A dynamic balance testing device for construction machinery

Abstract

The application relates to the technical field of mechanical fault detection, in particular to a dynamic balance detection device for construction engineering construction machinery, which comprises a base and a base frame, a first motor is fixed on the base, a main shaft is arranged at the output end of the first motor, and an impeller to be subjected to dynamic balance detection is cooperatively arranged on the main shaft; a blower is fixedly arranged on the base frame and used for generating simulated airflow, a wind guide pipe is fixed on the blower and arranged opposite to the blades of the impeller, the blower comprises a second motor fixed on the base frame, a fan rotating shaft is arranged at the output end of the second motor, a fan blade is fixed on the fan rotating shaft and rotatably arranged in the blower shell, and a flow guide plate rotating shaft is rotatably arranged on the wind guide pipe and penetrates through the wind guide pipe, the dynamic balance detection of the application can actively simulate the real working environment, can reproduce the dynamic airflow, wind direction change and dust environment and other comprehensive factors, so that the dynamic balance performance of the rotating part under the actual working condition can be more accurately evaluated when the rotating part is detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical fault detection, and particularly relates to a dynamic balance detection device for construction engineering construction machinery. BACKGROUND

[0002] In the field of construction engineering, the dynamic balance performance of core rotating parts such as impellers and fan rotors of tower cranes, tunnel fans and large water pumps directly relates to the safety, stability and service life of equipment operation. After manufacturing, installation or long-term operation, these parts may have uneven mass distribution, produce dynamic imbalance and cause severe vibration, which poses a huge safety hazard.

[0003] At present, dynamic balance detection of such rotating parts needs to disassemble the rotor from the whole machine and perform detection on a dedicated balancing machine. However, the existing detection devices have single functions and obvious limitations. The impellers of construction machinery do not run in static and clean air in actual work, but continuously bear complex and variable environmental loads. For example, a tunnel fan needs to overcome wind resistance and may encounter vortex, an open-air cooling fan is affected by natural wind, and equipment in mines, cement plants and other harsh environments are long-term exposed to high dust. These actual factors, such as changing aerodynamic loads and uneven dust attachment on the blade surface, can significantly change the actual balance state of the rotor. However, the existing dynamic balance detection devices cannot effectively simulate these combined working conditions. They usually perform detection in a steady state and ideal environment without interference, which leads to that a well-performing impeller in detection may produce severe vibration again due to aerodynamic interference or dust attachment when installed in equipment running in actual environment. This makes the detection result unreliable and unable to predict and correct the imbalance problem of the rotor under real working conditions, which poses a hidden danger to long-term safe operation of the equipment.

[0004] Therefore, the present application provides a dynamic balance detection device for construction engineering construction machinery to solve the above-mentioned problems. SUMMARY

[0005] The present application aims to provide a dynamic balance detection device for construction engineering construction machinery, which can actively simulate dynamic balance detection in real working environment and reproduce dynamic airflow, wind direction change and dust environment and other comprehensive factors, so as to more accurately evaluate the dynamic balance performance of the rotating part under actual working conditions when detecting the rotating part, thereby solving the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A kind of construction engineering construction machinery dynamic balance detection device, including base and base frame, first motor is fixed on the base, the output of the first motor is provided with main shaft, the impeller to be carried out dynamic balance detection is cooperatively installed on the main shaft;

[0008] The base frame is fixedly installed with the blower for generating analog air flow, the blower is fixed with the air guide pipe that is opposite the blade arrangement of impeller, the blower includes the second motor fixed on the base frame, the output of the second motor is provided with the fan shaft, the fan blade is fixed on the fan shaft and is rotatably installed in the blower housing, the air guide plate shaft is rotatably installed in the air guide pipe, and the air guide plate is fixed on the air guide plate shaft in the air guide pipe inner cavity.

[0009] The fan shaft and the air guide plate shaft are matched by the first linkage structure, and the fan shaft rotates to drive the air guide plate shaft to periodically reciprocate clockwise and counterclockwise to realize the reciprocating swing of the air guide plate.

[0010] The base frame is also provided with a spiral feeding mechanism for continuously conveying test dust into the air guide pipe inner cavity.

