Locking pliers for reinforcing steel bar extrusion connection joint in narrow and small space

Abstract

The utility model discloses a pair of locking pliers for a reinforcing steel bar extrusion connecting joint in a narrow space, which comprises two force arm connecting seats, two force arms are symmetrically arranged between the two force arm connecting seats, one ends of the two force arms are connected with a bidirectional telescopic hydraulic cylinder, and the other ends of the two force arms are provided with a pressing module. The pressing module comprises two half cylinders, the two half cylinders are arranged on the opposite sides of the two force arms respectively, and protruding arc-shaped teeth are arranged on the inner walls of the half cylinders. Through the lever principle, extrusion force is large, extrusion passes are few, a jaw is small, and convenience and flexibility are achieved; the device is suitable for steel bar connection operation in space-limited environments such as narrow gaps in construction sites and difficult-to-touch areas such as the bottoms of bridges, manual operation difficulty is reduced, construction safety is improved, rapid clamping and releasing are achieved through two-way stretching and retracting of the hydraulic cylinders, construction efficiency is improved, and construction safety is improved. Due to the design of the pressing module, it is ensured that the rebar joints are evenly and effectively extruded, and the connection strength is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of building industry steel bar mechanical connection, especially relates to a vise for steel bar extrusion connection joint in narrow space. BACKGROUND

[0002] Steel bar mechanical connection mainly has: sleeve extrusion connection, straight thread sleeve connection, taper thread sleeve connection, wherein sleeve extrusion connection is mainly through extruding machine and extrudes deformation to steel sleeve, makes sleeve and steel bar tightly combine, thereby realizes the connection of steel bar. Connection is reliable, quality is stable, and the adaptability to steel bar is strong. But the equipment investment is bigger, and the operation is relatively complex. It is applicable to the connection of various diameter steel bars, especially the connection of large diameter steel bars. For the constantly updated building market, the partization and modularization are applied to the building industry. For the sleeve extrusion connection, the extrusion equipment becomes the stumbling block in the industry, the extrusion force is not enough, the extrusion pass is more, the exposed short concrete component connecting steel bar, the extrusion equipment of double row and multiple row steel bars is difficult to enter and exit, which seriously affects the construction efficiency and the connection quality. SUMMARY

[0003] The utility model discloses a vise for steel bar extrusion connection joint in narrow space, which is designed to solve the technical problems in the above background. The vise has a large extrusion force, fewer extrusion passes, a small jaw, and is flexible and convenient to use.

[0004] To achieve the above object, the utility model adopts the following technical scheme: a vise for steel bar extrusion connection joint in narrow space, comprising two force arm connecting seats, two force arms symmetrically arranged between the two force arm connecting seats, a bidirectional telescopic hydraulic cylinder connected to one end of the two force arms, and a pressing module provided at the other end of the two force arms. The pressing module includes two half cylinders, each half cylinder is arranged on the opposite side of the two force arms, and the inner wall of the half cylinder is provided with a protruding arc-shaped tooth.

[0005] The vise has a large extrusion force, fewer extrusion passes, a small jaw, and is flexible and convenient to use. It is particularly suitable for steel bar connection operations in limited space environments, such as narrow gaps in construction sites, subway tunnels, and bridge bottoms. It reduces the difficulty of manual operation, improves construction safety, and realizes quick clamping and release through the bidirectional telescopic hydraulic cylinder. It improves construction efficiency, and realizes uniform and effective extrusion of the steel bar joint through the design of the two force arms and the pressing module, thereby improving the connection strength and sealing performance.

[0006] Further, the bidirectional telescopic hydraulic cylinder is provided with a fixing frame, one end of the fixing frame is in sliding connection with the two force arm connecting seats. The fixing frame provided on the bidirectional telescopic hydraulic cylinder is in sliding connection with the force arm connecting seat, thereby providing stable support for the hydraulic cylinder and enhancing the stability and load capacity of the overall structure.

[0007] Further, the force arm connecting seat comprises a connecting block, one end of the connecting block is provided with a connecting piece, the surface of the connecting block is provided with a cylinder sliding groove matched with the fixing frame, and the connecting block is in rotary connection with the force arm through a fulcrum shaft.

