Gravel screening device for road construction

Abstract

The invention relates to the technical field of gravel screening, in particular to a gravel screening device for road construction, and solves the problems that when gravel for road construction is screened in the prior art, the gravel input amount is too large, so that a screening structure is clamped, the gravel screening speed is inconvenient to control, and the screening effect is poor. Comprising a screening and guiding mechanism and a screening and separating mechanism, a feeding conveyor is installed at the front end of the screening and guiding mechanism, the screening and separating mechanism is installed on the inner side of the upper end of the screening and guiding mechanism, a spiral conveyor is installed at the rear end of the screening and guiding mechanism, and the screening and guiding mechanism comprises two supporting frames; a screening box is fixedly mounted at the upper ends of the two supporting frames, and adjusting rods are rotationally connected to the two sides of the screening box correspondingly. According to the gravel screening device, vibration screening and secondary cleaning are conducted on gravel, the cleanliness of the screened gravel can be effectively improved, automatic jacking is conveniently conducted during gravel screening, then clamping stagnation of the gravel is avoided, and the screening effect is kept.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel screening, in particular to a sand and gravel screening device for road construction. Background Art

[0002] In road construction, gravel is an indispensable material used for laying roadbeds, pavements, etc. However, gravel directly obtained from the excavation site often contains stones of different sizes, which need to be screened to ensure the quality and applicability of the gravel. Screening gravel can remove impurities and large stones that do not meet the requirements, improve the uniformity and stability of gravel, and thus meet the quality requirements of road construction.

[0003] In the existing screening of sand and gravel for road construction, excessive sand and gravel input can easily cause the screening structure to get stuck, and it is inconvenient to control the sand and gravel screening rate, resulting in poor screening effect; therefore, it does not meet the existing needs, and we propose a sand and gravel screening device for road construction. Summary of the invention

[0004] The purpose of the present invention is to provide a sand and gravel screening device for road construction, so as to solve the problem raised in the above background technology that when screening sand and gravel for road construction, the excessive input of sand and gravel can easily cause the screening structure to get stuck, and it is inconvenient to control the sand and gravel screening rate, resulting in poor screening effect.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sand and gravel screening device for road construction, comprising a screening and guiding mechanism and a screening and separation mechanism, a feeding conveyor is installed at the front end of the screening and guiding mechanism, a screening and separation mechanism is installed on the inner side of the upper end of the screening and guiding mechanism, a screw conveyor is installed at the rear end of the screening and guiding mechanism, the screening and guiding mechanism comprises two support frames, a screening box is fixedly installed at the upper ends of the two support frames, both sides of the screening box are rotatably connected with adjustment rods, a transmission plate is installed in the middle of the adjustment rod, and a blocking plate is fixedly installed on the outer side of the transmission plate; The screening and separation mechanism includes a vibrating separation plate, which is rotatably connected to the screening box through a connecting shaft, a mounting frame is fixedly installed on the side of the upper end surface of the vibrating separation plate, three flat corrugated plates are installed on the inner side of the mounting frame, and a plurality of sieve holes are provided on the upper end surface of the vibrating separation plate, and a follower seat is installed in the middle of both sides of the vibrating separation plate, four motor mounting seats are fixedly installed on one side of two of the follower seats, and a fourth transmission motor is fixedly installed between two adjacent motor mounting seats, and a transmission disk is fixedly installed on the output end of the fourth transmission motor, and a transmission connecting rod is rotatably connected between the transmission disk and the follower seat, and a lifting plate is installed below the vibrating separation plate, and a plurality of lifting cone blocks are provided on the upper end surface of the lifting plate, and two guide seats are fixedly installed on both sides of the lifting plate.

[0006] Preferably, the loading conveyor includes a conveyor frame, a first transmission motor is fixedly installed at the front end of one side of the conveyor frame, a conveyor belt is rotatably connected to the inner side of the conveyor frame, transmission rollers are installed on the inner sides of both ends of the conveyor belt, a plurality of feed baffles are provided on the outer surface of the conveyor belt, two leveling inclined plates are fixedly installed on the inner side of the upper end of the first transmission motor, the output end of the first transmission motor passes through the conveyor frame and is fixedly connected to one of the transmission rollers, the conveyor belt and the conveyor frame are rotatably connected via two transmission rollers, and the two leveling inclined plates are linearly arranged along the side of the conveyor belt.

