CN218411640U - Inverted front shock absorber damping force detection device - Google Patents
Inverted front shock absorber damping force detection device Download PDFInfo
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- CN218411640U CN218411640U CN202221975622.2U CN202221975622U CN218411640U CN 218411640 U CN218411640 U CN 218411640U CN 202221975622 U CN202221975622 U CN 202221975622U CN 218411640 U CN218411640 U CN 218411640U
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- shock absorber
- fixedly connected
- damping force
- front shock
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Abstract
The utility model provides an inversion type front shock absorber damping force detection device, relates to the shock absorber and detects technical field, includes: the top of the rack is horizontally and fixedly provided with an installation plate, and the middle part of the rack is horizontally and fixedly provided with a support table; the testing mechanism comprises a driving part, a lifting part and a plurality of testing stations, wherein the driving part is fixedly arranged on the mounting plate, the lifting part is vertically and slidably arranged on the rack, the lifting part is connected with the power output end of the driving part, and the plurality of testing stations are arranged between the lifting part and the supporting table; and the adjusting mechanism comprises a plurality of adjusting pieces, the adjusting pieces are connected with the plurality of testing stations in a one-to-one correspondence mode after penetrating through the supporting table, and each adjusting piece is used for changing the testing stroke of the corresponding testing station.
Description
Technical Field
The utility model relates to a bumper shock absorber detects technical field, concretely relates to inversion type front shock absorber damping force detection device.
Background
The shock absorber is a necessary device of a motor vehicle, and the working principle of the shock absorber is that when the relative motion occurs in the shock between a vehicle body and a vehicle axle, a piston in the shock absorber moves up and down, and shock absorption oil in a shock absorber working cylinder repeatedly flows into another cavity from one cavity through different pores. At the moment, the friction between the hole wall and the shock absorption oil and the internal friction between oil molecules form damping force on the shock, so that the shock energy of the automobile is converted into the heat energy of the shock absorption oil and then absorbed by the shock absorber and dissipated into the atmosphere.
The damping force is an important standard for measuring the damping effect of the shock absorber, and therefore after the shock absorber is produced, the damping force of the shock absorber needs to be detected, for an inverted front shock absorber, as shown in fig. 1, the inverted front shock absorber comprises an outer cylinder 9 and an inner cylinder 91, the inner cylinder 91 is slidably and elastically inserted between the inner side and the outer side of the outer cylinder 9, and one end of the inner cylinder 91, which is far away from the outer cylinder 9, is provided with a positioning hole 92.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists among the prior art, the utility model provides an inversion formula front shock absorber damping force detection device, it has solved the detection device detection efficiency who exists among the prior art and has hanged down, detects the problem that data is not accurate enough.
An inverted front shock absorber damping force detection apparatus comprising:
the device comprises a rack, a support platform and a lifting mechanism, wherein the top of the rack is horizontally and fixedly provided with an installation plate, and the middle part of the rack is horizontally and fixedly provided with the support platform;
the testing mechanism comprises a driving part, a lifting part and a plurality of testing stations, wherein the driving part is fixedly arranged on the mounting plate, the lifting part is vertically and slidably arranged on the rack, the lifting part is connected with the power output end of the driving part, and the plurality of testing stations are arranged between the lifting part and the supporting table;
and the adjusting mechanism comprises a plurality of adjusting pieces, the adjusting pieces are connected with the plurality of testing stations in a one-to-one correspondence mode after penetrating through the supporting table, and each adjusting piece is used for changing the testing stroke of the corresponding testing station.
Compared with the prior art, the utility model discloses following beneficial effect has: when the device is used, the inverted front shock absorber is placed in a corresponding test station, then the driving part is started to drive the lifting part to move downwards in the vertical direction so as to clamp and fix the outer cylinder and the inner cylinder of the inverted front shock absorber, then the test station simulates the working condition of the inverted front shock absorber so as to enable the outer cylinder and the inner cylinder to move relatively, the test station is used for measuring detection data, then the damping force of the inverted front shock absorber is calculated, in order to ensure the accuracy of the detection data, the test stroke of the corresponding test station can be adjusted through the adjusting part so as to change the working condition of the inverted front shock absorber, and therefore the damping forces under different working conditions are measured; the device is simple and convenient to operate, the damping force of the inverted front shock absorber can be rapidly, efficiently and accurately measured, multiple stations can be simultaneously detected, and the detection efficiency is improved.
