Reinforcing steel bar strengthening device

Abstract

The reinforcing steel bar strengthening device comprises a shell, a strengthening execution unit and a driving mechanism, and a machine frame is installed in the shell; the strengthening execution unit is mounted on the rack, and the strengthening execution unit is used for fixing a titanium-containing steel bar to be strengthened and is connected with the driving mechanism; the driving mechanism is used for driving the strengthening execution unit to radially extrude the strengthening preset part of the titanium-containing steel bar in the direction perpendicular to the axis of the steel bar; the radial extrusion mode of the strengthening execution unit is controlled through the driving mechanism, the extremely high cold hardening effect and residual compressive stress can be introduced into the specific area of the end of the steel bar, and therefore the tensile strength, the yield strength and the fatigue strength of the local area are remarkably improved; therefore, the strength of the treated end part of the steel bar (namely the rolled thread and the part connected with the sleeve) is higher than that of the steel bar base material, so that when a tensile test is carried out or an actual impact load is borne, the fracture cannot occur in a reinforced area or a sleeve connecting part.

Description

Technical Field

[0001] This invention relates to the field of building technology, and more particularly to a steel reinforcement device. Background Technology

[0002] As a vital national energy infrastructure, the safety of nuclear power plants, particularly the safety of the nuclear island structure, is of paramount importance. The design must consider extreme unforeseen events, including aircraft impacts. An aircraft impact is an extremely destructive dynamic load that, when acting on a concrete structure, releases enormous kinetic energy in an extremely short time (milliseconds). This instantaneous and massive impact load far exceeds conventional static loads, leading to rapid brittle failure of the concrete structure, such as crushing, spalling, and penetration, thus posing a significant threat to the integrity and safety of the nuclear island structure.

[0003] As the skeleton of a concrete structure, the performance of reinforcing steel directly determines the structure's impact resistance. Strengthening the steel is particularly important at critical connection points and stress concentration areas. To improve the strength, toughness, and fatigue resistance of these components, cold working is commonly used to induce plastic deformation and work hardening on the surface of the steel bars, thereby forming a reinforced layer.

[0004] Currently, the mainstream steel reinforcement techniques mainly include roll forming and axial necking. Roll forming involves rolling the surface of the steel bar with a die to induce plastic deformation. While this method can improve surface hardness to some extent, the pressure penetration depth is limited, making it difficult to form a uniform, deep compressive stress distribution in the radial direction of the steel bar. Furthermore, it easily generates microcracks on the surface, becoming sources of fatigue. Axial necking, on the other hand, involves axially compressing the steel bar with a die to induce plastic deformation. Although this method can improve the overall strength of the steel bar, it significantly reduces its ductility and toughness. This causes the steel bar to transform from a ductile material to a brittle material when subjected to impact loads, making it unable to absorb the enormous impact energy through plastic deformation, thus making it prone to sudden brittle fracture.

[0005] Furthermore, to meet the extremely high performance requirements of nuclear island structures, the reinforcing steel used is typically high-performance micro-alloyed special steel, among which titanium-containing steel is considered an ideal choice due to its excellent comprehensive performance. However, existing rolling and stretching processes have not been optimized for the microscopic characteristics of such titanium-containing steel, and its strengthening potential has not been fully realized. In fact, its original excellent performance may even be compromised due to process mismatch.

[0006] Furthermore, reinforcing bars are typically connected by rolling threads at the ends and using sleeves. When tensile tests are conducted on joints of reinforcing bars treated with conventional rolling processes, the fracture point often occurs at the root of the thread or at the sleeve connection. This indicates that the connection becomes a weak link in the entire load-bearing chain, failing to meet the safety design principle of "strong connection, weak component," which requires the joint strength to be no less than the strength of the reinforcing bar itself. Summary of the Invention

[0007] The technical problem solved by the present invention is to provide a steel reinforcement device.

[0008] This application provides a steel reinforcement device, comprising,

[0009] The outer casing contains a frame;

[0010] A strengthening execution unit is installed on the frame. The strengthening execution unit is used to fix the titanium-containing steel bar to be strengthened and is connected to the drive mechanism.

[0011] The driving mechanism is used to drive the strengthening execution unit to radially compress the pre-set strengthening part of the titanium-containing steel bar in a direction perpendicular to the steel bar axis.

