Dynamic balance testing device for blades of concrete mixer

Abstract

The invention relates to the technical field of mechanical blade part vibration balance testing, in particular to a concrete mixer blade dynamic balance testing device which comprises a fixedly-arranged outer cylinder, an inner cylinder is coaxially fixed in the outer cylinder, a split type plugging cover is installed on the top of the outer cylinder, and a plurality of blades are arranged on the outer cylinder. A central through hole is formed in the center of the top of the plugging cover, the lower end of a to-be-tested stirring blade extends into a stirring cavity of the inner cylinder, a plurality of multi-working-condition simulation units are uniformly arranged on the side wall of the stirring cavity along the circumference at intervals, an impeller piece is arranged at the bottom of the stirring cavity, and the impeller piece is connected with the stirring cavity. And a balance test component is arranged in the plugging cover. According to the invention, different operation conditions and operation resistance states can be simulated in the operation state of the stirring blade, the dynamic balance vibration state of the stirring vertical shaft is monitored in real time, recorded and uploaded, the test close to the actual working state is realized, the accuracy and reliability of the test result are greatly improved, and the actual performance of the stirring blade is reflected more truly.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration balance testing of mechanical blade components, and in particular to a dynamic balance testing device for the blades of a concrete mixing machine. Background Art

[0002] When a concrete mixing machine is mixing concrete slurry, the blades rotate at a high speed. If the blades are dynamically unbalanced, a periodic centrifugal force will be generated, which will cause the vibration of the equipment to intensify due to the vibration of the mixing shaft. This vibration will not only affect the mixing effect, but also cause the components of the equipment to bear additional dynamic loads. Long-term operation will cause the connection components of the equipment to loosen, the bearings to wear more severely, and even cause fatigue cracks in the structural components of the equipment, shortening the service life of the equipment. In severe cases, it may even cause equipment failures and affect the normal progress of production.

[0003] By conducting a balance test on the mixing vertical shaft of the mixing blades, the imbalance problem of the blades can be detected and corrected in a timely manner, effectively reducing the vibration of the equipment and ensuring the stable and reliable operation of the equipment. Therefore, it is generally necessary to conduct a balance test on the blade assembly of a concrete mixing machine before leaving the factory or after replacing new blades.

[0004] For example, in a patent document with a patent application number of CN202010365568.9 and an IPC classification number of G01M1 / 12, a mixing blade balance detection device is disclosed. It mainly consists of two parallel vertical frames, which are fixed by a connecting rod between the vertical frames; there is an arc groove A at the top of the vertical frame, a movable slider is arranged at the bottom of the groove, and there is an elastic layer on the inner wall of the arc groove B at the top of the slider for fixing the mixing blade. Some vertical frames are provided with pointers, the slider is provided with an indicating notch, and there are support legs at the bottom of the vertical frame, and the support legs are also connected by a connecting rod.

[0005] The above device judges whether the mixing blades are balanced based on the principles of gravity and slider movement. The following disadvantages exist in the actual balance test: The mixing blade balance detection device is mainly for static testing, and there are obvious deficiencies in the dynamic balance testing of the moving state. However, in actual motion, the mixing blades will be affected by complex dynamic forces, such as the resistance of the medium, inertial forces, etc., and different mixing speeds and medium characteristics will also affect the force on the blades. The above device does not have the simulation of dynamic working conditions.

[0006] In addition to judging whether the blades are balanced, dynamic balance testing also needs to obtain some key dynamic parameters, such as vibration amplitude, vibration frequency, etc. These parameters are crucial for evaluating the stability and reliability of the blades in the moving state. However, this patent only judges whether the center of gravity position of the blades meets the requirements through the pointer and the indicating notch, and cannot measure and provide these dynamic parameters, and cannot comprehensively reflect the balance performance of the blades in the moving state.

[0007] Based on this, it can be seen that there is a necessity to design a device that can realize the dynamic balance test of the blade assembly for concrete mixing machines based on dynamic simulation. Summary of the Invention

[0008] One of the technical solutions adopted by the present invention to solve the above technical problems is: a dynamic balance test device for the blades of a concrete mixing machine, including a fixed outer cylinder, an inner cylinder coaxially fixed inside the outer cylinder, a split sealing cover installed on the top of the outer cylinder, a central through hole provided at the center of the top of the sealing cover, the lower end of the mixing blade to be tested extends into the mixing chamber of the inner cylinder, several multi-condition simulation units are evenly spaced along the circumference of the side wall of the mixing chamber, a wave wheel member is arranged at the bottom of the mixing chamber, an appropriate amount of fluid slurry is pre-supplied inside the mixing chamber, and a balance test component is installed inside the sealing cover.

