CN107817119B - Comprehensive impact test bed for automobile steering component and detection method thereof - Google Patents
Comprehensive impact test bed for automobile steering component and detection method thereof Download PDFInfo
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- CN107817119B CN107817119B CN201711275456.9A CN201711275456A CN107817119B CN 107817119 B CN107817119 B CN 107817119B CN 201711275456 A CN201711275456 A CN 201711275456A CN 107817119 B CN107817119 B CN 107817119B
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- 238000009863 impact test Methods 0.000 title claims abstract description 55
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 76
- 238000013016 damping Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 5
- 230000003116 impacting effect Effects 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000007704 transition Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005477 standard model Effects 0.000 description 1
Classifications
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/06—Steering behaviour; Rolling behaviour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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Abstract
The invention discloses an automobile steering component a comprehensive impact test bed and a detection method thereof, the test bed comprises a main body supporting structure, a pendulum clamp, a drop hammer clamp, a pendulum assembly, a drop hammer assembly, a pendulum unhooking device, a drop hammer unhooking device, a first lifter, a second lifter, a locking device and a drop hammer anti-impact device. The invention can perform pendulum impact test and drop impact test, and the automobile steering component comprehensive impact test bed can directly perform impact load test on a test sample by utilizing free falling motion of the pendulum assembly and the drop assembly to act on the test sample. Through the lift, realize remote control for the security obtains very big promotion, and through the feedback of sensor, makes drop weight lifting height and pendulum weight lifting angle more accurate, so alright convenient detection test sample's load capacity that shocks resistance, the testing result is more accurate.
Description
Technical Field
The invention relates to the technical field of automobile part detection, in particular to an automobile steering part comprehensive impact test bed and a detection method thereof.
Background
In the field of automobiles, with the continuous development of society, with continuous progress in science and technology, the types of automobiles are more and more, the use of EPS (electric power steering) is increasing, and the worm gear and rack-and-pinion mechanism in its structure receives certain impact load during use. Since there is no automatic control in the prior art a device for the shock resistance of a worm and a gear rack, in addition, the material characteristics of the worm gear and the rack and the pinion are generally adopted in the prior art to judge the impact load resistance of the worm gear and the rack or manually adjust the impact angle of the pendulum, and the problem of large judgment error still exists although the use requirement can be met to a certain extent.
Disclosure of Invention
It is an object of the present invention to provide a structure that is stable, the automatic control of the device can be realized, the comprehensive impact test bed for the automobile steering component has simple operation, complete functions and good performance; the invention further aims to provide a rapid and accurate detection method for the automobile steering component by using the comprehensive impact test bed. According to the comprehensive impact test bed for the automobile steering component and the detection method thereof, the impact load resistance of the workpiece is detected through two different forms of a pendulum bob and a drop bob.
In order to achieve the above object, the present invention provides the following technical solutions:
the comprehensive impact test bed for the automobile steering part comprises a pendulum assembly for performing a pendulum impact test and a drop hammer assembly for performing a drop hammer impact test;
the pendulum assembly comprises a pendulum impact support frame; the lower part of the front side of the pendulum impact support frame is horizontally provided with a pendulum clamp for clamping a test sample, and the rear side of the pendulum impact support frame is provided with a first pulley device and a first lifter; after the first flexible rope bypasses the first pulley device, one end of the first flexible rope is connected with an output shaft of the first lifter, and the other end of the first flexible rope is connected with the pendulum unhooking device; the pendulum unhooking device is connected with a pendulum assembly which is arranged on the front side of the pendulum impact support frame and is used for applying swing impact to a test sample on the pendulum clamp; locking devices capable of locking the pendulum bob assembly are arranged on two sides of the pendulum bob assembly;
the drop hammer assembly comprises a drop hammer impact supporting frame; the lower part of the drop hammer impact supporting frame is vertically provided with a drop hammer clamp for clamping a test sample piece, and the upper part of the drop hammer impact supporting frame is provided with a second pulley device and a second lifter; one end of the second flexible rope is connected with the output shaft of the second lifter after bypassing the second pulley device, and the other end of the second flexible rope is connected with the drop hammer unhooking device; the drop hammer unhooking device is connected with a drop hammer assembly which is arranged at the upper part of the drop hammer impact supporting frame and is used for applying vertical impact to the test sample piece on the drop hammer clamp; and a drop hammer anti-impact device is arranged close to the drop hammer clamp.
Preferably, the pendulum impact support frame comprises a first bottom platform, and a first bracket and a second bracket respectively fixedly arranged at the front side and the rear side of the top surface of the first bottom platform;
the first pulley device is arranged at the top of the first bracket, and the first lifter is arranged at the upper part of the first bracket;
the pendulum assembly is mounted on the second support, the pendulum clamp is horizontally mounted on the top surface of the first bottom platform and located below the second support, and the locking device is mounted on the top surface of the first bottom platform and close to the pendulum assembly.
Preferably, the pendulum assembly includes:
the support block is fixedly connected with the top of the second bracket;
the swinging rod is positioned between the top of the second bracket and the top surface of the first bottom platform, one end of the swinging rod is hinged with the supporting block, and the other end of the swinging rod is hinged with the balancing weight; the balancing weight is provided with a collision block for striking the test sample piece on the pendulum bob clamp;
and the angle encoder is connected with the second bracket and is used for measuring the swinging angle of the swinging rod.