[0007] Preferably, the screening and guiding mechanism also includes a double-sided material discharge seat fixedly connected to the front end of the screening box, two vibration motors are fixedly installed on the upper end surface of the screening box, a dust suppression pipe is installed on the inner side of the upper end of the screening box, and a conical material guide seat is fixedly installed on the inner side of the bottom end of the screening box.

[0008] Preferably, the screw conveyor includes a conveying cylinder, a slag discharge main pipe is fixedly installed at the front end of the conveying cylinder, a plurality of slag discharge branch pipes are arranged between the conveying cylinder and the slag discharge main pipe, a second transmission motor is fixedly installed at the front end of one side of the conveying cylinder, a return pipe is fixedly installed on one side of the second transmission motor, a flushing diverter rack is fixedly installed on the upper end surface of the conveying cylinder, a third transmission motor is fixedly installed on the rear end of the conveying cylinder, and a discharge port is fixedly installed on the rear end of the lower end surface of the conveying cylinder.

[0009] Preferably, the bottom end of the conical material guide seat is inserted into the inner side of the front end of the conveying cylinder, the screening box and the conveying cylinder are connected through the conical material guide seat, the upper end of the reflux pipe passes through the screening box and is connected with the dust suppression pipe, both sides of the dust suppression pipe and the bottom end of the flushing diversion frame are provided with multiple spray heads, the slag discharge branch pipe and multiple slag discharge main pipes are connected with the conveying cylinder, the inner side of the front end of the conveying cylinder is provided with a toggle frame, the output end of the second transmission motor passes through the conveying cylinder and is fixedly connected to the toggle frame, the rotation direction of the toggle frame is counterclockwise, and the inner side of the middle part of the conveying cylinder is provided with a spiral blade, and the output end of the third transmission motor passes through the rear end of the conveying cylinder and is fixedly connected to the spiral blade.

[0010] Preferably, both sides of the screening box are slidably connected to the two sealing plates, the adjusting rod is threadedly connected to one end of the transmission plate, the sealing plate and the transmission plate slide linearly back and forth along the axis of the adjusting rod, guide grooves are provided on both sides of the vibration separation plate, and the middle part of the transmission plate passes through the screening box and is plugged into the inner side of the guide groove.

[0011] Preferably, the three flat corrugated plates are arranged linearly along the side of the mounting frame, the spacing between the three flat corrugated plates and the vibration separation plate increases from front to back along the side of the mounting frame, and the three flat corrugated plates and the vibration separation plate are fixedly connected through the mounting frame.

[0012] Preferably, the upper end of the guide seat passes through the vibration separation plate and the mounting frame, the vibration separation plate and the lifting plate are slidably connected through four guide seats, the number of the sieve holes is consistent with the number of the lifting cone blocks, a plurality of the sieve holes are installed corresponding to the lifting cone blocks, and the lifting plate is fixedly connected to a plurality of lifting cone blocks.

[0013] Preferably, the middle parts of the two follower seats penetrate the screening box and are fixedly connected to the two sides of the vibration separation plate, the follower seat is fixedly connected to the fourth transmission motor through a motor mounting seat, a U-shaped groove is provided at the bottom end of the follower seat, and the middle parts of the two sides of the jacking plate are plugged into the inner side of the U-shaped groove.

