CN112393871A - Through-flow fan blade drop test tool - Google Patents
Through-flow fan blade drop test tool Download PDFInfo
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- CN112393871A CN112393871A CN202011337490.6A CN202011337490A CN112393871A CN 112393871 A CN112393871 A CN 112393871A CN 202011337490 A CN202011337490 A CN 202011337490A CN 112393871 A CN112393871 A CN 112393871A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a through-flow fan blade drop test tool, which comprises: a support; the supporting component comprises a baffle and a supporting plate which are overlapped from top to bottom, the baffle is fixedly connected with the bracket, and one end of the supporting plate is provided with a strip-shaped notch; the power assembly is fixed on the bracket and is provided with a movable part, and the movable part is connected with the supporting plate and can drive the supporting plate to translate along the length direction of the notch; when the cross-flow fan blade is placed on the supporting plate, the edge of the baffle is in contact with the outer circumferential surface of the cross-flow fan blade. Based on the technical scheme of the invention, the supporting of the supporting plate and the automatic separation of the supporting plate and the tested wind blade are realized by utilizing the matching of the supporting component and the power component, the manual labor is reduced, the verticality of the tested wind blade in falling is ensured, and the testing efficiency and accuracy are greatly improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a through-flow fan blade drop test tool.
Background
The cross-flow fan blade is an important part of an air conditioner, and the firmness of the connection of the steel shaft and the end cover directly determines whether the fan blade can keep the structural integrity in the transportation process of the air conditioner and can be normally used in the long-term use process. In order to test the strength of the connecting part of the steel shaft and the end cover, a vertical drop test can be carried out in the production process of the through-flow fan blade, and the method for the vertical drop test of the steel shaft of the through-flow fan blade comprises the following steps:
firstly, fixing the shaft sleeve end of the cross-flow fan blade, enabling the axis direction of the fan blade to be vertical to the ground, enabling the steel shaft end to be downward, and lifting the fan blade to the height H from the tail end of the steel shaft to the ground; and then loosening the cross-flow fan blade to enable the cross-flow fan blade to freely fall onto a horizontal cement floor (when the weight of the cross-flow fan blade is less than or equal to 700g, H is 300mm, the weight of the cross-flow fan blade is more than 700g, and H is 250 mm). After the vertical drop test, the end cover of the cross-flow fan blade has no cracks or damages, the steel shaft has no looseness, the surface of the blade has no cracks, damages and deformation, and the balance sheet does not drop.
The existing testing method needs manual operation, during testing, a tester lifts the fan blade by hands and lifts the fan blade to a specific height, the height required by the testing is the height between the steel shaft and the ground, and the height is lower. Because the height required by the test is lower, and the fan blade is generally longer, when a single person tests, a tester cannot directly observe the height between the steel shaft and the ground, so that the height of the steel shaft of the fan blade from the ground is difficult to accurately control, the test accuracy is greatly influenced, and two persons are generally needed to assist in completing the test, which is inconvenient. And the verticality of the fan blade and the ground is difficult to control by manually holding the fan blade, and the test accuracy is also influenced.
Disclosure of Invention
To the problem among the above-mentioned prior art, this application has provided a through-flow fan blade drop test frock, utilizes the cooperation of bearing subassembly and power component, realizes the support of tray and with the autosegregation of being surveyed the wind leaf, reduces artifical work and guarantees the verticality when being surveyed the wind leaf and fall, has greatly improved the efficiency and the accuracy of test.
The invention relates to a through-flow fan blade drop test tool, which comprises:
a support;
the supporting component comprises a baffle and a supporting plate which are overlapped from top to bottom, the baffle is fixedly connected with the bracket, one end of the supporting plate is provided with a strip-shaped notch, and the end part of the supporting plate where the notch is located is U-shaped;
the power assembly is fixed on the bracket and is provided with a movable part, and the movable part is connected with the supporting plate and can drive the supporting plate to translate along the length direction of the notch;
when the cross-flow fan blade is placed on the supporting plate, the steel shaft of the cross-flow fan blade is positioned in the notch, and the edge of the baffle plate is in contact with the outer circumferential surface of the cross-flow fan blade.
