A continuous operation earthwork mixing plant and its working method

Abstract

The present invention relates to the technical field of earthwork mixing, and specifically to a continuous earthwork mixing building and its working method, which includes a crusher, an aggregate hopper, an earthwork hopper, a variable-frequency conveyor belt, a first lime hopper, a dryer, a mixture hopper, a second lime hopper and a mixer. Among them, multiple groups of variable-frequency conveyor belts are provided and can be frequency-controlled. A vibrating feeder hopper is arranged below the aggregate hopper, and the aggregate hopper inputs earthwork materials into the crusher through the vibrating feeder hopper; the present invention uses continuous crushing equipment to preliminarily crush the earthwork materials and simultaneously achieve preliminary water content control, and then uses an accurate electronic weighing module to weigh the earthwork materials and lime powder, and can continuously produce a large amount of earthwork lime mixture with accurate water content and uniform mixing.

Description

Technical Field

[0001] The present invention relates to the technical field of earthwork mixing, and specifically relates to a continuous operation earthwork mixing plant and its working method. Background Art

[0002] An earthwork mixing plant is a large mechanical equipment combination used for mixing and stirring earthwork materials. By precisely controlling the ratio of earthwork and added materials and fully stirring, the mixed earthwork can meet the engineering design requirements in terms of water content, density, strength, etc., ensuring the quality and stability of the project; for example, when building the subgrade of a highway, the earthwork processed by the mixing plant is used as subgrade filling material, and its quality is uniform and stable, which can effectively prevent problems such as uneven settlement of the subgrade. In the prior art, when mixing and stirring earthwork materials and lime powder, the earthwork mixing plant usually forms the mixture in one time, and the control of the water content and mixing uniformity of the mixture is not precise enough. Summary of the Invention

[0003] The purpose of the present invention is to provide a continuous operation earthwork mixing plant and its working method to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A continuous operation earthwork mixing plant includes a crusher, an aggregate hopper, an earthwork hopper, a variable frequency conveyor belt, a first lime hopper, a dryer, a mixture hopper, a second lime hopper and a mixer. Among them, multiple groups of variable frequency conveyor belts are provided and can be frequency-controlled. A vibrating feeder hopper is arranged below the aggregate hopper. The aggregate hopper inputs earthwork materials into the crusher through the vibrating feeder hopper. The earthwork hopper inputs earthwork materials into the aggregate hopper through its corresponding variable frequency conveyor belt. The first lime hopper inputs lime powder into the crusher through its corresponding variable frequency conveyor belt. The mixture output by the crusher is conveyed through a variable frequency conveyor belt, passes through a dryer during this period, and finally is output into the mixture hopper. Electronic weighing modules are respectively arranged at the bottoms of the mixture hopper and the second lime hopper. The electronic weighing modules can control the feeding weights of the mixture hopper and the second lime hopper. The feeding of the mixture hopper and the second lime hopper is input into the mixer through a variable frequency conveyor belt.

[0005] An outer mounting frame is fixedly arranged outside the aggregate hopper. The aggregate hopper is fixedly installed with the crusher through the outer mounting frame. A support spring is arranged on the outer mounting frame. The support spring elastically supports the vibrating feeder hopper. An eccentric vibration motor is fixedly arranged outside the vibrating feeder hopper.

[0006] A primary screen and a secondary screen are fixedly arranged in the aggregate hopper. The aperture of the sieve holes of the primary screen is larger than that of the secondary screen. The primary screen is located above the secondary screen.

[0007] A relevant coupling shaft is fixedly connected to both the primary screen and the secondary screen. A regulating air hood is fixedly arranged at the lower end of the relevant coupling shaft. An air hood piston is arranged in the regulating air hood. The air hood piston is in airtight contact with the regulating air hood. A split top shaft is fixedly arranged on the lower surface of the air hood piston. The lower end of the split top shaft contacts the upper surface of the vibrating feeder hopper.

[0008] A limiting collar is sleeved outside the split top shaft. A collar support arm is fixedly arranged between the limiting collar and the aggregate hopper. A corrugated dust-proof sleeve is connected between the limiting collar and the regulating air hood.

[0009] An active inner groove and a pressure transformation chamber are formed in the collar support arm. A top shaft air passage is formed in the split top shaft. An active air pipe is arranged in the active inner groove. The pressure transformation chamber is communicated with the top shaft air passage through the active air pipe. The other end of the top shaft air passage is communicated with the upper surface of the air hood piston.