Preferably, each test station all includes anchor clamps, lower anchor clamps, pressure sensor and displacement sensor, pressure sensor fixed connection is between last anchor clamps and lift portion, anchor clamps link to each other with the regulating part that corresponds down, goes up anchor clamps and lower anchor clamps and arranges in opposite directions, displacement sensor sets up between lift portion and a supporting bench, each the regulating part all passes behind the supporting bench and corresponds the fixed linking to each other of lower anchor clamps.
Preferably, vertical parallel fixed mounting has two first guide arms between mounting panel and the brace table, lifting unit includes mount and a plurality of pressure piece, two sliding sleeves, two are worn to be equipped with by vertical fixed on the mount sliding sleeve one-to-one overlaps and is established on two first guide arms, and mount upper portion fixed mounting has the fixed block, the power take off end and the fixed block of drive division are fixed to be continuous, and a plurality of pressure pieces are fixed to run through mount and one-to-one and a plurality of test station's pressure sensor and displacement sensor are fixed to be continuous.
Preferably, each pressure spare all includes telescopic cylinder, connecting plate, connecting block and second guide arm, telescopic cylinder's the fixed mount that runs through of connecting end, telescopic cylinder's flexible end arrange downwards and with the connecting plate is fixed continuous, connecting block fixed mounting is in connecting plate one side, second guide arm one end is fixed continuous with the mount lower part, the other end freely runs through the connecting plate, pressure sensor and connecting plate bottom are fixed continuous, displacement sensor and connecting plate lateral wall are fixed continuous.
Preferably, the driving part comprises a worm gear lead screw lifter fixedly installed on the installation plate, and the lifting end of the worm gear lead screw lifter is fixedly connected with the fixed block through a connecting flange.
Preferably, each adjusting part comprises a motor, a speed reducer and an electric cylinder, a power output shaft of the motor is coaxially and fixedly connected with a power input shaft of the speed reducer, the power output shaft of the speed reducer is coaxially and fixedly connected with a power input shaft of the electric cylinder, and a power output shaft of the electric cylinder penetrates through the support table and then is fixedly connected with the corresponding lower clamp.
Preferably, the upper clamp comprises a positioning cylinder, a cylinder opening of the positioning cylinder is vertically arranged downwards, and a cylinder bottom of the positioning cylinder is fixedly connected with the pressure sensor.
Preferably, the lower clamp comprises a positioning seat, the positioning seat is fixedly connected with a power output shaft of the electric cylinder, a through groove is horizontally formed in the upper portion of the positioning seat, and a positioning pin penetrates through the inner side and the outer side of the through groove in a sliding mode along the direction perpendicular to the forming direction of the through groove.
Preferably, still include control box and worker's accuse cabinet, the control box passes through the cantilever and links to each other with the frame is fixed, worker's accuse cabinet sets up frame one side, the control box is used for controlling worm wheel lead screw lift, telescopic cylinder, motor, speed reducer and electric cylinder, worker's accuse cabinet is used for receiving the signal of pressure sensor and displacement sensor transmission.
Preferably, still include the electronic box, electronic box fixed mounting is in the frame, and electronic box and control box, industrial control cabinet, worm wheel lead screw lift, motor, speed reducer and electric jar all electricity are connected.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural view of an inverted front shock absorber.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a front view of fig. 2.
Fig. 4 is a schematic structural view of the lower clamp in fig. 3.
The numbers in the figures are in order: 1. a frame; 11. mounting a plate; 12. a support table; 13. an electric box; 14. a foot cup; 2. a worm screw hoist; 21. a connecting flange; 3. a first guide bar; 4. a fixed mount; 41. a fixed block; 42. a sliding sleeve; 5. a telescopic cylinder; 51. a connecting plate; 52. a pressure sensor; 53. connecting blocks; 54. a second guide bar; 55. a positioning cylinder; 56. a displacement sensor; 6. a motor; 61. a speed reducer; 62. an electric cylinder; 63. positioning seats; 64. a through groove; 65. positioning pins; 7. a control box; 71. a cantilever; 8. a work control cabinet; 9. an outer cylinder; 91. an inner barrel; 92. and (7) positioning the holes.
