Automatic feeding system of sand and gravel for concrete

Abstract

The present invention discloses an automatic feeding system for sand and gravel for concrete, which belongs to the technical field of sand and gravel feeding, and comprises a stone feeding device, the stone feeding device is used to feed the stone, the stone feeding device is provided with a sand feeding device, the sand feeding device is used to feed the sand, and the sand feeding device is provided with a mixing device, the mixing device is used to mix the sand and gravel. The present invention adopts an intermittent mechanism to control the single entry amount of the stone, and cooperates with the conveying mechanism to convey the sand, and can adjust the ratio of the sand and stone entering the mixing device, so as to adjust and control the sand and gravel ratio for concrete processing. The screening mechanism provided in the present invention can shake off the impurities such as the stone and dust which are too small in size, discharge the sand which is too large in size through the screening cylinder, and collect and process the unqualified sand and stone, which saves resources and improves the quality of the sand and gravel for concrete processing.

Description

Technical Field

[0001] The invention belongs to the technical field of sand and gravel feeding equipment, and in particular relates to an automatic sand and gravel feeding system for concrete. Background Art

[0002] Concrete is a very common building material. It is usually made of sand and stone as base materials, cement as gel material, and water in a certain proportion. In industrial production, sand and stone usually need to be stacked separately, and they need to be mixed in proportion when used, which not only causes inconvenience in transportation, but also requires weighing for proportioning, which is a great waste of manpower and material resources. The sand and stone feeding device used for concrete manufacturing in the prior art mainly uses different transmission belts to transport sand and stone to the concrete mixing bin respectively, but cannot screen sand and stone, and the ratio of sand and stone cannot be controlled, resulting in a low degree of automation in the feeding of sand and stone. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide an automatic feeding system for sand and gravel for concrete.

[0004] The technical solution adopted to solve the above technical problems is: an automatic feeding system for sand and gravel for concrete, including a stone feeding device, the stone feeding device includes a stone feeding frame, the stone feeding device is used to feed stones, the stone feeding device is provided with a sand feeding device, the sand feeding device includes a sand feeding frame and a slag frame, the slag frame is fixedly installed on the stone feeding frame, the sand feeding device is used to feed sand, the sand feeding device is provided with a mixing device, the mixing device includes a feeding frame, the feeding frame is fixedly installed on the slag frame, and the mixing device is used to mix sand and gravel.

[0005] Furthermore, the stone feeding device includes a stone feeding motor fixedly mounted on the stone feeding frame, a motor gear is fixedly mounted on the motor shaft of the stone feeding motor, a vertical slide rail is fixedly mounted on the stone feeding frame, and an intermittent mechanism and a screening mechanism are arranged on the stone feeding frame.

[0006] Furthermore, the intermittent mechanism includes a vertical slide frame slidably mounted on the vertical slide rail, a horizontal slide block slidably mounted on the vertical slide frame, a movable frame fixedly mounted on the horizontal slide block, the movable frame and the stone feeding frame are slidably mounted, a material shifting plate is slidably mounted on the movable frame, a lifting spring is arranged between the material shifting plate and the movable frame, and the movable frame is eccentrically rotated with the motor gear.

[0007] Furthermore, the screening mechanism includes a shaking frame slidably installed on the stone feeding frame, a docking block is fixedly installed on the shaking frame, a shaking gear is rotatably installed on the stone feeding frame, a plurality of shaking heads are arranged on the shaking gear, the shaking gear is meshed with the motor gear, the shaking head and the docking block are slidably installed, a shaking spring is arranged between the shaking frame and the stone feeding frame, and slopes are arranged on the shaking head and the docking block.

[0008] Put the stones into the stone feeding rack, the stone feeding motor rotates to drive the motor gear to rotate, thereby driving the shaking gear to rotate, and the shaking head continuously pushes the docking block and the shaking rack to slide along the stone feeding rack. The shaking spring is continuously compressed and released, so that the stones on it are screened through the shaking rack. Stones that are too small fall onto the slag rack, and stones of appropriate size enter the stone transmission belt.

