A method for backfilling a subgrade with liquid composite subgrade soil and a crushing and mixing device

Abstract

The application relates to a roadbed backfilling method of liquid composite roadbed soil and a crushing and mixing device, which comprises the following steps: leveling a base: cleaning sundries of the base and flattening; preparing liquid composite roadbed soil: sending slag into the crushing and mixing device to produce the liquid composite roadbed soil; layer pouring: pouring the liquid composite roadbed soil into the roadbed from bottom to top for multiple times, tamping after each layer of the liquid composite roadbed soil is poured, and then raking the tamped liquid composite roadbed soil; and scraping treatment: performing line leveling according to the thickness required by the roadbed, removing the liquid composite roadbed soil higher than the line, and supplementing and tamping the liquid composite roadbed soil lower than the line. The application has the effect that the roadbed can conveniently support the road.

Description

Technical Field

[0001] This application relates to the field of road construction, and in particular to a method for backfilling a liquid composite subgrade soil and a crushing and mixing device. Background Technology

[0002] Roadbed backfilling typically employs layered pouring. Layered pouring involves dividing the excavation pit into multiple layers based on its depth. Construction workers then pour the roadbed soil layer by layer into the pit from bottom to top, thus forming the roadbed. Roads are then laid on the roadbed, connecting it to the ground surface and reducing the likelihood of road settlement.

[0003] The two adjacent layers of subgrade soil inside the foundation pit are poured one after the other. After the subgrade soil solidifies, drying shrinkage may occur, which may cause cracks between the two adjacent layers of subgrade soil, thereby reducing the roadbed's support effect on the road. Summary of the Invention

[0004] To facilitate the proper support of the roadbed for the road, this application provides a method for backfilling a liquid composite roadbed soil and a crushing and mixing device.

[0005] This application provides a method for backfilling a liquid composite subgrade soil and a crushing and mixing device, which adopts the following technical solution:

[0006] A method for backfilling a roadbed with liquid composite subgrade soil, comprising the following steps:

[0007] Leveling the substrate: Clean the substrate of debris and flatten it;

[0008] Preparation of liquid composite subgrade soil: The slag and soil are fed into a crushing and mixing device to produce liquid composite subgrade soil;

[0009] Layered pouring: Liquid composite subgrade soil is poured into the subgrade in multiple layers from bottom to top. After each layer of liquid composite subgrade soil is poured, it is compacted. Then the compacted liquid composite subgrade soil is leveled.

[0010] Leveling treatment: Based on the required backfill thickness of the roadbed, use a string line to level the soil, remove the liquid composite roadbed soil that is higher than the string line, and replenish and compact the liquid composite roadbed soil that is lower than the string line.

[0011] By adopting the above technical solution, each layer of liquid composite subgrade soil is compacted after laying, thereby reducing the occurrence of drying shrinkage after solidification. Simultaneously, each layer of liquid composite subgrade soil is leveled after laying, increasing the surface roughness of each layer and further reducing the likelihood of cracks caused by drying shrinkage between adjacent layers, thus ensuring the subgrade provides good support for the road. The liquid composite subgrade soil is made from slag, thus contributing to energy conservation and environmental protection.

[0012] Optionally, the liquid composite subgrade soil is made by mixing soil, water, curing agent and cement, and the soil is produced by crushing slag soil through a crushing and mixing device.

[0013] By adopting the above technical solution, the curing agent absorbs some water to form crystal water, which fills the gaps in the roadbed, thereby reducing the occurrence of drying shrinkage after the liquid composite roadbed soil solidifies.

[0014] Optionally, after preparing the liquid composite subgrade soil, the quality of the liquid composite subgrade soil is tested. The slump of the liquid composite subgrade soil is 150-180 mm, the unconfined compressive strength after solidification is not less than 0.8 MPa, the initial setting time of the liquid composite subgrade soil is greater than or equal to 3 h, and the final setting time is less than or equal to 10 h.

[0015] By adopting the above technical solutions, it is beneficial to reduce the difference in the road support effect at each location of the roadbed, thereby reducing the occurrence of uneven road settlement.

