CN108480206B

CN108480206B - Construction machine for screening sand

Info

Publication number: CN108480206B
Application number: CN201810145275.2A
Authority: CN
Inventors: 刘飞云; 李德华; 欧佳宁
Original assignee: JIAXING CHENYANG LUGGAGE CO Ltd
Current assignee: JIAXING CHENYANG LUGGAGE Co.,Ltd.
Priority date: 2018-02-12
Filing date: 2018-02-12
Publication date: 2020-07-21
Anticipated expiration: 2038-02-12
Also published as: CN108480206A

Abstract

The invention relates to construction machinery, in particular to construction machinery for sand screening. The invention aims to provide a construction machine for screening sand, which has high screening efficiency and can screen large-particle sand completely. The invention provides a construction machine for sand screening, which comprises a bottom plate and the like; the bottom left and right sides of bottom plate all is connected with the landing leg, and open at the middle part of bottom plate has first opening, and both ends all are connected with the support about the top of bottom plate, and the inboard upper portion of both sides support all is connected with the diaphragm, controls to be connected with the hopper between the diaphragm on both sides, and the hopper is located directly over first opening, and the top of diaphragm is equipped with first sieving mechanism, is equipped with knocking device in the hopper. According to the invention, the knocking device is used for knocking the first screening device so as to screen the sand, and the second screening device is used for secondarily screening the sand, so that the sand with larger particles is efficiently screened and removed, and the effects of high screening efficiency and clean screening of the sand with larger particles are achieved.

Description

Construction machine for screening sand

Technical Field

The invention relates to construction machinery, in particular to construction machinery for sand screening.

Background

Most of the sand is manufactured manually or is manually ground from certain stones, the particles are relatively larger, the fullness is stronger, and the particles can be clearly sensed to exist when the sand is held in hands. Sand is the primary material that makes up concrete and mortar.

A construction machine is a tool used for on-site construction.

The construction machine for screening the sand needs to be used after screening the sand in the building construction process, the screening efficiency of the existing sand screening equipment is low, and the larger-particle sand cannot be screened completely, so that the construction machine for screening the sand, which has high screening efficiency and can screen the larger-particle sand completely, needs to be researched and developed urgently.

Disclosure of Invention

(1) Technical problem to be solved

The invention aims to overcome the defects that the conventional sand screening equipment is low in screening efficiency and large-particle sand cannot be screened cleanly, and the technical problem to be solved by the invention is to provide the construction machine for screening the sand, which is high in screening efficiency and capable of screening the large-particle sand cleanly.

(2) Technical scheme

In order to solve the technical problem, the invention provides a construction machine for screening sand, which comprises a bottom plate, supporting legs, supports, transverse plates, a hopper, a first screening device and a knocking device, wherein the left side and the right side of the bottom plate are both connected with the supporting legs, the middle of the bottom plate is provided with a first opening, the left end and the right end of the top of the bottom plate are both connected with the supports, the transverse plates are connected to the upper parts of the inner sides of the two side supports, the hopper is connected between the left transverse plate and the right transverse plate, the hopper is positioned right above the first opening, the first screening device is arranged at the top of the transverse plates, the knocking device is arranged in the hopper.

Preferably, first sieving mechanism is including changeing the board, the riser, first spring, first screening frame and handle, the diaphragm top is equipped with changes the board, it is connected with the top of right support to change the board right-hand member, the middle part of changeing the board is opened there is the second opening, the top left and right sides of changeing the board all is connected with the riser, the second opening is located between the riser about, the inboard of both sides riser all is connected with first spring, be connected with first screening frame between the first spring in both sides, first screening frame is located directly over the hopper, the top left side of changeing the board is connected with the handle, the handle is located the riser left side.

