An automatic mixing truck and a mixing method

Abstract

The application provides an automatic stirring tractor, belonging to the technical field of stirring equipment, which comprises a stirring mechanism, a feeding mechanism, an electrical control mechanism and a water supply mechanism installed on a chassis mechanism, and the feeding mechanism and the water supply mechanism supply materials and water to the stirring mechanism through the electrical control mechanism. The application also provides an automatic stirring method for the automatic stirring tractor, which adopts a single-chip microcomputer control automatic program, and when the electromagnetic flowmeter reaches a set value, the powder feeding is started, and when the gravity sensor reaches a predetermined value, the first upper stirring motor and the second upper stirring motor start to operate the stirring work, and the double stirring feeding and simultaneous stirring are realized through the water feeding pneumatic butterfly valve. According to the material requirements of the stirring, after the stirring is fixed for a time, the opening and closing of the lower discharging pneumatic butterfly valve discharge the stirring material to the lower stirring barrel, and at the same time, the lower stirring motor operates, and the lower stirring rod performs the stirring work until the set time, then the discharging butterfly valve is opened, and the material is discharged.

Description

Technical Field

[0001] This invention belongs to the field of mixing equipment technology, specifically relating to an automatic mixing tractor and a mixing method. Background Technology

[0002] Mixing equipment has begun to be used in many places, especially in many industries and fields. In industries such as food, chemical and construction, mixing is required to achieve uniform mixing of materials and meet process requirements. As the demand for mixing is developing towards diversification, mixing efficiency, automation level and applicability to various emergency scenarios are all important requirements for the development of mixing equipment. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an automatic mixing tractor and mixing method, which achieves fully automatic and rapid mixing of materials from feeding to mixing and discharging. Furthermore, the mixing tractor can be towed to the scene where the mixed materials are to be used, eliminating the need for secondary transportation, thus making it convenient and efficient.

[0004] The technical solution adopted in this invention is as follows:

[0005] An automatic concrete mixer tractor includes a mixing mechanism, a feeding mechanism, and a water supply mechanism mounted on a chassis, wherein the feeding mechanism and the water supply mechanism supply material and water to the mixing mechanism.

[0006] The stirring mechanism includes a first upper stirring tank, a second upper stirring tank, and a lower stirring tank. The first upper stirring tank and the second upper stirring tank are mounted side by side on a stirring tank safety frame. The lower stirring tank is located below the first upper stirring tank and the second upper stirring tank. The lower stirring tank and the stirring tank mounting frame are mounted on a chassis mechanism.

[0007] The feeding mechanism includes a feeding hopper, a screw feeder, a crane, and a three-phase synchronous motor. The feeding hopper is connected to the screw feeder by bolts. The screw feeder is driven by the three-phase synchronous motor. The bottom of the feeding hopper is connected to the chassis mechanism by bolts. The outlet of the feeding hopper is connected to the feeding pipe through a transition flange. The feeding pipe alternately feeds materials to the first and second upper mixing tanks through a steering mechanism. The screw feeder is fixed to the mixing tank safety frame through a U-shaped slot connecting plate. The crane is fixed to the chassis mechanism through a crane mounting frame.

[0008] Preferably, a first upper stirring motor, a second upper stirring motor, and a lower stirring motor are respectively installed above the first upper stirring tank, the second upper stirring tank, and the lower stirring tank. The first upper stirring motor, the second upper stirring motor, and the lower stirring motor are fixed to the safety frame of the stirring tank by bolts. The first upper stirring motor, the second upper stirring motor, and the lower stirring motor are respectively connected to the stirring shaft through flanges. The stirring shaft extends into the first upper stirring tank, the second upper stirring tank, or the lower stirring tank, and a stirring rod is provided on the stirring shaft.

[0009] Preferably, the steering mechanism includes a transition cylinder and a rotating block. A tripod is provided on the two horizontal top beams of the mixing tank safety frame. A connecting rod is provided on the top of the tripod to fix the transition cylinder to the end of the connecting rod. A convex ring is provided on the upper end face of the rotating block along its circumference. The convex ring is located inside the transition cylinder, and an annular bearing is provided between the outer wall of the convex ring and the inner wall of the transition cylinder. The feeding pipe passes through the transition cylinder and the convex ring in sequence and extends into the inner cavity of the rotating block. A connecting pipe is provided inside the rotating block. The upper end of the connecting pipe is sleeved on the outer side of the lower end of the feeding pipe, and the lower end of the connecting pipe passes through the inner bottom wall of the rotating block and is threadedly connected to the inverted Z-shaped feeding pipe. The rotating block is driven by the rotating assembly to drive the inverted Z-shaped feeding pipe to rotate synchronously.

