Quantitative feeding device for building construction

Abstract

The invention relates to the technical field of building construction, and discloses a quantitative feeding device for building construction, which comprises a conveying belt, supporting frames are rotatably connected to the two sides of the conveying belt, supporting seats are fixedly connected to the lower surfaces of the supporting frames, and a dustproof discharging box is fixedly connected to the rear side surfaces of the supporting frames. According to the quantitative material receiving device, after an electric telescopic rod receives a signal, the electric telescopic rod is started and pushes a discharging baffle to turn over, so that materials in a quantitative material receiving frame stably fall on the discharging baffle, and the situation that the materials are affected by impact force to be broken during discharging is prevented; the two sides of the conveying belt are blocked by the triangular protruding blocks, materials are prevented from falling off from the two sides of the conveying belt, the conveying safety of the materials is improved, the materials can slide onto the conveying belt more quickly after the discharging baffle vibrates, and the conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a quantitative feeding device for building construction. Background Art

[0002] A quantitative feeding device is a mechanical device for continuous weighing and quantitative conveying of solid bulk materials. It is often used for material conveying in construction. The existing quantitative conveying technology cannot buffer the materials during the process of unloading them from the quantitative container, which easily leads to material breakage.

[0003] The patent number CN113443341B discloses a quantitative feeding device for construction. The material feeding device of the patent is fixedly arranged above the fixed frame, and the material feeding device is used to store and quantitatively output the construction materials; the material transportation device, the material transportation device is arranged below the fixed frame, and one end of the material transportation device is arranged below the output end of the material feeding device, and the material transportation device is used to transport the construction materials quantitatively output from the material feeding device; it is characterized in that the material feeding device includes: a temporary material storage box and a quantitative material output box. The present invention enables the quantitative output of construction materials to the material transportation device through the cooperation of the quantitative material output box and the temporary material storage box. The material transportation device stably transports the quantitative construction materials to the target point, and can efficiently and error-freely carry out the quantitative feeding of construction materials. Although the patent solves the above problems, it still has the problem that it cannot buffer the materials when they fall, which easily leads to the problem of material crushing. Therefore, a quantitative feeding device for construction is proposed to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a quantitative feeding device for construction in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a quantitative feeding device for construction, comprising a conveyor belt, support frames are rotatably connected to both sides of the conveyor belt, a support seat is fixedly connected to the lower surface of the support frame, a dust-proof unloading box is fixedly connected to the rear side of the support frame, a connecting seat is fixedly connected to the upper surface of the support frame, a partition is fixedly connected to the side where the two connecting seats are close to each other, a slag screening device for separating debris and materials is arranged above the conveyor belt, and a slag screening device for preventing excess material from being collected is arranged above the conveyor belt. The material enters the quantitative material receiving frame and the material unloading protection device, the partition includes a top plate, a quantitative material receiving frame, a discharge baffle, and an electric telescopic rod. The top plate is fixedly connected to the top of the partition, the quantitative material receiving frame is fixedly connected to the lower surface of the top plate, the discharge baffle is hinged on the side of the partition close to the quantitative material receiving frame, and the electric telescopic rod is hinged on both sides of the inner wall of the quantitative material receiving frame. The partition also includes a slide rail, a triangular protrusion, a connecting rod, and a roller. The slide rail is fixedly connected to the upper surface of the discharge baffle, the triangular protrusion is fixedly connected to both sides of the outer surface of the conveyor belt, and the connecting rod is fixedly connected The roller is connected to both sides of the unloading baffle, and is rotatably connected to the circumferential surface of the connecting rod. A weighing sensor is arranged at the bottom of the quantitative material receiving frame, and the circumferential surface of the roller and the outer surface of the triangular protrusion are in contact with each other. The bottom end of the electric telescopic rod is slidably connected through a slider and the inner surface of the slide rail. A discharge trough is arranged on the front side of the quantitative material receiving frame, and the material is poured into the quantitative material receiving frame. The weighing sensor in the quantitative material receiving frame weighs the material. When the weight of the material reaches the set standard, the weighing sensor transmits a signal to the electric telescopic rod, and the electric telescopic rod starts and pushes after receiving the signal. The unloading baffle is flipped over, so that the material in the quantitative receiving frame falls smoothly on the unloading baffle, and then the material slides from the inclined surface of the unloading baffle to the conveyor belt. At this time, the conveyor belt is started, and the conveyor belt transfers the material to the dust-proof unloading box to complete the quantitative loading. While the conveyor belt is running, it drives the triangular protrusion to move. The triangular protrusion blocks both sides of the conveyor belt, and when the triangular protrusion moves, it drives the roller up and down through the concave and convex surface. The roller reduces the resistance between the triangular protrusion and the triangular protrusion by rolling, and then drives the connecting rod to rise and fall quickly, and the connecting rod drives the unloading baffle to rise and fall quickly to produce vibration.

