CN215484728U - Pumping system of modified concrete pump truck - Google Patents

Abstract

The utility model provides a pumping system of a modified concrete pump truck, which comprises a hopper, wherein a storage tank is arranged on the hopper, the storage tank comprises four corners, four guide pieces are respectively arranged at the four corners of the storage tank, each guide piece comprises a first surface, a second surface and a third surface, the first surface is vertical to the second surface, the first surface and the second surface are respectively attached to the inner wall of the storage tank, the upper end and the left end and the right end of the third surface are respectively connected with the first surface and the second surface, the lower end of the third surface is connected with the bottom of the storage tank, the glasses plate is arranged on one side surface of the storage tank, two through holes are arranged on the glasses plate, the pumping mechanism penetrates through the hopper to be connected with the glasses plate, and is communicated with the two through holes, the S valve assembly is rotatably arranged in the hopper through the swing mechanism, one end of the S valve assembly is respectively communicated with the two through holes of the glasses plate through rotation, and the conveying pipeline is communicated with the other end of the S valve assembly. Through the technical scheme, the problems of material piling and difficulty in cleaning in the hopper are solved.

Description

Pumping system of modified concrete pump truck

Technical Field

The utility model relates to a concrete pump truck part, in particular to a pumping system of a modified concrete pump truck.

Background

The concrete pump truck is a machine for continuously conveying concrete along a pipeline by using pressure, and mainly comprises a chassis, an arm frame system, a turret, a pumping system, a hydraulic system and an electric system. The pumping system is a main conveying part and mainly comprises a hopper, a pumping mechanism, an S valve assembly, a swing mechanism, a stirring mechanism, a conveying pipeline and a lubricating system, wherein in the operation process, the pumping mechanism, the swing mechanism and the S valve assembly are matched to continuously convey concrete in the hopper to a pouring site along the conveying pipeline.

Present widely used concrete pump truck is mostly C valve switching-over mode pump truck, and this kind of pump truck advantage is: the maintenance is convenient, and the material beating is fast; the disadvantages are that: high maintenance cost, more expensive wearing parts, material picking and unsuitability for high-grade concrete pumping. Through the use for many years, gaps of all parts are changed, and in addition, the condition that concrete is poor in workability and difficult to pump generally exists in the concrete on the market at present, the C valve reversing mode pump truck cannot meet the concrete pumping requirement, so that the concrete pump truck of the S valve pump appears. Compared with the prior art, the concrete pump truck with the S valve pump can greatly compensate the defects of the C valve pump in use, the fitting price is lower than that of the C valve pump, the maximum advantage is that the materials are not selected, and high-grade concrete pumping can be carried out. Therefore, the existing C valve pump truck is more transformed into a concrete pump truck with an S valve pump. However, the modified S-valve pump truck widely used at present generally has the problems of material piling in the hopper, difficulty in cleaning, easy damage to the sealing part of the stirring shaft, short service life and the like which need to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a pumping system of a modified concrete pump truck, which aims to solve the problems of material piling and difficult cleaning in a hopper.

In order to solve the technical problems, the utility model adopts the technical scheme that:

a pumping system of a modified concrete pump truck comprising:

the storage bin is arranged on the hopper and comprises four corners;

the four guide pieces are respectively arranged at four corners of the stock chest, each guide piece comprises a first surface, a second surface and a third surface, the first surface is perpendicular to the second surface, the first surface and the second surface are respectively attached to the inner wall of the stock chest, the upper end and the left end and the right end of the third surface are respectively connected with the first surface and the second surface, and the lower end of the third surface is connected with the bottom of the stock chest;

the glasses plate is arranged on one side surface of the storage tank and is provided with two through holes;

the pumping mechanism penetrates through the hopper to be connected with the glasses plate and is communicated with the two through holes;

the swinging mechanism is arranged outside the hopper;

the S valve assembly is rotatably arranged in the hopper through the swing mechanism, and one end of the S valve assembly is respectively communicated with the two through holes of the glasses plate through rotation;

and the conveying pipeline is arranged on the other side surface of the hopper and communicated with the other end of the S valve assembly.

As a further technical solution, the method further comprises:

rabbling mechanism, rabbling mechanism rotates to set up in the stock chest, the rabbling mechanism includes:

the two ends of the stirring shaft are rotatably arranged on the hopper;

the stirring pieces are arranged in the storage tanks, are respectively positioned at two ends of the stirring shaft and rotate along with the stirring shaft;

and the power device is arranged at one end of the stirring shaft and rotates.

