CN210175797U

CN210175797U - Movable mounting platform for large-scale precision impact test

Info

Publication number: CN210175797U
Application number: CN201921159796.XU
Authority: CN
Inventors: Guijuan Sun; 孙桂娟; Weiliang Gao; 高伟亮; Xing Wang; 王幸; Ruichao Liu; 刘瑞朝; Jianchao Yang; 杨建超; Xinjian Ren; 任新见; Zhiyang Sun; 孙志杨; Guangfei You; 游广飞
Original assignee: Institute of Engineering Protection National Defense Engineering Research Institute Academy of Military Sciences of PLA
Current assignee: Institute of Engineering Protection National Defense Engineering Research Institute Academy of Military Sciences of PLA
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-03-24
Anticipated expiration: 2029-07-23

Abstract

The utility model relates to a remove mounting platform for large-scale accurate impact test, including parallel track, platform, bear car, synchronous elevating gear, damping buffer and boundary restraint device, the connecting plate below of bearing the car symmetry setting in the platform both sides and move on the track, every bears the car both ends and is connected with two connecting plates of one side with the platform through the guide post respectively, every both ends that bear the car all are provided with synchronous elevating gear and through the lift of synchronous elevating gear control platform, damping buffer set up at platform up end middle part, boundary restraint device sets up in platform up end both sides. The utility model discloses possess the function of test piece installation and transport, the actuating mechanism of platform can separate with the test piece when experimental simultaneously, avoids receiving the impact damage.

Description

Movable mounting platform for large-scale precision impact test

Technical Field

The utility model relates to an impact test technique specifically is a remove mounting platform for large-scale accurate impact test.

Background

In a large-scale precision impact test, the impact plate is positioned in the middle below the truss, the position of the test piece is corresponding to the impact plate, and the test piece needs to be installed and fixed and then conveyed to the lower side of the truss due to large mass and large volume of the test piece, and then the impact test is carried out. During the test, the impact plate can exert huge impulse to the test piece, and the transportation equipment below must separate with the test piece this moment, makes the weight of test piece fall on the load-bearing terrace below, just so can reduce or avoid the influence that transportation equipment received. Therefore, the transportation equipment not only has the function of conveying the test piece, but also has the functions of lifting and positioning the test piece, and can buffer and absorb energy for impact during an impact test. At present, no mature equipment is available in the prior art, so that a mobile mounting platform for large-scale precision impact tests is necessary to design.

Disclosure of Invention

The utility model aims at providing a remove mounting platform for large-scale accurate impact test, can use the car that bears that can walk by oneself through the bottom surface both sides setting at the platform to through setting up the elevating gear control platform lift on bearing the car, set up damping buffer and the boundary restraint device that is used for installing fixed test piece simultaneously on the platform, make the platform possess the function of test piece installation and transport, the actuating mechanism of platform can separate with the test piece when experimental simultaneously, avoids receiving the impact damage.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a movable mounting platform for a large-scale precision impact test comprises parallel rails, a platform, bearing vehicles, synchronous lifting devices, damping buffer devices and boundary constraint devices, wherein the parallel rails are fixedly connected with a rail terrace of a foundation, the platform is integrally of a steel rectangular plate-shaped structure, connecting plates which are parallel at intervals are symmetrically arranged on two sides of the platform, guide holes are formed in each connecting plate, the bearing vehicles are symmetrically arranged below the connecting plates on the two sides of the platform and run on the rail, two ends of each bearing vehicle are respectively connected with the two connecting plates on the same side of the platform through guide posts, the synchronous lifting devices are arranged at two ends of each bearing vehicle and control the lifting of the platform through the synchronous lifting devices, the damping buffer devices are arranged in the middle of the upper end face of the platform, and the boundary constraint devices are arranged on two sides of the upper end face of the platform; the bearing vehicle is formed by combining two vehicle bodies through a connecting rod, the two vehicle bodies are respectively arranged below two connecting plates on the same side of a platform, the whole vehicle body is of a cuboid structure, two ends of the lower part of the vehicle body are respectively provided with a track wheel, the middle part of the upper end surface of the vehicle body is provided with a through groove vertical to the length direction of the vehicle body, the middle part of the bottom wall of the through groove is provided with a synchronous lifting device, guide posts are symmetrically arranged on the bottom walls of the through grooves on two sides of the synchronous lifting device and matched with guide holes on the corresponding platform connecting plates, the front end of the connecting rod is fixedly connected with the rear end of one vehicle body, and the rear end; the bearing vehicle is also provided with a synchronous motor which is arranged on the side surface of one vehicle body of the bearing vehicle and drives a wheel shaft of one rail wheel on the vehicle body through a speed reducing mechanism.