In one embodiment, the test tool is provided with a first supporting component and a second supporting component, the first supporting component and the second supporting component are respectively arranged above and below the power component and staggered with each other, and the heights of two of the supporting plates respectively correspond to two test heights. Through this embodiment, the height of two layer boards in first bearing subassembly and the second bearing subassembly corresponds two kinds of test height respectively, and then can satisfy the test demand of two kinds of test height respectively, makes this test fixture can be applicable to the drop test of the through-flow fan blade of different weights.
In one embodiment, the axes of the projections of the two supporting plates in the first supporting assembly and the second supporting assembly on the horizontal plane are located on the same straight line, and the notches of the two supporting plates are located at one end far away from each other and at the other end close to each other;
wherein, the one end that two layer boards are close to each other all connects the movable part.
Through this embodiment, two layer boards in first bearing subassembly and the second bearing subassembly are connected simultaneously to the movable part in the same power component, and then can drive two layer boards through single power, and then simplified test fixture's structure.
In one embodiment, the movable portion is fixedly connected with a vertical connecting plate, and the top and the bottom of the connecting plate are respectively connected with one ends of the two supporting plates of the first supporting component and the second supporting component, which are close to each other. Through this embodiment, two layer boards in first bearing subassembly and the second bearing subassembly pass through the connecting plate and are connected as an organic wholely with the movable part, and two layer boards are the Z shape structure with the connecting plate is whole, and the single power of the full realization utilizes the technological effect of two layer boards of drive.
In one embodiment, the two support plates in the first and second support members are each closely adjacent to the corresponding baffle. Through the embodiment, as the two supporting plates and the connecting plate are integrally in a Z-shaped structure, when the tested wind blade is placed on one supporting plate, the supporting plate has a sinking trend due to the gravity of the tested wind blade, and the other supporting plate has an upward tilting trend; the supporting plate is tightly attached to the baffle plate, so that the baffle plate can prevent the supporting plate from upwarping, and the supporting plate for placing the tested wind blade can not sink; therefore, the technical effect of keeping the structure of the testing tool stable is achieved.
In one embodiment, a first rib and a second rib extend outwards from the edge of the baffle plate close to the notch, and the baffle plate, the first rib and the second rib are Y-shaped as a whole;
when the cross-flow fan blade is placed on the supporting plate, the first retaining edge and the second retaining edge are both in contact with the outer circumferential surface of the cross-flow fan blade.
Through the embodiment, the first retaining edge and the second retaining edge are positioned on two sides of the contact position of the baffle and the cross-flow fan blade, contact points with the cross-flow fan blade are added on the two sides, the cross-flow fan blade is ensured not to move towards the two sides in the horizontal direction, and the influence of the horizontal movement of the cross-flow fan blade on the accuracy of the test is avoided.
In one embodiment, the power assembly is a cylinder, the movable part is a telescopic end of the cylinder, and the telescopic end of the cylinder is fixedly connected with one end, far away from the gap, of the supporting plate. Through this embodiment, regard the cylinder as power component, the structure and the functional stability of cylinder, reliable to the controllability of cylinder is good, the control of the testing personnel of being convenient for.
In one embodiment, the cylinder is connected with a solenoid valve, and the solenoid valve is provided with a button for controlling the solenoid valve. Through this embodiment, control the action of cylinder through the solenoid valve, control simple structure, simple operation, the control of the tester of being convenient for.
In one embodiment, the support comprises two vertical pillars and a cross beam arranged on the tops of the two pillars, and the supporting component and the power component are arranged below the cross beam.
