CN110456204B - Electric stay bar performance testing device and testing method - Google Patents
Electric stay bar performance testing device and testing method Download PDFInfo
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- CN110456204B CN110456204B CN201910808337.8A CN201910808337A CN110456204B CN 110456204 B CN110456204 B CN 110456204B CN 201910808337 A CN201910808337 A CN 201910808337A CN 110456204 B CN110456204 B CN 110456204B
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 27
- 230000004044 response Effects 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 8
- 230000006835 compression Effects 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a device and a method for testing performance of an electric stay bar, and belongs to the technical field of electric stay bars. The testing device comprises a screw rod sliding table provided with a servo motor, wherein a first clamping unit and a second clamping unit for fixing a ball head of an electric stay rod to be tested are respectively arranged at two ends of the screw rod sliding table, the second clamping unit is in sliding connection with the screw rod sliding table, a force sensor is arranged between the second clamping unit and a sliding block, the force sensor is used for controlling the pressure between the second clamping unit and the sliding block, the servo motor can indirectly control the compression stroke of the electric stay rod through controlling the linear displacement of the sliding block, and the compression force of the electric stay rod is measured under the accurate compression stroke. According to the invention, at least 10 groups of data are taken at the position 10mm plus or minus 1mm away from the maximum extension and maximum compression of the electric stay bar, and the average value is taken, so that the measurement error caused by wave crests and wave troughs is avoided.
Description
Technical Field
The invention relates to the technical field of mechanical detection, in particular to an electric stay bar performance testing device and a testing method.
Background
The electric stay bar is an electric lifting mechanism arranged between the electric tail door and the car body of the car, and the electric lifting mechanism is driven by an electric motor to lift the tail door so as to be convenient to operate. The common form of the electric lifting mechanism is a telescopic electric stay.
It is well known that mass-produced electric struts require qualification prior to assembly into an automobile. In the traditional method, an electric stay bar is clamped in a testing device, a screw rod parallel to the electric stay bar is arranged in the testing device, the electric stay bar is rotationally compressed through a servo motor connected to the screw rod, and meanwhile, the compression stroke and the compression force of the electric stay bar are measured. However, because the pressure value and the compression stroke of the electric brace rod are in a waveform curve, the servo motor test only measures a few points in the test process, so that the deviation of the value point is larger, and the actual performance of the product cannot be reflected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an electric stay bar performance testing device and a testing method.
The technical scheme provided by the invention is as follows:
The device comprises a screw rod sliding table, wherein the screw rod sliding table comprises a sliding table servo motor, a screw rod and a sliding block, a first clamping unit and a second clamping unit for fixing ball heads at two ends of an electric supporting rod to be tested are arranged on the screw rod sliding table, the first clamping unit is fixed on the screw rod sliding table, the second clamping unit is connected with the screw rod sliding table through a sliding rail parallel to the screw rod, the second clamping unit is positioned between the sliding block and the first clamping unit, and the electric supporting rod is parallel to the screw rod; a force sensor is arranged between the second clamping unit and the sliding block and is used for measuring the pressure between the sliding block and the second clamping unit.
On the basis of the technical scheme, the screw rod is parallel to the table surface of the screw rod sliding table, one end of the screw rod is connected with a sliding table servo motor fixed on the screw rod sliding table, and an output shaft of the sliding table servo motor is connected with the screw rod and drives the screw rod to rotate.
On the basis of the technical scheme, the force sensor is fixed on the second clamping unit.
On the basis of the technical scheme, the force sensor is connected with the screw rod sliding table through the sliding rail.
On the basis of the technical scheme, the first clamping unit and the second clamping unit are respectively provided with a ball head buckle for fixing the ball head of the electric stay bar.
On the basis of the technical scheme, a pressure alarm is arranged in the ball head buckle on the second clamping unit.
On the basis of the technical scheme, the electric stay bar performance testing device is provided with a first power supply and a second power supply, the first power supply is used for supplying power to the motor in the electric stay bar, and the second power supply is used for supplying power to the servo motor of the sliding table.