Preferably, the knocking device comprises a motor, a first rotating shaft, a first bearing seat, a second spring and steel balls, wherein the motor is installed on the upper portion of the right side of the left support, an output shaft of the motor is connected with the first rotating shaft, the first rotating shaft penetrates through the upper portions of the left side and the right side of the hopper in a sliding mode, the first bearing seat is installed on the upper portion of the left side of the right support, the first rotating shaft is in interference connection with bearings in the first bearing seat, the second spring is connected to the middle of the first rotating shaft at an even interval, the second spring is located in the hopper, the tail end of the second spring is connected with the steel balls, and.

Preferably, the screening device further comprises a second screening device, the second screening device comprises an installation rod, a second bearing seat, a second rotating shaft, bevel gears, a disc, support plates, guide rods, a second screening frame and a first connecting rod, the middle part of the right side of the left support is connected with the installation rod, the second bearing seat is installed at the right end of the installation rod, the second rotating shaft is connected with a bearing in the second bearing seat in an interference fit manner, the bevel gears are installed at the top of the second rotating shaft and the left part of the first rotating shaft respectively, the two bevel gears are meshed, the disc is connected to the bottom of the second rotating shaft, the support plates are connected to the left side and the right side of the top of the bottom plate, the first opening is located between the left support plate and the right support plate, the guide holes are formed in the upper parts of the support plates, the guide rods are arranged in the guide holes on the two sides in a sliding manner and are matched with, the right end of the first connecting rod is hinged with the upper part of the left side of the second screening frame.

Preferably, still including montant, baffle, dog and third spring, the top of left side support is connected with the montant, and the montant outside sliding type is equipped with the baffle, and the top of montant is connected with the dog, is connected with the third spring between baffle and the dog, and the montant passes the third spring.

Preferably, the screening device further comprises a second connecting rod, a cross rod and a shifting rod, wherein the second connecting rod is connected to the left side and the right side of the bottom of the hopper, the cross rods are connected to the bottoms of the second connecting rods on the two sides, the shifting rods are connected to the bottom of the cross rod at even intervals, and the shifting rod is in contact with the bottom in the second screening frame.

The working principle is as follows: when the screening device is used, an operator moves the screening device to a required area, then a proper amount of sand is poured into the first screening device, the knocking device is started to operate, the knocking device knocks the screening part of the first screening device, so that the sand is screened, the sand with smaller particles falls onto the hopper and falls from the hopper through the first opening, the sand with larger particles is left in the first screening device, after screening is completed, the knocking device is closed, the first screening device is rotated, so that the sand with larger particles in the first screening device is poured to the right of the screening device, then the first screening device is rotated, and the first screening device is reset, so that the sand can be screened.

Because first sieving mechanism is including changeing the board, the riser, first spring, first screening frame and handle, the diaphragm top is equipped with changes the board, it is connected with the top of right support to change the board right-hand member, the middle part of changeing the board is opened there is the second opening, the top left and right sides of changeing the board all is connected with the riser, the second opening is located between the riser about, the inboard of both sides riser all is connected with first spring, be connected with first screening frame between the first spring in both sides, first screening frame is located directly over the hopper, the top left side of changeing the board is connected with the handle, the handle is located the riser left side. Therefore, an operator pours a proper amount of sand into the first screening frame, the knocking device is started to knock the bottom of the first screening frame, the first screening frame shakes up and down under the action of the first spring, so that the first screening device screens the sand, the sand can be continuously added into the first screening frame in the using process, the sand can be continuously screened, the sand with smaller particles falls from the hopper through the first opening, the sand with larger particles is left in the first screening frame, after the screening is finished, the knocking device is closed, the rotating plate is rotated clockwise through the handle, so that the first screening frame is driven to rotate clockwise, the sand in the first screening frame is poured to the right side of the rotary table, and after the sand in the first screening frame is completely poured out, the rotating plate is rotated anticlockwise, so that the first screening frame is reset.