[0008] The design of the force arm connecting seat comprises a connecting block, a connecting piece and a cylinder sliding groove, so that the fixing frame can smoothly slide on the force arm connecting seat, and the connecting block is in rotary connection with the force arm through a fulcrum shaft, thereby ensuring the flexibility and stability of the force arm. This design makes the overall structure more compact and further improves the workability in a narrow space.

[0009] Further, a fulcrum shaft hole matched with the fulcrum shaft is formed in the middle part of the force arm, a butt joint groove is formed in one end of the force arm connected with the bidirectional telescopic hydraulic cylinder, vertex shaft holes are formed in the inner walls on both sides of the butt joint groove, and a mounting groove matched with the half cylinder is formed in the opposite side of the other end of the force arm.

[0010] The precise cooperation between the fulcrum shaft hole in the middle part of the force arm and the fulcrum shaft ensures the flexible rotation and stable support of the force arm; the design of the butt joint groove and the vertex shaft hole simplifies the connection process of the cylinder and the force arm, improves the assembly efficiency, and the design of the mounting groove facilitates the quick installation and replacement of the pressing module, thereby improving the maintainability of the equipment.

[0011] Further, the two movable ends of the bidirectional telescopic hydraulic cylinder are provided with butt joint plates, the butt joint plates are inserted into the inside of the butt joint groove, the butt joint plates are provided with butt joint holes, and the one end of the force arm connected with the bidirectional telescopic hydraulic cylinder is provided with a vertex shaft rod movably penetrating through the vertex shaft hole and the butt joint hole. Through the cooperation of the butt joint plate, the butt joint hole and the vertex shaft rod, stable connection between the bidirectional telescopic hydraulic cylinder and the force arm is realized, thereby ensuring effective force transmission.

[0012] Further, two lifting members are symmetrically arranged on the bidirectional telescopic hydraulic cylinder, the lifting member comprises a lifting ring, and a threaded connecting rod is arranged outside the lifting ring in threaded connection with the bidirectional telescopic hydraulic cylinder. The symmetrically arranged lifting members on the bidirectional telescopic hydraulic cylinder facilitate the lifting, transportation and installation of the equipment, thereby improving the construction efficiency.

[0013] Further, the outer wall of the half cylinder and or the inner wall of the assembly groove is provided with an arc-shaped magnet piece, the arc-shaped magnet piece of the outer wall of the half cylinder is flush with the outer wall of the half cylinder, and the arc-shaped magnet piece of the inner wall of the assembly groove is flush with the inner wall of the assembly groove. The arc-shaped magnet piece embedded in the outer wall of the half cylinder and or the inner wall of the assembly groove enables the compression module to be adsorbed in the assembly groove, avoids loosening or falling off in the operation process, and improves the reliability and safety of the equipment. The stable compression module reduces the downtime caused by loosening and improves the overall construction efficiency.

[0014] Compared with the prior art, the utility model has the advantages that: 1. Through the lever principle, the extrusion force is large, the extrusion pass is less, the jaw is small, and it is convenient and flexible; it is especially suitable for steel bar connection operation in difficult-to-reach areas such as narrow gaps in construction sites, subway tunnels and bridge bottoms, reduces the difficulty of manual operation, and improves construction safety; 2. Through the bidirectional extension of the hydraulic cylinder, quick clamping and releasing are realized, construction efficiency is improved, the design of the compression module ensures that the steel bar joint is uniformly and effectively extruded, and the connection strength is improved; 3. The design of the arc-shaped magnet piece enables the compression module to be adsorbed in the assembly groove, avoids loosening or falling off in the operation process, ensures the stability of the compression module under high-strength operation, improves the reliability and safety of the equipment, reduces the downtime caused by loosening, and improves the overall construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a forceps structure schematic diagram for steel bar extrusion connection joint in narrow space of the utility model;

[0016] Figure 2 It is a force arm structure schematic diagram of the utility model;

[0017] Figure 3 It is a bidirectional extension hydraulic cylinder structure schematic diagram of the utility model;

[0018] Figure 4 It is a lifting ring structure schematic diagram of the utility model;

[0019] Figure 5 It is a compression module structure schematic diagram of the utility model;

[0020] Figure 6 It is a force arm connecting seat structure schematic diagram of the utility model.