As a further technical solution, the stirring member includes:

the connecting part is sleeved on the stirring shaft;

a plurality of stirring rods which are arranged on the connecting part in a surrounding manner;

the stirring heads correspond to the stirring rods one by one and are respectively arranged at one ends of the stirring rods far away from the connecting part, and the stirring heads are arc-shaped plates;

the reinforcing plates are arranged on two side faces of the stirring rod respectively.

As a further technical scheme, still include sealing device, the both ends of (mixing) shaft are respectively through sealing device rotates the setting on the hopper, sealing device includes:

the bearing seat is provided with an inner hole for the stirring shaft to pass through, a first groove is formed in one end face of the bearing seat, a second groove is formed in the other end face of the bearing seat, and a third groove is formed in the bottom of the second groove;

a ball bearing disposed within the first groove;

the dustproof rubber mat is arranged in the second groove;

a first oil seal disposed within the third recess;

the bearing gland is arranged on the bearing seat and used for fixing the ball bearing, and a fourth groove is formed in the side face, close to the ball bearing, of the bearing gland;

a second oil seal disposed within the fourth recess.

As a further technical scheme, the bearing seat and the bearing gland are cylindrical, and a plurality of fixing holes are formed in the edges of the bearing seat and the bearing gland in a surrounding mode.

As a further technical solution, the method further comprises:

the screen assembly is arranged at the opening of the hopper, and one end of the screen assembly is rotatably arranged on the hopper.

As a further aspect, the screen assembly comprises:

one end of the first screen is rotatably arranged on the hopper;

a second screen disposed on a lower surface of the first screen;

and the transmission device drives the second screen to slide to and fro below the first screen.

As a further technical solution, the transmission comprises:

the two mounting frames are arranged on the lower surface of the first screen and located at two ends of the first screen, the second screen is arranged between the first screen and the mounting frames, two strip-shaped holes are correspondingly formed in the edges of two sides of the second screen along the length direction of the second screen, two ends of each mounting frame penetrate through the two strip-shaped holes respectively and are arranged on the first screen, and first transmission teeth are arranged on two side walls of each strip-shaped hole along the length direction;

the four rotating wheels are respectively rotatably arranged at the end parts of the two mounting frames and are positioned in the strip-shaped holes, a plurality of second transmission teeth are arranged on the arc surface of each rotating wheel in a surrounding manner, the arc length of each second transmission tooth is smaller than or equal to half of the circumference of each rotating wheel, and the second transmission teeth are respectively meshed with the first transmission teeth on the two side walls of the strip-shaped holes.

The utility model has the beneficial effects that:

the hopper is simple in structure, and the guide pieces are arranged at the four corners of the hopper, so that the problem of dead angles caused by accumulation is effectively avoided, and the problems that the hopper is piled and is not easy to clean are effectively solved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic cross-sectional view of a hopper according to the present invention;

FIG. 3 is a schematic perspective view of the sealing device of the present invention;

FIG. 4 is a schematic cross-sectional view of a sealing device according to the present invention;

FIG. 5 is a schematic perspective view of a screen assembly according to the present invention;

fig. 6 is a schematic structural diagram of the rocking mechanism of the present invention.

Description of the reference numerals

1. Hopper, 100, stock chest, 2, guide, 21, third face, 3, glasses board, 4, pumping mechanism, 5, rocking mechanism, 51, rotation axis, 52, rocker arm, 53, ball bowl, 54, gasket, 55, swing cylinder, 56, mounting hole, 6, S valve assembly, 7, stirring mechanism, 71, stirring shaft, 72, stirring piece, 721, connecting part, 722, stirring rod, 723, stirring head, 724, reinforcing plate, 73, power device, 8, sealing device, 81, bearing seat, 82, ball bearing, 83, dustproof rubber pad, 84, first oil seal, 85, bearing cover, 86, second oil seal, 87, fixing hole, 9, screen assembly, 91, first screen, 92, second screen, 93, transmission device, 931, mounting bracket 932, strip-shaped hole, 933, first transmission tooth, 934, rotation wheel, 935, second tooth, 10, conveying pipeline.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As shown in fig. 1-6, the utility model provides a pumping system of a modified concrete pump truck, which comprises a hopper 1, a guide member 2, a wear plate 3, a pumping mechanism 4, a swing mechanism 5, an S-valve assembly 6, a conveying pipeline 10, a stirring mechanism 7, a sealing device 8 and a screen assembly 9.