Preferably, the first pulley device comprises two first bearing seats mounted on the top of the first bracket, a first intermediate shaft rotatably connected between the first bearing seats, and a first pulley assembled on the first intermediate shaft and rotating along with the first intermediate shaft;
the first flexible rope is passed around the first pulley;
the pendulum unhooking device includes:
a first connection frame connected to an end of the first flexible rope;
the bottom of the cylinder barrel of the first cylinder is hinged with one end of the first connecting frame;
one end of the first fixing frame is fixedly connected with the other end of the first connecting frame;
one end of the first rotating rod is hinged with a piston rod in the first cylinder, and the other end of the first rotating rod is hinged with the first fixing frame;
the cylinder barrel of the second cylinder is fixedly connected with the other end of the first fixing frame; a piston rod in the second cylinder is connected with a first locking pin, and the first locking pin is matched with the first rotating rod to control the swing of the swing rod.
Preferably, the pendulum bob clamp comprises a first T-shaped groove strip and a first clamp locking block which are fixedly arranged on the top surface of the first bottom platform; the two ends of the first T-shaped groove strip are respectively provided with a first supporting block, and a test sample piece is placed between the two first supporting blocks; the first clamp locking block is close to the tail of the first T-shaped groove strip and is used for clamping a test sample;
the locking devices positioned on two sides of the pendulum assembly have the same structure, and comprise a base body, a third cylinder, a locking top plate and a damping plate, wherein the base body is fixed on the top surface of the first bottom platform and is close to the balancing weight, the bottom of the cylinder barrel is hinged with the base body, the locking top plate is hinged with a piston rod in the third cylinder, and the damping plate is connected with the locking top plate; the damping plates in the two locking devices are opposite to each other, and the balancing weights can be clamped or loosened under the drive of the third air cylinder.
Preferably, the drop hammer impact supporting frame comprises a second bottom platform and a third bracket fixedly arranged on the top surface of the second bottom platform;
the second pulley device is arranged at the top of the third bracket, and the second lifter is arranged at the upper part of the third bracket;
the drop hammer assembly and the drop hammer clamp are arranged on the same side of the third bracket, and the drop hammer clamp is positioned at the lower part of the third bracket;
the drop hammer impact prevention device is mounted on the top surface of the second bottom platform and is close to the drop hammer clamp.
Preferably, the drop hammer assembly comprises:
the bottom plate is fixedly connected with the top surface of the second bottom platform;
a fixing plate connected to the third bracket;
the guide post is vertically connected between the bottom plate and the fixed plate;
a guide plate slidably mounted on the guide post;
a weight plate mounted on the guide plate;
and the impact block is fixedly arranged on the guide plate and is used for impacting the test sample piece on the drop hammer clamp.
Preferably, the second pulley device comprises two second bearings mounted on the top of the third bracket, a second intermediate shaft rotatably connected between the second bearings, and a second pulley mounted on the second intermediate shaft and rotating with the second intermediate shaft;
the second flexible rope is passed around the second pulley;
the drop hammer unhooking device comprises:
a second link connected to an end of the second flexible rope;
the bottom of the cylinder barrel of the fourth cylinder is hinged with one end of the second connecting frame;
one end of the second fixing frame is fixedly connected with the other end of the second connecting frame;
one end of the second rotating rod is hinged with a piston rod in the fourth cylinder, and the other end of the second rotating rod is hinged with a second fixing frame;
the cylinder barrel of the fifth cylinder is fixedly connected with the other end of the second fixing frame; and a piston rod in the fifth cylinder is connected with a second locking pin, and the second locking pin is matched with the second rotating rod to control the sliding of the guide plate.
Preferably, the drop hammer clamp comprises a second T-shaped groove strip and a second clamp locking block which are fixedly arranged on the third bracket; two ends of the second T-shaped groove strip are respectively provided with a second supporting block, and a test sample piece is placed between the two second supporting blocks; the second clamp locking block is close to the tail of the second T-shaped groove strip and is used for clamping the test sample;
the drop hammer anti-impact device comprises a sixth air cylinder, the bottom of the cylinder barrel is fixed on the top surface of the second bottom platform and is close to the drop hammer clamp, and a damping block used for being in contact with the guide plate is connected to a piston rod in the sixth air cylinder.
The detection method of the comprehensive impact test bed for the automobile steering component is as follows:
1. pendulum impact test
1) Clamping a test sample piece on a pendulum clamp, and installing a sensor at the position of the test sample piece to be impacted;
2) The pendulum bob component is connected with a pendulum bob unhooking device through a connecting hook;
3) Lifting the pendulum assembly to an angle using a first lift;
4) Starting the test, completing the test action after the test is performed for a set delay time, collecting and processing data generated by the sensor through the collecting board card, and drawing a curve of impact force and time;
2. drop hammer impact test
1) Clamping a test sample piece on a drop hammer clamp, and mounting a sensor at the position of the test sample piece to be impacted;
2) The drop hammer assembly is connected with a drop hammer unhooking device through a connecting hook;
3) Lifting the drop hammer assembly to a certain height by using a second lifter;
4) And (3) starting the test, completing the test action after the test is performed for a set delay time, collecting and processing data generated by the sensor through the collecting board card, and drawing a curve of impact force and time.