In one embodiment, a horizontal mounting plate is secured to a lower surface of the cross beam, and the power module is secured to a lower surface of the mounting plate.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
Compared with the prior art, the through-flow fan blade drop test tool provided by the invention at least has the following beneficial effects:
according to the through-flow fan blade drop test tool, the tested fan blade is placed by the supporting assembly consisting of the supporting plate and the baffle, the supporting plate of the supporting assembly has a certain height and is matched with the height required by the test, the fan blade does not need to be lifted and kept at the specific height manually, other personnel are not needed for assistance, the labor intensity of the personnel is reduced, the waste of manpower resources is reduced, and the convenience in operation is improved. Meanwhile, the power assembly drives the supporting plate to move, so that the tested wind blade is separated from the supporting plate and falls freely for drop test, the time consumption is short, the operation is simple and convenient, the verticality of the tested wind blade in the drop process can be ensured, and the test efficiency and accuracy are greatly improved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 shows a perspective view of the test apparatus of the present invention;
FIG. 2 shows an exploded view of the structure shown in FIG. 1;
FIG. 3 shows a partial enlarged view at A in FIG. 2;
FIG. 4 shows a front view of the structure shown in FIG. 1;
FIG. 5 shows a top view of the structure shown in FIG. 1;
figure 6 shows a schematic view of the testing device of the present invention in use.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Reference numerals:
10-bracket, 11-pillar, 12-beam, 13-mounting plate, 20-supporting component, 201-first supporting component, 202-second supporting component, 21-baffle, 211-first rib, 212-second rib, 22-supporting plate, 221-notch, 30-power component, 31-movable part, 32-connecting plate, 33-electromagnetic valve, 331-button and 40-tested wind blade.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention provides a through-flow fan blade drop test tool, which comprises:
a support 10;
the supporting component 20 comprises a baffle plate 21 and a supporting plate 22 which are overlapped from top to bottom, the baffle plate 21 is fixedly connected with the support 10, one end of the supporting plate 22 is provided with a strip-shaped notch 221, and the end part of the supporting plate 22 where the notch 221 is located is U-shaped;
the power assembly 30 is fixed on the support 10, the power assembly 30 is provided with a movable part 31, and the movable part 31 is connected with the supporting plate 22 and can drive the supporting plate 22 to translate along the length direction of the notch 221;
when the cross-flow fan blade is placed on the supporting plate 22, the steel shaft of the cross-flow fan blade is positioned in the notch 221, and the edge of the baffle plate 21 is in contact with the outer circumferential surface of the cross-flow fan blade.
Specifically, as shown in the drawings, the test fixture of the present invention mainly includes a support 10, and a supporting component 20 and a power component 30 which are arranged on the support 10, wherein the supporting component 20 is used for placing a tested wind blade 40; the supporting member 20 has a fixed set height, and more specifically, the distance between the upper surface of the supporting plate 22 in the supporting member 20 and the ground is equal to the test height required for the test. The distances from the tail ends of the steel shafts of the fan blades of different models to the end covers are consistent, and only the blade structures, the diameters, the lengths, the weights and the node numbers are different, so that the height from the tail ends of the steel shafts to the ground can be controlled by controlling the height of the end covers, and the tested fan blades 40 are dragged by the supporting plates 22 with fixed heights, so that the height of the tested fan blades 40 meets the height required by the test.
When the tested wind blade 40 is placed on the supporting plate 22, the end cover thereof is stably contacted with the upper surface of the supporting plate 22, the steel shaft thereof is accommodated in the notch 221, at the moment, the tested wind blade 40 is kept still at the testing height in a posture that the axis is vertical to the ground, and the edge of the baffle plate 21 is contacted with the circumferential outer surface of the tested wind blade 40. Then, the power assembly 30 is controlled to operate, the movable portion 31 in the power assembly 30 moves and drives the U-shaped end portion of the supporting plate 22 to horizontally move towards one side of the baffle plate 21, the tested wind blade 40 cannot move along with the supporting plate 22 due to the blocking of the baffle plate 21, the lower end of the tested wind blade 40 cannot be inclined towards the moving direction of the supporting plate due to inertia, and the tested wind blade 40 is kept still and moves relative to the supporting plate 22. When the supporting plate 22 moves to be separated from the tested wind blade 40, the steel shaft of the tested wind blade 40 relatively moves out of the notch 221, the end cover is separated from the supporting plate 22, the tested wind blade 40 loses the support of the supporting plate 22 and falls vertically, the tail end of the steel shaft collides with the ground, and at the moment, the U-shaped end part of the supporting plate 22 completely moves to the position below the baffle plate 21. And checking whether the end cover of the tested fan blade 40 has cracks or damages, whether the steel shaft is loosened, whether the surface of the fan blade has cracks, damages and deformation, and whether the balance sheet falls off, and obtaining the test result of the tested fan blade 40 according to the check result.