[0010] Preferably, the rotating component includes a disk fixed on the outer periphery of the rotating block. The upper end face of the disk is provided with a ring of arc-shaped teeth along its circumference. A drive motor is provided on the side wall of the tripod. The output shaft of the drive motor is connected to the rotating shaft of a bevel gear through a reducer. The bevel gear meshes with the arc-shaped teeth.

[0011] Preferably, the bottom of the transition cylinder, the contact surface between the rotating block and the inner bottom wall, and the contact surface between the upper end of the convex ring are all provided with ball bearings. The ball bearings are embedded in the annular surface of the bottom of the transition cylinder and the inner bottom wall. The outer wall of the annular bearing is fixed to the inner wall of the transition cylinder, and its inner wall is fixed to the outer wall of the convex ring. Preferably, the chassis mechanism includes a chassis body. The chassis body has wheel-covered vehicle platforms at both ends of its frame. The bottom of the wheel-covered vehicle platforms is provided with a weighing axle and a brake air chamber. The weighing axle is bolted to the brake air chamber. The weighing axle is fixed to a leaf spring by U-bolts. The leaf spring is welded to the frame. The front of the frame is connected to a towing hook by a pin. Telescopic support legs are installed on both sides of the main beam of the frame.

[0012] Preferably, the water supply mechanism includes a vehicle-mounted water tank and a centrifugal water pump. Both the vehicle-mounted water tank and the centrifugal water pump are fixed to the chassis mechanism by bolts. The outlet of the vehicle-mounted water tank is connected to the centrifugal water pump through an inlet pipe. The outlet of the centrifugal water pump is connected to a water supply pipe. The upper end of the water supply pipe is connected to a three-way water pipe. The outlet of the three-way water pipe is connected to the inlets of the first and second upper mixing tanks, respectively. A one-way valve is installed at the inlet of the centrifugal water pump.

[0013] Preferably, the mixer tractor further includes a pneumatic-electric control mechanism, which includes a microcontroller and a gravity sensor, an electromagnetic flowmeter, a water inlet pneumatic butterfly valve, a material outlet pneumatic butterfly valve, and a material outlet pneumatic butterfly valve electrically connected to the microcontroller. Two gravity sensors are provided and are respectively installed on the support legs of the first and second upper mixing tanks. The electromagnetic flowmeter is installed on the water inlet pipe. Two water inlet pneumatic butterfly valves are provided and are respectively installed on the two outlet pipes of the three-way water pipe. The material outlet pneumatic butterfly valve is installed at the outlet of the first and second upper mixing tanks, and the material outlet pneumatic butterfly valve is installed at the outlet of the lower mixing tank. The microcontroller is also electrically connected to a three-phase synchronous motor, a first upper mixing motor, a second upper mixing motor, a lower mixing motor, and a centrifugal water pump.

[0014] A mixing method for an automatic mixer truck, the mixing method comprising the following steps:

[0015] Step 1: Check the power supply. The microcontroller controls the centrifugal water pump to transport water from the vehicle-mounted water tank to the first and second upper mixing tanks. When the electromagnetic flow meter reaches the set value, close the pneumatic butterfly valve for water supply and start feeding materials.

[0016] Step 2: The crane, driven by its own motor, lifts and rotates the material to the top of the feeding hopper. The material then automatically falls into the feeding hopper. At this time, the microcontroller controls the three-phase synchronous motor to drive the screw feeder to convey the material to the feeder outlet. The material is then fed into the two mixing tanks through the steering mechanism. When the gravity sensor reaches the preset value, mixing begins.

[0017] Step 3: The microcontroller controls the first and second upper stirring motors to start the stirring operation. Under the action of the first and second upper stirring motors, the stirring rod rotates at different speeds. The stirring time signal is used as feedback to open the discharge pneumatic butterfly valve and discharge the stirred material into the lower stirring tank. At the same time, the lower stirring motor runs and the lower stirring rod performs the stirring operation. After the set time, the discharge pneumatic butterfly valve is opened and the material is discharged.

[0018] Step 4: According to the microcontroller program design, the feeding mechanism, steering mechanism and water supply mechanism start to operate in a cycle, working in conjunction with the upper and lower mixing tanks to achieve uninterrupted operation from mixing to discharge, until the required discharge amount is reached, at which point the operation can be stopped.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention utilizes a microcontroller program for automatic material feeding via a crane. A motor provides power for feeding and stirring. The variable frequency motor can adjust its speed according to stirring requirements. An on-board water tank can store a fixed amount of water, and a water pump provides power for water supply. An electromagnetic flow meter and a gravity sensor are used for measurement, and an air compressor provides the power source. This allows materials to be separately added to two mixing drums. After a limited stirring time, the butterfly valve automatically opens and closes, ensuring thorough mixing of water and materials. The entire process, from water supply and material feeding to material discharge, is fully automated.

