CN212646325U - Compressive strength test device system with overload protection function - Google Patents
Compressive strength test device system with overload protection function Download PDFInfo
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- CN212646325U CN212646325U CN202021571785.5U CN202021571785U CN212646325U CN 212646325 U CN212646325 U CN 212646325U CN 202021571785 U CN202021571785 U CN 202021571785U CN 212646325 U CN212646325 U CN 212646325U
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Abstract
The utility model belongs to the technical field of static or dynamic balance test systems of machines or structural components, and discloses a compressive strength test device system with overload protection function, which comprises an installation disc I, a crumpling mechanism, a data acquisition assembly and a dummy head type, wherein the crumpling mechanism comprises a support rod provided with a slotted hole and a crumpling rod vertically and slidably connected in the slotted hole, the support rod is fixed on the installation disc I, a strip-shaped hole communicated with the slotted hole is arranged on the support rod, a pressure plate is connected on the crumpling rod through a bolt, and the pressure plate is tightly attached to one side of the support rod provided with the strip-shaped hole; the data acquisition assembly comprises a sleeve fixed at the top of the collapsing rod and a triaxial force sensor fixed at the top of the sleeve; the dummy head type assembly comprises a mounting disc II fixed at the top of the triaxial force sensor and a dummy head type fixed on the mounting disc II; the test device also comprises a jacking device for providing test pressure. The utility model discloses when can realizing the roof pressurized, monitor the institute's head institute pressure.
Description
Technical Field
The utility model belongs to the technical field of machine or structural component's quiet or dynamic balance test system, concretely relates to compressive strength test device system with overload protection function.
Background
When a consumer purchases a car, the factors of the car are brand, appearance, price, safety performance and the like. The safety performance of an automobile is mainly divided into active safety and passive safety, and the passive safety refers to the capability of protecting drivers and passengers and reducing damages in the process of accidents of the automobile and is an insurmountable bottom line.
The passive safety performance of the automobile is guaranteed through a good automobile body structure and strength, wherein the compressive strength of the roof is an important index for detecting the passive safety performance of the automobile. And the vehicle type insurance safety classification is also used as the most important factor of vehicle type pricing, so the Chinese insurance automobile safety index (C-IASI) also brings a roof compressive strength test into a test evaluation system of the vehicle type insurance safety classification.
However, the current multi-national standards including roof compression strength test rules in the safety index of the Chinese insurance automobile are still to be perfected, and obviously, a measure for collecting the pressure on the head of a driver is lacked. With the improvement of the test and evaluation rules, the indexes are also considered, and no related test device in China has the capability of monitoring the pressure on the head of the dummy at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a compressive strength test device system with overload protection function to when realizing the roof pressurized, the pressure that dummy head received monitors.
In order to achieve the purpose, the utility model provides the following technical scheme, a compressive strength test device system with overload protection function, which comprises an installation disc I, a collapsing mechanism, a data acquisition assembly and a dummy head type assembly which are sequentially arranged from bottom to top, wherein the collapsing mechanism comprises a support rod provided with a slotted hole and a collapsing rod vertically and slidably connected in the slotted hole, the support rod is fixed on the installation disc I, the support rod is provided with a strip-shaped hole communicated with the slotted hole, the collapsing rod is connected with a pressing plate through a bolt, and the pressing plate is tightly attached to one side of the support rod provided with the strip-shaped hole; the data acquisition assembly comprises a sleeve fixed at the top of the collapsing rod and a triaxial force sensor fixed at the top of the sleeve; the dummy head type assembly comprises a mounting disc II fixed at the top of the triaxial force sensor and a dummy head type fixed on the mounting disc II; the test device also comprises a jacking device for providing test pressure.
The technical principle of the technical scheme is as follows:
the mounting disc is fixed in the vehicle body, the roof pressing device is used for providing pressure for the vehicle roof, and after the vehicle roof is pressed and dented, the dummy head shape is pressed, so that the dummy head shape is pressed. In the process, the pressure can be acquired through the triaxial force sensor positioned between the dummy head and the sleeve, and the test of the compressive strength of the roof is realized. In the test process, the dummy head is pressed and can downwards extrude the collapse rod, and after the force applied to the collapse rod overcomes the friction force between the pressing plate and the supporting rod, the collapse rod downwards slides, so that the dummy head is protected, and the probability of the broken dummy head is reduced. Compared with the method that the triaxial force sensor is directly installed on the vehicle roof, the method can utilize the vehicle roof to slow down a part of force and then act on the dummy head type and the triaxial force sensor, can avoid the direct action of pressure on the triaxial force sensor, and further has a protection effect on the triaxial force sensor.
