CN111215205A

CN111215205A - Can prevent screening sand machine for construction of filter screen jam

Info

Publication number: CN111215205A
Application number: CN201911206272.6A
Authority: CN
Inventors: 单春元
Original assignee: Anhui Lexiu Information Technology Co Ltd
Current assignee: Anhui Lexiu Information Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-02

Abstract

The invention relates to the technical field of sand screening equipment, in particular to a sand screening machine for building construction, which can prevent a filter screen from being blocked; on the one hand, coarse sand enters the crushing cavity from the feed hopper and is crushed under the action of the crushing cutter; on the other hand, the second rotating shaft also drives the fourth rotating shaft to rotate through the coupler, the crank throw rotates along with the fourth rotating shaft, and the first connecting rod and the second connecting rod drive the filter screen to swing left and right, so that the filtering efficiency is improved, and the filter screen is prevented from being blocked; the filter pipe is detachably connected with the shell, and is matched with a coupling connection mode of a fourth rotating shaft and a second rotating shaft, so that the filter pipe is convenient to integrally disassemble, and coarse sand is convenient to clean; still utilize No. two pivots to drive a cylinder cam and rotate, drive the baffle through a branch and reciprocate, make the periodic business turn over inlet pipe of baffle, carry out shutoff or intercommunication to the feeding, realize intermittent type feeding.

Description

Can prevent screening sand machine for construction of filter screen jam

Technical Field

The invention relates to the technical field of sand screening equipment, in particular to a sand screening machine for building construction, which can prevent a filter screen from being blocked.

Background

The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object at a specified place.

The construction can be roughly divided into foundation engineering construction, main structure construction, roofing engineering construction, decoration engineering construction and the like. The site of the construction work is called a "construction site" or "job site", also called a worksite.

The construction is a production movement performed by people to construct various building products in a certain space and time according to a specific design blueprint by using various building materials and mechanical equipment.

The construction includes all production processes from construction preparation, earth breaking and engineering completion acceptance. In the process, construction preparation, construction organization design and management, earthwork engineering, blasting engineering, foundation engineering, reinforcing steel bar engineering, template engineering, scaffold engineering, concrete engineering, prestressed concrete engineering, masonry engineering, steel structure engineering, wood structure engineering, structure installation engineering and the like are carried out.

The building construction is a production process with complex technology, and building construction workers need to exert clever and talent intelligence to creatively apply theories such as materials, mechanics, structures, processes and the like to solve the technical problems which continuously appear in the construction, thereby ensuring the engineering quality and the construction safety. The construction process is carried out by multiple workers in limited time and space. The supply of hundreds of materials and the operation of various mechanical equipment, so that scientific and advanced organization and management measures and advanced construction processes are necessary to fully complete the production process, and the process is a process with higher economy. A great deal of manpower, material resources and financial resources are consumed in construction. Therefore, it is required to take measures to reduce the cost by considering the economic benefit everywhere in the construction process. The focus of attention in the construction process is always the quality of the project, the progress of safety (including environmental protection) and the cost.

In the process of building construction, the sand screening is often needed. The sand screening is, as the name suggests, to filter the sand by a net woven by iron wires. The traditional mode is to support an inclined screen, and the sand and the screen are manually shoveled to perform screening. Obviously, the mode is corresponding to the large consumption of manual physical strength and lower efficiency. Therefore, the sand screening machine is not used for a sand screening machine, but when the sand screening machine is used, fine sand can only be screened from the net, coarse sand often blocks the filter net to influence the screening effect of the filter net, and even the sand screening operation can not be carried out in serious conditions, so that the engineering progress is slowed.

Disclosure of Invention

Technical problem to be solved

The invention aims to overcome the defects in the prior art and provide a sand screening machine for building construction, which can prevent a filter screen from being blocked.