[0012] Furthermore, the drive mechanism includes a hydraulic cylinder, a servo electric cylinder, or a pneumatic cylinder.

[0013] Furthermore, the enhanced execution unit includes two sets of extrusion molds arranged vertically opposite each other. Arc-shaped grooves are formed on the opposite surfaces of the two extrusion molds, and one of the arc-shaped grooves moves to engage with the other arc-shaped groove to form an extrusion space.

[0014] Furthermore, the frame is provided with mounting slots, and the drive mechanism is fixed to one end of the mounting slots. One of the extrusion dies is connected to the drive part of the drive mechanism through a fixing block and moves in a direction perpendicular to the axial direction of the reinforcing bar under the drive of the drive mechanism. The other extrusion die is fixed to the other end of the mounting slots.

[0015] Furthermore, the extrusion die is externally connected to a die base, and the die base connected to the fixing block is slidably connected to the mounting slot.

[0016] Furthermore, the steel reinforcement device also includes a support adjustment mechanism fixed to the frame, the support adjustment mechanism comprising,

[0017] There are two support bases, both L-shaped, respectively located on both sides of the mounting slot and on the side of the frame closer to the opening of the outer shell. The support bases are provided with strip holes, through which screws are passed to connect to the frame.

[0018] A support shaft is connected between the two support seats;

[0019] The support roller is rotatably connected to the support shaft via a bearing.

[0020] Furthermore, the support roller consists of an integrally formed and coaxially arranged rotating shaft and two support blocks. The two support blocks are both hollow frustum-shaped and are respectively arranged opposite each other on the left and right sides of the rotating shaft. The end face with the smaller radius of the support block is connected to the rotating shaft. The outer surfaces of the two support blocks and the rotating shaft together form a support groove.

[0021] Furthermore, the steel reinforcement device also includes a blocking mechanism located on the side of the frame away from the support adjustment mechanism. The blocking mechanism includes a baffle seat and a baffle. The two ends of the baffle seat are respectively connected to the two sides of the mounting slot, and the baffle seat is provided with an adjustment hole. The baffle is disc-shaped, with one end connected to the adjustment hole through a connecting shaft, and the other end facing the extrusion space.

[0022] Furthermore, the bottom of the housing is connected to multiple omnidirectional casters.

[0023] Furthermore, at least two universal lifting rings are provided on the opening side of the housing and on the opposite end face of the opening side.

[0024] Compared with the prior art, the present invention, by controlling the radial extrusion of the strengthening execution unit through the drive mechanism, can introduce extremely high cold work hardening effect and residual compressive stress in a specific area at the end of the steel bar, thereby significantly improving the tensile strength, yield strength and fatigue strength of the local area. This makes the strength of the treated steel bar end (i.e. the part where the thread is rolled and the connecting sleeve is connected) higher than that of the steel bar base material itself, ensuring that fracture will not occur in the strengthened area or at the sleeve connection when tensile tests are conducted or when subjected to actual impact loads. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0026] Figure 1 This is an overall schematic diagram of the steel reinforcement device of the present invention;

[0027] Figure 2 This is a top view of a cross-sectional view of the steel reinforcement device of the present invention;

[0028] Figure 3 This is a partial structural diagram of the internal structure of the steel reinforcement device of the present invention;

[0029] Figure 4 This is a partial structural diagram of the internal structure of the steel reinforcement device of the present invention from another angle;

[0030] Figure 5 This is a schematic diagram of the extrusion die of the present invention;

[0031] Figure 6 This is a schematic diagram of the mold base of the present invention;

[0032] Figure 7 This is a schematic diagram of the supporting roller structure of the present invention;

[0033] Figure 8 This is a diagram showing the effect of steel bars being compressed by the steel bar strengthening device of this invention.