The comprehensive impact test stand for the automobile steering component and the detection method thereof provided by the invention can be used for pendulum impact test and drop impact test. The comprehensive impact test bed for the automobile steering component utilizes free falling body movement of the pendulum assembly and the falling weight assembly to act on a test sample, and can directly perform impact load test on the test sample. Through the lift, realize remote control for the security obtains very big promotion, and through the feedback of sensor, makes drop weight lifting height and pendulum weight lifting angle more accurate, so alright convenient detection test sample's load capacity that shocks resistance, the testing result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is an isometric view of an automobile steering component integrated impact test stand provided by an embodiment of the invention;
FIG. 2 is a left side view of an automobile steering component integrated impact test bed provided by an embodiment of the invention;
FIG. 3 is an isometric view of a main body support structure in an automobile steering component integrated impact test stand according to an embodiment of the present invention;
FIG. 4 is a block diagram of a pulley device in an integrated impact test stand for an automotive steering component according to an embodiment of the present invention;
FIG. 5 is a diagram showing the construction of a pendulum assembly in an integrated impact test stand for an automotive steering component according to an embodiment of the present invention;
FIG. 6 is a block diagram of a drop hammer assembly in an integrated impact test stand for an automotive steering component according to an embodiment of the present invention;
fig. 7 is a diagram showing the structure of a pendulum unhooking device and a drop hammer unhooking device in an automobile steering component integrated impact test stand according to an embodiment of the present invention;
FIG. 8 is a block diagram of a drop hammer assembly in an integrated impact test stand for an automotive steering component according to an embodiment of the present invention;
FIG. 9 is a diagram showing the construction of a pendulum bob clamp in an integrated impact test stand for an automobile steering component according to an embodiment of the present invention;
FIG. 10 is a block diagram of a drop hammer clamp in an automobile steering component comprehensive impact test bed provided by an embodiment of the invention;
FIG. 11 is a block diagram of a locking device in an automobile steering component comprehensive impact test bed provided by an embodiment of the invention;
fig. 12 is a block diagram of a drop hammer impact protection device in an automobile steering component comprehensive impact test stand according to an embodiment of the invention.
Reference numerals illustrate:
1. a main body support structure; 2. pendulum bob clamp; 3. a drop hammer clamp; 4. a pendulum assembly; 5. a drop hammer assembly; 6. a pendulum unhooking device; 7. drop hammer unhooking device; 8. a first elevator; 9. a second lifter; 10. locking device; 11. a drop hammer anti-impact device; 12. a lifter floor; 13. a bearing seat; 14. an intermediate shaft; 15. a pulley; 16. a blocking sleeve; 17. a first flexible cord; 18. a second flexible cord;
101. a first bottom platform; 102. a high upright; 103. a low column; 104. a cross beam; 105. a stiffening beam; 106. a second bottom platform;
201. a first T-shaped channel strip; 202. a first clamp locking block; 203. a first support block;
301. a second T-shaped channel strip; 302. a second clamp locking block; 303. a clamp support; 304. a second support block;
401. a support block; 402. a swinging rod; 403. balancing weight; 404. a bump; 405. a rotating shaft; 406. a transition block; 407. a connecting block;
501. a bottom plate; 502. a fixing plate; 503. a guide post; 504. a guide plate; 505. a weight plate; 506. an impact block; 507. a fixed sleeve; 508. a fixing seat;
601. a first connection frame; 602. a first cylinder; 603. a first fixing frame; 604. a first rotating lever; 605. a second cylinder; 606. a first pivot shaft; 607. a second pivot shaft; 608. a third pivot shaft; 609. a first locking pin;
701. a second connecting frame; 702. a fourth cylinder; 703. the second fixing frame; 704. a second rotating lever; 705. a fifth cylinder; 706. a fourth pivot shaft; 707. a fifth pivot shaft; 708. a sixth pivot shaft; 709. a second locking pin;
1001a, upper frame body; 1001b, foot rest; 1001c, tail board; 1002. a third cylinder; 1003. locking the top plate; 1004. a damping plate;
1101. a sixth cylinder; 1102. a damping block; 1103. a cylinder bracket;
A. a test sample; B. a mounting plate; C. a sensor; D. and (5) cushion blocks.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the statement "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article or terminal device comprising the element. Further, herein, "greater than," "less than," "exceeding," and the like are understood to not include the present number; "above", "below", "within" and the like are understood to include this number.
As shown in fig. 1 and 2, an integrated impact test stand for an automobile steering member includes a pendulum assembly for performing a pendulum impact test and a drop hammer assembly for a drop hammer impact test.
