阅读说明：本技术 一种混凝土粉料储存装置 (Concrete powder storage device ) 是由 朱华 高利棠 陈燕 于 2021-09-25 设计创作，主要内容包括：本申请涉及一种混凝土粉料储存装置,属于混凝土粉料罐的技术领域,其包括粉罐、固定于粉罐外周面的进料管以及固定于进料管底端的集料箱,集料箱侧壁铰接有盖板,盖板一侧铰接有连杆,连杆远离盖板一端铰接有滑块,滑块沿竖向与集料箱侧壁滑移连接；滑块顶端固定有弹簧一,集料箱远离排风泵一侧固定有连接片一,弹簧一顶端与连接片一底面固定连接；集料箱侧壁沿自身宽度方向滑移连接有限位片；滑块远离盖板一侧开设有用于与限位片插接的插接槽；集料箱侧壁设置有用于解除对滑块限位的释放组件。本申请具有减少集料箱内粉料容易溢出情况的发生。(The application relates to a concrete powder storage device, which belongs to the technical field of concrete powder tanks and comprises a powder tank, a feed pipe fixed on the peripheral surface of the powder tank and a material collecting box fixed at the bottom end of the feed pipe, wherein the side wall of the material collecting box is hinged with a cover plate, one side of the cover plate is hinged with a connecting rod, one end of the connecting rod, which is far away from the cover plate, is hinged with a sliding block, and the sliding block is connected with the side wall of the material collecting box in a sliding manner along the vertical direction; a first spring is fixed at the top end of the sliding block, a first connecting sheet is fixed on one side of the material collecting box, which is far away from the exhaust pump, and the top end of the first spring is fixedly connected with the bottom surface of the first connecting sheet; the side wall of the material collecting box is connected with a limiting piece in a sliding manner along the width direction of the material collecting box; one side of the sliding block, which is far away from the cover plate, is provided with an inserting groove for inserting the limiting sheet; the side wall of the material collecting box is provided with a release component used for releasing the limit of the sliding block. This application has the emergence that reduces the easy condition of spilling over of powder in the case that gathers materials.)

1. The utility model provides a concrete powder storage device, includes powder jar (1), is fixed in inlet pipe (11) of powder jar (1) outer peripheral face and is fixed in case (2) that gathers materials of inlet pipe (11) bottom, its characterized in that: the side wall of the material collecting box (2) is hinged with a cover plate (4), one side of the cover plate (4) is hinged with a connecting rod (41), one end, far away from the cover plate (4), of the connecting rod (41) is hinged with a sliding block (42), and the sliding block (42) is connected with the side wall of the material collecting box (2) in a sliding mode along the vertical direction; a first spring (45) is fixed at the top end of the sliding block (42), a first connecting sheet (46) is fixed on one side, away from the exhaust pump (13), of the material collecting box (2), and the top end of the first spring (45) is fixedly connected with the bottom surface of the first connecting sheet (46); the side wall of the material collecting box (2) is connected with a limiting piece (51) in a sliding manner along the width direction of the material collecting box; one side of the sliding block (42) far away from the cover plate (4) is provided with an inserting groove (52) for inserting the limiting sheet (51); the side wall of the material collecting box (2) is provided with a releasing component used for releasing the limit of the sliding block (42).

2. A concrete powder storage device as claimed in claim 1, wherein: slider (42) are close to collection workbin (2) one side and are fixed with forked tail piece (43), collection workbin (2) lateral wall has seted up dovetail (44), dovetail piece (43) are connected along vertical and collection workbin (2) slide through dovetail (44).

3. A concrete powder storage device as claimed in claim 1, wherein: one side, far away from the sliding block (42), of the limiting piece (51) is fixed with a second spring (53), one side, far away from the exhaust pump (13), of the material collecting box (2) is fixed with a second connecting piece (54), and one end, far away from the limiting piece (51), of the second spring (53) is fixedly connected with the connecting piece.

4. A concrete powder storage device as claimed in claim 1, wherein: spacing piece (51) are fixed with forked tail piece two (55) near exhaust pump (13) one side, gather workbin (2) and keep away from exhaust pump (13) one side and seted up dovetail two (56), dovetail piece two (55) are passed through dovetail two (56) and are followed apron (4) length direction and are slided with collection workbin (2) and be connected.