[0016] Optionally, after leveling, drainage ditches are set on both sides of the roadbed, and a plastic film is placed over the roadbed.

[0017] By adopting the above technical solution, after the liquid composite subgrade soil is backfilled, rainwater is discharged through drainage channels, and plastic film is used to prevent rainwater from falling into the subgrade, thereby reducing the occurrence of rainwater damaging the subgrade.

[0018] A crushing and mixing device includes a crushing mechanism, a feeding hopper, a feeding conveyor belt, and a mixing tank arranged in sequence. The crushing mechanism is used to crush construction waste into soil and feed it into the feeding hopper. The mixing tank is provided with a feeding trough, one end of which penetrates through the side wall of the mixing tank and enters the interior of the mixing tank, while the other end of the feeding trough is located outside the mixing tank. The feeding conveyor belt is used to feed the soil from the feeding hopper into the feeding trough. A storage tank is provided on one side of the mixing tank, and a conveying pipe is connected between the storage tank and the mixing tank. A pump is installed on the conveying pipe. The mixing tank is equipped with a mixing mechanism for mixing cement and soil inside the mixing tank. A guide trough is installed inside the mixing tank, and the guide trough is inclined. The high end of the guide trough is located below the end of the feeding trough that extends into the mixing tank. Multiple discharge holes are opened on the bottom wall of the guide trough.

[0019] By adopting the above technical solution, water, cement, and curing agent are pre-mixed evenly to form concrete, which is then stored in a storage tank. Excavated soil is crushed into earthen material by a crushing mechanism and then sent to a feeding hopper for storage. The concrete from the storage tank is then fed into the mixing tank via a pump and conveyor pipe. The mixing mechanism is then activated, continuously agitating the concrete. The feeding hopper then sends the earthen material to a feeding conveyor belt, which in turn sends it to a feed trough. The earthen material falls along the feed trough into a guide trough, and then moves along the inclined direction of the guide trough. The earthen material gradually falls from the discharge hole onto the concrete inside the mixing tank, facilitating even distribution of the earthen material on top of the concrete and accelerating the mixing of the earthen material and concrete to form a liquid composite subgrade.

[0020] Optionally, the stirring mechanism includes a drive motor, a shaft, and blades. The body of the drive motor is fixedly installed on the top side of the stirring tank. The shaft is located inside the stirring tank, and one end of the shaft is connected to the rotating shaft of the drive motor. There is at least one blade, which is fixedly installed on the shaft. The bottom wall of the guide trough has an opening for the shaft to pass through, and the guide trough is located above each blade.

[0021] By adopting the above technical solution, the drive motor drives the shaft to rotate, and the shaft drives each blade to tumble the concrete and soil inside the mixing tank, thereby accelerating the mixing of concrete and soil to form liquid composite roadbed soil. At the same time, the guide trough is above each blade, thereby reducing the occurrence of blades touching the guide trough when rotating.

[0022] Optionally, connecting rods are fixedly installed on both sides of the feed trough, and a groove is provided on the inner side wall of the mixing tank for the connecting rods to extend and retract. A push block is fixedly installed on the shaft, and the push block passes through the through-hole. The push block is used to push the feed trough to reciprocate along the length of the connecting rod.

[0023] By adopting the above technical solution, the pusher block rotates with the shaft, and then the pusher block repeatedly pushes the opening close to the inner walls of both sides of the guide trough, thereby facilitating the reciprocating movement of the guide trough along the length of the connecting rod. Through the reciprocating movement of the guide trough, the movement of soil along the inclined direction of the guide trough is accelerated.

[0024] Optionally, the groove is also used for raising and lowering the connecting rod. A lifting block is provided inside the groove, and a spring is fixedly installed between the inner sidewall of the bottom end of the groove and the lifting block. The spring is used to drive the lifting block to move upward and press against the connecting rod.

