Dynamic balance test tool for blower impeller

Abstract

The invention relates to the technical field of impeller dynamic balance, and particularly discloses a dynamic balance test tool for an air blower impeller. According to the scheme, the stepped shaft column and the transition circular truncated cone structure of the multi-aperture abutting tool are designed, so that impellers with different apertures can be sleeved into corresponding shaft sections step by step along the rotating shaft. A laser sensor of the light detection mechanism abuts against the surface of the shaft column through an elastic abutting assembly, a laser beam is emitted in the circumferential direction of the shaft column and is emitted to a gap between an inner hole of the impeller and the matching face of the shaft column, a receiving end recognizes the 0.05 mm-level assembly gap through the difference of the reflected light intensity, and if the receiving end can receive very strong reflected light, the receiving end judges that the assembly gap is smaller than the 0.05 mm-level assembly gap. The impeller and the shaft column are in close fit, and the installation quality is good. According to the design, the impeller with more than 50% of aperture difference can be adapted without replacing a tool, the test preparation time is greatly shortened, meanwhile, manual touch detection errors and nonlinear vibration under high-speed rotation are eliminated, and the dynamic balance test precision reaches the national standard.

Description

Technical Field

[0001] This application relates to the technical field of impeller dynamic balancing, and in particular to a dynamic balancing test tooling for a blower impeller. Background Art

[0002] As a high-speed rotating component, the dynamic balance performance of a blower impeller directly affects the operating efficiency, vibration and noise level, and equipment life of the blower. Due to factors such as casting errors, uneven material density, or assembly deviations, the impeller is bound to have an asymmetric mass distribution during the manufacturing process. To eliminate such unbalance, it is necessary to conduct a dynamic balance test on the impeller before leaving the factory, and through counterweight correction, make it reach the balance accuracy level specified by standards such as ISO 1940 at the rated speed, so as to avoid faults such as bearing wear and blade fracture caused by excessive vibration of the equipment.

[0003] In the current mainstream dynamic balance test process, the operator needs to select a matching rotating shaft tooling according to the size of the impeller center shaft hole. For example, for an impeller with a shaft hole of φ30mm, a rotating shaft with a tolerance grade of φ30H7 / g6 needs to be installed, while for a 50mm shaft hole, the rotating shaft needs to be replaced with a φ50mm one. During installation, the rotating shaft needs to be tightly fitted with the impeller hole wall by tightening the end face bolts or adjusting the hydraulic expansion sleeve, and then the impeller is manually shaken to evaluate whether there is an assembly gap. During the test, an eddy current displacement sensor or a contact probe fixed on the rack is used to monitor the radial runout of the impeller. However, due to the fixed installation position of the sensor, when the outer diameter of the impeller changes by more than 200mm, it is necessary to readjust the sensor spacing or even replace the detection module. For example, the dynamic balance test tooling for a water pump impeller disclosed in the utility model patent with the publication number CN203337322U proposes that when the existing test tooling conducts dynamic balance tests on impellers of different types and specifications, different equipment needs to be selected, which not only increases the cost, but also is cumbersome to operate and has low efficiency.

[0004] Therefore, the above method faces multiple restrictions in practical applications: First, the frequent replacement of the rotating shaft tooling results in the test preparation time accounting for more than 60% of the overall operation cycle, greatly reducing the test efficiency of mixed-line production of multi-specification impellers; Second, the reliability of manually evaluating the assembly gap is insufficient, and a micro-gap (such as less than 0.05mm) is difficult to identify by touch or visually, but when the rotational speed exceeds 8000r / min, the non-linear vibration caused by such a gap will cause the deviation of the dynamic balance test result to be as high as 15%-20%; Third, the spatial adaptability of traditional sensors is poor, and they cannot be compatible with the test requirements of impellers with a shaft hole difference exceeding 50% on a single station, forcing enterprises to purchase multiple sets of detection equipment, significantly increasing the cost investment. These systematic defects have become the key bottlenecks restricting the upgrade of the dynamic balance test of blower impellers to intelligence and flexibility. Summary of the Invention

[0005] In order to enable the blower impeller to overcome the various defects mentioned above during the dynamic balancing test, the present application provides a dynamic balancing test tool for the blower impeller.

[0006] The present application provides a blower impeller dynamic balancing test fixture, which adopts the following technical solution: A dynamic balancing test fixture for a blower impeller, comprising a mounting platform, on which a multi-aperture abutment fixture capable of adapting to impellers of multiple sizes is mounted, one side of the multi-aperture abutment fixture is provided with a translation and rotation abutment mechanism for driving the multi-aperture abutment fixture to translate and rotate, and the other side is rotatably provided with an abutment disk for abutting against a side of the impeller away from the translation and rotation abutment mechanism; The multi-aperture abutment tooling includes shaft columns of different sizes and transition truncated cones integrally connected to adjacent shaft columns, the length of each shaft column is greater than the thickness of an impeller of corresponding size, and the diameters of both ends of the transition truncated cone are respectively consistent with the diameters of the shaft columns connected thereto; A plurality of light detection mechanisms are evenly spaced on the abutment disk. When the impeller is matched with the corresponding shaft column, the detection end of the light detection mechanism can abut against the corresponding side wall of the shaft column and can detect the gap between the impeller and the multi-aperture abutment tooling.