The beneficial effects of the technical scheme are as follows:
1. the device system provided by the technical scheme can complete the compression strength test of the car roof, the top pressure equipment is used for providing pressure to extrude the dummy head shape, so that the dummy head shape is pressed, and the triaxial force sensor below the dummy head shape can collect the stress of the dummy head shape, so that the test for detecting the compression strength of the car roof is completed;
2. the collapse rod is connected with the support rod in a vertical sliding mode, the compression plate is tightly attached to the support rod, and the overload protection function can be achieved, namely when the stress on the dummy head is large, the force for extruding the collapse rod is larger than the friction force between the compression plate and the support plate, so that the collapse rod moves downwards, the collapse rod and the dummy head are protected, and the probability of breakage of the dummy head and the collapse rod is reduced;
3. through bolted connection between the clamping plate and the collapse rod, the degree of hugging closely between clamping plate and the bracing piece can be adjusted through twisting the collapse rod, thereby adjusting overload protection intensity, and the operation is very convenient.
Furthermore, the side that the bracing piece is equipped with the bar hole is equipped with first sawtooth, and the clamp plate is close to one side of bracing piece and is equipped with the second sawtooth with first sawtooth complex.
Has the advantages that: through the setting of first sawtooth and second sawtooth, can adjust the area of contact between holddown plate and the bracing piece, and the size of frictional force is decided through coefficient of friction, packing force and area of contact, consequently sets up first sawtooth and second sawtooth and can adjust the area of contact between holddown plate and the bracing piece to adjust overload protection's limit value.
Furthermore, an adjustable cross platform is arranged between the mounting disc I and the collapsing mechanism, the adjustable cross platform comprises a mounting base, a cross sliding block and a horizontal groove platform which are sequentially arranged from bottom to top, and the mounting base is fixed on the mounting disc I; base fixing blocks are fixed at two ends of the mounting base, a threaded guide rail I is rotatably connected between the two base fixing blocks, the threaded guide rail I penetrates through the crosshead shoe and one of the base fixing blocks, and the threaded guide rail I is in threaded connection with the crosshead shoe; the both ends of horizontal groove platform bottom surface all are fixed with the spout and connect the platform, rotate between two spout connection platforms to be connected with screw thread guide rail II, and screw thread guide rail II runs through crosshead shoe and one of them spout connection platform, and screw thread guide rail II also with crosshead shoe threaded connection, and screw thread guide rail II sets up with screw thread guide rail I is perpendicular.
Has the advantages that: the adjustable cross platform is arranged, so that the positions of the head of the dummy can be adjusted in the X direction and the Y direction, and the test of each angle and position can be realized. Threaded connection between screw thread guide I and screw thread guide II and the crosshead shoe, consequently when rotating screw thread guide I or screw thread guide II, can realize that crosshead shoe and screw thread guide I or screw thread guide II take place its axial relative movement, and then adjust the position of dummy head type.
Further, smooth guide rail I parallel with screw thread guide rail I is still fixed with between two base fixed blocks, and smooth guide rail I runs through the crosshead shoe, and smooth guide rail I is along its axial sliding connection on the crosshead shoe.
Has the advantages that: set up smooth guide rail I and can carry on spacingly to the crosshead shoe for the crosshead shoe can not take place to rotate along with screw thread guide rail I, consequently when rotating screw thread guide rail I, need not hand crosshead shoe, just can realize the crosshead shoe and take place to slide along the axial of screw thread guide rail I, thereby carries out the regulation of position. And smooth guide rail I can also play the effect of direction.
Furthermore, be fixed with smooth guide rail II parallel with II threaded guide rails between two spout connection platforms, smooth guide rail II runs through the crosshead shoe, and smooth guide rail II along its axial sliding connection on the crosshead shoe.
