Mixing equipment with concrete resistance sensing assembly

Abstract

The present invention discloses a mixing device with a concrete resistance sensor component, comprising a mounting seat, a fixed shaft is fixedly mounted on the top of the mounting seat, the fixed shaft is of hollow design, a main shaft is arranged inside the fixed shaft, a D-shaped shaft is fixedly mounted on one end of the main shaft, the D-shaped shaft passes through the mounting seat, a cylindrical mounting seat is dynamically sealed at the top of the fixed shaft, the other end of the main shaft passes through the fixed shaft and the cylindrical mounting seat at the same time, a bolt is threadedly connected on the outside of the main shaft and located above the cylindrical mounting seat, and a first water passage is opened on the top of the main shaft; in the mixer blade component, a flow meter is mounted on the upper end of the main shaft that is exposed upward above the bolt, and the flow meter has a water inlet and a water outlet. By using the pressure sensor component described in the present invention, real-time monitoring of the thinness and consistency of concrete can be achieved, and the amount of water reducing agent added to the concrete can be increased or decreased according to the thinness and consistency.

Description

Technical Field

[0001] The invention relates to the field of mixer accessories, in particular to a mixing device with a concrete resistance sensor component. Background Art

[0002] Concrete is one of the main engineering materials in civil engineering construction and is widely used in various civil engineering projects. However, the mining and use of raw materials for concrete consumes a lot of natural resources. The concrete industry is currently facing an unprecedented development crisis, which is mainly manifested in: (1) resource crisis. Concrete requires a large amount of natural aggregates, but natural aggregates are not inexhaustible; secondly, environmental crisis. The large amount of construction waste generated by concrete production occupies precious land and causes environmental pollution. Recycled concrete technology can not only solve the problem of waste concrete disposal, but also save natural sand and gravel. At the same time, it brings social benefits, economic benefits and environmental benefits. It is considered to be one of the main measures to develop green concrete and achieve sustainable development of building resources and environment.

[0003] In order to solve this problem, many scholars have proposed to use recycled aggregate to replace natural aggregate, and to use aeolian sand to replace river sand. However, the water absorption rate of recycled aggregate and aeolian sand is relatively high. After the concrete making process, the concrete slump is prone to be unqualified. CN112844094A provides a method for preparing mixer blades, but it is unable to monitor the resistance during concrete mixing in real time. In order to solve this problem, the present invention provides a concrete mixing blade assembly with a monitoring device, which can monitor the resistance generated during concrete mixing in real time. The staff can adjust the amount of water reducer within a certain range according to the resistance of the blade during mixing to avoid producing unqualified concrete. Summary of the invention

[0004] The object of the present invention is to provide a mixing device with a concrete resistance sensor assembly to solve the problem of a concrete mixing blade assembly with a monitoring device proposed in the above background technology. In the mixer blade assembly, the blade main shaft and the sensor housing are connected by a spline to transmit power. Four sensor slots are provided on each side of the sensor housing. According to the rotation direction of the blade, the pressure sensor is placed in two slots. When the blade rotates, the blade is subjected to resistance in the concrete and transmits the resistance to the pressure sensor. In order to avoid excessive eccentricity, two bearings are provided between the sensor housing and the rotating shaft. The bearings are connected to the sensor housing by adhesive. The sensor is provided with a built-in battery, which is transmitted to the mixer main control by wireless, and the resistance ratio is displayed on the mixer display screen. According to the display screen data, the water reducer is adjusted until it meets the requirements. A water tank is provided inside the main shaft, and a flow meter with a control device is installed on the top. It is controlled by the host to achieve automatic water addition and real-time monitoring of the water flow. The technical effect avoids the problem of excessive dust when the cover is opened after dry mixing.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A mixing device with a concrete resistance sensor assembly comprises a mounting seat, a fixed shaft is fixedly installed on the top of the mounting seat, the fixed shaft is of hollow design, a main shaft is arranged inside the fixed shaft, a D-shaped shaft is fixedly installed on one end of the main shaft, the D-shaped shaft passes through the mounting seat, a cylindrical mounting seat is dynamically sealed at the top of the fixed shaft, the other end of the main shaft passes through the fixed shaft and the cylindrical mounting seat at the same time, a bolt is threadedly connected to the outside of the main shaft and located above the cylindrical mounting seat, a first water channel is opened on the top of the main shaft, sensor housings are fixedly installed on both sides of the cylindrical mounting seat, a sensor housing bottom plate is fixedly installed on the bottom of the sensor housing, a second water channel is jointly opened between the two sensor housings and the cylindrical mounting seat, the first water channel is communicated with the second water channel, a rotating shaft is arranged inside the sensor housing, water outlets are opened at the bottom of the sensor housing and at both ends of the second water channel, and a fixing device is installed inside the water outlet A nozzle is provided, a flow meter is inserted into the interior of the first water passage, an electromagnetic valve is fixedly installed on the flow meter, a plurality of bolt holes are provided at the bottom of the sensor housing, blades are threadedly connected to the interior of the bolt holes, two inner grooves are provided inside the sensor housing, two outer convex keys are fixedly installed on the outer side of the rotating shaft, first limiting slots are provided on the sensor housing and at positions respectively communicating with the two inner grooves, second limiting slots are provided on the outer convex keys and at positions respectively communicating with the two inner grooves, a sensor assembly is provided inside the second limiting slot, the sensor assembly includes a housing, a spring and a pressure sensor, one end of the pressure sensor is tightly fitted with the first limiting slot, a spring is fixedly installed on one side of the pressure sensor, the housing is located on the outside of the spring and the pressure sensor at the same time, one end of the housing is inserted into the interior of the second limiting slot, and bearings are symmetrically provided on the inner wall of the sensor housing and at the position fitting with the rotating shaft.