(II) technical scheme

A sand screening machine for building construction capable of preventing filter screen from being blocked comprises a shell and a filter pipe;

a clapboard is arranged in the shell and divides the inner cavity of the shell into a transmission cavity and a crushing cavity from top to bottom;

a servo motor is arranged at the top of the transmission cavity, the output end of the servo motor is downwards connected with a vertical first rotating shaft, and the first rotating shaft penetrates through the partition plate and extends into the crushing cavity; a second parallel rotating shaft is arranged on the right side of the first rotating shaft, a first gear is arranged on the first rotating shaft and is positioned above the partition plate, a second gear is correspondingly arranged on the second rotating shaft and is meshed with the first gear, the second rotating shaft also penetrates through the partition plate and extends into the crushing cavity, and staggered crushing cutters are correspondingly arranged on sections, positioned in the crushing cavity, of the first rotating shaft and the second rotating shaft;

the upper part of the crushing cavity is connected with a feed hopper; the bottom of the crushing cavity is of a necking structure and is connected with a blanking pipe, and the bottom end of the blanking pipe is connected with a filter pipe; a filter screen in the horizontal direction is arranged in the filter pipe, an inserting groove is formed in the inner wall of the filter pipe, the filter screen is inserted in the inserting groove and a shaking buffer gap is reserved between the filter screen and the inserting groove at the left end and the right end, the right end of the filter screen is also connected with a second connecting rod, and the second connecting rod penetrates through the filter pipe and is hinged with one end of the first connecting rod; the outer side of the right wall of the filter pipe is provided with spaced supporting seats, a fourth rotating shaft is rotatably connected between the supporting seats, a crank throw is arranged on the fourth rotating shaft, the crank throw is provided with a sleeve, and the sleeve is connected with the other end of the first connecting rod; the top end of the fourth rotating shaft penetrates through the supporting seat and is connected with the bottom end of the second rotating shaft extending out of the crushing cavity through a coupler; the crank throw rotates along with the fourth rotating shaft, and the filter screen is driven to swing left and right through the first connecting rod and the second connecting rod, so that the filter screen is prevented from being blocked.

Preferably, the filter pipe is detachably connected with the blanking pipe; the top end of the filter pipe and the bottom end of the blanking pipe are correspondingly provided with fixing threaded holes, and the filter pipe and the blanking pipe are connected into a whole by adopting a connecting plate and a fixing screw.

Preferably, still include the feeder hopper, the feeder hopper setting is on the casing right side, and the feeder hopper top is provided with the charge door, the bottom through the conveying pipeline of left downdip with smash chamber upper portion intercommunication.

Preferably, a first cylindrical cam is further arranged on the second rotating shaft, the first cylindrical cam is matched with a first roller, the first roller is connected with a first supporting rod rightwards, and the first supporting rod penetrates through the right side wall of the transmission cavity and is connected with a baffle downwards; the right side wall of the transmission cavity is also provided with a vertical first guide channel corresponding to the motion path of the first support rod; the top surface of the material conveying pipe is provided with a baffle sleeve communicated with the material conveying pipe, and the baffle is inserted into the baffle sleeve; a cylinder cam rotates, drives the baffle through a branch and reciprocates, makes the periodic business turn over inlet pipe of baffle, carries out shutoff or intercommunication to the inlet pipe.

Preferably, a third parallel rotating shaft is further arranged on the left side of the first rotating shaft, a third gear is arranged on the third rotating shaft corresponding to the first gear, the third gear is meshed with the first gear, the third rotating shaft also penetrates through the partition plate and extends into the crushing cavity, and the first rotating shaft and the third rotating shaft are arranged in the crushing cavity, and are correspondingly provided with staggered crushing cutters.