[0007] By adopting the above technical solution, this solution designs a stepped shaft column and transition cone structure of a multi-aperture clamping tooling, so that impellers with different apertures can be inserted into the corresponding shaft sections step by step along the rotating shaft. The length of the shaft column is greater than the thickness of the impeller, ensuring that the rear end face of the impeller installation and the shaft column retain detection space. The laser sensor of the light detection mechanism abuts the surface of the shaft column through an elastic clamping component, and the laser beam is emitted along the circumference of the shaft column and directed to the gap between the inner hole of the impeller and the matching surface of the shaft column. The receiving end identifies the 0.05mm assembly gap through the difference in reflected light intensity. If the receiving end can receive strong reflected light, it means that the impeller and the shaft column are tightly matched, indicating that the installation quality is good. This design can adapt to impellers with aperture differences of more than 50% without changing the tooling, and the test preparation time is greatly reduced. At the same time, two sets of lasers are used to synchronously monitor the uniformity of the circumferential gap, and the tight fit quality is fed back in real time, eliminating manual touch detection errors and nonlinear vibrations under high-speed rotation, so that the dynamic balancing test accuracy reaches the ISO 1940G6.3 standard.

[0008] Optionally, the light detection mechanism includes a laser emitting end and a laser receiving end, and the light detection mechanism is provided with two groups, the two laser emitting ends and the two laser receiving ends are arranged in four equal distributions along the center of the disk surface of the abutting disk, and the laser emitting end and the laser receiving end are adjacent and perpendicular to each other; A plurality of elastic tightening components for elastically abutting against each laser emitting end and laser receiving end are arranged on the abutting disc. When the impeller is completely and properly installed on the corresponding shaft column, each of the elastic tightening components drives the corresponding laser emitting end and laser receiving end to abut against the side wall of the same shaft column, and the laser emitted by the laser emitting end can be received by the adjacent and corresponding laser receiving end.

[0009] By adopting the above technical solution, two groups of laser emitting / receiving ends are arranged at equal intervals of 90° in a four-way distribution, and adjacent lasers are vertically arranged. The spring pre-tightening force of the elastic tightening component pushes the mounting frame to move radially along the abutting disc, so that the end of the sensor is closely attached to the surface of the shaft column. When the impeller is completely and properly installed, the two groups of laser emitting / receiving ends form a cross-detection network. By symmetrically arranging and evenly applying the tightening force, the radial offset of the shaft column caused by the eccentric installation of the impeller is compensated. The double emitting / receiving ends are redundant backups for each other. When a single group fails, the clearance distribution can still be reconstructed through the data of the remaining group, greatly improving the system reliability, reducing the detection blind area, accurately identifying local interference failure, and avoiding test result errors caused by minor assembly deviations.

[0010] Optionally, a socket for inserting the multi-aperture tightening tool is provided at the center of the abutting disc. Slots corresponding to each laser emitting end and laser receiving end are provided on the inner wall of the abutting disc where the socket is located. Each of the elastic tightening components is installed in the corresponding slot. The laser emitting end and the laser receiving end are installed at the end of the corresponding elastic tightening component and can extend into the socket from the opening of the corresponding slot.

[0011] By adopting the above technical solution, when the impeller is tightly fitted with the shaft column, one side of the impeller abuts against the disc surface of the abutting disc at this time. If the laser emitting end and the laser receiving end are installed on the disc surface of the abutting disc, the impeller will cause mechanical pressing on the laser emitting end and the laser receiving end, which is likely to cause damage to the laser emitting end and the laser receiving end. Moreover, there may be an intermittent gap between the laser emitting end, the laser receiving end and the disc surface of the abutting disc, which is likely to cause a large error in the dynamic balance test when the dynamic balance test is carried out. Installing the laser emitting end and the laser receiving end inside the abutting disc can avoid the above defects and make the dynamic balance test result more accurate.

[0012] Optionally, the elastic tightening component includes a mounting frame, an elastic member and a first pressure sensor. The mounting frame is slidably installed in the slot. The laser emitting end and the laser receiving end are installed on the mounting frame. One end of the elastic member is connected to the mounting frame, and the other end is connected to the first pressure sensor. The first pressure sensor is fixed on the inner wall of the slot.