5. A concrete powder storage device as claimed in claim 1, wherein: a bottom plate (21) is arranged on the periphery of the powder tank (1), a plurality of return springs (22) are uniformly distributed on the top of the bottom plate (21), and the top ends of the return springs (22) are fixedly connected with the material collecting box (2); the release assembly comprises an insertion rod (57) fixed at the top of the bottom plate (21), a slot (5) used for being connected with the insertion rod (57) in an inserting mode is formed in the bottom surface of the limiting piece (51), a first chamfer (17) is formed in one side, away from the cover plate (4), of the top of the insertion rod (57), and a second chamfer (18) used for being connected with the first chamfer (17) in an abutting mode is formed in the side wall, away from one side of the cover plate (4), of the slot (5).

6. A concrete powder storage device according to claim 5, wherein: an air exhaust pump (13) is arranged on the periphery of the powder tank (1), an air outlet pipe (14) is fixed at the air outlet end of the air exhaust pump (13), a plurality of air exhaust pipes (15) are fixed on the top surface of the air outlet pipe (14), a mounting hole (16) is formed in the bottom surface of the air outlet pipe (14), and a valve plate (3) is fixed on the air outlet pipe (14) through the mounting hole (16); one side, close to the exhaust pump (13), of the valve plate (3) is provided with a first air inlet hole (31) and a second air inlet hole (32), a mounting groove (33) is formed in the valve plate (3), and the valve plate (3) is connected with a valve (34) in a sliding mode along the vertical direction through the mounting groove (33); a rack (35) is fixed at the bottom of the valve (34); the valve plate (3) is rotatably provided with a gear (37) through a mounting groove (33), and the gear (37) is meshed with the rack (35); and a rotating mechanism for driving the gear (37) to rotate is arranged between the gear (37) and the material collecting box (2).

7. A concrete powder storage device according to claim 6, wherein: the rotating mechanism comprises a transmission shaft (36) fixed on one side of a gear (37) far away from the exhaust pump (13), a supporting plate (23) is fixed on the top of the bottom plate (21), and a butting block (24) is connected to the supporting plate (23) in a sliding manner along the radial direction of the powder tank (1); one side, close to the exhaust pump (13), of the abutting block (24) is provided with a transmission groove (25) which is used for being inserted with a transmission shaft (36); a matching component for driving the transmission shaft (36) to rotate is arranged between the transmission shaft (36) and the transmission groove (25); the top of the abutting block (24) is close to one side of the material collecting box (2) and is provided with a first inclined plane (28), and the bottom of the material collecting box (2) is close to one side of the abutting block (24) and is provided with a second inclined plane (29) which is used for abutting against the first inclined plane (28).

8. A concrete powder storage device according to claim 7, wherein: the matching component comprises a plurality of spiral protrusions (26) fixed on the outer peripheral surface of the transmission shaft (36); a plurality of spiral grooves (27) are formed in the periphery of the transmission groove (25); the helical projection (26) engages the abutment block (24) via a helical groove (27).

Technical Field

The application relates to the field of concrete powder tanks, in particular to a concrete powder storage device.

Background

At present, in building construction, a storage tank is usually adopted for storing concrete powder, and the concrete powder may be coagulated in the long-term storage process.

The correlation technique can refer to the chinese utility model patent that the grant bulletin number is CN205870851U, it discloses concrete powder storage device, including the accumulator tank body, the top of the accumulator tank body is equipped with the feed inlet, be equipped with the discharge opening on the lateral wall of bottom, all be equipped with the valve on feed inlet and the discharge opening, the bottom of the accumulator tank body is equipped with the gas distribution dish, the upper surface of gas distribution dish is equipped with a plurality of outlet ducts, all be equipped with the check valve in every outlet duct, the gas distribution dish passes through the intake pipe and is connected with the air-blower, the top of the accumulator tank body still is equipped with the blast pipe, the collection room is connected to the blast pipe, the outside of the accumulator tank body still is equipped with heat sink, heat sink is the spiral pipe of winding in the accumulator tank body outside, the bottom of spiral pipe is equipped with the water inlet, the top is equipped with the delivery port.

With respect to the related art in the above, the inventors consider that there are the following drawbacks: because the case that gathers materials is mostly non-transparent material and makes, when the powder material was too much in the case that gathers materials, can't in time discover the powder state in the case that gathers materials to lead to the condition that the powder material spilled over in the case that gathers materials.

Disclosure of Invention

In order to improve the problem that the powder spills over easily in the case that gathers materials, this application provides a concrete powder storage device.