The damping buffer device comprises a cylinder body, a cylinder seat, a cylinder cover, a piston, a connecting rod, a bearing plate, a buffer block and a guide rod, wherein the cylinder seat is fixedly connected with a platform through a bolt, the lower end of the cylinder body is fixedly arranged on the cylinder seat and is in sealing connection with the cylinder seat, the cylinder cover is fixedly arranged at the upper end of the cylinder body and is in sealing connection with the cylinder body, the piston is arranged in the cylinder body and is in sliding sealing fit with the cylinder body, an air inlet and an air outlet which are communicated with the inside of the cylinder body are respectively arranged on the cylinder seat, the middle part of the piston is provided with a coaxial axial through hole A, uniformly distributed axial through holes C are arranged by taking the through hole A as the center, the guide rod is arranged in each axial through hole C, the lower end of the guide rod is arranged on the cylinder seat, the upper end of the guide rod is arranged on the, the lower end of the connecting rod is fixedly integrated with the piston, the upper end of the connecting rod is fixedly connected with a bearing plate, and a buffer block is arranged on the bearing plate; the whole guide rod is of a stepped shaft structure made of high-strength alloy steel and comprises a first stepped shaft, a second stepped shaft, a transition part and a positioning shaft, wherein the first stepped shaft penetrates through an axial through hole C of the piston and is in sliding seal fit with the axial through hole C, the diameter of the first stepped shaft is larger than that of the second stepped shaft, the upper end of the first stepped shaft is provided with the coaxial positioning shaft, the lower part of the first stepped shaft is provided with the coaxial second stepped shaft, the transition part is arranged between the first stepped shaft and the second stepped shaft and is fixed into a whole through the transition part, the transition part is of a conical table structure, the diameter of the upper end surface of the transition part is equal to that of the first stepped shaft, and the diameter of the lower end surface of the transition part is equal to that of the second stepped shaft; the upper end surface of the cylinder base is provided with uniformly distributed mounting holes which correspond to the axial through holes C of the piston one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the second step shaft of the guide rod; the lower end face of the cylinder cover is provided with uniformly distributed positioning holes which correspond to the axial through holes C of the piston one by one, and the inner diameter of each positioning hole is in clearance fit with the outer diameter of the guide rod positioning shaft; an inner hole with one open end is coaxially arranged in the connecting rod, and the open end of the inner hole is positioned at the lower end of the connecting rod and is communicated with the axial through hole A of the piston; the inlet end of the air inlet of the cylinder seat is communicated with an external air inlet pipeline through a check valve, and the outlet end of the exhaust hole of the cylinder seat is communicated with an external loop through a pressure reducing valve.