The storage bin 1 is provided with a storage bin 100, the storage bin 100 comprises four corners, four guide pieces 2 are respectively arranged at the four corners of the storage bin 100, each guide piece 2 comprises a first surface, a second surface and a third surface 21, the first surface is perpendicular to the second surface, the first surface and the second surface are respectively attached to the inner wall of the storage bin 100, the upper end, the left end and the right end of the third surface 21 are respectively connected with the first surface and the second surface, the lower end of the third surface 21 is connected with the bottom of the storage bin 100, a glasses plate 3 is arranged on one side surface of the storage bin 100, two through holes are arranged on the glasses plate 3, a pumping mechanism 4 penetrates through the hopper 1 to be connected with the glasses plate 3 and is communicated with the two through holes, the pumping mechanism 4 comprises two main oil cylinders, a water tank, a reversing device, two concrete pistons and two concrete cylinders, the structure of the pumping mechanism is the same as that in the prior art, no description is given here, a swing mechanism 5 is arranged outside the hopper 1, the S valve assembly 6 is rotatably arranged in the hopper 1 through the swing mechanism 5, one end of the S valve assembly is respectively communicated with the two through holes of the glasses plate 3 through rotation, and the conveying pipeline 10 is arranged on the other side surface of the hopper 1 and is communicated with the other end of the S valve assembly 6.

The swing mechanism 5 comprises a rotating shaft 51, rocker arms 52, ball bowls 53, gaskets 54, swing cylinders 55, the rotating shaft 51 is rotatably arranged on the side wall of the hopper 1 in a penetrating mode, one end of the rotating shaft drives the S valve assembly 6 to rotate, the rocker arms 52 are arranged on the outer side of the hopper 1, one end of each rocker arm is arranged at the other end of the corresponding rotating shaft 51 to drive the corresponding rotating shaft 51 to rotate, mounting holes 56 are formed in two side walls of the other end of each rocker arm 52, the ball bowls 53 are arranged in the two mounting holes 56 respectively, the gaskets 54 are arranged in the two mounting holes 54 and arranged between the bottoms of the mounting holes 56 and the bottoms of the ball bowls 53 respectively, the swing cylinders 55 are arranged in the two ball bowls 53 respectively in a rotating mode through ball pins, and cylinder bodies of the swing cylinders 55 are rotatably arranged on the hopper 1.

The stirring mechanism 7 is rotatably arranged in the storage tank 100, the stirring mechanism 7 comprises a stirring shaft 71, stirring pieces 72 and a power device 73, two ends of the stirring shaft 71 are rotatably arranged on the hopper 1, the stirring pieces 72 are two stirring pieces arranged in the storage tank 100 and respectively located at two ends of the stirring shaft 71 and rotate along with the stirring shaft 71, each stirring piece 72 comprises a connecting portion 721, a plurality of stirring rods 722, a stirring head 723 and a reinforcing plate 724, the connecting portion 721 is sleeved on the stirring shaft 71, the plurality of stirring rods 722 are arranged on the connecting portion 721 in a surrounding manner, the stirring heads 723 and the plurality of stirring rods 722 are in one-to-one correspondence and respectively arranged at one ends of the stirring rods 722 far away from the connecting portion 721, the stirring heads 723 are arc-shaped plates, the plurality of reinforcing plates 724 are respectively arranged on two side faces of the stirring rods 722, and one end of the power device 73 is arranged at one end of the stirring shaft 71 and drives the power device to rotate. The two ends of the stirring shaft 71 are respectively rotatably arranged on the hopper 1 through the sealing device 8, the sealing device 8 comprises a bearing seat 81, a ball bearing 82, a dustproof rubber gasket 83, a first oil seal 84, a bearing gland 85 and a second oil seal 86, an inner hole for the stirring shaft 71 to pass through is arranged on the bearing seat 81, a first groove is arranged on one end surface of the bearing seat 81, a second groove is arranged on the other end surface of the bearing seat 81, a third groove is arranged at the bottom of the second groove, the ball bearing 82 is arranged in the first groove, the dustproof rubber gasket 83 is arranged in the second groove, the first oil seal 84 is arranged in the third groove, the bearing gland 85 is arranged on the bearing seat 81, the ball bearing 82 is fixed, a fourth groove is arranged on the side surface of the bearing gland 85 close to the ball bearing 82, a second oil seal 86 is arranged in the fourth groove, the bearing seat 81 and the bearing gland 85 are both cylindrical, and the edge of the bearing seat 81 and the edge of the bearing cover 85 are provided with a plurality of fixing holes 87 around each.