Because the knocking device is including the motor, first pivot, primary shaft bearing, second spring and steel ball, the motor is installed on the right side upper portion of the left side support, the output shaft of motor has first pivot, first pivot slidingtype runs through the left and right sides upper portion of hopper, primary shaft bearing is installed on the left side upper portion of the right side support, bearing interference in primary shaft bearing is connected, the even interval in middle part of first pivot is connected with the second spring, the second spring is located the hopper, the end-to-end connection of second spring has the steel ball, steel ball and the cooperation of first screening frame. Therefore, the starting motor rotates, the motor drives the first rotating shaft to rotate, the steel balls are driven to rotate through the second spring, the steel balls knock the bottom of the first screening frame, the first screening frame shakes up and down, sand can be screened, and after the screening is completed, the motor is turned off.

Because the device also comprises a second screening device, the second screening device comprises an installation rod, a second bearing seat, a second rotating shaft, a bevel gear, a disc, a support plate, a guide rod, a second screening frame and a first connecting rod, the right middle part of the left support is connected with the installation rod, the right end of the installation rod is provided with the second bearing seat, a bearing in the second bearing seat is in interference connection with the second rotating shaft, the top of the second rotating shaft and the left part of the first rotating shaft are both provided with the bevel gear, the two bevel gears are meshed, the bottom of the second rotating shaft is connected with the disc, the left side and the right side of the top of the bottom plate are both connected with the support plate, the first opening is positioned between the left support plate and the right support plate, the upper part of the support plate is provided with the guide hole, the guide rod is arranged in a sliding manner in the guide holes on the two sides and is matched with the guide, the right end of the first connecting rod is hinged with the upper part of the left side of the second screening frame. Therefore, the sand falls into the second screening frame from the hopper after being screened by the first screening frame, the first rotating shaft rotates to drive the second rotating shaft to rotate through the bevel gear, so that the disc is driven to rotate, the second screening frame is driven to move left and right through the first connecting rod, the second screening frame moves left and right to perform secondary screening on the sand, and therefore screening efficiency is improved, and screening effect is good.

Because still including montant, baffle, dog and third spring, the top of the support on the left side is connected with the montant, and the montant outside sliding type is equipped with the baffle, and the top of montant is connected with the dog, is connected with the third spring between baffle and the dog, and the montant passes the third spring. Therefore, when the rotating plate needs to be rotated, the baffle plate is rotated leftwards to separate the baffle plate from the rotating plate, the rotating plate can be rotated to dump sand in the first screening frame, the baffle plate is pulled upwards after the rotating plate is reset, the third spring is compressed, then the baffle plate is rotated rightwards to be positioned above the rotating plate, then the baffle plate is loosened, and under the action of the third spring, the baffle plate clamps the rotating plate tightly, so that the rotating plate can be prevented from shaking when the knocking device knocks the first screening frame, the stability of the sand screening device is improved, and the sand screening efficiency is further improved.

Because still including second connecting rod, horizontal pole and driving lever, the bottom left and right sides of hopper all is connected with the second connecting rod, and the bottom of both sides second connecting rod all is connected with the horizontal pole, and the even interval in bottom of horizontal pole is connected with the driving lever, and the driving lever contacts with the bottom in the second screening frame. Therefore, the second screening frame moves left and right, so that the poking rod pokes the sand in the second screening frame, and the screening efficiency is further improved.

(3) Advantageous effects

According to the invention, the knocking device is used for knocking the first screening device so as to screen the sand, and the second screening device is used for secondarily screening the sand, so that the sand with larger particles is efficiently screened and removed, and the effects of high screening efficiency and clean screening of the sand with larger particles are achieved.

Drawings

Fig. 1 is a schematic cross-sectional view of a first front view of the present invention.

Fig. 2 is a cross-sectional schematic view of a second front view of the present invention.

Fig. 3 is a schematic cross-sectional view of a third front view of the present invention.

Fig. 4 is a schematic cross-sectional view of a left side view of a second screening frame of the present invention.