[0006] Preferably, the slag screening device includes a shield, a spring sheet, a screening mesh plate, and a hinge rod, the shield plate is fixedly connected to the top of the quantitative material receiving frame, the spring sheet is fixedly connected to the front side of the inner wall of the quantitative material receiving frame, the screening mesh plate is fixedly connected to the rear end of the spring sheet, and the hinge rod is fixedly connected to the two sides of the inner wall of the quantitative material receiving frame. The slag screening device also includes a slag baffle, a connecting shaft, a slide groove transmission rod, and a pull rod. The slag baffle is hinged on the front side of the quantitative material receiving frame, the connecting shaft is fixedly connected to the two sides of the slag baffle, the slide groove transmission rod is fixedly connected to the circumferential surface of the connecting shaft, the pull rod is hinged to the upper surface of the unloading baffle, the bottom end of the screening mesh plate is hinged to the circumferential surface of the hinge rod, the pull rod is slidably connected to the inner surface of the slide groove transmission rod through the sliding shaft, and the slag baffle and the quantitative material receiving frame are hinged at a torsion bar. Spring, the top of the screening mesh plate and the lower surface of the baffle are in contact with each other, and in the process of pouring the material into the quantitative receiving frame, the debris mixed in the material such as stone falls from the screening mesh plate to the interlayer between the quantitative receiving frame and the screening mesh plate through the inclined surface of the screening mesh plate, and the gravity of the material when it descends presses on the screening mesh plate to squeeze the spring piece, and the elastic force of the spring piece drives the screening mesh plate to rotate and rebound along the axis of the hinge rod to generate vibration. After the screening of the material and the debris is completed, the debris baffle can be lifted to remove the debris from the quantitative receiving frame to prevent the accumulation of debris. After the electric telescopic rod pushes the unloading baffle to flip, the unloading baffle drives the pull rod to move backward, and the pull rod pulls the slide slot transmission rod through the sliding shaft to rotate backward along the axis of the connecting shaft, thereby driving the connecting shaft to rotate counterclockwise, and the connecting shaft drives the debris baffle to rotate counterclockwise to open.

[0007] The U-shaped transmission rod is slidably connected to the upper surface of the shield plate, and the clamping shaft is fixedly connected to the upper surface of the sliding plate. The U-shaped transmission rod is fixedly connected to the upper surface of the sliding plate, and the blanking guard device also includes an L-shaped clamping block, a positioning hole, a clamping slot block, and a positioning slide lock. The L-shaped clamping block is fixedly connected to one end of the lower surface of the sliding plate close to the top plate, and the positioning hole is opened in the inner side of the L-shaped clamping block. The slot block is fixedly connected to one end of the lower surface of the top plate close to the sliding plate, and the positioning slide lock is slidably connected to the inner surface of the slot block. The two sides of the sliding plate and the slide slot clamping plate contact each other, the clamping shaft is slidably connected to the inner surface of the slide slot clamping plate, the clamping shaft is slidably connected to the inner surface of the U-shaped transmission rod, and a positioning slide lock is arranged between the positioning slide lock and the inner surface of the slot block. When the material is unloaded, the sliding plate is pushed to close the top of the quantitative material receiving frame. When the slide slot transmission rod rotates backward along the connecting shaft axis, it drives the U-shaped transmission rod to rotate and move backward to stir, thereby shifting the card shaft to move backward in the slide slot card plate. When the card shaft moves backward, it drives the sliding plate to move backward and close the top of the quantitative material receiving frame, so that the sliding plate automatically closes the quantitative material receiving frame during unloading. When the sliding plate slides backward, it drives the L-shaped card block to move backward. During the backward movement of the L-shaped card block, its rear inclined surface contacts the arc surface of the positioning slide lock, thereby pushing the positioning slide lock to retract into the card slot block, and then the L-shaped card block continues to move backward. When the positioning hole opened on the L-shaped card block is aligned with the positioning slide lock, the spring arranged between the positioning slide lock and the inner wall of the card slot block pushes the positioning slide lock out and inserts it into the positioning hole to lock the L-shaped card block, and then locks the sliding plate.

