CN211668737U - Drop test device - Google Patents

Abstract

The utility model relates to a drop test device field, in particular to drop test device, including examining test table, barrel, striking piece, negative pressure unit and the control unit, examine test table and be used for placing the examination article that awaits measuring, the barrel sets up directly over the examination article that awaits measuring, the striking piece sets up in the barrel and can prolong the barrel and reciprocate, the negative pressure unit provides the negative pressure for the barrel inner chamber that strikes piece top, the start-up and the stop of the control unit control negative pressure unit. Through setting up barrel and striking piece, just can let the striking piece drop the test to the article that awaits measuring along the barrel to once fall the striking back, can continue to inhale the piece that strikes through the negative pressure unit, just so can realize used repeatedly, and can also avoid the secondary to fall the inaccurate phenomenon of test result that causes, this device simple structure, with low costs, it is very reliable to use.

Description

Drop test device

Technical Field

The utility model relates to a drop test device field, in particular to drop test device.

Background

In recent years, with the continuous development of communication technology and the continuous advancement of science and technology, terminals such as mobile phones, notebook computers, tablet computers and the like have become essential use tools in daily life of people; the terminal is convenient to carry and simple to use, and brings great convenience to life of people. The existing terminal screen is subjected to a steel ball drop test before being delivered to a client so as to verify whether the hardness, rigidity, flexibility and the like of the terminal screen can meet requirements.

In order to carry out a drop test, the invention patent of a steel ball drop test device of a terminal screen (application number: 201810833790.X) filed by Shanghai and De communication technology Limited in 2018, 07, 26 discloses a steel ball drop test device of a terminal screen, which comprises a steel ball dispenser mechanism and a clamping mechanism for clamping a piece to be tested; the steel ball delivery mechanism comprises a base and a steel ball adsorption component; the steel ball adsorption component is fixed on the base; and the clamping mechanism is positioned right below the steel ball adsorption component. When in test, the piece to be tested is clamped on the clamping mechanism, and the clamping mechanism is positioned under the steel ball adsorption component, so that the adsorbed steel ball can be directly released by the steel ball adsorption component to hit the screen of the piece to be tested, and the subsequent pressure resistance test of the screen of the piece to be tested can be carried out. The test device has a plurality of problems: firstly, the steel ball is bounced after being hit on the piece to be tested after being released, and can be hit on the piece to be tested again, so that the test result is inaccurate; secondly, the recovery of the steel balls is very troublesome, and a plurality of complex structures need to be additionally arranged; thirdly, when tests with different heights and weights are required, the adjustment is very troublesome.

Disclosure of Invention

An object of the utility model is to provide a drop test device can use repeatedly and can avoid the secondary to fall.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a drop test device, is including examining test table, barrel, striking piece, negative pressure unit and the control unit, examine test table and be used for placing the examination article of awaiting measuring, the barrel sets up directly over the examination article of awaiting measuring, the striking piece sets up and can be followed the extension barrel and reciprocate in the barrel, the negative pressure unit provides the negative pressure for the barrel inner chamber of striking piece top, the control unit control negative pressure unit's start-up and stop.

Compared with the prior art, the utility model discloses there are following technological effect: through setting up barrel and striking piece, just can let the striking piece drop the test to the article that awaits measuring along the barrel to once fall the striking back, can continue to inhale the piece that strikes through the negative pressure unit, just so can realize used repeatedly, and can also avoid the secondary to fall the inaccurate phenomenon of test result that causes, this device simple structure, with low costs, it is very reliable to use.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective view of the support in northern winds;

FIG. 3 is a perspective view of the stop block and the impact block;

FIG. 4 is a schematic structural view of an impact block;

fig. 5 is a schematic circuit diagram of a first embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a second embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a third embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to fig. 1 to 7.