[0025] By adopting the above technical solution, as the feed trough moves back and forth, the soil inside the feed trough will repeatedly accumulate on one side of the feed trough, resulting in one side of the feed trough being heavier than the other. The heavier side of the feed trough is pushed downward by the lifting block through the connecting rod, while the lighter side of the feed trough moves upward under the action of the spring force. This causes the two sides of the feed trough to repeatedly oscillate up and down, thereby accelerating the falling of soil from the feed trough into the mixing tank.

[0026] Optionally, the push block is inclined on the side away from the shaft, gradually approaching the shaft from top to bottom.

[0027] By adopting the above technical solution, when the pusher block abuts against one inner wall of the opening, it is guided by the tilt of the pusher block, and the pusher block exerts downward pressure on the guide trough, thereby facilitating the tilting and swaying of the guide trough to both sides. When there is little remaining soil inside the guide trough, the pusher block drives the guide trough to tilt and sway to both sides, thereby facilitating the discharge of soil from the guide trough into the mixing tank.

[0028] Optionally, the multiple discharge holes are evenly divided into multiple rows, with each row of discharge holes spaced apart along the length of the guide trough, and the diameter of each row of discharge holes gradually increases from the high end to the low end of the guide trough.

[0029] By adopting the above technical solution, the feed trough discharges soil into the high end of the guide trough, and then the soil moves from the high end to the low end of the guide trough, so that the soil gradually falls into the mixing tank through the discharge hole. Moreover, the diameter of the discharge hole gradually decreases from the high end to the low end of the guide trough, which facilitates the uniform falling of soil into the mixing tank, thereby improving the mixing speed of soil and concrete.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. By compacting each layer of liquid composite subgrade soil, the degree of drying shrinkage of the liquid composite subgrade soil is reduced. Then, each layer of liquid composite subgrade soil is leveled, thereby improving the connection strength between adjacent layers of liquid composite subgrade soil and reducing the occurrence of gaps between adjacent layers of liquid composite subgrade soil, thus facilitating the subgrade to provide good support for the road.

[0032] 2. The soil is evenly spread inside the mixing tank through the feed chute and discharge hole, thereby accelerating the mixing of concrete and soil to form liquid composite subgrade soil;

[0033] 3. By recycling and crushing slag into soil, energy conservation and environmental protection can be achieved. Attached Figure Description

[0034] Figure 1 This is a schematic diagram illustrating the principle of the backfilling method for liquid composite subgrade soil according to an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the crushing mechanism according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the feeding hopper, mixing tank, storage tank and feeding conveyor belt according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the mixing tank and storage tank structure according to an embodiment of this application;

[0038] Figure 5 yes Figure 4 Enlarged view at point A;

[0039] Figure 6 This is a schematic diagram of the structure of the mixing tank according to an embodiment of this application;

[0040] Figure 7 yes Figure 6 Sectional view at AA;

[0041] Figure 8 yes Figure 7 A schematic diagram of the structure when the pusher block presses against one inner wall of the through-hole;

[0042] Figure 9 This is a schematic diagram of the material guide channel according to an embodiment of this application;

[0043] Figure 10 yes Figure 9 Sectional view at BB.

[0044] Explanation of reference numerals in the attached drawings: 1. Feeding conveyor belt; 2. Discharge bin; 3. Mixing tank; 4. Storage tank; 5. Crushing mechanism; 51. Feeding bin; 52. Jaw crusher; 53. Vibrating screen; 54. Impact crusher; 6. Conveying pipe; 7. Pump; 8. Flow sensor; 9. Controller; 10. Mixing mechanism; 101. Drive motor; 102. Shaft; 103. Paddle; 11. First discharge conveyor belt; 12. Second discharge conveyor belt; 13. Third discharge conveyor belt; 14. Fourth discharge conveyor belt; 15. Shielding net; 16. Weighing belt scale; 17. Feed trough; 18. Guide trough; 19. Discharge hole; 20. Through port; 21. Push block; 22. Connecting rod; 23. Groove; 24. Lifting block; 25. Spring. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0046] This application discloses a method for backfilling a roadbed with liquid composite roadbed soil and a crushing and mixing device.