Detailed Description
In order to make the utility model discloses technical means, creation characteristic, achievement purpose and effect that realize are clearer and easily understand, and it is right to combine below attached drawing and detailed implementation mode the utility model discloses do further to explain:
as shown in fig. 2-3, an embodiment of the present invention provides an inverted front shock absorber damping force detection device, including: the device comprises a rack 1, a support platform 12 and a mounting plate 11, wherein the top of the rack 1 is horizontally and fixedly provided with the mounting plate, and the middle part of the rack 1 is horizontally and fixedly provided with the support platform; the testing mechanism comprises a driving part, a lifting part and a plurality of testing stations, wherein the driving part is fixedly arranged on the mounting plate 11, the lifting part is vertically and slidably arranged on the rack 1, the lifting part is connected with a power output end of the driving part, and the plurality of testing stations are arranged between the lifting part and the supporting table 12; the adjusting mechanism comprises a plurality of adjusting pieces, the adjusting pieces penetrate through the supporting table 12 and are connected with the testing stations in a one-to-one correspondence mode, and each adjusting piece is used for changing the testing stroke of the corresponding testing station; and preferably, a plurality of foot cups 14 are fixedly arranged at the bottom of the machine frame 1 along the circumferential direction.
When the testing device is used, the inverted front shock absorber is placed in a corresponding testing station, then the driving part is started to drive the lifting part to move in the vertical direction so as to clamp and fix the outer cylinder 9 and the inner cylinder 91 of the inverted front shock absorber, then the testing station simulates working conditions of the inverted front shock absorber, so that the outer cylinder 9 and the inner cylinder 91 of the inverted front shock absorber generate relative movement, the testing station is used for measuring detection data, then the damping force of the inverted front shock absorber is calculated, and in order to ensure the accuracy of the detection data, the testing stroke of the corresponding testing station can be adjusted through the adjusting part so as to change the working conditions of the inverted front shock absorber, and thus the damping forces under different working conditions are measured; the operation is simple and convenient, the damping force of the inverted front shock absorber can be rapidly, efficiently and accurately measured, and the multi-station detection can be simultaneously carried out, so that the detection efficiency is improved.
As shown in fig. 1-3, according to the utility model discloses a further embodiment, an inversion formula front shock absorber damping force detection device, further optimize the test station that it includes, preferably, each the test station all includes anchor clamps, lower anchor clamps, pressure sensor 52 and displacement sensor 56, pressure sensor 52 fixed connection is between last anchor clamps and lift portion, lower anchor clamps link to each other with the regulating part that corresponds, goes up anchor clamps and arranges with lower anchor clamps in opposite directions, displacement sensor 56 sets up between lift portion and supporting bench 12, each the regulating part all passes behind supporting bench 12 and is fixed continuous with corresponding lower anchor clamps.
When the inverted front shock absorber is installed, the free end of the inner cylinder 91 of the inverted front shock absorber is clamped and fixed through the lower clamp, and then the lifting part is started to drive the upper clamp to move downwards until the free end of the outer cylinder 9 of the inverted front shock absorber abuts against and is clamped and fixed.