[0007] As a further solution of the present invention: the rotating shaft is connected to the sensor housing via a spline.

[0008] As a further solution of the present invention: threaded holes are symmetrically provided on the mounting seat.

[0009] As a further solution of the present invention: the inner surface of the bearing shell contacting the rotating shaft is provided with a bearing alloy to reduce friction.

[0010] As a further solution of the present invention: the sensor housing uses a Z-shaped variable housing.

[0011] As a further solution of the present invention: the bearing shell and the sensor housing are bonded together by using glue.

[0012] As a further solution of the present invention: the stiffness of the spring is 10N / mm-50N / mm.

[0013] As a further solution of the present invention: the blades are arranged vertically as a whole.

[0014] As a further solution of the present invention: a plurality of oil storage grooves are provided on the bearing alloy on one side close to the rotating shaft.

[0015] As a further solution of the present invention: after the rotating shaft is subjected to concrete resistance, its rotation angle is limited to 0°-45°.

[0016] As a further solution of the present invention: the shell is a hollow bellows and is in an arc shape, and is in an arc shape as a whole.

[0017] As a further solution of the present invention: the surface roughness of the connecting portion between the rotating shaft and the sensor housing is 3.2 μm-6.3 μm.

[0018] As a further solution of the present invention: the cross-section of the bearing shell is also generally arc-shaped, and its radial thickness is 2mm-5mm.

[0019] As a further solution of the present invention: the pressure sensor has a wireless signal sending function, that is, it has a micro wireless transmission communication module inside, which transmits the sensed pressure digital signal to the mixer host via wireless signals.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the mixer blade assembly, a flow meter is installed at the upper end of the main shaft that is exposed upward above the bolt. The flow meter has a water inlet and a water outlet. By using the pressure sensor assembly described in the present invention, the consistency of the concrete can be monitored in real time, and the amount of the water reducing agent added to the concrete can be increased or decreased according to the consistency;

[0022] 2. The mixer blade assembly of the present invention can effectively prevent concrete from agglomerating and remaining on bolts and other parts because it is installed at the top of the mixer;

[0023] 3. In the mixer blade assembly, a sensor assembly for monitoring the real-time water flow added to the concrete is arranged inside the blade mixing shaft composed of a rotating shaft and a shaft sleeve. After the concrete raw materials are poured into the mixer, the amount of water required for the concrete can be adjusted through the mixer host control panel. After the mixing starts, there is no need to open the mixer cover again, which effectively avoids dust leakage;

[0024] 4. The devices described in the present invention are all detachable, wherein the blade part is the part most likely to produce concrete agglomeration, and the blade is connected to the detector housing through a thread, and can be disassembled for cleaning;

[0025] 5. When transmitting pressure to the rotating shaft, in order to avoid radial force caused by excessive eccentricity, two bearings are installed in the sensor housing to ensure sufficient coaxiality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a partial side cross-sectional view of the present invention.

[0028] Figure 3 It is a partial cross-sectional view of the present invention.

[0029] Figure 4 It is a structural cross-sectional view of the present invention.

[0030] Figure 5 It is a schematic structural diagram of the bearing bush of the present invention.

[0031] Figure 6 It is the installation schematic diagram of the present invention.

[0032] 1. Rotating shaft; 2. Sensor housing bottom plate; 3. Sensor housing; 4. Bolt; 5. Flow meter; 6. Main shaft; 7. Blade; 8. Nozzle; 9. Fixed shaft; 10. Bearing; 11. Sensor assembly; 111. Housing; 112. Spring; 113. Pressure sensor; 12. Bolt hole; 13. Mounting seat; 14. Water outlet; 15. Solenoid valve; 16. Cylindrical mounting seat; 17. First limiting slot hole; 18. D-type shaft; 19. Oil storage groove; 20. Threaded hole; 21. Bearing alloy; 22. External cam; 23. Internal groove; 24. Second limiting slot hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-6In the embodiment of the present invention, the mixing equipment with the concrete resistance sensor assembly includes a mounting seat 13, a fixed shaft 9 is fixedly mounted on the top of the mounting seat 13, the fixed shaft 9 is hollow, a main shaft 6 is arranged inside the fixed shaft 9, a D-shaped shaft 18 is fixedly mounted on one end of the main shaft 6, the D-shaped shaft 18 passes through the mounting seat 13, a cylindrical mounting seat 16 is dynamically sealed on the top of the fixed shaft 9, the other end of the main shaft 6 passes through the fixed shaft 9 and the cylindrical mounting seat 16 at the same time, a bolt 4 is threadedly connected to the outside of the main shaft 6 and located above the cylindrical mounting seat 16, the main shaft 6 is fixedly mounted on the top of the fixed shaft 9, and a D-shaped shaft 18 passes through the mounting seat 13, and a cylindrical mounting seat 16 is dynamically sealed on the top of the fixed shaft 9. The other end of the main shaft 6 passes through the fixed shaft 9 and the cylindrical mounting seat 16 at the same time, and a bolt 4 is threadedly connected to the outside of the main shaft 6 and located above the cylindrical mounting seat 16. A first water passage is provided at the top of the shaft 6, sensor housings 3 are fixedly mounted on both sides of the cylindrical mounting seat 16, a sensor housing bottom plate 2 is fixedly mounted at the bottom of the sensor housing 3, a second water passage is provided between the two sensor housings 3 and the cylindrical mounting seat 16, the first water passage is communicated with the second water passage, a rotating shaft 1 is provided inside the sensor housing 3, a water outlet 14 is provided at the bottom of the sensor housing 3 and at both ends of the second water passage, a nozzle 8 is fixedly mounted inside the water outlet 14, and the first water passage is provided at the bottom of the sensor housing 3. A flow meter 5 is inserted into the interior of the sensor housing 3, and a solenoid valve 15 is fixedly installed on the flow meter 5. A plurality of bolt holes 12 are provided at the bottom of the sensor housing 3, and blades 7 are threadedly connected to the inner surfaces of the bolt holes 12. Two inner grooves 23 are provided inside the sensor housing 3, and two outer convex keys 22 are fixedly installed on the outer side of the rotating shaft 1. First limiting slots 17 are provided on the sensor housing 3 and are respectively communicated with the two inner grooves 23. Second limiting slots 24 are provided on the outer convex keys 22 and are respectively communicated with the two inner grooves 23. A sensor assembly 11 is arranged inside the second limiting slot 24, and the sensor assembly 11 includes a shell 111, a spring 112 and a pressure sensor 113. One end of the pressure sensor 113 is tightly fitted with the first limiting slot 17, and the spring 112 is fixedly installed on one side of the pressure sensor 113. The shell 111 is located on the outside of the spring 112 and the pressure sensor 113 at the same time, and one end of the shell 111 is inserted into the second limiting slot 24. The inner wall of the sensor shell 3 and the position where the shaft 1 is fitted are symmetrically provided with bearings 10.