[0009] The rotation of the motor gear will also drive the movable frame to move, thereby driving the horizontal sliding block to slide along the vertical sliding block, thereby driving the vertical sliding block to slide along the vertical slide rail, so that the movable frame always remains in a vertical state, and the movable frame first rises and then moves in the direction away from the shaking frame. At this time, the movable frame first drives the material stripping plate to rise, and then the motor gear drives the movable frame to move to the rear of the stone feed frame, and the material stripping plate reaches the rear of the stone, and then the motor gear continues to rotate, driving the movable frame to slide downward and in the direction of the shaking frame, and the material stripping plate slides along the movable frame, and the lifting spring is compressed, and the stone is pushed to the shaking frame through the material stripping plate, and so on. The lifting spring makes the lower surface of the material stripping plate always keep pressed against the stone feed frame in the lower half of the rotation of the motor gear.

[0010] Furthermore, the sand feeding device includes a sand feeding hopper fixedly mounted on the sand feeding frame, a slag collecting frame fixedly mounted on the slag frame, the slag collecting frame and the sand feeding frame are fixedly mounted, a gear shaft is rotatably mounted on the sand feeding frame, a bevel gear and a lower gear are fixedly mounted on the gear shaft, and a conveying mechanism is provided on the sand feeding frame.

[0011] Furthermore, the conveying mechanism includes a conveying shaft rotatably installed in the sand feeding frame, an upper gear is fixedly installed on the conveying shaft, a vertical transmission belt is wrapped around the upper gear and the lower gear, a screening drum and a belt gear are fixedly installed on the conveying shaft, a horizontal transmission belt is wrapped around the belt gear and the motor gear, a plurality of holes are arranged on the screening drum, a sand discharge hopper is fixedly installed on the sand feeding frame, a discharge plate is fixedly installed on the sand discharge hopper, and the screening drum is located above the sand discharge hopper.

[0012] Put the sand into the sand inlet hopper and into the sand inlet rack. The motor gear rotates through the horizontal transmission belt to drive the belt gear and the conveying shaft to rotate, thereby driving the screening drum and the upper gear to rotate. The upper gear drives the lower gear and the gear shaft to rotate through the vertical transmission belt, thereby driving the bevel gear to rotate. The conveying shaft transports the sand toward the screening drum. Sand of appropriate size will fall out of the holes in the screening drum into the sand outlet hopper and then fall onto the sand transmission belt. Sand that is too large will enter the slag collecting rack through the discharge plate.

[0013] Furthermore, the mixing device includes a discharge slope and an intermediate baffle fixedly mounted on a feed rack, a transmission rack fixedly mounted on the intermediate baffle, sand transmission wheels are rotatably mounted on the feed rack and the transmission rack respectively, a stone transmission wheel is fixedly mounted on the sand transmission wheel, a docking bevel gear is fixedly mounted on the sand transmission wheel on the feed rack, the docking bevel gear is meshed with the bevel gear, a sand transmission belt is wrapped around the sand transmission wheel, a stone transmission belt is wrapped around the stone transmission wheel, the intermediate baffle is located between the stone transmission belt and the sand transmission belt, and a stirring mechanism is arranged on the feed rack.

[0014] Furthermore, the stirring mechanism includes a mixing box fixedly mounted on the feed rack, a mixing motor fixedly mounted on the mixing box, a mixing blade fixedly mounted on the motor shaft of the mixing motor, a downward pressure slope slidably mounted on the mixing box, a downward pressure spring is arranged between the downward pressure slope and the mixing box, and a discharge port is arranged on the mixing box.

[0015] The rotation of the bevel gear will drive the docking bevel gear and the sand drive wheel to rotate, and at the same time drive the stone drive wheel to rotate, thereby driving the stone drive belt and the sand drive belt to transport the screened stone and sand to the discharge slope. The sand and stone enter the mixing box along the discharge slope and fall onto the downward pressure slope. The rotation of the mixing motor drives the mixing blades to rotate, and the sand and stone are mixed through the mixing blades. As the weight of the mixture on the downward pressure slope becomes heavier, the downward pressure slope is compressed, the downward pressure spring is compressed, and the mixed sand and gravel are discharged through the discharge port.

[0016] The beneficial effects of the present invention are as follows: (1) The present invention adopts an intermittent mechanism to control the single entry amount of stone, and cooperates with the conveying mechanism to convey the sand, which can adjust the ratio of sand and stone entering the mixing device, thereby realizing the adjustment and control of the sand and gravel ratio for concrete processing; (2) The screening mechanism provided in the present invention can shake off impurities such as stones and dust that are too small in size, discharge sand that is too large in size through the screening cylinder, and collect and process unqualified sand and stone, thereby saving resources and improving the quality of sand and gravel for concrete processing; (3) The mixing device provided in the present invention can mix the screened stone and sand, and the mixed sand and gravel are continuously discharged from the discharge port, realizing continuous sand and gravel feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 The structure of the stone feeding device of the present invention is shown in FIG. Figure 1 .