[0011] The first linkage structure includes a transmission rod rotatably installed on the base frame by a bearing, the transmission rod and the fan shaft are matched by a chain wheel mechanism, and the fan shaft rotates to drive the transmission rod to rotate synchronously.

[0012] The chain wheel mechanism includes a driving chain wheel fixed on the fan shaft and a driven chain wheel fixed on the transmission rod, and the driving chain wheel and the driven chain wheel are matched by a closed transmission chain.

[0013] The swing mechanism includes an eccentric wheel fixed on the transmission rod, the eccentric wheel is fixed with an eccentric pin shaft, the air guide plate shaft is fixed with a swing arm, the swing arm is provided with a long circular guide sliding groove, and the eccentric pin shaft of the eccentric wheel is movably inserted and clamped in the guide sliding groove.

[0014] A dynamic balancing testing device for construction machinery as described above: The screw feeding mechanism includes a storage bin fixed on a base frame, a feeding hopper connected to the inside of the storage bin fixed on the storage bin, a screw feeding shaft rotatably installed inside the storage bin, screw blades for pushing dust fixed on the screw feeding shaft, a discharge pipe connected to the inside of the air duct fixed at one end of the storage bin, and the screw feeding shaft and the transmission rod are connected by a worm gear mechanism, so that when the transmission rod rotates, it will drive the screw feeding shaft to rotate synchronously.

[0015] A dynamic balancing testing device for construction machinery as described above: the worm gear mechanism includes a worm fixed on a transmission rod and a worm wheel fixed on a screw feed shaft, wherein the worm meshes with the worm wheel.

[0016] The dynamic balancing testing device for construction machinery described above: the first motor and the second motor are both variable frequency speed control motors, which are linked and controlled by an electrical control system so that the speed of the impeller and the intensity of the simulated airflow can be matched and changed according to a preset program.

[0017] A dynamic balancing testing device for construction machinery as described above: a transparent observation window is provided on the side wall of the feeding hopper, and a scale for indicating the remaining amount of dust is provided on the side of the observation window.

[0018] As described above, a dynamic balancing testing device for construction machinery: the eccentric pin is detachably mounted on the eccentric wheel, and its eccentric distance from the center of the eccentric wheel is adjustable. By adjusting the eccentric pin with different eccentric distances, the swing amplitude of the guide plate shaft can be changed.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention integrates dynamic airflow simulation, wind direction change simulation and dust environment simulation into one. When in use, the impeller to be tested is installed on the main shaft. The blower blows airflow onto the impeller to simulate the basic aerodynamic load. At the same time, through the design of the linkage structure and the reciprocating oscillating guide plate, the direction of the airflow blown toward the impeller can oscillate periodically, reproducing the change-direction wind effect in actual work. Combined with the continuous injection of dust into the guide duct by the screw feeding mechanism, the airflow blown toward the impeller is mixed with dust, simulating the dust adhesion effect in harsh environments. Thus, by setting up this comprehensive simulation of composite working conditions, the dynamic balance test results can more realistically reflect the state of the impeller in actual operation, greatly improving the accuracy and reliability of the test.

[0020] In addition, the core of the present application is that the mechanical linkage design, the fan shaft of the blower is directly driven to the guide vane shaft through the first linkage structure, and the guide vane moves, which ensures that the airflow change and the wind power generation source are derived from the same power and strictly synchronized, at the same time, the power also drives the spiral feeding shaft to work through the transmission rod and the worm gear mechanism, so that the dust conveying rate matches the fan speed. This single power source, multi-output linkage mode not only has compact structure and reliable transmission, but also ensures that all simulated environmental factors including wind power, wind direction and dust change are consistent during each detection, and perfectly reproduces the real working scene. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0022] Figure 2 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 1 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0023] Figure 3 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 1 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0024] Figure 4 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 3 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0025] Figure 5 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 3 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0026] Figure 6 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 5 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0027] Figure 7 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0028] Figure 8 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0029] Figure 9 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 6 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery.

[0030] Figure 10 It is a schematic diagram of the overall structure of a dynamic balance detection device for a construction engineering construction machinery. Figure 9The exploded partial structural schematic view.