Note that, before the test, it is checked whether the U-shaped end of the pallet 22 is in an extended state or retracted state below the flap 21; if the U-shaped end of the supporting plate 22 is retracted below the baffle 21, the tested wind blade 40 cannot be placed on the supporting plate 22, and the power assembly 30 needs to be controlled to operate once to extend the U-shaped end of the supporting plate 22.
Further, when the U-shaped end of the pallet 22 is extended, the notch 221 still extends to the area under the flap 21 covered by the flap 21. As shown in figure 5 of the accompanying drawings.
In one embodiment, the testing tool has a first supporting member 201 and a second supporting member 202, the first supporting member 201 and the second supporting member 202 are respectively disposed above and below the power assembly 30 and are staggered with each other, and the heights of the two supporting plates 22 of the two supporting members respectively correspond to two testing heights.
Specifically, the heights of the two supporting plates 22 in the first supporting assembly 201 and the second supporting assembly 202 respectively correspond to two test heights, so that the test requirements of the two test heights can be met; in the embodiment, when the weight of the cross-flow fan blade is less than or equal to 700g, the test height is 300 mm; the weight of the cross-flow fan blade is larger than 700g, the test height is 250mm, and the test tool can be suitable for drop tests of cross-flow fan blades with different weights.
In one embodiment, the axes of the projections of the two support plates 22 in the first holding member 201 and the second holding member 202 on the horizontal plane are located on the same straight line, and the notches 221 of the two support plates 22 are located at one end far away from each other and at the other end close to each other;
wherein, the movable part 31 is connected to one end of the two support plates 22 close to each other.
Specifically, the movable portion 31 of the same power assembly 30 is connected to the two support plates 22 of the first support assembly 201 and the second support assembly 202 at the same time, so that the two support plates 22 can be driven by a single power, thereby simplifying the structure of the test fixture. In this embodiment, at the same time, the states of the two support plates 22 are different, that is, one support plate 22 is in a state of being retracted below the baffle 21, and the other support plate 22 is in a state of being extended; and then the tested wind blades 40 corresponding to the first holding component 201 and the second holding component 202 are tested alternately.
In one embodiment, the movable portion 31 is fixedly connected to a vertical connecting plate 32, and the top and bottom of the connecting plate 32 are respectively connected to the ends of the two support plates 22 of the first supporting member 201 and the second supporting member 202 close to each other.
Specifically, as shown in fig. 4, the two supporting plates 22 in the first supporting member 201 and the second supporting member 202 are connected to the movable portion 31 through the connecting plate 32, and the two supporting plates 22 and the connecting plate 32 are integrally in a Z-shaped structure, so that the technical effect of driving the two supporting plates 22 by using a single power is fully achieved.
In one embodiment, both of the support plates 22 in the first and second support members 201, 202 abut the corresponding baffle 21.
Specifically, since the two support plates 22 are integrally formed with the connection plate 32 in a Z-shaped configuration, the two support plates 22 are integrally formed with the connection plate 32 in a lever configuration having a fulcrum at the movable portion 31. When a tested fan blade 40 is placed on one supporting plate 22, the supporting plate 22 has a sinking trend due to the gravity of the tested fan blade 40, and the other supporting plate 22 has an upward tilting trend due to the lever principle; because the supporting plate 22 is tightly attached to the baffle plate 21, the baffle plate 21 can prevent the supporting plate 22 from upwarping, and the supporting plate 22 on which the tested wind blade 40 is placed can not sink; therefore, the technical effect of keeping the structure of the testing tool stable is achieved.