[0013] By adopting the above technical solution, the mounting frame of the elastic clamping assembly slides in the slot through the linear guide rail, and the first pressure sensor monitors the clamping force value in real time. The four first pressure sensors can detect the elastic force applied by the spring, so as to determine whether the mounting frame is in good contact with the peripheral wall of the shaft column, and can detect whether the shaft column is always located in the accurate detection position based on the data of the two symmetrical first pressure sensors. If the values ​​between the symmetrical first pressure sensors are different, it means that the shaft column is not in the correct position for the test. At this time, the measured dynamic balancing test error will also be large, but this problem can be avoided as much as possible by using symmetrical first pressure sensors.

[0014] Optionally, an avoidance groove is provided on the peripheral wall of each shaft column close to the side of the mounting frame, the length of the avoidance groove on each shaft column is less than the difference between the length of the shaft column and the thickness of an impeller of corresponding size, the end of the mounting frame is arranged to be opposite wedge-shaped inclined surfaces, and the height of the wedge-shaped inclined surfaces along the length direction of the mounting frame is greater than the depth of the avoidance groove, and when the end of the mounting frame abuts against the bottom wall of the avoidance groove, the laser emitted by the laser emitting end is directed toward the tightly fitting connection between the impeller and the shaft column.

[0015] By adopting the above technical solution, when the ends of the laser emitting end and the laser receiving end are in contact with the outer peripheral wall of the shaft column, due to the certain installation height of the laser emitting end and the laser receiving end, that is, the laser emitted by this installation method is difficult to get close to the surface of the shaft column and move along the length direction of the shaft column, making it difficult to reach the section to be detected in the end, and the avoidance groove can make the laser emitted by the laser emitting end accurately irradiate the matching interface between the impeller inner control and the shaft column, making the detection result more accurate. The wedge-shaped inclined surface allows the mounting frame to be moved out of the avoidance groove, which is convenient for continuous movement on the shaft column and the transition round table.

[0016] Optionally, a fixed disk is installed at one end of the multi-aperture abutment tooling away from the abutment disk, and a connecting cylinder is coaxially rotatably installed at one side of the fixed disk away from the multi-aperture abutment tooling; The translational rotation clamping mechanism includes a rotating part and a telescopic part. The rotating part is installed in the connecting tube and the output end is coaxially fixed with the fixed disk. The telescopic part is installed on the side of the connecting tube away from the fixed disk and is fixedly connected to the outer wall of the connecting tube.

[0017] By adopting the above technical solution, when the impeller needs to be clamped and fixed, the telescopic member drives the connecting tube and the fixed disk to move together, thereby driving the end of the multi-aperture clamping tool to insert into the impeller aperture. When a dynamic balancing test is required, the rotating member drives the fixed disk to rotate, so that the multi-aperture clamping tool drives the clamped impeller to rotate.

[0018] Optionally, the telescopic members are provided in multiple groups, and multiple groups of fixing frames are provided on the outer wall of the connecting tube corresponding to the telescopic members, and a second pressure sensor is provided between each fixing frame and the corresponding end of the telescopic member.

[0019] By adopting the above technical solution, the second pressure sensor can detect the telescopic state of each telescopic member, so that the force of the multi-aperture clamping fixture is the same, reducing the error in the dynamic balancing test. When the impeller is installed on the shaft column, since the diameter of the shaft column remains unchanged, the pressure change received by the second pressure sensor will not be particularly obvious when the impeller and the shaft column are plugged together. If the side wall of the impeller moves to abut against the next transition cone, the data received by the second pressure sensor will suddenly change, indicating that the impeller has been fully installed. At this time, the telescopic member can stop telescoping, thereby shutting down in time and reducing damage to the impeller.

[0020] Optionally, a slide rail is installed on the mounting table between the abutment plate and the multi-aperture abutment tooling, a lifting platform is installed on the slide rail, a base is fixed on the top of the lifting platform, a slot for clamping the bottom of the impeller is provided on the top of the base, and a position sensor for detecting the impeller position is provided on the inner wall of the slot.

[0021] By adopting the above technical solution, the slide rail guides the lifting platform to move in the vertical direction, and the base rises to a suitable position. At this time, the impeller is placed in the slot, and the shaft hole of the impeller and the center of the shaft column are aligned, which is convenient for clamping and fixing the shaft column. After the clamping and fixing are completed, the lifting platform descends to separate the base from the impeller, reducing the impact on the dynamic balance test of the impeller.

[0022] Optionally, a disassembly frame for disassembling the impeller is installed on the side of the base facing away from the abutment plate, and the disassembly frame can remove the impeller from the shaft column after the impeller dynamic balancing test is completed.