[0021] 2. The automatic mixing tractor provides fully automated control from loading to unloading, significantly reducing the workload for operators. Simultaneous mixing of two mixing tanks via automatic program control improves mixing and discharge efficiency. High-precision flow meters and gravity sensors measure water and materials, precisely controlling the mixing ratio to ensure high-quality material mixing. Equipped with a towing chassis, it can be moved to any location for mixing operations.

[0022] 3. By controlling the drive motor through a single-chip microcomputer to achieve the rotation of the conical teeth and the arc teeth, the rotating block is driven to rotate synchronously, thereby realizing the direction of the inverted Z-shaped feeding pipe and thus realizing the alternating feeding of the first upper mixing tank and the second upper mixing tank. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the mixer tractor in this embodiment.

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0026] Figure 3 This is a left-side view of the mixer truck.

[0027] Figure 4 Front view of the mixer tractor

[0028] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0029] Figure 6 This is a cross-sectional view of the steering mechanism.

[0030] Figure 7 This is a schematic diagram of the meshing of a disk and a bevel gear.

[0031] Figure 8 This is a top view of a concrete mixer truck.

[0032] Figure 9 This is a right-side view of the mixer truck.

[0033] Figure 10 for Figure 9 Enlarged view of point C in the middle.

[0034] Figure 11 for Figure 9 Enlarged view of point D in the middle.

[0035] Figure 12 This is a bottom view of a concrete mixer truck.

[0036] Figure 13 This is a schematic diagram of the stirring shaft.

[0037] Figure 14 This is a cross-sectional view of the stirring shaft.

[0038] Among them, 1-chassis mechanism; 101-chassis body; 102-leaf spring; 103-load-bearing axle; 104-platform with wheel covers; 105-brake air tank; 106-telescopic support leg; 107-pin shaft; 108-traction hook; 2-mixing mechanism; 201-first upper mixing tank; 202-second upper mixing tank; 203-lower mixing tank; 204-mixing tank safety frame; 205-first upper mixing motor; 206-second upper mixing motor; 207-lower mixing motor; 208-mixing shaft; 3-feeding mechanism; 301-crane mounting frame; 302-feeding hopper; 303-crane; 304-screw feeder; 3 05-Three-phase synchronous motor; 306-Feeding pipe; 4-Water supply mechanism; 401-Vehicle-mounted water tank; 402-Centrifugal water pump; 403-T-shaped water pipe; 5-Pneumatic-electric control mechanism; 501-Air compressor; 502-Microcontroller; 503-Electromagnetic flow meter; 504-Water inlet pneumatic butterfly valve; 505-Discharge pneumatic butterfly valve; 6-Steering mechanism; 601-Transfer cylinder; 602-Rotating block; 6021-Inner cavity; 6022-Convex ring; 603-Disc; 6031-Arc-shaped teeth; 604-Inverted Z-shaped discharge pipe; 605-Tripod; 606-Drive motor; 607-Connecting rod; 608-Bearing; 609-Connecting pipe;

[0039] 7. Upper sleeve block; 8. Buffer cone cap; 9. Inverted cone cylinder; 10. Support rod; 11. Transition cone cap; 12. Lower sleeve block; 13. Horizontal connecting rod; 14. Stirring shaft; 15. Discharge hole. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] This embodiment provides an automatic concrete mixer tractor, which includes a mixing mechanism 2, a feeding mechanism 3, a water supply mechanism 4, and a pneumatic and electrical control mechanism 5 mounted on a chassis mechanism 1, as detailed below. Figure 1 As shown.

[0042] like Figure 2 and Figure 3 As shown, the stirring mechanism 2 includes a first upper stirring tank 201, a second upper stirring tank 202, and a lower stirring tank 203. The first upper stirring tank 201 and the second upper stirring tank 202 are mounted side by side on a stirring tank safety frame 204. The lower stirring tank 203 is located below the first upper stirring tank 201 and the second upper stirring tank 202. The lower stirring tank 203 and the stirring tank mounting frame are mounted on the chassis mechanism 1. A first upper stirring bar is respectively provided above the first upper stirring tank 201, the second upper stirring tank 202, and the lower stirring tank 203. The mixing motor 205, the second upper mixing motor 206, and the lower mixing motor 207 are bolted to the safety frame 204 of the mixing tank. The first upper mixing motor 205, the second upper mixing motor 206, and the lower mixing motor 207 are respectively connected to the mixing shaft 14 through flanges. The mixing shaft 14 extends into the first upper mixing tank 201, the second upper mixing tank 202, or the lower mixing tank 203. A mixing rod 208 is provided on the mixing shaft 14.

