Mixing and spraying device for manufacturing light building materials

Abstract

The invention relates to the technical field of spraying machines, and discloses a mixed spraying device for manufacturing light building materials, the mixed spraying device comprises a plunger type spraying machine main body, coating barrels are mounted on the two sides of the plunger type spraying machine main body, three positioning plates distributed at equal intervals are fixedly connected to the inner walls of the coating barrels, a positioning block is slidably connected to each positioning plate, and the plunger type spraying machine main body is fixedly connected with the plunger type spraying machine main body. A barrel cover slidably connected with the coating barrel is arranged among the three positioning blocks, sliding grooves are formed in the positions, close to the positioning plates, of the outer wall of the barrel cover, and sliding blocks are slidably connected into the sliding grooves. According to the mixed spraying device for manufacturing the light building materials, after paint is injected into the paint bucket, the paint bucket only needs to be covered with the bucket cover, after the paint in the paint bucket is pulled out by the plunger type spraying machine body, the pressure in the paint bucket can be reduced, and under the action of the atmospheric pressure, the bucket cover can automatically move downwards, so that the paint in the paint bucket is sprayed out of the plunger type spraying machine body. And in the downward moving process, the coating adhering to the inner wall of the coating barrel is scraped off through an arc plate and a positioning block, and waste of the coating is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of spraying machines, in particular to a mixing spraying device for manufacturing lightweight building materials. Background Art

[0002] Lightweight building materials, known for their low density, have many advantages such as portability, ease of processing and efficient transportation. Such materials are widely used in the field of lightweight construction, especially in the construction of walls, floors and roofs. In the entire production process of lightweight building materials, mixing spraying devices (such as plunger sprayers) are often used as an auxiliary tool to assist in completing related operations.

[0003] For example, the patent with the patent authorization announcement number CN118831762B discloses an electrically controlled plunger sprayer, including a mounting frame, a plunger sprayer body and a three-port outer tube. In this electrically controlled plunger sprayer, a three-port outer tube, a single-port swivel, a three-port sealing sleeve ring and a core valve are sequentially arranged on the three-port liquid inlet pipe. By electrically controlling and rotating the single-port swivel and the core valve, the spraying mode and the self-cleaning mode can be switched, and the self-cleaning process can be automatically completed during the frequent reciprocating switching of two coatings, saving a large number of cleaning steps and improving the cleaning effect. In addition, a dual-channel structure is arranged inside the delivery pipe to deliver two different coatings separately. When switching between two different coatings for self-cleaning, the cleaning time can be greatly reduced; it overcomes the disadvantages of the existing plunger sprayer that it can only pump and spray one coating during frequent single working processes, and it is inconvenient to reciprocate and switch between two different coatings.

[0004] Although the plunger sprayer in the above patent is convenient for reciprocating switching between two different coatings, it still has certain defects: At present, plunger sprayers are mainly used for spraying high-viscosity paints. Due to their high viscosity characteristics, this type of paint easily sticks to the inner wall of the paint box. This phenomenon not only directly leads to waste of paint and increases material costs, but also further increases labor costs and time costs due to the need to frequently replace or replenish paint. Frequent handling of paint stickiness problems will undoubtedly interrupt the originally smooth construction process, have an adverse effect on overall work efficiency, and thus hinder the improvement of spraying efficiency. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a mixing spraying device for manufacturing lightweight building materials, which can automatically scrape off the paint sticking to the inner wall of the paint bucket to reduce the waste of paint.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mixing spraying device for manufacturing lightweight building materials, comprising a plunger sprayer main body, paint buckets are installed on both sides of the plunger sprayer main body, the inner wall of the paint bucket is fixedly connected with three equidistantly distributed positioning plates, each positioning plate is slidably connected with a positioning block, a bucket cover slidably connected to the paint bucket is provided between the three positioning blocks, a slide groove is provided on the outer wall of the bucket cover near the positioning plate, a slider is slidably connected in the slide groove, the side wall of the slider is fixedly connected to the positioning block, chamfers are provided at both ends of the top of the positioning block, an arc plate is provided between every two positioning blocks, the arc plate is located at the bottom of the bucket cover, and the arc plate is slidably connected to the bucket cover, a pushing assembly is connected between the arc plate and the positioning block, an elastic cushion layer is fixedly connected to the arc plate and the positioning block on one side close to the inner wall of the paint bucket, and internal and external pressure balancing assemblies are connected to both sides of the bucket cover.

