External clamping type steel bar rotary screwing wrench

Abstract

The utility model discloses an external clamping type steel bar rotating screwing wrench which comprises a bottom cover and an upper cover buckled on the bottom cover through a bolt. A bevel gear shaft, an upper transition gear shaft and a lower transition gear shaft are sequentially and vertically arranged between the upper cover and the bottom cover from left to right through bearings. The ground cage lengthening wrench provides convenience for ground cage lengthening connection, the wrench body is made of cast aluminum materials, the whole wrench is light in weight and convenient to hold, the problem that manual threading is difficult in steel bar connection is thoroughly solved, and due to the existence of the motor, efficiency is high, and time and labor are saved in the whole using process.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, and particularly relates to an externally clamped steel bar rotating wire threading wrench. Background Art

[0002] At present, in construction, for parts such as the foundation or support columns, steel bar cages are generally used for pouring with concrete. Generally, the initial length of the support steel bars of the cage is short, and they need to be lengthened during the later pouring process. At present stage, the lengthening of the cage steel bars is generally carried out by means of binding and welding. There is also a more advanced lengthening method at present, that is, the lengthening connection of the cage steel bars is carried out through a threaded sleeve. This connection method has the following advantages: the shape of the cage after connection is good and it is easy for later binding, etc.; however, generally, the diameter and weight of the cage steel bars are large, and it is difficult to manually thread with an ordinary wrench, with low efficiency and high risk factor.

[0003] Therefore, it is very necessary to invent a handheld electric steel bar rotating wire threading wrench to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide an externally clamped steel bar rotating wire threading wrench to solve the above deficiencies in the technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An externally clamped steel bar rotating wire threading wrench includes a bottom cover and an upper cover fastened to the bottom cover by bolts; between the upper cover and the bottom cover, a bevel gear shaft and two upper and lower intermediate gear shafts are vertically arranged in sequence from left to right through bearings;

[0007] The bevel gear part of the bevel gear shaft meshes with a driving bevel gear shaft, and straight tooth parts meshing with the two intermediate gear shafts are arranged on the axial surface below the bevel gear part of the bevel gear shaft; the other end of the driving bevel gear shaft is connected to one end of a clutch through a bearing installed in the bottom cover, and the other end of the clutch is connected to the output shaft of a handheld motor;

[0008] Both the right ends of the bottom cover and the upper cover are provided with oblong openings, and an open tooth disc is arranged on the inner bottom surface of the bottom cover; the bottom surface of the open tooth disc is slidably matched with a chute opened on the inner surface of the bottom cover through an annular slide rail arranged, the open tooth disc meshes with the tooth parts of the two intermediate gear shafts respectively, and the opening part of the open tooth disc is adapted to the opening of the bottom cover;

[0009] Above the opening tooth disc, an arc-shaped connecting plate is connected by bolts, and the upper end of the arc-shaped connecting plate passes through the opening of the upper cover and extends to the upper surface of the upper cover; a connecting plate is arranged at the upper end of the arc-shaped connecting plate, and a fixed claw is arranged on the upper surface of the connecting plate through a first fixed shaft; an active claw is rotatably connected to the shaft surface of the first fixed shaft through a torsion spring; the heads of the fixed claw and the active claw are both arc-shaped bent towards each other; an opening hook is fixedly arranged on the back of the active claw close to the first fixed shaft;

[0010] On the upper surface of the upper cover located on the back side of the fixed claw, a hollow fixed block is arranged, a second fixed shaft is arranged in the fixed block, and a limit hook is rotatably connected to the second fixed shaft in the cavity of the fixed block through a torsion spring. The bending direction of the limit hook corresponds to that of the opening hook and is hooked and matched with the opening hook; a limit shaft for restricting the reverse position of the limit hook is arranged in the fixed block.

[0011] Preferably, a limit fixed shaft is arranged between the fixed claw and the connecting plate on the back of the active claw to limit the reverse position of the active claw.

[0012] Preferably, the inner arc surfaces of the fixed claw and the active claw are both tooth surfaces for increasing the friction of the steel bar bite.

[0013] Preferably, the clutch is an overrunning clutch.