The pendulum assembly comprises a pendulum impact support frame, as shown in fig. 3, which is composed of a first bottom platform 101, two high uprights 102 and two low uprights 103, wherein the height of the high uprights 102 is higher than that of the low uprights 103. The first bottom platform 101 has a rectangular shape, and two high columns 102 are fixed side by side and vertically on a top surface side of the first bottom platform 101, and this side is a front side of the first bottom platform 101. Two lower uprights 103 are mounted side by side and vertically on the other side of the top surface of the first bottom platform 101, which is the rear side of the first bottom platform 101. The two high uprights 102 and the two low uprights 103 are arranged in a rectangular shape and are fixedly connected to the top surface of the first bottom platform 101 by screws. The two high columns 102 are connected by a cross beam 104, so that the two high columns 102 and the cross beam 104 form a first bracket and the two low columns 103 form a second bracket. The adjacent high upright posts 102 and the adjacent low upright posts 103 are connected through reinforcing beams 105, and the reinforcing beams 105 are parallel to each other.
As shown in fig. 1, a first elevator 8 is mounted on the upper portion of the first bracket, and the first elevator 8 is mounted between two high posts 102 through an elevator floor 12. The first elevator 8 uses a standard model KCG-500-1000kg/30m, named a multi-function elevator. The pulley device is installed on the top of the first bracket, and since the pulley device with the same structure is also used in the drop hammer assembly, the pulley device in the drop hammer assembly is defined as a first pulley device and the pulley device in the drop hammer assembly is defined as a second pulley device for the convenience of distinguishing. As shown in fig. 4, the pulley device (whether the first pulley device or the second pulley device) is composed of two bearing blocks 13, one intermediate shaft 14, one pulley 15, and two spacers 16. In this pendulum assembly, since the pulley device has been defined as the first pulley device, the bearing housing 13, the intermediate shaft 14, the pulley 15, and the spacer 16 are correspondingly defined as the first bearing housing, the first intermediate shaft, the first pulley, and the first spacer, so that the structure of the pendulum assembly will be clearly described. As shown in fig. 1, a first bearing seat (bearing seat 13) is mounted on the top of each high upright 102 in the first bracket, a first intermediate shaft (intermediate shaft 14) is rotatably connected between the two first bearing seats (bearing seats 13), and a first pulley (pulley 15) is assembled in the middle of the first intermediate shaft (intermediate shaft 14) and rotates along with the first intermediate shaft (intermediate shaft 14). The upper part of the first intermediate shaft (intermediate shaft 14) is provided with a first retaining sleeve (retaining sleeve 16) on two sides of the first pulley (pulley 15) respectively so as to prevent the first pulley (pulley 15) from shaking left and right. After passing around the first pulley (pulley 15), a first flexible rope 17 is connected at one end to the output shaft of the first elevator 8 and at the other end to the pendulum unhooking device 6. The first flexible rope is preferably a steel wire rope. As shown in fig. 1, the pendulum unhook device 6 is connected with the pendulum assembly 4 mounted on the second bracket.
As shown in fig. 5, the pendulum assembly 4 includes a support block 401, a swinging rod 402, a counterweight 403, a striker block 404, a rotating shaft 405, a transition block 406, a connection block 407, and an angle encoder. The four support blocks 401 are fixed on the tops of the two lower upright posts 103 through screws and are positioned between the two lower upright posts 103, and the four support blocks 401 are arranged in a square shape. The number of the rotating shafts 405 and the transition blocks 406 is four, and each transition block 406 is hinged with one supporting block 401 through one rotating shaft 405. Wherein, a pivot 405 is provided with the angle encoder, which is connected to a lower upright 103 and is used for measuring the swing angle of the swing lever 402. The number of the connecting blocks 407 is four, and the number of the swinging rods 402 is also four. One end of each swing rod 402 is fixedly connected with a transition block 406, and the other end is fixedly connected with a connecting block 407. The four connecting blocks 407 are respectively hinged with the balancing weights 403, and the balancing weights 403 are provided with collision blocks 404 for striking the test sample on the pendulum clamp 2. The weight 403 is located between the two lower uprights 103 and can be configured to weight according to different requirements.
As shown in fig. 7, the pendulum unhooking device 6 includes a first connection frame 601, a first cylinder 602, a first fixing frame 603, a first rotating lever 604, and a second cylinder 605. Wherein, a first connecting frame 601 is connected with the end of the first flexible rope 17, and the bottom of the cylinder barrel of the first cylinder 602 is hinged with one end of the first connecting frame 601 through a first pivot shaft 606. One end of the first fixing frame 603 is fixedly connected with the other end of the first connecting frame 601. One end of the first rotating rod 604 is hinged with a piston rod in the first cylinder 602 through a second pivot shaft 607, and the other end is hinged with the first fixing frame 603 through a third pivot shaft 608. The cylinder barrel in the second cylinder 605 is fixedly connected with the other end of the first fixing frame 603. A first locking pin 609 is connected to a piston rod in the second cylinder 605, and the first locking pin 609 cooperates with the first rotating rod 604 to control the swing of the swing rod 402.
As shown in fig. 1 and 9, the pendulum clip 2 includes a first T-shaped channel bar 201 and a first clip lock block 202 secured to the top surface of the first bottom deck 101. The first T-slot 201 extends toward the weight 403 and the striker 404. The two ends of the first T-shaped groove strip 201 are respectively provided with a first supporting block 203, and a test sample a is placed between the two first supporting blocks 203. As shown in fig. 9, a mounting plate B is connected to the front end of the test piece a, and a sensor C is mounted on the mounting plate B and is connected to a pad D that contacts the bump 404. The first clamp locking block 202 is close to the tail of the first T-shaped groove strip 201 and is used for clamping the test piece a.
