Clamp device for self-biting reinforcement

Abstract

The application discloses a clamp device for self-biting steel bars, which comprises a transmission device, a rotating mechanism driven by the transmission device, and a spliced shell with a sliding groove in the inner side wall; the transmission device is located in the interior of the shell; the head of the shell is a circular ring body with a recess for accommodating the rotating mechanism; the rotating mechanism is a ring structure spliced by multiple rotating bodies, the bottom of the rotating body is provided with a bottom disc type tooth, and the end of the transmission device is provided with a rotating tooth engaged with the bottom disc type tooth; a ring groove is formed in the rotating body, the ring groove is provided with a clamping tooth, a spring clamp and a biting switch; the spring clamp comprises a spring body, an upper spring arm with an outward bending protrusion, and a lower spring arm with an inward bending protrusion; a ring groove is formed in the rotating mechanism, the ring groove is provided with a hole for clamping the inward bending protrusion, and the back side of the clamping tooth is provided with a hole for clamping the outward bending protrusion; the clamp device of the application controls the rotation of the clamping tooth through the switch, and is self-adaptive to the steel bar sleeves with different diameters, so that one specification of the clamping tooth can be matched with multiple sizes of the steel bar sleeves.

Description

Technical Field

[0001] This invention relates to a clamping device for connecting reinforcing bars with an electric wrench, and more particularly to a clamping device for self-locking reinforcing bars. Background Technology

[0002] In recent years, with the increasing maturity of rebar mechanical connection technology, rebar sleeves are commonly used for mechanical connections and have been widely adopted in many practical projects. Currently, there are relatively mature electric wrenches for tightening rebar sleeves. However, due to the complex and diverse specifications and outer diameters of rebar sleeves being tightened on construction sites, especially for rebar cage connections, traditional wrench clamps can only correspond to one type of rebar sleeve size per set of clamping teeth. When tightening rebar of various sizes, it is often necessary to frequently change the clamping teeth components, making the operation cumbersome, time-consuming, and reducing work efficiency.

[0003] In addition, because traditional clamp components and rebar sleeves have a one-to-one correspondence in size, the size of the clamping teeth must be precise, which leads to high requirements and difficulty in component processing. Furthermore, the limited mobility of these fixing components also places high demands on the processing of the rebar sleeves. However, in actual engineering, deviations in the dimensions of the rebar sleeves are inevitable. If the rebar sleeve is too small, the clamping teeth of the clamp will not be able to tightly engage with the rebar sleeve to be tightened, resulting in the clamp spinning freely or slipping during tightening. If the rebar sleeve is too large, the rotating mechanism in the clamp will not be able to fully close, the clamp will not lock, the electric wrench will not work, and safety issues will arise.

[0004] Secondly, traditional clamps cannot effectively grip the rebar sleeve, affecting the detection of the tightening torque of the electric wrench and thus impacting the quality of the rebar connection. Because the clamp teeth cannot properly engage with the rebar sleeve, leaving gaps, misalignment inevitably occurs during tightening. In this case, some of the torque generated by the electric wrench is consumed by the clamp and not applied to the rebar sleeve. However, the electric wrench's detection device stops tightening based on the torque value returned by the clamp, indicating that the set torque value has been reached. In reality, the rebar sleeve connection has not reached the specified torque, and the quality of the rebar connection cannot be guaranteed. These problems not only increase unnecessary workload and reduce work efficiency but also affect the quality of the rebar connection, compromising installation quality. Therefore, there is an urgent need for a wrench clamp that can effectively grip and engage the rebar sleeve to solve these problems. Summary of the Invention

[0005] Objective of the Invention: To address the shortcomings of existing technologies, this invention provides a self-locking rebar clamping device. Each set of locking teeth is controlled by a locking switch to rotate into the annular groove of a rotating mechanism. Pulling the locking switch ring to the end of the arc-shaped flare of the rotating mechanism compresses the spring clamp to its maximum extent. Sliding the locking switch ring to the side, the ring enters the bend and locks the locking switch. After the rebar sleeve is placed in the clamping device, pushing the locking switch ring out of the bend causes the locking teeth to adaptively lock and clamp the rebar sleeve under the spring force, improving the tightening quality of the rebar and solving the technical problem that the clamp cannot fully close due to dimensional deviations of the traditional locking teeth. At the same time, it enables a set of locking teeth to match the tightening of rebars of multiple sizes, avoiding frequent replacement of locking teeth.