[0009] In any of the above solutions, preferably, the multi-condition simulation unit includes several radial rubber baffles spaced at intervals from top to bottom along the height direction of the inner cylinder. The inner ends of each radial rubber baffle are respectively movably and hermetically passed through the square through holes provided on the outer side wall of the inner cylinder and extend into the mixing chamber. A density sensor is installed at the inner end of the radial rubber baffle, and the density sensor is used to measure the density and viscosity of the current slurry in real time. The outer end of the radial rubber baffle extends into the annular cavity formed by the outer cylinder and the inner cylinder. An arc-shaped tail seat is fixedly formed at the outer end of the outer cylinder. A stepped shaft is movably clamped in the stepped circular groove on the outer side wall of the arc-shaped tail seat. The stepped shaft can rotate around a fixed axis in the stepped circular groove. An adjusting threaded rod is fixedly installed at the outer end of the stepped shaft. The outer end of the adjusting threaded rod passes through the corresponding threaded hole on the outer cylinder and extends to the outside thereof. An adjusting handwheel is installed at the outer end of the adjusting threaded rod.

[0010] In any of the above solutions, preferably, controlling the inner ends of each radial rubber baffle to extend into the mixing chamber by different lengths can enable each radial rubber baffle to form different trends in the mixing chamber, so as to collect the state changes of the vibration stability of the mixing blade under different resistance simulation states of the slurry.

[0011] In any of the above solutions, preferably, the central through hole is used for the mixing vertical shaft of the mixing blade to pass through and the two are in clearance fit. The blade at the lower end of the mixing blade extends into the mixing chamber. When the mixing blade is in a rotating state, it is used to stir the concrete slurry mixture inside the mixing chamber.

[0012] In any of the above schemes, it is preferred that a plurality of material pipes are installed at even intervals along the circumference of the bottom of the inner cylinder, the lower end of each material pipe is movably extended to the bottom of the outer cylinder and is respectively connected to an external pipeline with a pump, and a control valve is installed on each material pipe. Each material pipe is used to transport various components of the slurry into the stirring chamber or to transport the stirred slurry to the outside.

[0013] In any of the above schemes, it is preferred that the multi-condition simulation unit is used to monitor the thickness state and shaking amplitude of the stirring material inside the stirring chamber and upload the collected data information to an external control terminal; through the individual adjustment of each of the multi-condition simulation units, the resistance state of the slurry flow inside the stirring chamber can be changed to achieve the purpose of simulating different stirring conditions.

[0014] In any of the above schemes, it is preferred that each monitoring end of the multi-condition simulation unit located inside the stirring chamber can be independently adjusted along the radial direction of the stirring chamber.

[0015] In any of the above schemes, preferably, the balance test component is used to monitor the dynamic balance vibration state of the stirring shaft of the stirring blade in the circumferential direction.

[0016] In any of the above schemes, preferably, the balance test component includes a constraint sleeve fixedly mounted on the bottom of the sealing cover outside the central through hole, the constraint sleeve is coaxially arranged with the central through hole, and vibration sensors are installed in each mounting groove evenly arranged along the circumference of the inner cavity side wall of the constraint sleeve, each of the vibration sensors is used to monitor the vibration amplitude and vibration frequency of the stirring shaft in the opposite direction thereof, each of the vibration sensors uploads the collected vibration signal to an external control terminal in real time, and when the vibration information collected by the vibration sensor is greater than a set threshold, the vibration sensor links the external control terminal to send a warning signal.

[0017] In any of the above schemes, it is preferred that the upper end of the stirring vertical shaft of the stirring blade is located above the blocking cover and is fixedly connected to the power part of the external stirring equipment as required.

[0018] In any of the above schemes, preferably, a ground connection seat is fixedly installed below the outer cylinder, and the ground connection seat is fixedly connected to the outer cylinder via a column.

[0019] In any of the above schemes, it is preferred that the impeller component includes a rotating impeller installed at the bottom of the stirring chamber, the bottom of the central axis of the rotating impeller is movable and sealed to pass through the inner cylinder and extend to the bottom of the outer cylinder, and a rotating motor is fixed at the bottom center of the outer cylinder, and the motor shaft of the rotating motor is fixedly connected to the central axis of the rotating impeller.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention can simulate different operating conditions and operating resistance states when the stirring blades are in operation, real-time monitor the dynamic balance vibration state of the stirring vertical shaft, record and upload it, realize the test close to the actual working state, greatly improve the accuracy and reliability of the test results, and more truly reflect the actual performance of the stirring blades. By rotating the wave wheel in the same or opposite direction as the stirring blades, different working conditions such as good fluidity of materials and stirring of highly viscous materials are simulated.

[0021] 2. The present invention adopts an overall modular design. During the R & D stage of concrete mixing equipment, it is convenient to quickly replace stirring blades of different models for testing, effectively improving the R & D efficiency and reducing the R & D cost, while conventional testing devices are difficult to quickly adapt to stirring blades of multiple models. When developing new stirring blades, it is possible to conveniently replace stirring blades of different designs for testing.

[0022] 3. The multi-condition simulation unit and the balance test component of the present invention cooperate to work, with multi-condition simulation and real-time monitoring and recording functions, providing comprehensive data support for evaluating the dynamic balance performance of the stirring blades. In the quality monitoring link of concrete mixing equipment, it can monitor the performance of the stirring blades under multiple working conditions at one time, save a large amount of monitoring time, improve the monitoring efficiency, and can also discover potential problems that are difficult to detect by traditional single-condition testing.