As shown in fig. 1, locking devices 10 that can lock the pendulum assembly 4 are installed at both sides of the pendulum assembly 4. The locking devices 10 on both sides of the pendulum assembly 4 are identical in structure, and as shown in fig. 11, the locking device 10 includes a base body fixed on the top surface of the first bottom platform 101 and close to the weight 403, and the base body is composed of an upper frame body 1001a, a foot stand 1001b and a tail plate 1001 c. The foot stand 1001b is connected with the top surface of the first bottom platform 101 through screws, the upper stand 1001a is fixedly mounted on the foot stand 1001b, and the tail plate 1001c is mounted on one side of the upper stand 1001 a. The bottom of the cylinder barrel in the third cylinder 1002 is hinged with the tail plate 1001c, the locking top plate 1003 is hinged with the piston rod in the third cylinder 1002, and the damping plate 1004 is connected to the locking top plate 100. As shown in fig. 1, the damping plates 1004 of the two locking devices 10 are opposite to each other, and the balancing weights 403 can be clamped or loosened under the driving of the third air cylinder 1002.
The above structure is a pendulum assembly, and the drop hammer assembly will be described in detail below.
The drop hammer assembly includes a drop hammer impact support frame, shown in fig. 3, which is comprised of a second bottom platform 106 and two high posts 102. The second bottom platform 106 is connected side by side with the first bottom platform 101 and is located on the front side of the first bottom platform 101. The two high columns 102 are fixed side by side and vertically on the top surface of the second bottom platform 106, and the two high columns 102 are connected by the cross beam 104, so that the two high columns 102 on the second bottom platform 106 and the cross beam 104 therebetween form a third bracket. The first bottom platform 101, the second bottom platform 106, the first bracket, the second bracket and the third bracket together form the main body supporting structure 1 of the automobile steering component comprehensive impact test bed.
As shown in fig. 1, a second lifter 9 is installed at the upper portion of the third bracket, and the second lifter 9 is installed between two high columns 102. A second pulley arrangement is mounted on top of the third bracket 105. As shown in fig. 4, the pulley device is composed of two bearing blocks 13, an intermediate shaft 14, a pulley 15 and two gear sleeves 16. In this drop hammer assembly, since the pulley device has been defined as the second pulley device, the bearing block 13, the intermediate shaft 14, the pulley 15, and the sleeve 16 are correspondingly defined as the second bearing, the second intermediate shaft, the second pulley, and the second sleeve, so as to clearly illustrate the structure of the pendulum hammer assembly. As shown in fig. 1, a second bearing seat (bearing seat 13) is mounted on the top of each high upright 102 in the third bracket, a second intermediate shaft (intermediate shaft 14) is rotatably connected between the two second bearing seats (bearing seats 13), and a second pulley (pulley 15) is assembled in the middle of the second intermediate shaft (intermediate shaft 14) and rotates along with the second intermediate shaft (intermediate shaft 14). A second blocking sleeve (blocking sleeve 16) is arranged on each of two sides of the second pulley (pulley 15) on the second intermediate shaft (intermediate shaft 14) so as to prevent the second pulley (pulley 15) from shaking left and right. After passing around the second pulley (pulley 15), a second flexible rope 18 is connected at one end to the output shaft of the second elevator 9 and at the other end to the drop hammer unhooking device 7. The second flexible cord 18 is preferably a steel cord. As shown in fig. 1, the drop hammer unhooking device 7 is connected to a drop hammer assembly 5 mounted on a third bracket.
As shown in fig. 6 and 8, the drop hammer assembly 5 includes:
and the bottom plate 501 is fixedly connected with the top surface of the second bottom platform 106. Two fixing sleeves 507 are connected to the bottom plate 501.
A fixing plate 502 connected to the two high columns 102 in the third bracket.
A guide post 503 is vertically connected between the bottom plate 501 and the fixing plate 502. The number of the guide posts 503 is two. One end of each guide post is connected with the fixed sleeve 507, and the other end is connected with the fixed plate 502 through a fixed seat 508.
A guide plate 504 slidably mounted on the guide post 503 so as to slide along the guide post 503.
A weight plate 505 mounted on the guide plate 504, the weight of the weight plate 505 being adjustable as required.
An impact block 506, which is fixedly mounted on the guide plate 504, for striking the test piece on the drop hammer holder 3.
The drop weight unhooking device 7 is similar in structure to the pendulum unhooking device 6, and therefore the structure of the drop weight unhooking device 7 will be described with reference to fig. 7. As shown in fig. 7, the second coupling frame 701, the fourth cylinder 702, the second fixing frame 703, the second rotating rod 704, and the fifth cylinder 705 are included. Wherein the first connecting frame 701 is connected to the end of the second flexible rope 18, and the bottom of the cylinder barrel of the fourth cylinder 702 is hinged to one end of the second connecting frame 701 through a fourth pivot 706. One end of the second fixing frame 703 is fixedly connected with the other end of the second connecting frame 701. One end of the second rotating rod 704 is hinged with a piston rod in the fourth cylinder 702 through a fifth pivot shaft 707, and the other end of the second rotating rod is hinged with the second fixing frame 703 through a sixth pivot shaft 708. The cylinder barrel in the fifth cylinder 705 is fixedly connected with the other end of the second fixing frame 703. A second locking pin 709 is connected to the piston rod in the fifth cylinder 705, and the second locking pin 709 cooperates with the second rotating rod 704 to control the sliding of the guide plate 504.