[0007] Furthermore, the pushing assembly includes an outward pushing extrusion block and a wedge block. The lower ends of both sides of the positioning block are fixedly connected with an outward pushing extrusion block, and both ends of the arc plate are fixedly connected with a wedge block. The end of the wedge block is an inverted trapezoid, and the outward pushing extrusion block matches the wedge block.

[0008] Furthermore, a storage groove is provided at the bottom of the barrel cover, an anti-slip groove is provided at the end of the storage groove, an anti-slip rod is slidably connected to the inside of the anti-slip groove, one end of the anti-slip rod is fixedly connected to a connecting block, the connecting block is fixedly connected to the arc plate, and a pull-back elastic member is sleeved on the outside of one end of the anti-slip rod close to the connecting block, one end of the pull-back elastic member is fixedly connected to the side wall of the connecting block, and the other end of the pull-back elastic member is fixedly connected to the inner wall of the storage groove.

[0009] Furthermore, a connecting ring is provided in the middle of the positioning block, the three positioning blocks are all fixedly connected to the connecting ring, and a connecting plate is fixedly connected to the middle of the connecting ring.

[0010] Furthermore, a gripping block is rotatably connected to the middle position of the barrel cover, the gripping block is in an I-shape, hook blocks are fixedly connected to both sides of the upper end of the gripping block, and both ends of the connecting plate are in a "J" shape.

[0011] Furthermore, the upper end of the gripping block is rotatably connected to an upper swivel, the middle position of the connecting plate is rotatably connected to a lower swivel, the upper end of the gripping block is sleeved with a reset elastic member, the reset elastic member is located between the upper swivel and the lower swivel, the upper end of the reset elastic member is fixedly connected to the upper swivel, and the lower end of the reset elastic member is fixedly connected to the lower swivel.

[0012] Furthermore, the internal and external pressure balancing component includes a sealing block and a pull-down elastic member. A ventilation hole is provided on the barrel cover, and a sealing block is slidably connected in the ventilation hole. A pull-down elastic member is sleeved on the upper end of the sealing block, and the upper end of the pull-down elastic member is fixedly connected to the sealing block, and the lower end of the pull-down elastic member is fixedly connected to the barrel cover. A ventilation groove is provided on the surrounding side of the middle position of the sealing block.

[0013] Furthermore, a chamfer is provided at an edge position of the bottom of the sealing block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This kind of mixed spraying device for manufacturing lightweight building materials, after injecting the paint into the paint bucket, only needs to cover the paint bucket with the bucket cover and pull the positioning block upward, the positioning block will push the arc plate out through the pushing component, and use the side wall of the arc plate to stick to the inner wall of the paint bucket, so as to complete the sealing of the paint bucket. After the paint in the paint bucket is drawn out by the plunger sprayer body, the pressure in the paint bucket will decrease. Under the action of atmospheric pressure, the bucket cover will move downward by itself, and in the process of moving downward, the paint sticking to the inner wall of the paint bucket will be scraped off by the arc plate and the positioning block, thereby reducing the waste of paint.

[0015] 2. This type of mixing spray device used to manufacture lightweight building materials, after the paint in the paint bucket is used up, only the internal and external pressure balance components need to be opened, and then the bucket cover is lifted up and taken out to add paint. In order to reduce the friction between the bucket cover and the paint bucket, the positioning block can be pushed downward to allow the arc plate to lose the restriction of the pushing component, and then the arc plate will be separated from the inner wall of the paint bucket, making it convenient to take out the bucket cover.