[0014] Preferably, the upper end of the transmission connecting rod is eccentrically mounted to the transmission disc, both ends of the transmission connecting rod are rotationally connected to the transmission disc and the lifting plate through pins, and the lifting plate slides linearly back and forth along the axis of the guide seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can drive the front end of the vibrating separation plate to adjust its height through the transmission plate when the two adjusting rods are rotated, and then the vibrating separation plate can swing relative to the screening box through the connecting shaft, which is convenient for controlling the screening rate of sand and gravel. The conveyor belt can stably transport the sand and gravel through multiple feeding baffles and feed them to the inner side of the screening box. The screening box can synchronously drive the vibrating separation plate to vibrate through the connecting shaft and realize the screening operation of sand and gravel through the sieve holes. The spacing between the three flattened corrugated plates and the vibrating separation plate increases from front to back along the side of the mounting frame, and then the sand and gravel above the vibrating separation plate can be gradually flattened through the three flattened corrugated plates, so as to keep the sand and gravel evenly spread on the end surface of the vibrating separation plate, thereby improving the screening efficiency of the vibrating separation plate for sand and gravel; 2. The present invention drives the upper end of the transmission connecting rod to swing eccentrically via the fourth transmission motor through the transmission disk, and then the two transmission connecting rods drive the lifting plate to slide linearly back and forth under the guiding action of the four guide seats, so that the lifting plate drives multiple lifting cone blocks to repeatedly plug into the inner side of the sieve hole and lift the sand and gravel stuck on the inner side of the sieve hole, effectively avoiding the jamming of the sand and gravel, and spirally conveying the sand and gravel along the axis of the conveying cylinder, and then the spirally conveyed sand and gravel can be flushed through the flushing diversion frame, the cleaning liquid inside the conveying cylinder is extracted through the reflux pipe, and the sand and gravel entering the screening box is sprayed through the dust suppression pipe, thereby effectively suppressing the dust on the upper end of the screening box and preliminarily cleaning the sand and gravel, thereby improving the cleaning effect of the sand and gravel and reducing the cleaning pressure of the conveying cylinder on the sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A side view of the present invention as a whole; Figure 3 A front view of the present invention as a whole; Figure 4 It is a schematic cross-sectional structure diagram of the present invention as a whole; Figure 5 It is a schematic cross-sectional structure diagram of the screening and guiding mechanism of the present invention; Figure 6 It is a schematic cross-sectional structure diagram of the screening and separation mechanism of the present invention; Figure 7 This is a schematic diagram of the installation structure of the screening and separation mechanism of the present invention; Figure 8 It is a structural schematic diagram of the screening and separation mechanism of the present invention.

[0017] In the figure: 1. feeding conveyor; 101. conveyor frame; 102. first transmission motor; 103. conveyor belt; 104. feeding baffle; 105. transmission roller; 106. leveling inclined plate; 2. screening and guiding mechanism; 201. support frame; 202. screening box; 203. double-sided material discharge seat; 204. vibration motor; 205. conical material guide seat; 206. blocking plate; 207. dust suppression pipe; 208. transmission plate; 209. adjustment rod; 3. screw conveyor; 301. conveying cylinder; 302. slag discharge main pipe; 30 3. Slag discharge branch pipe; 304. Second transmission motor; 305. Reflux pipe; 306. Flushing diverter rack; 307. Feeding port; 308. Third transmission motor; 4. Screening and separation mechanism; 401. Fourth transmission motor; 402. Vibrating separation plate; 403. Mounting frame; 404. Lifting plate; 405. Connecting shaft; 406. Flattened corrugated plate; 407. Motor mounting seat; 408. Transmission disc; 409. Transmission connecting rod; 410. Follower seat; 411. Guide seat; 412. Sieve hole; 413. Lifting cone block. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] The first transmission motor 102 (model YEJ3-112M-4), the vibration motor 204 (model JZO-50-4), the second transmission motor 304 (model YS7134) and the third transmission motor 308 (model GV50-3.7KW-60-S) mentioned in the present invention can all be purchased from the market or obtained through private customization.