[0043] In this embodiment, the stirring rod 208 is improved, and its structure is as follows: Figure 13 and 14 As shown. An upper sleeve block 7 and a lower sleeve block 12 are fixed on the stirring shaft 14. A buffer cone cap 8 is provided on the outer wall of the upper sleeve block 7. The top of the buffer cone cap 8 is fixedly connected to the outer wall of the upper sleeve block 7. An inverted cone cylinder 9 is provided on the outside of the buffer cone cap 8, coaxial with it. A feeding area is formed between the inverted cone cylinder 9 and the buffer cone cap 8. A transition cone cap 11 is provided below the inverted cone cylinder 9. The upper end of the transition cone cap 11 is fixed on the inner wall of the buffer cone cap 8. Multiple support rods 10 are provided between the outer wall of the inverted cone cylinder 9 and the upper wall of the transition cone cap 11.

[0044] A horizontal connecting rod 13 is provided on the outside of the lower sleeve block 12. A stirring rod 14 is placed on the horizontal connecting rod 13, and the upper end of the stirring rod 14 located outside the horizontal connecting rod 13 abuts against the inner wall of the transition cone cap 11 and is fixedly connected to the inner wall of the transition cone cap 11.

[0045] Material passing through holes 15 are provided on the inverted cone 9 and the transition cone 11. Material conveyed by the inverted Z-shaped discharge pipe 604 flows from the inverted cone 9 and the buffer cone 8 into the discharge area, reaching the outer wall of the transition cone 11. Smaller pieces enter the mixing tank through the discharge holes 15. Due to the special structure of the transition cone 11, water splashed from the material falling through the discharge holes 15 will hit the inner wall of the transition cone 11, preventing splashing. Simultaneously, the inclined structure of the outer wall of the transition cone 11 reduces the falling speed of the material, achieving a slow descent into the water. Furthermore, the inverted cone 9 outside the buffer cone 8 provides some obstruction to the falling material, ensuring that all material falls from the discharge area onto the outer wall of the transition cone 11. This extends the material's descent path, achieving the purpose of preventing splashing.

[0046] Among them, the first upper stirring motor 205 and the second upper stirring motor 206 adopt a 7.5kw three-phase synchronous motor 305, which can control the speed through frequency conversion. Using variable speed stirring can make the materials better mixed. The first upper stirring tank 201 and the second upper stirring tank 202 adopt a bottom inclined design, which facilitates the mixing of the mixture and flows to the discharge port. The lower stirring motor 207 adopts a (12) 11kw three-phase synchronous motor 305. The lower stirring tank 203 plays the role of storing materials and preventing the materials from solidifying. Therefore, the motor does not need to be frequency converted. While stirring at a uniform speed, it discharges the mixed materials. At the same time, the bottom of the lower stirring tank 203 adopts a conical design, which facilitates the material to be concentrated to the discharge port and is easy to discharge.

[0047] In this embodiment, the first upper mixing tank 201 and the second upper mixing tank 202 are driven by AC variable frequency motors. The speed of the drive motor 606 is controlled by the frequency controller, which can make the mixing power strong and smooth alternating, with stable output and more thorough mixing effect. The lower discharge mixing tank is driven by a low-speed AC motor to ensure that the mixed product is not easy to solidify during the discharge process.

[0048] like Figure 1 and Figure 12 As shown, the chassis mechanism 1 includes a chassis body 101. The chassis body 101 is made of thickened rectangular steel welded together. Both wheel-covered vehicle platforms are made of 3mm spliced ​​steel plates welded to the (15) chassis as a whole. A weighing axle and a brake air bag 105 are provided at the bottom of the wheel-covered vehicle platform 104. The weighing axle and the brake air bag 105 are bolted together. The weighing axle is fixed to the leaf spring 102 by U-bolts. The leaf spring 102 is welded to the chassis to ensure the load-bearing capacity and shock absorption of the vehicle body. The front of the chassis is connected to the towing hook 108 by a pin 107. The towing hook 108 is also made of thickened square tube welded together and fixed by a pin 107 to ensure structural rigidity. At the same time, the towing hook 108 can rotate up and down by the pin 107 for easy towing.