The application provides a concrete powder storage device adopts following technical scheme:

a concrete powder storage device comprises a powder tank, a feeding pipe fixed on the peripheral surface of the powder tank and a material collecting box fixed at the bottom end of the feeding pipe, wherein a cover plate is hinged to the side wall of the material collecting box, a connecting rod is hinged to one side of the cover plate, a sliding block is hinged to one end, away from the cover plate, of the connecting rod, and the sliding block is connected with the side wall of the material collecting box in a sliding mode along the vertical direction; a first spring is fixed at the top end of the sliding block, a first connecting sheet is fixed on one side of the material collecting box, which is far away from the exhaust pump, and the top end of the first spring is fixedly connected with the bottom surface of the first connecting sheet; the side wall of the material collecting box is connected with a limiting piece in a sliding manner along the width direction of the material collecting box; one side of the sliding block, which is far away from the cover plate, is provided with an inserting groove for inserting the limiting sheet; the side wall of the material collecting box is provided with a releasing assembly used for releasing the limit of the sliding block.

Through adopting above-mentioned technical scheme, spring one provides the elasticity of lapse for the slider, removes the spacing back to the slider when the release subassembly to make the apron open to remind the staff to gather the dust in the workbin to be full, reduce the possibility that powder overfull spills in the workbin.

Optionally, one side, close to the material collecting box, of the sliding block is fixed with a dovetail block I, the side wall of the material collecting box is provided with a dovetail groove I, and the dovetail block I is connected with the material collecting box in a sliding mode along the vertical direction through the dovetail groove I.

By adopting the technical scheme, the first dovetail groove provides a guiding effect for the first dovetail block to move vertically, and the possibility that the sliding block deviates from a track in the vertical moving process is reduced.

Optionally, a second spring is fixed on one side, away from the sliding block, of the limiting piece, a second connecting piece is fixed on one side, away from the exhaust pump, of the material collecting box, and one end, away from the limiting piece, of the second spring is fixedly connected with the connecting piece.

Through adopting above-mentioned technical scheme, spring two provides the elasticity to being close to apron one side for spacing piece to make spacing piece provide limiting displacement for the slider.

Optionally, one side of the limiting piece close to the exhaust pump is fixed with a dovetail block II, one side of the collection box far away from the exhaust pump is provided with a dovetail groove II, and the dovetail block II is connected with the collection box in a sliding mode along the length direction of the cover plate through the dovetail groove II.

Through adopting above-mentioned technical scheme, dovetail two provides the guide effect along apron length direction for dovetail block two to the restriction spacing piece only moves along apron length direction.

Optionally, a bottom plate is arranged on the periphery of the powder tank, a plurality of return springs are uniformly distributed on the top of the bottom plate, and the top ends of the return springs are fixedly connected with the material collecting box; the release assembly comprises an insertion rod fixed at the top of the bottom plate, a slot used for being connected with the insertion rod in an inserting mode is formed in the bottom surface of the limiting piece, a first chamfer is formed in one side, away from the cover plate, of the top of the insertion rod, and a second chamfer used for being connected with the first chamfer in an abutting mode is formed in the side wall, away from one side of the cover plate, of the slot.

Through adopting above-mentioned technical scheme, reset spring is used for providing the elasticity that upwards resets for the case that gathers materials, and when the dust weight in the case that gathers materials surpassed reset spring's elasticity, the case that gathers materials descends gradually to make the inserted bar peg graft with the slot on the spacing piece, the inserted bar supports through chamfer one and presses spacing piece, and promotes spacing piece and slider separation.

Optionally, an air exhaust pump is arranged on the periphery of the powder tank, an air outlet pipe is fixed at the air outlet end of the air exhaust pump, a plurality of air exhaust pipes are fixed on the top surface of the air outlet pipe, mounting holes are formed in the bottom surface of the air outlet pipe, and a valve plate is fixed on the air outlet pipe through the mounting holes; one side, close to the exhaust pump, of the valve plate is provided with a first air inlet hole and a second air inlet hole, a mounting groove is formed in the valve plate, and the valve plate is connected with a valve in a sliding mode along the vertical direction through the mounting groove; a rack is fixed at the bottom of the valve; the valve plate is rotatably provided with a gear through a mounting groove, and the gear is meshed with the rack; and a rotating mechanism for driving the gear to rotate is arranged between the gear and the material collecting box.