[0010] A blanking push umbrella is fixedly arranged on the outer surface of the split top shaft. The blanking push umbrella corresponds to the lower opening position of the aggregate hopper. A pressure transformation piston is arranged in the pressure transformation chamber in an airtight and sliding manner. A horizontal shaft is fixedly arranged on one side of the pressure transformation piston. An extrusion vertical plate is fixedly arranged at the end of the horizontal shaft.

[0011] A lever pressing plate is rotatably arranged outside the aggregate hopper. A lead screw sleeve is installed on the lever pressing plate in a limited sliding manner. The lead screw sleeve can slide along the length direction of the lever pressing plate and can rotate relative to the lever pressing plate. A driving lead screw is inserted into the lead screw sleeve. The driving lead screw is in screw fit with the lead screw sleeve. When the driving lead screw rotates, the lever pressing plate can be driven to rotate through the lead screw sleeve. When the lever pressing plate rotates, the extrusion vertical plate can be extruded to drive the pressure transformation piston to axially move.

[0012] A laser detection strip is embedded and installed on one side surface inside the aggregate hopper. A reflection panel is embedded and installed on the other side surface inside the aggregate hopper. Through the cooperation of the laser detection strip and the reflection panel, the stacking amount of the earthwork material above the primary screen and the secondary screen is detected.

[0013] A working method of a continuous operation earthwork mixing plant, the working method comprising the following steps:

[0014] Step 1: The earthwork hopper inputs the earthwork material into the aggregate hopper through a variable frequency conveyor belt. The aggregate hopper supplies the earthwork material to the crusher through the vibrating feeder hopper; the first lime hopper inputs lime powder into the crusher through a variable frequency conveyor belt. By controlling the conveying speed of the variable frequency conveyor belt through frequency conversion, the lime powder is proportional to the output earthwork material of the vibrating feeder hopper, realizing preliminary moisture content control;

[0015] Step 2: The crusher crushes and mixes the lime powder and the earthwork material. After drying by the dryer, it is input into the mixing hopper.

[0016] Step 3: The mixing hopper and the second lime hopper are weighed and discharged through the electronic weighing module.

[0017] Step 4: The output materials of the mixing hopper and the second lime hopper are input into the mixer through the variable-frequency conveyor belt for mixing.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The continuous-operation earthwork mixing plant of the present invention uses a continuous crushing device to preliminarily crush the earthwork material, and at the same time realizes preliminary water content control. Then, the precise electronic weighing module is used to weigh the earthwork material and the lime powder, and then the mixture is transported to the mixer for stirring, and its water content, lime content, and stirring uniformity are controlled within the required index parameters. The present invention can continuously produce a large amount of earthwork lime mixture with precise water content and uniform stirring, enabling factory and standardized production of high-quality earthwork lime mixture.

[0020] The aggregate hopper of the present invention can screen out larger particles of earthwork and discharge them in grades, which can be used for foundation filling or other non-structural purposes, while the fine particles enter the next process for further crushing to improve the control effect of the earthwork particle size.

[0021] Through the cooperation of structures such as the associated shaft, split top shaft, and variable pressure chamber provided in the present invention, the amplitude of the primary screen and the secondary screen can be controlled according to the amount of earthwork above the primary screen and the secondary screen. When the amount of earthwork is large, the amplitude is automatically increased to accelerate the screening of the earthwork material, and when the amount of earthwork is small, the amplitude is reduced to reduce unnecessary deformation fatigue loss of the primary screen and the secondary screen.

[0022] In the present invention, the vibration of the vibrating feeder hopper is transmitted through the separate setting of the associated shaft and the split top shaft, so that while dynamically adjusting the amplitude of the primary screen and the secondary screen, the amplitude of the split top shaft is still maintained at the maximum state, enabling the split top shaft to efficiently promote the discharge of the earthwork material. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the continuous-operation earthwork mixing plant of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the aggregate hopper and the vibrating feeder hopper.

[0025] Figure 3 It is a schematic internal structural diagram of the aggregate hopper and the vibrating feeder hopper.

[0026] Figure 4 is Figure 3 The enlarged schematic diagram of area A in

[0027] Figure 5 is the three-dimensional semi-section schematic diagram of the aggregate hopper and the vibrating feeding hopper.