As shown in fig. 2-3, according to another embodiment of the present invention, the inverted front damper damping force detection device further optimizes the lifting portion and the driving portion included therein, two first guide rods 3 are vertically and fixedly installed between the mounting plate 11 and the supporting table 12 in parallel, the lifting portion includes a fixing frame 4 and a plurality of pressure members, two sliding sleeves 42 are vertically and fixedly penetrated on the fixing frame 4, the two sliding sleeves 42 are slidably sleeved on the two first guide rods 3 in a one-to-one correspondence manner, a fixing block 41 is fixedly installed on the upper portion of the fixing frame 4, the power output end of the driving portion is fixedly connected with the fixing block 41, and the plurality of pressure members fixedly penetrate through the fixing frame 4 and are fixedly connected with the pressure sensors 52 and the displacement sensors 56 of the plurality of test stations in a one-to-one correspondence manner; each pressure member all includes telescopic cylinder 5, connecting plate 51, connecting block 53 and second guide arm 54, the fixed mount 4 that runs through is fixed to telescopic cylinder 5's connecting end, and telescopic cylinder 5's flexible end arranges downwards and links to each other with connecting plate 51 is fixed, connecting block 53 fixed mounting is in connecting plate 51 one side, second guide arm 54 one end links to each other with fixed mount 4 lower part is fixed, and the other end freely runs through connecting plate 51, pressure sensor 52 links to each other with connecting plate 51 bottom is fixed, displacement sensor 56 links to each other with connecting plate 51 lateral wall is fixed.
The driving part comprises a worm gear lead screw lifter 2 fixedly installed on the installation plate 11, and the lifting end of the worm gear lead screw lifter 2 is fixedly connected with the fixed block 41 through a connecting flange 21.
During detection, the free end of the inverted front shock absorber inner cylinder 91 is clamped and fixed by the lower clamp, then the worm screw elevator 2 is started to drive the fixing frame 4 to move in the vertical direction through the fixing block 41, meanwhile, the two sliding sleeves 42 slide along the first guide rod 3, the fixing frame 4 drives the telescopic cylinder 5, the connecting plate 51, the pressure sensor 52 and the upper clamp to move downwards in the vertical direction until the upper clamp abuts against and is clamped and fixed with the free end of the inverted front shock absorber outer cylinder 9, then the telescopic cylinder 5 is started to drive the upper clamp to reciprocate in the vertical direction, the inverted front shock absorber outer cylinder 9 and the inverted front shock absorber inner cylinder 91 move relatively in the movement process, the pressure sensor 52 records the pressure condition applied to the pressure sensor 9, the displacement sensor 56 records the displacement distance of the connecting plate 51, and the damping force of the inverted front shock absorber is calculated through data recorded by the pressure sensor 52 and the displacement sensor 56, wherein the calculation method for the damping force is the prior art, and the outer cylinder is not described in detail herein.
As shown in fig. 2-3, according to another embodiment of the present invention, the damping force detecting device for an inverted front shock absorber further optimizes the adjusting members included therein, each of the adjusting members includes a motor 6, a speed reducer 61 and an electric cylinder 62, the power output shaft of the motor 6 is coaxially and fixedly connected to the power input shaft of the speed reducer 61, the power output shaft of the speed reducer 61 is coaxially and fixedly connected to the power input shaft of the electric cylinder 62, and the power output shaft of the electric cylinder 62 is fixedly connected to the corresponding lower clamp after passing through the supporting table 12; the electric cylinder 62 can convert the rotation motion transmitted by deceleration into linear motion to drive the lower clamp to move in the vertical direction, so that the distance between the lower clamp and the upper clamp is changed, namely, the test stroke between the outer cylinder 9 and the inner cylinder 91 of the inverted front shock absorber is changed.
As shown in fig. 1 to 4, according to another embodiment of the present invention, the inverted front shock absorber damping force detecting device further comprises an upper fixture and a lower fixture, wherein the upper fixture comprises a positioning cylinder 55, a cylinder opening of the positioning cylinder 55 is arranged vertically downward, and a cylinder bottom of the positioning cylinder 55 is fixedly connected to the pressure sensor 52; the lower clamp comprises a positioning seat 63, the positioning seat 63 is fixedly connected with a power output shaft of the electric cylinder 62, a through groove 64 is horizontally formed in the upper portion of the positioning seat 63, and a positioning pin 65 is slidably arranged between the inner side and the outer side of the through groove 64 in a direction perpendicular to the forming direction of the through groove; when the inverted front shock absorber is installed, the free end of the inner cylinder 91 penetrates into the through groove 64 of the positioning seat 63, the positioning pin 65 penetrates into the positioning hole 92 for fixing, then the worm screw rod lifter 2 is started to drive the fixing frame 4 to move downwards through the fixing block 41, and the positioning cylinder 55 is driven to move downwards, so that the free end of the outer cylinder 9 of the inverted front shock absorber is inserted into the positioning cylinder 55, and the installation of the inverted front shock absorber is completed.
