CN211477563U - Pulley block amplification acceleration type assembled drop hammer test system - Google Patents

Pulley block amplification acceleration type assembled drop hammer test system Download PDF

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CN211477563U
CN211477563U CN202020177484.8U CN202020177484U CN211477563U CN 211477563 U CN211477563 U CN 211477563U CN 202020177484 U CN202020177484 U CN 202020177484U CN 211477563 U CN211477563 U CN 211477563U
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pulley
impact
drop hammer
pulley block
sliding platform
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肖岩
赖大德
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a but assembly type drop hammer test system of assembly pulley amplification accelerating type can improve the reliability of experimental range of application and experimental test result. The method adopts a group of fixed pulleys and a movable pulley block to lift the heavy block, releases the heavy block to generate acceleration when reaching the required height, and drives a sliding platform horizontally placed on a guide rail and an impact loading module fixed on the sliding platform through a steel strand to impact an impacted object module, thereby realizing the simulation of collision and impact experiments. The utility model discloses the method can realize under the not big condition of pouring weight drop that the acceleration of assaulting the loading module enlargies through the figure of adjustment assembly pulley, simple and convenient and high-efficient striking and impact test of implementing. And simultaneously, the utility model discloses an assembly pulley braced frame and guide rail are removable member, conveniently assemble and implement the experiment on different places.