[0023] 4. The clearance fit between the central through hole of the present invention and the stirring vertical shaft not only ensures the flexible rotation of the stirring vertical shaft, but also limits its swaying range, which helps to improve the test accuracy; the material pipes evenly spaced at the bottom of the inner cylinder, in cooperation with the control valve, can not only evenly transport the slurry ingredients, but also adjust the state of the slurry in the mixing chamber according to the test requirements, realizing the dynamic management of the slurry, and can accurately proportion the ingredients in the research and development of special concrete formulas.

[0024] 5. The multi-condition simulation unit of the present invention has multiple functions. Its inner end can be independently adjusted along the radial direction of the mixing chamber, and it can more accurately obtain the information of the slurry state at different positions in the mixing chamber, improving the accuracy of the simulated working conditions; the radial rubber baffle in the multi-condition simulation unit is adjustable, and in combination with the density sensor to real-time monitor the slurry state, it can finely adjust the flow resistance of the slurry and accurately simulate different mixing working conditions, providing an effective adjustment means for studying the relationship between the slurry and the performance of the stirring blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to actual scale.

[0026] Figure 1It is a three-dimensional structural schematic diagram before the stirring blades are installed on the dynamic balance test device of the concrete mixing machine.

[0027] Figure 2 It is Figure 1 the front view structural schematic diagram.

[0028] Figure 3 It is Figure 1 the top view structural schematic diagram.

[0029] Figure 4 It is the internal sectional structural schematic diagram after the stirring blades are installed on the dynamic balance test device of the concrete mixing machine.

[0030] Figure 5 It is Figure 1 the internal sectional structural schematic diagram.

[0031] Figure 6 It is Figure 5 the three-dimensional sectional structural schematic diagram.

[0032] Figure 7 It is the first partial three-dimensional structural schematic diagram of the present invention.

[0033] Figure 8 It is the second partial three-dimensional structural schematic diagram of the present invention.

[0034] Figure 9 It is Figure 8 the top view structural schematic diagram.

[0035] Figure 10 It is the three-dimensional structural schematic diagram of the first perspective of the inner cylinder body of the present invention.

[0036] Figure 11 It is the three-dimensional structural schematic diagram of the second perspective of the inner cylinder body of the present invention.

[0037] Figure 12 It is the internal sectional structural schematic diagram of the outer cylinder body of the present invention.

[0038] Figure 13 It is the structural schematic diagram of the wave wheel part of the present invention.

[0039] Figure 14 It is the partial internal sectional structural schematic diagram in the mating state of the radial rubber baffle and the adjusting threaded rod.

[0040] Figure 15 It is the three-dimensional structural schematic diagram in the mating state of the radial rubber baffle and the adjusting threaded rod of the present invention.

[0041] In the figure, 1. outer cylinder; 2. inner cylinder; 3. plugging cover; 4. central through hole; 5. stirring blade; 6. stirring chamber; 7. stirring vertical shaft; 8. material pipe; 9. control valve; 10. rotating motor; 11. rotating wave wheel; 12. restraint sleeve; 13. vibration sensor; 14. ground connection base; 15. column; 16. radial rubber baffle; 17. density sensor; 18. arc-shaped tail seat; 19. stepped shaft; 20. stepped circular groove; 21. adjusting threaded rod; 22. adjusting handwheel; 23. annular cavity; 24. square through port. Specific embodiments

[0042] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention. The specific structure of the present invention is as Figures 1 - 15 shown in the figure.

[0043] Embodiment 1: A dynamic balance test device for the blades of a concrete mixing machine, including a fixed outer cylinder 1, an inner cylinder 2 coaxially fixed inside the outer cylinder 1, a split plugging cover 3 installed on the top of the outer cylinder 1, a central through hole 4 provided at the center of the top of the plugging cover 3, the lower end of the stirring blade 5 to be tested extends into the stirring chamber 6 of the inner cylinder 2, a plurality of multi-condition simulation units are evenly spaced along the circumference of the side wall of the stirring chamber 6, a wave wheel member is provided at the bottom of the stirring chamber 6, an appropriate amount of fluid slurry is pre-supplied inside the stirring chamber 6, and a balance test component is installed inside the plugging cover 3.

[0044] The dynamic balance test device for the blades of a concrete mixing machine can be used to perform dynamic balance tests on the stirring blade 5 in the installed state, and simulate different operating conditions and operating resistance states when the stirring blade 5 is in operation, so as to monitor the dynamic balance vibration state of the stirring vertical shaft 7 of the current stirring blade 5 in real time under multi-condition states and record and upload it in real time.

[0045] Before the specific work, the lower end of the stirring blade 5 to be tested passes through the central through hole 4 at the center of the top of the split plugging cover 3, so that the blade at the lower end of the stirring blade 5 extends into the stirring chamber 6 of the inner cylinder 2. The stirring vertical shaft 7 is in clearance fit with the central through hole 4 to ensure that the stirring blade 5 can rotate freely. The upper end of the stirring vertical shaft 7 of the stirring blade 5 is above the plugging cover 3 and is fixedly connected to the power component of the external stirring equipment as required to maintain the positioning stability of the stirring vertical shaft 7 and provide power for the subsequent rotation of the stirring blade 5.