[0047] Reference Figure 1 A method for backfilling a roadbed with liquid composite subgrade soil, comprising the following steps:

[0048] S1. Leveling the base: Clean the base of debris and flatten it.

[0049] The foundation is typically the inner bottom wall of the excavation pit. Debris consists of loose soil, stagnant water, and tree branches on the foundation. After clearing away the debris, a tamping machine is used to compact the foundation, reducing uneven road settlement. After leveling the foundation, it is then raked to strengthen the connection between the foundation and the roadbed, thus ensuring the roadbed provides adequate support for the road.

[0050] Roads are generally quite long, and construction will be carried out in sections. If construction is suspended for an extended period or affected by rain, step S1 must be repeated when construction resumes.

[0051] S2. Preparation of liquid composite subgrade soil: The slag and soil are fed into the crushing and mixing device to produce liquid composite subgrade soil.

[0052] Excavated soil refers to the sand and gravel generated during foundation pit excavation, as well as the large amounts of excavated soil produced in construction projects such as subway construction, exploration, pile foundations, drilling, and underground foundation pit excavation. Recycling excavated soil contributes to energy conservation and environmental protection. The excavated soil is first fed into a crushing and mixing device for crushing, and then mixed with water, cement, and a curing agent to form a liquid composite roadbed soil. In this embodiment, the liquid composite roadbed soil comprises 60 parts soil, 20 parts water, 2 parts curing agent, and 20 parts cement. The curing agent combines with water to form crystalline water, filling the gaps in the liquid composite roadbed soil and reducing the occurrence of drying shrinkage. The liquid composite roadbed soil has a continuous gradation, and the gradation curve should be smooth without abrupt changes, with a non-uniformity coefficient of 40–80 and a curvature coefficient ranging from 0.2 to 0.6.

[0053] After preparing the liquid composite subgrade soil, a portion of the liquid composite subgrade soil was taken for quality monitoring. The slump of the liquid composite subgrade soil was 150–180 mm, and the unconfined compressive strength after solidification was not less than 0.8 MPa. Furthermore, in this application, the unconfined compressive strength of the liquid composite subgrade soil after 28 days also needs to be not less than 0.8 MPa. The initial setting time of the liquid composite subgrade soil was greater than or equal to 3 hours, and the final setting time was less than or equal to 10 hours.

[0054] S3. Layered pouring: Liquid composite subgrade soil is poured into the subgrade from bottom to top in multiple layers. After each layer of liquid composite subgrade soil is poured, it is compacted and then the compacted liquid composite subgrade soil is leveled.

[0055] The thickness of each layer of liquid composite subgrade soil is between 150mm and 220mm. After each layer of liquid composite subgrade soil is spread out, it is compacted with a soil rammer and then leveled. Each layer of liquid composite subgrade soil is poured into the foundation pit from bottom to top until the thickness of each layer of liquid composite subgrade soil exceeds the required thickness of the subgrade, at which point the pouring stops.

[0056] Compacting each layer of liquid composite subgrade soil helps reduce its shrinkage during drying. Then, leveling each layer increases the surface roughness, thereby improving the bond strength between adjacent layers. By reducing shrinkage and strengthening the bond between adjacent layers, the likelihood of gaps forming between them is reduced, thus ensuring the subgrade provides better support for the road.

[0057] S4. Leveling treatment: Level the subgrade according to the required backfill thickness, remove the liquid composite subgrade soil that is higher than the string line, and replenish and compact the liquid composite subgrade soil that is lower than the string line.

[0058] S5. Roadbed Protection: Drainage channels are set up on both sides of the roadbed, and plastic film is used to cover the roadbed.

[0059] Liquid composite subgrade soil takes time to solidify. After backfilling with liquid composite subgrade soil to form the subgrade, drainage ditches are dug on both sides of the subgrade, and then the subgrade is covered with plastic film to protect it.

[0060] Reference Figure 2 , Figure 3 A crushing and mixing device for producing liquid composite roadbed soil from slag and soil in this application, comprising a crushing mechanism 5, a feeding bin 2, a feeding conveyor belt 1, and a mixing tank 3 arranged in sequence.