[0014] In the above technical solution, the technical effects and advantages provided by the present utility model are as follows:

[0015] The present utility model provides a steel bar threading wrench that is convenient to hold, which provides convenience for the lengthened connection of the earth cage. The wrench body of the present utility model is made of cast aluminum, which is lightweight and convenient to hold as a whole, and completely solves the problem of difficult manual threading of steel bar connections. Due to the presence of the motor, the efficiency is relatively fast and time-saving and labor-saving during the whole use process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is the internal structure diagram of the present utility model;

[0018] Figure 2 is Figure 1 the bottom view (internal gear meshing diagram) of

[0019] Figure 3 is Figure 2 the top view (including the upper cover) of Detailed implementation mode

[0020] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further introduced in detail below in conjunction with the accompanying drawings.

[0021] The present utility model provides an externally clamped steel bar rotating wire threading wrench as shown in Figures 1-3 Figure 9, which includes a bottom cover 7 and an upper cover 19 fastened to the bottom cover by bolts; between the upper cover and the bottom cover, a bevel gear shaft 4 and two upper and lower intermediate gear shafts 5 are vertically arranged in sequence from left to right through bearings;

[0022] The bevel gear portion of the bevel gear shaft 4 meshes with a driving bevel gear shaft 8, and straight tooth portions 9 meshing with the two intermediate gear shafts 5 respectively are arranged on the axial surface below the bevel gear portion of the bevel gear shaft 4; the other end of the driving bevel gear shaft 8 is connected to one end of a clutch 2 through a bearing 3 installed in the bottom cover 7, and the other end of the clutch is connected to the output shaft of a hand-held motor 1;

[0023] Both the right ends of the bottom cover 7 and the upper cover 19 are provided with oblong openings, and an open tooth disc 6 is arranged on the inner bottom surface of the bottom cover 7; the bottom surface of the open tooth disc 6 is slidably matched with a chute opened on the inner surface of the bottom cover through an annular slide rail 18 arranged, the open tooth disc 6 meshes with the tooth portions of the two intermediate gear shafts 5 respectively, and the opening of the open tooth disc is adapted to the opening of the bottom cover;

[0024] An arc-shaped connecting plate 17 is connected to the upper surface of the open tooth disc 6 by bolts, and the upper end of the arc-shaped connecting plate extends through the opening of the upper cover to the upper surface of the upper cover 19; a connecting plate 16 is arranged at the upper end of the arc-shaped connecting plate, and a fixed clamping claw 15 is arranged on the upper surface of the connecting plate 16 through a first fixed shaft 14; a movable clamping claw 22 is rotatably connected to the axial surface of the first fixed shaft through a torsion spring; the heads of the fixed clamping claw 15 and the movable clamping claw 22 are both arc-shaped bent towards each other; an opening hook 12 is fixedly arranged on the back of the movable clamping claw 22 close to the first fixed shaft;

[0025] A hollow fixed block 10 is arranged on the upper surface of the upper cover located on the back side of the fixed clamping claw 15, a second fixed shaft 21 is arranged inside the fixed block, a limiting hook 11 is rotatably connected to the second fixed shaft inside the cavity of the fixed block through a torsion spring, the bending direction of the limiting hook 11 corresponds to that of the opening hook and is hooked and matched with the opening hook; a limiting shaft 20 for restricting the reverse position of the limiting hook is arranged inside the fixed block 10.

[0026] Wherein, a limiting fixed shaft 13 is arranged between the fixed clamping claw 15 and the connecting plate 16 on the back of the movable clamping claw 22 for restricting the reverse position of the movable clamping claw.

[0027] Among them, the inner arc surfaces of the fixed claw 15 and the movable claw 22 are both tooth surfaces that increase the friction of the reinforcing bar during biting; the clutch 2 is an overrunning clutch.

[0028] The working principle of this utility model is as follows:

[0029] Wrench opening: Start the motor to rotate forward. The clutch 2 drives a series of gear shafts to rotate, thereby driving the open tooth disc 6 to rotate in reverse, and then driving the arc-shaped connecting plate 17 to rotate in reverse. During this process, the fixed claw 15 rotates in reverse together with the arc-shaped connecting plate 17 and the movable claw 22. When the opening hook 12 of the movable claw 22 is hooked with the limit hook 11, the movable claw 22 will overcome the torsion of the torsion spring and open (at this time, the movable claw 22 and the limit hook 11 are respectively limited in the reverse direction by the limit fixing shaft 13 and the limit shaft 20). At this time, the clutch will make a "clicking" sound due to excessive torque. Then, turn off the forward rotation of the motor, and clamp the reinforcing bar to be threaded into the long circular opening at the front end of the wrench and place it within the inner arc surfaces of the fixed claw 15 and the movable claw 22.