[0046] The material pipes 8 evenly spaced along the circumference at the bottom of the inner cylinder 2 have their lower ends movably passing through the lower part of the outer cylinder 1 and are respectively connected to the pipes with pumps outside. Control valves 9 are installed on each material pipe 8. By controlling the opening and closing of the material pipes 8 through the control valves 9, and using the power of the external pumps, the respective component materials of the slurry are transported into the stirring chamber 6, so that an appropriate amount of fluid slurry is pre-supplied inside the stirring chamber 6 to simulate the material environment during actual stirring operations.

[0047] The rotating motor 10 fixed at the center of the bottom of the outer cylinder 1 is started. The motor shaft of the rotating motor 10 drives the central shaft of the rotating wave wheel 11 to rotate, and then the rotating wave wheel 11 installed at the bottom of the stirring chamber 6 rotates. The rotating wave wheel 11 stirs the slurry in the stirring chamber 6, increasing the flow complexity of the slurry, more realistically simulating the actual stirring conditions, and providing a more practical environment for the dynamic balance test.

[0048] The rotation direction of the rotating wave wheel 11 can be controlled as required and can be the same as or opposite to that of the stirring blades 5.

[0049] When they are in the same direction, it simulates the condition where the stirring equipment is stirring normally and the material has good fluidity, and the cooperation between the stirring blades 5 and the material is relatively smooth. Under this simulated condition, when the rotating wave wheel 11 and the stirring blades 5 rotate in the same direction, it will increase the same-direction flow speed of the material, enhance the axial flow effect of stirring, and make the material form a relatively regular circulating flow in the stirring chamber 6. In this way, the dynamic balance performance of the stirring blades 5 under this smooth stirring state is tested, the vibration condition of the stirring vertical shaft 7 is observed, the stability of the stirring blades 5 when the material flows rapidly in the same direction is evaluated, and it can also monitor whether the stirring blades 5 will generate abnormal vibrations due to dynamic balance problems in the scenario where the material cooperation is good.

[0050] When they are in the opposite direction, it simulates the condition where the stirring equipment stirs high-viscosity materials or encounters a sudden change in stirring resistance.

[0051] When the rotating wave wheel 11 and the stirring blades 5 rotate in the opposite direction, they apply opposite-direction forces to the material, which will generate strong shear forces inside the material, increase the degree of disorder of the material flow, and simulate the situation where the material is highly viscous and difficult to stir during the stirring process, or the extreme condition of a sudden change in resistance during the stirring process.

[0052] In addition, the overall modular design of this device can facilitate the quick replacement of stirring blades 5 of different models for testing during the research and development stage of concrete mixing equipment, greatly improving the research and development efficiency and reducing the research and development costs, while conventional testing devices often have difficulty quickly adapting to multiple models of blades.

[0053] Through this simulation, the dynamic balance performance of the stirring blade 5 under complex stress and disordered material flow conditions is tested, and the vibration amplitude and frequency changes of the vertical stirring shaft 7 are monitored, so as to judge the reliability and stability of the stirring blade 5 under difficult working conditions that may be actually encountered, and provide data support for optimizing the design of the stirring blade 5 and improving the ability of the stirring equipment to cope with complex working conditions.

[0054] The multi-condition simulation unit changes the flow resistance of the slurry inside the stirring chamber 6 to simulate different operating conditions; the balance test component monitors the dynamic balance vibration state of the vertical stirring shaft 7; when the stirring blade 5 is running, the whole device synchronously conducts simulation and monitoring, and records and uploads the data in real time. It realizes the test of the stirring blade 5 under near actual working conditions, improves the accuracy and reliability of the test results, and can more truly reflect the performance of the stirring blade 5 in actual use; it has the functions of multi-condition simulation and real-time monitoring and recording, and provides comprehensive data support for evaluating the dynamic balance performance of the stirring blade 5.

[0055] In the quality monitoring link of concrete mixing equipment, compared with the traditional single-condition test, this device can monitor the performance of the stirring blade 5 under multiple conditions at one time, save a large amount of monitoring time, improve the monitoring efficiency, and can discover potential problems that are difficult to detect by traditional monitoring methods.

[0056] In any of the above solutions, preferably, the central through hole 4 is used for the vertical stirring shaft 7 of the stirring blade 5 to pass through and the two are in clearance fit. The blade at the lower end of the stirring blade 5 extends into the stirring chamber 6. When the stirring blade 5 is in a rotating state, it is used to stir the concrete slurry mixture inside the stirring chamber 6.

[0057] The clearance fit here not only ensures that the vertical stirring shaft 7 can rotate flexibly, but also limits its shaking range to a certain extent, which helps to improve the accuracy of the test; the matching design of the stirring blade 5 and the stirring chamber 6 makes full use of the space of the stirring chamber 6 to achieve efficient slurry stirring. Ensure that the stirring blade 5 can work properly, stir the slurry to simulate the actual mixing operation, and provide a real working environment for the dynamic balance test. In addition, on some small concrete mixing equipment production lines, this device can also be used as an on-line monitoring device to monitor the concrete mixing state under multi-condition states and improve production efficiency, which is difficult to achieve by conventional monitoring methods.