[0061] Reference Figure 4 A storage tank 4 is provided on one side of the mixing tank 3, and a conveying pipe 6 is connected between the storage tank 4 and the mixing tank 3. A pump 7 is installed on the conveying pipe 6. After water, cement and curing agent are mixed to form concrete, the concrete is put into the storage tank 4, and then the concrete is sent into the storage pipe through the pump 7 and the conveying pipe 6.

[0062] Reference Figure 5The delivery pipe 6 is equipped with a flow sensor 8 and a controller 9. Both the pump 7 and the flow sensor 8 are electrically connected to the controller 9. The flow sensor 8 detects the concrete flow rate in the delivery pipe 6 and sends the data to the controller 9. The controller 9 calculates the amount of concrete to be added to the mixing tank 3 based on the flow rate and delivery time in the delivery pipe 6. Once sufficient concrete has been added to the mixing tank 3, the controller 9 shuts off the pump 7, thereby stopping the addition of concrete to the mixing tank 3 and improving the accuracy of the amount of concrete added to the mixing tank 3.

[0063] Reference Figure 6 , Figure 7 The mixing tank 3 is equipped with a mixing mechanism 10, which includes a drive motor 101, a shaft 102, and impellers 103. The body of the drive motor 101 is fixedly installed on the top side of the mixing tank 3, and the shaft 102 is located inside the mixing tank 3, with one end of the shaft 102 connected to the rotating shaft of the drive motor 101. There is at least one impeller 103, which is fixedly installed on the shaft of the shaft 102. When the drive motor 101 is started, it drives the shaft 102 to rotate, and the shaft 102 drives the impeller 103 to agitate the concrete inside the mixing tank 3.

[0064] Reference Figure 2 , Figure 3 The crushing mechanism 5 includes, in sequence, a feed bin 51, a jaw crusher 52, a vibrating screen 53, and an impact crusher 54. The feed bin 51 is used to hold the slag and soil, and the discharge port of the feed bin 51 faces the feed port of the jaw crusher 52. The slag and soil are conveyed to the jaw crusher 52 through the feed bin 51.

[0065] Reference Figure 2 , Figure 3 A first discharge conveyor belt 11 is provided between the jaw crusher 52 and the vibrating screen 53. After the jaw crusher 52 performs initial crushing of the slag, it is discharged into the first discharge conveyor belt 11, which then sends the slag into the vibrating screen 53.

[0066] Reference Figure 2 , Figure 3 A second discharge conveyor belt 12 is provided between the vibrating screen 53 and the impact crusher 54, and a third discharge conveyor belt 13 is also connected between the vibrating screen 53 and the feeding bin 2. After the slag crushed by the jaw crusher 52 enters the vibrating screen 53, the vibrating screen 53 sends the slag with larger particle size to the impact crusher 54 for further crushing via the second discharge conveyor belt 12, while the slag with smaller particle size forms soil. The soil is then sent to the feeding bin 2 for storage via the third discharge conveyor belt 13.

[0067] Reference Figure 2 , Figure 3A fourth discharge conveyor belt 14 connects the impact crusher 54 to the feeding hopper 2. The impact crusher 54 further crushes the slag into soil, which is then sent to the feeding hopper 2 for storage via the fourth discharge conveyor belt 14.

[0068] Reference Figure 2 , Figure 3 The material feeding hopper 2 has multiple compartments. The third discharge conveyor belt 13 and the fourth discharge conveyor belt 14 deliver the soil material into different material feeding hoppers 2, thus facilitating the separate storage of soil materials of different particle sizes. Subsequently, during the production of liquid composite subgrade soil, soil materials of different particle sizes are quantitatively supplied for mixing, thereby facilitating the continuous gradation of the liquid composite subgrade soil.

[0069] Reference Figure 3 The top side opening of the discharge bin 2 facilitates the feeding of soil into the discharge bin 2 by the third discharge conveyor belt 13 and the fourth discharge conveyor belt 14. A shielding net 15 is fixedly installed on the top side of the discharge bin 2 to prevent debris from entering the discharge bin 2.