The labels in the figures are: 1-bottom plate, 2-legs, 3-first opening, 4-bracket, 5-cross plate, 6-hopper, 7-first screening device, 71-rotating plate, 72-second opening, 73-riser, 74-first spring, 75-first screening frame, 76-handle, 8-knocking device, 81-motor, 82-first rotating shaft, 83-first bearing seat, 84-second spring, 85-steel ball, 9-second screening device, 91-mounting rod, 92-second bearing seat, 93-second rotating shaft, 94-bevel gear, 95-disk, 96-support plate, 97-guide hole, 98-guide rod, 99-second screening frame, 910-first connecting rod, 10-vertical rod, 11-baffle, 12-a stop block, 13-a third spring, 14-a second connecting rod, 15-a cross rod and 16-a deflector rod.

Detailed Description

The invention is further described below with reference to the figures and examples.

Example 1

The utility model provides a construction machinery for grit screening, as shown in fig. 1-4, including bottom plate 1, landing leg 2, support 4, diaphragm 5, hopper 6, first sieving mechanism 7 and knocking device 8, the bottom left and right sides of bottom plate 1 all is connected with landing leg 2, open at the middle part of bottom plate 1 has first opening 3, both ends all are connected with support 4 about the top of bottom plate 1, the inboard upper portion of both sides support 4 all is connected with diaphragm 5, it is connected with hopper 6 to control between the both sides diaphragm 5, hopper 6 is located directly over first opening 3, the top of diaphragm 5 is equipped with first sieving mechanism 7, be equipped with knocking device 8 in the hopper 6, knocking device 8 cooperates with first sieving mechanism 7.

Example 2

First sieving mechanism 7 is including changeing board 71, riser 73, first spring 74, first screening frame 75 and handle 76, diaphragm 5 top is equipped with changeing board 71, changeing board 71 right-hand member is connected with the top of right support 4 is articulated, the middle part of changeing board 71 is opened there is second opening 72, the top left and right sides of changeing board 71 all is connected with riser 73, second opening 72 is located between the riser 73 about, the inboard of both sides riser 73 all is connected with first spring 74, be connected with first screening frame 75 between the first spring 74 of both sides, first screening frame 75 is located directly over hopper 6, the top left side of changeing board 71 is connected with handle 76, handle 76 is located the riser 73 left side.

Example 3

The knocking device 8 comprises a motor 81, a first rotating shaft 82, a first bearing seat 83, a second spring 84 and steel balls 85, the motor 81 is installed on the upper portion of the right side of the left support 4, an output shaft of the motor 81 is connected with the first rotating shaft 82, the first rotating shaft 82 penetrates through the upper portions of the left side and the right side of the hopper 6 in a sliding mode, the first bearing seat 83 is installed on the upper portion of the left side of the right support 4, the first rotating shaft 82 is in interference connection with bearings in the first bearing seat 83, the second spring 84 is connected to the middle of the first rotating shaft 82 at even intervals, the second spring 84 is located in the hopper 6, the steel balls 85 are connected to the tail ends of the second spring 84, and the steel.

Example 4

The screening device also comprises a second screening device 9, the second screening device 9 comprises an installation rod 91, a second bearing seat 92, a second rotating shaft 93, bevel gears 94, a disc 95, support plates 96, guide rods 98, a second screening frame 99 and a first connecting rod 910, the middle part of the right side of the left support 4 is connected with the installation rod 91, the right end of the installation rod 91 is provided with the second bearing seat 92, bearings in the second bearing seat 92 are connected with the second rotating shaft 93 in an interference manner, the top of the second rotating shaft 93 and the left part of the first rotating shaft 82 are both provided with the bevel gears 94, the two bevel gears 94 are meshed with each other, the bottom of the second rotating shaft 93 is connected with the disc 95, the left side and the right side of the top of the bottom plate 1 are both connected with the support plates 96, the first opening 3 is positioned between the left support plate 96 and the right support plate 96, the upper parts of the support plates 96 are provided with guide holes 97, the second screening frame 99 is located between the hopper 6 and the first opening 3, the eccentric position at the bottom of the disc 95 is hinged with a first connecting rod 910, and the right end of the first connecting rod 910 is hinged with the upper part of the left side of the second screening frame 99.