Description

Pulley block amplification acceleration type assembled drop hammer test system
Technical Field
The utility model relates to an impact test device for structural component especially relates to an assembly pulley is enlarged with higher speed formula and can be assembled type drop hammer test system.
Background
The test problem of impact collisions is often involved both in the field of civil engineering and in the field of vehicle manufacture. For civil and structural engineering, the mechanical properties and the capabilities of vertical stressed components such as structural columns, walls and the like under impact concern the whole structure and the corresponding personal and property safety. For the field of vehicle manufacturing, such as collision between automobiles and road and bridge protection mechanisms, the collision is also an important problem concerning the personal and property safety of society at present. Therefore, the performance research and test of the structural component under the impact load are very important.
At present, when a collision impact performance test of a large structure and a member is carried out, a device generally used is a drop hammer impact test system. The main working principle is as follows: the hammer head is arranged on the drop hammer test frame, and is released during the test, and the hammer head does free falling motion along the installed guide rail, so that the hammer head obtains corresponding speed and kinetic energy to impact the structural member. The problems of the test device and the test mode applied to the side impact of the vertical force-bearing component such as automobile collision have the following defects:
(1) because the traditional drop hammer impact test device completely depends on the speed generated by the free falling body of the hammer head to impact a component, the final impact speed is related to the release height of the drop hammer, but the drop hammer test system device has limited height, so that the impact test with higher speed cannot be carried out. The automobile crash test and the side impact test of the vertically stressed member are generally high-speed impact tests, which are determined by the practical application situation of research. Such as vehicle impact piers or high speed guardrails, are typically found on highways, and the speed per hour of an impacting vehicle can exceed 100km/h upon impact. If a conventional drop hammer impact test device is used at this speed, the drop hammer release height will reach more than 38 meters, which is obviously difficult to satisfy.
(2) The method for carrying out lateral impact on a structural member by using a traditional drop hammer device is generally to transversely fix the structural member right below a hammer head, so that the purpose of testing the lateral impact can be achieved. However, this approach also has certain problems: first, this type of impact does not completely simulate the state of an actual structural member being subjected to a lateral impact, and the transverse member cannot apply an axial force in the axial direction, nor can it simulate boundary constraints on the two ends of the member that actually come into contact. Secondly, when the traditional drop hammer impacts the structural member, the gravity acceleration exists in the impact direction, so that the secondary collision of the impact object can be caused, and the gravity acceleration of the impact object in the actual situation is not along the direction of the structural member.
Therefore, the conventional drop hammer impact system has problematic drawbacks and a decrease in test reliability in terms of simulating an automobile collision and a structural member side collision. In addition, the simulation of a collision with a car or other vehicle is also performed using a model of a real vehicle accelerating the vehicle through a ramp or a special acceleration runway. These facilities often require large test sites or proprietary equipment that is expensive to manufacture and maintain.
Disclosure of Invention
An object of the utility model is to provide an it can assemble type drop hammer test system to prior art not enough to provide an assembly pulley enlarges with higher speed.
The purpose of the utility model is realized through the following technical scheme: a pulley block amplification acceleration type assembled drop hammer test system comprises a rail, a sliding platform, an impact object, a cable, a test component, a sensor, a bottom steel beam, a four-column frame, a pulley block, a steering pulley, a drop hammer and a counter-force support; the track, the test component, the four-column frame, the steering pulley and the counter-force support are all arranged on the bottom steel beam; the counter-force support is fixedly connected with the four-column frame; the impact object is fixedly connected with the sliding platform, and the sliding platform is connected with the track in a sliding manner; the test component is positioned between the impact object and the four-column frame; one end of the sensor is connected with the test component, and the other end of the sensor is connected with the four-column frame; the pulley block consists of a fixed pulley and a movable pulley, the fixed pulley is arranged on a cross beam at the top of the four-column frame, and the drop hammer is hung on the movable pulley; one end of the cable is connected with the sliding platform, and the other end of the cable passes through the steering pulley after being matched with the unhooking device, is inserted and wound on the fixed pulley and the movable pulley of the pulley block, and is fixedly connected with the last fixed pulley of the pulley block; the unhooking device is positioned between the sliding platform and the test component.
Further, the distance between the unhooking device and the impacted surface of the test component is not less than the distance between the joint of the sliding platform and the cable and the impacted surface of the impact object.
Furthermore, the system also comprises a bottom fixed pulley fixed on the bottom steel beam, one end of the mooring rope is connected with the sliding platform, and the other end of the mooring rope passes through the steering pulley and the bottom fixed pulley in sequence after being matched with the unhooking device, then is penetrated and wound on the fixed pulley and the movable pulley of the pulley block, and is fixedly connected with the last fixed pulley of the pulley block.
Furthermore, the pulley block consists of four fixed pulleys and two movable pulleys.
Further, there are three diverting pulleys.
The utility model has the advantages that: the utility model relates to an assembly pulley enlarges formula can assemble type drop hammer test system with higher speed utilizes the basic mechanics principle, under the condition that does not need too much increase experimental space and utilize other propulsion units, effectively improves the impact object impact velocity and simulates actual collision impact velocity for the simulation is more convenient and reliable such as experiments such as car and structures collision.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, a rail 1, a sliding platform 2, an impact object 3, a cable 5, a test component 4, a sensor 6, a bottom steel beam 7, a four-column frame 8, a pulley block 9, a diverting pulley 10, a unhooking device 11, a drop hammer 12 and a counter-force support 13.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1, the utility model discloses acceleration-type drop hammer impact system is enlargied to assembly pulley includes track 1, sliding platform 2, impact object 3, hawser 5, test component 4, sensor 6, bottom girder steel 7, four post frames 8, assembly pulley 9, diverting pulley 10, drop hammer 12, counter-force support 13 and bottom fixed pulley.
The counter-force support 13 is fixed on the non-impacted side of the four-column frame 8 by welding or bolt connection, and forms a self-balancing counter-force system with the four-column frame 8, and the self-balancing counter-force system is installed on the bottom steel beam 7 by bolts. The impact object 3 is fixed at the front part of the sliding platform 2 in a welding or bolt connection mode, and the impact object and the sliding platform form an impact source together; the sliding platform 2 is placed on the track 1; the track 1 is fixed on the bottom steel beam 7 through section steel, and the impact collision height can be adjusted by changing the height of the section steel. The test component 4 is an impacted object, the bottom of the test component is fixed on a bottom steel beam 7 through profile steel and is positioned between the impacted object 3 and the four-column frame 8; the sensor 6 is a force sensor or a displacement sensor, one end of which is connected with the top of the test component 4, and the other end of which is connected with the four-column frame 8, and is used for measuring the impact force or the displacement generated by the top of the test component 4 during impact collision.
The pulley block 9 is installed on a cross beam at the top of the four-column frame 8 through bolts; the pulley block 9 is composed of a plurality of fixed pulleys and movable pulleys, the fixed pulleys of the pulley block 9 are fixed on a top beam of the four-column frame 8, the number of the movable pulleys of the pulley block 9 is n, the drop hammer 12 falls at a distance of h when the cable 5 is separated from the sliding platform 2 by the unhooking device 11, and the drop hammer 12 is at a speed of h
Figure BDA0002385589220000031
According to the principle of the pulley block working motion, when one movable pulley is added in the pulley block 9, the movement speed of the sliding platform 2 is correspondingly increased by two times by driving the cable 5, and the ideal test speed is
Figure BDA0002385589220000032
The number of the movable pulleys is determined according to the test speed of the test requirement, the fixed pulleys are arranged according to the number of the movable pulleys, and the number of the fixed pulleys is not less than n + 1. The impact loading tests with different speeds are realized by adjusting the falling distance of the drop hammer 12 to be h when the cable 5 is separated from the sliding platform 2. It should be noted here that, according to the principle of mechanical balance of the pulley block 9, the gravity of the drop hammer 12 needs to be greater than 2n times of the friction force between the sliding platform 2 and the rail 1, so that the sliding platform 2 and the impact object 3 can be driven to move by the free falling body of the drop hammer.
One end of a cable 5 is connected with the sliding platform 2, and the other end of the cable is matched with a unhooking device 11, then sequentially bypasses three steering pulleys 10 fixed on a bottom steel beam 7 and a bottom fixed pulley for guiding, is matched with a pulley block 9, and the matched part is penetrated and wound on the fixed pulley and a movable pulley and is fixedly connected with the last fixed pulley of the pulley block 9; the drop hammer 12 is hung on the movable pulley of the pulley block 9 at the same time. The unhooking device 11 is arranged on the bottom steel beam 7 and is positioned between the sliding platform 2 and the test member 4; the distance between the unhooking device 11 and the impact surface of the test component 4 is not less than the distance between the joint of the sliding platform and the cable 5 and the impact surface of the impact object 3.
The utility model discloses assembly pulley enlargies formula of speeding drop hammer impact system's working process does: releasing the drop hammer 12 to enable the drop hammer to drop downwards, driving the cable 5 to move through the pulley block 9 and the diverting pulley 10, and then pulling the sliding platform 2 and the impact object 3 to impact and collide towards the test component 4 along the track 1; the front unhooking device 11 breaks the cable 5 away from the sliding platform 2 at the moment of impact so as to prevent the cable system from being damaged; after the impact object 3 collides with the test component 4, the sensor 5 directly measures the impact force or displacement applied to the top of the test component 4; meanwhile, a self-balancing counter force system consisting of the four-column frame 8 and the counter force supports 13 provides counter force support for impact collision, and impact experiment simulation is realized.
Furthermore, the utility model discloses impacter 3 can change the shape according to experimental demand, can set up to simulation automobile frame when the car-post collides, or actual automobile model, or other delivery vehicles and collision object model. Additional door frames can be mounted on the bottom steel beams 7 at the test members 4, which can apply axial forces or other constraints to the test members, so that the test can be more realistic to obtain more reliable test results. The utility model discloses adopt the bolt when needing fixed connection between each part, the detachable design is convenient for assemble at different places and test.