Has the advantages that: the smooth guide rail II has the functions of limiting and guiding the crosshead shoe, so that the crosshead shoe, the threaded guide rail II and the smooth guide rail II move relatively along the axial direction of the threaded guide rail II. Through setting up smooth guide rail II, when rotating threaded guide rail II and adjusting the position of crosshead shoe, crosshead shoe receives the spacing of smooth guide rail II, can not rotate, can only take place along II axial relative movement of threaded guide rail.
Further, one end that screw thread guide I runs through the base fixed block and one that screw thread guide II runs through spout connection platform serve all coaxial fixed with the carousel.
Has the advantages that: the rotary table is arranged, so that the threaded guide rail I and the threaded guide rail II can be conveniently rotated, and the adjustment of the head type position of the dummy can be conveniently completed.
Furthermore, rocking handles are eccentrically arranged on the rotary table.
Has the advantages that: the arrangement of the rocking handle can facilitate holding and rotating the turntable.
Furthermore, be fixed with two sawtooth platforms on the horizontal groove platform, two sawtooth platforms are located the both sides of bracing piece respectively, and the both sides of bracing piece still are equipped with the dead slot, are equipped with the preforming between dead slot and the sawtooth platform, pass through the bolt fastening between preforming and the horizontal groove platform.
Has the advantages that: the bracing piece compresses tightly on horizontal groove platform through the preforming, can adjust the intensity of compression through twisting the bolt according to actual demand. And the one end of preforming is located the dead slot on the bracing piece, realizes spacingly, and the other end of preforming carries on spacingly through the sawtooth platform, can avoid the bracing piece to take place to rock in the use.
Furthermore, the dummy head-shaped assembly also comprises a head-shaped base, and the head-shaped base is fixed on the mounting disc II; the middle part of the head-shaped base is provided with a groove, and a bubble-type level gauge is arranged in the groove.
Has the advantages that: the bubble type level gauge is arranged, so that the dummy head can be conveniently leveled.
Further, a rubber ring is fixed at the bottom of the collapsing rod.
Has the advantages that: the rubber ring can play a role in buffering the sliding of the collapsing rod.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the adjustable cross platform in this embodiment;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic structural diagram of a data acquisition assembly and a dummy head assembly in the present embodiment;
fig. 5 is a schematic view of the test at a top pressure angle of 25 °.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a mounting disc I1, a mounting base 2, a base fixing block 3, a smooth guide rail I4, a threaded guide rail I5, a crosshead shoe 6, a horizontal groove table 7, a chute connecting table 8, a smooth guide rail II 9, a threaded guide rail II 10, a rotary table 11, a rocking handle 12, a supporting rod 13, a collapsing rod 14, a pressing plate 15, a pressing plate 16, a sawtooth table 17, a T table bolt 18, a hollow groove 19, a sleeve 20, a triaxial force sensor 21, a mounting disc II 22, a head type base 23, a bubble type level meter 24, a dummy head type 25, a head type adjusting screw 26 and jacking equipment 27.
Example 1:
the utility model provides a compressive strength test device system with overload protection function, is shown as attached figure 1 basically, includes installation disc I1, adjustable cross platform, the mechanism that contracts of ulcerate, data acquisition subassembly and dummy head type subassembly that set gradually from supreme down, and evenly distributed has a plurality of screw holes on the installation disc I1, can utilize the bolt to fix installation disc I1 in the automobile body that awaits measuring.
As shown in the combined drawing 2, the adjustable cross platform comprises an installation base 2, a cross slide block 6 and a horizontal groove platform 7 which are sequentially arranged from bottom to top, the installation base 2 is fixed on an installation disc I1 through bolts, and base fixing blocks 3 are fixed on the front end and the rear end of the upper surface of the installation base 2 through bolts. Two smooth guide rails I4 are fixed between the opposite sides of the two base fixing blocks 3, the two smooth guide rails I4 penetrate through the cross-shaped sliding block 6, and the cross-shaped sliding block 6 can axially slide along the smooth guide rails I4. Still rotate between 3 relative one sides of two base fixed blocks and be connected with a screw thread guide rail I5, screw thread guide rail I5 is parallel with two smooth guide rail I4, and screw thread guide rail I5 is located between two smooth guide rail I4. Threaded guide I5 runs through crosshead 6, and threaded guide I5 and crosshead 6 threaded connection.