[0031] In the figure: 1, base; 2, base frame; 3, first motor; 4, main shaft; 5, impeller; 6, air blower; 7, air guide pipe; 8, second motor; 9, fan shaft; 10, fan blade; 11, guide plate shaft; 12, guide plate; 13, transmission rod; 14, driving sprocket; 15, driven sprocket; 16, transmission chain; 17, eccentric wheel; 18, eccentric pin shaft; 19, swing arm; 20, guide chute; 21, storage bin; 22, feeding hopper; 23, discharge pipe; 24, screw feeding shaft; 25, screw blade; 26, worm; 27, worm gear. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0033] Please refer to Figures 1-10 As an embodiment of the present application, as an embodiment of the present application, a dynamic balance detection device for construction engineering construction machinery, comprising a base 1 and a base frame 2, the base 1 is fixed with a first motor 3, the output end of the first motor 3 is provided with a main shaft 4, the main shaft 4 is cooperatively installed with an impeller 5 to be subjected to dynamic balance detection;

[0034] The base frame 2 is fixedly installed with an air blower 6 for generating simulated air flow, the air blower 6 is fixed with an air guide pipe 7 opposite to the blade arrangement of the impeller 5, the air blower 6 comprises a second motor 8 fixed on the base frame 2, the output end of the second motor 8 is provided with a fan shaft 9, the fan shaft 9 is fixed with a fan blade 10 rotatably installed in the housing of the air blower 6, the air guide pipe 7 is rotatably installed with a guide plate shaft 11 penetrating through the air guide pipe 7, the guide plate shaft 11 is fixed with a guide plate 12 located in the inner cavity of the air guide pipe 7;

[0035] The fan shaft 9 and the guide plate shaft 11 are cooperatively connected through a first linkage structure, when the fan shaft 9 rotates, the guide plate shaft 11 will be driven to periodically reciprocate clockwise and counterclockwise to realize the reciprocating swing of the guide plate 12;

[0036] The base frame 2 is further provided with a screw feeding mechanism for continuously conveying test dust into the inner cavity of the air guide pipe 7.

[0037] In use, in the embodiment, the impeller 5 to be detected is fitted on the main shaft 4, the first motor 3 and the second motor 8 are electrically connected with an external power source through wires, the first motor 3 is started, the impeller 5 is driven to rotate to a working speed by the main shaft 4, and a real running state is simulated; at the same time, the second motor 8 is started, the fan rotating shaft 9 and the fan blade 10 are driven to rotate, and a stable simulated airflow is generated; the airflow blows to the rotating impeller 5 through the air guide pipe 7, and a basic aerodynamic load is formed; in order to realize dynamic change of the airflow, the key first linkage structure starts to work, the rotating movement of the fan rotating shaft 9 is transmitted and converted into periodic reciprocating rotation of the air guide plate rotating shaft 11 through the first linkage structure, so that the air guide plate 12 fixed thereon reciprocates at the air outlet of the air guide pipe 7, the direction of the airflow blowing to the impeller 5 changes constantly, the turbulent flow or variable wind effect in the actual work is simulated, in addition, the spiral feeding mechanism works, and the test dust is continuously delivered into the airflow in the air guide pipe 7; the dust is attached to the blades of the rotating impeller 5 with the airflow, the mass distribution change caused by uneven attachment in the dust environment is simulated, so that the three functions of stable airflow generation, dynamic wind direction change and quantitative dust delivery are combined and applied to the measured impeller 5, so that the most severe working condition of the impeller 5 in the actual work can be accurately reproduced in the laboratory environment, and more real and reliable evaluation of the dynamic balance performance of the impeller 5 can be realized.

[0038] As a further scheme of the application, the first linkage structure comprises a transmission rod 13 rotatably installed on the base frame 2 through a bearing, the transmission rod 13 is matched with the fan rotating shaft 9 through a chain wheel mechanism, and the fan rotating shaft 9 drives the transmission rod 13 to rotate synchronously when the fan rotating shaft 9 rotates; the transmission rod 13 is matched with the air guide plate rotating shaft 11 through a swing mechanism, and the transmission rod 13 drives the air guide plate rotating shaft 11 to reciprocate periodically clockwise and counterclockwise when the transmission rod 13 continuously rotates.