Claims (5)

1. A pulley block amplified acceleration type assembled drop hammer test system is characterized by comprising a track (1), a sliding platform (2), an impact object (3), a cable (5), a test component (4), a sensor (6), a bottom steel beam (7), a four-column frame (8), a pulley block (9), a turning pulley (10), a drop hammer (12) and a counter-force support (13); wherein the track (1), the test component (4), the four-column frame (8), the steering pulley (10) and the counter force support (13) are all arranged on the bottom steel beam (7); the counter-force support (13) is fixedly connected with the four-column frame (8); the impact object (3) is fixedly connected with the sliding platform (2), and the sliding platform (2) is connected with the track (1) in a sliding manner; the test component (4) is positioned between the impact object (3) and the four-column frame (8); one end of the sensor (6) is connected with the test component (4), and the other end of the sensor is connected with the four-column frame (8); the pulley block (9) consists of a fixed pulley and a movable pulley, the fixed pulley is arranged on a cross beam at the top of the four-column frame (8), and the drop hammer (12) is hung on the movable pulley; one end of the cable (5) is connected with the sliding platform (2), and the other end of the cable is matched with the unhooking device (11), passes through the diverting pulley (10), is inserted and wound on the fixed pulley and the movable pulley of the pulley block (9), and is fixedly connected with the last fixed pulley of the pulley block (9); the unhooking device (11) is positioned between the sliding platform (2) and the test member (4).
2. The pulley block amplified acceleration type assemblable drop hammer test system according to claim 1, wherein the distance between the unhooking device (11) and the impact surface of the test member (4) is not less than the distance between the connection of the sliding platform and the cable (5) and the impact surface of the impact object (3).
3. The pulley block amplified acceleration type assemblable drop hammer test system according to claim 1, further comprising a bottom fixed pulley fixed on the bottom steel beam (7), wherein the cable (5) has one end connected to the sliding platform (2) and the other end engaged with the unhooking device (11), and then sequentially passes through the diverting pulley (10) and the bottom fixed pulley, and then is inserted and wound on the fixed pulley and the movable pulley of the pulley block (9), and finally is fixedly connected with the last fixed pulley of the pulley block (9).
4. The pulley block amplified acceleration type assemblable drop hammer test system according to claim 1, wherein the pulley block (9) is composed of four fixed pulleys and two movable pulleys.
5. Pulley block amplified acceleration type assemblable drop hammer test system according to claim 1, characterized in that said diverting pulleys (10) are three in number.
CN202020177484.8U 2020-02-17 2020-02-17 Pulley block amplification acceleration type assembled drop hammer test system Active CN211477563U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021164391A1 (en) * 2020-02-17 2021-08-26 浙江大学 Pulley block amplification-acceleration-type assembly-type drop hammer test system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021164391A1 (en) * 2020-02-17 2021-08-26 浙江大学 Pulley block amplification-acceleration-type assembly-type drop hammer test system

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