[0035] The rotating shaft 1 is connected to the sensor housing 3 via a spline.

[0036] The mounting seat 13 is symmetrically provided with threaded holes 20 .

[0037] The inner surface of the bearing bush 10 contacting the rotating shaft 1 is provided with a bearing alloy 21 to reduce friction.

[0038] The sensor housing 3 uses a Z-shaped variable housing.

[0039] The bearing bush 10 and the sensor housing 3 are bonded together by glue.

[0040] The stiffness of the spring 112 is 10 N / mm to 50 N / mm.

[0041] The blade assembly is arranged vertically as a whole.

[0042] A plurality of oil storage grooves 19 are formed on the bearing alloy 21 and on one side close to the rotating shaft 1 .

[0043] After the rotating shaft 1 is subjected to the resistance of concrete, its rotation angle is limited to 0°-45°.

[0044] The outer shell 111 is a hollow bellows and is in an arc shape, and is generally in an arc shape.

[0045] The surface roughness of the connecting portion between the rotating shaft 1 and the sensor housing 3 is 3.2 μm-6.3 μm.

[0046] The cross section of the bearing shell 10 is also generally arc-shaped, and its radial thickness is 2mm-5mm.

[0047] The pressure sensor 113 has a built-in wireless signal transmission function, that is, it has a micro wireless transmission communication module inside, which transmits the sensed pressure digital signal to the mixer host via a wireless signal.

[0048] The present invention uses threaded fasteners to fix the blade assembly directly below the rotating shaft 1, and installs the flow meter 5 on the shaft hole provided in the cylindrical mounting seat tube through bolts 4. The internal thread provided in the shaft hole and the external thread provided on the bolt are tightly matched with each other.

[0049] The working principle of the present invention is:

[0050] During installation, first fix the fixed shaft 9 to the bottom of the concrete mixer, then place the main shaft 6 in the fixed shaft 9 and connect the mixer's motor to the bottom D-shaped shaft through a transmission device. The fixed shaft 9 is in the shape of a hollow tube to form a shaft-penetrating pipe that runs through its body, and then install the mixing shaft at the upper end of the fixed shaft, install the sensor assembly 11 and the bearing 10 in the mixing shaft, first place the sensor assembly 11 in the inner groove 23 of the sensor housing 3, after the rotating shaft 1 and the sensor housing 3 are installed, the sensor housing bottom plate 2 and the sensor housing 3 are fixed together with bolts to form a shaft sleeve, and then the blade 7 is fixed to the bolt hole opened at the bottom of the sensor housing through threads and bolts, and the cylindrical mounting seat is penetrated with an axis hole, and finally the nozzle 8 is installed between the 2 sensor housing bottom plates The center of the rotating shaft is fixed with a cylindrical mounting seat, and a through hole is provided in the cylindrical mounting seat tube. The fixed shaft 9 is in the shape of a hollow tube. The rotating shaft (including the shaft sleeve formed by the sensor housing bottom plate 2 and the sensor housing) is installed on the upper end of the fixed shaft through its cylindrical mounting seat. Specifically, the cylindrical mounting seat is installed on the pipe mouth at the upper end of the fixed shaft 9, and the axial hole provided in the cylindrical mounting seat tube is sealed and fixedly connected with the pipe mouth at the upper end of the fixed shaft 9 in a relatively central manner. The main shaft passes through the cylindrical mounting seat and the fixed shaft through the axial hole and the through-shaft pipeline. The main shaft cooperates with the fixed shaft dynamic seal in a manner of rotating around its own central axis, that is, the outer circumference of the main shaft cooperates with the inner circumference of the fixed shaft in a manner of rotating around its own central axis, and the cylindrical mounting seat cooperates with the fixed shaft dynamic seal in a manner of rotating around its own central axis. Matching, that is, the end face of the pipe mouth at the bottom end of the cylindrical mounting seat is dynamically sealed with the end face of the pipe mouth at the top end of the fixed axis in a manner of rotating around its own central axis. The stirring shaft is fixedly assembled with the main shaft through splines. The flow meter is inserted into the shaft hole through bolts 4 and threads, and then fixed on the cylindrical mounting seat. The lower end of the main shaft is fixed with a D-shaped shaft (that is, the outer edge line of the cross-section of the D-shaped shaft is generally D-shaped) which is externally arranged from the lower end of the fixed axis pipe mouth. A water inlet channel extending along the length direction of the main shaft is opened in the upper end of the main shaft. A water outlet and a nozzle are respectively installed at the bottom of the bottom plate 2 of the sensor housing. The nozzle is installed on the water outlet through threads, and the water spray hole of the nozzle is arranged downward. The second section of the water outlet channel extending along the length direction of the rotating shaft is arranged inside the part of the rotating shaft which is symmetrical with the cylindrical mounting seat as the central axis. The two sections of water outlet channels are symmetrical with the cylindrical mounting seat as the central axis, and the water outlet holes are correspondingly connected to the second section of the water outlet channel. The second section of the water outlet channel is fixedly sealed and connected to the nozzle. The part inside the upper part of the main shaft that is symmetrical with the water inlet channel as the central axis is provided with a first section of the water outlet channel extending along the length direction of the rotating shaft. The first section of the water outlet channel is symmetrically arranged with the water inlet channel as the central axis. The water outlet at the bottom of the flowmeter is fixedly extended into the upper end of the main shaft, that is, the water outlet at the bottom of the flowmeter is fixedly installed in the water inlet of the water inlet channel located at the upper end of the main shaft through a threaded seal, and is simultaneously fixedly sealed and connected to the water outlet channel through the water inlet channel. The water outlet channel is fixedly sealed and connected to the nozzle. The water inlet arranged at the upper end of the flowmeter itself is dynamically sealed and connected to the water outlet of the vertically set water supply pipe, that is, the water outlet of the water supply pipe is arranged vertically downward.When the power output device of the mixer drives the mixing shaft to rotate around the center of the water inlet channel through the transmission device and the D-axis, the flow meter itself rotates together with the main shaft, etc., and the fixed shaft fixed at the bottom of the mixing barrel does not rotate, and the water outlet of the water supply pipe is also fixed. Therefore, the water inlet set at the top of the flow meter itself will always cooperate with the dynamic seal of the water outlet of the water supply pipe in a self-rotating manner. The flow meter itself is an existing commercially available flow sensor with an electromagnetic switch valve, which has the functions of measuring the current water flow that flows through the inlet and outlet pipes and nozzles in sequence and sprayed onto the concrete, and opening or closing the water outlet and the inlet and outlet pipes of the water supply pipe. Therefore, the flow meter can also play the role of a switch valve. The electromagnetic switch valve in the flow meter is controlled by an electromagnetic relay linked to it. The host controls the opening or closing of the built-in solenoid valve in the flow meter through the electromagnetic relay according to the flow data signal sent back by the flow meter via the wire. A through-shaft hole is provided at the center of the bottom of the mixing barrel, and the fixing seat fixed at the lower end of the fixed shaft is installed at the center of the inner bottom surface of the mixing barrel through threaded holes and threaded fasteners, and cooperates with the inner bottom surface of the mixing barrel to prevent concrete, water, etc. from seeping downward to the outside of the mixing barrel through the gap between the mounting seat and the inner bottom surface of the mixing barrel and the through-shaft hole. The fixed shaft is completely installed in the mixing barrel, and the main shaft extends from the bottom end of the fixed shaft. The D-shaped shaft fixed at the bottom passes through the bottom of the mixing barrel through the through-shaft hole and extends to the bottom of the mixing barrel. The diameter of the through-shaft hole should be larger than the maximum diameter of the D-shaped shaft, so that the D-shaped shaft can rotate freely without being hindered by the through-shaft hole, and the mixer can freely drive the mixing shaft to rotate through the transmission equipment and the D-shaped shaft. Fill the prepared concrete into the mixing barrel of the mixer, connect the water inlet of the water pump to the water source through the water pumping pipe in advance, connect the water outlet of the water pump to the water inlet opened on the upper end of the flow meter through the water outlet pipe and the water supply pipe dynamic seal, then start the mixer, the power output device of the mixer rotates around the center of the water inlet channel through the driving device and the main shaft, spline and drive the mixing shaft. Since the fixed shaft is fixed at the bottom of the mixing barrel, the fixed shaft is fixed and does not rotate, while the rotating shaft rotates relative to the rotating shaft. The fixed shaft plays a role in protecting the main shaft to prevent concrete, water, etc. from directly contacting the main shaft. The main body of the blade fixed on the mixing shaft is placed in the concrete, and the concrete is dry mixed in a corresponding manner in a revolution. The mixing shaft and the nozzle are kept suspended and fixed. The water pump is fixed above the concrete. The water from the water source is pumped through the water outlet pipe, water supply pipe, flow meter, water inlet channel, water outlet channel and nozzle pump to the concrete being mixed by the blades. Since the mass of the concrete being mixed by the blades is a known number, the mixer computer host can automatically calculate the set total water volume that needs to be added to the concrete based on the known concrete weight, and immediately control the electromagnetic switch valve in the meter to open through the relay. The flow meter can measure the real-time cumulative water volume flowing through the inside of the electromagnetic switch valve, the water inlet and outlet channels and the nozzle to the concrete being dry-mixed by the blades. When the computer calculates that the real-time cumulative water volume is equal to the set total water volume, the electromagnetic switch valve in the meter is closed through the relay control.At the same time, the mixer computer host controls the water pump to stop, and the mixer continues to mix the concrete and the water sprayed from the nozzle onto the concrete. When the mixer drives the agitator shaft to rotate through the transmission equipment, D-type shaft and spline, the blades will revolve around the center of the water inlet channel, and the blade body will be immersed in the concrete slurry mixed with concrete and water. The agitator shaft, nozzle, bolts, etc. are suspended above the concrete. When the blades mix the concrete slurry, the greater the resistance of the concrete, the greater the consistency of the concrete. The consistency of the concrete is positively correlated to the resistance of the blades to the concrete (the elastic force of the spring or the torque of the sleeve), then the pressure electrical signal number sensed by the pressure sensor The larger the value is, the mixer computer host collects and calculates the resistance data B sensed by the sensor. When the calculated value resistance ratio (BA) / A displayed on the mixer computer host control panel display screen is larger, it means that the consistency of the concrete is higher. When the resistance ratio (BA) / A is smaller, it means that the consistency of the water-mixed concrete with a certain raw material ratio is lower. Therefore, the amount of water-reducing agent added to the mixing barrel can be calculated according to the current consistency of the water-mixed concrete. That is, when the consistency of the water-mixed concrete with a certain raw material ratio increases, the amount of water-reducing agent added to the concrete should be increased appropriately. When the consistency decreases, the amount of water-reducing agent added to the concrete should be reduced appropriately. When the viscosity of concrete is too high, it is necessary to add an appropriate amount of water to the concrete. At this time, it is necessary to open the solenoid valve in the flow meter and start the water pump at the same time, so that the water pump can finally flow an appropriate amount of water into the concrete through the inlet and outlet pipes and nozzle pump. When the water measured by the flow meter reaches an appropriate amount, immediately close the solenoid valve in the flow meter and stop the water pump at the same time. On the contrary, the lower the viscosity of the concrete, the more appropriate amount of water reducer needs to be added to the mixing barrel.