[0021] In the figure: 100, extrusion connecting sleeve; 200, reinforcing steel bar; 1, force arm connecting seat; 11, connecting block; 111, oil cylinder sliding groove; 12, connecting piece; 2, force arm; 21, fulcrum shaft hole; 22, butt joint groove; 23, vertex shaft hole; 24, assembly groove; 3, fulcrum shaft; 4, bidirectional telescopic hydraulic cylinder; 41, butt joint plate; 411, butt joint hole; 42, fixing frame; 5, vertex shaft; 6, pressing module; 61, half cylinder; 62, arc-shaped tooth; 63, arc-shaped magnet piece; 7, hoisting piece; 71, lifting ring; 72, threaded connecting rod. DETAILED DESCRIPTION

[0022] The technical scheme of the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0023] In the description of the present application, it should be noted that the terms "intermediate", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] As Figure 1 The specific scheme of the embodiment is shown in Fig. 5: a large force tongs for extrusion connecting joint of reinforcing steel bar 200 in a narrow space, comprising two force arm connecting seats 1, two force arm connecting seats 1 are symmetrically provided with two force arms 2, one end of the two force arms 2 is connected with a bidirectional telescopic hydraulic cylinder 4, the other end of the two force arms 2 is provided with a pressing module 6, the pressing module 6 comprises two half cylinders 61, the two half cylinders 61 are respectively arranged on opposite sides of the two force arms 2, the inner wall of the half cylinder 61 is provided with a protruding arc-shaped tooth 62, the arc-shaped tooth 62 is used for occluding the extrusion sleeve, and the number of teeth can be 1-4, and the width is 0.5-3 cm.

[0025] The extrusion force is large through the lever principle, the extrusion pass is less, the jaw is small, and it is convenient and flexible; it is especially suitable for steel bars 200 connection work in difficult-to-reach areas such as narrow gaps in construction sites, subway tunnels, bridge bottoms, and the like, reduces the difficulty of manual operation, improves construction safety, realizes rapid clamping and release through the bidirectional extension of the bidirectional telescopic hydraulic cylinder 4, improves construction efficiency, and through the design of the two force arms 2 and the pressing module 6, uniform and effective extrusion of the extrusion connection sleeve 100 can be realized, so that the steel bars 200 are perfectly connected to the extrusion connection sleeve 100, effectively improving the connection strength and sealing performance.

[0026] In this embodiment, the bidirectional telescopic hydraulic cylinder 4 adopts a conventional bidirectional hydraulic cylinder on the market, and is also provided with a remote control handle for remotely controlling the extension and retraction of the hydraulic cylinder.

[0027] In this embodiment, two symmetrical lifting parts 7 are arranged on the bidirectional telescopic hydraulic cylinder 4, and the lifting parts 7 are used in combination with conventional lifting devices such as electric hoists, winches, and the like.

[0028] As shown in Figure 1 , Figure 4 , the lifting part 7 includes a lifting ring 71, and a threaded connecting rod 72 is arranged outside the lifting ring 71 and is screwed with the bidirectional telescopic hydraulic cylinder 4. The symmetrical lifting parts 7 arranged on the bidirectional telescopic hydraulic cylinder 4 facilitate the lifting, transportation, and installation of the device, and improve the construction efficiency. The bidirectional telescopic hydraulic cylinder 4 is provided with a lifting hole, and the tooth angle range of the lifting hole is 50°-80°, which is matched with the threaded connecting rod 72.

[0029] As shown in Figure 1 , Figure 3 , Figure 6 , the bidirectional telescopic hydraulic cylinder 4 is provided with a fixing frame 42, and one end of the fixing frame 42 is slidably connected with the force arm connecting seat 1. The fixing frame 42 arranged on the bidirectional telescopic hydraulic cylinder 4 provides stable support for the hydraulic cylinder through the sliding connection with the force arm connecting seat 1, and enhances the stability and load-carrying capacity of the overall structure.

[0030] As shown in Figure 1 , Figure 6 , the force arm connecting seat 1 includes a connecting block 11, one end of the connecting block 11 is provided with a connecting piece 12, the surface of the connecting block 11 is provided with an oil cylinder sliding groove 111 matched with the fixing frame 42, and the connecting block 11 is rotatably connected with the force arm 2 through a fulcrum shaft 3.