Preferably, a second cylindrical cam is further arranged on the third rotating shaft, the second cylindrical cam is matched with a second roller, the second roller is connected with a second supporting rod leftwards, and the second supporting rod penetrates through the left side wall of the transmission cavity and is connected with a third supporting rod downwards; a vertical second guide through groove corresponding to the motion path of the second support rod is formed in the left side wall of the transmission cavity; the lower section of the third support rod is a rack with teeth on the front and back surfaces, symmetrical driving gears are meshed on the front and back sides of the rack, the driving gears are connected with rotating shafts, and the rotating shafts extend into the discharging pipe and are provided with crushing rollers.

Preferably, the casing is further fixedly connected with a support plate corresponding to the rotating shaft, and the rotating shaft penetrates through and is rotatably connected with the support plate.

Preferably, a material receiving basket is arranged below the filtering pipe; the top ends of the second rotating shaft and the third rotating shaft are rotatably connected with the shell.

Preferably, the support comprises a base, a vertical plate and a top plate, the vertical plate is fixedly connected to the left end of the base, and the top of the vertical plate is connected with the shell through the top plate rightwards; the material receiving basket is placed on the base; a guide plate is further arranged on the left side of the vertical plate, and the third support rod vertically penetrates through the guide plate.

Preferably, a material guide hopper is arranged below the discharging pipe corresponding to the crushing roller, and the material guide hopper is of a necking structure with a large upper part and a small lower part.

(III) advantageous effects

The invention provides a sand screening machine for building construction, which can prevent a filter screen from being blocked, and has the following advantages:

the method comprises the following steps that 1, a first rotating shaft is driven to rotate based on a servo motor, and a second rotating shaft is driven to rotate through gear transmission, so that on one hand, coarse sand enters a crushing cavity from a feed hopper and is crushed under the action of a crushing knife; on the other hand, the second rotating shaft also drives the fourth rotating shaft to rotate through the coupler, the crank throw rotates along with the fourth rotating shaft, and the first connecting rod and the second connecting rod drive the filter screen to swing left and right, so that the filtering efficiency is improved, and the filter screen is prevented from being blocked;

2, the filter pipe is detachably connected with the shell, and is matched with a coupling connection mode of a fourth rotating shaft and a second rotating shaft, so that the filter pipe is convenient to integrally disassemble, and coarse sand is convenient to clean;

3, a first cylindrical cam is driven to rotate by a second rotating shaft, and a baffle plate is driven to move up and down by a first supporting rod, so that the baffle plate periodically enters and exits from the feeding pipe, the feeding is blocked or communicated, and the intermittent feeding is realized;

4, still drive No. three pivots through gear revolve and rotate, No. two cylinder cams then rotate, drive No. three branch up-and-down motion through No. two branches to make the rack drive gear and rotate, finally drive crushing roller and rotate, thereby make the coarse sand that falls into crushing chamber to the primary crushing through smashing the sword, realize the regrinding through smashing the roller again.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only for the present invention and protect some embodiments, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a block diagram of station A of the present invention;

FIG. 2 is a block diagram of station B of the present invention;

FIG. 3 is a block diagram of the housing;

FIG. 4 is a block diagram of another perspective of the housing;

FIG. 5 is a block diagram of a filter tube;

FIG. 6 is a block diagram of another perspective of a filter tube;

FIG. 7 is a block diagram of the feed hopper;

FIG. 8 is a structural view of a rack;

fig. 9 is a structural view of the blanking pipe.

In the drawings, the components represented by the respective reference numerals are listed below:

1-a base, 101-a vertical plate, 102-a top plate and 103-a guide plate;

2-receiving a basket;

3-shell, 301-transmission cavity, 3011-first guide channel, 3012-second guide through groove, 302-partition plate, 303-crushing cavity, 304-blanking pipe, 305-guide hopper, 306-support plate and 307-connecting plate;

4-feed hopper, 401-feed inlet, 402-conveying pipeline, 403-baffle sleeve;

501-a coupler, 502-a fourth rotating shaft, 503-a crank, 504-a supporting seat, 505-a sleeve, 506-a first connecting rod, 507-a second connecting rod and 508-a filter screen;

6-filter pipe, 601-slot;