As shown in fig. 2, according to another embodiment of the present invention, the inverted front shock absorber damping force detecting device preferably further includes a control box 7 and an industrial control cabinet 8, the control box 7 is fixedly connected to the frame 1 through a cantilever 71, the industrial control cabinet 8 is disposed on one side of the frame 1, the control box 7 is used for controlling the worm screw elevator 2, the telescopic cylinder 5, the motor 6, the speed reducer 61 and the electric cylinder 62, and the industrial control cabinet 8 is used for receiving signals transmitted by the pressure sensor 52 and the displacement sensor 56; the electric box 13 is fixedly arranged on the rack 1, and the electric box 13 is electrically connected with the control box 7, the industrial control cabinet 8, the worm gear lead screw lifter 2, the motor 6, the speed reducer 61 and the electric cylinder 62; thereby completing the power supply of the device and the signal transmission, wherein the related program control and signal transmission technologies are all the prior art and are not described in detail here.
The utility model discloses an application principle does: the utility model discloses during the use, penetrate the logical groove 64 of positioning seat 63 with the free end of inversion type front damper inner tube 91 earlier, and penetrate locating pin 65 and fix in the locating hole 92, start worm screw rod lift 2 and drive mount 4 downstream through fixed block 41 afterwards, drive location section of thick bamboo 55 downstream, thereby make the free end of inversion type front damper's urceolus 9 insert in the location section of thick bamboo 55, in order to accomplish inversion type front damper's installation, it drives anchor clamps at vertical direction reciprocating motion to start telescopic cylinder 5 afterwards, relative motion takes place for inversion type front damper's urceolus 9 and inner tube 91 in the motion process, pressure sensor 52 records urceolus 9 to its applied pressure condition, displacement sensor 56 records connecting plate 51's displacement distance, the data transmission of pressure sensor 52 and displacement sensor 56 record is to industrial control cabinet 8 and show, calculate the damping force of inversion type front damper according to data afterwards.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (10)
1. An inverted front shock absorber damping force detection device, comprising:
the device comprises a rack (1), wherein a mounting plate (11) is horizontally and fixedly mounted at the top of the rack (1), and a supporting table (12) is horizontally and fixedly mounted in the middle of the rack (1);
the testing mechanism comprises a driving part, a lifting part and a plurality of testing stations, the driving part is fixedly mounted on the mounting plate (11), the lifting part is vertically and slidably arranged on the rack (1), the lifting part is connected with a power output end of the driving part, and the testing stations are arranged between the lifting part and the supporting table (12);
the adjusting mechanism comprises a plurality of adjusting pieces, the adjusting pieces penetrate through the supporting table (12) and then are connected with the testing stations in a one-to-one correspondence mode, and each adjusting piece is used for changing the testing stroke of the corresponding testing station.
2. The device for detecting the damping force of the inverted front shock absorber according to claim 1, wherein each testing station comprises an upper clamp, a lower clamp, a pressure sensor (52) and a displacement sensor (56), the pressure sensor (52) is fixedly connected between the upper clamp and the lifting portion, the lower clamp is connected with a corresponding adjusting member, the upper clamp and the lower clamp are oppositely arranged, the displacement sensor (56) is arranged between the lifting portion and the supporting platform (12), and each adjusting member passes through the supporting platform (12) and then is fixedly connected with the corresponding lower clamp.
3. The inverted front shock absorber damping force detection device according to claim 2, wherein two first guide rods (3) are vertically and fixedly installed in parallel between the mounting plate (11) and the support table (12), the lifting portion comprises a fixing frame (4) and a plurality of pressure pieces, two sliding sleeves (42) are vertically and fixedly arranged on the fixing frame (4) in a penetrating mode, the two sliding sleeves (42) are sleeved on the two first guide rods (3) in a one-to-one corresponding mode, a fixing block (41) is fixedly installed on the upper portion of the fixing frame (4), the power output end of the driving portion is fixedly connected with the fixing block (41), and the pressure pieces fixedly penetrate through the fixing frame (4) and are fixedly connected with the pressure sensors (52) and the displacement sensors (56) of the plurality of test stations in a one-to-one correspondence mode.