[0039] In the embodiment, the transmission rod 13 is used as an intermediate transmission component, and the power of the fan rotating shaft 9 is transmitted to the swing mechanism; the continuous rotating movement of the fan rotating shaft 9 drives the transmission rod 13 to rotate synchronously through the chain wheel mechanism, and the transmission rod 13 converts the rotating movement into the reciprocating swing required by the air guide plate rotating shaft 11 through the swing mechanism, so that the conversion of the power transmission path and the change of the movement form are realized, and the automation and synchronization of the wind direction change are ensured.

[0040] As a further scheme of the application, the chain wheel mechanism comprises a driving chain wheel 14 fixed on the fan rotating shaft 9 and a driven chain wheel 15 fixed on the transmission rod 13, and the driving chain wheel 14 and the driven chain wheel 15 are matched and driven through a closed transmission chain 16.

[0041] In this embodiment, the sprocket mechanism provides stable and reliable synchronous transmission. When the fan shaft 9 rotates, the driving sprocket 14 rotates synchronously with the fan shaft 9. When the driving sprocket 14 rotates, the driving sprocket 14 and the driven sprocket 15 are matched and driven through a closed transmission chain 16, thereby driving the driven sprocket 15 to rotate. When the driven sprocket 15 rotates, the transmission rod 13 rotates at the same angular velocity.

[0042] As a further scheme of the present application, the oscillating mechanism includes an eccentric wheel 17 fixed on the transmission rod 13, an eccentric pin shaft 18 fixed on the eccentric wheel 17, an oscillating arm 19 fixed on the guide vane shaft 11, and a long circular guide slot 20 formed in the oscillating arm 19. The eccentric pin shaft 18 is movably inserted into and clamped in the guide slot 20.

[0043] In this embodiment, when the transmission rod 13 rotates, the eccentric wheel 17 rotates synchronously, and the eccentric pin shaft 18 moves in a circular motion. The component of the circular motion of the eccentric pin shaft 18 is converted into the reciprocating oscillation of the oscillating arm 19 and the guide vane shaft 11 fixed thereto through the sliding of the eccentric pin shaft 18 in the guide slot 20 of the oscillating arm 19. When the guide vane shaft 11 reciprocating oscillates, the guide vane 12 reciprocating oscillates.

[0044] As a further scheme of the present application, the spiral feeding mechanism includes a storage bin 21 fixed on the base frame 2, a feeding hopper 22 fixed on the storage bin 21 and communicating with the inside of the storage bin 21, a spiral feeding shaft 24 rotatably installed in the storage bin 21, and spiral blades 25 fixed on the spiral feeding shaft 24 for pushing dust. One end of the storage bin 21 is fixed with a discharge pipe 23 communicating with the inside of the air guide pipe 7. The spiral feeding shaft 24 and the transmission rod 13 are matched through a worm gear mechanism, so that when the transmission rod 13 rotates, the spiral feeding shaft 24 rotates synchronously.

[0045] In this embodiment, the rotational power of the transmission rod 13 is transmitted to the spiral feeding shaft 24 through the worm gear mechanism to drive the spiral feeding shaft 24 to rotate synchronously. When the spiral feeding shaft 24 rotates, the spiral blades 25 rotate to uniformly and quantitatively push the dust falling into the storage bin 21 from the feeding hopper 22 to the discharge pipe 23, and finally into the airflow in the air guide pipe 7. This design ensures that the dust feeding rate is proportional to the rotational speed of the blower 6, simulating a real dust environment with airflow.

[0046] As a further scheme of the present application, the worm gear mechanism includes a worm 26 fixed on the transmission rod 13 and a worm gear 27 fixed on the spiral feeding shaft 24. The worm 26 and the worm gear 27 are meshed.