[0016] 3. This type of mixing spraying device used to manufacture lightweight building materials, after pulling the positioning block upwards so that the side wall of the arc plate is close to the inner wall of the paint bucket, the gripping block can be rotated to hang the hook block on the connecting plate, thereby preventing the positioning block from moving downward by itself, causing the arc plate to lose its restriction and return to its original position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A partial cross-sectional view of the present invention as a whole; Figure 3 For the present invention Figure 2 A schematic diagram of the local enlarged structure at point A in the middle; Figure 4 For the present invention Figure 2 A schematic diagram of the local enlarged structure at B in the middle; Figure 5 It is a schematic diagram of the connection structure between the barrel cover and the positioning block of the present invention; Figure 6 It is a bottom view of the barrel cover and the positioning block of the present invention; Figure 7 It is a partial cross-sectional view of the barrel cover of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the local enlarged structure at C in the middle; Fig. 9It is a structural schematic diagram of the positioning block of the present invention; Fig.10 A bottom view of the positioning block of the present invention; Fig.11 It is a structural schematic diagram of the arc plate of the present invention; Fig.12 It is a schematic diagram of the connection structure between the barrel cover and the gripping block of the present invention; Fig.13 A bottom view of the barrel cover and the gripping block of the present invention; Fig.14 It is a structural schematic diagram of the gripping block of the present invention.

[0018] In the figure: 1. plunger sprayer body; 2. paint bucket; 3. positioning plate; 4. bucket cover; 5. slide groove; 6. slider; 7. positioning block; 8. elastic cushion; 9. connecting ring; 10. connecting plate; 11. push-out extrusion block; 12. storage groove; 13. anti-slip groove; 14. anti-slip rod; 15. pull-back elastic member; 16. connecting block; 17. arc plate; 18. wedge block; 19. gripping block; 20. hook block; 21. sealing block; 22. ventilation groove; 23. ventilation hole; 24. pull-down elastic member; 25. upper swivel; 26. lower swivel; 27. reset elastic member. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] See also Figures 1 to 14 , a mixing spraying device for manufacturing lightweight building materials, comprising a plunger sprayer body 1, a paint bucket 2 is installed on both sides of the plunger sprayer body 1, the inner wall of the paint bucket 2 is fixedly connected with three equidistantly distributed positioning plates 3, each positioning plate 3 is slidably connected with a positioning block 7, a bucket cover 4 slidably connected to the paint bucket 2 is provided between the three positioning blocks 7, a slide groove 5 is provided on the outer wall of the bucket cover 4 near the positioning plate 3, a slider 6 is slidably connected in the slide groove 5, the side wall of the slider 6 is fixedly connected to the positioning block 7, chamfers are provided at both ends of the top of the positioning block 7, an arc plate 17 is provided between every two positioning blocks 7, the arc plate 17 is located at the bottom of the bucket cover 4, and the arc plate 17 is slidably connected to the bucket cover 4, a pushing component is connected between the arc plate 17 and the positioning block 7, an elastic cushion layer 8 is fixedly connected to the arc plate 17 and the positioning block 7 on one side close to the inner wall of the paint bucket 2, and internal and external pressure balancing components are connected to both sides of the bucket cover 4.

[0021] The mixed spraying device for manufacturing lightweight building materials of the present invention, after injecting the paint into the paint bucket 2, only needs to align the positioning block 7 on the side of the bucket cover 4 with the positioning plate 3, then put the bucket cover 4 into the paint bucket 2, and pull the positioning block 7 upward, the positioning block 7 will push the arc plate 17 out through the pushing component, and use the side wall of the arc plate 17 to stick to the inner wall of the paint bucket 2, so that the interior of the paint bucket 2 is in a closed environment, and after the paint in the paint bucket 2 is extracted by the plunger sprayer body 1, the amount of paint in the paint bucket 2 is reduced, and the pressure will be reduced accordingly. Under the action of the external atmospheric pressure, the bucket cover 4 will be pushed downward by the atmospheric pressure, and in the process of moving downward, the bucket cover 4 will be pushed downward by the atmospheric pressure. The cover 4 will scrape the paint stuck on the inner wall of the paint bucket 2 through the arc plate 17 and the positioning block 7, thereby reducing the amount of paint stuck on the inner wall of the paint bucket 2 and avoiding paint wastage. In addition, the positioning block 7 and the arc plate 17 are fixedly connected with an elastic cushion layer 8 on one side close to the inner wall of the paint bucket 2, so that the positioning block 7 and the arc plate 17 can better fit the inner wall of the paint bucket 2, thereby improving the scraping effect of the paint stuck on the inner wall of the paint bucket 2. In addition, the structure of the plunger sprayer body 1 and the paint bucket 2 in the present invention is similar to the prior art, and the patent with patent authorization announcement number CN118831762B discloses an electrically controlled plunger sprayer structure, so it will not be elaborated on here.