Still including montant 10, baffle 11, dog 12 and third spring 13, the top of left side support 4 is connected with montant 10, and the slidingtype baffle 11 that is equipped with in the montant 10 outside, the top of montant 10 is connected with dog 12, is connected with third spring 13 between baffle 11 and the dog 12, and montant 10 passes third spring 13.

The automatic feeding device is characterized by further comprising second connecting rods 14, cross rods 15 and shifting rods 16, the left side and the right side of the bottom of the hopper 6 are connected with the second connecting rods 14, the bottoms of the second connecting rods 14 on the two sides are connected with the cross rods 15, the shifting rods 16 are connected to the bottom of the cross rods 15 at uniform intervals, and the shifting rods 16 are in contact with the bottom in the second screening frame 99.

The working principle is as follows: when the screening machine is used, an operator moves the screening machine to a required area, then a proper amount of sand is poured into the first screening device 7, the knocking device 8 is started to operate, the knocking device 8 knocks the screening part of the first screening device 7 to screen the sand, the sand with smaller particles falls onto the hopper 6 and falls from the hopper 6 through the first opening 3, the sand with larger particles is left in the first screening device 7, after screening is completed, the knocking device 8 is closed, the first screening device 7 is rotated, the sand with larger particles in the first screening device 7 is poured to the right of the screening machine, then the first screening device 7 is rotated to reset, and therefore the sand can be screened.

Because first sieving mechanism 7 is including changeing board 71, riser 73, first spring 74, first screening frame 75 and handle 76, diaphragm 5 top is equipped with changeing board 71, changeing board 71 right-hand member is connected with the top of right support 4 is articulated, the middle part of changeing board 71 is opened there is second opening 72, the top left and right sides of changeing board 71 all is connected with riser 73, second opening 72 is located between the riser 73 about, the inboard of both sides riser 73 all is connected with first spring 74, be connected with first screening frame 75 between the first spring 74 of both sides, first screening frame 75 is located directly over hopper 6, the top left side of changeing board 71 is connected with handle 76, handle 76 is located the riser 73 left side. Therefore, the operator pours a proper amount of sand into the first screening frame 75, starts the knocking device 8 to knock the bottom of the first screening frame 75, under the action of the first spring 74, the first screening frame 75 is shaken up and down, so that the first screening device 7 screens sand, which, in use, sand can be continuously added to the first screen frame 75 so that the sand can be continuously screened, smaller particles of sand fall from the hopper 6 through the first opening 3, while the larger sand particles remain in the first screen frame 75, after screening is complete, the rapping device 8 is closed, the rotating plate 71 is then rotated clockwise by the handle 76, thereby rotating the first screening frame 75 clockwise, the sand in the first screen frame 75 is then poured to the right of the present invention, and when the sand in the first screen frame 75 is completely poured out, the rotary plate 71 is rotated counterclockwise to reset the first screen frame 75.

Because the knocking device 8 comprises a motor 81, a first rotating shaft 82, a first bearing seat 83, a second spring 84 and steel balls 85, the motor 81 is installed on the upper portion of the right side of the left support 4, the output shaft of the motor 81 is connected with the first rotating shaft 82, the first rotating shaft 82 penetrates through the upper portions of the left side and the right side of the hopper 6 in a sliding mode, the first bearing seat 83 is installed on the upper portion of the left side of the right support 4, the first rotating shaft 82 is in interference connection with bearings in the first bearing seat 83, the second spring 84 is evenly connected to the middle of the first rotating shaft 82 at intervals, the second spring 84 is located in the hopper 6, the steel balls 85 are connected to the tail ends of the second spring 84, and the steel. Therefore, the motor 81 is started to rotate, the motor 81 drives the first rotating shaft 82 to rotate, the steel ball 85 is driven to rotate through the second spring 84, the steel ball 85 knocks the bottom of the first screening frame 75, the first screening frame 75 shakes up and down, sand can be screened, and after the screening is completed, the motor 81 is turned off.