Referring to fig. 1-7, a drop test device includes a test table 10, a cylinder 20, an impact block 40, a negative pressure unit 50, and a control unit 60, where the test table 10 is used to place an object to be tested, the cylinder 20 is disposed over the object to be tested, the impact block 40 is located in the cylinder 20 and can move up and down along the cylinder 20, the negative pressure unit 50 provides negative pressure for an inner cavity of the cylinder 20 above the impact block 40, and the control unit 60 controls the start and stop of the negative pressure unit 50. Through the arrangement of the barrel 20 and the impact block 30, the impact block 30 can perform a drop test on a to-be-tested object along the barrel 20, and when the device is used, only the negative pressure unit 50 needs to be stopped, so that the impact block 40 cannot be subjected to the suction effect of negative pressure on the barrel 20, and the impact block 40 falls down along the barrel 20 under the action of the gravity of the impact block 40; and after the impact is fallen once, the impact block 40 can be sucked up through the negative pressure unit 50, so that the repeated use can be realized, and the phenomenon of inaccurate test result caused by secondary falling can also be avoided.

Since many times drop tests of various heights are required, we can certainly achieve this by using cartridges 20 of different lengths, but this can be cumbersome. In the utility model, preferably, the cylinder 20 is internally provided with the stop 30, and the height of the stop 30 in the cylinder 20 is adjustable; the striking block 40 is positioned in the cylinder body 20 below the stop block 30, the striking block 40 moves upwards and abuts against the stop block 30 when the negative pressure unit 50 is started, and the striking block 40 falls on the object to be tested under the action of gravity when the negative pressure unit 50 is stopped. After the stopper 30 is provided, the height of the stopper 30 is first adjusted according to the drop test height required, and then the test can be performed. At the time of testing, due to the arrangement of the stopper 30, the striking block 40 is stopped from moving upward up to the position of the stopper 30, and then the striking block 40 falls from this height at the time of testing. The length of the cartridge 20 can be set longer, typically higher than the maximum drop test height.

The shapes of the cylinder 20 and the striking block 40 are various, and the cylinder 20 having a cross section of various shapes such as a square, an oval, a circle, etc. may be selected as long as the cross section of the striking block 40 is consistent therewith. However, the circular cross-section of the barrel 20 and the spherical striking block 40 are relatively simpler in structure, easier to machine, and more effective in dropping. Therefore, in the present invention, preferably, the cross section of the cylinder 20 is circular, the impact block 40 is a sphere, and the impact block 40 and the cylinder 20 form a clearance fit, that is, the diameter of the impact block 40 is slightly smaller than the inner diameter of the cylinder 20. Referring to fig. 4, in order to achieve the weight adjustment of the striking block 40, here, further, the striking block 40 includes an upper hemisphere 41, a lower hemisphere 42, a nut 43 and a weight block 44, when a screw 421 disposed in the lower hemisphere 42 forms a threaded fit with a threaded hole disposed in the upper hemisphere 41, the upper hemisphere 41 and the lower hemisphere 42 are just combined into a hollow sphere, an axial direction of the screw 421 is perpendicular to a surface where the upper hemisphere 41 and the lower hemisphere 42 are attached, the weight block 44 is sleeved on the screw 421, and the nut 43 is used for locking the weight block 44. So configured, a weight 44 may be added as needed to increase the weight of the impact block 40. In actual use, the upper hemisphere 41, the lower hemisphere 42, and the nut 43 can be used together as a basis weight, and the counterweight 44 can be provided with standard weights with various different outer diameters and thicknesses, and can be directly added as required like a balance weight. The impact block 40 thus constructed is still a sphere in shape without any change, but can be easily adjusted in weight.

Referring to fig. 3, the structure of the stopper 30 is various, the utility model discloses in preferably, the stopper 30 include interior stopper 31, outer stopper 32 and locating pin 33, set up breach or hole on the interior stopper 31 and supply the air current to pass through, the outside of interior stopper 31 is fixed with first magnet 311, outer stopper 32 cover is established and is fixed with second magnet 321 in barrel 20 outside and outer stopper 32's inboard, first magnet 311 and second magnet 321 magnetism attract each other, top-down is provided with pinhole 21 on the perisporium of barrel 20 and supplies locating pin 33 to pass, locating pin 33 is fixed interior stopper 31 and outer stopper 32 together. Through setting up interior dog 31 and outer dog 32 and fixed first magnet 311 and second magnet 321 above them, when the size of interior dog 31 is adjusted to needs, need not to dismantle other parts like this, directly move outer dog 32 can, outer dog 32 is when removing for interior dog 31 can the synchro-generator remove, very convenience during the regulation because the magnetic force between first magnet 311 and the second magnet 321. After the proper position is adjusted, the inner stop block 31 and the outer stop block 32 are fixed on the pin hole 21 through the positioning pin 33, and therefore the inner stop block 31 can play a good role in resisting during testing.