[0058] In any of the above solutions, preferably, a plurality of material pipes 8 are uniformly installed at intervals along the circumference of the bottom of the inner cylinder 2. The lower ends of the material pipes 8 all pass out of the lower part of the outer cylinder 1 movably and are respectively connected to the pipes with pumps outside. Control valves 9 are installed on each of the material pipes 8. Each of the material pipes 8 is used to convey the respective components of the slurry into the stirring chamber 6 or convey the stirred slurry outwards.

[0059] The opening and closing of the material pipe 8 is controlled by the control valve 9. Using the power of an external pump, the slurry batching is conveyed into the mixing chamber 6 or the mixed slurry is discharged. The evenly spaced design of the material pipes 8 ensures that the slurry batching can enter the mixing chamber 6 evenly, improving the uniformity of slurry mixing; the controllable feeding and discharging methods facilitate adjusting the slurry state in the mixing chamber 6 according to test requirements. The dynamic management of the slurry in the mixing chamber 6 is realized, meeting the requirements for slurry in different test stages, such as supplementing new batching and discharging the mixed slurry. When developing some special concrete formulations, precise control of the proportion of slurry batching added each time is required. The material pipe 8 system of this device can also achieve precise batching by precisely controlling the opening and closing time of the valve and the flow rate of the pump, which is difficult to achieve in traditional test devices.

[0060] In any of the above - mentioned solutions, preferably, the multi - condition simulation unit is used to monitor the thick - thin state and shaking amplitude of the stirring material inside the mixing chamber 6 and upload the collected data information to an external control terminal; by individually adjusting each of the multi - condition simulation units, the resistance state when the slurry flows inside the mixing chamber 6 can be changed, so as to achieve the purpose of simulating different stirring conditions.

[0061] The multi - condition simulation unit obtains data by monitoring the stirring state, and then individually adjusts according to the control instruction to change the slurry flow resistance and realize the simulation of different stirring conditions.

[0062] The real - time monitoring and adjustment function makes the test simulation more accurate and flexible, and can adapt to the test requirements of a variety of different stirring conditions; the data uploading function facilitates the operator to master the internal situation of the mixing chamber 6 in real time and is convenient for timely adjusting the test parameters; the simulation of stirring conditions and the monitoring of the stirring state are realized, providing diverse test conditions and data support for the dynamic balance test. By simulating the internal situation of the mixing chamber 6 under different fault conditions and combining the dynamic balance test data, the cause of equipment failure can be more accurately judged and summarized.

[0063] In any of the above - mentioned solutions, preferably, each monitoring end of the multi - condition simulation unit located inside the mixing chamber 6 can be independently adjusted along the radial direction of the mixing chamber 6.

[0064] The independent adjustment function increases the flexibility and comprehensiveness of detection, can more accurately obtain the slurry state information at different positions inside the mixing chamber 6, and improves the accuracy of simulated conditions; further enhances the monitoring ability of the multi - condition simulation unit for the internal situation of the mixing chamber 6 and provides support for more accurately simulating different stirring conditions.

[0065] When studying the flow field distribution of the new stirring blade 5, the detection end of the multi - condition simulation unit of this device can flexibly adjust its position to obtain the flow field data at different positions, which helps to optimize the design of the stirring blade 5, while the traditional test device cannot realize the adjustment of the detection position.

[0066] In any of the above solutions, it is preferred that the balance test component is used to monitor the dynamic balance vibration state of the stirring vertical shaft 7 of the stirring blade 5 in the circumferential direction.

[0067] Focusing on monitoring the dynamic balance vibration of the stirring shaft 7 in the circumferential direction, it can accurately obtain key data and provide a direct basis for judging the dynamic balance performance of the stirring blade 5; and then realizing the monitoring of the dynamic balance vibration state of the stirring shaft 7, which is one of the core functions of the dynamic balance test and provides key data for evaluating the performance of the stirring blade 5.

[0068] During the maintenance of the concrete mixing equipment, the device can be used to regularly perform dynamic balancing detection on the mixing shaft 7 of the mixing blade 5, so as to discover potential vibration problems in advance, avoid component damage caused by dynamic balancing problems, and reduce maintenance costs and downtime.

[0069] In any of the above schemes, it is preferred that the balance test component includes a constraint sleeve 12 fixedly mounted on the bottom of the sealing cover 3 outside the central through hole 4, the constraint sleeve 12 is coaxially arranged with the central through hole 4, and vibration sensors 13 are installed in each mounting groove evenly arranged along the circumference of the inner cavity side wall of the constraint sleeve 12, each of the vibration sensors 13 is used to monitor the vibration amplitude and vibration frequency of the stirring shaft 7 in the opposite direction thereof, each of the vibration sensors 13 uploads the collected vibration signal to an external control terminal in real time, and when the vibration information collected by the vibration sensor 13 is greater than a set threshold, the vibration sensor 13 links the external control terminal to send a warning signal.