[0020] See also Figures 1 to 7 , an embodiment of the present invention: a sand and gravel screening device for road construction, comprising a screening and guiding mechanism 2 and a screening and separation mechanism 4, the screening and guiding mechanism 2 comprising two support frames 201, a screening box 202 is fixedly installed on the upper ends of the two support frames 201, both sides of the screening box 202 are rotatably connected with adjusting rods 209, a transmission plate 208 is installed in the middle of the adjusting rod 209, and a blocking plate 206 is fixedly installed on the outer side of the transmission plate 208, both sides of the screening box 202 are slidably connected with the two blocking plates 206, the adjusting rod 209 is connected to one end of the transmission plate 208 by threads, the blocking plate 206 and the transmission plate 208 are linearly reciprocatingly slidable along the axis of the adjusting rod 209, when the two adjusting rods 209 are rotated, the front end of the vibration separation plate 402 can be driven to adjust the height through the transmission plate 208, and then the vibration separation plate 402 can swing relative to the screening box 202 through the connecting shaft 405, so as to control the screening rate of sand and gravel; A double-sided material discharge seat 203 is fixedly installed at the front end of the screening box 202, two vibration motors 204 are fixedly installed on the upper end surface of the screening box 202, a dust suppression pipe 207 is installed on the inner side of the upper end of the screening box 202, and a conical material guide seat 205 is fixedly installed on the inner side of the bottom end of the screening box 202. The sand and gravel entering the screening box 202 are sprayed through the dust suppression pipe 207, thereby effectively performing dust suppression operations on the upper end of the screening box 202 and preliminarily cleaning the sand and gravel, thereby improving the cleaning effect of the sand and gravel and reducing the cleaning pressure of the conveying cylinder 301 on the sand and gravel.

[0021] See also Figures 4 to 8A screening and separation mechanism 4 is installed on the inner side of the upper end of the screening and guiding mechanism 2. The screening and separation mechanism 4 includes a vibrating separation plate 402. The vibrating separation plate 402 is rotatably connected to the screening box 202 through a connecting shaft 405. Guide grooves are provided on both sides of the vibrating separation plate 402. The middle part of the transmission plate 208 passes through the screening box 202 and is plugged into the inner side of the guide groove. A mounting frame 403 is fixedly installed on the side of the upper end surface of the vibrating separation plate 402. Three flat corrugated plates 406 are installed on the inner side of the mounting frame 403. The three flat corrugated plates 406 are arranged linearly along the side of the mounting frame 403, and the spacing between the three flattened corrugated plates 406 and the vibration separation plate 402 increases from front to back along the side of the mounting frame 403. The three flattened corrugated plates 406 are fixedly connected to the vibration separation plate 402 through the mounting frame 403. The three flattened corrugated plates 406 can gradually flatten the sand and gravel above the vibration separation plate 402, so as to keep the sand and gravel evenly spread on the upper end surface of the vibration separation plate 402, thereby improving the screening efficiency of the vibration separation plate 402 for sand and gravel; The upper end surface of the vibration separation plate 402 is provided with a plurality of sieve holes 412, and a follower seat 410 is installed in the middle of both sides of the vibration separation plate 402. The middle parts of the two follower seats 410 penetrate the screening box 202 and are fixedly connected to both sides of the vibration separation plate 402. Four motor mounting seats 407 are fixedly installed on one side of the two follower seats 410, and a fourth transmission motor 401 is fixedly installed between two adjacent motor mounting seats 407. The follower seat 410 is fixedly connected to the fourth transmission motor 401 through the motor mounting seat 407. A transmission disk 408 is fixedly installed on the output end of the fourth transmission motor 401, and a transmission connecting rod 409 is rotatably connected between the transmission disk 408 and the follower seat 410. A lifting plate 404 is installed below the vibration separation plate 402. A U-shaped groove is provided at the bottom end of the follower seat 410, and the middle parts of both sides of the jacking plate 404 are plugged into the inner side of the U-shaped groove. The upper end of the transmission connecting rod 409 is eccentrically installed with the transmission disk 408, and both ends of the transmission connecting rod 409 are rotatably connected with the transmission disk 408 and the jacking plate 404 through pins. A plurality of jacking cone blocks 413 are provided on the upper end surface of the jacking plate 404, and two guide seats 411 are fixedly installed on both sides of the jacking plate 404. The jacking plate 404 slides linearly back and forth along the axis of the guide seat 411, so that the fourth transmission motor 401 drives the upper end of the transmission connecting rod 409 to swing eccentrically through the transmission disk 408, and then the two transmission connecting rods 409 drive the jacking plate 404 to slide linearly back and forth under the guiding action of the four guide seats 411; The upper end of the guide seat 411 passes through the vibration separation plate 402 and the mounting frame 403. The vibration separation plate 402 and the lifting plate 404 are slidably connected through four guide seats 411. The number of sieve holes 412 and the lifting cone blocks 413 are consistent. Multiple sieve holes 412 and the lifting cone blocks 413 are installed correspondingly. The lifting plate 404 is fixedly connected to the multiple lifting cone blocks 413, so that the lifting plate 404 drives the multiple lifting cone blocks 413 to repeatedly plug into the inner side of the sieve hole 412 and lift the sand and gravel stuck on the inner side of the sieve hole 412, thereby effectively avoiding the jam of sand and gravel.