[0051] The original technical solution of the present invention:

[0052] The purpose of the present invention is to provide a mixing device with a concrete resistance sensor component (a concrete mixing blade component with a concrete resistance monitoring device). In the mixer blade component, the blade main shaft and the sensor housing are connected by a spline to transmit power. Four sensor slots are provided on each side of the sensor housing. According to the rotation direction of the blade, the pressure sensor is placed in two slots. When the blade rotates, the blade is subjected to resistance in the concrete and transmits the resistance to the pressure sensor. In order to avoid excessive eccentricity, two bearings are provided between the sensor housing and the rotating shaft. The bearings are connected to the sensor housing by adhesive. The sensor is provided with a built-in battery, which is transmitted to the mixer main control by wireless, and the resistance ratio is displayed on the mixer display screen. According to the display screen data, the water reducer is adjusted until it meets the requirements. A water tank is provided inside the main shaft, and a flow meter with a control device is installed on the top. It is controlled by the host to achieve automatic water addition and real-time monitoring of water flow. The technical effect avoids the problem of opening the cover after dry mixing and excessive dust.

[0053] To achieve the above-mentioned purpose, the present invention provides the following scheme: the sensor housing uses a Z-shaped variable housing. The bearing and the housing are bonded by glue. The main shaft and the sensor housing are driven by splines (external convex keys). The spring stiffness of the sensor is 10N / mm-50N / mm. The blade assembly is arranged vertically as a whole. The blades and each component are connected by threads. A layer of bearing alloy is provided on the inner surface of the bearing contacting the shaft to reduce friction. An oil storage groove is provided on the inner surface of the bearing contacting the shaft to store lubricating oil, and the lubricating oil is replenished between the bearing and the shaft in time. The lubricating oil basically covers the outer peripheral surface of the shaft through its own certain adhesion and the revolution of the bearing around the shaft, lubricating the shaft in time, maintaining the wet friction between the bearing and the shaft, and reducing the sliding friction between the bearing and the shaft. After the shaft is subjected to concrete resistance, its rotation angle is limited to 0°-45°.

[0054] The shaft sleeve and the shaft 1 built into the shaft sleeve rotate coaxially. The larger the angle of the shaft sleeve relative to the shaft, the smaller the angle of compression of the overall arc-shaped spring (the spring in the sensor assembly) and the smaller the arc length, the greater the elastic force to restore the original state and the torque received by the shaft sleeve, and the greater the spring pressure sensed by the built-in pressure sensor. The housing and the spring are installed on Figure 2 In the inner groove provided in the sensor housing / sleeve shown, the spring is arranged in the housing, the inner groove is in the shape of an arc and is symmetrically arranged with the center line of the rotating shaft, a first limiting slot is arranged in one end face of the inner groove, an external convex key is arranged on the outer peripheral surface of the rotating shaft, the cross-section of the external convex key is in the shape of an arc and is symmetrically arranged with the center line of the rotating shaft, a second limiting slot is arranged on one side of the external convex key, the sensor assembly (including the housing, the spring and the pressure sensor), the housing is a hollow bellows as a whole and is in the shape of an arc, and the overall shape is in the shape of an arc, one end of which is inserted in the first limiting slot, and the other end of which is inserted in the second limiting slot, the pressure sensor is installed in the first limiting slot or the second limiting slot, and the pressure sensor is arranged in one end of the housing as a whole and is pressed and matched with the spring.

[0055] The surface roughness of the connection portion between the rotating shaft and the sensor housing is 3.2 μm-6.3 μm.

[0056] The cross section of the bearing shell is also generally arc-shaped, and its radial thickness is 2mm-5mm.

[0057] The sensor has a built-in wireless signal transmission function, that is, it has a micro wireless transmission communication module inside, which transmits the sensed pressure digital signal to the mixer host via wireless signals.