The boundary restraining device comprises a left moving jacking device and a right moving jacking device, the left moving jacking device is arranged on the left side of the long axis of the platform, the right moving jacking device is arranged on the right side of the long axis of the platform, the left and right moving jacking devices are symmetrical about the long axis of the platform, the left moving jacking device comprises two guide rail groups, a bottom plate, an upright post, a cross beam, a moving block, a jacking block and a fixed block, the number of the guide rail groups is two, each guide rail group is composed of a pair of linear guide rails parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the length direction of the platform at intervals, the fixed block is arranged on the experimental platform between the two linear guide rails of each guide rail group, the bottom plate is arranged above each guide rail group and detachably and fixedly connected with the platform through the fixed block, and the two sides of the bottom surface of the bottom plate, the upper end surface of the bottom plate is provided with upright columns perpendicular to the upper end surface of the bottom plate at intervals at one side perpendicular to the guide rail, the cross beam is arranged above the two bottom plates and is fixedly connected with the upper end of each upright column on the two bottom plates respectively, a moving block capable of moving in the long axis direction of the cross beam is sleeved on the cross beam between the two adjacent upright columns respectively, and the middle part of each moving block is provided with a jacking block for jacking the test piece tightly; the whole moving block is of a rectangular box-type structure with openings at two ends, the external dimensions of the openings at two ends of the moving block are matched with the external dimensions of the cross section of the cross beam, and assembling holes for installing the jacking block are symmetrically formed in two side walls of the moving block; the tightening block is composed of a positioning sleeve, a tightening nut and a fastening bolt, the positioning sleeve is integrally of a cylindrical structure, a threaded through hole is formed in the positioning sleeve, the fastening bolt for tightening the test piece is arranged in the threaded through hole, external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve, and the external threads are respectively installed in assembly holes in two side walls of the moving block through the tightening nut; the whole crossbeam is of a cuboid frame structure with an upper opening and a lower opening, through grooves are symmetrically arranged on two sides of the crossbeam in the length direction, and the axial line of the through grooves in the length direction is equal to the center of the movable block assembly hole in height; the lower end face of the fixed block is fixedly connected with the platform, the upper end face of the fixed block is provided with uniformly distributed threaded holes according to a rectangular array, and the bottom plate is fixedly connected with the fixed block through bolts; the bottom plate is characterized in that a baffle plate used for bearing external drive is further arranged between the adjacent stand columns on the upper end face of the bottom plate, the lower end of the baffle plate is fixedly connected with the bottom plate, and two ends of the baffle plate are fixedly connected with the stand columns respectively.

The synchronous lifting device is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body through an oil cylinder seat, and the initial zero position of the synchronous oil cylinder is lower than the upper end surface of the vehicle body.

The utility model has the advantages that: the utility model discloses a test platform, including bearing car, damping buffer device, boundary restraint device, test system, drive mechanism, test system, limit device, damping buffer device.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a schematic view of the structure relationship of the middle rail, the platform and the carrying vehicle of the present invention.

Fig. 4 is a schematic view of the middle damping buffer device of the present invention.

Fig. 5 is a schematic view of a piston in the damping buffer device.

Fig. 6 is a schematic diagram of a moving block in the boundary constraining apparatus.

FIG. 7 is a diagram of a top level block in a boundary constraint device.

In the figure, 1, a track, 2, a platform, 201, a connecting plate, 202, a guide hole, 301, a vehicle body, 302, a connecting rod, 303, a synchronous motor, 304, a track wheel, 305, a speed reducing mechanism, 306, a wheel shaft, 4, a synchronous oil cylinder, 401 and an oil cylinder seat,

5. damping buffer device 501, cylinder body 502, cylinder seat 503, cylinder cover 504, piston 505, connecting rod 506, bearing plate 507, buffer block 508, guide rod 509, air inlet hole 510, exhaust hole 541, axial through hole A, 542, axial through hole C, 551, inner hole 581, first step shaft 582, second step shaft 583, transition part 584, positioning shaft 585 and spring,

601. a bottom plate, 602, upright posts, 603, cross beams, 604, moving blocks, 605, jacking blocks, 606, fixing blocks, 608, linear guide rails, 609, baffles, 651, positioning sleeves, 652, tightening nuts, 653 and fastening bolts,

