Device for testing dynamic balance of subway air-conditioning fan

Abstract

The invention discloses a device for testing dynamic balance of a subway air conditioner fan, and relates to the technical field of fan dynamic balance detection, the device has the advantage of facilitating fine adjustment of the fan, and the key points of the technical scheme are that the device comprises a base and two vibration test supports installed on the base; the top ends of the two vibration test supports are jointly provided with an installation platform used for placing a fan, and the device is characterized in that two opposite pushing mechanisms are arranged between the installation platform and the base, the two pushing mechanisms are respectively connected with a pushing plate, the installation platform is provided with a first communication groove allowing the top end of the corresponding pushing plate to vertically penetrate through, and the first communication groove is communicated with the first communication groove. A plurality of balls used for temporarily bearing the draught fan are arranged at the top end of the push plate, a buffering mechanism is arranged on the push mechanism in a matched mode, and when the push plate is driven by the push mechanism to descend, the buffering mechanism buffers the falling draught fan firstly and then descends along with the push mechanism till the draught fan is disengaged from the installation platform and the draught fan.

Description

Technical Field

[0001] This invention relates to the field of wind turbine balancing testing technology, specifically a device for testing the wind turbine balancing of subway air conditioning systems. Background Technology

[0002] Centrifugal fans are driven fluid machines used to increase gas pressure and transport gas, and are widely used in ventilation, dust removal, and cooling applications. The vibrations generated during fan operation accelerate component wear and fatigue, affecting equipment reliability; therefore, overall mechanical balancing testing is necessary.

[0003] During the overall dynamic balancing test of the wind turbine, the wind turbine is installed on the mounting platform 12 of the testing device, which is supported by the vibration test support 11 (e.g., Figure 10 The vibration test support is equipped with a vibration sensor, and the testing device is also equipped with a laser speed sensor. When the fan is running, the testing device can complete the overall balance status detection by synchronously collecting vibration and speed signals.

[0004] Current testing methods typically require manual hoisting to place the fan onto the mounting platform, followed by bolt securing. After placement, any minor adjustments to the fan's position often involve directly pushing it. However, this method is inconvenient due to the high friction between the fan and the platform. Therefore, the applicant has developed a new technical solution to address these issues during actual production. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a device for testing the dynamic balance of subway air conditioning fans, which has the advantage of facilitating fine-tuning of the fans.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a device for testing the dynamic balance of a subway air conditioning fan, including a base and two vibration test supports mounted on the base. The top of the two vibration test supports is jointly mounted on an installation platform for placing the fan. Two opposing pushing mechanisms are provided between the installation platform and the base, and push plates are respectively connected to the two pushing mechanisms. The installation platform is provided with a first connecting groove for the top of the corresponding push plate to pass vertically through, and the top of the push plate is provided with a number of ball bearings for temporarily supporting the fan. The pushing mechanism is equipped with a buffer mechanism. When the pushing mechanism drives the push plate to descend, the buffer mechanism first buffers the falling fan, and then descends with the pushing mechanism until it loses contact with the installation platform and the fan.

[0007] By adopting the above technical solution, the fan is manually hoisted and placed on the ball bearings of the push plate. The rolling of the ball bearings allows for easy fine-tuning of the fan's plane. After fine-tuning, the pushing mechanism drives the push plate to descend. The buffering mechanism first cushions the fan's descent, reducing impact damage to the installation platform and vibration test support. Most importantly, after the buffering is completed, the buffering mechanism and the push plate can completely descend and detach, no longer contacting the installation platform and the fan. This eliminates any interference that the auxiliary mechanism may cause to the subsequent dynamic balance test (such as the effects of added mass, stiffness, and damping), ensuring the accuracy and reliability of the dynamic balance test data.

[0008] Preferably, the pushing mechanism includes an inverted U-shaped fixed frame, the base is located inside the fixed frame and does not contact the fixed frame, the fixed frame is provided with a vertical plate, and a sliding plate is vertically connected to the vertical plate, the push plate is set at the top of the sliding plate, and the fixed frame is provided with a power source for pushing the sliding plate to move vertically.