[0028] Figure 6 is Figure 5 The enlarged schematic diagram of area B in

[0029] In the figure: 1. Crusher; 2. Aggregate hopper; 3. Vibrating feeding hopper; 4. Earthwork hopper; 5. Variable-frequency conveyor belt; 6. First lime hopper; 7. Dryer; 8. Mixing hopper; 9. Second lime hopper; 10. Electronic weighing module; 11. Mixer; 301. Outer mounting frame; 302. Support spring; 303. Eccentric vibration motor; 201. Primary screen; 202. Secondary screen; 203. Connecting shaft; 204. Regulation air hood; 205. Air hood piston; 206. Split top shaft; 207. Limit collar; 208. Collar support arm; 209. Corrugated dust-proof sleeve; 210. Movable inner groove; 211. Variable pressure chamber; 212. Top shaft air path; 213. Movable air pipe; 214. Feeding push umbrella; 215. Variable pressure piston; 216. Horizontal shaft; 217. Extrusion vertical plate; 218. Lever pressing plate; 219. Lead screw sleeve; 220. Driving lead screw; 221. Laser detection strip; 222. Reflection panel. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 to 6 , the present invention provides a technical solution: a continuous operation earthwork mixing plant, as Figure 1 shown in, includes a crusher 1, an aggregate hopper 2, an earthwork hopper 4, a variable-frequency conveyor belt 5, a first lime hopper 6, a dryer 7, a mixing hopper 8, a second lime hopper 9 and a mixer 11. Among them, multiple groups of variable-frequency conveyor belts 5 are provided and can be frequency-converted controlled. The frequency-converted control of the variable-frequency conveyor belt 5 is realized by changing the frequency of the motor input power supply to adjust the motor speed, thereby controlling the running speed of the variable-frequency conveyor belt 5.

[0032] Below the aggregate hopper 2, there is a vibrating feed hopper 3. The aggregate hopper 2 inputs the earthwork material into the crusher 1 through the vibrating feed hopper 3. The earthwork hopper 4 inputs the earthwork material into the aggregate hopper 2 through its corresponding variable-frequency conveyor belt 5. The first lime hopper 6 inputs lime powder into the crusher 1 through its corresponding variable-frequency conveyor belt 5. The mixture output by the crusher 1 is conveyed through the variable-frequency conveyor belt 5. During this process, it passes through the dryer 7. The dryer 7 can spray hot air to dry the passing mixture as needed, and finally outputs it to the mixture hopper 8. Electronic weighing modules 10 are respectively arranged at the bottoms of the mixture hopper 8 and the second lime hopper 9. The electronic weighing modules 10 can control the feeding weights of the mixture hopper 8 and the second lime hopper 9. The feeding of the mixture hopper 8 and the second lime hopper 9 is input into the mixer 11 through the variable-frequency conveyor belt 5. Both the first lime hopper 6 and the second lime hopper 9 store lime powder.

[0033] An external mounting frame 301 is fixedly arranged outside the aggregate hopper 2. The aggregate hopper 2 is fixedly installed with the crusher 1 through the external mounting frame 301. A support spring 302 is arranged on the external mounting frame 301. The support spring 302 elastically supports the vibrating feed hopper 3. An eccentric vibration motor 303 is fixedly arranged outside the vibrating feed hopper 3.

[0034] A primary screen 201 and a secondary screen 202 are fixedly arranged in the aggregate hopper 2. The aperture of the screen holes of the primary screen 201 is larger than that of the secondary screen 202. The primary screen 201 is above the secondary screen 202. Discharge windows are opened on the surface of the aggregate hopper 2, corresponding to the primary screen 201 and the secondary screen 202 respectively, as Figure 2 shown in.

[0035] A connecting shaft 203 is fixedly connected to both the primary screen 201 and the secondary screen 202. A regulating air hood 204 is fixedly arranged at the lower end of the connecting shaft 203. An air hood piston 205 is arranged in the regulating air hood 204. The air hood piston 205 is in airtight contact with the regulating air hood 204. A split top shaft 206 is fixedly arranged on the lower surface of the air hood piston 205. The lower end of the split top shaft 206 contacts the upper surface of the vibrating feed hopper 3.