[0023] By adopting the above technical solution, when the dynamic balancing test is completed, the lifting platform rises so that the base supports the bottom of the impeller. At this time, the telescopic part contracts, driving the impeller to move closer to the disassembly frame. When the disassembly frame abuts against the side wall of the impeller, the impeller can be removed from the shaft column, and the removed bottom support of the impeller is placed in the slot of the base for easy removal by the staff.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. This solution designs the stepped shaft column and transition frustum structure of the multi-aperture clamping tooling, enabling impellers with different apertures to be sleeved onto the corresponding shaft sections along the rotating shaft step by step. The length of the shaft column is greater than the thickness of the impeller to ensure a detection space is reserved between the end face of the impeller after installation and the shaft column. The laser sensor of the light detection mechanism is abutted against the surface of the shaft column through the elastic clamping component. The laser beam is emitted circumferentially along the shaft column and shoots towards the gap between the inner hole of the impeller and the mating surface of the shaft column. The receiving end identifies the assembly gap at the 0.05 mm level through the difference in reflected light intensity. If the receiving end can receive very strong reflected light, it means that the impeller and the shaft column are closely fitted, indicating good installation quality. This design can adapt to impellers with aperture differences of more than 50% without replacing the tooling, greatly reducing the test preparation time. At the same time, the circumferential gap uniformity is monitored synchronously by two groups of lasers, and the tight fit quality is feedback in real time, eliminating the manual touch inspection error and the non-linear vibration under high-speed rotation, so that the dynamic balance test accuracy reaches the ISO 1940 G6.3 level standard; 2. When the impeller is closely fitted with the shaft column, one side of the impeller abuts against the disk surface of the abutting disk. If the laser emitting end and the laser receiving end are installed on the disk surface of the abutting disk, the impeller will cause mechanical pressing on the laser emitting end and the laser receiving end, which is likely to cause damage to the laser emitting end and the laser receiving end. Moreover, there may be an intermittent gap between the laser emitting end, the laser receiving end and the disk surface of the abutting disk, which is likely to cause a large error in the dynamic balance test when the dynamic balance test is carried out. However, installing the laser emitting end and the laser receiving end inside the abutting disk can avoid the above defects and make the dynamic balance test result more accurate; 3. The mounting bracket of the elastic clamping component slides in the slot through the linear guide rail. The first pressure sensor monitors the clamping force value in real time. The four first pressure sensors can detect the elastic force exerted by the spring, so as to judge whether the mounting bracket is in good contact with the circumferential wall of the shaft column, and can detect whether the shaft column is always in the accurate detection position according to the data of two symmetric first pressure sensors. If the values between the symmetric first pressure sensors are different, it means that the shaft column is not in the correct test position, and the error of the dynamic balance test measured at this time will also be very large. However, this problem can be avoided as much as possible by using symmetric first pressure sensors; 4. After the end parts of the laser emitting end and the laser receiving end abut against the outer circumferential wall of the shaft column, due to a certain installation height between the laser emitting end and the laser receiving end, that is to say, the laser emitted in this installation method is difficult to be close to the surface of the shaft column and move along the length direction of the shaft column, making it difficult to reach the desired detection section finally. The opened avoidance groove can enable the laser emitted by the laser emitting end to accurately irradiate on the mating interface between the inner control of the impeller and the shaft column, making the detection result more accurate. The wedge-shaped inclined surface enables the mounting bracket to move out of the avoidance groove, facilitating continuous movement on the shaft column and the transition frustum; 5. The second pressure sensor can detect the telescopic state of each telescopic member, making the force on the multi-aperture pressing tooling the same, reducing the error during the dynamic balance test. When the impeller is installed on the shaft column, since the diameter of the shaft column remains unchanged at this time, when the impeller is inserted and matched with the shaft column, the pressure change received by the second pressure sensor is not particularly obvious. If the side wall of the impeller moves to abut against the next transition frustum, the data received by the second pressure sensor will mutate at this time, indicating that the impeller has been completely installed. At this time, the telescopic member can stop telescoping, so as to stop the machine in time and reduce damage to the impeller. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is the overall structural schematic diagram of the dynamic balance test tooling in the embodiment of the present application; Figure 2 is Figure 1 the overall structural diagram of the multi-aperture pressing tooling in Figure 3 is Figure 1 the internal structural schematic diagram of the abutting disc in Figure 4 is Figure 3 the structural schematic diagram of the light detection mechanism abutting against the circumferential wall of the shaft column in Figure 5 is Figure 1 the structural schematic diagram at the slide rail in

[0027] Reference numerals: 1, mounting table; 11, slide rail; 12, lifting table; 13, base; 131, card slot; 1311, position sensor; 2, multi-aperture pressing tooling; 21, shaft column; 211, avoidance groove; 22, transition frustum; 3, translation and rotation pressing mechanism; 31, rotating member; 32, telescopic member; 4, abutting disc; 41, socket; 42, slot; 5, light detection mechanism; 51, laser emission end; 52, laser receiving end; 6, elastic pressing assembly; 61, mounting frame; 62, elastic member; 63, first pressure sensor; 7, fixed disc; 8, connecting cylinder; 81, fixing frame. Detailed Embodiments

[0028] The following will Figure 1-5 be further described in detail with reference to the

[0029] The embodiment of the present application discloses a dynamic balance test tooling for a blower impeller.