[0058] Compared with the prior art, the present invention has achieved the following beneficial technical effects: ① In the mixer blade assembly of the present invention, a flow meter is installed at the upper end of the main shaft exposed upward above the bolt, and the flow meter has a water inlet and a water outlet. By using the pressure sensor assembly described in the present invention, the consistency of concrete can be monitored in real time, and the amount of water reducer added to the concrete can be increased or decreased according to the consistency. ② Since the installation position of the mixer blade assembly of the present invention is located at the top of the mixer, it can effectively avoid the bolts and other components remaining in the mixer blade assembly after the concrete agglomerates. ③ In the mixer blade assembly of the present invention, a sensor assembly for monitoring the water flow added to the concrete in real time is arranged in the blade mixing shaft composed of a rotating shaft and a sleeve (the sleeve is composed of a sensor housing bottom plate (upper sleeve housing) and a sensor housing (lower sleeve housing)). After the concrete raw materials are poured into the mixer, the amount of water required for the concrete can be adjusted through the mixer host control panel. After the mixing starts, there is no need to open the mixer cover again, which effectively avoids the leakage of dust. ④ All the equipment constituting the present invention can be disassembled, among which the blade part is the part most likely to produce concrete lumps. The blade is connected to the detector housing through a thread and can be disassembled for cleaning. ⑤ When the resistance of the concrete (the elastic force of the spring or the torque of the sleeve) received by the blade of the present invention is converted into pressure and transmitted to the rotating shaft, in order to avoid the rotating shaft from generating excessive eccentric radial force, two bearings are installed in the sensor housing to ensure that the rotating shaft and the sleeve have sufficient coaxiality.

[0059] In a specific embodiment of the present invention, before using the mixer blade assembly of the present invention, the sensor data in the assembly should be calibrated. After the mixer blade assembly is installed in the mixer, a sufficient amount of water is poured into the mixer, and the mixer is started. The sensor data is collected to obtain the pressure sensing data for pure water and set it to 0. The data displayed on the screen is dimensionless data. Assume that the resistance for pure water is A and the resistance during operation is B. The screen display is (BA) / A.

[0060] In order to automatically control the water switch, the flow meter contains a solenoid valve controlled by a relay to act as a switch. When the solenoid valve is energized, water can flow through the flow meter. When the solenoid valve loses power, it is in the cut-off state.

[0061] There are four annular inward grooves in the sensor housing and the rotating shaft for placing the sensor assembly. The resistance during stirring is transmitted to the rotating shaft through the blades, forming a certain torque, which is transmitted to the pressure sensor assembly, triggering the rotation angle of the spring and transmitting the pressure value to the pressure sensor.

[0062] The structure of the mixer blade assembly of the present invention is shown in the accompanying drawings ( Figure 1-Figure 6), when installing the mixer blade assembly, first fix the fixed shaft to the bottom of the concrete mixer, then place the main shaft in the fixed shaft (hollow shaft) and connect the mixer motor to the bottom D-type shaft through a transmission device (torque transmission device, such as a reducer, etc.). The fixed shaft is in the shape of a hollow tube to form a shaft-penetrating pipe that runs through its body, and then install the mixing shaft on the upper end of the fixed shaft, install the sensor assembly and the bearing bush in the mixing shaft, first place the sensor assembly in the inner groove of the sensor housing, after the rotating shaft and the sensor housing are installed, the sensor housing bottom plate and the sensor housing are fixed together with bolts to form a shaft sleeve, and then the blades are fixed to the bolt holes opened at the bottom of the sensor housing through threads and bolts, and the cylindrical mounting seat is penetrated with a shaft hole, and finally The nozzle is installed under the bottom plate of the sensor housing, and a cylindrical mounting seat is fixedly installed at the center of the rotating shaft. A through hole is opened in the cylindrical mounting seat tube, and the fixed shaft is in the shape of a hollow tube. The rotating shaft (including the shaft sleeve formed by the bottom plate of the sensor housing and the sensor housing) is installed as a whole on the upper end of the fixed shaft through its cylindrical mounting seat. Specifically, the cylindrical mounting seat is installed on the pipe mouth at the upper end of the fixed shaft, and the axial hole opened in the cylindrical mounting seat tube is sealed and fixedly connected with the pipe mouth at the upper end of the fixed shaft in a relatively central manner. The main shaft passes through the cylindrical mounting seat and the fixed shaft through the axial hole and the through-shaft pipe. The main shaft cooperates with the fixed shaft dynamic seal in a manner of rotating around its own central axis, that is, the outer circumference of the main shaft cooperates with the inner circumference of the fixed shaft in a manner of rotating around its own central axis. The cylindrical mounting seat rotates around its own central axis. The method of self-rotation cooperates with the fixed axis dynamic seal, that is, the end face of the pipe mouth at the bottom end of the cylindrical mounting seat rotates around its own central axis and cooperates with the end face of the pipe mouth at the top end of the fixed axis in a dynamic seal. The stirring shaft is fixedly assembled with the main shaft through splines. The flow meter is inserted into the shaft hole through bolts and threads, and then fixed on the cylindrical mounting seat. The lower end of the main shaft is fixed with a D-shaped shaft (that is, the outer edge line of the cross section of the D-shaped shaft is generally D-shaped) which is externally arranged from the lower end of the fixed axis pipe mouth. The upper end of the main shaft is provided with a water inlet channel extending along the length direction of the main shaft. A water outlet and a nozzle are respectively installed at the bottom of the bottom plate of the sensor housing. The nozzle is installed on the water outlet through threads, and the water spray hole of the nozzle is arranged downward. The part of the rotating shaft symmetrical with the cylindrical mounting seat as the central axis is provided with a water inlet channel extending along the length direction of the rotating shaft. The second section of the extended water outlet channel is symmetrical with the cylindrical mounting seat as the central axis, the water outlet hole is correspondingly connected to the second section of the water outlet channel, the second section of the water outlet channel is fixedly sealed and connected to the nozzle, and the part of the upper part of the main shaft that is symmetrical with the water inlet channel as the central axis is provided with the first section of the water outlet channel extending along the length direction of the rotating shaft, the first section of the water outlet channel is symmetrically arranged with the water inlet channel as the central axis, the water outlet at the bottom of the flowmeter is fixedly extended into the upper end of the main shaft, that is, the water outlet at the bottom of the flowmeter is fixedly installed in the water inlet of the water inlet channel located at the upper end of the main shaft through a threaded seal, and is simultaneously fixedly sealed and connected to the water outlet channel through the water inlet channel, the water outlet channel is fixedly sealed and connected to the nozzle, the water inlet provided at the upper end of the flowmeter itself is dynamically sealed and connected to the water outlet of the vertically set water supply pipe,That is, the outlet of the water supply pipe is set vertically downward. When the power output device of the mixer drives the mixing shaft to rotate around the center of the water inlet channel through the transmission device and the D-type shaft, the flow meter itself rotates together with the main shaft, etc., and the fixed shaft fixed at the bottom of the mixing barrel does not rotate, and the outlet of the water supply pipe is also fixed. Therefore, the water inlet set at the top of the flow meter itself will always cooperate with the outlet dynamic seal of the water supply pipe in a self-rotating manner. The flow meter itself is an existing commercially available flow sensor with an electromagnetic switch valve. It has the functions of measuring the current water flow that flows through the inlet and outlet pipes and nozzles in sequence and sprays onto the concrete, and opening or closing the outlet and inlet and outlet pipes of the water supply pipe. Therefore, the flow meter can also play the role of a switch valve. The electromagnetic switch valve in the flow meter is controlled by an electromagnetic relay connected to it. The host controls the electromagnetic valve built into the flow meter to open or close through the electromagnetic relay according to the flow data signal sent back by the wired flow meter. ,