4. The device for detecting the damping force of the inverted front shock absorber according to claim 3, wherein each pressure member comprises a telescopic cylinder (5), a connecting plate (51), a connecting block (53) and a second guide rod (54), the connecting end of the telescopic cylinder (5) fixedly penetrates through the fixed frame (4), the telescopic end of the telescopic cylinder (5) is arranged downwards and fixedly connected with the connecting plate (51), the connecting block (53) is fixedly installed on one side of the connecting plate (51), one end of the second guide rod (54) is fixedly connected with the lower portion of the fixed frame (4), the other end of the second guide rod freely penetrates through the connecting plate (51), the pressure sensor (52) is fixedly connected with the bottom of the connecting plate (51), and the displacement sensor (56) is fixedly connected with the side wall of the connecting plate (51).
5. The inverted front shock absorber damping force detection device according to claim 3, wherein the driving part comprises a worm screw lifter (2) fixedly mounted on the mounting plate (11), and a lifting end of the worm screw lifter (2) is fixedly connected with the fixed block (41) through a connecting flange (21).
6. The device for detecting the damping force of the inverted front shock absorber according to claim 5, wherein each adjusting member comprises a motor (6), a speed reducer (61) and an electric cylinder (62), a power output shaft of the motor (6) is coaxially and fixedly connected with a power input shaft of the speed reducer (61), a power output shaft of the speed reducer (61) is coaxially and fixedly connected with a power input shaft of the electric cylinder (62), and a power output shaft of the electric cylinder (62) penetrates through the support table (12) and then is fixedly connected with the corresponding lower clamp.
7. The inverted front shock absorber damping force detection device according to claim 6, wherein the upper clamp comprises a positioning cylinder (55), a cylinder opening of the positioning cylinder (55) is arranged vertically downwards, and a cylinder bottom of the positioning cylinder (55) is fixedly connected with the pressure sensor (52).
8. The device for detecting the damping force of the inverted front shock absorber according to claim 7, wherein the lower fixture comprises a positioning seat (63), the positioning seat (63) is fixedly connected with a power output shaft of the electric cylinder (62), a through groove (64) is horizontally formed in the upper portion of the positioning seat (63), and a positioning pin (65) is slidably inserted between the inner side and the outer side of the through groove (64) along a direction perpendicular to the forming direction of the through groove.
9. The inverted front shock absorber damping force detection device according to claim 6, further comprising a control box (7) and a work control cabinet (8), wherein the control box (7) is fixedly connected with the rack (1) through a cantilever (71), the work control cabinet (8) is arranged on one side of the rack (1), the control box (7) is used for controlling the worm-screw elevator (2), the telescopic cylinder (5), the motor (6), the speed reducer (61) and the electric cylinder (62), and the work control cabinet (8) is used for receiving signals transmitted by the pressure sensor (52) and the displacement sensor (56).
10. The device for detecting the damping force of the inverted front shock absorber according to claim 9, further comprising an electric box (13), wherein the electric box (13) is fixedly mounted on the frame (1), and the electric box (13) is electrically connected with the control box (7), the industrial control cabinet (8), the worm screw elevator (2), the motor (6), the speed reducer (61) and the electric cylinder (62).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221975622.2U CN218411640U (en) | 2022-07-29 | 2022-07-29 | Inverted front shock absorber damping force detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221975622.2U CN218411640U (en) | 2022-07-29 | 2022-07-29 | Inverted front shock absorber damping force detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664491A (en) * | 2024-02-02 | 2024-03-08 | 泸州市一圣鸿包装有限公司 | Intelligent detection device and method for simulated transportation vibration of corrugated case |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664491A (en) * | 2024-02-02 | 2024-03-08 | 泸州市一圣鸿包装有限公司 | Intelligent detection device and method for simulated transportation vibration of corrugated case |
| CN117664491B (en) * | 2024-02-02 | 2024-04-23 | 泸州市一圣鸿包装有限公司 | Intelligent detection device and method for simulated transportation vibration of corrugated case |
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