701-servo motor, 702-first rotating shaft, 703-first gear, 704-second rotating shaft, 705-second gear, 706-first cylindrical cam, 707-first roller, 708-first supporting rod, 709-baffle, 710-crushing knife, 711-third rotating shaft, 712-second cylindrical cam, 713-second roller, 714-second supporting rod, 715-second gear, 716-third supporting rod and 717-rack;

801-drive gear, 802-rotation shaft, 803-grinding roller.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Example 1

A sand screening machine for building construction capable of preventing filter screen from blocking comprises a shell 3 and a filter pipe 6;

a partition plate 302 is fixedly connected in the shell 3 to divide the inner cavity of the shell 3 into a transmission cavity 301 and a crushing cavity 303 from top to bottom;

a servo motor 701 is installed at the top of the transmission cavity 301, the output end of the servo motor 701 is connected with a vertical first rotating shaft 702 downwards, and the first rotating shaft 702 penetrates through the partition plate 302 and extends into the crushing cavity 303; a second parallel rotating shaft 704 is arranged on the right side of the first rotating shaft 702, a first gear 703 is arranged on the first rotating shaft 702, the first gear 703 is positioned above the partition plate 302, a second gear 705 is correspondingly arranged on the second rotating shaft 704, the second gear 705 is meshed with the first gear 703, the second rotating shaft 704 also penetrates through the partition plate 302 and extends into the crushing cavity 303, and staggered crushing cutters 710 are correspondingly arranged on sections, positioned in the crushing cavity 303, of the first rotating shaft 702 and the second rotating shaft 704;

the upper part of the crushing cavity 303 is connected with a feed hopper 4; the bottom of the crushing cavity 303 is of a necking structure and is connected with a discharging pipe 304, and the bottom end of the discharging pipe 304 is connected with a filter pipe 6; a filter screen 508 in the horizontal direction is arranged in the filter pipe 6, an inserting groove 601 is formed in the inner wall of the filter pipe 6, the filter screen 508 is inserted into the inserting groove 601 and forms a shaking buffer gap with the inserting grooves 601 at the left end and the right end, the right end of the filter screen 508 is also connected with a second connecting rod 507, and the second connecting rod 507 penetrates through the filter pipe 6 and is hinged with one end of the first connecting rod 506; the outer side of the right wall of the filter pipe 6 is fixedly connected with spaced supporting seats 504, a fourth rotating shaft 502 is rotatably connected between the supporting seats 504, a crank 503 is arranged on the fourth rotating shaft 502, a sleeve 505 is arranged on the crank 503, and the sleeve 505 is connected with the other end of the first connecting rod 506; the top end of the fourth rotating shaft 502 penetrates through the supporting seat 504 and is connected with the bottom end of the second rotating shaft 704 extending out of the crushing cavity 303 through the coupler 501.

Specifically, the servo motor 701 is started, the first rotating shaft 702 starts to rotate, and the second rotating shaft 704 is driven to rotate through the transmission of the first gear 703 and the second gear 705, so that on one hand, coarse sand enters the crushing cavity 303 from the feed hopper 4 and is crushed under the action of the crushing knife 710; on the other hand, the second rotating shaft 704 further drives the fourth rotating shaft 502 to rotate through the coupler 501, the crank 503 rotates along with the fourth rotating shaft 502, the first connecting rod 506 and the second connecting rod 507 drive the filter screen 508 to shake left and right, the filtering efficiency is improved, and the filter screen is prevented from being blocked.

Example 2

Wherein the filter pipe 6 is detachably connected with the blanking pipe 304. The top end of the filter pipe 6 and the bottom end of the blanking pipe 304 are correspondingly provided with fixing threaded holes, and the filter pipe 6 and the blanking pipe 304 are connected into a whole by adopting a connecting plate 307 and fixing screws.