[0022] See also Figure 1 and Figure 4 A feeding conveyor 1 is installed at the front end of the screening and guiding mechanism 2. The feeding conveyor 1 includes a conveyor frame 101. A first transmission motor 102 is fixedly installed at the front end of one side of the conveyor frame 101. A conveyor belt 103 is rotatably connected to the inner side of the conveyor frame 101. Transmission rollers 105 are installed on the inner sides of both ends of the conveyor belt 103. A plurality of feeding baffles 104 are provided on the outer surface of the conveyor belt 103. Two flattening inclined plates 106 are fixedly installed on the inner side of the upper end of the first transmission motor 102. The first transmission motor The output end of 102 passes through the conveyor frame 101 and is fixedly connected to one of the drive rollers 105. The conveyor belt 103 is rotatably connected to the conveyor frame 101 through two drive rollers 105. Two leveling inclined plates 106 are linearly arranged along the sides of the conveyor belt 103. The two obliquely installed leveling inclined plates 106 can level the sand and gravel when transported on the conveyor belt 103, thereby maintaining a stable sand and gravel conveying amount and preventing large-sized sand and gravel from entering the inner side of the screening box 202 and causing screening jams.

[0023] See also Figure 1 and Figure 2 , a screw conveyor 3 is installed at the rear end of the screening and guiding mechanism 2, and the screw conveyor 3 includes a conveying cylinder 301, the bottom end of the conical material guiding seat 205 is plugged into the inner side of the front end of the conveying cylinder 301, the screening box 202 and the conveying cylinder 301 are connected through the conical material guiding seat 205, and a second transmission motor 304 is fixedly installed at the front end of one side of the conveying cylinder 301, a toggle frame is provided on the inner side of the front end of the conveying cylinder 301, the output end of the second transmission motor 304 passes through the conveying cylinder 301 and is fixedly connected to the toggle frame, and the rotation direction of the toggle frame is counterclockwise, and a third transmission motor 308 is fixedly installed at the rear end of the conveying cylinder 301, and a spiral blade is provided on the inner side of the middle part of the conveying cylinder 301, and the output end of the third transmission motor 308 passes through the rear end of the conveying cylinder 301 and is fixedly connected to the spiral blade, and a discharge port 307 is fixedly installed at the rear end of the lower end surface of the conveying cylinder 301, and sand and gravel can be spirally conveyed along the axis of the conveying cylinder 301 through the toggle frame and the spiral blade; A slag discharge main pipe 302 is fixedly installed at the front end of the conveying cylinder 301, and a plurality of slag discharge branch pipes 303 are arranged between the conveying cylinder 301 and the slag discharge main pipe 302. The slag discharge branch pipe 303 and the plurality of slag discharge main pipes 302 are all connected with the conveying cylinder 301, and the mud and sand are discharged through the slag discharge main pipe 302 and the plurality of slag discharge branch pipes 303. A return pipe 305 is fixedly installed on one side of the second transmission motor 304. The upper end of the return pipe 305 passes through the screening box 202 and is connected with the dust suppression pipe 207. A flushing diverter rack 306 is fixedly installed on the upper end surface of the conveying cylinder 301. A plurality of spray heads are arranged on both sides of the dust suppression pipe 207 and on the bottom end of the flushing diverter rack 306. The sand and gravel conveyed in spiral form can be flushed through the flushing diverter rack 306.