As shown in fig. 1, the drop hammer clamp 3 is mounted at the lower part of the third bracket, and as shown in fig. 10, the drop hammer clamp 3 includes a second T-shaped groove bar 301 and a second clamp locking block 302 fixedly mounted on the third bracket. A clamp support 303 is fixedly arranged on the top surface of the second bottom platform 106, the clamp support 303 is positioned between the two high columns 102 in the third bracket, and the second T-shaped groove strip 301 is arranged on the clamp support 303 and extends towards the impact block 506. Two ends of the second T-shaped groove strip 301 are respectively provided with a second supporting block 304, and a test sample a is placed between the two second supporting blocks 304. The front end of the test sample A is connected with a mounting plate B, a sensor C is mounted on the mounting plate B, and a cushion block D contacted with the impact block 506 is connected to the sensor C. The second clamp locking block 302 is close to the tail of the second T-shaped groove strip 301, and is used for clamping the test piece a.
As shown in fig. 1, the drop hammer impact prevention devices 11 are mounted on the top surface of the second bottom platform 106 and located on both sides of the drop hammer clamp 3. As shown in fig. 12, the drop hammer impact preventing device 11 includes a sixth cylinder 1101, a damping block 1102, and a cylinder bracket 1103. The cylinder bracket 1103 is fixed on the top surface of the second bottom platform 106 and is close to the drop hammer clamp 3, the bottom of the cylinder barrel of the sixth cylinder 1101 is fixed on the cylinder bracket 1103, and a damping block 1102 for contacting with the guide plate 504 is connected to a piston rod in the sixth cylinder 1101.
The detection method of the comprehensive impact test bed for the automobile steering component is as follows:
1. pendulum impact test
1) The test sample piece is clamped on the pendulum clamp 2, the sensor is arranged at the position to be impacted by the test sample piece, the sensor is firmly arranged, and meanwhile, the test sample piece has enough strength. Impact location, for example: an input end of an automobile steering gear, an input end of an automobile steering column, and the like.
2) The pendulum assembly 4 is connected with the pendulum unhooking device 6 through a connecting hook.
3) The pendulum assembly 4 is lifted to an angle using a first lift 8. (the angle range is calculated according to the difference of the required impact force)
4) After a set delay time (before the test, the test can be set by upper computer software), completing a test action (generally, an upper computer sends a command to enable an actuating mechanism such as a cylinder to move, so that an automobile steering part comprehensive impact test bed stops acting), collecting and processing data generated by a sensor through a collecting board card, and drawing a curve of impact force and time;
2. drop hammer impact test
1) The test sample piece is clamped on the drop hammer clamp 3, the sensor is arranged at the position to be impacted by the test sample piece, the sensor is firmly arranged, and meanwhile, the test sample piece has enough strength. Impact location, for example: an input end of an automobile steering gear, an input end of an automobile steering column, and the like.
2) The drop hammer assembly 5 is connected with a drop hammer unhooking device 7 through a connecting hook.
3) The drop hammer assembly 5 is lifted to a certain height using a second elevator 9. (the height range is calculated according to the difference of the required impact force)
4) After a set delay time (before the test, the set delay time can be set through upper computer software) is started, a test action is completed (an upper computer sends a command to enable actuating mechanisms such as a cylinder to move, and then an automobile steering part comprehensive impact test bed stops acting), meanwhile, data generated by a sensor are collected and processed through a collection board card, and a curve of impact force and time is drawn.