[0008] The present invention adopts the above technical solution, which can bring the following beneficial effects: 1. The quantitative feeding device for construction, the electric telescopic rod starts after receiving the signal and pushes the unloading baffle to flip, so that the material in the quantitative receiving frame falls smoothly on the unloading baffle, preventing the material from being broken by the impact force during unloading, improving the unloading safety, the triangular protrusions block both sides of the conveyor belt to prevent the material from falling from both sides of the conveyor belt, improving the transportation safety of the material, and the unloading baffle can make the material slide onto the conveyor belt more quickly after vibrating, improving the transportation efficiency.

[0009] 2. In the quantitative feeding device for construction, the debris falls from the screening mesh plate through the inclined surface of the screening mesh plate to the interlayer between the quantitative receiving frame and the screening mesh plate, so as to separate the debris from the material, prevent the material from being mixed with too much debris and affecting the use, and prevent the debris from falling into the conveyor belt during transportation and causing the conveyor belt to get stuck or damaged. The elastic force of the shrapnel drives the screening mesh plate to rotate and rebound along the axis of the hinge rod, thereby generating vibration, which improves the efficiency of debris screening, and the connecting shaft drives the debris baffle to rotate counterclockwise to open, which improves the convenience of using the device.

[0010] 3. The quantitative feeding device for construction use a sliding plate to close the top of the quantitative material receiving frame to prevent excess material from entering the quantitative material receiving frame, thereby improving the quantitative accuracy. During unloading, the sliding plate automatically closes the quantitative material receiving frame, thereby improving the ease of use. The positioning slide lock is inserted into the positioning hole to lock the L-shaped block, and then locks the sliding plate, thereby improving the stability of the sliding plate, preventing the sliding plate from deviating and causing excess material to enter the quantitative material receiving frame, thereby further improving the quantitative accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional overall structure of the present invention; Figure 2 It is a schematic diagram of the front side cross-sectional three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of the front side cross-section of the three-dimensional structure of the quantitative material receiving frame of the present invention; Figure 4 For the present invention Figure 2 A is a schematic diagram of the enlarged structure of the middle part; Figure 5 It is a schematic diagram of the front side cross-sectional three-dimensional structure of the slag screening device of the present invention; Figure 6 It is a schematic diagram of the front side stereoscopic structure of the slag baffle of the present invention; Figure 7 It is a schematic diagram of the front side stereoscopic structure of the material blanking protection device of the present invention; Figure 8 It is a schematic diagram of the side and bottom cross-sectional three-dimensional structure of the material unloading protection device of the present invention.