[0019] Figure 3 The structure of the stone feeding device of the present invention is shown in FIG. Figure 2 .

[0020] Figure 4 The structure of the stone feeding device of the present invention is shown in FIG. Figure 3 .

[0021] Figure 5 The structure of the sand feeding device of the present invention is shown in FIG. Figure 1 .

[0022] Figure 6 The structure of the sand feeding device of the present invention is shown in FIG. Figure 2 .

[0023] Figure 7 It is a structural schematic diagram of the conveying mechanism of the present invention.

[0024] Figure 8 The structure of the mixing device of the present invention is shown in FIG. Figure 1 .

[0025] Fig. 9 The structure of the mixing device of the present invention is shown in FIG. Figure 2 .

[0026] Fig.10 It is a structural schematic diagram of the stirring mechanism of the present invention.

[0027] Figure numerals: 101-stone feeding frame; 102-stone feeding motor; 103-motor gear; 104-shaking gear; 105-shaking head; 106-shaking frame; 107-docking block; 108-shaking spring; 109-movable frame; 110-lifting spring; 111-dumping plate; 112-horizontal slider; 113-vertical slider; 114-vertical slide rail; 201-sand feeding frame; 202-sand feeding hopper; 203-horizontal transmission belt; 204-bevel gear; 205-gear shaft; 206-belt gear; 207-upper gear; 208-lower gear; 20 9-vertical transmission belt; 210-screening drum; 211-conveying shaft; 212-sand hopper; 213-discharging plate; 214-slag collecting rack; 215-slag rack; 301-feeding rack; 302-transmission rack; 303-discharging slope; 304-sand transmission wheel; 305-middle baffle; 306-stone transmission wheel; 307-sand transmission belt; 308-stone transmission belt; 309-mixing box; 310-mixing motor; 311-mixing blades; 312-downward pressure slope; 313-downward pressure spring; 314-discharging port; 315-joining bevel gear. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] like Figure 1 As shown, an automatic feeding system for sand and gravel for concrete in this embodiment is composed of a stone feeding device, a sand feeding device and a mixing device. The stone feeding device includes a stone feeding frame 101, which is used to feed stones. The stone feeding device is provided with a sand feeding device, which includes a sand feeding frame 201 and a slag frame 215, which is fixedly mounted on the stone feeding frame 101. The sand feeding device is used to feed sand. The sand feeding device is provided with a mixing device, which includes a feeding frame 301, which is fixedly mounted on the slag frame 215, and the mixing device is used to mix sand and gravel.

[0030] like Figure 2-Figure 4 As shown, the stone feeding device includes a stone feeding motor 102 fixedly mounted on a stone feeding frame 101, a motor gear 103 is fixedly mounted on the motor shaft of the stone feeding motor 102, a vertical slide rail 114 is fixedly mounted on the stone feeding frame 101, and an intermittent mechanism and a screening mechanism are arranged on the stone feeding frame 101.

[0031] like Figure 2-Figure 4As shown, the intermittent mechanism includes a vertical slide 113 slidably mounted on a vertical slide rail 114, a horizontal slide 112 is slidably mounted on the vertical slide 113, a movable frame 109 is fixedly mounted on the horizontal slide 112, the movable frame 109 is slidably mounted with the stone feeding frame 101, a material shifting plate 111 is slidably mounted on the movable frame 109, a lifting spring 110 is arranged between the material shifting plate 111 and the movable frame 109, and the movable frame 109 is eccentrically rotated with the motor gear 103.

[0032] like Figure 2-Figure 4 As shown, the screening mechanism includes a shaking frame 106 slidably mounted on the stone feeding frame 101, a docking block 107 is fixedly mounted on the shaking frame 106, a shaking gear 104 is rotatably mounted on the stone feeding frame 101, a plurality of shaking heads 105 are arranged on the shaking gear 104, the shaking gear 104 is meshed with the motor gear 103, the shaking head 105 is slidably mounted on the docking block 107, a shaking spring 108 is arranged between the shaking frame 106 and the stone feeding frame 101, and slopes are arranged on the shaking head 105 and the docking block 107.