[0009] Preferably, a U-shaped connecting plate is vertically slidably connected to the upright plate, the sliding plate is installed on the inner side of the connecting plate, the power source is used to push the connecting plate to move vertically, the buffer mechanism includes a slider vertically slidably connected between the upright plate and the sliding plate, and the slider is located in the connecting plate, the slider is provided with a buffer box, and the buffer box is vertically elastically supported by an elastic component. The mounting platform is provided with a second connecting groove for the top of the buffer plate to pass through, and the slider is provided with a connecting mechanism. During the descent of the push plate, when the buffer plate buffers the falling fan through the elastic component, the connecting mechanism connects the slider to the upright plate. After the buffering is completed, the connecting mechanism releases the connection between the slider and the upright plate and connects the slider to the sliding plate, so that the buffer box and the buffer plate descend with the sliding plate and disengage from the mounting platform and the fan.

[0010] Preferably, the connecting mechanism includes a sliding groove on the side of the slider near the upright plate and a pressing mechanism on the connecting plate. A card plate is horizontally slidably connected in the sliding groove. The upright plate is provided with a first slot that cooperates with the card plate. The sliding groove corresponds to the first slot. One end of the card plate is located in the first slot. The sliding plate is provided with a second slot that cooperates with the card plate. When the sliding plate descends so that the second slot corresponds to the sliding groove, the pressing mechanism is used to push the card plate out of the first slot and push one end of the card plate into the second slot. When the slide plate rises, it drives the slider to rise through the card plate until the top of the buffer box contacts the bottom of the mounting platform. At this time, the slide groove corresponds to the first card slot, and the slide plate continues to rise. At this time, the opening of the second card slot cooperates with the inclined surface of the card plate to push one end of the card plate back into the first card slot.

[0011] Preferably, the extrusion mechanism includes a horizontal plate disposed on the connecting plate, and the horizontal plate is located on the side of the vertical plate away from the slider. The vertical plate has a vertical groove that passes through the first slot. The horizontal plate has an insert plate located in the vertical groove. The insert plate has two inclined surfaces. Inclined surface one is located in the first slot and faces upward, while inclined surface two is located downward. Inclined surface one and inclined surface two are parallel. The bottom end of the insert plate has a right-angled triangular push plate. When the slide plate descends to the second slot and corresponds to the slide groove, the push plate cooperates with inclined surface one to push the insert plate out of the first slot and push one end of inclined surface two of the insert plate into the second slot.

[0012] Preferably, when the slide plate descends and the push plate contacts the first inclined surface, the tip of the second inclined surface corresponds to the second slot.

[0013] Preferably, the elastic component is a compression spring disposed at the bottom of the buffer box.

[0014] Preferably, the top surface of the buffer plate is covered with a rubber layer.

[0015] Preferably, the top of the push plate has a groove that matches the ball bearing, the ball bearing is partially embedded in the groove on the top of the push plate, and the top of the ball bearing protrudes from the upper surface of the push plate.

[0016] Preferably, the bottom edges of both the first and second connecting grooves are chamfered.

[0017] The beneficial effects of this invention are as follows: the ball bearings facilitate fine-tuning of the fan; the buffer mechanism cushions the fan's descent, reducing impact damage to the installation platform and vibration test support; and the buffer mechanism can completely detach from the test system after completing the cushioning, thus not participating in the fan's vibration test, thereby improving the accuracy of the dynamic balance test. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this embodiment; Figure 2 This is a schematic diagram showing the positional distribution of the upright plate, slider, and slide plate within the connecting plate. Figure 3 This is a schematic diagram illustrating the structure of the connecting plate in this embodiment; Figure 4This is a schematic diagram illustrating the structure of the push plate in this embodiment; Figure 5 This is a structural diagram showing the buffer plate being moved below the mounting platform. Figure 6 This is a schematic diagram illustrating the structure of the first card slot in this embodiment; Figure 7 This is a schematic diagram showing one end of the inclined surface two on the card plate entering the second slot. Figure 8 This is a schematic diagram showing the tip of the second inclined surface and the second slot when the push plate contacts the first inclined surface on the card plate. Figure 9 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 10 This is a schematic diagram of the installation platform and vibration test support of the existing testing device.