Negative pressure unit 50's structure has a lot of, can provide the negative pressure through the vacuum pump, also can provide the negative pressure through air compressor machine 51 and vacuum generator 53, the utility model discloses in, preferably, negative pressure unit 50 include air compressor machine 51, solenoid valve 52 and vacuum generator 53, solenoid valve 52 is open two vent valve in usual, the air inlet of solenoid valve 52 is connected to air compressor machine 51's gas outlet, vacuum generator 53's air inlet is connected to solenoid valve 52's gas outlet, the upper end of barrel 20 is sealed through the lid, covers to set up the negative pressure mouth that has the gas pocket and vacuum generator 53 and links to each other. Thus, during testing, only the air compressor 51 needs to be opened, the air compressor 51 can generate enough positive pressure, the positive pressure flows to the vacuum generator 53 through the normally open two-way valve, the inner cavity of the cylinder body 20 is connected through the negative pressure port of the vacuum generator 53, and negative pressure is formed in the inner cavity of the cylinder body 20. Air leakage occurs through the pin holes 21 of the cylinder 20, the gaps between the striking block 40 and the cylinder 20, but the negative pressure is strong enough as long as the pressure of the air compressor 51 is sufficient. In actual testing, the pressure of the air compressor 51 is sufficient to ensure that the impact block 40 can be sucked up.

The control unit 60 has various control modes, for example, the simplest mode is that a manual switch is used to control the on-off of the electromagnetic valve 52, and when the electronic device needs to fall, the switch is pressed to turn off the electromagnetic valve 52, so that the negative pressure disappears; when the impact block 40 falls onto the object to be tested and bounces, the switch is immediately released, the electromagnetic valve 52 is switched on, negative pressure is generated, and the impact block 40 is sucked up. In order to make the use more convenient, the utility model provides three kinds of comparatively preferred embodiments for reference.

Referring to fig. 5, in the first embodiment, the control unit 60 includes a laser range finder 61, a processing module 62 and a key switch 63, the laser range finder 61 is a very mature product, and can directly purchase a finished product, the laser range finder 61 is disposed outside the cylinder 20 for detecting the height of the outer stopper 32 and outputting the detected value to the processing module 62, since the distance difference between the outer stopper 32 and the impact block 40 is a fixed value, the device can write the value into the processing module 62 after processing, the processing module 62 calculates the height value h of the impact block 40 according to the height of the outer stopper 32, the calculation process is simple, and only simple plus-minus, and the falling time t of the impact block 40 is calculated according to the height value h₁This can be based on the free fall formula

And (6) calculating. The processing module 62 controls the solenoid valve 52 to open and delay the time t when the key switch 63 is pressed₁The solenoid valve 52 is switched on again after + Δ t, Δ t being the delay time previously stored in the processing module 62, and the impact block 40 starts to fall after the key switch 63 is pressedFall over time t₁Then the object to be tested is hit, then the rebound occurs, we need to suck the object during the rebound, so the electromagnetic valve 52 is switched on after the time of delta t, and the value of delta t can be [0, t₂)，t₂Is the time it takes for the impact mass 40 to impact from the first to the second, this at typically takes a fraction of a second when actually tested.

Referring to fig. 6, in the second embodiment, the control unit 60 includes a human-computer interaction module 64 and a processing module 62, the human-computer interaction module 64 directly outputs the height value h input by the user to the processing module 62, and the processing module 62 calculates the falling time t of the impact block 40 according to the height value h₁When the human-computer interaction module 64 receives the starting command of the user, the processing module 62 controls the electromagnetic valve 52 to be switched off and delays the time t₁The solenoid valve 52 is again turned on after + Δ t, Δ t being the delay time previously stored in the processing module 62. The barrel 20 is provided with a plurality of pin holes 21, when the stop block 30 is fixed at a certain pin hole 21, the height of the corresponding impact block 40 is determined, so that the corresponding test height value can be marked beside the pin hole 21, and thus, the height can be known only by looking at the mark beside the pin hole 21 where the stop block 30 is located, and the user can conveniently input the height in the man-machine interaction module 64; of course, when the man-machine interaction module 64 inputs the height value, the number of the pin hole 21 may be input, and the processing module 62 stores the height corresponding to the number of the pin hole 21; the height value can also be selected directly by using an up and down selection key. The human-computer interaction module 64 may be a small touch screen, which may be a combination of a common liquid crystal display and keys. After the height value h is obtained, the subsequent processing manner is similar to that in the first embodiment, and is not described here again.

