Ribbed metal plate bolt extrusion type energy dissipater and design method

Abstract

The invention discloses a ribbed metal plate plug pin extrusion type energy dissipater for a flexible protection system and a design method. The ribbed metal plate plug pin extrusion type energy dissipater comprises ribbed metal plates, side plates with plug pins, base plates, lug plates and high-strength bolts. Holes are formed in the two ends of the ribbed metal plate and used for being connected with a steel wire rope or a shackle for forward and reverse traction. Round-head bolts are arranged on the inner sides of the side plates with the bolts, the bolts are matched with grooves between ribs of the ribbed metal plate, the ribbed metal plate is clamped between the upper side plate and the lower side plate with the bolts, and the bolts are used for being inserted into the grooves and extruding the ribs. The base plates are arranged in gaps between the two ends of the side plates with the bolts and the ribbed metal plates; the lug plate is fixed on the side plate with the bolt, and an opening is formed in the lug plate and used for being connected with a steel wire rope or a shackle; the high-strength bolts penetrate through the side plates with the plug pins and the base plates and are fixed, and a channel for traction of the ribbed metal plate is formed through combination. The energy dissipation device is high in energy dissipation capacity and can be repeatedly used, and the performance and the repeated use frequency of the energy dissipation device in an existing flexible protection system are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of line traffic safety protection facilities, and in particular relates to a ribbed metal plate latch extrusion type energy absorber and a design method thereof. Background Art

[0002] Geological disasters such as rockfall, debris flow, mudslide, etc. pose a huge threat to transportation routes, infrastructure and the lives of residents, and they must be effectively protected in an efficient and stable manner. At present, the flexible protection system has made remarkable achievements in the management of slope geological disasters. It has been widely used for its high protection level, wide application environment and high structural utilization rate. Energy absorbers play a key role in the flexible protection system, and their energy consumption accounts for up to 60%-80% of the system's energy consumption. Many domestic and foreign specifications regard the repairability of flexible protection systems as an important evaluation indicator.

[0003] At present, the flexible protection system often uses a decompression ring, which has limited energy consumption capacity and can only be used once. As a result, the layout of the energy absorber in the current flexible protection system is complicated and the subsequent replacement of the energy absorber is huge, which brings great inconvenience to post-disaster maintenance. Landslides and rockfall disasters frequently occur in the dangerous mountainous areas in western my country, and the disaster energy level often reaches tens of megajoules, seriously threatening the western transportation arteries. Therefore, improving the energy consumption performance of the energy absorber in the flexible protection system and realizing the reuse of the energy absorber are of great significance to further improve the protection level of the flexible protection system and rapid post-disaster repair. Summary of the invention

[0004] The object of the present invention is to provide a ribbed metal plate latch extrusion type energy absorber and a design method thereof, which significantly improve the energy dissipation capacity and the number of repeated uses of the existing energy absorber.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A ribbed metal plate latch extrusion type energy absorber, used in a flexible protection system, comprising a ribbed metal plate, a latch side plate, a backing plate, an ear plate and high-strength bolts;

[0007] The ribbed metal plates have holes at both ends for connecting wire ropes or shackles for forward and reverse traction;

[0008] A round-headed latch is provided on the inner side of the latch side plate, and the latch is adapted to the groove between the ribs of the ribbed metal plate. The upper and lower side plates with latches sandwich the ribbed metal plate in the middle, and the latch is used to be inserted into the groove and squeeze the ribs.

[0009] The pad is arranged at the gap between the side plate with the latch and the two ends of the ribbed metal plate;

[0010] The ear plate is fixed to the side plate with the latch, and the ear plate is provided with an opening for connecting a wire rope or a shackle;

[0011] High-strength bolts pass through the side plates with latches and the pads and are fixed, forming a channel for traction of the ribbed metal plates.

[0012] Furthermore, when impacted, the external load pulls the ribbed metal plate, and the pins of the side plates with pins squeeze the ribs of the ribbed metal plate to tilt and deform outward, while friction and slippage are generated between the pins and the ribs to jointly dissipate energy.

[0013] Furthermore, the latch with the latch side plate is hardened to improve its hardness and wear resistance, ensuring that the latch does not undergo obvious deformation or failure during the stress process.

[0014] Furthermore, the ribbed metal plate is made of aluminum alloy or low-carbon steel with different yield strengths according to the energy dissipation capacity; and the side plate with latch is made of high-strength steel or die steel.

[0015] Furthermore, after the ribbed metal plate consumes energy in the forward traction, it can be reused by replacing the side plate with a latch having a complementary latch position and reversely combining the ribbed metal plate.

[0016] Furthermore, the rib spacing of the ribbed metal plate is fixed, the pin diameter of the side plate with the pin is 1 to 3 mm larger than the rib spacing, and the greater the difference between the pin diameter and the rib spacing, the greater the energy dissipation capacity.

[0017] Furthermore, the rib height and width of the ribbed metal plate are determined by the working tension of the energy absorber required by the flexible protection system. The larger the rib height and width, the stronger the energy absorption capacity.