[0036] A limiting collar 207 is sleeved outside the split top shaft 206. A collar support arm 208 is fixedly arranged between the limiting collar 207 and the aggregate hopper 2. A corrugated dust-proof sleeve 209 is connected between the limiting collar 207 and the regulating air hood 204. An activity inner groove 210 and a variable-pressure chamber 211 are opened in the collar support arm 208. A top shaft air passage 212 is opened in the split top shaft 206. An activity air pipe 213 is arranged in the activity inner groove 210. The variable-pressure chamber 211 is communicated with the top shaft air passage 212 through the activity air pipe 213. The other end of the top shaft air passage 212 is communicated with the upper surface of the air hood piston 205.

[0037] The outer surface of the split jacking shaft 206 is fixedly provided with a blanking pushing umbrella 214, which corresponds to the lower opening position of the aggregate hopper 2. A pressure-changing piston 215 is hermetically and slidably arranged in the pressure-changing cavity 211. One side of the pressure-changing piston 215 is fixedly provided with a horizontal shaft 216, and the end of the horizontal shaft 216 is fixedly provided with a pressing vertical plate 217.

[0038] The outside of the aggregate hopper 2 is rotatably provided with a lever pressing plate 218. A lead screw sleeve 219 is installed on the lever pressing plate 218 in a limited sliding manner. The lead screw sleeve 219 can slide along the length direction of the lever pressing plate 218 and can rotate relative to the lever pressing plate 218. A driving lead screw 220 is inserted into the lead screw sleeve 219, and the driving lead screw 220 is in screw fit with the lead screw sleeve 219. When the driving lead screw 220 rotates, it can drive the lever pressing plate 218 to rotate through the lead screw sleeve 219. When the lever pressing plate 218 rotates, it can press the pressing vertical plate 217 to drive the axial movement of the pressure-changing piston 215.

[0039] On one side surface inside the aggregate hopper 2, a laser detection strip 221 is embedded and installed. On the other side surface inside the aggregate hopper 2, a reflection panel 222 is embedded and installed. Through the cooperation of the laser detection strip 221 and the reflection panel 222, the stacking amount of the earthwork material above the primary screen 201 and the secondary screen 202 is detected. It is also possible to use a lidar for stacking amount scanning and analysis. The above are common devices in the prior art and will not be elaborated in this application.

[0040] A working method of a continuous-operation earthwork mixing plant, the working method includes the following steps:

[0041] Step 1: The earthwork hopper 4 inputs the earthwork material into the aggregate hopper 2 through the variable-frequency conveyor belt 5, and the aggregate hopper 2 supplies the material to the crusher 1 through the vibrating feeder hopper 3; the first lime hopper 6 inputs lime powder into the crusher 1 through the variable-frequency conveyor belt 5. By controlling the conveying speed of the variable-frequency conveyor belt 5 through frequency conversion, the lime powder and the output earthwork material of the vibrating feeder hopper 3 are made proportional to achieve preliminary moisture content control;

[0042] Step 2: The crusher 1 crushes and mixes the lime powder and the earthwork material, and after drying by the dryer 7, it is input into the mixing hopper 8;

[0043] Step 3: The mixing hopper 8 and the second lime hopper 9 are weighed and discharged through the electronic weighing module 10;

[0044] Step 4: The output materials of the mixing hopper 8 and the second lime hopper 9 are input into the mixer 11 through the variable-frequency conveyor belt 5 for mixing.

[0045] The aggregate hopper 2 in the present invention is as Figure 3 and Figure 4As shown in the figure, during use, the earthwork hopper 4 inputs earthwork materials into the aggregate hopper 2 through the variable-frequency conveyor belt 5; the eccentric vibration motor 303 operates to drive the vibrating feeder hopper 3 to vibrate. The vibrating feeder hopper 3 drives the primary screen 201 and the secondary screen 202 to vibrate up and down through the conduction of the split top shaft 206 and the connecting shaft 203, so that the earthwork materials input into the aggregate hopper 2 are screened. The earthwork materials with larger particles stay on the primary screen 201 and the secondary screen 202 respectively and are discharged with the vibration; the earthwork materials with smaller particles fall on the vibrating feeder hopper 3, and the vibrating feeder hopper 3 feeds materials through vibration, and the feeding flow rate of the vibrating feeder hopper 3 is controlled by controlling the amplitude and frequency of the vibrating feeder hopper 3. As Figure 1 shown in the figure, the first lime hopper 6 inputs lime powder into the pulverizer 1 through the variable-frequency conveyor belt 5. At this time, by controlling the transmission speed of the variable-frequency conveyor belt 5, the flow rate of the lime powder input into the pulverizer 1 and the feeding flow rate of the vibrating feeder hopper 3 are adapted proportionally to achieve preliminary humidity control.