[0022] As a preferred technical solution of the present invention, the pushing component includes an outward pushing extrusion block 11 and a wedge block 18. The lower ends of both sides of the positioning block 7 are fixedly connected with the outward pushing extrusion blocks 11, and the two ends of the arc plate 17 are fixedly connected with the wedge blocks 18. The end of the wedge block 18 is an inverted trapezoid, and the outward pushing extrusion block 11 matches the wedge block 18.

[0023] Specifically, when the bucket cover 4 remains stationary and the positioning block 7 is pulled upward, the positioning block 7 will drive the outward pushing and squeezing block 11 to move upward together, and the outward pushing and squeezing block 11 will push the wedge block 18 to move away from the center of the paint bucket 2, and the wedge block 18 will drive the arc plate 17 to move away from the center of the paint bucket 2 until the side wall of the positioning block 7 abuts against the side wall of the arc plate 17. At this time, the positioning block 7 is difficult to pull upward, and the side wall of the arc plate 17 will also abut against the inner wall of the paint bucket 2, so that the paint bucket 2 can be sealed.

[0024] As a preferred technical solution of the present invention, a storage groove 12 is provided at the bottom of the barrel cover 4, and an anti-slip groove 13 is provided at the end of the storage groove 12. An anti-slip rod 14 is slidably connected inside the anti-slip groove 13, and one end of the anti-slip rod 14 is fixedly connected to a connecting block 16, and the connecting block 16 is fixedly connected to the arc plate 17. A pull-back elastic member 15 is sleeved on the outside of the anti-slip rod 14 near one end of the connecting block 16, and one end of the pull-back elastic member 15 is fixedly connected to the side wall of the connecting block 16, and the other end of the pull-back elastic member 15 is fixedly connected to the inner wall of the storage groove 12.

[0025] Specifically, when the bucket cover 4 remains stationary and the positioning block 7 moves downward, the outward extrusion block 11 will leave the wedge block 18, and the wedge block 18 and the arc plate 17 will lose their restrictions. At this time, the pull-back elastic member 15 loses its restrictions and pulls the arc plate 17 away from the inner wall of the paint bucket 2, thereby separating the arc plate 17 from the inner wall of the paint bucket 2, which will save effort and be more convenient when moving the bucket cover 4.

[0026] As a preferred technical solution of the present invention, a connecting ring 9 is provided in the middle of the positioning block 7 , and the three positioning blocks 7 are all fixedly connected to the connecting ring 9 . A connecting plate 10 is fixedly connected to the middle of the connecting ring 9 .

[0027] As a preferred technical solution of the present invention, a gripping block 19 is rotatably connected to the middle position of the barrel cover 4. The gripping block 19 is I-shaped, and hook blocks 20 are fixedly connected to both sides of the upper end of the gripping block 19. Both ends of the connecting plate 10 are in the shape of a "J".

[0028] Specifically, after the bucket cover 4 and the positioning block 7 are inside the paint bucket 2, if the paint bucket 2 needs to be sealed, at this time, you only need to rotate the gripping block 19 first to stagger the gripping block 19 and the connecting plate 10, then press the top of the gripping block 19 with the palm of one hand, and then use the fingers of the hand to pull the connecting plate 10 upward until the connecting plate 10 cannot be pulled (at this time, the side wall of the positioning block 7 will be against the side wall of the arc plate 17), then rotate the palm to make the gripping block 19 overlap with the connecting plate 10 (this action is manifested as clenching the hand against the gripping block 19), during the overlapping process, the hooking block 20 will be stuck in the "J" shaped position of the connecting plate 10, so that the connecting plate 10 will not move down by itself, and since the positioning block 7 is connected to the connecting plate 10 through the connecting ring 9, the position of the positioning block 7 will also be fixed to prevent the positioning block 7 from moving down by itself.