In this way, the fourth rotating shaft 502 is connected with the second rotating shaft 704 by the coupler 501, and can be detached. Therefore, after the device is used for a period of time, when more coarse sand is left on the filter screen 508, the whole filter pipe 6 can be detached, and the coarse sand is conveniently cleaned.

Example 3

Still include feeder hopper 4, feeder hopper 4 sets up on the casing 3 right side, and feeder hopper 4 top is equipped with charge door 401, bottom through the conveying pipeline 402 and the crushing chamber 303 upper portion intercommunication that inclines down left.

A first cylindrical cam 706 is further mounted on the second rotating shaft 704, the first cylindrical cam 706 is matched with a first roller 707, the first roller 707 is connected with a first supporting rod 708 rightwards, and the first supporting rod 708 penetrates through the right side wall of the transmission cavity 301 and is connected with a baffle 709 downwards; the right side wall of the transmission cavity 301 is also provided with a vertical first guide channel 3011 corresponding to the motion path of the first support rod 708; the top surface of the material conveying pipe 402 is provided with a baffle sleeve 403 communicated with the material conveying pipe 402, and a baffle 709 is inserted into the baffle sleeve 403.

Specifically, when the second rotating shaft 704 rotates, the first cylindrical cam 706 rotates, and the first supporting rod 708 drives the baffle 403 to move up and down, so that the baffle 709 enters and exits the feeding pipe 402 periodically, the feeding pipe 402 is blocked or communicated, and intermittent feeding is realized.

Example 4

Wherein, the left side of the first rotating shaft 702 is also provided with a third rotating shaft 711 which is parallel, the third rotating shaft 711 is provided with a third gear 715 corresponding to the first gear 703, the third gear 715 is meshed with the first gear 703, the third rotating shaft 711 also passes through the partition plate 302 and extends into the crushing cavity 303, the sections of the first rotating shaft 702 and the third rotating shaft 711 in the crushing cavity 303 are correspondingly provided with staggered crushing cutters 710,

the principle is the same with the third rotating shaft 711, and the third rotating shaft 711 rotates along with the third rotating shaft 711, so that the crushing action area is enlarged.

A second cylindrical cam 712 is further mounted on the third rotating shaft 711, the second cylindrical cam 712 is matched with a second roller 713, the second roller 713 is connected with a second supporting rod 714 leftwards, and the second supporting rod 714 penetrates through the left side wall of the transmission cavity 301 and is connected with a third supporting rod 716 downwards; a vertical second guiding through groove 3012 corresponding to the motion path of the second supporting rod 714 is formed in the left side wall of the transmission cavity 301; the lower section of the third support bar 716 is provided with a rack 717 with teeth on the front and back surfaces, the front and back sides of the rack 717 are engaged with symmetrical driving gears 801, the driving gears 801 are connected with a rotating shaft 802, and the rotating shaft 802 extends into the blanking pipe 304 and is connected with a crushing roller 803.

Thus, the third shaft 711 rotates, the second cylindrical cam 712 rotates, and the third rod 716 is driven by the second rod 714 to move up and down, so that the rack 717 drives the driving gear 801 to rotate, and finally the crushing roller 803 is driven to rotate. The coarse sand falling into the crushing cavity 303 is subjected to primary crushing by the crushing knife 710 and secondary crushing by the crushing roller 803.

Example 5

Wherein, the casing 3 is further fixedly connected with a support plate 306 corresponding to the rotating shaft 802, and the rotating shaft 802 penetrates and is rotatably connected with the support plate 306, so as to ensure the motion stability of the rotating shaft 802.

Wherein, a material receiving basket 2 is arranged below the filter pipe 6 and used for receiving materials; the top ends of the second rotating shaft 704 and the third rotating shaft 711 are rotatably connected with the shell 3, so that the rotating stability is ensured.