[0012] In the figure: 1. conveyor belt; 2. support frame; 3. support seat; 4. dust-proof unloading box; 5. connecting seat; 6. partition; 61. top plate; 62. quantitative material receiving frame; 63. unloading baffle; 64. electric telescopic rod; 65. slide rail; 66. triangular protrusion; 67. connecting rod; 68. roller; 7. slag screening device; 71. shield plate; 72. spring; 73. screening mesh plate; 74. hinge rod; 75. slag baffle; 76. connecting shaft; 77. slide chute transmission rod; 78. pull rod; 8. unloading protection device; 81. slide chute clamping plate; 82. sliding plate; 83. clamping shaft; 84. U-shaped transmission rod; 85. L-shaped clamping block; 86. positioning hole; 87. clamping slot block; 88. positioning slide lock. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1-Figure 8 , one embodiment of the present invention is: a quantitative loading device for construction, comprising a conveyor belt 1, both sides of the conveyor belt 1 are rotatably connected with a support frame 2, the lower surface of the support frame 2 is fixedly connected with a support seat 3, the rear side of the support frame 2 is fixedly connected with a dust-proof unloading box 4, the upper surface of the support frame 2 is fixedly connected with a connecting seat 5, and the side where the two connecting seats 5 are close to each other is fixedly connected with a partition 6, a slag screening device 7 for separating debris and materials is arranged above the conveyor belt 1, and a unloading protection device 8 for preventing excess material from entering a quantitative receiving frame 62 is arranged above the conveyor belt 1, and the electric telescopic rod 64 is started after receiving a signal and pushes the unloading baffle 63 to flip, so that the material in the quantitative receiving frame 62 falls smoothly on the unloading baffle 63, preventing the material from being broken by the impact force during unloading, thereby improving the unloading safety, and the partition 6 comprises a top plate 61, a quantitative receiving frame 62, a unloading baffle 63, and an electric telescopic rod 64, the top plate 61 is fixedly connected to the top of the partition 6, and the quantitative receiving frame 62 is fixedly connected On the lower surface of the top plate 61, the unloading baffle 63 is hinged on one side of the partition 6 close to the quantitative material receiving frame 62, and the electric telescopic rod 64 is hinged on both sides of the inner wall of the quantitative material receiving frame 62. The partition 6 also includes a slide rail 65, a triangular protrusion 66, a connecting rod 67, and a roller 68. The slide rail 65 is fixedly connected to the upper surface of the unloading baffle 63, the triangular protrusion 66 is fixedly connected to both sides of the outer surface of the conveyor belt 1, the connecting rod 67 is fixedly connected to both sides of the unloading baffle 63, and the roller 68 is rotatably connected to the circumferential surface of the connecting rod 67. A weighing sensor is provided at the bottom of the quantitative material receiving frame 62, the circumferential surface of the roller 68 and the outer surface of the triangular protrusion 66 are in contact with each other, the bottom end of the electric telescopic rod 64 is slidably connected through a slider and the inner surface of the slide rail 65, and a discharge trough is provided on the front side of the quantitative material receiving frame 62. The triangular protrusion 66 blocks both sides of the conveyor belt 1 to prevent the material from falling from both sides of the conveyor belt 1, thereby improving the transportation safety of the material. After the unloading baffle 63 vibrates, the material can slide onto the conveyor belt 1 more quickly, thereby improving the transportation efficiency.

[0015] Working principle: Pour the material into the quantitative receiving frame 62, and the weighing sensor in the quantitative receiving frame 62 weighs the material. When the weight of the material reaches the set standard, the weighing sensor transmits a signal to the electric telescopic rod 64. After receiving the signal, the electric telescopic rod 64 starts and pushes the unloading baffle 63 to flip, so that the material in the quantitative receiving frame 62 falls smoothly on the unloading baffle 63, preventing the material from being broken by the impact force during unloading, thereby improving the safety of unloading. Then the material slides from the inclined surface of the unloading baffle 63 to the conveyor belt 1, and the conveyor belt 1 is started at this time, and the conveyor belt 1 conveys the material to the dust-proof unloading box 4, quantitative loading is completed, and the conveyor belt 1 drives the triangular protrusion 66 to move while the conveyor belt 1 is running. The triangular protrusion 66 blocks the two sides of the conveyor belt 1 to prevent the material from falling from the two sides of the conveyor belt 1, thereby improving the transportation safety of the material. When the triangular protrusion 66 moves, it drives the roller 68 to rise and fall through the concave and convex surface. The roller 68 reduces the resistance between the triangular protrusion 66 and the triangular protrusion 66 by rolling, thereby driving the connecting rod 67 to rise and fall quickly. The connecting rod 67 then drives the discharge baffle 63 to rise and fall quickly to generate vibration. After the discharge baffle 63 generates vibration, the material can slide onto the conveyor belt 1 more quickly, thereby improving the transportation efficiency.