10. and a guide post.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a movable mounting platform for large-scale precision impact test comprises a parallel track 1, a platform 2, a bearing vehicle, a synchronous lifting device, a damping buffer device 5 and a boundary constraint device, wherein the parallel track 1 is fixedly connected with a track terrace of a foundation, the platform 2 is integrally of a steel rectangular plate-shaped structure, two sides of the platform are symmetrically provided with connecting plates 201 which are parallel at intervals, each connecting plate 201 is provided with a guide hole 202, the bearing vehicle is symmetrically arranged below the connecting plates 201 at two sides of the platform 2 and runs on the track 1, two ends of each bearing vehicle are respectively connected with the two connecting plates 201 at the same side of the platform 2 through guide posts 10, two ends of each bearing vehicle are provided with the synchronous lifting device and control the lifting of the platform 2 through the synchronous lifting device, the damping buffer devices 5 are arranged in the middle of the upper end face of the platform 2, the boundary constraint devices are arranged on two sides of the upper end surface of the platform 2; the carrier vehicle is formed by combining two vehicle bodies 301 through a connecting rod 302, the two vehicle bodies 301 are respectively arranged below two connecting plates 201 on the same side of a platform 2, the whole vehicle body 301 is of a cuboid structure, two ends of the lower part of the vehicle body 301 are respectively provided with a track wheel 304, the middle part of the upper end face of the vehicle body 301 is provided with a through groove vertical to the length direction of the vehicle body 301, the middle part of the bottom wall of the through groove is provided with a synchronous lifting device, guide posts 10 are symmetrically arranged on the bottom walls of the through grooves on two sides of the synchronous lifting device, the guide posts 10 are matched with corresponding guide holes 202 on the platform connecting plates 201, the front end of the connecting rod 302 is fixedly connected with the rear end of one vehicle body 301, and the rear; the carrier vehicle is also provided with a synchronous motor 303, the synchronous motor 303 is arranged on the side surface of a vehicle body 301 of the carrier vehicle and drives a wheel shaft 306 of a track wheel 304 on the vehicle body through a speed reducing mechanism 305; the synchronous lifting device 4 is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body 301 through an oil cylinder seat 401, and the initial zero position of the synchronous oil cylinder 4 is lower than the upper end surface of the vehicle body 301.

As shown in fig. 3 and 4, the damping and buffering device comprises a cylinder body 501, a cylinder base 502, a cylinder cover 503, a piston 504, a connecting rod 505, a bearing plate 506, a buffering block 507 and a guiding rod 508, wherein the cylinder base 502 is fixedly connected with the platform 2 through bolts, the lower end of the cylinder body 501 is fixedly arranged on the cylinder base 502 and is hermetically connected with the cylinder base 502, the cylinder cover 503 is fixedly arranged at the upper end of the cylinder body 501 and is hermetically connected with the cylinder body 501, the piston 504 is arranged in the cylinder body 501 and is in sliding and sealing fit with the cylinder body 501, the cylinder base 502 is respectively provided with an air inlet 509 and an air outlet 510 which are communicated with the interior of the cylinder body 501, the middle part of the piston 504 is provided with a coaxial axial through hole a and is provided with uniformly distributed axial through holes C542 by taking the through hole a541 as a center, a guiding rod 508 is arranged in each axial through hole C541, the lower end of the, a spring 585 is sleeved between the lower end of the guide rod and the piston, the connecting rod 505 penetrates through the middle of the cylinder cover 503 and is in sliding sealing fit with the cylinder cover 503, the lower end of the connecting rod 505 is fixed with the piston 504 into a whole, the upper end of the connecting rod 505 is fixedly connected with the bearing plate 506, and the bearing plate 506 is provided with a buffer block 507; the whole guide rod 508 is of a stepped shaft structure made of high-strength alloy steel, and comprises a first stepped shaft 581, a second stepped shaft 582, a transition portion 583 and a positioning shaft 584, wherein the first stepped shaft 581 is arranged in an axial through hole C542 of the piston 504 in a penetrating manner and is in sliding sealing fit with the axial through hole C542, the diameter of the first stepped shaft 581 is larger than that of the second stepped shaft 582, the upper end of the first stepped shaft 581 is provided with the coaxial positioning shaft 584, the lower portion of the first stepped shaft 581 is provided with the coaxial second stepped shaft 582, the transition portion 583 is arranged between the first stepped shaft 581 and the second stepped shaft 582 and is fixed into a whole through the transition portion 583, the transition portion 583 is of a conical structure, the diameter of the upper end surface of the transition portion is equal to that of the first stepped shaft 581, and the diameter of the lower end surface of the transition portion is equal to that of the second stepped shaft 582; the upper end surface of the cylinder base 502 is provided with uniformly distributed mounting holes which correspond to the axial through holes C542 of the piston 504 one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the guide rod second step shaft 582; the lower end face of the cylinder cover 503 is provided with positioning holes which are uniformly distributed and correspond to the axial through holes C542 of the piston 504 one by one, and the inner diameter of each positioning hole is in clearance fit with the outer diameter of the guide rod positioning shaft 584; an inner hole 551 with one open end is coaxially arranged in the connecting rod 505, and the open end of the inner hole 551 is positioned at the lower end of the connecting rod 505 and is communicated with an axial through hole A541 of the piston 504; the inlet end of the air inlet 509 of the cylinder seat 502 is communicated with an external air inlet pipeline through a check valve, and the outlet end of the cylinder seat exhaust hole 510 is communicated with an external loop through a pressure reducing valve.