The support comprises a base 1, a vertical plate 101 and a top plate 102, the vertical plate 101 is fixedly connected to the left end of the base 1, and the top of the vertical plate 101 is connected with the shell 3 through the top plate 102 rightwards; the receiving basket 2 is placed on the base 1, so that the replacement is convenient; a guide plate 103 is further fixedly connected to the left side of the vertical plate 101, and a third supporting rod 716 vertically penetrates through the guide plate 103 to ensure vertical movement of the guide plate 103.

The material guide hopper 305 is arranged below the discharging pipe 305 corresponding to the crushing roller 803, the material guide hopper 305 is of a throat structure with a large upper part and a small lower part, and crushed fine sand is concentrated on the filter screen 508.

It should be noted that the electrical components are all provided with power supplies, and the control method is the prior art, and is generally described herein for avoiding the redundancy of the description.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sand screening machine for building construction capable of preventing a filter screen from being blocked is characterized by comprising a shell (3) and a filter pipe (6);

a partition plate (302) is arranged in the shell (3) to vertically divide the inner cavity of the shell (3) into a transmission cavity (301) and a crushing cavity (303);

the top of the transmission cavity (301) is provided with a servo motor (701), the output end of the servo motor (701) is downwards connected with a vertical first rotating shaft (702), and the first rotating shaft (702) penetrates through the partition plate (302) and extends into the crushing cavity (303); a second parallel rotating shaft (704) is arranged on the right side of the first rotating shaft (702), a first gear (703) is arranged on the first rotating shaft (702), the first gear (703) is positioned above the partition plate (302), a second gear (715) (705) is correspondingly arranged on the second rotating shaft (704), the second gear (715) (705) is meshed with the first gear (703), the second rotating shaft (704) also penetrates through the partition plate (302) and extends into the crushing cavity (303), and staggered crushing knives (710) are correspondingly arranged on the inner sections of the first rotating shaft (702) and the second rotating shaft (704) positioned in the crushing cavity (303);

the upper part of the crushing cavity (303) is connected with a feed hopper (4); the bottom of the crushing cavity (303) is of a necking structure and is connected with a blanking pipe (304), and the bottom end of the blanking pipe (304) is connected with a filter pipe (6); a filter screen (508) in the horizontal direction is arranged in the filter pipe (6), an inserting groove (601) is formed in the inner wall of the filter pipe (6), the filter screen (508) is inserted into the inserting groove (601) and a shaking buffer gap is reserved between the filter screen and the inserting groove (601) at the left end and the right end, the right end of the filter screen (508) is further connected with a second connecting rod (507), and the second connecting rod (507) penetrates through the filter pipe (6) and is hinged to one end of the first connecting rod (506); the outer side of the right wall of the filter pipe (6) is provided with spaced supporting seats (504), a fourth rotating shaft (502) is rotatably connected between the supporting seats (504), a crank (503) is arranged on the fourth rotating shaft (502), the crank (503) is provided with a sleeve (505), and the sleeve (505) is connected with the other end of the first connecting rod (506); the top end of the fourth rotating shaft (502) penetrates through the supporting seat (504) and is connected with the bottom end of the second rotating shaft (704) extending out of the crushing cavity (303) through the coupler (501); the crank throw (503) rotates along with the fourth rotating shaft (502), and the first connecting rod (506) and the second connecting rod (507) drive the filter screen (508) to shake left and right, so that the filter screen (508) is prevented from being blocked.

2. The sand screening machine for building construction capable of preventing the filter screen from being blocked according to claim 1, wherein the filter pipe (6) is detachably connected with a discharge pipe (304); the top end of the filter pipe (6) is correspondingly provided with a fixing threaded hole with the bottom end of the blanking pipe (304), and the filter pipe (6) and the blanking pipe (304) are connected into a whole by adopting a connecting plate (307) and a fixing screw.

3. The sand screening machine capable of preventing the filter screen from being blocked for the building construction as claimed in claim 2, further comprising a feed hopper (4), wherein the feed hopper (4) is arranged at the right side of the shell (3), a feed inlet (401) is arranged at the top of the feed hopper (4), and the bottom end of the feed hopper is communicated with the upper part of the crushing cavity (303) through a feed delivery pipe (402) which inclines leftwards and downwards.