[0030] Threading process: Start the motor to rotate in reverse. The clutch 2 drives a series of gear shafts to rotate, thereby driving the open tooth disc 6 to rotate forward, and then driving the arc-shaped connecting plate 17 to rotate forward. During this process, the fixed claw 15 rotates forward together with the arc-shaped connecting plate 17 and the movable claw 22. The opening hook 12 of the movable claw 22 is separated from the limit hook 11, and the movable claw 22 bites the reinforcing bar to be threaded under the torsion of the torsion spring, thereby driving the threaded reinforcing bar to continuously rotate to achieve the threading process (at this time, although the limit hook 11 touches the opening hook 12, the limit hook 11 will rotate a certain angle away from the limit shaft 20 along with the torsion of the torsion spring, so as to play a role in giving way to the opening hook 12).

[0031] Only some exemplary embodiments of the present utility model are described by way of illustration. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. An externally clamped steel bar rotary wire threading wrench, comprising a bottom cover (7) and an upper cover (19) clamped on the bottom cover by bolts; characterized in that: Between the upper cover and the bottom cover, a bevel gear shaft (4) and two upper and lower intermediate gear shafts (5) are vertically arranged in sequence from left to right through bearings; The bevel gear part of the bevel gear shaft (4) meshes with a driving bevel gear shaft (8). Straight tooth parts (9) that mesh with the two intermediate gear shafts (5) respectively are arranged on the shaft surface below the bevel gear part of the bevel gear shaft (4); The other end of the driving bevel gear shaft (8) is connected to one end of a clutch (2) through a bearing (3) installed in the bottom cover (7), and the other end of the clutch is connected to the output shaft of a handheld motor (1); Long circular hole-shaped openings are provided at the right ends of both the bottom cover (7) and the upper cover (19). An open tooth disc (6) is provided on the inner bottom surface of the bottom cover (7); The bottom surface of the open tooth disc (6) is in sliding fit with a chute opened on the inner surface of the bottom cover through an annular slide rail (18) provided. The open tooth disc (6) meshes with the tooth parts of the two intermediate gear shafts (5) respectively, and the opening part of the open tooth disc is adapted to the opening of the bottom cover; An arc-shaped connecting plate (17) is connected to the upper surface of the open tooth disc (6) through bolts. The upper end of the arc-shaped connecting plate passes through the opening of the upper cover and extends to the upper surface of the upper cover (19); A connecting plate (16) is provided at the upper end of the arc-shaped connecting plate. A fixed claw (15) is provided on the upper surface of the connecting plate (16) through a first fixed shaft (14); A movable claw (22) is rotatably connected to the shaft surface of the first fixed shaft through a torsion spring; The heads of the fixed claw (15) and the movable claw (22) are both arc-shaped bent towards each other; An opening hook (12) is fixedly provided on the back of the movable claw (22) close to the first fixed shaft; A hollow fixed block (10) is provided on the upper surface of the upper cover on the back side of the fixed claw (15). A second fixed shaft (21) is provided inside the fixed block. A limit hook (11) is rotatably connected to the second fixed shaft in the cavity of the fixed block through a torsion spring. The bending direction of the limit hook (11) corresponds to that of the opening hook and is in hook engagement with the opening hook; A limit shaft (20) for restricting the reverse position of the limit hook is provided in the fixed block (10).

2. The external card type steel bar rotary wire threading wrench according to claim 1, characterized in that: A limit fixed shaft (13) is provided between the fixed claw (15) and the connecting plate (16) on the back of the movable claw (22) for restricting the reverse position of the movable claw.

3. The external card type steel bar rotating wire threading wrench according to claim 1, characterized in that: The inner arc surfaces of the fixed claw (15) and the movable claw (22) are both tooth surfaces for increasing the friction of the reinforcing bars during biting.

4. The external card-type steel bar rotary wire threading wrench according to claim 1, characterized in that: The clutch (2) is an overrunning clutch.

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