The screen assembly 9 is arranged at an opening of the hopper 1, one end of the screen assembly is rotatably arranged on the hopper 1, the screen assembly 9 comprises a first screen 91, a second screen 92 and a transmission device 93, one end of the first screen 91 is rotatably arranged on the hopper 1, the second screen 92 is arranged on the lower surface of the first screen 91, the transmission device 93 drives the second screen 92 to slide under the first screen 91 in a reciprocating manner, the transmission device 93 comprises a mounting frame 931 and a rotating wheel 934, the two mounting frames 931 are arranged on the lower surface of the first screen 91 and are positioned at two ends of the first screen 91, the second screen 92 is arranged between the first screen 91 and the mounting frame 931, two strip-shaped holes 932 are correspondingly arranged at two side edges of the second screen 92 along the length direction, two ends of each mounting frame 931 are arranged on the first screen 91 through the two strip-shaped holes 932 respectively, first transmission teeth 933 are arranged on two side walls of each strip-shaped hole 932 along the length direction, the rotation wheel 934 is four, rotates the tip that sets up at two mounting brackets 931 respectively, and is located bar hole 932, rotates on the cambered surface of wheel 934 around being provided with a plurality of second driving teeth 935, and a plurality of second driving teeth 935 around the arc length less than or equal to the half of rotation wheel 934 girth that forms, and second driving teeth 935 meshes with first driving teeth 933 on the both sides wall of bar hole 932 respectively. The one end that first screen cloth 91 kept away from its and the pivot between the hopper 1 is provided with the supporting part, and the both ends setting of supporting part is on two mounting brackets 931, and the bottom surface of supporting part is used for supporting the edge at the upper surface of hopper 1, and the inside two small-size motors that are provided with of supporting part, two small-size motors are connected with two rotation wheels 934 of this side respectively, drive rotation wheel 934 and rotate.

In the embodiment, in the pumping process, under the action of the main oil cylinder, one concrete piston moves forward, the other concrete piston moves backward, at the moment, the concrete cylinder connected with the main oil cylinder with the backward concrete piston is communicated with the hopper 1 through the through hole of the wear plate 3, and simultaneously, under the action of the swing oil cylinder, the concrete cylinder connected with the main oil cylinder with the forward concrete piston is communicated with one end of the S valve assembly 6, so that the backward concrete piston is realized, the concrete in the hopper 1 is sucked into the concrete cylinder, the concrete piston moves forward, and the concrete in the concrete cylinder is sent into the S valve assembly 6 and pumped out. When the concrete piston retreats to the stroke end, the reversing device in the water tank is triggered, the main oil cylinder reverses, the swing oil cylinder reverses simultaneously, the S valve assembly 6 is communicated with the other concrete cylinder, the first concrete cylinder is communicated with the hopper 1, and at the moment, the piston retreats, advances and circulates in sequence, so that continuous pumping is realized.

The guide pieces 2 are arranged at the four corners of the storage tank 100, so that dead corners can be filled, the angle can be increased, the phenomenon that stacking occurs at the dead corners due to the fact that concrete materials are clamped is avoided, cleaning is facilitated, and the practicability is high. The third surface 21 may be a plane or a curved surface which is obliquely arranged, so that the concrete material can slide down and break away.