[0018] Furthermore, both ends of the ribs of the ribbed metal plate are processed with wedge-shaped openings at the entrance of the latch.

[0019] Furthermore, the latch is arranged on one side of the side plate with the latch, at the entrance of the rib.

[0020] The present application also claims protection for a design method of a ribbed metal plate latch extrusion type energy absorber as described above, comprising the following steps:

[0021] Step 1: Determine the maximum energy consumption capacity E of the energy consumer required for the flexible protection system m ;

[0022]

[0023] in, is the average pulling force of the energy absorber, S m is the length of the rib of the ribbed metal sheet;

[0024] Step 2: Determine the reaction force f that can be provided by the extrusion friction between a single pin and the ribs on both sides. Its value can be obtained according to the following approximate expression:

[0025] f=0.09σ y +3.81H+3.44W+8.96Δ-51.23

[0026] Among them, σ y is the yield strength of the ribbed metal plate, H is the rib height, W is the rib width, and Δ is the difference between the pin diameter and the rib spacing;

[0027] Step 3: Design the number n of ribs of the ribbed metal plate;

[0028]

[0029] Among them, the specifications of the holes at both ends of the ribbed metal plates, the ear plates and the high-strength bolts should meet the tensile, shear and structural requirements of the energy absorber.

[0030] Compared with the prior art, the beneficial technical effects of the present invention are:

[0031] The ribbed metal plate latch extrusion type energy absorber described in the present invention has the advantages of simple structure, convenient processing, high energy absorption and reusability of the ribbed metal plate of the energy absorbing body, and the number of ribs of the ribbed metal plate can be increased or decreased according to the needs of the flexible protection system, so as to provide a wider range of working loads. The working load of the present invention is stable and large under high-speed impact, which can effectively reduce the layout of the energy absorber and simplify the configuration of the energy absorbing components of the flexible protection system. After being subjected to impact traction, the ribbed metal plate latch extrusion type energy absorber can be reused by unscrewing the high-strength bolts, replacing the latch side plate with complementary latch position, and reversely combining the ribbed metal plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a structural schematic diagram of a ribbed metal plate latch extrusion type energy absorber for a flexible protection system of the present invention;

[0034] Figure 2 It is a structural explosion diagram of a ribbed metal plate latch extrusion type energy absorber for a flexible protection system of the present invention during forward stretching;

[0035] Figure 3 It is a structural explosion diagram of a ribbed metal plate latch extrusion type energy absorber for a flexible protection system of the present invention during reverse stretching;

[0036] Figure 4 It is a deformation diagram of a ribbed metal plate before and after operation of a ribbed metal plate latch extrusion type energy absorber for a flexible protection system of the present invention;

[0037] In the figure: 1- ribbed metal plate, 2- side plate with latch, 3- pad, 4- ear plate, 5- high-strength bolt, 501- nut, 502- bolt. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0040] like Figure 1-4 As shown, the present invention provides a ribbed metal plate latch extrusion type energy absorber for a flexible protection system, comprising a ribbed metal plate 1, a latch side plate 2, a pad 3, an ear plate 4, and a high-strength bolt 5.

[0041] The ribbed metal plate 1 has holes at both ends for connecting a steel wire rope or a shackle for forward and reverse traction; the inner side of the latch side plate 2 has a round head latch, which is aligned with the groove between the ribs of the ribbed metal plate 1 and is used to squeeze the metal plate ribs; the pad 3 is between the latch side plates 2; the ear plate 4 has holes for connecting a steel wire rope or a shackle, which is fixed on the latch side plate 2; the high-strength bolt 5 passes through the latch side plate 2 and the pad 3, and is combined to form a channel for traction of the ribbed metal plate 1. The energy dissipator is connected to the flexible protection system through the ribbed metal plate 1 and the ear plate 4. The high-strength bolt 5 includes a nut 501 and a bolt 502.

[0042] like Figure 4 As shown in the deformation diagram, when impacted, the steel wire rope pulls the ribbed metal plate 1, and the round-headed latch with the latch side plate 2 squeezes the ribs of the ribbed metal plate 1 to tilt outward and deform, and the friction and sliding between the latch and the ribs realize energy dissipation.

[0043] Example

[0044] This embodiment intends to design a ribbed metal plate bolt extrusion type energy absorber with an energy dissipation capacity of 120 kJ and a ribbed metal plate rib length of 1 m. The ribbed metal plate is made of Q235 steel, and the bolt side plate is made of high-strength steel.

[0045] Design the energy absorber according to the design steps:

[0046] First, the maximum travel S of the energy consumer is determined m For 1m, according to the energy consumption capacity calculation formula:

[0047]

[0048] The average working tension of the energy absorber is about 120kN.

[0049] Secondly, the rib height is 6mm, the width is 6mm, the spacing is 8mm and the pin diameter is 10mm. The working load is calculated by the approximate expression:

[0050] f=0.09σ y +3.81H+3.44W+8.96Δ-51.23

[0051] It was found that a single pin can provide a reaction force of about 31.34 kN. The finite element calculation result is 30.40 kN, with an error of 3.09%, indicating that the approximate calculation formula has good calculation accuracy.