[0049] The main beam of the base frame is equipped with telescopic support legs 106 on both sides, front and rear. When the equipment is pulled to the position where it needs to work, the support legs are extended through the lifting rod and fixed to the ground. This reduces the shaking of the equipment during the mixing operation and makes the equipment work stably.

[0050] In this embodiment, the chassis body 101 is welded with square steel to ensure chassis strength. It is equipped with a load-bearing axle 103 and large-size wheels. The leaf spring 102 is used to ensure good overall shock absorption of the equipment. The brake is an air brake, which is safe and reliable. When the equipment is running, the chassis is equipped with liftable outriggers to ensure the stability of the equipment operation. A triangular structure traction hook 108 is set at the front end of the equipment to ensure traction rigidity.

[0051] like Figure 4-7 As shown in Figure 10, the feeding mechanism 3 includes a feeding hopper 302, a screw feeder 304, a crane 303, and a three-phase synchronous motor 305. The feeding is achieved by using an 11kW three-phase synchronous motor 305 to drive the screw feeder 304, transporting the powdered material to the required mixing drum. The feeding hopper 302 is connected to the screw feeder 304 by bolts, and the bottom of the feeding hopper 302 is connected to the chassis by bolts. The screw feeder 304 is fixed to the mixing drum safety frame 204 using a U-shaped slot connecting plate, enhancing the stability of the feeding mechanism 3.

[0052] The starter motor is fixed to the mounting bracket 301 of the crane 303 by bolts, and the mounting bracket 301 of the crane 303 is fixed to the chassis by bolts. The crane 303 can lift ton bags with a maximum weight of 1 ton. Driven by its own motor, it lifts the material and rotates it to a position above the center of the feeding hopper 302. The material can automatically fall into the feeding hopper by simply cutting open the bottom of the ton bag, and then be automatically conveyed by the screw conveyor 304.

[0053] The feeding pipe 306 is connected to the outlet of the feeding machine through a transition flange, and the material is fed into the two mixing drums respectively through the steering mechanism 6.

[0054] like Figure 5-7As shown, the steering mechanism 6 includes a transition cylinder 601 and a rotating block 601. A tripod 605 is mounted on the two horizontal top beams of the mixing tank safety frame 204. A connecting rod 607 is mounted on the top of the tripod 605, fixing the transition cylinder 601 to the end of the connecting rod 607. A convex ring 6022 is provided on the upper surface of the rotating block 601 along its circumference. The convex ring 6022 is located inside the transition cylinder 601, and a space is provided between the outer wall of the convex ring 6022 and the inner wall of the transition cylinder 601. The ring bearing 608, the feeding pipe 306 passes through the transition cylinder 601 and the convex ring 6022 in sequence and extends into the inner cavity 6021 of the rotating block 601. The rotating block 601 is provided with a connecting pipe 608. The upper end of the connecting pipe 608 is sleeved on the outer side of the lower end of the feeding pipe 306. The lower end of the connecting pipe 608 passes through the inner bottom wall of the rotating block 601 and is threadedly connected to the inverted Z-shaped feeding pipe 604. The rotating block 601 is driven by the rotating assembly to drive the inverted Z-shaped feeding pipe 604 to rotate synchronously.

[0055] The rotating component includes a disk 603, which is fixed on the outer periphery of the rotating block 601. The upper surface of the disk 603 is provided with a ring of arc-shaped teeth 6031 along its circumference. A drive motor 606 is provided on the side wall of the tripod 605. The output shaft of the drive motor 606 is connected to the rotating shaft of a bevel gear through a reducer. The bevel gear meshes with the arc-shaped teeth 6031.

[0056] Among them, the bottom of the transition cylinder 601 and the contact surface between the rotating block 601 and the inner bottom wall and the upper end contact surface of the convex ring 6022 are provided with balls. The balls are embedded in the annular surface of the bottom of the transition cylinder 601 and the inner bottom wall. The outer wall of the annular bearing 608 is fixed to the inner wall of the transition cylinder 601, and its inner wall is fixed to the outer wall of the convex ring 6022.

[0057] Once the current mixing tank is fully loaded, the microcontroller 502 controls the drive motor 606, which, through the meshing of the bevel gear and the arc-shaped teeth 6031, drives the disc 603 to rotate. The rotating block 601 rotates synchronously, causing the inverted Z-shaped discharge pipe 604 to turn to another mixing tank. This achieves automated control.