[0033] The stones are put into the stone feeding frame 101, and the stone feeding motor 102 rotates to drive the motor gear 103 to rotate, thereby driving the shaking gear 104 to rotate, and the shaking head 105 continuously pushes the docking block 107 and the shaking frame 106 to slide along the stone feeding frame 101, and the shaking spring 108 is continuously compressed and released, so that the stones on it are screened through the shaking frame 106. Stones that are too small fall onto the slag frame 215, and stones of appropriate size enter the stone transmission belt 308.

[0034] The rotation of the motor gear 103 will also drive the movable frame 109 to move, thereby driving the horizontal sliding block 112 to slide along the vertical sliding block 113, thereby driving the vertical sliding block 113 to slide along the vertical sliding rail 114, so that the movable frame 109 always remains in a vertical state, and the movable frame 109 first rises and then moves in the direction away from the shaking frame 106. At this time, the movable frame 109 first drives the material stripping plate 111 to rise, and then the motor gear 103 brings the movable frame 109 to move to the rear of the stone feeding frame 101, and the material stripping plate 111 arrives behind the stone. Then the motor gear 103 continues to rotate, driving the movable frame 109 downward and sliding in the direction of the shaking frame 106, and the material stripping plate 111 slides along the movable frame 109, and the lifting spring 110 is compressed, and the stone is pushed onto the shaking frame 106 through the material stripping plate 111. In this reciprocating manner, the lifting spring 110 makes the lower surface of the material stripping plate 111 always keep pressed against the stone feeding frame 101 in the lower half circle of the rotation of the motor gear 103.

[0035] like Figure 5-Figure 7As shown, the sand feeding device includes a sand feeding hopper 202 fixedly mounted on a sand feeding frame 201, a slag collecting frame 214 fixedly mounted on a slag frame 215, the slag collecting frame 214 is fixedly mounted on the sand feeding frame 201, a gear shaft 205 is rotatably mounted on the sand feeding frame 201, a bevel gear 204 and a lower gear 208 are fixedly mounted on the gear shaft 205, and a conveying mechanism is provided on the sand feeding frame 201.

[0036] like Figure 5-Figure 7 As shown, the conveying mechanism includes a conveying shaft 211 rotatably mounted in the sand feeding frame 201, an upper gear 207 is fixedly mounted on the conveying shaft 211, a vertical transmission belt 209 is wound around the upper gear 207 and the lower gear 208, a screening drum 210 and a belt gear 206 are fixedly mounted on the conveying shaft 211, a horizontal transmission belt 203 is wound around the belt gear 206 and the motor gear 103, a plurality of holes are provided on the screening drum 210, a sand discharge hopper 212 is fixedly mounted on the sand feeding frame 201, a discharge plate 213 is fixedly mounted on the sand discharge hopper 212, and the screening drum 210 is located above the sand discharge hopper 212.

[0037] The sand is put into the sand inlet hopper 202 and enters the sand inlet frame 201. The motor gear 103 rotates through the horizontal transmission belt 203 to drive the belt gear 206 and the conveying shaft 211 to rotate, thereby driving the screening drum 210 and the upper gear 207 to rotate. The upper gear 207 drives the lower gear 208 and the gear shaft 205 to rotate through the vertical transmission belt 209, thereby driving the bevel gear 204 to rotate. The conveying shaft 211 conveys the sand toward the screening drum 210. Sand of appropriate size will fall out of the holes of the screening drum 210 into the sand outlet hopper 212, and then fall onto the sand transmission belt 307. Sand that is too large will enter the slag collection rack 214 through the discharge plate 213.

[0038] like Figure 8-Figure 10 As shown, the mixing device includes a material discharge slope 303 and an intermediate baffle 305 fixedly mounted on a feed frame 301, a transmission frame 302 fixedly mounted on the intermediate baffle 305, sand transmission wheels 304 are rotatably mounted on the feed frame 301 and the transmission frame 302 respectively, a stone transmission wheel 306 is fixedly mounted on the sand transmission wheel 304, a docking bevel gear 315 is fixedly mounted on the sand transmission wheel 304 on the feed frame 301, the docking bevel gear 315 is meshed with the bevel gear 204, a sand transmission belt 307 is wound around the sand transmission wheel 304, a stone transmission belt 308 is wound around the stone transmission wheel 306, the intermediate baffle 305 is located between the stone transmission belt 308 and the sand transmission belt 307, and a stirring mechanism is arranged on the feed frame 301.