[0024] When in use, when screening sand and gravel for road construction, the inclination angle of the vibration separation plate 402 is adjusted. Specifically, the adjustment rod 209 is connected to the transmission plate 208 by threads, and guide grooves are provided on both sides of the vibration separation plate 402. The middle part of the transmission plate 208 is plugged into the inner side of the guide groove, and then when the two adjustment rods 209 are rotated, the front end of the vibration separation plate 402 can be driven by the transmission plate 208 to adjust the height, and then the vibration separation plate 402 can swing relative to the screening box 202 through the connecting shaft 405, which is convenient for controlling the screening rate of sand and gravel and placing the sand and gravel on the conveyor belt 103; The power supply is turned on and the first transmission motor 102 is started, so that the first transmission motor 102 drives the conveyor belt 103 to rotate clockwise through the transmission roller 105 under the support of the conveyor frame 101, and then the conveyor belt 103 can stably convey the sand and gravel through multiple feeding baffles 104 and feed them to the inner side of the screening box 202. The sand and gravel can be flattened during transportation on the conveyor belt 103 through two obliquely installed flattening inclined plates 106, thereby maintaining the stability of the sand and gravel conveying amount and preventing large-sized sand and gravel from entering the inner side of the screening box 202 and causing screening jams.

[0025] Start the two vibration motors 204 so that the vibration motors 204 drive the screening box 202 to vibrate at the upper ends of the two support frames 201. A plurality of sieve holes 412 are provided on the upper end surface of the vibration separation plate 402, so that the screening box 202 can synchronously drive the vibration separation plate 402 to vibrate through the connecting shaft 405 and implement the screening operation of sand and gravel through the sieve holes 412. Three flattened corrugated plates 406 are fixedly installed on the inner side of the mounting frame 403, and the spacing between the three flattened corrugated plates 406 and the vibration separation plate 402 increases from front to back along the side of the mounting frame 403. Then, the three flattened corrugated plates 406 can be used to gradually flatten the sand and gravel above the vibration separation plate 402, so as to keep the sand and gravel evenly spread on the upper end surface of the vibration separation plate 402, thereby improving the screening efficiency of the vibration separation plate 402 for sand and gravel; While the vibrating separation plate 402 is screening the sand and gravel, the fourth transmission motor 401 is started, so that the fourth transmission motor 401 drives the upper end of the transmission connecting rod 409 to swing eccentrically through the transmission disk 408 under the support of the motor mounting seat 407, and then the two transmission connecting rods 409 drive the lifting plate 404 to slide linearly back and forth under the guidance of the four guide seats 411, so that the lifting plate 404 drives multiple lifting cone blocks 413 to repeatedly plug the inner side of the sieve hole 412 and lift the sand and gravel stuck in the inner side of the sieve hole 412, effectively avoiding the jamming of the sand and gravel, and the sand and gravel with a size larger than the sieve hole 412 can be discharged and collected through the double-sided unloading seat 203, and the sand and gravel that meet the size requirements are input to the inner side of the front end of the conveying cylinder 301 through the sieve hole 412 and the guidance of the conical guide seat 205; The second transmission motor 304 and the third transmission motor 308 are started, so that the second transmission motor 304 drives the toggle frame provided at the front end of the conveying cylinder 301 to rotate counterclockwise, and the third transmission motor 308 drives the spiral blade provided on the inner side of the conveying cylinder 301 to rotate, and then the sand and gravel can be spirally conveyed along the axis of the conveying cylinder 301 through the toggle frame and the spiral blade, and the bottom end of the flushing and diverting frame 306 and both sides of the discharge port 307 are provided with spray heads, and then the flushing and diverting frame 306 can be used to flush the spirally conveyed sand and gravel, and the silt can be discharged through the slag discharge main pipe 302 and the multiple slag discharge branch pipes 303; The upper end of the return pipe 305 passes through the screening box 202 and is connected to the dust suppression pipe 207, and then the cleaning liquid on the inside of the conveying cylinder 301 is extracted through the return pipe 305 and the sand and gravel entering the screening box 202 are sprayed through the dust suppression pipe 207, thereby effectively performing dust suppression operations on the upper end of the screening box 202 and performing preliminary cleaning of the sand and gravel, thereby improving the cleaning effect of the sand and gravel and reducing the cleaning pressure of the conveying cylinder 301 on the sand and gravel.