[0070] The vibration sensor 13 is installed in the installation groove of the constraint sleeve 12, and monitors the vibration amplitude and frequency of the corresponding direction of the stirring shaft 7 in real time, and uploads the signal; when the vibration information exceeds the set threshold, the control terminal issues an early warning. Among them, the constraint sleeve 12 and the central through hole 4 are coaxially arranged to ensure that the vibration sensor 13 can accurately monitor the vibration of the stirring shaft 7; multiple vibration sensors 13 are evenly distributed along the circumference, and can monitor the vibration of the stirring shaft 7 in all directions; the early warning function can promptly remind the operator of possible dynamic balance problems of the equipment. Overall, all-round monitoring and early warning of the vibration of the stirring shaft 7 are achieved, providing important support for ensuring the normal operation of the stirring blade 5 and the safety of the equipment.

[0071] In any of the above solutions, it is preferred that the upper end of the stirring vertical shaft 7 of the stirring blade 5 is located above the blocking cover 3 and is fixedly connected to the power part of the external stirring equipment as required.

[0072] The way of fixed connection on demand enables the device to adapt to power components of different types of stirring equipment, improving the versatility and flexibility of the device; it provides rotational power for the stirring blade 5 to ensure the normal operation of the stirring blade 5 during the test, and is also a necessary condition for realizing the dynamic balance test of the stirring blade 5.

[0073] Preferably, in any of the above solutions, a ground connection base 14 is fixedly installed below the outer cylinder 1, and the ground connection base 14 is fixedly connected to the outer cylinder 1 through a column 15.

[0074] The structural design of the ground connection base 14 and the column 15 enhances the stability of the device, ensuring that the device will not be displaced or shaken due to vibration or other reasons during the operation of the stirring blade 5, and guaranteeing the accuracy of the test results.

[0075] Preferably, in any of the above solutions, the wave wheel member includes a rotating wave wheel 11 installed at the bottom of the stirring chamber 6. The bottom of the central axis of the rotating wave wheel 11 movably and sealingly passes through the inner cylinder 2 and extends below the outer cylinder 1. A rotating motor 10 is fixed at the center of the bottom of the outer cylinder 1, and the motor shaft of the rotating motor 10 is fixedly connected to the central axis of the rotating wave wheel 11.

[0076] After the rotating motor 10 is started, it drives the central axis of the rotating wave wheel 11 to rotate, and then makes the rotating wave wheel 11 rotate at the bottom of the stirring chamber 6, stirring the slurry in the stirring chamber 6 and changing the flow state of the slurry. The combined design of the rotating wave wheel 11 and the rotating motor 10 is simple and efficient, can effectively stir the slurry, enhance the authenticity of simulating the stirring working condition; the sealing design prevents the slurry from leaking and ensures the normal operation of the device. It assists the stirring blade 5 to stir the slurry, increases the flow complexity of the slurry, more realistically simulates the actual stirring working condition, and provides a more practical environment for the dynamic balance test.

[0077] Embodiment 2: Compared with Embodiment 1, the difference of this embodiment is that it further includes the following technical features: Preferably, in any of the above solutions, the multi-condition simulation unit includes a plurality of radial rubber baffles 16 arranged at intervals from top to bottom along the height direction of the inner cylinder 2. The inner ends of the radial rubber baffles 16 respectively pass through the square through-holes 24 provided on the outer side wall of the inner cylinder 2 movably and sealingly and extend into the stirring chamber 6. A density sensor 17 is installed at the inner end of the radial rubber baffle 16, and the density sensor 17 is used to measure the density and viscosity of the current slurry in real time. The outer end of the radial rubber baffle 16 extends into the annular cavity 23 formed by the outer cylinder 1 and the inner cylinder 2. An arc-shaped tailstock 18 is fixedly formed at the outer end of the outer cylinder 1. A stepped shaft 19 is movably clamped in a stepped circular groove 20 on the outer side wall of the arc-shaped tailstock 18. The stepped shaft 19 can rotate around a fixed axis in the stepped circular groove 20. An adjusting threaded rod 21 is fixedly installed at the outer end of the stepped shaft 19. The outer end of the adjusting threaded rod 21 passes through a corresponding threaded hole on the outer cylinder 1 and extends to the outside thereof. An adjusting handwheel 22 is installed at the outer end of the adjusting threaded rod 21.

[0078] By rotating the adjusting handwheel 22, the adjusting threaded rod 21 is driven to rotate, so that the stepped shaft 19 rotates in the stepped circular groove 20 of the arc-shaped tailstock 18, and then the radial rubber baffle 16 is driven to move, changing the length of its extension into the stirring chamber 6; the density sensor 17 at the inner end measures the density and viscosity of the slurry in real time and uploads the data.

[0079] This adjustable radial rubber baffle 16 can more flexibly change the flow resistance of the slurry in the stirring chamber 6 and simulate working conditions; the density sensor 17 monitors the slurry state in real time to provide more accurate data support for simulation and testing; the sealing design prevents slurry leakage and ensures the normal operation of the device, thereby further enriching the functions of the multi-condition simulation unit, realizing the fine adjustment of the slurry flow resistance and the real-time monitoring of the slurry state, and improving the accuracy and comprehensiveness of simulating different stirring working conditions.

[0080] Preferably, in any of the above solutions, controlling the inner ends of the radial rubber baffles 16 to extend into the stirring chamber 6 by different lengths can enable the radial rubber baffles 16 to form different trends in the stirring chamber 6, so as to collect the state changes of the vibration stability of the stirring blades 5 under different resistance simulation states of the slurry.