[0030] Reference Figure 1 and Figure 2 A dynamic balancing test fixture for a blower impeller comprises a mounting platform 1, on which a multi-aperture abutting fixture 2 which can be adapted to impellers of multiple sizes is mounted, a translation and rotation abutting mechanism 3 for driving the multi-aperture abutting fixture 2 to translate and rotate is arranged on one side of the multi-aperture abutting fixture 2, and an abutting plate 4 for abutting against a side of the impeller away from the translation and rotation abutting mechanism 3 is rotatably mounted on the other side; Reference Figure 2 and Figure 3 The multi-aperture clamping fixture 2 includes shaft columns 21 of different sizes and transition cones 22 integrally connected to adjacent shaft columns 21. The length of each shaft column 21 is greater than the thickness of an impeller of corresponding size, and the diameters of both ends of the transition cone 22 are respectively consistent with the diameters of the shaft columns 21 connected thereto.

[0031] A plurality of light detection mechanisms 5 are evenly spaced on the abutment disk 4. When the impeller is tightly fitted with the corresponding shaft column 21, the detection end of the light detection mechanism 5 can abut against the side wall of the corresponding shaft column 21 and can detect the gap between the impeller and the multi-aperture abutment fixture 2.

[0032] This solution designs the stepped shaft column 21 and transition cone 22 structure of the multi-aperture clamping fixture 2, so that impellers with different apertures, such as φ30mm to φ80mm, can be inserted into the corresponding shaft sections step by step along the rotating shaft. The length of the shaft column 21 is greater than the thickness of the impeller. For example, a shaft column 21 with a length of 50mm corresponds to an impeller with a thickness of 30mm, ensuring that the detection space is reserved between the rear end face of the impeller installation and the shaft column 21. The laser sensor of the light detection mechanism 5 is abutted against the surface of the shaft column 21 through the elastic clamping component 6. The laser beam is emitted along the circumference of the shaft column 21 and is directed to the gap between the inner hole of the impeller and the matching surface of the shaft column 21. The receiving end identifies the 0.05mm assembly gap through the difference in reflected light intensity. If the receiving end can receive strong reflected light, it means that the impeller and the shaft column 21 are tightly matched, indicating that the installation quality is good.

[0033] This design can adapt to impellers with more than 50% aperture difference without changing tooling, greatly reducing test preparation time. At the same time, two sets of lasers synchronously monitor the uniformity of the circumferential gap, provide real-time feedback on the quality of tight fit, eliminate manual touch errors and nonlinear vibrations under high-speed rotation, and make the dynamic balancing test accuracy reach ISO 1940 G6.3 standard.

[0034] Reference Figure 3 The light detection mechanism 5 includes a laser emitting end 51 and a laser receiving end 52. The light detection mechanism 5 is provided with two groups. The two laser emitting ends 51 and the two laser receiving ends 52 are distributed in four equal groups along the center of the disk surface of the abutting disk 4. The laser emitting end 51 and the laser receiving end 52 are adjacent and perpendicular to each other.

[0035] Reference Figure 3 , a plurality of elastic tightening components 6 for elastically abutting against the laser emission ends 51 and the laser receiving ends 52 are arranged on the abutting disc 4. When the impeller is completely and properly installed on the corresponding shaft column 21, each elastic tightening component 6 drives the corresponding laser emission end 51 and laser receiving end 52 to abut against the side wall of the same shaft column 21, and the laser emitted by the laser emission end 51 can be received by the adjacent and corresponding laser receiving end 52.

[0036] Two groups of laser emission / receiving ends are arranged at equal intervals of 90° and are vertically arranged adjacent to each other. For example, the 0° emission end is paired with the 90° receiving end. The spring pre-tightening force of the elastic tightening component 6 pushes the mounting bracket 61 to move radially along the abutting disc 4, so that the end of the sensor fits closely against the surface of the shaft column 21. When the impeller is completely and properly installed, the two groups of laser emission / receiving ends form a cross detection network, and the abutting force is evenly applied through the symmetrical layout to compensate for the radial offset of the shaft column 21 caused by the eccentric installation of the impeller.

[0037] The dual emission / receiving ends are redundant backups for each other. When a single group fails, the gap distribution can still be reconstructed through the remaining group of data, greatly improving the system reliability, reducing the detection blind area, accurately identifying local interference failures, such as unilateral gap out-of-tolerance, and avoiding test result errors caused by minor assembly deviations.

[0038] Reference Figure 3 and Figure 4 , a socket 41 for inserting the multi-aperture tightening tool 2 is opened at the center of the abutting disc 4. Slots 42 corresponding to the laser emission ends 51 and the laser receiving ends 52 are opened on the inner wall of the abutting disc 4 where the socket 41 is located. Each elastic tightening component 6 is installed in the corresponding slot 42, and the laser emission end 51 and the laser receiving end 52 are installed at the end of the corresponding elastic tightening component 6 and can extend into the socket 41 from the opening of the corresponding slot 42.