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A gravel screening device for road construction, comprising a screening and guiding mechanism (2) and a screening and separating mechanism (4), characterized in that: A feeding conveyor (1) is installed at the front end of the screening material guiding mechanism (2), a screening separation mechanism (4) is installed on the inner side of the upper end of the screening material guiding mechanism (2), and a screw conveyor (3) is installed at the rear end of the screening material guiding mechanism (2), the screening material guiding mechanism (2) comprises two support frames (201), a screening box (202) is fixedly installed at the upper end of the two support frames (201), both sides of the screening box (202) are rotatably connected to adjustment rods (209), a transmission plate (208) is installed in the middle of the adjustment rod (209), and a blocking plate (206) is fixedly installed on the outer side of the transmission plate (208); The screening and separation mechanism (4) comprises a vibrating separation plate (402), the vibrating separation plate (402) being rotatably connected to the screening box (202) via a connecting shaft (405), a mounting frame (403) being fixedly mounted on the side of the upper end surface of the vibrating separation plate (402), three flat corrugated plates (406) being mounted on the inner side of the mounting frame (403), a plurality of sieve holes (412) being provided on the upper end surface of the vibrating separation plate (402), a follower seat (410) being mounted in the middle of both sides of the vibrating separation plate (402), and a fixing member (410) being fixedly mounted on one side of the two follower seats (410). Four motor mounting seats (407), a fourth transmission motor (401) is fixedly mounted between two adjacent motor mounting seats (407), a transmission disc (408) is fixedly mounted on the output end of the fourth transmission motor (401), a transmission connecting rod (409) is rotatably connected between the transmission disc (408) and a follower seat (410), a lifting plate (404) is mounted below the vibration separation plate (402), a plurality of lifting cone blocks (413) are provided on the upper end surface of the lifting plate (404), and two guide seats (411) are fixedly mounted on both sides of the lifting plate (404).

2. A sand and gravel screening device for road construction according to claim 1, characterized in that: The loading conveyor (1) comprises a conveyor frame (101), a first transmission motor (102) is fixedly mounted at the front end of one side of the conveyor frame (101), a conveyor belt (103) is rotatably connected to the inner side of the conveyor frame (101), transmission rollers (105) are mounted on the inner sides of both ends of the conveyor belt (103), a plurality of material feeding baffles (104) are arranged on the outer surface of the conveyor belt (103), two flattening inclined plates (106) are fixedly mounted on the inner side of the upper end of the first transmission motor (102), an output end of the first transmission motor (102) passes through the conveyor frame (101) and is fixedly connected to one of the transmission rollers (105), the conveyor belt (103) is rotatably connected to the conveyor frame (101) via the two transmission rollers (105), and the two flattening inclined plates (106) are linearly arranged along the side of the conveyor belt (103).

3. A sand and gravel screening device for road construction according to claim 2, characterized in that: The screening material guiding mechanism (2) further comprises a double-sided material discharge seat (203) fixedly connected to the front end of the screening box (202); two vibration motors (204) are fixedly mounted on the upper end surface of the screening box (202); a dust suppression pipe (207) is mounted on the inner side of the upper end of the screening box (202); and a conical material guiding seat (205) is fixedly mounted on the inner side of the bottom end of the screening box (202).