[0046] As Figure 6 shown in the figure, due to the limitation of the limit collar 207, the split top shaft 206 is in a lifting and vibrating state under the vibration drive of the vibrating feeder hopper 3. When the split top shaft 206 is in the upward movement stroke in the vibration amplitude, the air hood piston 205 moves upward synchronously. At this time, there is positive pressure above the air hood piston 205, and the air hood piston 205 pushes the connecting shaft 203 upward through air pressure to achieve vibration conduction. At this time, the gas in the space above the air hood piston 205 will be compressed to a certain extent, and the degree of compression is related to the air pressure in the space above the air hood piston 205 in the initial state. The greater the air pressure in the space above the air hood piston 205 in the initial state, the smaller the degree of compression of the gas in the space above the air hood piston 205 during the upward vibration conduction process, so the weakening of the amplitude during the conduction process is smaller.

[0047] When the driving screw 220 rotates, it can drive the screw sleeve 219 to move horizontally. The driving screw 220 is driven by a motor. When the screw sleeve 219 moves horizontally, it can drive the lever pressing plate 218 to rotate. The lever pressing plate 218 squeezes and drives the extrusion vertical plate 217, so that the variable-pressure piston 215 moves axially, so that the gas in the variable-pressure chamber 211 can be squeezed and sent into the space above the air hood piston 205 through the movable air pipe 213 and the top shaft air path 212, thereby changing the pressure of the gas in the space above the air hood piston 205; when the laser detection strip 221 and the reflection panel 222 detect that there is more earthwork material accumulated above the primary screen 201 and the secondary screen 202, the pressure of the gas in the space above the air hood piston 205 is increased, and the weakening of the amplitude during the conduction process is reduced, so that the primary screen 201 and the secondary screen 202 vibrate greatly, improving the efficiency; otherwise, the amplitude is reduced to reduce unnecessary deformation fatigue loss.

[0048] In the process of realizing the amplitude adjustment of the associated shaft 203, through structural settings, the split top shaft 206 can maintain the maximum amplitude state. At this time, the split top shaft 206 drives the blanking push umbrella 214 to lift and vibrate, which can effectively promote the falling of the earthwork material at the blanking port of the aggregate hopper 2 and reduce the probability of accumulation and jamming.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous operation earthwork mixing plant, comprising a crusher (1), a collecting hopper (2), an earthwork hopper (4), a variable frequency conveyor belt (5), a first lime hopper (6), a drying machine (7), a mixing hopper (8), a second lime hopper (9) and a mixer (11), wherein the variable frequency conveyor belt (5) is provided with a plurality of groups and can be frequency-controlled, and is characterized in that: A vibrating feed hopper (3) is provided below the collecting hopper (2), and the collecting hopper (2) inputs earthwork materials into the crusher (1) through the vibrating feed hopper (3); the earthwork hopper (4) inputs earthwork materials into the collecting hopper (2) through the corresponding variable frequency conveyor belt (5); and the first lime hopper (6) inputs lime powder into the crusher (1) through the corresponding variable frequency conveyor belt (5); the mixed material output from the crusher (1) is conveyed through the variable frequency conveyor belt (5), passes through a dryer (7), and is finally output to the mixing hopper (8); the bottoms of the mixing hopper (8) and the second lime hopper (9) are respectively provided with electronic weighing modules (10), and the electronic weighing modules (10) are capable of controlling the weight of the materials discharged from the mixing hopper (8) and the second lime hopper (9), and the materials discharged from the mixing hopper (8) and the second lime hopper (9) are input to the mixer (11) through the variable frequency conveyor belt (5); A primary screen (201) and a secondary screen (202) are fixedly arranged in the collecting hopper (2); a correlation shaft (203) is fixedly connected to the primary screen (201) and the secondary screen (202); a regulating air hood (204) is fixedly arranged at the lower end of the regulating air hood (203); a gas hood piston (205) is arranged in the regulating air hood (204); the gas hood piston (205) is in airtight contact with the regulating air hood (204); the lower end of the gas hood piston (205) is fixedly arranged at the lower end of the regulating air hood (204); A split top shaft (206) is fixedly arranged on the surface, and the lower end of the split top shaft (206) contacts the upper surface of the vibrating feed hopper (3); a laser detection strip (221) is embedded and installed on the inner surface of one side of the collecting hopper (2), and a reflection panel (222) is embedded and installed on the inner surface of the other side of the collecting hopper (2); the laser detection strip (221) cooperates with the reflection panel (222) to detect the accumulation amount of earth and material above the primary screen (201) and the secondary screen (202).