[0039] When the impeller is tightly fitted with the shaft column 21, at this time, one side of the impeller abuts against the disc surface of the abutting disc 4. If the laser emission end 51 and the laser receiving end 52 are installed on the disc surface of the abutting disc 4, the impeller will cause mechanical pressing on the laser emission end 51 and the laser receiving end 52, which is likely to cause damage to the laser emission end 51 and the laser receiving end 52, and there may be an intermittent gap between the laser emission end 51, the laser receiving end 52 and the disc surface of the abutting disc 4. When performing the dynamic balance test, it is likely to cause a large error in the dynamic balance test. Installing the laser emission end 51 and the laser receiving end 52 inside the abutting disc 4 can avoid the above defects and make the dynamic balance test result more accurate.

[0040] Reference Figure 3 and Figure 4, the elastic pressing component 6 includes a mounting bracket 61, an elastic member 62, and a first pressure sensor 63. The mounting bracket 61 is slidably mounted in the slot 42. The laser emitting end 51 and the laser receiving end 52 are mounted on the mounting bracket 61. The elastic member 62 is a spring. One end of the elastic member 62 is connected to the mounting bracket 61, and the other end is connected to the first pressure sensor 63. The first pressure sensor 63 is fixed to the inner wall of the slot 42.

[0041] The mounting bracket 61 of the elastic pressing component 6 slides in the slot 42 through a linear guide. The first pressure sensor 63 real-time monitors the value of the pressing force. The four first pressure sensors 63 can detect the elastic force exerted by the spring, so as to judge whether the mounting bracket 61 is in good contact with the peripheral wall of the shaft column 21, and can detect whether the shaft column 21 is always located at the accurate detection position according to the data of two symmetric first pressure sensors 63. If the values between the two symmetric first pressure sensors 63 are different, it means that the shaft column 21 is not in the correct test position. At this time, the dynamic balance test error measured will also be very large. However, this problem can be avoided as much as possible by using the symmetric first pressure sensors 63.

[0042] Further, referring to Figure 1 and Figure 2 , a relief groove 211 is provided on one side of the peripheral wall of each shaft column 21 close to the mounting bracket 61. The length of the relief groove 211 on each shaft column 21 is less than the difference between the length of the shaft column 21 and the thickness of the corresponding impeller. The end of the mounting bracket 61 is provided with opposite wedge-shaped inclined surfaces, and the height of the wedge-shaped inclined surface along the length direction of the mounting bracket 61 is greater than the depth of the relief groove 211. When the end of the mounting bracket 61 abuts against the bottom wall of the relief groove 211, the laser emitted by the laser emitting end 51 is directed at the tight fit connection between the impeller and the shaft column 21.

[0043] After the laser emitting end 51 and the laser receiving end 52 abut against the outer peripheral wall of the shaft column 21, due to a certain installation height between the laser emitting end 51 and the laser receiving end 52, that is to say, the laser emitted in this installation manner is difficult to be close to the surface of the shaft column 21 and move along the length direction of the shaft column 21, making it difficult to reach the desired detection section finally. The provided relief groove 211 can make the laser emitted by the laser emitting end 51 accurately irradiate on the mating interface between the inner control of the impeller and the shaft column 21, making the detection result more accurate. Referring to Figure 4 , the dotted line in the figure is the path of the light emitted by the laser emitting end 51 returning to the adjacent laser receiver 52. Point A in the figure represents the reflection position, that is, the detection position. The wedge-shaped inclined surface enables the mounting bracket 61 to be removed from the relief groove 211, facilitating continuous movement on the shaft column 21 and the transition frustum 22.

[0044] Referring to Figure 1, a fixing plate 7 is installed at one end of the multi-aperture pressing tooling 2 away from the abutting disc 4, and a connecting cylinder 8 is coaxially rotatably installed on one side of the fixing plate 7 away from the multi-aperture pressing tooling 2. The translation and rotation pressing mechanism 3 includes a rotating member 31 and a telescopic member 32. The telescopic member 32 uses an electric telescopic cylinder with a precisely controllable stroke, and the rotating member 31 uses a servo motor. In other feasible embodiments, other methods can also be used. The rotating member 31 is installed inside the connecting cylinder 8 and the output end is coaxially fixed to the fixing plate 7. The telescopic member 32 is installed on one side of the connecting cylinder 8 away from the fixing plate 7 and is fixedly connected to the outer wall of the connecting cylinder 8.

[0045] Multiple groups of telescopic members 32 are provided, and multiple groups of fixing frames 81 are provided on the outer wall of the connecting cylinder 8 corresponding to the telescopic members 32. A second pressure sensor is provided between each fixing frame 81 and the end of the corresponding telescopic member 32.