[0006] Technical solution: The clamping device for self-interlocking rebar of the present invention includes a transmission device, a rotating mechanism driven by the transmission device, and a spliced ​​outer shell with a groove on the inner side wall; the transmission device is located inside the outer shell; the head of the outer shell is a ring with a groove for accommodating the rotating mechanism.

[0007] The rotating mechanism is a ring structure composed of multiple rotating bodies. The bottom of the rotating body has a base-like tooth, and the end of the transmission device has rotating teeth that mesh with the base-like tooth.

[0008] The rotating body has an annular groove, and the annular groove contains a locking tooth, a spring clip, and a biting switch; the outer side of the rotating body has a protrusion that engages with a sliding groove; the back side of the locking tooth has a locking groove; the root of the locking tooth is located in the annular groove and is rotatably connected to the top of the rotating body; the head of the locking tooth has an arc-shaped toothed band that engages with the steel bar sleeve.

[0009] The spring clip includes a spring body, an upper spring arm with an outward bending protrusion, and a lower spring arm with an inward bending protrusion. The rotating mechanism has an annular groove with a hole for engaging the inward bending protrusion, and the back side of the clip tooth has a hole for engaging the outward bending protrusion.

[0010] The engagement switch includes a pull ring and a pull rod, one end of which is inserted into a slot and fixed in the teeth;

[0011] The top of the rotating body has an arc-shaped flare with a bend; the pull ring moves from the arc-shaped flare to the bend.

[0012] The housing includes a long arc-shaped housing, a short arc-shaped housing, a pin bearing, and a pin lock. One end of the long arc-shaped housing is connected to the short arc-shaped housing via the pin bearing, and the other end of the long arc-shaped housing is connected to the short arc-shaped housing via the pin lock.

[0013] The pin lock includes an upper pin ring and a lower pin ring, and a pin is inserted into the upper pin ring and the lower pin ring.

[0014] The outer shell includes an internally hollow reaction arm, one end of which is a ring-shaped body that houses the rotating mechanism.

[0015] The actuator includes a rod diameter and an end, with the rod diameter sliding within the reaction arm.

[0016] The pull rod is an arc shape that follows the trajectory of the flared opening, and the shape of the pull rod is consistent with the trajectory of the flared opening.

[0017] The spring clip is installed at the bottom end of the annular groove.

[0018] The junction of the long arc-shaped outer shell and the reaction arm is provided with a bottom groove to accommodate the rotating teeth of the transmission.

[0019] The end of the transmission is connected to the driver, which transmits power to drive the rotating mechanism to rotate.

[0020] An anti-rotation auxiliary unit is provided on the side of the reaction arm.

[0021] Working Principle: The rotating mechanism of this invention is a ring-shaped body composed of multiple rotating bodies. Each rotating body has an arc-shaped flare at its top, and a set of engagement switches are installed inside the arc-shaped flare. One end of the engagement switch is connected to the arc-shaped flare of the rotating body, and the other end is connected to the back of the clamping teeth. The engagement switch controls the rotation of the clamping teeth. Before tightening the rebar, pull the engagement switch to the bend, so that the clamping teeth are in the retracted state, and the inside of the clamping device is in the open state. Then, insert the rebar sleeve to be tightened and lock the clamp. Then, turn the switch, and use the spring force to push the clamping teeth to adaptively engage and tighten the rebar sleeve. Finally, connect the electric wrench for tightening. Traditional clamping devices require changing the corresponding specification of clamping tooth assembly when tightening rebar sleeves with different outer diameters. However, the clamping device of this invention controls the rotation of the clamping teeth through the engagement switch, adaptively engaging rebar sleeves of different diameters, realizing that one specification of clamping teeth matches multiple sizes of rebar sleeves.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0023] (1) The clamping device of the present invention avoids the problem that the clamp cannot be fully closed due to the deviation of the specifications and dimensions of the steel bar sleeve, and solves the problem that the traditional clamping teeth cannot bite the steel bar sleeve tightly, which affects the quality of the steel bar connection.