The left end and the right end of the bottom surface of the horizontal groove table 7 are both fixed with a sliding groove connecting table 8 through bolts, and the horizontal groove table 7 is perpendicular to the mounting base 2. Two smooth guide rails II 9 are fixed between one side that two spout connection platforms 8 are relative, and smooth guide rail II 9 all is perpendicular with smooth guide rail I4, and two smooth guide rail II 9 run through crosshead shoe 6, and can take place along the axial relative slip of smooth guide rail II 9 between crosshead shoe 6 and smooth guide rail II 9. And a threaded guide rail II 10 is rotatably connected between one opposite sides of the two chute connecting tables 8, the threaded guide rail II 10 is parallel to the two smooth guide rails II 9, and the threaded guide rail II 10 is positioned between the two smooth guide rails II 9. The threaded guide rail II 10 penetrates through the crosshead 6, and the threaded guide rail II 10 is in threaded connection with the crosshead 6.
Screw thread guide I5 runs through the base fixed block 3 of front side, and screw thread guide II 10 runs through left spout and connects platform 8, and the front end of screw thread guide I5 and the left end of screw thread guide II 10 all coaxial fixation have carousel 11, and equal eccentric fixation has the rocker on the carousel 11.
The collapsing mechanism comprises a supporting rod 13 and a collapsing rod 14 which are vertically arranged, a vertical slotted hole is arranged in the supporting rod 13, the slotted hole is a through hole, and a strip-shaped hole communicated with the slotted hole is arranged on the front side surface of the supporting rod 13. The collapsing rod 14 is located in the slot, the collapsing rod 14 can vertically slide along the slot, and a rubber ring is fixed at the bottom of the collapsing rod 14. The crumple mechanism further comprises a pressure plate 15 attached to the front side face of the support rod 13, the pressure plate 15 is connected with the crumple rod 14 through bolts, the bolts penetrate through the strip-shaped holes, and the degree of compression between the pressure plate 15 and the support rod 13 can be adjusted through adjusting the screwing degree of the bolts. The front side surface of the supporting rod 13 is provided with first sawteeth, one side of the pressing plate 15, which is close to the supporting rod 13, is provided with second sawteeth matched with the first sawteeth, and the contact area between the pressing plate 15 and the supporting rod 13 can be adjusted.
Referring to fig. 3, sawtooth platforms 17 are fixed on both sides of the support rod 13 on the upper surface of the horizontal groove platform 7, and the sawtooth surfaces of the sawtooth platforms 17 are inclined downwards in the direction close to the support rod 13. The lower parts of the left side and the right side of the supporting rod 13 are provided with empty grooves 19 and two pressing sheets 16. Taking the left pressing surface as an example, the right end of the pressing piece 16 is positioned in the empty groove 19 and abuts against the bottom surface of the empty groove 19, and the left end of the pressing piece 16 abuts against the sawtooth surface of the left sawtooth table 17. And set up a T platform bolt 18, T platform bolt 18 is located the spout of horizontal groove platform 7, and the longitudinal section of spout is the T type with T platform nut complex, can realize spacing to T platform bolt 18. The T-shaped bolt 18 penetrates through the pressing sheet 16, and a nut is connected to the T-shaped bolt 18 in a threaded mode. Therefore, by tightening the nut, the pressing piece 16 can be pressed against the support rod 13 and the serration 17, thereby fixing the support rod 13 to the horizontal groove base 7.
Referring to fig. 4, the data acquisition assembly includes a sleeve 20 and a triaxial force sensor 21, the bottom of the sleeve 20 is sleeved on the top of the collapsing rod 14, and the sleeve 20 is fixed on the top of the collapsing rod 14 by bolts. The top end inner ring of the sleeve 20 is provided with threads, and the lower end face of the triaxial force sensor 21 is provided with threads matched with the top end inner ring of the sleeve 20, so that the triaxial force sensor 21 can be fixed on the sleeve 20.
