirring device for gypsum mortar according to claim 1, characterized in that: The screening assembly (7) comprises a fixed box (30) with an opening at the bottom, a screening box (29) is arranged in the fixed box (30) for vertical reciprocating sliding, the top and the bottom of the screening box (29) are both opened, and a screening plate (34) is fixedly arranged in the screening box (29) to abut against the inner wall thereof. A feeding hopper (31) connected to the inner cavity of the fixed box (30) is fixedly provided at the top of the fixed box (30) above the screening box (29), and a lower hopper (40) connected to the inner cavity of the fixed box (30) is fixedly connected to the open end of the fixed box (30), and the lower port of the lower hopper (40) is connected to the inner cavity of the mixing tank (1).
3. A mixing and stirring device for gypsum mortar according to claim 2, characterized in that: The screening box (29) is arranged to be tilted downward at one end away from the mixing tank (1), and a bypass groove (41) is provided at one end of the screening box (29). The top surface of the bypass groove (41) extends upward to the outside of the screening box (29), and the bottom surface of the bypass groove (41) is flush with the top surface of the sieve plate (34). A lifting plate (35) is provided in the bypass groove (41) to control its opening and closing.
4. A mixing and stirring device for gypsum mortar according to claim 3, characterized in that: A U-shaped plate (42) with an open end facing upward is fixedly disposed at one end of the screening box (29), and the inner bottom surface of the U-shaped plate (42) is flush with the bottom surface of the avoidance groove (41). A rectangular groove (37) is provided at one end of the fixed box (30), and a protection box (33) with an open bottom is fixedly provided at the end of the fixed box (30). The end of the protection box (33) close to the fixed box (30) is open. One end of the U-shaped plate (42) passes through the rectangular groove (37) and extends into the interior of the protection box (33).
5. A mixing and stirring device for gypsum mortar according to claim 4, characterized in that: A driven plate (23) is provided on the top of the stirring tank (1) for vertical reciprocating lifting, and a rotating tube (22) is provided on the bottom of the driven plate (23) for vertical rotation connection therewith.
6. A mixing and stirring device for gypsum mortar according to claim 5, characterized in that: A rotating shaft (24) rotatably connected to the top of the mixing tank (1) is provided through the top, the lower end of the rotating tube (22) passes through the rotating shaft (24) and extends into the mixing tank (1), and is coaxially fixedly connected to the sliding sleeve (18) located at the top, the rotating tube (22) is vertically slidably connected to the rotating shaft (24), and a plurality of the sliding sleeves (18) are fixedly connected via a connecting plate (17).
7. A mixing and stirring device for gypsum mortar according to claim 6, characterized in that: The top of the mixing tank (1) is provided with two sliding blocks (3) which are arranged to slide back and forth horizontally. The tops of the two sliding blocks (3) are both hinged with swing plates (4), and the two swing plates (4) are both hinged with a driven plate (23).
8. A mixing and stirring device for gypsum mortar according to claim 7, characterized in that: Two reciprocating screw rods (6) are arranged to rotate along a horizontal line on the top of the mixing tank (1), and one end of the two reciprocating screw rods (6) passes through two sliding blocks (3) respectively and is threadedly connected to the two sliding blocks (3) accordingly.
9. A mixing and stirring device for gypsum mortar according to claim 8, characterized in that: The opposite side walls of the screening box (29) are slidably connected to the opposite inner walls of the fixed box (30); two limit brackets (27) arranged opposite to each other are fixedly provided at the bottom of the screening box (29); a driven shaft (25) rotatably arranged along a horizontal line is provided below the screening box (29); two cams (26) are fixedly inserted on the driven shaft (25); and the two cams (26) are in frictional contact with the bottoms of the two limit brackets (27) respectively.
10. A mixing and stirring device for gypsum mortar according to claim 9, characterized in that: The end of the lifting plate (35) is fixedly connected to two upper positioning plates (32), and the opposite side walls of the screening box (29) are fixedly connected to lower positioning plates (38). Telescopic cylinders (36) are fixedly provided on the lower positioning plates (38), and the telescopic ends of the two telescopic cylinders (36) are fixedly connected to the two upper positioning plates (32) respectively.