[0031] In this embodiment, the design of the force arm connecting seat 1, including the connecting block 11, the connecting piece 12 and the oil cylinder sliding groove 111, enables the fixing frame 42 to smoothly slide on the force arm connecting seat 1, and the connecting block 11 is rotatably connected with the force arm 2 through the fulcrum shaft 3, which guarantees the flexibility and stability of the force arm 2. This design makes the overall structure more compact, and further improves the workability in a small space.

[0032] It should be noted that the two force arms 2 are symmetrically distributed on both sides of the connecting block 11, which ensures uniform application of the pressing force and avoids damage or loose connection of the steel bars 200 due to uneven force. Uniform force application helps to improve the connection quality and stability of the steel bar 200 joints.

[0033] As shown in Figure 2 , the middle part of the force arm 2 is provided with a fulcrum shaft hole 21 matched with the fulcrum shaft 3, and the end connected with the bidirectional telescopic hydraulic cylinder 4 is provided with a butt joint groove 22, the inner walls of both sides of the butt joint groove 22 are provided with vertex shaft holes 23, and the opposite side of the other end of the two force arms 2 is provided with a mounting groove 24 matched with the half cylinder 61.

[0034] In this embodiment, the precise fit of the fulcrum shaft hole 21 in the middle of the force arm 2 and the fulcrum shaft 3 ensures the flexible rotation and stable support of the force arm 2; the design of the butt joint groove 22 and the vertex shaft hole 23 simplifies the connection process of the oil cylinder and the force arm 2, improves the assembly efficiency, and the design of the mounting groove 24 facilitates the quick installation and replacement of the pressing module 6, improving the maintainability of the equipment.

[0035] As shown in Figure 3 , the two movable ends of the bidirectional telescopic hydraulic cylinder 4 are provided with butt joint plates 41, the butt joint plates 41 are inserted into the inside of the butt joint groove 22, the butt joint plates 41 are provided with butt joint holes 411, and the end connected with the bidirectional telescopic hydraulic cylinder 4 is provided with a vertex shaft 5 which passes through the vertex shaft hole 23 and the butt joint hole 411. Through the cooperation of the butt joint plate 41, the butt joint hole 411 and the vertex shaft 5, the stable connection between the bidirectional telescopic hydraulic cylinder 4 and the force arm 2 is realized, ensuring the effective transmission of force.

[0036] In this embodiment, the fulcrum shaft 3 and the vertex shaft 5 have the same diameter, and the fulcrum shaft 3 and the vertex shaft 5 can be thickened at one end and threaded at the other end, matched with the connecting piece 12 and the force arm 2. A nut can also be provided at the threaded end to prevent the fulcrum shaft 3 and the vertex shaft 5 from sliding out automatically. The diameters of the butt joint hole 411, the fulcrum shaft hole 21 and the vertex shaft hole 23 are slightly larger than those of the fulcrum shaft 3 or the vertex shaft 5, to ensure that the fulcrum shaft 3 or the vertex shaft 5 can rotate flexibly.

[0037] In addition, the circular arc at the inner side a of the force arm 2 has an arc degree of 50°-80°; the circular arc at the inner side a of the force arm 2 has an arc degree of 70°-100°; and the c part of the force arm 2 is in the shape of a circular arc.

[0038] As Figure 5 shown, the outer wall of the half cylinder 61 and the inner wall of the assembly groove 24 are provided with arc-shaped magnet pieces 63, and the arc-shaped magnet pieces 63 embedded in the outer wall of the half cylinder 61 and the inner wall of the assembly groove 24 enable the compression module 6 to be adsorbed in the assembly groove 24, avoiding loosening or falling off during operation, and improving the reliability and safety of the equipment. The stable compression module 6 reduces the downtime caused by loosening and improves the overall construction efficiency.

[0039] The arc-shaped magnet pieces 63 of the outer wall of the half cylinder 61 are flush with the outer wall of the half cylinder 61, and the arc-shaped magnet pieces 63 of the inner wall of the assembly groove 24 are flush with the inner wall of the assembly groove 24, avoiding ensuring that there are bumps inside the outer wall of the half cylinder 61 or the assembly groove 24, so that the assembly groove 24 and the half cylinder 61 are connected more stably.