The dummy head type assembly comprises a mounting disc II 22, a head type base 23 and a dummy head type 25 which are sequentially arranged from bottom to top, and the mounting disc II 22 is fixed to the top of the triaxial force sensor 21 through a bolt. Four head-shaped adjusting screws 26 are fixed at the bottom of the dummy head 25, two nuts are fixed on each head-shaped adjusting screw 26, during assembly, the head-shaped adjusting screws 26 penetrate through the mounting disc II 22, the two nuts on each head-shaped adjusting screw 26 are respectively positioned at the upper side and the lower side of the mounting disc II 22, and the nuts are screwed, so that the dummy head 25 can be mounted.
Four mounting rods are further fixed at the bottom of the dummy head 25 at the inner rings of the four adjusting screws, and the bottom ends of the mounting rods are fixed on the fixed surface of the head base 23. The middle part of the top surface of the head-shaped base 23 is provided with a groove, a bubble type level gauge 24 is arranged in the groove, and the bubble type level gauge 24 can be fixed through hot melt adhesive.
As shown in fig. 5, a pressing device 27 is further included for providing a test pressure, and when in use, the pressing device 27 is placed on the upper part of the vehicle roof, and the pressure is provided by the pressing device 27, so that the compression strength test can be completed.
The specific implementation process is as follows:
when the compressive strength of the roof needs to be tested, the vehicle seat in the vehicle body is detached, and the mounting disc I1 is fixed at the position where the seat is originally arranged by using a bolt. And then, the position of the dummy head 25 is adjusted by using the adjustable cross platform, specifically, the rocking handle 12 is held in sequence, and the turntables 11 at the lower part and the upper part are rotated, so that the rotation of the threaded guide rail I5 and the threaded guide rail II 10 is realized. When the threaded guide rail I5 rotates, the crumple mechanism, the data acquisition assembly and the dummy head type assembly above the crosshead 6 can be driven to move along the axial direction of the threaded guide rail I5; when the threaded guide rail II 10 rotates, the crosshead shoe 6 is limited, so that the horizontal groove table 7 slides along the axial direction of the threaded guide rail II 10, and the adjustment of the dummy head form 25 in the X direction and the Y direction is realized until the dummy head form 25 is adjusted to a proper position.
And then the triaxial force sensor 21 is connected with data acquisition equipment to realize real-time data acquisition. According to actual requirements, as shown in fig. 5, the jacking device 27 is arranged above the vehicle roof, the pressure of the jacking device 27 and the angle (for example, 25 °) of the pressure head are adjusted, the jacking device 27 is used for impacting the vehicle roof, after the vehicle roof is stressed, the vehicle roof is deformed and then impacts the dummy head shape 25, in the process, the triaxial force sensor 21 is used for sensing the stress of the dummy head shape 25, and data are transmitted to the data acquisition device.
When the pressure of the dummy head 25 is greater than the friction between the pressure plate 15 and the support rod 13 during the process of pressing the dummy head 25, the collapsing rod 14 slides downwards, so that the collapsing rod 14 and the dummy head 25 are protected, and the probability of breakage is reduced. And the friction force between the pressing plate 15 and the supporting rod 13 can be adjusted by adjusting the bolts on the pressing plate 15 by a torque wrench.
For those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the patent and the practicability of the patent.
Claims (10)
1. The utility model provides a compressive strength test device system with overload protection function which characterized in that: the artificial head type artificial hand comprises a mounting disc I, a collapsing mechanism, a data acquisition assembly and a dummy head type assembly which are sequentially arranged from bottom to top, wherein the collapsing mechanism comprises a supporting rod provided with a slotted hole and a collapsing rod vertically connected in the slotted hole in a sliding manner, the supporting rod is fixed on the mounting disc I, the supporting rod is provided with a strip-shaped hole communicated with the slotted hole, the collapsing rod is connected with a pressing plate through a bolt, and the pressing plate is tightly attached to one side of the supporting rod, which is provided with the strip-shaped hole; the data acquisition assembly comprises a sleeve fixed at the top of the collapsing rod and a triaxial force sensor fixed at the top of the sleeve; the dummy head type assembly comprises a mounting disc II fixed at the top of the triaxial force sensor and a dummy head type fixed on the mounting disc II; the test device also comprises a jacking device for providing test pressure.