Through adopting above-mentioned technical scheme, the air exhaust pump is used for providing the air current of upwards flowing for the powder, and the powder of being convenient for gets into in the inlet tube. When dust overflows in the collection box, the air flow provided by the air exhaust pump needs to be reduced, so that the upward floating height of the powder is reduced, and by arranging the movable valve, the air flow can be reduced after the valve moves upwards, so that the aim of controlling the air flow is fulfilled.

Optionally, the rotating mechanism includes a transmission shaft fixed on one side of the gear far from the exhaust pump, a supporting plate is fixed on the top of the bottom plate, and a butting block is connected to the supporting plate in a sliding manner along the radial direction of the powder tank; a transmission groove used for being spliced with the transmission shaft is formed in one side, close to the exhaust pump, of the abutting block; a matching assembly for driving the transmission shaft to rotate is arranged between the transmission shaft and the transmission groove; the supporting and connecting piece is characterized in that one side, close to the material collecting box, of the top of the supporting and connecting piece is provided with a first inclined plane, and one side, close to the supporting and connecting piece, of the bottom of the material collecting box is provided with a second inclined plane which is used for being abutted to the first inclined plane.

Through adopting above-mentioned technical scheme, the case that gathers materials receives the action of gravity after removing downwards, and the case that gathers materials removes through promoting the butt piece, and the butt piece passes through cooperation subassembly drive transmission shaft and rotates to realize the gear and rotate, and drive the valve through the gear and go up and down, reach the purpose of control air flow.

Optionally, the fitting assembly includes a plurality of spiral protrusions fixed to an outer circumferential surface of the transmission shaft; a plurality of spiral grooves are formed in the periphery of the transmission groove; the helical protrusion is engaged with the abutment block through the helical groove.

Through adopting above-mentioned technical scheme, when the butt piece supported the pressure transmission shaft, the butt piece passed through the heliciform recess and applyed turning moment to the heliciform arch to drive the transmission shaft and rotate, and then drive gear revolve.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the first spring provides downward moving elastic force for the sliding block, and when the limiting of the releasing assembly on the sliding block is relieved, the first spring pushes the sliding block to move downward, so that the cover plate is opened to remind workers that the material collecting box is full of dust, and the possibility of overflowing of the powder in the material collecting box due to overfilling is reduced;

2. the reset spring is used for providing upward reset elastic force for the material collecting box, and when the weight of dust in the material collecting box exceeds the elastic force of the reset spring, the material collecting box gradually descends, so that the inserted bar is inserted into the slot on the limiting piece, the inserted bar presses the limiting piece through the chamfer one, and the limiting piece is pushed to be separated from the sliding block;

3. the air exhaust pump is used for providing upward flowing air flow for the powder, so that the powder can conveniently enter the feeding pipe. When dust overflows in the collection box, the air flow provided by the air exhaust pump needs to be reduced, so that the upward floating height of the powder is reduced, and by arranging the movable valve, the air flow can be reduced after the valve moves upwards, so that the aim of controlling the air flow is fulfilled.

Drawings

FIG. 1 is a schematic structural view of a concrete powder storage device according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view of an air outlet pipe according to an embodiment of the present application.

FIG. 4 is a schematic structural diagram of a material collecting box according to an embodiment of the present application.

Fig. 5 is an enlarged schematic view taken along B in fig. 4.

FIG. 6 is a schematic structural diagram of a material collecting box according to an embodiment of the present application.

Fig. 7 is an enlarged schematic view taken along C in fig. 6.