[0040] The working principle of the above embodiment is that the fulcrum shaft 3 is used as a fulcrum, and the bidirectional telescopic hydraulic cylinder 4 is used to form a lever effect by using the bidirectional telescopic force. In use, the compression module 6 is first assembled in the assembly groove 24, so that the arc-shaped magnet pieces 63 of the outer wall of the compression module 6 are attached to the inner wall of the assembly groove 24, the lifting tool is connected to the lifting part 7, and the lifting part 7 is moved to the working surface of the extrusion connecting sleeve 100 and the steel bar 200; the force arm 2 clamps the extrusion connecting sleeve 100 with the compression module 6; the bidirectional telescopic hydraulic cylinder 4 is started, and the two abutment plates 41 are pushed outwards, and the fulcrum shaft 5 is used as a fulcrum to rotate the force arm 2; the force arm 2 rotates around the fulcrum shaft 3, so that the fixed frame 42 slides downward, and the force arm connecting seat 1 slides upward; thereby the assembly groove 24 is closed towards each other, and the compression module 6 is aligned with the extrusion connecting sleeve 100 in the assembly groove 24; when the extrusion force value and the indentation diameter meet the requirements, the loading is stopped, and then the bidirectional telescopic hydraulic cylinder 4 is retracted, the compression module 6 is released, and the next repeated extrusion operation is performed.

[0041] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A pair of heavy-duty pliers for connecting steel bars in confined spaces, characterized in that, It includes two lever arm connecting seats, and two lever arms are symmetrically arranged between the two lever arm connecting seats. One end of each lever arm is connected to a bidirectional telescopic hydraulic cylinder, and the other end of each lever arm is provided with a clamping module. The clamping module includes two half cylinders, which are respectively arranged on opposite sides of the two lever arms. The inner wall of each half cylinder is provided with protruding arc-shaped teeth.

2. The bolt cutter for connecting steel bars in confined spaces according to claim 1, characterized in that: The bidirectional telescopic hydraulic cylinder is equipped with a fixed frame, one end of which is slidably connected to the two lever arm connecting seats.

3. The bolt cutter for connecting steel bars in confined spaces according to claim 2, characterized in that: The lever arm connecting seat includes a connecting block, one end of which is provided with a connecting piece, and the surface of the connecting block is provided with a hydraulic cylinder groove adapted to the fixed frame. The connecting block is rotatably connected to the lever arm through a fulcrum shaft.

4. The bolt cutter for connecting steel bars in confined spaces according to claim 3, characterized in that: The lever arm has a fulcrum shaft hole in the middle that matches the fulcrum shaft. The end of the lever arm that connects to the bidirectional telescopic hydraulic cylinder has a docking groove. The inner walls on both sides of the docking groove have vertex shaft holes. The opposite side of the other end of the two lever arms has an assembly groove that matches the half cylinder.

5. A pair of bolt cutters for connecting steel bars in confined spaces according to claim 4, characterized in that: Both movable ends of the bidirectional telescopic hydraulic cylinder are provided with docking plates, which are inserted into the docking groove. The docking plates are provided with docking holes. The end of the lever arm connected to the bidirectional telescopic hydraulic cylinder is provided with a vertex shaft that moves through the vertex shaft hole and the docking hole.

6. The bolt cutter for connecting steel bars in confined spaces according to claim 1, characterized in that: Two lifting components are symmetrically arranged on the bidirectional telescopic hydraulic cylinder. Each lifting component includes a lifting ring, and a threaded connecting rod that is threadedly connected to the bidirectional telescopic hydraulic cylinder is provided on the outside of the lifting ring.

7. A pair of bolt cutters for connecting steel bars in confined spaces according to claim 4, characterized in that: The outer wall of the semi-cylinder and / or the inner wall of the assembly groove are provided with arc-shaped magnet pieces. The arc-shaped magnet pieces on the outer wall of the semi-cylinder are flush with the outer wall of the semi-cylinder, and the arc-shaped magnet pieces on the inner wall of the assembly groove are flush with the inner wall of the assembly groove.

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