[0046] When it is necessary to clamp and fix the impeller, the telescopic member 32 drives the connecting cylinder 8 and the fixing plate 7 to move together, thereby driving the end of the multi-aperture pressing tooling 2 to insert into the impeller aperture. When it is necessary to perform a dynamic balance test, the rotating member 31 drives the fixing plate 7 to rotate, so that the multi-aperture pressing tooling 2 drives the clamped and fixed impeller to rotate.

[0047] The second pressure sensor can detect the telescopic state of each telescopic member 32, make the forces on the multi-aperture pressing tooling 2 the same, and reduce the error during the dynamic balance test. When the impeller is installed on the shaft column 21, at this time, since the diameter of the shaft column 21 remains unchanged, when the impeller is inserted and matched with the shaft column 21, the pressure change received by the second pressure sensor is not particularly obvious. If the side wall of the impeller moves to abut against the next transition frustum 22, at this time, the data received by the second pressure sensor will change suddenly, indicating that the impeller has been completely installed. At this time, the telescopic member 32 can stop telescoping, so as to stop the machine in time and reduce damage to the impeller.

[0048] Refer to Figure 4 and Figure 5 , a slide rail 11 is installed on the installation table 1 between the abutting disc 4 and the multi-aperture pressing tooling 2. A lifting table 12 is installed on the slide rail 11. A base 13 is fixed on the top of the lifting table 12. A clamping groove 131 for clamping the bottom of the impeller is opened on the top of the base 13, and a position sensor 1311 for detecting the position of the impeller is provided on the inner wall of the clamping groove 131.

[0049] The slide rail 11 guides the lifting table 12 to move in the vertical direction. When the base 13 rises to a suitable position, at this time, the impeller is placed in the clamping groove 131, and the shaft hole of the impeller and the center of the shaft column 21 can be aligned, which is convenient for clamping and fixing the shaft column 21. When the clamping and fixing are completed, the lifting table 12 descends to separate the base 13 from the impeller, reducing the influence on the dynamic balance test of the impeller.

[0050] Furthermore, a disassembly frame for disassembling the impeller is installed on the side of the base 13 away from the abutment plate 4. After the dynamic balancing test is completed, the lifting platform 12 rises, so that the base 13 supports the bottom of the impeller. At this time, the telescopic member 32 contracts, driving the impeller to move closer to the disassembly frame. When the disassembly frame abuts against the side wall of the impeller, the impeller can be removed from the shaft column 21, and the removed impeller bottom support is placed in the slot 131 of the base 13, which is convenient for the staff to remove.

[0051] During the dynamic balancing test, if there is an unbalanced point, the laser pen can be used to assist in locating the unbalanced point. Then, after the dynamic balancing test is completed, the counterweight is welded, riveted or bolted at the marked phase position, and the material is polished, drilled or cut at the reverse phase position to remove excess mass, so that the blower impeller can be dynamically balanced. Finally, the dynamic balancing test is restarted to test whether it meets the standards until it meets the standards.

[0052] The implementation principle of a dynamic balancing test fixture for a blower impeller in an embodiment of the present application is as follows: This scheme designs a stepped shaft column 21 and a transition cone 22 structure of a multi-aperture tightening fixture 2 so that impellers with different apertures can be gradually inserted into corresponding shaft sections along the rotating shaft.

[0053] The laser sensor of the light detection mechanism 5 is abutted against the surface of the shaft column 21 through the elastic clamping component 6. The laser beam is emitted along the circumference of the shaft column 21 and directed toward the gap between the inner hole of the impeller and the mating surface of the shaft column 21. The receiving end identifies the 0.05mm assembly gap through the difference in reflected light intensity. If the receiving end can receive strong reflected light, it means that the impeller and the shaft column 21 are tightly matched, which means that the installation quality is good.

[0054] This design can adapt to impellers with more than 50% aperture difference without changing tooling, greatly reducing test preparation time. It also eliminates manual touch detection errors and nonlinear vibration under high-speed rotation, making the dynamic balancing test accuracy meet ISO 1940G6.3 standards.

[0055] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dynamic balancing test tool for a blower impeller, characterized in that: The invention comprises a mounting platform (1), on which a multi-aperture abutment tool (2) capable of adapting to impellers of multiple sizes is mounted, one side of the multi-aperture abutment tool (2) is provided with a translation and rotation abutment mechanism (3) for driving the multi-aperture abutment tool (2) to translate and rotate, and the other side is rotatably provided with an abutment plate (4) for abutting against a side of the impeller away from the translation and rotation abutment mechanism (3); The multi-aperture abutment tooling (2) comprises shaft columns (21) of different sizes and transition truncated cones (22) integrally connected to adjacent shaft columns (21), the length of each shaft column (21) being greater than the thickness of an impeller of corresponding size, and the diameters of the two ends of the transition truncated cone (22) being respectively consistent with the diameters of the shaft columns (21) to which they are connected; A plurality of groups of light detection mechanisms (5) are evenly spaced on the abutment disk (4); when the impeller is tightly fitted with the corresponding shaft column (21), the detection end of the light detection mechanism (5) can abut against the side wall of the corresponding shaft column (21) and can detect the gap between the impeller and the multi-aperture abutment fixture (2).