[0058] In this embodiment, an AC motor is used to drive the material, which is transported by the screw feeder 304. The crane 303 is driven by the motor to lift the material ton bag to a suitable height and then rotates to the center position of the hopper of the feeding mechanism 3, so that the material falls into the hopper of the feeding mechanism 3. Then, the screw feeder 304 and the steering mechanism 6 transport the material to the mixing drum.

[0059] like Figure 4 and Figure 8 , Figure 9As shown, the water supply mechanism 4 includes a vehicle-mounted water tank 401 and a centrifugal water pump 402. Both the vehicle-mounted water tank 401 and the centrifugal water pump 402 are fixed to the chassis mechanism 1 by bolts. The centrifugal water pump 402 delivers water to the mixing drum.

[0060] The outlet of the vehicle-mounted water tank 401 is designed as a ball valve outlet and is connected to the centrifugal water pump 402 through the water inlet pipe. A one-way valve is installed at the water inlet of the centrifugal water pump 402 to prevent water backflow. The outlet of the centrifugal water pump 402 is connected to the water supply pipe, and the upper end of the water supply pipe is connected to the three-way water pipe 403. The outlet of the three-way water pipe 403 is connected to the water inlet of the first upper mixing tank 201 and the second upper mixing tank 202 respectively.

[0061] Both the inlet and outlet water pipes are DN65 galvanized water pipes, and the tee water pipe 403 is also a DN65 galvanized tee water pipe. A centrifugal water pump 402 is used for water supply, along with a large-capacity on-board water tank. Water is added to the mixing drum requiring agitation via an electromagnetic flow meter 503 and a pneumatic butterfly valve. The use of DN65 large-diameter water pipes ensures a rapid water supply.

[0062] like Figure 9 and Figure 11 As shown, the pneumatic control mechanism 5 includes a microcontroller 502, and a gravity sensor, an electromagnetic flowmeter 503, a water inlet pneumatic butterfly valve 504, a material outlet pneumatic butterfly valve, and a material outlet pneumatic butterfly valve 505, all electrically connected to the microcontroller 502.

[0063] The gravity sensor and electromagnetic flow meter 503 provide signal feedback to control the crane 303, centrifugal water pump 402, three-phase synchronous motor 305, first upper stirring motor 205, second upper stirring motor 206, and lower stirring motor 207. The solenoid valves are controlled by the microcontroller 502 program to control the action of the water inlet pneumatic butterfly valve 504, the material outlet pneumatic butterfly valve, and the material outlet pneumatic butterfly valve 505.

[0064] The system employs a microcontroller 502 to control the automatic program. When the electromagnetic flowmeter 503 reaches its set value, powder feeding begins. Once the gravity sensor reaches its predetermined value, the first and second upper stirring motors 205 and 206 begin stirring. Simultaneous stirring and feeding are achieved via a pneumatic butterfly valve 504. Depending on the required material, after a fixed stirring time, the pneumatic butterfly valve opens and closes to discharge the stirred material into the lower stirring tank 203. Simultaneously, the lower stirring motor 207 operates, and the lower stirring rod 208 performs stirring for the set time. Then, the discharge butterfly valve opens, and the material is discharged.

[0065] In the above process, the equipment is equipped with an air compressor as the air source, and the pneumatic system controls the opening and closing of the solenoid valve through a single-chip microcomputer program, thereby controlling the water inlet pneumatic butterfly valve, the discharge butterfly valve of the mixing drum, and the action of the feeding cylinder.

[0066] This embodiment also provides a mixing method for an automatic mixer tractor, which includes the following steps:

[0067] Step 1: Check the power supply. The microcontroller 502 controls the centrifugal water pump 402 to drive the water in the vehicle-mounted water tank 401 to the first upper mixing tank 201 and the second upper mixing tank 202. When the electromagnetic flowmeter 503 reaches the set value, close the water supply pneumatic butterfly valve 504 and start feeding materials.

[0068] Step 2: The crane 303, driven by its own motor, lifts and rotates the material above the feeding hopper 302. The material then automatically falls into the feeding hopper 302. At this time, the microcontroller 502 controls the three-phase synchronous motor 305 to drive the screw feeder to convey the material to the feeder outlet. The material is then fed into the two mixing tanks through the feeding hose. When the gravity sensor reaches the predetermined value, mixing begins.

[0069] Step 3: The microcontroller 502 controls the first upper stirring motor 205 and the second upper stirring motor 206 to start the stirring operation. Under the action of the first upper stirring motor 205 and the second upper stirring motor 206, the stirring rod 208 rotates at a variable speed. The stirring time signal is used as feedback to open the discharge pneumatic butterfly valve and discharge the stirred material into the lower stirring tank 203. At the same time, the lower stirring motor 207 runs. After the lower stirring rod 208 has carried out the stirring operation for the set time, the discharge pneumatic butterfly valve 505 is opened and the material is discharged.