The boundary restraining device comprises a left moving jacking device and a right moving jacking device, the left moving jacking device is arranged on the left side of the long axis of the platform, the right moving jacking device is arranged on the right side of the long axis of the platform, the left and right moving jacking devices are symmetrical about the long axis of the platform 2, the left moving jacking device comprises two guide rail groups, a bottom plate 601, a vertical column 602, a cross beam 603, a moving block 604, a jacking block 605 and a fixed block 606, each guide rail group is composed of a pair of linear guide rails 608 parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the length direction of the platform 2 at intervals, the fixed block 606 is arranged on the platform 2 between the two linear guide rails 608 of each guide rail group, the bottom plate 601 is arranged above each guide rail group, the bottom plate 601 is detachably and fixedly connected with the platform 2 through the fixed block 606, two sides of the bottom surface of the bottom plate 601 run on the parallel linear guide rails 608 through sliding, upright posts 602 perpendicular to the upper end surface of the bottom plate 601 are arranged on one side of the upper end surface of the bottom plate 601 perpendicular to the guide rail 608 at intervals, the cross beam 603 is arranged above the two bottom plates 601 and is fixedly connected with the upper end of each upright post 602 on the two bottom plates 601 respectively, moving blocks 604 capable of moving in the long axis direction of the cross beam 603 are sleeved on the cross beam 603 between the two adjacent upright posts 602 respectively, and a jacking block 605 for jacking a test piece is arranged in the middle of each moving block 604; the whole moving block 604 is of a rectangular box-type structure with openings at two ends, the external dimensions of the openings at two ends are matched with the external dimensions of the cross section of the cross beam 603, and assembling holes for mounting the jacking block 605 are symmetrically formed in two side walls of the moving block 604; the tightening block 605 is composed of a positioning sleeve 651, a tightening nut 652 and a fastening bolt 653, the positioning sleeve 651 is integrally of a cylindrical structure, a threaded through hole is formed in the positioning sleeve 651, the fastening bolt 653 used for tightening the test piece is arranged in the threaded through hole, external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve 651, and the two ends of the outer cylindrical surface of the positioning sleeve 651 are respectively installed in assembling holes in two side walls of the moving block 604 through the tightening nut 652; the whole beam 603 is of a rectangular frame structure with an upper opening and a lower opening, through grooves are symmetrically arranged on two sides in the length direction, and the axial line in the length direction of each through groove is as high as the center of the assembly hole of the moving block 604; the lower end face of the fixed block 606 is fixedly connected with the platform 2, the upper end face of the fixed block 606 is provided with uniformly distributed threaded holes according to a rectangular array, and the bottom plate 601 is fixedly connected with the fixed block 606 through bolts; a baffle 609 used for bearing external drive is further arranged between the upright posts 602 adjacent to the upper end surface of the bottom plate 601, the lower end of the baffle 609 is fixedly connected with the bottom plate 601, and two ends of the baffle 609 are fixedly connected with the upright posts 602 respectively.

The synchronous lifting device 4 is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body 301 through an oil cylinder seat 401, and the initial zero position of the synchronous oil cylinder 4 is lower than the upper end surface of the vehicle body 301.