The setting of agitating unit is favorable to stirring the concrete in the hopper 1, avoids the adhesion, the pumping of being convenient for. The specific operation steps are as follows: the power device 73 drives the stirring shaft 71 to rotate, and the stirring shaft 71 drives the stirring piece 72 to rotate. The connecting part 721 is arranged, so that the stirring piece 72 can be detachably arranged on the stirring shaft 71 through the connecting part 721, and the cleaning and the replacement are convenient; the reinforcement plate 724 facilitates increasing the strength of the stirring rod 722 and extending the service life of the stirring element 72. The stirring head 723 is an arc-shaped plate, which is beneficial to enhancing the stirring effect. The setting of first recess, second recess, third recess and fourth recess is convenient for set up the installation of oil blanket and dustproof cushion 83, the setting of first oil blanket 84, second oil blanket 86 and dustproof cushion 83 and with the mounting means of bearing frame 81, the processing of being convenient for, when guaranteeing sealed effect, be favorable to reducing substantially the spoilage of (mixing) shaft 71 sealing member, increase of service life reduces cost of maintenance again, also increase economic benefits simultaneously, and the practicality is strong. The arrangement of the fixing hole 87 is beneficial to installing the whole sealing device 8 on the outer wall of the hopper 1, and the operation is convenient and the reliability is strong.

The swing mechanism 5 realizes the rotation of the rocker arm 52 by the mutual matching extension and retraction of the telescopic rods of the two swing cylinders 55, so that the rocker arm 52 drives the S-valve assembly 6 to rotate. The ball bowl 53 retains the ball pin for free rotation therein, thereby providing a pivotal connection between the tilt cylinder 55 and the rocker arm 52. The gasket 54 arranged between the bottom of the mounting hole 56 and the bottom of the ball bowl 53 is beneficial to compensating the length loss of the S valve reformed from the C valve, so that the cutting ring corresponds to the position of the glasses plate 3, smooth output in concrete work is ensured to be free from obstruction, the condition of abrasion of the cutting ring is effectively avoided, the maintenance cost is reduced, meanwhile, the abrasion of the bottom of the ball valve is also beneficial to avoiding, the replacement is convenient, and the service life is prolonged.

Screen assembly 9 is provided with and does benefit to and carries out preliminary screening to the concrete, avoids the adhesion. The specific operation steps are as follows: the small-size motor drives and rotates wheel 934 and rotates, the cooperation of second driving tooth 935 on the wheel 934 and the first driving tooth 933 on one of them lateral wall of bar hole 932, drive second screen cloth 92 and remove to a direction, when rotating wheel 934 and rotating second driving tooth 935 to it and the cooperation of first driving tooth 933 on another lateral wall of bar hole 932, drive second screen cloth 92 and remove to the opposite direction, it is reciprocal along with the rotation circulation of wheel 934, realize second screen cloth 92 in the swing of first screen cloth 91 below, thereby the effect of preliminary screening is strengthened. The provision of the mounting frame 931 facilitates locating the second screen 92 below the first screen 91 and also facilitates the mounting of the rotatable wheel 934. The supporting part is favorable to making the firm placing of screen cloth subassembly 9 in hopper 1 top, and the reinforcing reliability also provides the space for small-size motor's setting simultaneously. One end of the first screen 91 is rotatably arranged on the hopper 1, so that the parts inside the hopper 1 can be conveniently overhauled and replaced, and the screen assembly 9 can also be detached from the hopper 1, so that the replacement and the cleaning are convenient.

The foregoing description is only of the preferred embodiments of the present invention, and it should be understood that the described embodiments are only a few, and not all, of the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (8)

1. A pumping system of a modified concrete pump truck, comprising:

the material storage device comprises a hopper (1), wherein a material storage tank (100) is arranged on the hopper (1), and the material storage tank (100) comprises four corners;

the four guide pieces (2) are respectively arranged at four corners of the stock chest (100), each guide piece (2) comprises a first surface, a second surface and a third surface (21), the first surface is perpendicular to the second surface, the first surface and the second surface are respectively attached to the inner wall of the stock chest (100), the upper end and the left end and the right end of the third surface (21) are respectively connected with the first surface and the second surface, and the lower end of the third surface (21) is connected with the bottom of the stock chest (100);

the glasses plate (3) is arranged on one side surface of the storage tank (100), and two through holes are formed in the glasses plate (3);

the pumping mechanism (4) penetrates through the hopper (1) to be connected with the glasses plate (3) and is communicated with the two through holes;

the swing mechanism (5), the swing mechanism (5) is arranged outside the hopper (1);

the S-shaped valve assembly (6) is rotatably arranged in the hopper (1) through the swing mechanism (5), and one end of the S-shaped valve assembly is respectively communicated with the two through holes of the glasses plate (3) through rotation;

and the conveying pipeline (10) is arranged on the other side surface of the hopper (1), and is communicated with the other end of the S valve assembly (6).