In one embodiment, a first rib 211 and a second rib 212 extend outwards from the edge of the baffle plate 21 close to the notch 221, and the baffle plate 21, the first rib 211 and the second rib 212 are Y-shaped as a whole;
when the cross-flow fan blade is placed on the supporting plate 22, the first rib 211 and the second rib 212 are both in contact with the outer circumferential surface of the cross-flow fan blade.
Specifically, the first retaining edge 211 and the second retaining edge 212 are located on two sides of a contact position of the baffle 21 and the cross-flow fan blade, contact points with the cross-flow fan blade are added on the two sides, it is ensured that the cross-flow fan blade does not move towards the two sides in the horizontal direction, and the influence of the horizontal movement of the cross-flow fan blade on the accuracy of the test is avoided. In addition, the baffle 21, the first rib 211 and the second rib 212 are Y-shaped as a whole, so that the bearing assembly 2 can be further applied to the blades to be measured with different diameters within a certain range.
In one embodiment, the power assembly 30 is a cylinder, and the movable portion 31 is a telescopic end of the cylinder, and the telescopic end of the cylinder is fixedly connected to an end of the supporting plate 22 far from the notch 221.
Specifically, the power assembly 30 may also adopt other power devices as long as it can drive the supporting plate 22 to move horizontally, for example, a hydraulic cylinder, an electric push rod, or other power devices may be adopted.
Preferably, the cylinder is connected with a solenoid valve 33, and a button 331 for controlling the solenoid valve 33 is provided on the solenoid valve 33.
Specifically, the tester controls the electromagnetic valve 33 by pressing the button 331, thereby controlling the cylinder to drive the supporting plate 22 to move. The two times of pressing the button 331 are different in the direction of the cylinder, that is, if the button 331 is pressed once and the cylinder extends out, the button 331 is pressed next time and the cylinder retracts back. The distance of one-time extending or retracting of the telescopic end of the cylinder is set in advance or the cylinder with corresponding specification is adopted.
In one embodiment, the support frame 10 includes two vertical pillars 11 and a beam 12 disposed on top of the two pillars 11, and the supporting member 20 and the power member 30 are disposed below the beam 12.
A horizontal mounting plate 13 is fixed to the lower surface of the cross beam 12, and a power unit 30 is fixed to the lower surface of the mounting plate 13.
Specifically, as shown in fig. 4, the lower surface of the mounting plate 13 is connected to the power assembly 30, the baffle plate 21 of the second supporting assembly is fixedly connected to the lower surface of the power assembly 30, the supporting plate 22 of the second supporting assembly is located below the baffle plate 21, and one end of the supporting plate 22 is connected to the bottom of the connecting plate 32 of the movable portion 31 of the power assembly 30; the baffle plate 21 of the first supporting member is attached to the upper surface of one side of the mounting plate 13, and the supporting plate 22 of the first supporting member is located below the baffle plate 21 and has one end attached to the top of the connecting plate 32 of the movable portion 31 of the power unit 30.
The process of the through-flow fan blade vertical drop test corresponding to the test tool comprises the following steps:
1. and selecting the U-shaped supporting plate 22 with the corresponding height according to the weight of the fan blade.
2. Whether the corresponding pallet 22 is in the extended or retracted state is checked, and if the pallet 22 is in the retracted state, the button 331 is pressed to extend the pallet 22.
3. The tested wind blade 40 is placed on the U-shaped end part of the supporting plate 22 according to the downward direction of the steel shaft, the steel shaft penetrates through the notch 221 on the supporting plate 22, and the circumferential surface of the tested wind blade 40 is in contact with the edge of the baffle plate 21 and two flanges on the baffle plate 21.
4. The button 331 is pressed, the electromagnetic valve 33 controls the cylinder to drive the supporting plate 22 to retract, and the tested wind blade 40 freely falls to the ground after losing the support of the supporting plate 22 on the bottom of the tested wind blade, so that the test is completed.