[0029] As a preferred technical solution of the present invention, the upper end of the gripping block 19 is rotatably connected to the upper swivel 25, and the middle position of the connecting plate 10 is rotatably connected to the lower swivel 26. The upper end of the gripping block 19 is sleeved with a reset elastic member 27, and the reset elastic member 27 is located between the upper swivel 25 and the lower swivel 26. The upper end of the reset elastic member 27 is fixedly connected to the upper swivel 25, and the lower end of the reset elastic member 27 is fixedly connected to the lower swivel 26.

[0030] Specifically, when the positioning block 7 needs to be moved downward, it is only necessary to rotate the grasping block 19 to offset the hooking block 20 from the connecting plate 10. Then, under the action of the reset elastic member 27, the connecting plate 10 and the connecting ring 9 will move downward, and the connecting ring 9 will drive the positioning block 7 to move downward, so that the entire operation process can be simpler and more convenient.

[0031] As a preferred technical solution of the present invention, the internal and external pressure balance component includes a sealing block 21 and a pull-down elastic member 24. A vent hole 23 is provided on the barrel cover 4. The sealing block 21 is slidably connected in the vent hole 23. The upper end of the sealing block 21 is sleeved with a pull-down elastic member 24. The upper end of the pull-down elastic member 24 is fixedly connected to the sealing block 21, and the lower end of the pull-down elastic member 24 is fixedly connected to the barrel cover 4. A vent groove 22 is provided on the surrounding side of the middle position of the sealing block 21.

[0032] Specifically, the air hole 23 is located directly below the connecting plate 10. After the gripping block 19 is offset from the connecting plate 10, the lower end of the gripping block 19 will also be offset from the air hole 23. At this time, the sealing block 21 will lose its restriction. Under the action of the pull-down elastic member 24, the sealing block 21 will move downward, and the top and bottom of the bucket cover 4 will be connected through the air hole 23 and the air groove 22, so that the outside air can enter the paint bucket 2, thereby facilitating the movement of the bucket cover 4.

[0033] As a preferred technical solution of the present invention, the edge of the bottom of the sealing block 21 is chamfered.

[0034] Specifically, when the gripping block 19 rotates to overlap with the connecting plate 10, the gripping block 19 will squeeze the sealing block 21 back into the air vent 23, and the air vent 23 will be sealed by the sealing block 21, thereby separating the top and bottom of the bucket cover 4, so as to form a closed environment in the paint bucket 2.

[0035] Working principle: After the paint is injected into the paint bucket 2, first align the positioning block 7 on the side of the bucket cover 4 with the positioning plate 3, then put the bucket cover 4 into the paint bucket 2, then turn the gripping block 19 to stagger the gripping block 19 with the connecting plate 10, then press the top of the gripping block 19 with the palm of one hand, and then use the fingers of the hand to pull the connecting plate 10 upward (when the connecting plate 10 moves upward, the connecting plate 10 will drive the positioning block 7 to move upward synchronously through the connecting ring 9, and when the positioning block 7 moves upward, it will push the arc plate 17 toward the inner wall of the paint bucket 2 through the pushing component), until the connecting plate 10 can no longer be pulled (at this time, the side wall of the positioning block 7 will be against the side wall of the arc plate 17), then turn and hold the palm (when the palm is turned, the gripping block 19 will rotate synchronously When the paint in the paint bucket 2 is used up, it is only necessary to rotate the gripping block 19 (after the gripping block 19 is staggered with the connecting plate 10 and the air vent 23, firstly, under the action of the pull-down elastic member 24, the sealing block 21 will move downward, and the top and bottom of the bucket cover 4 will be connected through the air vent 23 and the air vent groove 22, so that the outside air can enter the paint bucket 2, and then under the action of the reset elastic member 27, the connecting plate 10 and the connecting ring 9 will move downward, and the connecting ring 9 will drive the positioning block 7 to move downward, and the arc plate 17 will also be away from the inner wall of the paint bucket 2 after losing its restriction), and the bucket cover 4 can be taken out relatively easily.