[0081] By operating the adjusting handwheel 22 to rotate the adjusting threaded rod 21, the stepped shaft 19 is driven to rotate, thereby changing the length of the radial rubber baffle 16 extending into the stirring chamber 6, making each baffle present different trends in the stirring chamber 6, changing the slurry flow path and resistance, and then observing the influence on the vibration stability of the stirring blades 5 and collecting relevant data.

[0082] This adjustable structural design can create a diverse slurry flow resistance environment, accurately simulate the resistance conditions experienced by the stirring blade 5 under different stirring conditions, and greatly improve the comprehensiveness and accuracy of the test. Moreover, complex working condition simulation is achieved through a simple manual adjustment method, which is easy to operate and has a low cost. It provides an effective means for studying the relationship between the resistance state of the slurry and the vibration stability of the stirring blade 5. The data collected can be used to evaluate the performance of the stirring blade 5 under different working conditions, providing a basis for optimizing the design of the stirring blade 5 and improving the stirring process.

[0083] Precisely simulate various complex slurry flow resistance scenarios. By changing the trend of the radial rubber baffle 16, simulate the influence of different shaped obstacles on the slurry flow and the vibration of the stirring blade 5. This is a refined simulation function that is difficult to achieve with conventional stirring equipment.

[0084] The process of testing the stirring vertical shaft 7 of the stirring blade 5 under multiple working conditions by this device is as follows: Device preparation: Pass the lower end of the stirring blade 5 to be tested through the central through hole 4 at the center of the top of the split plugging cover 3 (the plugging cover 3 can be disassembled in advance and assembled again after the lower end of the stirring blade 5 passes through), so that the blade at the lower end of the stirring blade 5 extends into the stirring chamber 6 of the inner cylinder 2. The stirring vertical shaft 7 has a clearance fit with the central through hole 4, and the upper end of the stirring vertical shaft 7 of the stirring blade 5 is above the plugging cover 3 and is fixedly connected to the power component of the external stirring equipment as required.

[0085] The material pipes 8 evenly spaced along the circumference at the bottom of the inner cylinder 2 have their lower ends movably passing through the lower part of the outer cylinder 1 and are respectively connected to the pipes with pumps outside, and control valves 9 are installed on each material pipe 8. Using the power of the external pump, control the opening and closing of the material pipes 8 through the control valves 9 to convey the component ingredients of the slurry into the stirring chamber 6, so as to pre-supply an appropriate amount of fluid slurry inside the stirring chamber 6. The bottom center of the outer cylinder 1 is fixedly connected to the grounding seat 14, and the grounding seat 14 is fixedly connected to the outer cylinder 1 through the column 15 to ensure the stability of the device.

[0086] The settings of multiple simulation working conditions are as follows: Simulation of the working condition with better material fluidity: Start the rotary motor 10 at the center of the bottom of the outer cylinder 1. The motor shaft of the rotary motor 10 drives the central shaft of the rotary wave wheel 11 to rotate, so that the rotary wave wheel 11 rotates, and the rotary wave wheel 11 rotates in the same direction as the stirring blade 5. At this time, increase the co-directional flow velocity of the material to enhance the axial flow effect of the stirring, and make the material form a relatively regular circulating flow in the stirring chamber 6, simulating the working condition of the stirring equipment during normal stirring with better material fluidity and a relatively smooth cooperation between the stirring blade 5 and the material.

[0087] Simulation of high-viscosity materials or working conditions with sudden resistance changes: Change the rotation direction of the rotary wave wheel 11 so that it rotates in the opposite direction to the stirring blade 5. The two apply forces in opposite directions to the material, generating strong shear forces inside the material, increasing the degree of material flow disorder, and simulating the working conditions of the stirring equipment for stirring high-viscosity materials or encountering sudden changes in stirring resistance.

[0088] Simulation of changing the flow resistance of the slurry: The multi-condition simulation unit comes into play. If the multi-condition simulation unit includes the radial rubber baffle 16, by rotating the adjustment handwheel 22, the adjustment threaded rod 21 is driven to rotate, causing the stepped shaft 19 to rotate in the stepped circular groove 20 of the arc-shaped tailstock 18, and then driving the radial rubber baffle 16 to move, changing the length of its extension into the stirring chamber 6, controlling the inner ends of the radial rubber baffles 16 to extend into the stirring chamber 6 by different lengths, so that the radial rubber baffles 16 form different trends in the stirring chamber 6, changing the slurry flow path and resistance, and simulating different stirring conditions. The multi-condition simulation unit can also monitor the thickening state and shaking amplitude of the stirred material inside the stirring chamber 6, and upload the collected data information to the external control terminal, and adjust it separately according to the control instructions to further accurately simulate different stirring conditions.