4. The sand screening machine capable of preventing the filter screen from being blocked for the building construction as claimed in claim 3, wherein a first cylindrical cam (706) is further arranged on the second rotating shaft (704), the first cylindrical cam (706) is matched with a first roller (707), the first roller (707) is connected with a first support rod (708) rightwards, and the first support rod (708) penetrates through the right side wall of the transmission cavity (301) and is connected with a baffle plate (709) downwards; the right side wall of the transmission cavity (301) is also provided with a vertical first guide channel (3011) corresponding to the motion path of the first support rod (708); the top surface of the material conveying pipe (402) is provided with a baffle sleeve (403) communicated with the material conveying pipe (402), and a baffle (709) is inserted into the baffle sleeve (403); the first cylindrical cam (706) rotates, the baffle (709) is driven to move up and down through the first supporting rod (708), so that the baffle (709) can periodically enter and exit the feeding pipe, and the feeding pipe is blocked or communicated.

5. The sand screening machine capable of preventing the filter screen from being blocked for the building construction as claimed in claim 4, wherein a third parallel rotating shaft (711) is further arranged on the left side of the first rotating shaft (702), the third rotating shaft (711) is provided with a third gear corresponding to the first gear (703), the third gear is meshed with the first gear (703), the third rotating shaft (711) also penetrates through the partition plate (302) and extends into the crushing cavity (303), and staggered crushing knives (710) are correspondingly arranged on the inner sections of the crushing cavity (303) where the first rotating shaft (702) and the third rotating shaft (711) are located.

6. The sand screening machine capable of preventing the filter screen from being blocked for the building construction according to claim 5, wherein a second cylindrical cam (712) is further arranged on the third rotating shaft (711), the second cylindrical cam (712) is matched with a second roller (713), the second roller (713) is connected with a second strut (714) leftwards, and the second strut (714) penetrates through the left side wall of the transmission cavity (301) and is connected with a third strut (716) downwards; the left side wall of the transmission cavity (301) is also provided with a vertical second guide through groove (3012) corresponding to the motion path of the second support rod (714); the lower section of the third supporting rod (716) is provided with a rack (717) with teeth on the front and back surfaces, the front side and the back side of the rack (717) are meshed with symmetrical driving gears (801), the driving gears (801) are connected with rotating shafts (802), and the rotating shafts (802) extend into the discharging pipe (304) and are provided with crushing rollers (803).

7. The sand screening machine for building construction capable of preventing the filter screen from being blocked according to claim 6, wherein the housing (3) is further fixedly connected with a support plate (306) corresponding to the rotating shaft (802), and the rotating shaft (802) penetrates through and is rotatably connected with the support plate (306).

8. The sand screening machine for building construction capable of preventing the filter screen from being blocked according to claim 7, wherein a receiving basket (2) is arranged below the filter pipe (6); the top ends of the second rotating shaft (704) and the third rotating shaft (711) are rotatably connected with the shell (3).

9. The sand screening machine capable of preventing the filter screen from being blocked for the building construction according to claim 8, further comprising a bracket, wherein the bracket comprises a base (1), a vertical plate (101) and a top plate (102), the vertical plate (101) is fixedly connected to the left end of the base (1), and the top of the vertical plate (101) is connected with the shell (3) through the top plate (102) rightwards; the receiving basket (2) is placed on the base (1); a guide plate (103) is further arranged on the left side of the vertical plate (101), and a third supporting rod (716) vertically penetrates through the guide plate (103).

10. The sand screening machine for building construction capable of preventing the filter screen from being blocked according to claim 9, wherein a material guide hopper (305) is arranged below the blanking pipe (304) corresponding to the crushing roller (803), and the material guide hopper (305) is of a throat structure with a large upper part and a small lower part.