On the basis of the technical scheme, the device further comprises a control system, and the control system comprises:
a stay bar motor controller for controlling the rotation speed and the steering of the motor in the electric stay bar,
A slipway servo motor controller for controlling the rotating speed and steering of the slipway servo motor,
The control computer is internally provided with control software and data processing software for performing man-machine interaction, controlling the movement of the electric stay bar, and recording and storing test data; the stay bar motor controller and the sliding table servo motor controller are both connected to the control computer, and each measuring module is connected to the control computer through the data acquisition device respectively.
A testing method utilizing the electric stay bar performance testing device comprises the following steps:
Fixing the testing device on a vertical plane, and enabling the electric stay bars of the upper clamping unit, the lower clamping unit and the second clamping unit, which are fixed in the testing device, to be in a vertical direction;
The control stay bar motor is not electrified, and the sliding table servo motor is electrified: the sliding block starts upwards from the original point of the sliding block at the speed V 1, and when the force sensor signal is a preset force value F 0, the displacement of the sliding block is recorded as d; when the sliding block reaches a preset sliding block displacement L max, controlling the sliding block to move downwards at a speed V 2; when the sliding block returns to the position where the sliding block displacement is L 2 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 1 is obtained; when the sliding block returns to the position where the sliding block displacement is L 1 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 2 is obtained;
When the sliding block returns to the position where the displacement of the sliding block is d, a counterweight is loaded on the second clamping unit, the supporting rod motor and the sliding table servo motor are controlled to be simultaneously electrified, the sliding block moves upwards at the speed V 1, and when the sliding block reaches the preset displacement L max of the sliding block, the sliding block is controlled to move downwards at the speed V 2; when the sliding block returns to the position where the sliding block displacement is L 2 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 3 is obtained; when the sliding block returns to the position where the sliding block displacement is L 1 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 4 is obtained.
On the basis of the technical scheme, the preset force value F 0 =100deg.N, and the response time of the force sensor is 20 ms.
Based on the technical scheme, L 1＝d+10mm,L2＝Lmax -10mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The size of the displacement d of the sliding block from the original point of the sliding block to the force sensor when the signal of the force sensor is a preset force value F 0 can be used for judging whether the electric stay bar has a part missing.
(2) According to the invention, at least 10 groups of data are taken at the position 10 mm+/-1 mm away from the maximum extension and maximum compression of the electric stay bar, the measurement result is an average value, and errors caused by wave crests and wave troughs are avoided.
Drawings
FIG. 1 is a schematic diagram of a testing apparatus according to the present invention;
In the figure: 1. a slipway servo motor; 2. a slide block; 3. a force sensor; 4. an electric stay bar; 5. a first clamping unit; 6. and the second clamping unit.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that, the term "origin of the slider" refers to a fixed point on the device, which is the initial position of the slider, and the term "measurement origin" refers to the position when the compression stroke of the electric stay is 0.
Example 1
Referring to fig. 1, the device for testing the performance of the electric stay bar provided by the embodiment of the invention comprises a screw rod sliding table, wherein the screw rod sliding table comprises a sliding table servo motor, a screw rod and a sliding block, a first clamping unit and a second clamping unit for fixing ball heads at two ends of the electric stay bar to be tested are arranged on the screw rod sliding table, the first clamping unit is fixed on the screw rod sliding table, the second clamping unit is connected with the screw rod sliding table through a sliding rail parallel to the screw rod, the second clamping unit is positioned between the sliding block and the first clamping unit, and the electric stay bar is parallel to the screw rod; a force sensor is arranged between the second clamping unit and the sliding block and is used for measuring the pressure between the sliding block and the second clamping unit.
On the basis of the technical scheme, the screw rod is parallel to the table surface of the screw rod sliding table, one end of the screw rod is connected with a sliding table servo motor fixed on the screw rod sliding table, and an output shaft of the sliding table servo motor is connected with the screw rod and drives the screw rod to rotate.
On the basis of the technical scheme, the force sensor is fixed on the second clamping unit.
On the basis of the technical scheme, the force sensor is connected with the screw rod sliding table through the sliding rail.
On the basis of the technical scheme, the first clamping unit and the second clamping unit are respectively provided with a ball head buckle for fixing the ball head of the electric stay bar.