[0047] In this embodiment, the transmission rod 13 rotates to drive the worm 26 to rotate, and the worm 26 drives the worm gear 27 to rotate through meshing, thereby driving the spiral feeding shaft 24 to rotate. The worm gear mechanism has the advantages of stable transmission, low noise, compact structure, and can realize the conversion of vertical transmission. More importantly, its inherent single-stage large transmission ratio characteristic makes the rotation speed of the spiral feeding shaft 24 much lower than that of the transmission rod 13, thereby realizing slow and quantitative feeding of dust, avoiding overfeeding or insufficient feeding, and accurately controlling the test conditions.

[0048] As a further scheme of the present application, the first motor 3 and the second motor 8 are both variable frequency speed regulation motors, which are linked and controlled by the electrical control system, so that the rotation speed of the impeller 5 and the intensity of the simulated airflow can be matched and changed according to a preset program.

[0049] In this embodiment, the variable frequency speed regulation motor is controlled by the electrical control system, so that the device has high intelligence and flexibility, and complex test programs can be preset, such as simulating the airflow changes corresponding to different stages of the impeller 5 starting, accelerating, steady speed, and decelerating, or simulating different load combinations, which greatly expands the detection range and the accuracy of application.

[0050] As a further scheme of the present application, the sidewall of the feeding hopper 22 is provided with a transparent observation window, and the side of the observation window is provided with a scale for indicating the remaining amount of dust.

[0051] In this embodiment, the transparent observation window cooperates with the scale, so that the operator can intuitively and quickly monitor the remaining amount of dust in the feeding hopper 22 without interrupting the test, which facilitates timely replenishment, ensures the feasibility and stability of long-time continuous test, and improves the ease of use of the equipment.

[0052] As a further scheme of the present application, the eccentric pin shaft 18 is detachably installed on the eccentric wheel 17, and the eccentric distance from the center of the eccentric wheel 17 is adjustable. The swing amplitude of the flow guide plate rotating shaft 11 is changed by adjusting the eccentric pin shaft 18 with different eccentric distances.

[0053] In this embodiment, by adjusting the eccentric pin shaft 18 with different eccentric distances, the swing stroke of the swing arm 19 can be changed, so as to accurately control the swing angle of the flow guide plate 12, so as to simulate different intensity of wind direction change working conditions, and enhance the applicability of the device and the coverage of the test scene.

[0054] The working principle of the application is: the dynamic balance detection device of the construction engineering construction machinery of the application can be used in a closed space environment when detecting the dynamic balance of the impeller. First, the impeller 5 to be detected is fitted and installed on the main shaft 4. The first motor 3 and the second motor 8 are connected to the power supply. After the whole device is started, the first motor 3 and the second motor 8 work synchronously. The first motor 3 drives the impeller 5 to rotate to the working speed through the main shaft 4, simulating the real running state. At the same time, the second motor 8 drives the fan shaft 9 and the fan blade 10 to rotate to generate stable airflow. The airflow blows to the impeller 5 through the air duct 7 to form the basic aerodynamic load. In order to realize dynamic wind direction simulation, the rotation of the fan shaft 9 drives the guide vane shaft 11 to make periodic reciprocating rotation through the first linkage structure. The guide vane 12 fixed thereon swings at the outlet of the air duct 7, so that the airflow direction continuously changes, simulating the variable wind effect in actual work. At the same time, the transmission rod 13 in the first linkage structure drives the spiral feeding shaft 24 in the spiral feeding mechanism to rotate through the worm gear mechanism, and drives the spiral blade 25 to quantitatively push the test dust in the storage bin 21 into the airflow in the air duct 7. The dust and the variable airflow act on the surface of the rotating impeller 5 together, simulating the uneven dust adhesion working condition. Through the synchronous coupling effect of the three functions, the device accurately reproduces the comprehensive stress state of the impeller in the actual harsh working condition in the laboratory environment, so as to realize more real and reliable evaluation of the dynamic balance performance of the impeller.

[0055] The above examples are exemplary rather than limiting, and the technical solutions of the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application.