[0070] Step 4: According to the microcontroller 502 program design, the feeding mechanism 3, the steering mechanism 6 and the water supply mechanism 4 start to operate in a cycle, working in conjunction with the upper mixing tank and the lower mixing tank 203 to achieve uninterrupted operation from mixing to discharge, until the required discharge amount is reached, at which point the operation can be stopped.

[0071] Through the 502 microcontroller program and feedback to the control system, the equipment achieves a high degree of automation in cyclic operation, strong stability, and precise quantitative measurement.

[0072] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An automatic mixer tractor, characterized in that, The concrete mixer tractor includes a mixing mechanism, a feeding mechanism, and a water supply mechanism mounted on the chassis. The feeding mechanism and the water supply mechanism supply materials and water to the mixing mechanism. The stirring mechanism includes a first upper stirring tank, a second upper stirring tank, and a lower stirring tank. The first upper stirring tank and the second upper stirring tank are mounted side by side on a stirring tank safety frame. The lower stirring tank is located below the first upper stirring tank and the second upper stirring tank. The lower stirring tank and the stirring tank mounting frame are mounted on a chassis mechanism. The feeding mechanism includes a feeding hopper, a screw feeder, a crane, and a three-phase synchronous motor. The feeding hopper is connected to the screw feeder by bolts. The screw feeder is driven by the three-phase synchronous motor. The bottom of the feeding hopper is connected to the chassis mechanism by bolts. The outlet of the feeding hopper is connected to the feeding pipe through a transition flange. The feeding pipe alternately feeds materials to the first and second upper mixing tanks through a steering mechanism. The screw feeder is fixed to the mixing tank safety frame through a U-shaped slot connecting plate. The crane is fixed to the chassis mechanism through a crane mounting frame. A first upper stirring motor, a second upper stirring motor, and a lower stirring motor are respectively installed above the first upper stirring tank, the second upper stirring tank, and the lower stirring tank. The first upper stirring motor, the second upper stirring motor, and the lower stirring motor are fixed to the safety frame of the stirring tank by bolts. The first upper stirring motor, the second upper stirring motor, and the lower stirring motor are respectively connected to the stirring shaft by flanges. The stirring shaft extends into the first upper stirring tank, the second upper stirring tank, or the lower stirring tank, and a stirring rod is provided on the stirring shaft. An upper sleeve block and a lower sleeve block are fixed on a stirring shaft. The outer wall of the upper sleeve block is provided with a buffer cone cap. The top of the buffer cone cap is fixedly connected to the outer wall of the upper sleeve block. An inverted cone cylinder coaxial with the buffer cone cap is provided on the outside of the buffer cone cap. A material feeding area is formed between the inverted cone cylinder and the buffer cone cap. A transition cone cap is provided below the inverted cone cylinder. The upper end of the transition cone cap is fixed to the inner wall of the buffer cone cap. Multiple support rods are provided between the outer wall of the inverted cone cylinder and the upper wall of the transition cone cap. A horizontal connecting rod is provided on the outside of the lower sleeve block. The stirring rod is set on the horizontal connecting rod, and the upper end of the stirring rod located outside the horizontal connecting rod abuts against the inner wall of the transition cone cap and is fixedly connected to the inner wall of the transition cone cap. A material passage hole is provided on the inverted cone and the transition cone cap. The steering mechanism includes a transition cylinder and a rotating block. A tripod is set on the two horizontal top beams of the mixing tank safety frame. A connecting rod is set on the top of the tripod to fix the transition cylinder to the end of the connecting rod. A convex ring along its circumference is set on the upper end face of the rotating block. The convex ring is located inside the transition cylinder, and an annular bearing is set between the outer wall of the convex ring and the inner wall of the transition cylinder. The feeding pipe passes through the transition cylinder and the convex ring in sequence and extends into the inner cavity of the rotating block. A connecting pipe is set inside the rotating block. The upper end of the connecting pipe is sleeved on the outer side of the lower end of the feeding pipe. The lower end of the connecting pipe passes through the inner bottom wall of the rotating block and is threadedly connected to the inverted Z-shaped feeding pipe. The rotating block is driven by the rotating assembly to drive the inverted Z-shaped feeding pipe to rotate synchronously. A horizontal bar is provided on the outer wall of the rotating block, and a support ring is provided at the lower end of the horizontal bar. The horizontal part of the inverted Z-shaped feed tube passes through the support ring.