[0070] Reference Figure 3 The feeding bin 2 is equipped with a weighing belt scale 16. The feeding bin 2 sends soil into the feeding conveyor belt 1 through the weighing belt scale 16, thereby improving the accuracy of the amount of soil conveyed from the feeding bin 2 to the feeding conveyor belt 1.

[0071] Reference Figure 4 The mixing tank 3 is equipped with a feed trough 17. One end of the feed trough 17 penetrates the side wall of the mixing tank 3 and enters the interior of the mixing tank 3, while the other end of the feed trough 17 is located outside the mixing tank 3. The end of the feed trough 17 inside the mixing tank 3 is lower than the other end and is set at an inclination. The feeding conveyor belt 1 feeds the soil into the feed trough 17, and then the soil falls into the interior of the mixing tank 3 along the inclination direction of the feed trough 17.

[0072] Reference Figure 7 , Figure 8 The mixing tank 3 is equipped with a material guide trough 18, which is inclined and gradually decreases from one end to the other. The high end of the material guide trough 18 is located below the feed trough 17. When the feed trough 17 discharges soil into the mixing tank 3, the soil will first fall into the material guide trough 18.

[0073] Reference Figure 9 The material guide trough 18 has multiple discharge holes 19, which are evenly arranged in multiple rows. Each row of discharge holes 19 is spaced apart along the length of the material guide trough 18, and the diameter of each row of discharge holes 19 gradually increases from the high end to the low end of the material guide trough 18.

[0074] As the soil material moves along the inclined direction of the guide trough 18, it gradually falls from the discharge hole 19 onto the concrete inside the mixing tank 3. The guide plate and discharge hole 19 work together to spread the soil material above the concrete inside the mixing tank 3, thereby accelerating the mixing of concrete and soil to form a liquid composite subgrade. Furthermore, the discharge hole 19 gradually increases in size from the high end to the low end of the guide trough 18, which facilitates the even spreading of soil material above the concrete inside the mixing tank 3.

[0075] Reference Figure 8 The bottom of the feed trough 18 is provided with an opening 20, through which the shaft 102 passes. The feed trough 18 is located above each blade 103, thereby reducing the occurrence of the blade 103 contacting the feed trough 18 after rotation.

[0076] Reference Figure 7 , Figure 8 A pusher block 21 is fixedly installed on the shaft 102, and at least two connecting rods 22 are fixedly installed on both outer side walls of the guide trough 18. In this embodiment, each outer side wall of the guide trough has three connecting rods 22.

[0077] Reference Figure 8 , Figure 10 The inner wall of the mixing tank 3 has a groove 23 for the extension and retraction of the connecting rod 22. The groove 23 is also used for the lifting and lowering of the connecting rod 22. A lifting block 24 is provided inside the groove 23, and a spring 25 is fixedly installed between the inner wall of the bottom end of the groove 23 and the lifting block 24. The spring 25 is used to drive the lifting block 24 to move upward and press against the connecting rod 22.

[0078] When the shaft 102 rotates, the push block 21 rotates with the shaft 102. The push block 21 repeatedly pushes the opening 20 toward the inner wall of the guide trough 18, causing the guide trough 18 to reciprocate along the length of the connecting rod 22. During the reciprocating motion of the guide trough 18, the pressure on the lifting block 24 on one side of the guide trough 18 increases, causing the guide trough 18 to press the lifting block 24 downward through the connecting rod 22. The pressure on the lifting block 24 on the other side of the guide trough 18 decreases, causing the spring 25 to drive the lifting block 24 upward. By having the lifting blocks 24 located on both sides of the guide trough 18 move in opposite directions, the guide trough 18 repeatedly shakes.

[0079] By moving the guide trough 18 along the length of the connecting rod 22 and by repeatedly shaking the guide trough 18, the soil inside the guide trough 18 can be easily shaken off, allowing the soil to move along the inclined direction of the guide trough 18.