[0052] Third, given the average working load of the required energy absorber and the reaction force that a single pin can provide, the equation is:

[0053]

[0054] Determine that the number of ribs required is approximately 8.

[0055] Finally, according to the structural requirements, the side panels with latches are designed according to the corresponding positions of the rib grooves of the ribbed metal plate.

[0056] After the first operation, the ribs are squeezed and deformed outward, and the deformation encroaches on the moving channel of the pin during the second reverse stretching. Therefore, the working load during the second operation will be strengthened to a certain extent, and the specific strengthening coefficient is obtained by experiment.

[0057] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A ribbed metal plate latch extrusion type energy absorber, characterized in that: Used in a flexible protection system, comprising a ribbed metal plate (1), a side plate with a latch (2), a backing plate (3), an ear plate (4) and a high-strength bolt (5); The ribbed metal plate (1) is provided with holes at both ends for connecting a wire rope or a shackle for forward and reverse traction; A round-headed latch is provided on the inner side of the latch side plate (2), and the latch is adapted to fit into the groove between the ribs of the ribbed metal plate (1). The upper and lower latch side plates (2) sandwich the ribbed metal plate (1) in the middle, and the latch is used to insert into the groove and squeeze the ribs. The pad (3) is arranged at the gap between the side plate with the latch (2) and the two ends of the ribbed metal plate (1); The ear plate (4) is fixed on the side plate (2) with a latch, and the ear plate (4) is provided with an opening for connecting a wire rope or a shackle; The high-strength bolts (5) pass through the side plates with latches (2) and the backing plates (3) and are fixed thereto, so as to form a channel for the ribbed metal plates (1) to be pulled.

2. A ribbed metal plate latch extrusion type energy absorber as claimed in claim 1, characterized in that: When impacted, the external load pulls the ribbed metal plate (1), and the latch pins of the latch pin side plate (2) squeeze the ribs of the ribbed metal plate (1) to tilt and deform outwards, while friction and slippage are generated between the latch pins and the ribs to dissipate energy.

3. A ribbed metal plate bolt extrusion type energy absorber as claimed in claim 1, characterized in that: The latch pin of the latch pin side plate (2) is hardened to improve its hardness and wear resistance, thereby ensuring that the latch pin does not undergo obvious deformation or failure during the stress process.

4. A ribbed metal plate bolt extrusion type energy absorber as claimed in claim 1, characterized in that: The ribbed metal plate (1) is made of aluminum alloy or low-carbon steel with different yield strengths according to the energy dissipation capacity; the side plate with latch (2) is made of high-strength steel or die steel.

5. The ribbed metal plate bolt extrusion type energy absorber according to claim 1, characterized in that: After the ribbed metal plate (1) consumes energy through forward traction, it can be reused by replacing the side plate (2) with a latch having a complementary latch position and combining the ribbed metal plate (1) in reverse.

6. The ribbed metal plate bolt extrusion type energy absorber according to claim 1, characterized in that: The rib spacing of the ribbed metal plate (1) is fixed, the bolt diameter of the bolt side plate (2) is 1 to 3 mm larger than the rib spacing, and the greater the difference between the bolt diameter and the rib spacing, the greater the energy dissipation capacity.

7. A ribbed metal plate bolt extrusion type energy absorber as claimed in claim 1 or 6, characterized in that: The rib height and width of the ribbed metal plate (1) are determined by the working tension of the energy absorber required by the flexible protection system. The larger the rib height and width, the stronger the energy absorption capacity.

8. A ribbed metal plate bolt extrusion type energy absorber as claimed in claim 1 or 7, characterized in that: Both ends of the ribs of the ribbed metal plate (1) are processed into wedge-shaped openings at the entrance of the latch.

9. The ribbed metal plate bolt extrusion type energy absorber according to claim 1, characterized in that: The latch is arranged on one side of the latch side plate (2) and is located at the entrance of the rib.

10. The design method of a ribbed metal plate bolt extrusion type energy absorber as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Determine the maximum energy consumption capacity E of the energy consumer required for the flexible protection system m ; in, is the average pulling force of the energy absorber, S m is the length of the ribs of the ribbed metal plate (1); Step 2: Determine the reaction force f that can be provided by the extrusion friction between a single pin and the ribs on both sides. Its value can be obtained according to the following approximate expression: f=0.09σ y +3.81N+3.44W+8.96E-51.23 Among them, σ y is the yield strength of the ribbed metal plate (1), H is the rib height, W is the rib width, and Δ is the difference between the pin diameter and the rib spacing; Step 3: Design the number n of ribs of the ribbed metal plate (1); The specifications of the holes at both ends of the ribbed metal plate (1), the ear plate (4) and the high-strength bolts (5) should meet the tensile, shear and structural requirements of the energy absorber.

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