The comprehensive impact test stand for the automobile steering component and the detection method thereof can be used for pendulum impact test and drop impact test. The comprehensive impact test bed for the automobile steering component utilizes free falling body movement of the pendulum assembly and the falling weight assembly to act on a test sample, and can directly perform impact load test on the test sample. Through the lift, realize remote control for the security obtains very big promotion, and through the feedback of sensor, makes drop weight lifting height and pendulum weight lifting angle more accurate, so alright convenient detection test sample's load capacity that shocks resistance, the testing result is more accurate.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (6)
1. The comprehensive impact test bed for the automobile steering component is characterized by comprising a pendulum assembly for performing a pendulum impact test and a drop hammer assembly for performing a drop hammer impact test;
the pendulum assembly comprises a pendulum impact support frame; the lower part of the front side of the pendulum impact support frame is horizontally provided with a pendulum clamp for clamping a test sample, and the rear side of the pendulum impact support frame is provided with a first pulley device and a first lifter; after the first flexible rope bypasses the first pulley device, one end of the first flexible rope is connected with an output shaft of the first lifter, and the other end of the first flexible rope is connected with the pendulum unhooking device; the pendulum unhooking device is connected with a pendulum assembly which is arranged on the front side of the pendulum impact support frame and is used for applying swing impact to a test sample on the pendulum clamp; locking devices for locking the pendulum bob assembly are arranged on two sides of the pendulum bob assembly;
the drop hammer assembly comprises a drop hammer impact supporting frame; the lower part of the drop hammer impact supporting frame is vertically provided with a drop hammer clamp for clamping a test sample piece, and the upper part of the drop hammer impact supporting frame is provided with a second pulley device and a second lifter; one end of the second flexible rope is connected with the output shaft of the second lifter after bypassing the second pulley device, and the other end of the second flexible rope is connected with the drop hammer unhooking device; the drop hammer unhooking device is connected with a drop hammer assembly which is arranged at the upper part of the drop hammer impact supporting frame and is used for applying vertical impact to the test sample piece on the drop hammer clamp; a drop hammer anti-impact device is arranged close to the drop hammer clamp;
the pendulum impact support frame comprises a first bottom platform, a first bracket and a second bracket, wherein the first bracket and the second bracket are respectively fixedly arranged at the front side and the rear side of the top surface of the first bottom platform;
the first pulley device is arranged at the top of the first bracket, and the first lifter is arranged at the upper part of the first bracket;
the pendulum assembly is mounted on the second bracket, the pendulum clamp is horizontally mounted on the top surface of the first bottom platform and positioned below the second bracket, and the locking device is mounted on the top surface of the first bottom platform and is close to the pendulum assembly;
the pendulum assembly includes:
the support block is fixedly connected with the top of the second bracket;
the swinging rod is positioned between the top of the second bracket and the top surface of the first bottom platform, one end of the swinging rod is hinged with the supporting block, and the other end of the swinging rod is hinged with the balancing weight; the balancing weight is provided with a collision block for striking the test sample piece on the pendulum bob clamp;
the angle encoder is connected with the second bracket and is used for measuring the swinging angle of the swinging rod;
the drop hammer impact supporting frame comprises a second bottom platform and a third bracket fixedly arranged on the top surface of the second bottom platform;
the second pulley device is arranged at the top of the third bracket, and the second lifter is arranged at the upper part of the third bracket;
the drop hammer assembly and the drop hammer clamp are arranged on the same side of the third bracket, and the drop hammer clamp is positioned at the lower part of the third bracket;
the drop hammer anti-impact device is arranged on the top surface of the second bottom platform and is close to the drop hammer clamp;
the drop hammer assembly includes:
the bottom plate is fixedly connected with the top surface of the second bottom platform;
a fixing plate connected to the third bracket;
the guide post is vertically connected between the bottom plate and the fixed plate;
a guide plate slidably mounted on the guide post;
a weight plate mounted on the guide plate;
and the impact block is fixedly arranged on the guide plate and is used for impacting the test sample piece on the drop hammer clamp.
2. The car steering component integrated impact test stand according to claim 1, wherein the first pulley device comprises two first bearing seats installed at the top of the first bracket, a first intermediate shaft rotatably connected between the two first bearing seats, and a first pulley assembled on the first intermediate shaft and rotated with the first intermediate shaft;
the first flexible rope is passed around the first pulley;
the pendulum unhooking device includes:
a first connection frame connected to an end of the first flexible rope;
the bottom of the cylinder barrel of the first cylinder is hinged with one end of the first connecting frame;
one end of the first fixing frame is fixedly connected with the other end of the first connecting frame;
one end of the first rotating rod is hinged with a piston rod in the first cylinder, and the other end of the first rotating rod is hinged with the first fixing frame;
the cylinder barrel of the second cylinder is fixedly connected with the other end of the first fixing frame; a piston rod in the second cylinder is connected with a first locking pin, and the first locking pin is matched with the first rotating rod to control the swing of the swing rod.
3. The automobile steering component integrated impact test stand of claim 2, wherein the pendulum clamp comprises a first T-channel bar and a first clamp lock block secured to a top surface of the first bottom platform; the two ends of the first T-shaped groove strip are respectively provided with a first supporting block, and a test sample piece is placed between the two first supporting blocks; the first clamp locking block is close to the tail of the first T-shaped groove strip and is used for clamping a test sample;
the locking devices positioned on two sides of the pendulum assembly have the same structure, and comprise a base body, a third cylinder, a locking top plate and a damping plate, wherein the base body is fixed on the top surface of the first bottom platform and is close to the balancing weight, the bottom of the cylinder barrel is hinged with the base body, the locking top plate is hinged with a piston rod in the third cylinder, and the damping plate is connected with the locking top plate; the damping plates in the two locking devices are opposite to each other, and the balancing weights can be clamped or loosened under the drive of the third air cylinder.
4. The integrated impact test stand for automotive steering components according to claim 1, wherein the second pulley device comprises two second bearings mounted on top of the third bracket, a second intermediate shaft rotatably connected between the second bearings, and a second pulley fitted on and rotated with the second intermediate shaft;
the second flexible rope is passed around the second pulley;
the drop hammer unhooking device comprises:
a second link connected to an end of the second flexible rope;
the bottom of the cylinder barrel of the fourth cylinder is hinged with one end of the second connecting frame;
one end of the second fixing frame is fixedly connected with the other end of the second connecting frame;
one end of the second rotating rod is hinged with a piston rod in the fourth cylinder, and the other end of the second rotating rod is hinged with a second fixing frame;
the cylinder barrel of the fifth cylinder is fixedly connected with the other end of the second fixing frame; and a piston rod in the fifth cylinder is connected with a second locking pin, and the second locking pin is matched with the second rotating rod to control the sliding of the guide plate.