2. The continuous operation earthwork mixing plant according to claim 1 is characterized by: An external mounting frame (301) is fixedly provided on the outside of the collecting hopper (2); the collecting hopper (2) is fixedly mounted on the pulverizer (1) via the external mounting frame (301); a support spring (302) is provided on the external mounting frame (301); the support spring (302) elastically supports the vibrating feed hopper (3); and an eccentric vibrating motor (303) is fixedly provided on the outside of the vibrating feed hopper (3).

3. The continuous operation earthwork mixing plant according to claim 1 is characterized in that: The sieve hole diameter of the primary sieve (201) is larger than the sieve hole diameter of the secondary sieve (202), and the primary sieve (201) is located above the secondary sieve (202).

4. The continuous operation earthwork mixing plant according to claim 3 is characterized by: The split top shaft (206) is externally sleeved with a limiting collar (207), a collar support arm (208) is fixedly provided between the limiting collar (207) and the collecting hopper (2), and a corrugated dust cover (209) is connected between the limiting collar (207) and the regulating air hood (204).

5. The continuous operation earthwork mixing plant according to claim 4 is characterized by: The sleeve support arm (208) is provided with a movable inner groove (210) and a pressure-changing chamber (211); the split top shaft (206) is provided with a top shaft air path (212); a movable air pipe (213) is provided in the movable inner groove (210); the pressure-changing chamber (211) is connected to the top shaft air path (212) via the movable air pipe (213); and the other end of the top shaft air path (212) is connected to the upper surface of the gas cover piston (205).

6. The continuous operation earthwork mixing plant according to claim 5 is characterized by: A material discharge push umbrella (214) is fixedly provided on the outer surface of the split top shaft (206), and the material discharge push umbrella (214) corresponds to the lower opening position of the collecting hopper (2). A pressure-changing piston (215) is airtightly slidably provided in the pressure-changing chamber (211), a horizontal shaft (216) is fixedly provided on one side of the pressure-changing piston (215), and an extrusion vertical plate (217) is fixedly provided at the end of the horizontal shaft (216).

7. The continuous operation earthwork mixing plant according to claim 6 is characterized by: The collecting hopper (2) is provided with a lever pressure plate (218) for rotation outside. The lever pressure plate (218) is provided with a screw sleeve (219) for sliding at the upper limit position. The screw sleeve (219) can slide along the length direction of the lever pressure plate (218) and can rotate relative to the lever pressure plate (218). A driving screw (220) is inserted in the screw sleeve (219). The driving screw (220) is screw-matched with the screw sleeve (219). When the driving screw (220) rotates, the lever pressure plate (218) can be driven to rotate through the screw sleeve (219). When the lever pressure plate (218) rotates, the extrusion vertical plate (217) can be extruded to drive the variable pressure piston (215) to move axially.

8. A working method of a continuous earth-mixing plant according to any one of claims 1 to 7, characterized in that: The working method comprises the following steps: Step 1: The earth hopper (4) inputs the earth material into the collecting hopper (2) through the variable frequency conveyor belt (5), and the collecting hopper (2) feeds the material into the crusher (1) through the vibrating feeder hopper (3); the first lime hopper (6) inputs lime powder into the crusher (1) through the variable frequency conveyor belt (5), and the conveying speed of the variable frequency conveyor belt (5) is controlled by frequency conversion so that the lime powder is proportional to the earth material output from the vibrating feeder hopper (3), thereby realizing preliminary water content control; Step 2: The pulverizer (1) pulverizes and mixes the lime powder and the earth material, dries them in the dryer (7), and then inputs them into the mixing hopper (8); Step 3: The mixing hopper (8) and the second lime hopper (9) are weighed and discharged through an electronic weighing module (10); Step 4: The output materials from the mixing hopper (8) and the second lime hopper (9) are input into the mixer (11) through the variable frequency conveyor belt (5) for mixing.

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