[0020] Explanation of reference numerals in the attached figures: In the diagram: 1. Base; 11. Vibration test support; 12. Mounting platform; 121. First connecting groove; 122. Second connecting groove; 13. Fan; 14. Chamfered edge; 2. Fixing frame; 21. Vertical plate; 211. First slot; 212. Vertical groove; 22. Slide plate; 221. Push plate; 2211. Ball bearing; 2212. Groove; 222. Second slot; 23. Power source; 24. Connecting plate; 241. Horizontal plate; 2411. Insert plate; 2412. Push plate; 25. Slider; 251. Buffer box; 252. Buffer plate; 253. Slide groove; 2531. Card plate; 2532. Inclined surface one; 2533. Inclined surface two; 254. Elastic component. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A device for testing the dynamic balance of a subway air conditioning fan includes a base 1 and two vibration test supports 11 mounted on the base 1. The tops of the two vibration test supports 11 share a common mounting platform 12 for placing a fan 13. Figure 1 and Figure 3 and Figure 4 Two opposing pushing mechanisms are provided between the installation platform 12 and the base 1, and push plates 221 are connected to the two pushing mechanisms respectively; The mounting platform 12 has a first connecting groove 121 for the top of the corresponding push plate 221 to pass vertically through, such as Figure 3 and Figure 4 The top of the push plate 221 is provided with a number of balls 2211 for temporarily supporting the fan 13. The top of the push plate 221 is provided with a groove 2212 that matches the balls 2211. The balls 2211 are partially embedded in the groove 2212 at the top of the push plate 221, and the top of the balls 2211 protrudes from the upper surface of the push plate 221. The pushing mechanism is equipped with a buffer mechanism. When the pushing mechanism drives the push plate 221 to descend, the buffer mechanism first buffers the falling fan 13, and then descends with the pushing mechanism until it loses contact with the installation platform 12 and the fan 13.

[0023] like Figure 1 and Figure 3 and Figure 4 The fan 13 is manually hoisted and placed on the ball bearings 2211 of the push plate 221. The rolling of the ball bearings 2211 allows for easy fine-tuning of the fan 13's plane. After fine-tuning, the pushing mechanism drives the push plate 221 to descend. The buffer mechanism first cushions the descent of the fan 13, reducing impact damage to the installation platform 12 and vibration test support 11. Most importantly, after the buffering is completed, the buffer mechanism and the push plate 221 can completely descend and detach, no longer contacting the installation platform 12 and the fan 13. This eliminates any interference that the auxiliary mechanism may cause to the subsequent dynamic balance test (such as the effects of added mass, stiffness, and damping), ensuring the accuracy and reliability of the dynamic balance test data.

[0024] like Figure 1 and Figure 2 The pushing mechanism includes an inverted U-shaped fixed frame 2, a base 1 located inside the fixed frame 2 and not in contact with the fixed frame 2, a vertical plate 21 on the fixed frame 2, and a sliding plate 22 vertically connected to the vertical plate 21, a push plate 221 set at the top of the sliding plate 22, and a power source 23 on the fixed frame 2 for pushing the sliding plate 22 to move vertically. By starting the power source 23, the sliding plate 22 is pushed to move vertically downward. At this time, the sliding plate 22 will drive the push plate 221 to descend, and place the fan 13 on the push plate 221 on the installation platform 12.

[0025] like Figure 1 and Figure 2 and Figure 3 and Figure 4A U-shaped connecting plate 24 is vertically slidably connected to the upright plate 21. A sliding plate 22 is installed inside the connecting plate 24. A power source 23 is used to push the connecting plate 24 to move vertically. The buffer mechanism includes a slider 25 vertically slidably connected between the upright plate 21 and the sliding plate 22, and the slider 25 is located in the connecting plate 24. A buffer box 251 is provided on the slider 25. A buffer plate 252 is vertically elastically supported in the buffer box 251 by an elastic component 254. A second connecting groove 122 is provided on the mounting platform 12 for the top of the buffer plate 252 to pass through. The slider 25 is equipped with a connecting mechanism. During the descent of the push plate 221, when the buffer plate 252 buffers the falling fan 13 through the elastic component 254, the connecting mechanism connects the slider 25 to the upright plate 21. After the buffering is completed, the connecting mechanism releases the slider 25 from the upright plate 21 and connects the slider 25 to the slide plate 22, so that the buffer box 251 and the buffer plate 252 descend with the slide plate 22 and disengage from the mounting platform 12 and the fan 13. The elastic component 254 is a compression spring set at the bottom of the buffer box 251.