[0016] See also Figure 1-Figure 8 , on the basis of the above embodiment, in another embodiment of the present invention, the slag screening device 7 includes a shielding plate 71, a spring piece 72, a screening mesh plate 73, and a hinge rod 74. The shielding plate 71 is fixedly connected to the top of the quantitative material receiving frame 62, the spring piece 72 is fixedly connected to the front side of the inner wall of the quantitative material receiving frame 62, the screening mesh plate 73 is fixedly connected to the rear end of the spring piece 72, and the hinge rod 74 is fixedly connected to both sides of the inner wall of the quantitative material receiving frame 62. The slag falls from the screening mesh plate 73 to the interlayer between the quantitative material receiving frame 62 and the screening mesh plate 73 through the inclined surface of the screening mesh plate 73 to achieve the separation of the slag and the material, so as to prevent the material from being mixed with too much slag and affecting the use, and also prevent the slag from falling into the conveyor belt 1 during the conveying process, causing the conveyor belt 1 to be stuck or damaged. The slag screening device 7 also includes a slag baffle 75, a connecting rod 74, and a connecting rod 75. The cam 78 is engaged with the locking cam 74 and the locking cam 76 is engaged with the locking cam 78. When the cam 78 is engaged, the locking cam 78 is engaged with the locking cam 76 and the locking cam 76 is engaged with the locking cam 76.

[0017] Working principle: When pouring materials into the quantitative material receiving frame 62, the debris mixed in the materials such as stones will fall from the screening mesh plate 73 to the interlayer between the quantitative material receiving frame 62 and the screening mesh plate 73 through the inclined surface of the screening mesh plate 73, so as to separate the debris from the materials, prevent the excessive debris mixed in the materials from affecting the use, and prevent the debris from falling into the conveyor belt 1 during the conveying process to cause the conveyor belt 1 to jam or be damaged. The gravity of the material when it descends presses on the screening mesh plate 73, so that the screening mesh plate 73 squeezes the spring sheet 72, and the elastic force of the spring sheet 72 drives the screening mesh plate 73 rotates and rebounds along the axis of the hinge rod 74 to generate vibration, which improves the slag screening efficiency. After the screening of the material and the slag is completed, the slag baffle 75 can be lifted to remove the slag from the quantitative receiving frame 62 to prevent the accumulation of slag. After the electric telescopic rod 64 pushes the unloading baffle 63 to flip, the unloading baffle 63 drives the pull rod 78 to move backward. The pull rod 78 pulls the slide slot transmission rod 77 through the sliding shaft to rotate backward along the axis of the connecting shaft 76, thereby driving the connecting shaft 76 to rotate counterclockwise. The connecting shaft 76 then drives the slag baffle 75 to rotate counterclockwise to open, thereby improving the convenience of using the device.