Reference numerals: 1. a powder tank; 11. a feed pipe; 12. a partition plate; 13. an exhaust pump; 14. an air outlet pipe; 15. an exhaust duct; 16. mounting holes; 17. chamfering I; 18. chamfering II; 2. a material collecting box; 21. a base plate; 22. a return spring; 23. a supporting plate; 24. a butting block; 25. a transmission groove; 26. a helical protrusion; 27. a helical groove; 28. a first inclined plane; 29. a second inclined plane; 3. a valve plate; 31. an air inlet hole I; 32. a second air inlet hole; 33. mounting grooves; 34. a valve; 35. a rack; 36. a drive shaft; 37. a gear; 4. a cover plate; 41. a connecting rod; 42. a slider; 43. a dovetail block I; 44. a first dovetail groove; 45. a first spring; 46. connecting a first sheet; 5. a slot; 51. a limiting sheet; 52. inserting grooves; 53. a second spring; 54. a second connecting sheet; 55. a dovetail block II; 56. a second dovetail groove; 57. and (4) inserting the rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses concrete powder storage device. Referring to fig. 1 and 2, a concrete powder storage device includes a powder tank 1, a feed pipe 11 fixed to an outer circumferential surface of the powder tank 1, and a hopper 2 fixed to a bottom end of the feed pipe 11. A partition plate 12 is fixed to the inner peripheral surface of the powder tank 1, and the partition plate 12 divides the space in the powder tank 1 into a blanking area at the upper layer and an equipment area at the lower layer. An air exhaust pump 13 is arranged on the periphery of the powder tank 1, an air outlet pipe 14 is fixed at the air outlet end of the air exhaust pump 13, and the air outlet pipe 14 penetrates through the side wall of the powder tank 1 and is arranged in an equipment area below the partition plate 12. The top surface of the air outlet pipe 14 is uniformly provided with a plurality of exhaust pipes 15 along the length direction of the air outlet pipe 14, and in the embodiment, the number of the exhaust pipes 15 is 5. The air flow generated by the air exhaust pump 13 flows into the powder tank 1 through the air outlet pipe 14 and is sprayed into the powder tank 1 through the air exhaust pipe 15; because the concrete powder in the powder tank 1 can be coagulated under the condition of long-term standing, the condition that the concrete powder stays for a long time is reduced by continuously spraying upward air flow at the bottom of the powder tank 1; meanwhile, the air flow in the air outlet pipe 14 can drive the powder to continuously rise and enter the feeding pipe 11.

Referring to fig. 2 and 3, a mounting hole 16 is formed in the bottom surface of the air outlet pipe 14, and the valve plate 3 is fixed to the air outlet pipe 14 through the mounting hole 16. One side of the valve plate 3 close to the exhaust pump 13 is provided with a first air inlet hole 31 and a second air inlet hole 32, and the first air inlet hole 31 is positioned above the second air inlet hole 32; when the first air inlet hole 31 and the second air inlet hole 32 are both in an open state, the air flow strength is high, and the air flow can drive concrete powder to enter the blanking pipe; when the air inlet is closed, the strength of the air flow is reduced, and the rising height of the concrete powder is reduced. The valve plate 3 is internally provided with a mounting groove 33 which is respectively communicated with the first air inlet hole 31 and the second air inlet hole 32 along the vertical direction, and the valve plate 3 is connected with a valve 34 through the mounting groove 33 along the vertical direction in a sliding manner. The bottom of the valve 34 is fixed with a rack 35. The valve plate 3 is rotatably provided with a gear 37 through the mounting groove 33, and the gear 37 is engaged with the rack 35. A transmission shaft 36 is fixed on one side of the gear 37 far away from the exhaust pump 13; the gear 37 rotates to drive the rack 35 to ascend, thereby closing the second air inlet hole 32 through the valve 34.

Referring to fig. 2 and 4, a bottom plate 21 is disposed around the powder tank 1, and a plurality of return springs 22 are uniformly distributed on the top of the bottom plate 21, wherein in the present embodiment, the number of the return springs 22 is 9. The top end of the return spring 22 is fixedly connected with the material collecting box 2; when the concrete powder in the material collecting box 2 gradually increases, the material collecting box 2 moves downwards under the action of gradually increasing gravity; the return spring 22 provides upward elastic force to the material collecting box 2, so that the material collecting box 2 is conveniently reset upwards. The top of the bottom plate 21 is fixed with a supporting plate 23, and the supporting plate 23 is connected with a butting block 24 along the radial direction of the powder tank 1 in a sliding manner. One side of the abutting block 24 close to the exhaust pump 13 is provided with a transmission groove 25 for being inserted with the transmission shaft 36.

Referring to fig. 4 and 5, a plurality of spiral protrusions 26 are uniformly distributed on the outer circumferential surface of the transmission shaft 36 along the circumferential direction thereof, and a plurality of spiral grooves 27 are uniformly distributed on the circumferential side of the transmission groove 25 along the circumferential direction thereof; the helical projection 26 engages the abutment block 24 via the helical groove 27. The top of the abutting block 24 is provided with a first inclined plane 28 close to one side of the material collecting box 2, and the bottom of the material collecting box 2 is provided with a second inclined plane 29 close to one side of the abutting block 24 and used for abutting against the first inclined plane 28. After the material collecting box 2 moves downwards, the second inclined surface 29 of the abutting block 24 is pressed by the first inclined surface 28, so that the transmission shaft 36 is pushed to move towards the side close to the exhaust pump 13.