Because the screening device also comprises a second screening device 9, the second screening device 9 comprises an installation rod 91, a second bearing seat 92, a second rotating shaft 93, bevel gears 94, a disk 95, support plates 96, guide rods 98, a second screening frame 99 and a first connecting rod 910, the middle part of the right side of the left support 4 is connected with the installation rod 91, the right end of the installation rod 91 is provided with the second bearing seat 92, bearings in the second bearing seat 92 are connected with the second rotating shaft 93 in an interference manner, the top of the second rotating shaft 93 and the left part of the first rotating shaft 82 are both provided with the bevel gears 94, the two bevel gears 94 are meshed with each other, the bottom of the second rotating shaft 93 is connected with the disk 95, the left side and the right side of the top of the bottom plate 1 are both connected with the support plates 96, the first opening 3 is positioned between the left support plate 96 and the right support plate 96, the upper parts of the support plates 96 are provided with guide holes 97, the second screening frame 99 is located between the hopper 6 and the first opening 3, the eccentric position at the bottom of the disc 95 is hinged with a first connecting rod 910, and the right end of the first connecting rod 910 is hinged with the upper part of the left side of the second screening frame 99. Therefore, after being screened by the first screening frame 75, the sand falls into the second screening frame 99 from the hopper 6, the first rotating shaft 82 rotates to drive the second rotating shaft 93 to rotate through the bevel gear 94, so as to drive the disc 95 to rotate, further drive the second screening frame 99 to move left and right through the first connecting rod 910, and the second screening frame 99 moves left and right to perform secondary screening on the sand, so that the screening efficiency is improved, and the screening effect is good.

Because still including montant 10, baffle 11, dog 12 and third spring 13, the top of left side support 4 is connected with montant 10, and the slidingtype baffle 11 that is equipped with in the montant 10 outside, the top of montant 10 is connected with dog 12, is connected with third spring 13 between baffle 11 and the dog 12, and montant 10 passes third spring 13. Therefore, when the rotating plate 71 needs to be rotated, the baffle plate 11 is rotated leftwards, so that the baffle plate 11 is separated from the rotating plate 71, the rotating plate 71 can be rotated to dump the sand in the first screening frame 75, the baffle plate 11 is pulled upwards after the rotating plate 71 is reset, the third spring 13 is compressed, then the baffle plate 11 is rotated rightwards, so that the baffle plate 11 is positioned above the rotating plate 71, then the baffle plate 11 is loosened, and the rotating plate 71 is clamped by the baffle plate 11 under the action of the third spring 13, so that the rotating plate 71 can be prevented from shaking when the first screening frame 75 is knocked by the knocking device 8, the stability of the sand screening device is improved, and the sand screening efficiency is further improved.

Because still including second connecting rod 14, horizontal pole 15 and driving lever 16, the bottom left and right sides of hopper 6 all is connected with second connecting rod 14, and the bottom of both sides second connecting rod 14 all is connected with horizontal pole 15, and the even interval in bottom of horizontal pole 15 is connected with driving lever 16, and driving lever 16 and the contact of the bottom in the second screening frame 99. Therefore, the second screening frame 99 moves left and right, so that the deflector rod 16 can deflect the sand in the second screening frame 99, thereby further improving the screening efficiency.