[0018] See also Figure 1-Figure 8 On the basis of the above-mentioned embodiment, in another embodiment of the present invention, the material unloading protection device 8 includes a slide plate 81, a sliding plate 82, a card shaft 83, and a U-shaped transmission rod 84. The slide plate 81 is fixedly connected to both sides of the top of the quantitative material receiving frame 62, and the sliding plate 82 is slidably connected to the upper surface of the shielding plate 71. The card shaft 83 is fixedly connected to both sides of the sliding plate 82. The U-shaped transmission rod 84 is fixedly connected to the upper surface of the slide plate 77. The sliding plate 82 closes the top of the quantitative material receiving frame 62 to prevent excess material from entering the quantitative material receiving frame 62, thereby improving the quantitative accuracy. When unloading, the sliding plate 82 automatically closes the quantitative material receiving frame 62, thereby improving the convenience of use. The material unloading protection device 8 also includes an L-shaped card block 85, a positioning hole 86, a card slot block 87, and a positioning slide lock 88. The L-shaped card block 85 is fixedly connected to the bottom of the sliding plate 82 The surface is close to one end of the top plate 61, and the positioning hole 86 is opened on the inner side of the L-shaped block 85. The slot block 87 is fixedly connected to one end of the lower surface of the top plate 61 close to the sliding plate 82. The positioning slide lock 88 is slidably connected to the inner surface of the slot block 87. The two sides of the sliding plate 82 are in contact with the slide slot card plate 81. The card shaft 83 is slidably connected to the inner surface of the slide slot card plate 81. The card shaft 83 is slidably connected to the inner surface of the U-shaped transmission rod 84. A spring is arranged between the positioning slide lock 88 and the inner surface of the slot block 87. The circumferential surface of the positioning slide lock 88 and the inner surface of the positioning hole 86 are in contact with each other. The positioning slide lock 88 is inserted into the positioning hole 86 to lock the L-shaped block 85, and then locks the sliding plate 82, thereby improving the stability of the sliding plate 82 and preventing the sliding plate 82 from deviating and causing excess material to enter the quantitative receiving frame 62, thereby further improving the quantitative accuracy.

[0019] Working principle: When the material is unloaded, the sliding plate 82 is pushed to close the top of the quantitative material receiving frame 62 to prevent excess material from entering the quantitative material receiving frame 62, thereby improving the quantitative accuracy. When the chute transmission rod 77 rotates backward along the axis of the connecting shaft 76, it drives the U-shaped transmission rod 84 to rotate and move backward to stir, thereby shifting the card shaft 83 to move backward in the chute card plate 81. When the card shaft 83 moves backward, it drives the sliding plate 82 to move backward and close the top of the quantitative material receiving frame 62, so that the sliding plate 82 automatically closes the quantitative material receiving frame 62 during unloading, thereby improving the convenience of use. When the sliding plate 82 slides backward, it drives the L-shaped card block 85 to move backward. When the L-shaped block 85 moves backward, its rear inclined surface contacts the arc surface of the positioning slide lock 88, thereby pushing the positioning slide lock 88 to retract into the slot block 87, and then the L-shaped block 85 continues to move backward. When the positioning hole 86 opened on the L-shaped block 85 is aligned with the positioning slide lock 88, the spring arranged between the positioning slide lock 88 and the inner wall of the slot block 87 pushes the positioning slide lock 88 out and inserts it into the positioning hole 86 to lock the L-shaped block 85, and then locks the sliding plate 82, thereby improving the stability of the sliding plate 82, preventing the sliding plate 82 from deviating and causing excess material to enter the quantitative receiving frame 62, and further improving the quantitative accuracy.

[0020] The present invention provides a quantitative feeding device for construction. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A quantitative feeding device for construction, comprising a conveyor belt (1), characterized in that: The two sides of the conveyor belt (1) are rotatably connected to support frames (2), the lower surface of the support frame (2) is fixedly connected to a support seat (3), the rear side of the support frame (2) is fixedly connected to a dust-proof unloading box (4), the upper surface of the support frame (2) is fixedly connected to a connecting seat (5), and a partition plate (6) is fixedly connected to the side where the two connecting seats (5) are close to each other; The partition (6) comprises a top plate (61), a quantitative material receiving frame (62), a discharge baffle (63), and an electric telescopic rod (64); the top plate (61) is fixedly connected to the top of the partition (6); the quantitative material receiving frame (62) is fixedly connected to the lower surface of the top plate (61); the discharge baffle (63) is hinged to a side of the partition (6) close to the quantitative material receiving frame (62); and the electric telescopic rod (64) is hinged to both sides of the inner wall of the quantitative material receiving frame (62); A slag screening device (7) for separating debris and material is arranged above the conveyor belt (1), and a material discharge protection device (8) for preventing excess material from entering the quantitative material receiving frame (62) is arranged above the conveyor belt (1).