Referring to fig. 6 and 7, the side wall of the material collecting box 2 is hinged with a cover plate 4, and in this embodiment, the cover plate 4 is positioned on the side of the material collecting box 2 far away from the air exhaust pump 13. One side of the cover plate 4 is hinged with a connecting rod 41, one end, far away from the cover plate 4, of the connecting rod 41 is hinged with a sliding block 42, and the sliding block 42 is connected with the side wall of the material collecting box 2 in a sliding mode along the vertical direction. A dovetail block I43 is fixed on one side, close to the material collecting box 2, of the sliding block 42, a dovetail groove I44 is formed in the side wall of the material collecting box 2, and the dovetail block I43 is connected with the material collecting box 2 in a sliding mode along the vertical direction through the dovetail groove I44; the dovetail groove one 44 provides a vertical guiding function for the dovetail block one 43. A first spring 45 is fixed at the top end of the sliding block 42, a first connecting sheet 46 is fixed on one side of the material collecting box 2 away from the air exhaust pump 13, and the top end of the first spring 45 is fixedly connected with the bottom surface of the first connecting sheet 46; the first spring 45 provides a spring action of downward return for the slider 42.

Referring to fig. 6 and 7, the side wall of the material collecting box 2 is connected with a limiting piece 51 in a sliding manner along the width direction thereof. The side wall of the slider 42 away from the cover plate 4 is provided with an insertion groove 52 for inserting the limiting sheet 51. A second spring 53 is fixed on one side of the limiting piece 51, which is far away from the sliding block 42, a second connecting piece 54 is fixed on one side of the material collecting box 2, which is far away from the air exhaust pump 13, and one end of the second spring 53, which is far away from the limiting piece 51, is fixedly connected with the connecting piece; the second spring 53 provides an elastic force for the limiting sheet 51 to return to the side close to the slide block 42. A dovetail block II 55 is fixed on one side of the limiting piece 51 close to the exhaust pump 13, a dovetail groove II 56 is formed in one side of the material collecting box 2 far away from the exhaust pump 13, and the dovetail block II 55 is connected with the material collecting box 2 in a sliding mode along the length direction of the cover plate 4 through the dovetail groove II 56; the second dovetail groove 56 provides a guide function for the second dovetail block 55 to move in the width direction of the material collecting box 2.

Referring to fig. 6 and 7, an insertion rod 57 is fixed at the top of the bottom plate 21, a slot 5 for being inserted into the insertion rod 57 is formed in the bottom surface of the limiting piece 51, a first chamfer 17 is formed on one side, away from the cover plate 4, of the top of the insertion rod 57, and a second chamfer 18 for being abutted to the first chamfer 17 is formed on the side wall, away from the cover plate 4, of the slot 5.

The implementation principle of the concrete powder storage device in the embodiment of the application is as follows:

concrete powder enters the feeding pipe 11 from the powder tank 1 under the action of ascending air flow and enters the material collecting box 2 from the feeding pipe 11. When the concrete powder in the material collecting box 2 is gradually increased, the self weight of the concrete powder drives the material collecting box 2 to gradually move downwards and contact with the abutting block 24; the material collecting box 2 pushes the abutting block 24 to move to the side close to the exhaust pump 13 through the first inclined plane 28.

In the moving process of the abutting block 24, the abutting block 24 applies force pressure along the axial direction of the transmission shaft 36 to the spiral protrusion 26 through the spiral groove 27, so that a rotating torque is applied to the transmission shaft 36, the transmission shaft 36 is driven to rotate, and the transmission shaft 36 is meshed with the rack 35 through the gear 37 to drive the rack 35 to move upwards; the second air inlet hole 32 is covered in the upward movement process of the valve 34, so that the flow in the air outlet pipe 14 is reduced, and the rising height of the concrete powder is reduced.

In the descending process of the material collecting box 2, the inserted rod 57 presses the limiting piece 51 through the second chamfer 18 and pushes the limiting piece 51 to move towards the side far away from the sliding block 42, so that the limiting effect of the limiting piece 51 on the sliding block 42 is relieved. The slide block 42 moves downwards under the action of the first spring 45 and pushes the cover plate 4 to turn downwards through the connecting rod 41. Can indicate the staff to carry out the ejection of compact to the concrete dust in the case 2 that gathers materials through the automatic upset of apron 4.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.