[0089] Monitoring the dynamic balance of the stirring vertical shaft: The balance test component starts to work. The vibration sensors 13 in the balance test component are installed in the inner cavity side wall installation grooves of the restraint sleeve 12 fixed to the bottom of the plug cover 3 outside the central through hole 4. Each vibration sensor 13 monitors the vibration amplitude and vibration frequency of the stirring vertical shaft 7 in the direction directly opposite to it, and uploads the collected vibration signals to the external control terminal in real time. When the vibration information collected by the vibration sensor 13 is greater than the set threshold, the external control terminal is linked to send a warning signal, so as to realize the monitoring of the dynamic balance vibration state of the stirring vertical shaft 7 in the circumferential direction.

[0090] Data recording and analysis: During the whole test process, the device synchronously conducts simulation and monitoring, and the data of the stirred material state monitored by the multi-condition simulation unit, the vibration data of the stirring vertical shaft 7 monitored by the balance test component, etc. are all recorded and uploaded in real time.

[0091] According to these data, the operator analyzes the dynamic balance performance of the stirring blade 5 under different working conditions as needed, judges the reliability and stability of the stirring blade 5 under difficult working conditions that may be actually encountered, and provides data support for optimizing the design of the stirring blade 5 and improving the ability of the stirring equipment to cope with complex working conditions.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; for those skilled in the art of this technology, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0093] Where the present invention is not described in detail, it is the well-known technology of those skilled in the art of this technology.

Claims

1. Dynamic balance test device for the blades of a concrete mixing machine, characterized in that: It includes a fixedly arranged outer cylinder body, an inner cylinder body is coaxially and fixedly arranged inside the outer cylinder body, a split sealing cover is installed on the top of the outer cylinder body, a central through hole is provided at the center of the top of the sealing cover, the lower end of the stirring blade to be tested extends into the stirring cavity of the inner cylinder body, a plurality of multi-condition simulation units are evenly spaced along the circumference on the side wall of the stirring cavity, a wave wheel part is arranged at the bottom of the stirring cavity, an appropriate amount of fluid slurry is pre-supplied inside the stirring cavity, and a balance test component is installed inside the sealing cover.

2. The dynamic balance test device for the concrete mixing machine blade according to claim 1, wherein: The central through hole is used for the stirring vertical shaft of the stirring blade to pass through and the two are in clearance fit, the blades at the lower end of the stirring blade extend into the stirring cavity, and when the stirring blade is in a rotating state, it is used to stir the concrete slurry mixture inside the stirring cavity.

3. The dynamic balance test device for the concrete mixing machine blade according to claim 2, characterized in that: A plurality of material pipes are evenly spaced along the circumference at the bottom of the inner cylinder body, the lower ends of each material pipe movably penetrate to the lower part of the outer cylinder body and are respectively connected to the external pipes with pumps, control valves are installed on each material pipe, and each material pipe is used to convey the respective component materials of the slurry into the stirring cavity or convey the stirred slurry outwards.

4. The dynamic balance test device for the concrete mixing machine blade according to claim 3, characterized in that: The multi-condition simulation unit is used to monitor the thickening state and shaking amplitude of the material stirring inside the stirring cavity and upload the collected data information to the external control terminal; by individually adjusting each multi-condition simulation unit, the resistance state when the slurry flows inside the stirring cavity can be changed to achieve the purpose of simulating different stirring conditions.

5. The dynamic balance test device for the concrete mixing machine blade according to claim 4, wherein: Each monitoring end of the multi-condition simulation unit located inside the stirring cavity can be independently adjusted along the radial direction of the stirring cavity.

6. The dynamic balance test device for the concrete mixing machine blade according to claim 5, characterized in that: The balance test component is used to monitor the dynamic balance vibration state of the stirring vertical shaft of the stirring blade in the circumferential direction.

7. The dynamic balance test device for the concrete mixing machine blade according to claim 6, characterized in that: The balance test component includes a restraint sleeve fixedly installed at the bottom of the sealing cover outside the central through hole, the restraint sleeve is coaxially arranged with the central through hole, vibration sensors are installed in each installation groove evenly arranged along the circumference on the inner cavity side wall of the restraint sleeve, each vibration sensor is respectively used to monitor the vibration amplitude and vibration frequency of the stirring vertical shaft at the direction directly opposite to it, each vibration sensor uploads the collected vibration signal to the external control terminal in real time, and when the vibration information collected by the vibration sensor is greater than the set threshold value, the vibration sensor drives the external control terminal to send out a warning signal.

8. The dynamic balance testing device for the concrete mixing machine blade according to claim 7, characterized in that: The upper end of the stirring vertical shaft of the stirring blade is located above the sealing cover and is fixedly connected to the power component of the external stirring equipment as required.

9. The dynamic balance test device for the concrete mixing machine blade according to claim 8, wherein: A ground connecting seat is fixedly installed under the outer cylinder body, and the ground connecting seat is fixedly connected to the outer cylinder body through a column.

10. The dynamic balance test device for the blades of a concrete mixing machine according to claim 9, wherein: The wave wheel part includes a rotating wave wheel installed at the bottom of the stirring cavity, the bottom of the central shaft of the rotating wave wheel movably and sealingly penetrates the inner cylinder body and extends to the lower part of the outer cylinder body, a rotating motor is fixedly installed at the center of the bottom of the outer cylinder body, and the motor shaft of the rotating motor is fixedly connected to the central shaft of the rotating wave wheel.

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