[0026] like Figure 1 and Figure 2 and Figure 3 and Figure 4 After the power source 23 starts, it drives the connecting plate 24 to descend vertically. The connecting plate 24 drives the slide plate 22 and push plate 221 on its inner side to descend synchronously. The fan 13 also descends. During this descent, the connecting mechanism keeps the slider 25 connected to the vertical plate 21, so that the slider 25, the buffer box 251 and the buffer plate 252 are stationary (e.g., Figure 8 When the bottom surface of the blower 13 contacts the buffer plate 252, the blower 13 will press down on the buffer plate 252 until the blower 13 contacts the mounting platform 12. During this process, the buffer plate 252 compresses the elastic component 254, thereby cushioning the falling blower 13. After the cushioning is completed, the connecting mechanism releases the connection between the slider 25 and the upright plate 21, and then establishes the connection between the slider 25 and the slide plate 22. After that, the slider 25 and the buffer box 251 and buffer plate 252 installed on it become one with the slide plate 22, and continue to descend synchronously with the slide plate 22 until the top of the buffer plate 252 is completely below the mounting platform 12 (e.g., Figure 5 and Figure 6 and Figure 7 This achieves complete physical separation of the entire buffer mechanism from the installation platform 12 and the fan 13, ensuring that subsequent dynamic balance tests are not disturbed. When the top of the buffer plate 252 is completely lowered below the mounting platform 12, the compressed elastic component 254 (compression spring) will automatically return to its natural state.

[0027] like Figure 3 and Figure 4The connecting mechanism includes a slide groove 253 on the side of the slider 25 near the vertical plate 21 and a pressing mechanism on the connecting plate 24. A card plate 2531 is horizontally slidably connected in the slide groove 253. The vertical plate 21 is provided with a first slot 211 that cooperates with the card plate 2531. The slide groove 253 corresponds to the first slot 211. One end of the card plate 2531 is located in the first slot 211. The slide plate 22 is provided with a second slot 222 that cooperates with the card plate 2531. When the slide plate 22 descends, so that the second slot 222 corresponds to the slide groove 253, the pressing mechanism is used to push the card plate 2531 out of the first slot 211 and push one end of the card plate 2531 into the second slot 222. When the slide plate 22 rises, it drives the slider 25 to rise via the clamping plate 2531 until the top of the buffer box 251 contacts the bottom of the mounting platform 12. At this time, the slide groove 253 corresponds to the first clamping groove 211. The slide plate 22 continues to rise. At this time, the opening of the second clamping groove 222 cooperates with the inclined surface 2533 of the clamping plate 2531, pushing one end of the clamping plate 2531 back into the first clamping groove 211. The pressing mechanism includes a horizontal plate 241 set on the connecting plate 24, and the horizontal plate 241 is located on the side of the vertical plate 21 away from the slider 25. A vertical groove 212 is vertically opened on the vertical plate 21, and the vertical groove 212 passes through the first clamping groove 211. The horizontal plate 241 is provided with an insert plate 2411 located in the vertical groove 212. The card plate 2531 has two inclined surfaces. The inclined surface 1 2532 is located in the first card groove 211 and is facing upwards. The inclined surface 2533 is facing downwards. The inclined surface 1 2532 and the inclined surface 2533 are parallel. The bottom end of the insert plate 2411 is provided with a right-angled triangular push plate 2412. When the slide plate 22 descends to the second card groove 222 and corresponds to the slide groove 253, the push plate 2412 and the inclined surface 1 2532 cooperate to push the card plate 2531 out of the first card groove 211 and push one end of the inclined surface 2533 of the card plate 2531 into the second card groove 222.