5. Checking whether the end cover of the tested wind blade 40 has cracks or damages, whether the steel shaft is loosened, whether the surface of the blade has cracks, damages and deformation, and whether the balance sheet falls off.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. The utility model provides a through-flow fan blade drop test frock which characterized in that includes:
a support;
the supporting component comprises a baffle and a supporting plate which are overlapped from top to bottom, the baffle is fixedly connected with the bracket, one end of the supporting plate is provided with a strip-shaped notch, and the end part of the supporting plate where the notch is located is U-shaped;
the power assembly is fixed on the bracket and is provided with a movable part, and the movable part is connected with the supporting plate and can drive the supporting plate to translate along the length direction of the notch;
when the cross-flow fan blade is placed on the supporting plate, the steel shaft of the cross-flow fan blade is positioned in the notch, and the edge of the baffle plate is in contact with the outer circumferential surface of the cross-flow fan blade.
2. The through-flow fan blade drop test tool according to claim 1, wherein the test tool comprises a first support assembly and a second support assembly, the first support assembly and the second support assembly are respectively arranged above and below the power assembly and are staggered with each other, and the heights of two support plates in the first support assembly and the second support assembly respectively correspond to two test heights.
3. The cross-flow fan blade drop test tool according to claim 2, wherein the axes of the projections of the two support plates in the first support assembly and the second support assembly on the horizontal plane are located on the same straight line, and one ends of the two support plates where the notches are located are far away from each other, and the other ends of the two support plates are close to each other;
wherein, the one end that two layer boards are close to each other all connects the movable part.
4. The cross-flow fan blade drop test tool according to claim 3, wherein the movable portion is fixedly connected with a vertical connecting plate, and the top and the bottom of the connecting plate are respectively connected with one end of the first supporting assembly, which is close to one end of the second supporting assembly, which is close to the other end of the first supporting assembly.
5. The through-flow fan blade drop test tool according to claim 4, wherein the two support plates in the first support assembly and the second support assembly are tightly attached to the corresponding baffle.
6. The through-flow fan blade drop test tool according to any one of claims 1 to 5, wherein a first rib and a second rib extend outwards from the edge of the baffle plate close to the notch, and the baffle plate, the first rib and the second rib are Y-shaped as a whole;
when the cross-flow fan blade is placed on the supporting plate, the first retaining edge and the second retaining edge are both in contact with the outer circumferential surface of the cross-flow fan blade.
7. The through-flow fan blade drop test tool according to claim 1, wherein the power assembly is a cylinder, the movable portion is a telescopic end of the cylinder, and the telescopic end of the cylinder is fixedly connected with one end, far away from the gap, of the supporting plate.
8. The through-flow fan blade drop test tool according to claim 7, wherein the cylinder is connected with an electromagnetic valve, and the electromagnetic valve is provided with a button for controlling the electromagnetic valve.
9. The cross-flow fan blade drop test tool according to claim 1, wherein the support comprises two vertical pillars and a cross beam arranged at the tops of the two pillars, and the supporting assembly and the power assembly are both arranged below the cross beam.
10. The cross-flow fan blade drop test tool according to claim 9, wherein a horizontal mounting plate is fixed to the lower surface of the cross beam, and the power assembly is fixed to the lower surface of the mounting plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011337490.6A CN112393871A (en) | 2020-11-25 | 2020-11-25 | Through-flow fan blade drop test tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011337490.6A CN112393871A (en) | 2020-11-25 | 2020-11-25 | Through-flow fan blade drop test tool |
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| CN112393871A true CN112393871A (en) | 2021-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405756A (en) * | 2021-06-15 | 2021-09-17 | 安徽朗迪叶轮机械有限公司 | Height-adjustable cross-flow fan blade drop test tool |
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| CN110726524A (en) * | 2019-11-21 | 2020-01-24 | 格力电器（武汉）有限公司 | Drop test bench with high test efficiency |
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