[0034] The reference numerals in the attached figures include:

[0035] 1. Frame; 2. Frame; 3. Reinforced execution unit; 31. Extrusion die; 32. Arc groove; 33. Fixing block; 34. Die seat; 4. Drive mechanism; 5. Mounting slot; 6. Support adjustment mechanism; 61. Support base; 62. Strip hole; 63. Support shaft; 64. Support roller; 641. Rotating shaft; 642. Support block; 643. Support groove; 65. Bearing; 7. Blocking mechanism; 71. Baffle seat; 72. Baffle; 73. Adjustment hole; 74. Connecting shaft; 8. Universal caster; 9. Universal lifting ring; 10. Hydraulic station. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] like Figure 1 , Figure 2 As shown, the rebar strengthening device of the present invention includes a housing 1, a strengthening execution unit 3, and a driving mechanism 4; wherein, a frame 2 is installed inside the housing 1, and multiple universal casters 8 are connected to the bottom, and at least two universal lifting rings 9 are provided on the open side and the opposite end face of the open side of the housing 1; the strengthening execution unit 3 is installed on the frame 2, and the strengthening execution unit 3 is used to fix the titanium-containing rebar to be strengthened and is connected to the driving mechanism 4; the driving mechanism 4 is used to drive the strengthening execution unit 3 to radially compress the titanium-containing rebar at the preset strengthening part in a direction perpendicular to the rebar axis.

[0038] In this embodiment, the drive mechanism 4 controls the strengthening execution unit 3 to radially compress, which can achieve this in a specific area at the end of the rebar (such as...). Figure 8The middle position shown (i.e., the right side of the threaded section) introduces extremely high cold work hardening effect and residual compressive stress, thereby significantly improving the tensile strength, yield strength and fatigue strength of this local area. This makes the strength of the treated steel bar end (i.e. the part where the thread is rolled and the connecting sleeve is) higher than that of the steel bar base material itself, ensuring that fracture will not occur in the reinforced area or at the sleeve connection when tensile tests are conducted or when subjected to actual impact loads.

[0039] Specifically, this application ingeniously integrates the frame 2, the reinforcement execution unit 3, and the drive mechanism 4 into a housing 1 with swivel casters 8, forming a complete and mobile working platform. This breaks the geographical limitations of traditional large-scale fixed reinforcement equipment, allowing high-strength steel reinforcement operations to be carried out anywhere, including construction sites, steel processing sheds, or even inside nuclear islands, rather than being confined to factory workshops. The swivel lifting rings 9 on the device provide great flexibility for transport in complex industrial environments, enabling the device to be moved from the bottom using forks and swivel casters 8, or lifted and transported from the top using cranes, tower cranes, or other equipment. This is crucial for scenarios like nuclear power plant construction sites where space is limited, obstacles are numerous, and vertical transportation is required. Of course, the front of the housing 1 has an opening with a door and an observation window for observing the reinforcement process. Both sides of the housing 1 have maintenance doors for inspecting and maintaining the internal mechanisms, and one of the maintenance doors has a heat dissipation vent.

[0040] Specifically, the strengthening process parameters of the device of the present invention, such as extrusion pressure and extrusion speed, can be precisely controlled according to the material properties of the steel bars (such as fine grain strengthening and precipitation strengthening), providing the highest level of material performance guarantee for nuclear safety critical equipment. Of course, although the device of this application is designed for titanium-containing steel bars, it is also applicable to other types of steel bars, which can be adjusted according to the material properties of the steel bars.

[0041] In some embodiments, such as Figures 2-4 As shown, the drive mechanism 4 includes a hydraulic cylinder, a servo electric cylinder or a pneumatic cylinder, preferably a hydraulic cylinder, and a hydraulic station 10 is installed inside the housing 1 on the side opposite to the outlet.

[0042] In this embodiment, a hydraulic cylinder is preferred, which has an extremely high power-to-weight ratio and output force density, and can provide a continuous and stable huge thrust, meeting the high extrusion pressure requirements for deep extrusion strengthening of titanium-containing steel bars. The hydraulic station 10 can precisely control the flow and pressure of the hydraulic oil, thereby enabling continuous and smooth stepless adjustment of the extrusion speed and output force of the hydraulic cylinder. In addition, placing the hydraulic station 10 in the outer shell 1 constitutes a completely independent and self-driven strengthening workstation, which not only eliminates the dependence on fixed external hydraulic sources (such as large central hydraulic stations), but also, combined with the omnidirectional casters 8 at the bottom and the omnidirectional lifting rings 9 at the top, realizes "power and execution integration" mobile operation.