2. The compressive strength testing device system with the overload protection function as claimed in claim 1, wherein: the side that the bracing piece is equipped with the bar hole is equipped with first sawtooth, and the clamp plate is close to one side of bracing piece and is equipped with the second sawtooth with first sawtooth complex.
3. The compressive strength testing device system with the overload protection function as claimed in claim 2, wherein: an adjustable cross platform is further arranged between the mounting disc I and the collapsing mechanism, the adjustable cross platform comprises a mounting base, a cross sliding block and a horizontal groove platform which are sequentially arranged from bottom to top, and the mounting base is fixed on the mounting disc I; base fixing blocks are fixed at two ends of the mounting base, a threaded guide rail I is rotatably connected between the two base fixing blocks, the threaded guide rail I penetrates through the crosshead shoe and one of the base fixing blocks, and the threaded guide rail I is in threaded connection with the crosshead shoe; the both ends of horizontal groove platform bottom surface all are fixed with the spout and connect the platform, rotate between two spout connection platforms to be connected with screw thread guide rail II, and screw thread guide rail II runs through crosshead shoe and one of them spout connection platform, and screw thread guide rail II also with crosshead shoe threaded connection, and screw thread guide rail II sets up with screw thread guide rail I is perpendicular.
4. The compressive strength testing device system with overload protection function as claimed in claim 3, wherein: still be fixed with smooth guide rail I parallel with screw thread guide rail I between two base fixed blocks, smooth guide rail I runs through the crosshead shoe, and smooth guide rail I is along its axial sliding connection on the crosshead shoe.
5. The compressive strength testing device system with the overload protection function as claimed in claim 4, wherein: a smooth guide rail II parallel to the threaded guide rail II is fixed between the two sliding groove connecting tables, the smooth guide rail II penetrates through the crosshead shoe, and the smooth guide rail II is connected to the crosshead shoe along the axial direction of the smooth guide rail II in a sliding mode.
6. The compressive strength testing device system with the overload protection function as claimed in claim 5, wherein: one end that screw thread guide rail I runs through the base fixed block and one that screw thread guide rail II runs through spout connection platform serve all coaxial fixed with the carousel.
7. The compressive strength testing device system with the overload protection function as claimed in claim 6, wherein: rocking handles are eccentrically arranged on the turnplates.
8. The compressive strength testing device system with overload protection function as claimed in claim 7, wherein: the horizontal groove table is fixedly provided with two sawtooth tables which are respectively positioned at two sides of the supporting rod, empty grooves are also formed in two sides of the supporting rod, pressing sheets are arranged between the empty grooves and the sawtooth tables, and the pressing sheets and the horizontal groove table are fixed through bolts.
9. The compressive strength testing device system with overload protection function as claimed in claim 8, wherein: the dummy head-shaped assembly also comprises a head-shaped base, and the head-shaped base is fixed on the mounting disc II; the middle part of the head-shaped base is provided with a groove, and a bubble-type level gauge is arranged in the groove.
10. The compressive strength testing device system with overload protection function as claimed in claim 9, wherein: and a rubber ring is fixed at the bottom of the collapsing rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021571785.5U CN212646325U (en) | 2020-07-31 | 2020-07-31 | Compressive strength test device system with overload protection function |
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| CN202021571785.5U CN212646325U (en) | 2020-07-31 | 2020-07-31 | Compressive strength test device system with overload protection function |
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| CN212646325U true CN212646325U (en) | 2021-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235438A (en) * | 2021-12-22 | 2022-03-25 | 上海机动车检测认证技术研究中心有限公司 | Testing device for simulating head extrusion stress of passenger |
-
2020
- 2020-07-31 CN CN202021571785.5U patent/CN212646325U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235438A (en) * | 2021-12-22 | 2022-03-25 | 上海机动车检测认证技术研究中心有限公司 | Testing device for simulating head extrusion stress of passenger |
| CN114235438B (en) * | 2021-12-22 | 2024-05-28 | 上海机动车检测认证技术研究中心有限公司 | Testing device for simulating extrusion stress of head of passenger |
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