Claims

1. A dynamic balancing testing device for construction machines, comprising a base (1) and a pedestal (2), characterized in that, The base (1) is fixed with a first motor (3), the output end of the first motor (3) is provided with a main shaft (4), the main shaft (4) is fitted with a impeller (5) to be balanced, which is detected; The base frame (2) is fixedly provided with a blower (6) for generating simulated airflow, the blower (6) is fixedly provided with a air guide pipe (7) opposite to the blade of the impeller (5), the blower (6) comprises a second motor (8) fixed on the base frame (2), the output end of the second motor (8) is provided with a fan shaft (9), the fan shaft (9) is fixedly provided with a fan blade (10) rotatably installed in the housing of the blower (6), the air guide pipe (7) is rotatably provided with a guide vane shaft (11) penetrating through the air guide pipe (7), the guide vane shaft (11) is fixedly provided with a guide vane (12) in the inner cavity of the air guide pipe (7); The fan shaft (9) and the guide vane shaft (11) are connected through a first linkage structure, when the fan shaft (9) rotates, the guide vane shaft (11) rotates periodically clockwise and counterclockwise to realize the reciprocating swing of the guide vane (12); The base frame (2) is further provided with a spiral feeding mechanism for continuously feeding test dust into the inner cavity of the air guide pipe (7); The first linkage structure comprises a transmission rod (13) rotatably installed on the base frame (2), the transmission rod (13) and the fan shaft (9) are connected through a chain wheel mechanism, when the fan shaft (9) rotates, the transmission rod (13) rotates synchronously; the transmission rod (13) and the guide vane shaft (11) are connected through a swing mechanism, when the transmission rod (13) rotates continuously, the guide vane shaft (11) rotates periodically clockwise and counterclockwise; The spiral feeding mechanism comprises a storage bin (21) fixed on the base frame (2), the storage bin (21) is fixedly provided with a feeding hopper (22) in communication with the inside of the storage bin (21), a spiral feeding shaft (24) is rotatably installed in the storage bin (21), the spiral feeding shaft (24) is fixedly provided with a spiral blade (25) for pushing dust, one end of the storage bin (21) is fixedly provided with a discharge pipe (23) in communication with the inside of the air guide pipe (7), the spiral feeding shaft (24) and the transmission rod (13) are connected through a worm gear mechanism, so that when the transmission rod (13) rotates, the spiral feeding shaft (24) rotates synchronously.

2. A dynamic balance testing device for a construction machine according to claim 1, wherein The chain wheel mechanism comprises a driving chain wheel (14) fixed on the fan shaft (9) and a driven chain wheel (15) fixed on the transmission rod (13), the driving chain wheel (14) and the driven chain wheel (15) are connected through a closed transmission chain (16).

3. A dynamic balancing testing device for construction machines according to claim 1, characterized in that, The oscillation mechanism comprises an eccentric wheel (17) fixed on the transmission rod (13), an eccentric pin shaft (18) fixed on the eccentric wheel (17), an oscillating arm (19) fixed on the guide vane rotating shaft (11), and a long circular guide sliding groove (20) formed in the oscillating arm (19); the eccentric pin shaft (18) on the eccentric wheel (17) is movably inserted into and clamped in the guide sliding groove (20).

4. A dynamic balancing testing device for a construction machine according to claim 3, wherein The worm gear mechanism comprises a worm (26) fixed on the transmission rod (13) and a worm wheel (27) fixed on the screw feeding shaft (24), and the worm (26) is engaged with the worm wheel (27).

5. A dynamic balancing testing device for construction machines according to claim 1, characterized in that, The first motor (3) and the second motor (8) are variable frequency speed regulating motors, which are linked and controlled by an electrical control system, so that the rotating speed of the impeller (5) and the intensity of the simulated air flow can be matched and changed according to a preset program.

6. A dynamic balancing testing device for construction machines according to claim 1, wherein A transparent observation window is arranged on the sidewall of the feeding hopper (22), and a scale is arranged on the side of the observation window to indicate the residual amount of dust.

7. A dynamic balancing testing device for a construction machine according to claim 3, wherein The eccentric pin shaft (18) is detachably mounted on the eccentric wheel (17), and the eccentric distance from the center of the eccentric wheel (17) is adjustable; the oscillation amplitude of the guide vane rotating shaft (11) is changed by adjusting the eccentric pin shaft (18) with different eccentric distances.

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