Referring to fig. 7, in a third embodiment, the control unit 60 includes a processing module 62 and a key switch 63, a first contact 22 and a second contact 23 are disposed beside a pin hole 21 of the cylinder 20, a third contact 322 and a fourth contact 323 which are conducted with each other are disposed inside the external stopper 32, and when the external stopper 32 is located at any pin hole 21, the first contact 22 beside the pin hole 21 is conducted with the second contact 23 through the third contact 322 and the fourth contact 323; processing module62 detects the conduction state of the first contact 22 and the second contact 23 beside each pin hole 21 and calculates the falling time t of the impact block 40 according to the position of the conducted pin hole 21₁The processing module 62 controls the solenoid valve 52 to open and delay the time t when the key switch 63 is pressed₁The solenoid valve 52 is again turned on after + Δ t, Δ t being the delay time previously stored in the processing module 62. By arranging the first contact 22 and the second contact 23 beside the pin hole 21, the position of the pin hole 21 where the stopper 30 is located can be judged by monitoring the conduction condition of the first contact 22 and the second contact 23, so that the height value of the impact block 40 can be conveniently known.

The first embodiment and the third embodiment are all automatically height measuring and processing, when the device is used for measuring, if the height of the stop block 30 needs to be adjusted, the positioning pin 33 is directly loosened, then the stop block 30 is adjusted to a proper height and then the positioning pin 33 is locked, then the key switch 63 is directly pressed to test, the control unit 60 can automatically acquire the change of the height value, and the delay time t can be automatically changed₁+ Δ t, easy to use and simpler to operate. In the second embodiment, the height value needs to be manually input, and the method is not automatic enough, but has very low cost and is easy to popularize.

Further, referring to fig. 1 and 2, the inspection table 10 includes a table top 11, supporting legs 12 and a support 13, the table top 11 is used for placing an object to be inspected, the supporting legs 12 are arranged below the table top 11 for supporting the table top 11, and the support 13 is arranged beside the table top 11; the support 13 comprises a T-shaped frame 131, an upper connecting plate 132 and a lower connecting plate 133, a transverse rod section of the T-shaped frame 131 is fixed on the table top 11, the upper connecting plate 132 and the lower connecting plate 133 are respectively arranged at the upper end and the lower end of a longitudinal rod section of the T-shaped frame 131, the barrel 20 is parallel to the longitudinal rod section of the T-shaped frame 131, and two ends of the barrel 20 are fixed on the T-shaped frame 131 through the upper connecting plate 132 and the lower connecting plate 133. The T-shaped frame 131, the upper connecting plate 132 and the lower connecting plate 133 are arranged, so that the barrel body 20 can be fixed very reliably, and the installation and the disassembly are also very convenient. In the drawings of the utility model, a convex column is arranged on the T-shaped frame 131 for fixing the control unit 60, which is convenient for operation.

Because many times need test to the certain point of the article that awaits measuring, in order to guarantee the accuracy of drop test placement, the utility model discloses in preferably, including mark unit 70, mark unit 70 comprises laser lamp 71 and lighting fixture 72, and laser lamp 71 passes through lighting fixture 72 to be fixed on T type frame 131, and lighting fixture 72 is used for adjusting the direction of illumination of laser lamp 71, and laser lamp 71 is used for the mark to strike the placement that piece 40 is located mesa 11. After the marking unit 70 is arranged, before testing, the angle of the laser lamp 71 is firstly adjusted to enable the laser lamp 71 to just point to the falling point of the impact block 40 on the table board 11, and when an article to be tested is placed, the point to be tested is aligned with the point of the table board 11 irradiated by the laser lamp 71, so that the accuracy of the falling point to be tested can be ensured, and the reliability of the testing process is also ensured.