2. The pumping system of a modified concrete pump truck as set forth in claim 1, further comprising:

rabbling mechanism (7), rabbling mechanism (7) rotate to be set up in stock chest (100), rabbling mechanism (7) include:

the two ends of the stirring shaft (71) are rotatably arranged on the hopper (1);

the stirring pieces (72) are two stirring pieces (72) arranged in the storage tank (100), are respectively positioned at two ends of the stirring shaft (71), and rotate along with the stirring shaft (71);

the power device (73), the power device (73) is arranged at one end of the stirring shaft (71) and drives the stirring shaft to rotate.

3. The pumping system of a modified concrete pump truck as set forth in claim 2, wherein said stirring member (72) comprises:

the connecting part (721), the connecting part (721) is sleeved on the stirring shaft (71);

a plurality of stirring rods (722), wherein the stirring rods (722) are arranged on the connecting part (721) in a surrounding manner;

the stirring heads (723) correspond to the stirring rods (722) one by one and are respectively arranged at one end of each stirring rod (722) far away from the connecting part (721), and the stirring heads (723) are arc-shaped plates;

the reinforcing plates (724) are multiple, and the reinforcing plates (724) are respectively arranged on two side faces of the stirring rod (722).

4. The pumping system of a modified concrete pump truck as claimed in claim 2, further comprising a sealing device (8), wherein both ends of the stirring shaft (71) are rotatably disposed on the hopper (1) through the sealing device (8), respectively, and the sealing device (8) comprises:

the stirring shaft (71) is arranged in the bearing seat (81), an inner hole for the stirring shaft (71) to pass through is formed in the bearing seat (81), a first groove is formed in one end face of the bearing seat (81), a second groove is formed in the other end face of the bearing seat, and a third groove is formed in the bottom of the second groove;

a ball bearing (82), the ball bearing (82) disposed within the first groove;

the dustproof rubber pad (83), the dustproof rubber pad (83) is arranged in the second groove;

a first oil seal (84), said first oil seal (84) disposed within said third recess;

the bearing gland (85) is arranged on the bearing seat (81) and used for fixing the ball bearing (82), and a fourth groove is formed in the side surface, close to the ball bearing (82), of the bearing gland (85);

a second oil seal (86), the second oil seal (86) disposed within the fourth recess.

5. The pumping system of a modified concrete pump truck as claimed in claim 4, wherein the bearing seat (81) and the bearing cover (85) are cylindrical, and the edge of the bearing seat (81) and the edge of the bearing cover (85) are provided with a plurality of fixing holes (87) around each other.

6. The pumping system of a modified concrete pump truck as set forth in claim 1, further comprising:

the screen assembly (9) is arranged at the opening of the hopper (1), and one end of the screen assembly (9) is rotatably arranged on the hopper (1).

7. The pumping system of a modified concrete pump truck as claimed in claim 6, wherein said screen assembly (9) comprises:

a first screen (91), wherein one end of the first screen (91) is rotatably arranged on the hopper (1);

a second screen (92), the second screen (92) being disposed on a lower surface of the first screen (91);

and the transmission device (93) drives the second screen (92) to slide to and fro below the first screen (91).

8. The pumping system of a modified concrete pump truck as claimed in claim 7, wherein said transmission means (93) comprises:

the two mounting frames (931) are arranged on the lower surface of the first screen (91) and located at two ends of the first screen (91), the second screen (92) is arranged between the first screen (91) and the mounting frames (931), two strip-shaped holes (932) are correspondingly formed in edges of two sides of the second screen (92) along the length direction of the second screen, two ends of each mounting frame (931) penetrate through the two strip-shaped holes (932) and are arranged on the first screen (91), and first transmission teeth (933) are arranged on two side walls of each strip-shaped hole (932) along the length direction;

rotate wheel (934), it is four to rotate wheel (934), rotates respectively to set up two the tip of mounting bracket (931), and is located in bar hole (932), rotate and be provided with a plurality of second driving tooth (935), a plurality of on the cambered surface of wheel (934) around the arc length less than or equal to that the formation is surrounded to second driving tooth (935) rotate the half of wheel (934) girth, second driving tooth (935) with first driving tooth (933) on the wall of bar hole (932) both sides mesh respectively.

Images