[0080] Reference Figure 8The push block 21, positioned at an angle from top to bottom, gradually approaches the shaft 102 from the side furthest from the shaft 102. When the push block 21 presses against one inner wall of the opening 20, the angle of the push block 21 contributes force, causing it to repeatedly tilt and shake the guide trough 18 to both sides. When there is little soil inside the guide trough 18, the push block 21 causes the guide trough 18 to shake, facilitating the shaking off of the soil.

[0081] When adding soil to the mixing tank 3, the soil is added in multiple batches, with a time interval of about 30 seconds between each addition. This helps to improve the strength of the liquid composite subgrade soil formed by mixing the soil with concrete.

[0082] The implementation principle of the method for backfilling a roadbed with liquid composite subgrade soil and the crushing and mixing device in this application embodiment is as follows: When backfilling the roadbed, each layer of liquid composite subgrade soil is compacted to reduce the thickness of the poles, and each layer of liquid composite subgrade soil is raked to improve the connection strength between adjacent layers of liquid composite subgrade soil, thereby reducing the occurrence of gaps between the two layers of liquid composite subgrade soil, and thus facilitating the roadbed to play a good supporting role for the road.

[0083] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crushing and mixing device, characterized in that: The system includes a crushing mechanism (5), a feeding bin (2), a feeding conveyor belt (1), and a mixing tank (3) arranged in sequence. The crushing mechanism (5) is used to crush construction waste into soil and feed it into the feeding bin (2). The mixing tank (3) is provided with a feeding trough (17). One end of the feeding trough (17) penetrates the side wall of the mixing tank (3) and enters the interior of the mixing tank (3). The other end of the feeding trough (17) is located outside the mixing tank (3). The feeding conveyor belt (1) is used to feed the soil from the feeding bin (2) into the feeding trough (17). A storage tank (4) is provided on one side of the mixing tank (3). A conveying pipe (6) is connected between the storage tank (4) and the mixing tank (3). A pump (7) is installed on the conveying pipe (6). A stirring mechanism (10) is installed on the mixing tank (3). The stirring mechanism (10) is used to stir the cement and soil inside the mixing tank (3). A guide trough (18) is installed inside the mixing tank (3). The guide trough (18) is inclined. The high end of the guide trough (18) is located below the end of the feed trough (17) that extends into the mixing tank (3). Multiple discharge holes (19) are opened on the bottom wall of the guide trough (18). The stirring mechanism (10) includes a drive motor (101), a shaft (102), and a blade (103). The body of the drive motor (101) is fixedly installed on the top side of the stirring tank (3). The shaft (102) is located inside the stirring tank (3). One end of the shaft (102) is connected to the rotating shaft of the drive motor (101). There is at least one blade (103). The blade (103) is fixedly installed on the shaft (102). The bottom wall of the guide trough (18) is provided with a passage (20) for the shaft (102) to pass through. The guide trough (18) is located above each blade (103). Connecting rods (22) are fixedly installed on both sides of the material guide trough (18). The inner side wall of the mixing tank (3) is provided with a groove (23) for the extension and retraction of the connecting rods (22). A push block (21) is fixedly installed on the shaft (102). The push block (21) passes through the opening (20). The push block (21) is used to push the material guide trough (18) to move back and forth along the length direction of the connecting rods (22). The groove (23) is also used for lifting the connecting rod (22). A lifting block (24) is provided inside the groove (23). A spring (25) is fixedly installed between the inner sidewall of the bottom end of the groove (23) and the lifting block (24). The spring (25) is used to drive the lifting block (24) to move upward and press against the connecting rod (22).

2. The crushing and mixing device according to claim 1, characterized in that: The push block (21) is inclined on the side away from the shaft (102) and gradually approaches the shaft (102) from top to bottom.

3. The crushing and mixing device according to claim 1, characterized in that: The multiple discharge holes (19) are evenly divided into multiple rows. Each row of discharge holes (19) is spaced apart along the length of the guide trough (18). The diameter of each row of discharge holes (19) gradually increases from the high end to the low end of the guide trough (18).

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