Claims (7)

1. A drop test device is characterized in that: including examining test table (10), barrel (20), striking piece (40), negative pressure unit (50) and the control unit (60), examine test table (10) and be used for placing the article that await measuring, barrel (20) set up directly over the article that await measuring, striking piece (40) are located barrel (20) and can be followed and prolonged barrel (20) and reciprocate, negative pressure unit (50) provide the negative pressure for barrel (20) inner chamber above striking piece (40), the start-up and the stop of control unit (60) control negative pressure unit (50).

2. The drop test apparatus of claim 1, wherein: a stop block (30) is arranged in the cylinder body (20), and the height of the stop block (30) in the cylinder body (20) is adjustable; the impact block (40) is positioned in the barrel body (20) below the stop block (30), the impact block (40) moves upwards and abuts against the stop block (30) when the negative pressure unit (50) is started, and the impact block (40) falls on an object to be tested under the action of gravity when the negative pressure unit (50) is stopped.

3. The drop test apparatus of claim 2, wherein: the section of the cylinder body (20) is circular, the impact block (40) is a sphere, and the impact block (40) and the cylinder body (20) form clearance fit; striking piece (40) are including upper hemisphere (41), lower hemisphere (42), nut (43) and balancing weight (44), upper hemisphere (41) and lower hemisphere (42) just in time make up a hollow spheroid when being provided with the screw hole in screw rod (421) and the upper hemisphere (41) that set up in lower hemisphere (42) and screw-thread fit, the face of laminating of axle core direction perpendicular to upper hemisphere (41) and lower hemisphere (42) of screw rod (421), balancing weight (44) cover is established on screw rod (421), nut (43) are used for locking balancing weight (44).

4. A drop test apparatus as claimed in claim 3, wherein: the stop block (30) comprises an inner stop block (31), an outer stop block (32) and a positioning pin (33), wherein a notch or a hole is formed in the inner stop block (31) and is used for air flow to pass through, a first magnet (311) is fixed on the outer side of the inner stop block (31), a second magnet (321) is fixed on the outer side of the barrel body (20) and the inner side of the outer stop block (32) in a sleeved mode through the outer stop block (32), the first magnet (311) and the second magnet (321) are attracted magnetically, a pin hole (21) is formed in the peripheral wall of the barrel body (20) from top to bottom and is used for the positioning pin (33) to pass through, and the inner stop block (31) and the outer stop block (32.

5. The drop test apparatus of claim 4, wherein: the negative pressure unit (50) comprises an air compressor (51), an electromagnetic valve (52) and a vacuum generator (53), the electromagnetic valve (52) is a normally open two-way air valve, an air outlet of the air compressor (51) is connected with an air inlet of the electromagnetic valve (52), an air outlet of the electromagnetic valve (52) is connected with an air inlet of the vacuum generator (53), the upper end of the cylinder body (20) is sealed through a cover, and an air hole is formed in the cover and connected with a negative pressure port of the vacuum generator (53).

6. The drop test apparatus of claim 5, wherein: the detection table (10) comprises a table top (11), supporting legs (12) and a support (13), the table top (11) is used for placing an object to be detected, the supporting legs (12) are arranged below the table top (11) and used for supporting the table top (11), and the support (13) is arranged beside the table top (11); support (13) are including T type frame (131), upper junction plate (132) and lower connecting plate (133), and the horizontal pole section of T type frame (131) is fixed on mesa (11), and upper junction plate (132) and lower connecting plate (133) set up respectively in the upper end and the lower extreme position department of the vertical pole section of T type frame (131), and barrel (20) are on a parallel with the vertical pole section of T type frame (131) and the both ends of barrel (20) are fixed on T type frame (131) through upper junction plate (132) and lower connecting plate (133).

7. The drop test apparatus of claim 6, wherein: the laser impact block positioning device comprises a marking unit (70), wherein the marking unit (70) is composed of a laser lamp (71) and a lamp holder (72), the laser lamp (71) is fixed on a T-shaped frame (131) through the lamp holder (72), the lamp holder (72) is used for adjusting the irradiation direction of the laser lamp (71), and the laser lamp (71) is used for marking the falling point of an impact block (40) on a table board (11).

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