5. The integrated impact test stand for automotive steering components of claim 4, wherein the drop hammer clamp comprises a second T-shaped channel bar and a second clamp lock block fixedly mounted on the third bracket; two ends of the second T-shaped groove strip are respectively provided with a second supporting block, and a test sample piece is placed between the two second supporting blocks; the second clamp locking block is close to the tail of the second T-shaped groove strip and is used for clamping the test sample;
the drop hammer anti-impact device comprises a sixth air cylinder, the bottom of the cylinder barrel is fixed on the top surface of the second bottom platform and is close to the drop hammer clamp, and a damping block used for being in contact with the guide plate is connected to a piston rod in the sixth air cylinder.
6. The automobile steering component integrated impact test bed according to claim 1, wherein the detection method comprises the following steps:
1. pendulum impact test
1) Clamping a test sample piece on a pendulum clamp, and installing a sensor at the position of the test sample piece to be impacted;
2) The pendulum bob component is connected with a pendulum bob unhooking device through a connecting hook;
3) Lifting the pendulum assembly to an angle using a first lift;
4) Starting the test, completing the test action after the test is performed for a set delay time, collecting and processing data generated by the sensor through the collecting board card, and drawing a curve of impact force and time;
2. drop hammer impact test
1) Clamping a test sample piece on a drop hammer clamp, and mounting a sensor at the position of the test sample piece to be impacted;
2) The drop hammer assembly is connected with a drop hammer unhooking device through a connecting hook;
3) Lifting the drop hammer assembly to a certain height by using a second lifter;
4) And (3) starting the test, completing the test action after the test is performed for a set delay time, collecting and processing data generated by the sensor through the collecting board card, and drawing a curve of impact force and time.
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| CN201711275456.9A CN107817119B (en) | 2017-12-06 | 2017-12-06 | Comprehensive impact test bed for automobile steering component and detection method thereof |
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| CN201711275456.9A CN107817119B (en) | 2017-12-06 | 2017-12-06 | Comprehensive impact test bed for automobile steering component and detection method thereof |
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| CN107817119A CN107817119A (en) | 2018-03-20 |
| CN107817119B true CN107817119B (en) | 2024-02-02 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020094663A (en) * | 2001-06-12 | 2002-12-18 | 현대자동차주식회사 | Falling dart impact tester for automobile lower arm |
| JP2008224632A (en) * | 2007-03-16 | 2008-09-25 | Jfe Steel Kk | Method for measuring impact absorption energy using dropping weight type impact testing machine, and dropping weight type impact testing machine |
| CN102519699A (en) * | 2011-12-12 | 2012-06-27 | 中联重科股份有限公司 | Falling object impact test device and cab comprehensive test system |
| DE102011011018B3 (en) * | 2011-02-11 | 2012-07-26 | Industrieanlagen-Betriebsgesellschaft Mbh | Pendulum drop system for impacting testing object, particularly motor vehicle component with testing load, comprises guide structure, which is arranged for guiding falling object during drop along guide structure |
| CN103728112A (en) * | 2013-12-04 | 2014-04-16 | 大连洁能重工机械有限公司 | Impact testing stand |
| CN204594652U (en) * | 2015-04-18 | 2015-08-26 | 长春机械科学研究院有限公司 | A kind of truck drive shaft is turned round to shock table |
| CN207528463U (en) * | 2017-12-06 | 2018-06-22 | 山东凯帝斯工业***有限公司 | Motor turning component compressive stroke testing stand |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY136233A (en) * | 2002-11-18 | 2008-08-29 | Univ Putra Malaysia | Pendulum impact test rig |
-
2017
- 2017-12-06 CN CN201711275456.9A patent/CN107817119B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020094663A (en) * | 2001-06-12 | 2002-12-18 | 현대자동차주식회사 | Falling dart impact tester for automobile lower arm |
| JP2008224632A (en) * | 2007-03-16 | 2008-09-25 | Jfe Steel Kk | Method for measuring impact absorption energy using dropping weight type impact testing machine, and dropping weight type impact testing machine |
| DE102011011018B3 (en) * | 2011-02-11 | 2012-07-26 | Industrieanlagen-Betriebsgesellschaft Mbh | Pendulum drop system for impacting testing object, particularly motor vehicle component with testing load, comprises guide structure, which is arranged for guiding falling object during drop along guide structure |
| CN102519699A (en) * | 2011-12-12 | 2012-06-27 | 中联重科股份有限公司 | Falling object impact test device and cab comprehensive test system |
| CN103728112A (en) * | 2013-12-04 | 2014-04-16 | 大连洁能重工机械有限公司 | Impact testing stand |
| CN204594652U (en) * | 2015-04-18 | 2015-08-26 | 长春机械科学研究院有限公司 | A kind of truck drive shaft is turned round to shock table |
| CN207528463U (en) * | 2017-12-06 | 2018-06-22 | 山东凯帝斯工业***有限公司 | Motor turning component compressive stroke testing stand |
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