On the basis of the technical scheme, a pressure alarm is arranged in the ball head buckle on the second clamping unit.
On the basis of the technical scheme, the electric stay bar performance testing device is provided with a first power supply and a second power supply, the first power supply is used for supplying power to the motor in the electric stay bar, and the second power supply is used for supplying power to the servo motor of the sliding table.
On the basis of the technical scheme, the device further comprises a control system, and the control system comprises:
a stay bar motor controller for controlling the rotation speed and the steering of the motor in the electric stay bar,
A slipway servo motor controller for controlling the rotating speed and steering of the slipway servo motor,
The control computer is internally provided with control software and data processing software for performing man-machine interaction, controlling the movement of the electric stay bar, and recording and storing test data; the stay bar motor controller and the sliding table servo motor controller are both connected to the control computer, and each measuring module is connected to the control computer through the data acquisition device respectively.
Specifically, an encoder is arranged in the servo motor, and the encoder is used for recording the pulse number sent by the sliding table servo motor and converting the pulse number into linear displacement of the sliding block.
The invention provides a performance test method of an electric stay bar, which comprises the following steps:
The process for testing the performance of the electric stay bar by using the invention is as follows:
(1) Fixing the testing device on a vertical plane, and enabling the electric stay bars of the upper clamping unit, the lower clamping unit and the second clamping unit, which are fixed in the testing device, to be in a vertical direction; the electric stay bar assembly is clamped in the testing device, and after the pressure alarm senses the preset 50N pressure, an alarm is sent out to confirm that the electric stay bar assembly is placed in place, and at the moment, the sliding block is located at the original point of the sliding block;
(2) When the first power supply is connected, the sliding table servo motor starts to rotate, the output shaft of the sliding table servo motor drives the screw rod to rotate, the screw rod drives the sliding block to move linearly upwards at the speed of 300mm/min, the sliding block moves forward to push the second clamping unit to compress the electric supporting rod, and when the force sensor senses the pressure of the sliding block 100N, the displacement d of the sliding block is recorded, and the compression stroke of the electric supporting rod is 0;
(3) When the sliding block reaches the set maximum displacement L max, the sliding table servo motor reversely rotates, the sliding block moves downwards in a straight line at the speed of 300mm/min, the electric supporting rod stretches and releases, when the sliding block displacement is L max -10mm plus or minus 0.5mm, 10 groups of force value data are recorded, and the average value F 1 is calculated; when the displacement of the sliding block is 10+/-0.5 mm, recording 10 groups of data, and calculating to obtain an average value F 2;
(4) The servo motor runs to compression stroke L=0 department, pauses, loads the heavy burden weight on second joint unit, switch on first power and second power simultaneously, and motor begins the operation in the electric stay bar, and the slider upwards promotes second joint unit: when the sliding block reaches the set maximum displacement L max, the sliding table servo motor reversely rotates, the sliding block moves downwards in a straight line at the speed of 300mm/min, the electric stay rod stretches and releases, and when the sliding block displacement is L max -10mm plus or minus 0.5mm, the average value F 3 is calculated by 10 groups of force values of the force sensor; and taking 10 groups of force values of the force sensor when the displacement of the sliding block is 10+/-0.5 mm, and calculating to obtain an average value F 4.
Compared with the same industry, the power of the stay bar product is derived from the internal spring, and the force value of two position points at the moment of opening and closing the automobile tail door is important. When the tail door is in an open state and the sliding block is displaced by L max -10mm, the force at the moment needs to be enough to overcome the weight of the tail door, and when the tail door is stretched to the highest point, the position marked as the position of the sliding block displacement is 10mm, the electric stay bar can support the tail door, and the tail door cannot slide off. It is believed that the electric stay as a safety regulation requires strengthening of this control point for the spring itself, and certain force values for compression extension strokes L max -10mm and 10mm, and that the motor of the electric stay is de-energized during compression extension as we said above, and the spring needs to meet the corresponding force values (tolerance + -40N) at these two points.