2. The automatic mixer tractor according to claim 1, characterized in that, The rotating assembly includes a disk fixed on the outer periphery of the rotating block. The upper end face of the disk is provided with a ring of arc-shaped teeth along its circumference. A drive motor is provided on the side wall of the tripod. The output shaft of the drive motor is connected to the rotating shaft of a bevel gear through a reducer. The bevel gear meshes with the arc-shaped teeth.

3. An automatic mixer tractor according to claim 1, characterized in that, The bottom of the transition cylinder and the contact surface between it and the rotating block, as well as the contact surface between its inner bottom wall and the upper end of the convex ring, are all provided with balls. The balls are embedded in the annular surfaces of the bottom and inner bottom wall of the transition cylinder. The outer wall of the annular bearing is fixed to the inner wall of the transition cylinder, and its inner wall is fixed to the outer wall of the convex ring.

4. An automatic mixer tractor according to claim 1, characterized in that, The chassis mechanism includes a chassis body, with wheel-covered vehicle platforms at both ends of the chassis body's underframe. A weighing axle and a brake air chamber are located at the bottom of the wheel-covered vehicle platform. The weighing axle is bolted to the brake air chamber and fixed to a leaf spring by U-bolts. The leaf spring is welded to the underframe. The front of the underframe is connected to a towing hook by a pin, and telescopic support legs are installed on both sides of the main beam of the underframe.

5. An automatic mixer tractor according to claim 1, characterized in that, The water supply mechanism includes a vehicle-mounted water tank and a centrifugal water pump. Both the vehicle-mounted water tank and the centrifugal water pump are fixed to the chassis mechanism by bolts. The outlet of the vehicle-mounted water tank is connected to the centrifugal water pump through an inlet pipe. The outlet of the centrifugal water pump is connected to a water supply pipe. The upper end of the water supply pipe is connected to a three-way water pipe. The outlet of the three-way water pipe is connected to the inlet of the first and second upper mixing tanks, respectively. A one-way valve is installed at the inlet of the centrifugal water pump.

6. An automatic mixer tractor according to claim 5, characterized in that, The mixing tractor also includes a pneumatic-electric control mechanism, which includes a microcontroller and a gravity sensor, an electromagnetic flow meter, a water inlet pneumatic butterfly valve, a material outlet pneumatic butterfly valve, and a material outlet pneumatic butterfly valve electrically connected to the microcontroller. Two gravity sensors are provided and are respectively installed on the support legs of the first and second upper mixing tanks. The electromagnetic flow meter is installed on the water inlet pipe. Two water inlet pneumatic butterfly valves are provided and are respectively installed on the two outlet pipes of the three-way water pipe. The material outlet pneumatic butterfly valve is installed at the outlet of the first and second upper mixing tanks, and the material outlet pneumatic butterfly valve is installed at the outlet of the lower mixing tank. The microcontroller is also electrically connected to a three-phase synchronous motor, a first upper mixing motor, a second upper mixing motor, a lower mixing motor, and a centrifugal water pump.

7. A mixing method for an automatic mixer tractor according to any one of claims 1-6, characterized in that, The stirring method includes the following steps: Step 1: Check the power supply. The microcontroller controls the centrifugal water pump to transport water from the vehicle-mounted water tank to the first and second upper mixing tanks. When the electromagnetic flow meter reaches the set value, close the pneumatic butterfly valve for water supply and start feeding materials. Step 2: The crane, driven by its own motor, lifts and rotates the material to the top of the feeding hopper. The material then automatically falls into the feeding hopper. At this time, the microcontroller controls the three-phase synchronous motor to drive the screw feeder to convey the material to the feeder outlet. The material is then fed into the two mixing tanks through the steering mechanism. When the gravity sensor reaches the preset value, mixing begins. Step 3: The microcontroller controls the first and second upper stirring motors to start the stirring operation. Under the action of the first and second upper stirring motors, the stirring rod rotates at different speeds. The stirring time signal is used as feedback to open the discharge pneumatic butterfly valve and discharge the stirred material into the lower stirring tank. At the same time, the lower stirring motor runs and the lower stirring rod performs the stirring operation. After the set time, the discharge pneumatic butterfly valve is opened and the material is discharged. Step 4: According to the microcontroller program design, the feeding mechanism and water supply mechanism start to operate in a cycle, working in conjunction with the upper and lower mixing tanks to achieve uninterrupted operation from mixing to discharge, until the required discharge amount is reached, at which point the operation can be stopped.

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