2. The dynamic balancing test fixture for a blower impeller according to claim 1, characterized in that: The light detection mechanism (5) comprises a laser emitting end (51) and a laser receiving end (52), and the light detection mechanism (5) is provided with two groups, the two laser emitting ends (51) and the two laser receiving ends (52) are arranged in four equal distributions along the center of the disk surface of the abutting disk (4), and the laser emitting end (51) and the laser receiving end (52) are adjacent to each other and perpendicular to each other; The abutment disk (4) is provided with a plurality of groups of elastic abutment components (6) for elastically abutting each laser emitting end (51) and each laser receiving end (52); when the impeller is fully adapted and installed on the corresponding shaft column (21), each of the elastic abutment components (6) drives the corresponding laser emitting end (51) and the laser receiving end (52) to abut against the side wall of the same shaft column (21), and the laser emitted by the laser emitting end (51) can be received by the adjacent and corresponding laser receiving end (52).

3. The dynamic balancing test fixture for a blower impeller according to claim 2, characterized in that: A socket (41) for plugging the multi-aperture pressing tool (2) is provided at the center of the contact plate (4), and a slot (42) is provided on the inner wall of the contact plate (4) where the socket (41) is located, corresponding to each laser emitting end (51) and laser receiving end (52), and each elastic pressing assembly (6) is installed in the corresponding slot (42). The laser emitting end (51) and the laser receiving end (52) are installed at the corresponding end of the elastic pressing assembly (6) and can extend into the socket (41) through the opening of the corresponding slot (42).

4. The dynamic balancing test tool for a blower impeller according to claim 3, characterized in that: The elastic pressing component (6) comprises a mounting frame (61), an elastic member (62) and a first pressure sensor (63); the mounting frame (61) is slidably mounted in the slot (42); the laser emitting end (51) and the laser receiving end (52) are mounted on the mounting frame (61); one end of the elastic member (62) is connected to the mounting frame (61) and the other end is connected to the first pressure sensor (63); the first pressure sensor (63) is fixed to the inner wall of the slot (42).

5. The dynamic balancing test tool for a blower impeller according to claim 4, characterized in that: An avoidance groove (211) is provided on a side of the peripheral wall of each shaft column (21) close to the mounting frame (61); the length of the avoidance groove (211) on each shaft column (21) is less than the difference between the length of the shaft column (21) and the thickness of an impeller of corresponding size; the end of the mounting frame (61) is arranged to form opposite wedge-shaped inclined surfaces, and the height of the wedge-shaped inclined surfaces along the length direction of the mounting frame (61) is greater than the depth of the avoidance groove (211); when the end of the mounting frame (61) abuts against the bottom wall of the avoidance groove (211), the laser emitted by the laser emitting end (51) is emitted toward a tightly fitting connection between the impeller and the shaft column (21).

6. The dynamic balancing test tool for a blower impeller according to claim 1, characterized in that: A fixed disk (7) is installed at one end of the multi-aperture abutment fixture (2) away from the abutment disk (4), and a connecting cylinder (8) is coaxially rotatably installed at one side of the fixed disk (7) away from the multi-aperture abutment fixture (2); The translational rotation pressing mechanism (3) comprises a rotating member (31) and a telescopic member (32); the rotating member (31) is installed in the connecting tube (8) and the output end is coaxially fixed with the fixed disk (7); the telescopic member (32) is installed on the side of the connecting tube (8) away from the fixed disk (7) and is fixedly connected to the outer wall of the connecting tube (8).

7. The dynamic balancing test fixture for a blower impeller according to claim 6, characterized in that: The telescopic members (32) are provided in multiple groups, and multiple groups of fixing frames (81) are provided on the outer wall of the connecting tube (8) corresponding to the telescopic members (32), and a second pressure sensor is provided between each fixing frame (81) and the end of the corresponding telescopic member (32).

8. The dynamic balancing test tool for a blower impeller according to claim 1, characterized in that: A slide rail (11) is installed on the mounting platform (1) between the abutment disk (4) and the multi-aperture abutment fixture (2); a lifting platform (12) is installed on the slide rail (11); a base (13) is fixed on the top of the lifting platform (12); a slot (131) for clamping the bottom of an impeller is provided on the top of the base (13); and a position sensor (1311) for detecting the position of the impeller is provided on the inner wall of the slot (131).

9. The dynamic balancing test tool for a blower impeller according to claim 8, characterized in that: A disassembly frame for disassembling the impeller is installed on the side of the base (13) facing away from the abutment plate (4), and the disassembly frame can disassemble the impeller from the shaft column (21) after the impeller dynamic balancing test is completed.

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