The electric stay bar is internally provided with a flat pad with the thickness of about 2mm, neglected loading is easy to occur in the production and assembly process, and the electric stay bar is difficult to find out in the experimental process, the total length of stay bar parts in the same batch is basically within the tolerance of 1mm after the stay bar parts are assembled, and if one flat pad with the thickness of 2mm is missing in the electric stay bar, d can deviate by more than 2mm, so that the relative distance d from the original point of the sliding block to the measurement zero point can be used as a means for judging the neglected loading parts.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (8)
1. The testing method for the electric stay bar performance testing device is characterized by comprising a screw rod sliding table, wherein the screw rod sliding table comprises a sliding table servo motor (1), a screw rod and a sliding block (2), a first clamping unit (5) and a second clamping unit (6) for fixing ball heads at two ends of an electric stay bar (4) to be tested are arranged on the screw rod sliding table, the first clamping unit (5) is fixed on the screw rod sliding table, the second clamping unit (6) is connected with the screw rod sliding table through a sliding rail parallel to the screw rod, the second clamping unit (6) is located between the sliding block (2) and the first clamping unit (5), and the electric stay bar (4) is parallel to the screw rod; a force sensor (3) is arranged between the second clamping unit (6) and the sliding block (2), and the force sensor is used for measuring the pressure between the sliding block (2) and the second clamping unit (6);
The test method comprises the following steps:
Fixing the testing device on a vertical plane, and enabling the electric stay bars of the upper clamping unit, the lower clamping unit and the second clamping unit, which are fixed in the testing device, to be in a vertical direction;
The control stay bar motor is not electrified, and the sliding table servo motor is electrified: the sliding block starts upwards from the original point of the sliding block at the speed V 1, and when the force sensor signal is a preset force value F 0, the displacement of the sliding block is recorded as d; when the sliding block reaches a preset sliding block displacement L max, controlling the sliding block to move downwards at a speed V 2; when the sliding block returns to the position where the sliding block displacement is L 2 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 1 is obtained; when the sliding block returns to the position where the sliding block displacement is L 1 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 2 is obtained;
When the sliding block returns to the position where the displacement of the sliding block is d, a counterweight is loaded on the second clamping unit, the supporting rod motor and the sliding table servo motor are controlled to be simultaneously electrified, the sliding block moves upwards at the speed V 1, and when the sliding block reaches the preset displacement L max of the sliding block, the sliding block is controlled to move downwards at the speed V 2; when the sliding block returns to the position where the sliding block displacement is L 2 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 3 is obtained; when the sliding block returns to the position where the sliding block displacement is L 1 +/-0.5 mm, the force sensor is controlled to grasp a plurality of groups of mechanical signals, and an average value F 4 is obtained;
Wherein L 1＝d+10mm,L2＝Lmax -10mm.
2. The test method according to claim 1, wherein: the force value F 0＝100N,V1＝V2 is preset.
3. The test method according to claim 1, wherein: the response time of the force sensor is 20ms.
4. The test method according to claim 1, wherein: the screw rod is parallel to the table top of the screw rod sliding table, one end of the screw rod is connected with a sliding table servo motor (1) fixed on the screw rod sliding table, and an output shaft of the sliding table servo motor (1) is connected with the screw rod and drives the screw rod to rotate.
5. The test method according to claim 1, wherein: the force sensor (3) is fixed on the second clamping unit (6).
6. The test method according to claim 1, wherein: the force sensor (3) is connected with the screw rod sliding table through a sliding rail.
7. The test method according to claim 1, wherein: and ball head buckles used for fixing the ball heads of the electric stay bars are respectively arranged on the first clamping unit (5) and the second clamping unit (6).
8. The test method according to claim 7, wherein: a pressure alarm is arranged in a ball head buckle on the second clamping unit (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910808337.8A CN110456204B (en) | 2019-08-29 | 2019-08-29 | Electric stay bar performance testing device and testing method |
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| CN201910808337.8A CN110456204B (en) | 2019-08-29 | 2019-08-29 | Electric stay bar performance testing device and testing method |
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| CN110456204B true CN110456204B (en) | 2024-05-14 |
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| CN116539206B (en) * | 2023-06-30 | 2023-09-19 | 武汉东湖学院 | Stress application mechanism of high-precision force measurement equipment |
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