[0039] like Figure 8-Figure 10As shown, the stirring mechanism includes a mixing box 309 fixedly mounted on the feed rack 301, a mixing motor 310 fixedly mounted on the mixing box 309, a mixing blade 311 fixedly mounted on the motor shaft of the mixing motor 310, a downward pressure slope 312 slidably mounted on the mixing box 309, a downward pressure spring 313 is arranged between the downward pressure slope 312 and the mixing box 309, and a discharge port 314 is arranged on the mixing box 309.

[0040] The rotation of bevel gear 204 will drive the docking bevel gear 315 and sand drive wheel 304 to rotate, and at the same time drive the stone drive wheel 306 to rotate, thereby driving the stone drive belt 308 and the sand drive belt 307 to transport the screened stone and sand to the discharge slope 303. The sand and stone enter the mixing box 309 along the discharge slope 303 and fall onto the downward pressure slope 312. The mixing motor 310 rotates to drive the mixing blade 311 to rotate, and the sand and stone are mixed by the mixing blade 311. As the weight of the mixture on the downward pressure slope 312 becomes heavier, the downward pressure slope 312 is compressed, the downward pressure spring 313 is compressed, and the mixed sand and stone are discharged through the discharge port 314.

[0041] The working principle of this embodiment is as follows: stones are put into the stone feeding frame 101, and the stone feeding motor 102 rotates to drive the motor gear 103 to rotate, thereby driving the shaking gear 104 to rotate, and the shaking head 105 continuously pushes the docking block 107 and the shaking frame 106 to slide along the stone feeding frame 101, and the shaking spring 108 is continuously compressed and released, so that the stones on it are screened through the shaking frame 106. Stones that are too small fall onto the slag frame 215, and stones of appropriate size enter the stone transmission belt 308. The rotation of the motor gear 103 will also drive the movable frame 109 to move, thereby driving the horizontal sliding block 112 to slide along the vertical sliding block 113, thereby driving the vertical sliding block 113 to slide along the vertical sliding rail 114, so that the movable frame 109 always remains in a vertical state, and the movable frame 109 first rises and then moves in the direction away from the shaking frame 106. At this time, the movable frame 109 first drives the material stripping plate 111 to rise, and then the motor gear 103 brings the movable frame 109 to move to the rear of the stone feeding frame 101, and the material stripping plate 111 arrives behind the stone. Then the motor gear 103 continues to rotate, driving the movable frame 109 downward and sliding in the direction of the shaking frame 106, and the material stripping plate 111 slides along the movable frame 109, and the lifting spring 110 is compressed, and the stone is pushed onto the shaking frame 106 through the material stripping plate 111. In this reciprocating manner, the lifting spring 110 makes the lower surface of the material stripping plate 111 always keep pressed against the stone feeding frame 101 in the lower half circle of the rotation of the motor gear 103. The sand is put into the sand inlet hopper 202 and enters the sand inlet frame 201. The motor gear 103 rotates through the horizontal transmission belt 203 to drive the belt gear 206 and the conveying shaft 211 to rotate, thereby driving the screening drum 210 and the upper gear 207 to rotate. The upper gear 207 drives the lower gear 208 and the gear shaft 205 to rotate through the vertical transmission belt 209, thereby driving the bevel gear 204 to rotate. The conveying shaft 211 conveys the sand toward the screening drum 210. Sand of appropriate size will fall out of the holes of the screening drum 210 into the sand outlet hopper 212, and then fall onto the sand transmission belt 307. Sand that is too large will enter the slag collection rack 214 through the discharge plate 213. The rotation of bevel gear 204 will drive the docking bevel gear 315 and sand drive wheel 304 to rotate, and at the same time drive the stone drive wheel 306 to rotate, thereby driving the stone drive belt 308 and the sand drive belt 307 to transport the screened stone and sand to the discharge slope 303. The sand and stone enter the mixing box 309 along the discharge slope 303 and fall onto the downward pressure slope 312. The mixing motor 310 rotates to drive the mixing blade 311 to rotate, and the sand and stone are mixed by the mixing blade 311. As the weight of the mixture on the downward pressure slope 312 becomes heavier, the downward pressure slope 312 is compressed, the downward pressure spring 313 is compressed, and the mixed sand and stone are discharged through the discharge port 314.