The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The construction machine for screening the sand is characterized by comprising a bottom plate (1), supporting legs (2), supports (4), transverse plates (5), a hopper (6), a first screening device (7) and a knocking device (8), wherein the supporting legs (2) are connected to the left side and the right side of the bottom plate (1), a first opening (3) is formed in the middle of the bottom plate (1), the supports (4) are connected to the left end and the right end of the top of the bottom plate (1), the transverse plates (5) are connected to the upper portions of the inner sides of the supports (4) on the two sides, the hopper (6) is connected between the transverse plates (5) on the left side and the right side, the hopper (6) is located right above the first opening (3), the first screening device (7) is arranged on the top of the transverse plates (5), the knocking device (8) is arranged in the hopper (6), and the knocking device (; the first screening device (7) comprises a rotating plate (71), vertical plates (73), first springs (74), first screening frames (75) and handles (76), the rotating plate (71) is arranged above the transverse plate (5), the right end of the rotating plate (71) is hinged to the top of the right support (4), a second opening (72) is formed in the middle of the rotating plate (71), the vertical plates (73) are connected to the left side and the right side of the top of the rotating plate (71), the second opening (72) is located between the left vertical plate (73) and the right vertical plate (73), the first springs (74) are connected to the inner sides of the vertical plates (73) on two sides, the first screening frames (75) are connected between the first springs (74) on two sides, the first screening frames (75) are located right above the hopper (6), the handles (76) are connected to the left side of the top of the rotating plate (71), and the handles (76) are located on the left side; the knocking device (8) comprises a motor (81), a first rotating shaft (82), a first bearing seat (83), a second spring (84) and steel balls (85), the motor (81) is installed on the upper portion of the right side of the left support (4), an output shaft of the motor (81) is connected with the first rotating shaft (82), the first rotating shaft (82) penetrates through the upper portions of the left side and the right side of the hopper (6) in a sliding mode, the first bearing seat (83) is installed on the upper portion of the left side of the right support (4), the first rotating shaft (82) is in interference connection with bearings in the first bearing seat (83), the second spring (84) is evenly connected to the middle of the first rotating shaft (82) at intervals, the second spring (84) is located in the hopper (6), the tail end of the second spring (84) is connected with the steel balls (85), and the steel balls (85) are matched; the screening device comprises a left support (4), a right support (92), a first rotating shaft (93), a bevel gear (94), a disc (95), support plates (96), a guide rod (98), a first screening frame (99) and a first connecting rod (910), wherein the mounting rod (91) is connected to the middle of the right side of the left support (4), the second bearing (92) is mounted at the right end of the mounting rod (91), a second rotating shaft (93) is connected to a bearing in the second bearing (92) in an interference manner, the bevel gears (94) are mounted at the top of the second rotating shaft (93) and the left part of the first rotating shaft (82), the two bevel gears (94) are meshed with each other, the disc (95) is connected to the bottom of the second rotating shaft (93), the support plates (96) are connected to the left and the right sides of the top of a bottom plate (1), a first opening (3) is positioned between the left support plate and the right support plate (, guide holes (97) are formed in the upper portions of the support plates (96), guide rods (98) are arranged in the guide holes (97) on the two sides in a sliding mode, the guide rods (98) are matched with the guide holes (97), a second screening frame (99) is connected between the guide rods (98) on the two sides, the second screening frame (99) is located between the hopper (6) and the first opening (3), a first connecting rod (910) is hinged to the eccentric position of the bottom of the disc (95), and the right end of the first connecting rod (910) is hinged to the upper portion of the left side of the second screening frame (99).

2. The construction machine for sand screening according to claim 1, further comprising a vertical rod (10), a baffle (11), a stop block (12) and a third spring (13), wherein the vertical rod (10) is connected to the top of the left support (4), the baffle (11) is slidably arranged on the outer side of the vertical rod (10), the stop block (12) is connected to the top of the vertical rod (10), the third spring (13) is connected between the baffle (11) and the stop block (12), and the vertical rod (10) penetrates through the third spring (13).

3. The construction machine for sand screening according to claim 2, further comprising a second connecting rod (14), a cross rod (15) and a shifting lever (16), wherein the second connecting rod (14) is connected to the left side and the right side of the bottom of the hopper (6), the cross rods (15) are connected to the bottoms of the second connecting rods (14) on two sides, the shifting levers (16) are connected to the bottoms of the cross rods (15) at uniform intervals, and the shifting levers (16) are in contact with the bottom inside the second screening frame (99).