The utility model discloses a use method: lifting the lifting device of the movable mounting platform, placing a test piece on a buffer block of the damping buffer device through lifting equipment, adjusting the boundary constraint device to enable the bottom plate 601 to be in a proper position, fixedly connecting the bottom plate 601 with the fixed plate 606 through bolts, adjusting the moving block 604 to be in a proper position, screwing the jacking block 605, and fixedly clamping the test piece; drive platform 2 to experimental position, elevating gear descends, only needs to set up the load device of take the altitude in the bottom surface below of platform 2 this moment, can make 2 bottom surfaces of platform bear gravity to make the drive arrangement of platform 2 and elevating gear all not atress, when carrying out impact test, can effectively protect drive arrangement not receive the damage.

The part of the utility model not detailed is prior art.

Claims

1. The utility model provides a remove mounting platform for large-scale precision impact test, includes parallel track, platform, bears car, synchronous elevating gear, damping buffer and boundary restraint device, the track terrace of parallel track and ground link firmly characterized by: the whole platform is of a steel rectangular plate-shaped structure, connecting plates which are parallel at intervals are symmetrically arranged on two sides of the platform, a guide hole is formed in each connecting plate, the bearing vehicles are symmetrically arranged below the connecting plates on the two sides of the platform and run on the track, two ends of each bearing vehicle are connected with the two connecting plates on the same side of the platform through guide posts, a synchronous lifting device is arranged at two ends of each bearing vehicle and controls the lifting of the platform through the synchronous lifting device, the damping buffer device is arranged in the middle of the upper end face of the platform, and the boundary constraint devices are arranged on two sides of the upper end face of the platform; the bearing vehicle is formed by combining two vehicle bodies through a connecting rod, the two vehicle bodies are respectively arranged below two connecting plates on the same side of a platform, the whole vehicle body is of a cuboid structure, two ends of the lower part of the vehicle body are respectively provided with a track wheel, the middle part of the upper end surface of the vehicle body is provided with a through groove vertical to the length direction of the vehicle body, the middle part of the bottom wall of the through groove is provided with a synchronous lifting device, guide posts are symmetrically arranged on the bottom walls of the through grooves on two sides of the synchronous lifting device and matched with guide holes on the corresponding platform connecting plates, the front end of the connecting rod is fixedly connected with the rear end of one vehicle body, and the rear end; the bearing vehicle is also provided with a synchronous motor which is arranged on the side surface of one vehicle body of the bearing vehicle and drives a wheel shaft of one rail wheel on the vehicle body through a speed reducing mechanism.

2. The movable mounting platform for large-scale precision impact test according to claim 1, wherein: the damping buffer device comprises a cylinder body, a cylinder seat, a cylinder cover, a piston, a connecting rod, a bearing plate, a buffer block and a guide rod, wherein the cylinder seat is fixedly connected with a platform through a bolt, the lower end of the cylinder body is fixedly arranged on the cylinder seat and is in sealing connection with the cylinder seat, the cylinder cover is fixedly arranged at the upper end of the cylinder body and is in sealing connection with the cylinder body, the piston is arranged in the cylinder body and is in sliding sealing fit with the cylinder body, an air inlet and an air outlet which are communicated with the inside of the cylinder body are respectively arranged on the cylinder seat, the middle part of the piston is provided with a coaxial axial through hole A, uniformly distributed axial through holes C are arranged by taking the through hole A as the center, the guide rod is arranged in each axial through hole C, the lower end of the guide rod is arranged on the cylinder seat, the upper end of the guide rod is arranged on the, the lower end of the connecting rod is fixedly integrated with the piston, the upper end of the connecting rod is fixedly connected with a bearing plate, and a buffer block is arranged on the bearing plate; the whole guide rod is of a stepped shaft structure made of high-strength alloy steel and comprises a first stepped shaft, a second stepped shaft, a transition part and a positioning shaft, wherein the first stepped shaft penetrates through an axial through hole C of the piston and is in sliding seal fit with the axial through hole C, the diameter of the first stepped shaft is larger than that of the second stepped shaft, the upper end of the first stepped shaft is provided with the coaxial positioning shaft, the lower part of the first stepped shaft is provided with the coaxial second stepped shaft, the transition part is arranged between the first stepped shaft and the second stepped shaft and is fixed into a whole through the transition part, the transition part is of a conical table structure, the diameter of the upper end surface of the transition part is equal to that of the first stepped shaft, and the diameter of the lower end surface of the transition part is equal to that of the second stepped shaft; the upper end surface of the cylinder base is provided with uniformly distributed mounting holes which correspond to the axial through holes C of the piston one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the second step shaft of the guide rod; the lower end face of the cylinder cover is provided with uniformly distributed positioning holes which correspond to the axial through holes C of the piston one by one, and the inner diameter of each positioning hole is in clearance fit with the outer diameter of the guide rod positioning shaft; an inner hole with one open end is coaxially arranged in the connecting rod, and the open end of the inner hole is positioned at the lower end of the connecting rod and is communicated with the axial through hole A of the piston; the inlet end of the air inlet of the cylinder seat is communicated with an external air inlet pipeline through a check valve, and the outlet end of the exhaust hole of the cylinder seat is communicated with an external loop through a pressure reducing valve.