[0043] In some embodiments, such as Figures 3-6 As shown, the strengthening execution unit 3 includes two sets of extrusion dies 31 arranged vertically opposite each other. Each set of extrusion dies 31 has an arc-shaped groove 32 formed on its opposite surface. One arc-shaped groove 32 moves to engage with the other arc-shaped groove 32 to form an extrusion space. The frame 2 is provided with mounting slots 5. The drive mechanism 4 is fixedly connected to one end of the mounting slot 5. One extrusion die 31 is connected to the drive unit of the drive mechanism 4 via a fixing block 33 and moves along a direction perpendicular to the axial direction of the reinforcing bar under the drive of the drive mechanism 4. The other extrusion die 31 is fixedly connected to the other end of the mounting slot 5. A die base 34 is externally connected to each extrusion die 31, and the die base 34 connected to the fixing block 33 is slidably connected to the mounting slot 5.

[0044] In this embodiment, since the arc-shaped groove 32 matches the shape of the reinforcing bar, when the two extrusion dies 31 are engaged under the action of the driving mechanism 4, a complete extrusion space that wraps around the reinforcing bar can be formed, ensuring that the extrusion force is applied simultaneously and evenly from all four sides of the reinforcing bar in the radial direction. In addition, one of the die seats 34 drives the extrusion die 31 inside it to slide radially along the mounting slot 5, providing precise guidance for the extrusion die 31, constraining its degree of freedom, and ensuring that it can only move in a predetermined direction perpendicular to the axis of the reinforcing bar. This design maximizes the structural rigidity and stability of the system and reduces unnecessary energy loss.

[0045] Specifically, two connecting plates are respectively provided on the two opposite end faces of the extrusion die 31. The connecting plates fix the extrusion die 31 and the die base 34 with bolts. One connecting plate fixes both to the frame 2 with bolts. The bottom of the other die base 34 is fixed to the fixing block 33 with bolts. The fixing block 33 is fixed to the output shaft of the hydraulic cylinder.

[0046] In some embodiments, such as Figure 3 , Figure 7As shown, the steel reinforcement device also includes a support adjustment mechanism 6 fixed to the frame 2. The support adjustment mechanism 6 includes two L-shaped support seats 61, a support shaft 63, and support rollers 64. The two support seats 61 are respectively located on both sides of the mounting slot 5 and on the side of the frame 2 closest to the opening of the outer casing 1. Each support seat 61 has a slotted hole 62 through which screws pass to connect to the frame 2. The support shaft 63 connects the two support seats 61 (support shaft 64). 3 is connected to the support base 61 by bolts; the support roller 64 is rotatably connected to the support shaft 63 through the bearing 65; the support roller 64 is composed of an integrally formed and coaxially arranged rotating shaft 641 and two support blocks 642. The two support blocks 642 are both hollow frustum-shaped and are respectively arranged opposite to the left and right sides of the rotating shaft 641. The end face with the smaller radius of the support block 642 is connected to the rotating shaft 641. The outer surfaces of the two support blocks 642 and the rotating shaft 641 together form a support groove 643.

[0047] In this embodiment, the support roller 64 is integrally formed by two hollow frustum-shaped support blocks 642 and a rotating shaft 641, with their outer surfaces forming a support groove 643. This unique configuration ensures that the contact between the roller and the reinforcing bar is not a line or point contact, but a highly fitted, surface-contact flexible support. The sloping surface of the frustum-shaped roller can naturally guide the reinforcing bar into the center of the support groove 643 and adaptively wrap and support the reinforcing bar during the compression process, greatly increasing the contact area and significantly reducing the pressure per unit area. Through the two L-shaped support seats 61 located on both sides of the mounting slot 5 and the strip holes 62 on them, the precise position of the entire support roller 64 group in the horizontal and vertical directions can be flexibly adjusted. This design allows the operator to precisely adjust the support point to the position most conducive to resisting compression deformation according to the actual diameter and deflection of the reinforcing bar.

[0048] In some embodiments, such as Figure 4 As shown, the steel reinforcement device also includes a blocking mechanism 7 located on the side of the frame 2 away from the support adjustment mechanism 6. The blocking mechanism 7 includes a baffle seat 71 and a baffle 72. The two ends of the baffle seat 71 are respectively connected to the two sides of the mounting slot 5 (the baffle seat 71 and the frame 2 are connected by bolts). An adjustment hole 73 is provided on the baffle seat 71. The baffle 72 is disc-shaped. One end face is connected to the adjustment hole 73 through a connecting shaft 74 (the connecting shaft 74 and the adjustment hole 73 are connected by bolts), and the other end face is arranged opposite to the extrusion space.