[0036] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A mixing spraying device for manufacturing lightweight building materials, comprising a plunger spraying machine body (1), with paint buckets (2) installed on both sides of the plunger spraying machine body (1), characterized in that: The inner wall of the paint bucket (2) is fixedly connected with three equidistantly distributed positioning plates (3), each positioning plate (3) is slidably connected with a positioning block (7), a bucket cover (4) slidably connected to the paint bucket (2) is provided between the three positioning blocks (7), a slide groove (5) is provided at a position of the outer wall of the bucket cover (4) close to the positioning plate (3), a slider (6) is slidably connected in the slide groove (5), a side wall of the slider (6) is fixedly connected to the positioning block (7), both ends of the top of the positioning block (7) are chamfered, an arc plate (17) is provided between every two positioning blocks (7), the arc plate (17) is located at the bottom of the bucket cover (4), and the arc plate (17) is slidably connected to the bucket cover (4), a pushing component is connected between the arc plate (17) and the positioning block (7), an elastic cushion layer (8) is fixedly connected to one side of the arc plate (17) and the positioning block (7) close to the inner wall of the paint bucket (2), and both sides of the bucket cover (4) are connected to internal and external pressure balancing components.

2. A mixing spraying device for manufacturing lightweight building materials according to claim 1, characterized in that: The pushing assembly comprises an outward pushing and squeezing block (11) and a wedge-shaped block (18). The lower ends of both sides of the positioning block (7) are fixedly connected to the outward pushing and squeezing blocks (11). Both ends of the arc plate (17) are fixedly connected to the wedge-shaped blocks (18). The end of the wedge-shaped block (18) is in an inverted trapezoidal shape. The outward pushing and squeezing block (11) matches the wedge-shaped block (18).

3. A mixing spraying device for manufacturing lightweight building materials according to claim 1, characterized in that: The bottom of the barrel cover (4) is provided with a storage groove (12), the end of the storage groove (12) is provided with an anti-slip groove (13), the interior of the anti-slip groove (13) is slidably connected with an anti-slip rod (14), one end of the anti-slip rod (14) is fixedly connected to a connecting block (16), the connecting block (16) is fixedly connected to an arc plate (17), and the outer portion of the anti-slip rod (14) near one end of the connecting block (16) is sleeved with a pull-back elastic member (15), one end of the pull-back elastic member (15) is fixedly connected to a side wall of the connecting block (16), and the other end of the pull-back elastic member (15) is fixedly connected to an inner wall of the storage groove (12).

4. A mixing spraying device for manufacturing lightweight building materials according to claim 1, characterized in that: A connecting ring (9) is provided in the middle of the positioning block (7), the three positioning blocks (7) are all fixedly connected to the connecting ring (9), and a connecting plate (10) is fixedly connected to the middle of the connecting ring (9).

5. A mixing spraying device for manufacturing lightweight building materials according to claim 4, characterized in that: A gripping block (19) is rotatably connected to the middle of the barrel cover (4), the gripping block (19) is in an I-shape, hooking blocks (20) are fixedly connected to both sides of the upper end of the gripping block (19), and both ends of the connecting plate (10) are in a "J" shape.

6. A mixing spraying device for manufacturing lightweight building materials according to claim 5, characterized in that: The upper end of the gripping block (19) is rotatably connected to an upper swivel ring (25), and the middle position of the connecting plate (10) is rotatably connected to a lower swivel ring (26). The upper end of the gripping block (19) is sleeved with a reset elastic member (27), and the reset elastic member (27) is located between the upper swivel ring (25) and the lower swivel ring (26). The upper end of the reset elastic member (27) is fixedly connected to the upper swivel ring (25), and the lower end of the reset elastic member (27) is fixedly connected to the lower swivel ring (26).

7. A mixing spraying device for manufacturing lightweight building materials according to claim 1, characterized in that: The internal and external pressure balancing assembly comprises a sealing block (21) and a pull-down elastic member (24); a vent hole (23) is provided on the barrel cover (4); the sealing block (21) is slidably connected in the vent hole (23); the upper end of the sealing block (21) is sleeved with the pull-down elastic member (24); the upper end of the pull-down elastic member (24) is fixedly connected to the sealing block (21); the lower end of the pull-down elastic member (24) is fixedly connected to the barrel cover (4); and a vent groove (22) is provided around the middle of the sealing block (21).

8. A mixing spraying device for manufacturing lightweight building materials according to claim 7, characterized in that: The edge of the bottom of the sealing block (21) is chamfered.

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