3. The movable mounting platform for large-scale precision impact test according to claim 1, wherein: the boundary restraining device comprises a left moving jacking device and a right moving jacking device, the left moving jacking device is arranged on the left side of the long axis of the platform, the right moving jacking device is arranged on the right side of the long axis of the platform, the left and right moving jacking devices are symmetrical about the long axis of the platform, the left moving jacking device comprises two guide rail groups, a bottom plate, an upright post, a cross beam, a moving block, a jacking block and a fixed block, the number of the guide rail groups is two, each guide rail group is composed of a pair of linear guide rails parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the length direction of the platform at intervals, the fixed block is arranged on the experimental platform between the two linear guide rails of each guide rail group, the bottom plate is arranged above each guide rail group and detachably and fixedly connected with the platform through the fixed block, and the two sides of the bottom surface of the bottom plate, the upper end surface of the bottom plate is provided with upright columns perpendicular to the upper end surface of the bottom plate at intervals at one side perpendicular to the guide rail, the cross beam is arranged above the two bottom plates and is fixedly connected with the upper end of each upright column on the two bottom plates respectively, a moving block capable of moving in the long axis direction of the cross beam is sleeved on the cross beam between the two adjacent upright columns respectively, and the middle part of each moving block is provided with a jacking block for jacking the test piece tightly; the whole moving block is of a rectangular box-type structure with openings at two ends, the external dimensions of the openings at two ends of the moving block are matched with the external dimensions of the cross section of the cross beam, and assembling holes for installing the jacking block are symmetrically formed in two side walls of the moving block; the tightening block is composed of a positioning sleeve, a tightening nut and a fastening bolt, the positioning sleeve is integrally of a cylindrical structure, a threaded through hole is formed in the positioning sleeve, the fastening bolt for tightening the test piece is arranged in the threaded through hole, external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve, and the external threads are respectively installed in assembly holes in two side walls of the moving block through the tightening nut; the whole crossbeam is of a cuboid frame structure with an upper opening and a lower opening, through grooves are symmetrically arranged on two sides of the crossbeam in the length direction, and the axial line of the through grooves in the length direction is equal to the center of the movable block assembly hole in height; the lower end face of the fixed block is fixedly connected with the platform, the upper end face of the fixed block is provided with uniformly distributed threaded holes according to a rectangular array, and the bottom plate is fixedly connected with the fixed block through bolts; the bottom plate is characterized in that a baffle plate used for bearing external drive is further arranged between the adjacent stand columns on the upper end face of the bottom plate, the lower end of the baffle plate is fixedly connected with the bottom plate, and two ends of the baffle plate are fixedly connected with the stand columns respectively.

4. The movable mounting platform for large-scale precision impact test according to claim 1, wherein: the synchronous lifting device is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body through an oil cylinder seat, and the initial zero position of the synchronous oil cylinder is lower than the upper end surface of the vehicle body.