4. A sand and gravel screening device for road construction according to claim 3, characterized in that: The screw conveyor (3) comprises a conveying cylinder (301), a slag discharge main pipe (302) is fixedly mounted at the front end of the conveying cylinder (301), a plurality of slag discharge branch pipes (303) are arranged between the conveying cylinder (301) and the slag discharge main pipe (302), a second transmission motor (304) is fixedly mounted at the front end of one side of the conveying cylinder (301), a return pipe (305) is fixedly mounted on one side of the second transmission motor (304), a flushing and diverting frame (306) is fixedly mounted on the upper end surface of the conveying cylinder (301), a third transmission motor (308) is fixedly mounted at the rear end of the conveying cylinder (301), and a discharge port (307) is fixedly mounted at the rear end of the lower end surface of the conveying cylinder (301).

5. A sand and gravel screening device for road construction according to claim 4, characterized in that: The bottom end of the conical material guide seat (205) is plugged into the inner side of the front end of the conveying cylinder (301); the screening box (202) and the conveying cylinder (301) are connected through the conical material guide seat (205); the upper end of the return pipe (305) passes through the screening box (202) and is connected to the dust suppression pipe (207); both sides of the dust suppression pipe (207) and the bottom end of the flushing diversion frame (306) are provided with a plurality of spray heads; the slag discharge branch pipe (303) and the plurality of discharge branches (305) are connected to the dust suppression pipe (207); The slag main pipe (302) is connected to the conveying cylinder (301); a toggle frame is provided on the inner side of the front end of the conveying cylinder (301); the output end of the second transmission motor (304) passes through the conveying cylinder (301) and is fixedly connected to the toggle frame; the rotation direction of the toggle frame is counterclockwise; a spiral blade is provided on the inner side of the middle part of the conveying cylinder (301); and the output end of the third transmission motor (308) passes through the rear end of the conveying cylinder (301) and is fixedly connected to the spiral blade.

6. A sand and gravel screening device for road construction according to claim 3, characterized in that: Both sides of the screening box (202) are slidably connected to the two blocking plates (206), the adjusting rod (209) is threadedly connected to one end of the transmission plate (208), the blocking plate (206) and the transmission plate (208) slide linearly back and forth along the axis of the adjusting rod (209), both sides of the vibration separation plate (402) are provided with guide grooves, and the middle part of the transmission plate (208) passes through the screening box (202) and is plugged into the inner side of the guide groove.

7. A sand and gravel screening device for road construction according to claim 6, characterized in that: The three flattened corrugated plates (406) are linearly arranged along the side of the mounting frame (403); the spacing between the three flattened corrugated plates (406) and the vibration separation plate (402) increases from front to back along the side of the mounting frame (403); and the three flattened corrugated plates (406) and the vibration separation plate (402) are fixedly connected via the mounting frame (403).

8. A sand and gravel screening device for road construction according to claim 7, characterized in that: The upper end of the guide seat (411) passes through the vibration separation plate (402) and the mounting frame (403); the vibration separation plate (402) and the lifting plate (404) are slidably connected via four guide seats (411); the number of the sieve holes (412) and the lifting cone blocks (413) are consistent; a plurality of the sieve holes (412) and the lifting cone blocks (413) are mounted correspondingly; and the lifting plate (404) is fixedly connected to the plurality of lifting cone blocks (413).

9. A sand and gravel screening device for road construction according to claim 8, characterized in that: The middle parts of the two follower seats (410) penetrate the screening box (202) and are fixedly connected to the two sides of the vibration separation plate (402); the follower seat (410) is fixedly connected to the fourth transmission motor (401) via a motor mounting seat (407); a U-shaped groove is provided at the bottom end of the follower seat (410); and the middle parts of the two sides of the lifting plate (404) are plugged into the inner side of the U-shaped groove.

10. A sand and gravel screening device for road construction according to claim 9, characterized in that: The upper end of the transmission connecting rod (409) is eccentrically mounted to the transmission disk (408), and both ends of the transmission connecting rod (409) are rotatably connected to the transmission disk (408) and the lifting plate (404) via pins. The lifting plate (404) slides linearly back and forth along the axis of the guide seat (411).

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