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An automatic feeding system for sand and gravel for concrete, comprising a stone feeding device, characterized in that: The stone feeding device comprises a stone feeding frame (101), the stone feeding device is used to feed stone materials, the stone feeding device is provided with a sand feeding device, the sand feeding device comprises a sand feeding frame (201) and a slag frame (215), the slag frame (215) is fixedly mounted on the stone feeding frame (101), the sand feeding device is used to feed sand materials, the sand feeding device is provided with a mixing device, the mixing device comprises a feeding frame (301), the feeding frame (301) is fixedly mounted on the slag frame (215), and the mixing device is used to mix sand and stone; The stone feeding device comprises a stone feeding motor (102) fixedly mounted on a stone feeding frame (101), a motor gear (103) fixedly mounted on the motor shaft of the stone feeding motor (102), a vertical slide rail (114) fixedly mounted on the stone feeding frame (101), and an intermittent mechanism and a screening mechanism are arranged on the stone feeding frame (101); The intermittent mechanism comprises a vertical slide frame (113) slidably mounted on a vertical slide rail (114), a horizontal slide block (112) slidably mounted on the vertical slide frame (113), a movable frame (109) fixedly mounted on the horizontal slide block (112), the movable frame (109) slidably mounted on the stone feeding frame (101), a material shifting plate (111) slidably mounted on the movable frame (109), a lifting spring (110) is provided between the material shifting plate (111) and the movable frame (109), and the movable frame (109) is eccentrically rotatably mounted on the motor gear (103); The screening mechanism comprises a shaking frame (106) slidably mounted on the stone feeding frame (101), a docking block (107) being fixedly mounted on the shaking frame (106), a shaking gear (104) being rotatably mounted on the stone feeding frame (101), a plurality of shaking heads (105) being arranged on the shaking gear (104), the shaking gear (104) being meshed with a motor gear (103), the shaking heads (105) being slidably mounted on the docking block (107), a shaking spring (108) being arranged between the shaking frame (106) and the stone feeding frame (101), and slopes being arranged on the shaking heads (105) and the docking block (107); The sand feeding device comprises a sand feeding hopper (202) fixedly mounted on a sand feeding frame (201); a slag collecting frame (214) fixedly mounted on a slag frame (215); the slag collecting frame (214) is fixedly mounted on the sand feeding frame (201); a gear shaft (205) is rotatably mounted on the sand feeding frame (201); a bevel gear (204) and a lower gear (208) are fixedly mounted on the gear shaft (205); and a conveying mechanism is provided on the sand feeding frame (201); The mixing device comprises a material discharge slope (303) and an intermediate baffle (305) fixedly mounted on a feed frame (301); a transmission frame (302) is fixedly mounted on the intermediate baffle (305); sand material transmission wheels (304) are rotatably mounted on the feed frame (301) and the transmission frame (302); a stone material transmission wheel (306) is fixedly mounted on the sand material transmission wheel (304); a docking bevel gear (315) is fixedly mounted on the sand material transmission wheel (304) on the feed frame (301); the docking bevel gear (315) is meshed with the bevel gear (204); a sand material transmission belt (307) is wound around the sand material transmission wheel (304); a stone material transmission belt (308) is wound around the stone material transmission wheel (306); the intermediate baffle (305) is located between the stone material transmission belt (308) and the sand material transmission belt (307); and a stirring mechanism is arranged on the feed frame (301); The stirring mechanism comprises a mixing box (309) fixedly mounted on a feeding frame (301), a mixing motor (310) fixedly mounted on the mixing box (309), a mixing blade (311) fixedly mounted on the motor shaft of the mixing motor (310), a downward pressure slope (312) slidably mounted on the mixing box (309), a downward pressure spring (313) is provided between the downward pressure slope (312) and the mixing box (309), and a material discharge port (314) is provided on the mixing box (309).

2. The automatic feeding system for concrete sand and gravel according to claim 1 is characterized by: The conveying mechanism comprises a conveying shaft (211) rotatably mounted in a sand feeding frame (201); an upper gear (207) is fixedly mounted on the conveying shaft (211); a vertical transmission belt (209) is wound around the upper gear (207) and a lower gear (208); a screening cylinder (210) and a belt gear (206) are fixedly mounted on the conveying shaft (211); a horizontal transmission belt (203) is wound around the belt gear (206) and a motor gear (103); a plurality of holes are arranged on the screening cylinder (210); a sand discharge hopper (212) is fixedly mounted on the sand feeding frame (201); a discharge plate (213) is fixedly mounted on the sand discharge hopper (212); and the screening cylinder (210) is located above the sand discharge hopper (212).

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