[0028] like Figure 1 and Figure 3 and Figure 4 The working process of this connecting mechanism is an automatic cycle based on mechanical linkage. When the slide plate 22 is driven to descend, it drives the push plate 221 and the fan 13 to fall. At this time, one end of the clamping plate 2531 is located in the first slot 211 of the upright plate 21, keeping the slider 25 and the buffer mechanism stationary. The fan 13 presses the buffer plate 252 to complete the buffering through the elastic component 254 and places it on the mounting platform 12. When the slide plate 22 descends until its second slot 222 is aligned with the slide groove 253 on the slider 25, the pressing mechanism fixed on the connecting plate 24 moves down synchronously, and its push plate 2412 contacts the upward inclined surface 2532 on the clamping plate 2531 (e.g., Figure 8The inclined plane is used to push the card plate 2531 horizontally out of the first slot 211, and the end of the card plate 2531 with the downward inclined surface 2533 slides into the second slot 222 of the slide plate 22, thereby connecting the slider 25 and the slide plate 22 (e.g.) Figure 7 After that, the slider 25, the buffer box 251 and the buffer plate 252 continue to descend synchronously with the slide plate 22, achieving complete separation from the mounting platform 12. When the buffer plate 252 is completely separated from the mounting platform 12, the push plate 221 is also completely separated from the mounting platform 12. When skateboard 22 rises, as Figure 7 The sliding block 25 and the buffer mechanism rise together via the clamping plate 2531 until the top of the buffer box 251 contacts the bottom surface of the mounting platform 12 and stops (e.g., Figure 2 At this point, the slide groove 253 of the slider 25 is aligned with the first slot 211 of the upright plate 21. Then, the slide plate 22 continues to rise, and the lower edge of its second slot 222 contacts the downward-facing inclined surface 2533 of the plate 2531. Through the action of the inclined surface, the plate 2531 is horizontally pushed out of the second slot 222, thereby allowing one end of the plate 2531 to re-enter the first slot 211, thus reconnecting the slider 25 with the upright plate 21 (as shown). Figure 4 At this point, the top of the buffer plate 252 passes through the second connecting groove 122, the top of the push plate 221 passes through the first connecting groove 121, and the entire mechanism returns to the initial ready state.

[0029] like Figure 3 and Figure 4 The width of the vertical groove 212 is smaller than the width of the card plate 2531. The card plate 2531 can only enter the first card groove 211 and the second card groove 222, but cannot enter the vertical groove 212.

[0030] like Figure 8 When the slide plate 22 descends, causing the push plate 2412 to contact the first inclined surface 2532, the tip of the second inclined surface 2533 corresponds to the second slot 222. At this time, by having the tip of the second inclined surface 2533 correspond to the second slot 222, the interference, rigid collision and friction between the card plate 2531 and the slide plate 22 during the pushing process of the card plate 2531 are reduced, which could lead to jamming.

[0031] like Figure 1 The top surface of the buffer plate 252 is covered with a rubber layer (not shown in the figure), which reduces the hard scraping or bumping between the bottom of the fan 13 and the buffer plate 252.

[0032] like Figure 9The bottom edges of the first connecting groove 121 and the second connecting groove 122 are both chamfered edges 14. By setting the chamfered edges 14, the tops of the buffer plate 252 and the push plate 221 can be guided and pass through the second connecting groove 122 and the first connecting groove 121 respectively, reducing the risk of jamming.

[0033] The working process of this device is as follows: Step 1: Initial material loading and fine-tuning of planar position The operator hoists the fan 13 to be tested onto the ball bearings 2211 of the push plates 221 on both sides. The fan 13 is supported by the ball bearings 2211. Since the bottom surface of the fan 13 is supported by multiple freely rolling ball bearings 2211, the operator can easily push the fan 13 to adjust its planar position above the mounting platform 12. During this process, the fan 13 does not have direct contact with the surface of the mounting platform 12, which reduces wear.