[0063] A through-shaft hole is provided at the center of the bottom of the mixing barrel, and the fixing seat fixed at the lower end of the fixed shaft is installed at the center of the inner bottom surface of the mixing barrel through threaded holes and threaded fasteners, and cooperates with the inner bottom surface of the mixing barrel to prevent concrete, water, etc. from seeping downward to the outside of the mixing barrel through the gap between the mounting seat and the inner bottom surface of the mixing barrel and the through-shaft hole. The fixed shaft is completely installed in the mixing barrel, and the main shaft extends from the bottom end of the fixed shaft. The D-shaped shaft fixed at the bottom passes through the bottom of the mixing barrel through the through-shaft hole and extends to the bottom of the mixing barrel. The diameter of the through-shaft hole should be larger than the maximum diameter of the D-shaped shaft, so that the D-shaped shaft can rotate freely without being hindered by the through-shaft hole, and the mixer can freely drive the mixing shaft to rotate through the transmission equipment and the D-shaped shaft.

[0064] Fill the prepared concrete into the mixing barrel of the mixer, connect the water inlet of the water pump to the water source through the water pumping pipe in advance, connect the water outlet of the water pump to the water inlet opened on the upper end of the flow meter through the water outlet pipe and the water supply pipe dynamic seal, then start the mixer, the power output device of the mixer rotates around the center of the water inlet channel through the driving device and the main shaft, spline and drive the mixing shaft. Since the fixed shaft is fixed at the bottom of the mixing barrel, the fixed shaft is fixed and does not rotate, while the rotating shaft rotates relative to the rotating shaft. The fixed shaft plays a role in protecting the main shaft to prevent concrete, water, etc. from directly contacting the main shaft. The main body of the blade fixed on the mixing shaft is placed in the concrete, and the concrete is dry mixed in a corresponding manner of revolution. The mixing shaft and the spraying The nozzle is kept suspended and fixed above the concrete. The water pump pumps water from the water source through the water outlet pipe, water supply pipe, flow meter, water inlet channel, water outlet channel and nozzle pump to the concrete being mixed by the blades. Since the mass of concrete mixed by the blades is a known number, the mixer computer host can automatically calculate the set total water volume that needs to be added to the concrete based on the known concrete weight, and immediately control the electromagnetic switch valve in the meter to open through the relay. The flow meter can measure the real-time cumulative water volume flowing through the electromagnetic switch valve, the water inlet and outlet channels and the nozzle to the concrete being dry-mixed by the blades. When the computer calculates that the real-time cumulative water volume is equal to the set total water volume, it controls the relay to open. The electromagnetic switch valve in the meter is closed, and the mixer computer host controls the water pump to stop at the same time. The mixer continues to mix the concrete and the water sprayed from the nozzle to the concrete. When the mixer drives the mixing shaft to rotate through the transmission equipment, D-type shaft and spline, the blades will revolve around the center of the water inlet channel, and the main body of the blade will be immersed in the concrete slurry mixed with concrete and water. The mixing shaft, nozzle, bolts, etc. are suspended above the concrete. When the blade mixes the concrete slurry, the greater the resistance of the concrete, the greater the consistency of the concrete. The consistency of the concrete is positively correlated to the resistance of the blade to the concrete (the elastic force of the spring or the torque of the sleeve). Then the pressure sensed by the pressure sensor The larger the value of the electrical signal, the mixer computer (computer) collects and calculates the resistance data B sensed by the sensor. When the calculated resistance ratio (BA) / A displayed on the mixer computer control panel display screen is larger, it means that the consistency of the concrete is higher. When the resistance ratio (BA) / A is smaller, it means that the consistency of the water-mixed concrete with a certain raw material ratio is lower. Therefore, the amount of water-reducing agent added to the mixing barrel can be calculated according to the current consistency of the water-mixed concrete. That is, when the consistency of the water-mixed concrete with a certain raw material ratio increases, the amount of water-reducing agent added to the concrete should be increased appropriately. When the consistency decreases, the amount of water-reducing agent added to the concrete should be reduced appropriately.