2. A quantitative feeding device for construction according to claim 1, characterized in that: The partition (6) further comprises a slide rail (65), a triangular protrusion (66), a connecting rod (67), and a roller (68); the slide rail (65) is fixedly connected to the upper surface of the discharge baffle (63); the triangular protrusion (66) is fixedly connected to both sides of the outer surface of the conveyor belt (1); the connecting rod (67) is fixedly connected to both sides of the discharge baffle (63); and the roller (68) is rotatably connected to the circumferential surface of the connecting rod (67).

3. A quantitative feeding device for construction according to claim 2, characterized in that: A weighing sensor is provided at the bottom of the quantitative material receiving frame (62), the circumferential surface of the roller (68) and the outer surface of the triangular protrusion (66) are in contact with each other, the bottom end of the electric telescopic rod (64) is slidably connected to the inner surface of the slide rail (65) via a slider, and a discharge groove is provided on the front side of the quantitative material receiving frame (62).

4. A quantitative feeding device for construction according to claim 3, characterized in that: The slag screening device (7) comprises a shield (71), a spring sheet (72), a screening mesh plate (73), and a hinge rod (74); the shield (71) is fixedly connected to the top of a quantitative material receiving frame (62); the spring sheet (72) is fixedly connected to the front side of the inner wall of the quantitative material receiving frame (62); the screening mesh plate (73) is fixedly connected to the rear end of the spring sheet (72); and the hinge rod (74) is fixedly connected to both sides of the inner wall of the quantitative material receiving frame (62).

5. A quantitative feeding device for construction according to claim 4, characterized in that: The slag screening device (7) also includes a slag baffle (75), a connecting shaft (76), a chute transmission rod (77), and a pull rod (78); the slag baffle (75) is hinged on the front side of the quantitative material receiving frame (62); the connecting shaft (76) is fixedly connected to both sides of the slag baffle (75); the chute transmission rod (77) is fixedly connected to the circumferential surface of the connecting shaft (76); and the pull rod (78) is hinged on the upper surface of the discharge baffle (63).

6. A quantitative feeding device for construction according to claim 5, characterized in that: The bottom end of the screening mesh plate (73) is hinged to the circumferential surface of the hinge rod (74), and the pull rod (78) is slidably connected to the inner surface of the sliding shaft and the sliding groove transmission rod (77).

7. A quantitative feeding device for construction according to claim 6, characterized in that: A torsion spring is provided at the hinged joint between the slag baffle plate (75) and the quantitative material receiving frame (62), and the top end of the screening mesh plate (73) and the lower surface of the shield plate (71) are in contact with each other.

8. A quantitative feeding device for construction according to claim 7, characterized in that: The material unloading protection device (8) comprises a chute card plate (81), a sliding plate (82), a card shaft (83), and a U-shaped transmission rod (84); the chute card plate (81) is fixedly connected to both sides of the top of the quantitative material receiving frame (62); the sliding plate (82) is slidably connected to the upper surface of the shielding plate (71); the card shaft (83) is fixedly connected to both sides of the sliding plate (82); and the U-shaped transmission rod (84) is fixedly connected to the upper surface of the chute transmission rod (77).

9. A quantitative feeding device for construction according to claim 8, characterized in that: The material unloading protection device (8) further comprises an L-shaped card block (85), a positioning hole (86), a card slot block (87), and a positioning slide lock (88); the L-shaped card block (85) is fixedly connected to one end of the lower surface of the sliding plate (82) close to the top plate (61); the positioning hole (86) is arranged on the inner side of the L-shaped card block (85); the card slot block (87) is fixedly connected to one end of the lower surface of the top plate (61) close to the sliding plate (82); and the positioning slide lock (88) is slidably connected to the inner surface of the card slot block (87).

10. A quantitative feeding device for construction according to claim 9, characterized in that: Both sides of the sliding plate (82) are in contact with the slide slot clamping plate (81), the clamping shaft (83) is slidably connected to the inner surface of the slide slot clamping plate (81), the clamping shaft (83) is slidably connected to the inner surface of the U-shaped transmission rod (84), a spring is provided between the positioning slide lock (88) and the inner surface of the clamping slot block (87), and the circumferential surface of the positioning slide lock (88) and the inner surface of the positioning hole (86) are in contact with each other.

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