[0034] Step 2: Place the buffer After the position of the fan 13 is adjusted, the connecting plate 24, the sliding plate 22 and the push plate 221 are slowly lowered by the power source 23. At this time, since the slider 25 is connected to the upright plate 21 through the clamping plate 2531, it remains stationary. The push plate 221 descends and drives the fan 13 to fall synchronously. The bottom surface of the fan 13 first contacts the buffer plate 252 and gradually compresses the elastic component 254 below it until the fan 13 contacts the installation platform 12. During this process, the buffer plate 252 and the elastic component 254 can buffer the fan 13.

[0035] Step 3: Connecting and Disconnecting As the slide plate 22 descends with the connecting plate 24 to a specific position, the pushing component fixed on the connecting plate 24 (its bottom pushing plate 2412) contacts the upward-facing inclined surface 2532 on the locking plate 2531. At this time, the tip of the second inclined surface 2533 on the locking plate 2531 corresponds to the second locking groove 222 on the slide plate 22. Then, the connecting plate 24 continues to descend, and using the inclined surface, the pushing plate 2412 pushes the locking plate 2531 horizontally out of the first locking groove 211 and pushes the end with the downward-facing inclined surface 2533 into the second locking groove 222 of the slide plate 22. In step 2, until the card plate 2531 separates from the first card slot 211, the connection between the slider 25 and the slide plate 22 is established. The power source 23 continues to drive the connecting plate 24 and the slide plate 22 to descend. The slider 25, the buffer box 251 and the buffer plate 252 then descend together as a whole until the top of the buffer plate 252 is completely below the mounting platform 12. At this time, the fan 13 is completely supported by the mounting platform 12. The mounting platform 12 does not contact the buffer mechanism and the push plate 221, and will not have any additional impact on the subsequent high-precision vibration test.

[0036] Step 4: Final Fixing and Testing Securely fasten the fan 13, which is already in place, to the mounting platform 12 using bolts and other clamps. Then, start the fan 13 and perform a whole-machine balancing test.

[0037] Step 5: Reset (after testing) After the test is completed and the fan 13 is disassembled, the power source 23 drives the connecting plate 24, the slide plate 22, etc. to rise. The slide plate 22 drives the slider 25 and the buffer mechanism to rise together through the clamping plate 2531. When the top of the buffer box 251 contacts the bottom surface of the mounting platform 12, the slider 25 stops rising. At this time, the slide groove 253 of the slider 25 is re-aligned with the first clamping groove 211 of the upright plate 21. The slide plate 22 continues to rise, and the lower edge of its second clamping groove 222 contacts the downward inclined surface 2533 of the clamping plate 2531. Using the action of this inclined surface, the clamping plate 2531 is horizontally pushed back into the first clamping groove 211 from the second clamping groove 222. The device returns to the first step state and waits for the next working cycle.

[0038] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A device for testing the dynamic balance of a subway air conditioning fan, comprising a base (1) and two vibration test supports (11) mounted on the base (1), wherein the top ends of the two vibration test supports (11) are jointly mounted with an installation platform (12) for placing a fan (13), characterized in that, Two opposing pushing mechanisms are provided between the installation platform (12) and the base (1), and push plates (221) are connected to the two pushing mechanisms respectively. The installation platform (12) is provided with a first connecting groove (121) through which the top of the corresponding push plate (221) passes vertically. The top of the push plate (221) is provided with a number of ball bearings (2211) for temporarily supporting the fan (13). The pushing mechanism is equipped with a buffer mechanism. When the pushing mechanism drives the push plate (221) to descend, the buffer mechanism first buffers the falling fan (13), and then descends with the pushing mechanism until it disengages from the installation platform (12) and the fan (13).

2. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 1, characterized in that, The pushing mechanism includes an inverted U-shaped fixed frame (2), the base (1) is located inside the fixed frame (2) and does not contact the fixed frame (2), the fixed frame (2) is provided with a vertical plate (21), and a sliding plate (22) is vertically connected to the vertical plate (21). The push plate (221) is set at the top of the sliding plate (22), and the fixed frame (2) is provided with a power source (23) for pushing the sliding plate (22) to move vertically.

3. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 2, characterized in that, A U-shaped connecting plate (24) is vertically slidably connected to the upright plate (21). The sliding plate (22) is installed on the inner side of the connecting plate (24). The power source (23) is used to push the connecting plate (24) to move vertically. The buffer mechanism includes a slider (25) vertically slidably connected between the upright plate (21) and the sliding plate (22), and the slider (25) is located in the connecting plate (24). A buffer box (251) is provided on the slider (25). A buffer plate (252) is vertically elastically supported in the buffer box (251) by an elastic component (254). The mounting platform (12) has an opening for the buffer. The second connecting groove (122) passes through the top of the plate (252). The slider (25) is provided with a connecting mechanism. During the descent of the push plate (221), when the buffer plate (252) buffers the falling fan (13) through the elastic component (254), the connecting mechanism connects the slider (25) with the upright plate (21). After the buffering is completed, the connecting mechanism releases the connection between the slider (25) and the upright plate (21) and connects the slider (25) with the slide plate (22) so that the buffer box (251) and the buffer plate (252) descend with the slide plate (22) and disengage from the installation platform (12) and the fan (13).

4. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 3, characterized in that, The connecting mechanism includes a slide groove (253) on the side of the slider (25) near the upright plate (21) and a pressing mechanism on the connecting plate (24). A card plate (2531) is horizontally slidably connected in the slide groove (253). The upright plate (21) is provided with a first slot (211) that cooperates with the card plate (2531). The slide groove (253) corresponds to the first slot (211). One end of the card plate (2531) is located in the first slot (211). The slide plate (22) is provided with a second slot (222) that cooperates with the card plate (2531). When the slide plate (22) descends, so that the second slot (222) corresponds to the slide groove (253), the pressing mechanism is used to push the card plate (2531) out of the first slot (211) and push one end of the card plate (2531) into the second slot (222). When the slide plate (22) rises, the slide plate (22) drives the slider (25) to rise through the plate (2531) until the top of the buffer box (251) contacts the bottom of the mounting platform (12). At this time, the slide groove (253) corresponds to the first slot (211), and the slide plate (22) continues to rise. At this time, the slot of the second slot (222) cooperates with the inclined surface (2533) of the plate (2531) to push one end of the plate (2531) back into the first slot (211).

5. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 4, characterized in that, The extrusion mechanism includes a horizontal plate (241) disposed on the connecting plate (24), and the horizontal plate (241) is located on the side of the vertical plate (21) away from the slider (25). A vertical groove (212) is vertically opened on the vertical plate (21), and the vertical groove (212) passes through the first slot (211). An insert plate (2411) is provided on the horizontal plate (241) located in the vertical groove (212). The slot plate (2531) has two inclined surfaces, and the inclined surface one (2532) is located in the first slot (211) and facing upward. The downward-facing slope is the second slope (2533), and the first slope (2532) is parallel to the second slope (2533). The bottom end of the insert plate (2411) is provided with a right-angled triangular push plate (2412). When the slide plate (22) descends to the second slot (222) and the slide groove (253), the push plate (2412) and the first slope (2532) cooperate to push the plate (2531) out of the first slot (211) and push one end of the second slope (2533) of the plate (2531) into the second slot (222).

6. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 5, characterized in that, When the slide plate (22) descends, causing the push plate (2412) to contact the first inclined plane (2532), the tip of the second inclined plane (2533) corresponds to the second slot (222).

7. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 3, characterized in that, The elastic component (254) is a compression spring disposed at the bottom of the buffer box (251).

8. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 3, characterized in that, The top surface of the buffer plate (252) is covered with a rubber layer.

9. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 1, characterized in that, The top of the push plate (221) has a groove (2212) that is adapted to the ball (2211). The ball (2211) is partially embedded in the groove (2212) at the top of the push plate (221), and the top of the ball (2211) protrudes from the upper surface of the push plate (221).

10. The device for testing the dynamic balance of a subway air conditioning fan as described in claim 3, characterized in that, The bottom edges of the first connecting groove (121) and the second connecting groove (122) are both chamfered edges (14).

Images