[0065] When the viscosity of concrete is too high, it is necessary to add an appropriate amount of water to the concrete. At this time, it is necessary to open the solenoid valve in the flow meter and start the water pump at the same time, so that the water pump can finally pump an appropriate amount of water into the concrete through the inlet and outlet pipes and nozzle pumps. When the water measured by the flow meter reaches an appropriate amount, immediately close the solenoid valve in the flow meter and stop the water pump at the same time. Conversely, the lower the viscosity of the concrete, the more appropriate amount of water reducer needs to be added to the mixing barrel.

[0066] The pressure sensor assembly adopts a flexible and elastic Z-zigzag shell (such as Figure 3 as shown, shaped like a bellows), such as Figure 3 As shown, it includes a shell, a spring and a pressure sensor. The spring is arranged in the shell, and the pressure sensor is arranged in one end of the shell and fixedly connected to the spring. The shell can be bent within a certain range and has certain elasticity and flexibility. It has a set of batteries built in to power the pressure sensor. The pressure sensor can transmit the sensed pressure electrical signal data to the computer host of the blender after power-on.

[0067] In this embodiment, the water supply system of the present invention is as follows Figure 4 As shown, water flows in through the flow meter, flows through the main shaft, the water supply hole opened inside the main shaft, the sensor bottom plate, and finally flows out from the nozzle.

[0068] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixing device having a concrete resistance sensor assembly, comprising a mounting seat (13), characterized in that: A fixed shaft (9) is fixedly mounted on the top of the mounting seat (13). The fixed shaft (9) is of hollow design. A main shaft (6) is arranged inside the fixed shaft (9). A D-shaped shaft (18) is fixedly mounted on one end of the main shaft (6). The D-shaped shaft (18) passes through the mounting seat (13). The top of the fixed shaft (9) is dynamically sealed and connected to a cylindrical mounting seat (16). The other end of the main shaft (6) passes through both the fixed shaft (9) and the cylindrical mounting seat (16). A bolt (4) is threadedly connected to the outside of the main shaft (6) and located above the cylindrical mounting seat (16). A first water passage is provided on the top of the main shaft (6). The cylindrical A sensor housing (3) is fixedly mounted on both sides of the cylindrical mounting seat (16); a sensor housing bottom plate (2) is fixedly mounted on the bottom of the sensor housing (3); a second water passage is provided between the two sensor housings (3) and the cylindrical mounting seat (16); the first water passage is communicated with the second water passage; a rotating shaft (1) is provided inside the sensor housing (3); a water outlet (14) is provided at the bottom of the sensor housing (3) and at both ends of the second water passage; a nozzle (8) is fixedly mounted inside the water outlet (14); a flow meter (5) is inserted into the first water passage; the flow meter (5) 5) is fixedly mounted with an electromagnetic valve (15), a plurality of bolt holes (12) are provided at the bottom of the sensor housing (3), the inner threads of the bolt holes (12) are connected with blades (7), two inner grooves (23) are provided inside the sensor housing (3), two outer convex keys (22) are fixedly mounted on the outer side of the rotating shaft (1), first limiting slots (17) are provided on the sensor housing (3) at positions respectively communicating with the two inner grooves (23), second limiting slots (24) are provided on the outer convex keys (22) at positions respectively communicating with the two inner grooves (23), and the second limiting slots (24) are provided A sensor assembly (11) is arranged inside the housing, the sensor assembly (111) comprising a housing (111), a spring (112) and a pressure sensor (113), one end of the pressure sensor (113) is tightly fitted with the first limiting slot (17), a spring (112) is fixedly mounted on one side of the pressure sensor (113), the housing (111) is located outside the spring (112) and the pressure sensor (113), one end of the housing (111) is inserted into the inside of the second limiting slot (24), and a bearing (10) is symmetrically arranged on the inner wall of the sensor housing (3) and at a position that fits the rotating shaft (1).

2. The mixing device with a concrete resistance sensor assembly according to claim 1, characterized in that: The rotating shaft (1) is connected to the sensor housing (3) via a spline.

3. The mixing equipment with concrete resistance sensor assembly according to claim 1, characterized in that: The mounting seat (13) is symmetrically provided with threaded holes (20).

4. The mixing equipment with concrete resistance sensor assembly according to claim 1, characterized in that: The inner surface of the bearing bush (10) contacting the rotating shaft (1) is provided with a bearing alloy (21) to reduce friction.

5. The mixing equipment with concrete resistance sensor assembly according to claim 1, characterized in that: The sensor housing (3) uses a Z-shaped variable housing.

6. The mixing equipment with concrete resistance sensor assembly according to claim 1, characterized in that: The bearing bush (10) and the sensor housing (3) are bonded together using glue.

7. The mixing equipment with a concrete resistance sensor assembly according to claim 1, characterized in that: The stiffness of the spring (112) is 10N / mm-50N / mm.

8. The mixing equipment with a concrete resistance sensor assembly according to claim 1, characterized in that: The blades (7) are arranged vertically as a whole.

9. The mixing equipment with concrete resistance sensor assembly according to claim 4, characterized in that: A plurality of oil storage grooves (19) are provided on the bearing alloy (21) on a side close to the rotating shaft (1).

10. The mixing equipment with concrete resistance sensor assembly according to claim 1, characterized in that: After the rotating shaft (1) is subjected to concrete resistance, its rotation angle is limited to 0°-45°; the housing (111) is a hollow corrugated tube and is in an arc shape, and is generally in an arc shape; the surface roughness of the connecting portion of the rotating shaft (1) and the sensor housing (3) is 3.2 μm-6.3 μm; the cross section of the bearing (10) is also in an arc shape, and its radial thickness is 2 mm-5 mm; the pressure sensor (113) has a built-in wireless signal transmission function, that is, it has a micro wireless transmission communication module inside, and transmits the sensed pressure digital signal to the mixer host through a wireless signal.

Images