[0049] In this embodiment, the disc-shaped baffle 72 provides a robust and reliable mechanical barrier through direct contact between its end face and the end of the reinforcing bar. This design can effectively resist and eliminate any axial displacement of the reinforcing bar during the extrusion process, ensuring that each extrusion action occurs precisely at the preset reinforcement location. The baffle 72 is installed in the adjustment hole 73 of the baffle seat 71 through the connecting shaft 74. The fixed position of the baffle 72 on the baffle seat 71 can be quickly and flexibly adjusted according to the specific length of the reinforcing bar, thereby adapting to reinforcing bars of different lengths.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0052] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0053] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A steel reinforcement device, characterized in that, The reinforcing device for steel bars comprises a housing (1) and a frame (2) installed in the housing (1). The reinforcing device for steel bars further comprises a reinforcing execution unit (3) installed on the frame (2), the reinforcing execution unit (3) is used for fixing the steel bars to be reinforced and is connected with a driving mechanism (4). The driving mechanism (4) is used for driving the reinforcing execution unit (3) to radially extrude the reinforcing preset position of the steel bars in the direction perpendicular to the axis of the steel bars. The driving mechanism (4) comprises a hydraulic cylinder, a servo electric cylinder or a pneumatic cylinder.

2. The reinforcement device of claim 1, wherein The reinforcing execution unit (3) comprises two groups of extrusion dies (31) oppositely arranged in upper and lower positions, and arc-shaped grooves (32) are formed on the opposite surfaces of the two extrusion dies (31), wherein one of the arc-shaped grooves (32) is moved to be buckled with the other arc-shaped groove (32) to form an extrusion space.

3. The reinforcement device of claim 1, wherein The frame (2) is provided with mounting slot holes (5), one end of the driving mechanism (4) is fixedly connected with the mounting slot holes (5), one of the extrusion dies (31) is connected with the driving part of the driving mechanism (4) through a fixing block (33) and moves in the direction perpendicular to the axis of the steel bars under the driving of the driving mechanism (4), and the other extrusion die (31) is fixedly connected with the other end of the mounting slot holes (5).

4. The reinforcement device of claim 3, wherein The extrusion die (31) is externally connected with a die seat (34), and the die seat (34) connected with the fixing block (33) is slidingly connected between the mounting slot holes (5).

5. The reinforcement device of claim 4, wherein The reinforcing device for steel bars further comprises a support adjusting mechanism (6) fixedly connected with the frame (2), the support adjusting mechanism (6) comprises, 6. The reinforcement device of claim 4, wherein two support seats (61) which are both in L-shaped and are arranged on the two sides of the mounting slot holes (5) and are located on the side of the frame (2) close to the opening of the housing (1), the support seat (61) is provided with a strip-shaped hole (62), and a screw is connected with the frame (2) through the strip-shaped hole (62); a support shaft (63) connected between the two support seats (61); and support rollers (64) which are rotatably connected with the support shaft (63) through bearings (65). The support rollers (64) are composed of a rotating shaft (641) and two support blocks (642) which are integrally formed and coaxially arranged, the two support blocks (642) are both in the shape of a hollow circular truncated cone and are oppositely arranged on the left and right sides of the rotating shaft (641), the end surface with a smaller radius of the support block (642) is connected with the rotating shaft (641), and the outer side surfaces of the two support blocks (642) and the rotating shaft (641) jointly form a support groove (643).

7. The reinforcement device of claim 6, wherein The reinforcing device for steel bars further comprises a blocking mechanism (7) located on the side of the frame (2) away from the support adjusting mechanism (6), the blocking mechanism (7) comprises a baffle seat (71) and a baffle (72), the two ends of the baffle seat (71) are respectively connected with the two sides of the mounting slot holes (5), the baffle seat (71) is provided with an adjusting hole (73), the baffle (72) is in the shape of a disc, one end surface is connected in the adjusting hole (73) through a connecting shaft (74), and the other end surface is oppositely arranged with the extrusion space.

8. The reinforcement device of claim 6, wherein The bottom of the housing (1) is connected with a plurality of universal casters (8).

9. The reinforcement device of claim 1, wherein ​ 10. The reinforcement device of claim 1, wherein At least two universal lifting rings (9) are arranged on the opening side of the housing (1) and on the end face opposite the opening side.

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