[0024] (2) The clamping device of the present invention controls the opening and closing of the clamping teeth by the biting switch, thereby adaptively clamping and biting various specifications, different models or diameters of steel bar sleeves. It not only accurately controls the closed state of the clamp and ensures the normal operation of the clamp, but also improves the connection quality of the steel bar sleeves, and eliminates the need for frequent replacement of the clamping teeth.

[0025] (3) The clamping device of the present invention also saves installation time, makes operation easier, and improves work efficiency.

[0026] (4) Compared with the conventional toothed type, the toothed band of the present invention is narrower and longer and has an arc-shaped curved blade shape, which is intended to better adapt to steel sleeves of various sizes. Since the engagement point will correspond to different positions of the toothed band when steel sleeves of different sizes are clamped, the toothed band at the head of the tooth is designed to be arc-shaped and extended, so as to ensure that the steel sleeve is clamped while also meeting the requirements for tightening steel sleeves of various sizes.

[0027] (5) Each set of spring clips is installed in the U-shaped groove of the rotating mechanism. The upper and lower ends of the spring clips are provided with bent protrusions, which are fixed in the holes on the back side of the clamping teeth and the inner wall of the rotating mechanism, respectively, to push and pull the rotation of the clamping teeth. When the clamping device is working, the clamping teeth provide counter-support force through the elastic force of the spring clips, so that the clamping teeth tightly bite and clamp the steel bar sleeve. Therefore, the elastic force performance of the spring clips is greater than that of conventional spring clips. In addition, the connection position between the spring clips and the clamping teeth is located on the back side of the clamping tooth head. The spring arms at the upper and lower ends of the spring body are appropriately extended to increase the lever arm, compressing the spring to the maximum extent, so that the clamping teeth obtain the maximum biting force. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the components of the self-locking steel bar clamping device of the present invention in the open state;

[0029] Figure 2 This is a schematic diagram of the working state of the clamping device of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the outer shell in the clamping device of the present invention;

[0031] Figure 4 This is a schematic diagram of the transmission mechanism in the clamping device of the present invention;

[0032] Figure 5 This is a cross-sectional view of the clamping device of the present invention along the center line;

[0033] Figure 6 This is a schematic diagram of the rotating body in the clamping device of the present invention;

[0034] Figure 7 This is a schematic diagram of the clamping teeth in the clamping device of the present invention;

[0035] Figure 8 This is a schematic diagram of the spring clip in the clamping device of the present invention;

[0036] Figure 9 This is a schematic diagram of the engagement switch in the clamping device of the present invention;

[0037] Figure 10This is a schematic diagram of the clamping device of the present invention after it is engaged. Detailed Implementation

[0038] like Figure 1 As shown, the self-clamping rebar clamping device of the present invention includes a transmission device 2, a rotating mechanism 3 driven by the transmission device 2, and a spliced ​​outer shell 1 with a sliding groove 14 on its inner side wall; the transmission device 2 is located inside the outer shell 1; a groove for accommodating the rotating mechanism 3 is provided on the inner side of the outer shell 1. The rotating mechanism 3 is used to clamp the rebar sleeve.

[0039] The rotating mechanism 3 is a ring structure composed of multiple rotating bodies. The bottom of the rotating body has a base-like tooth 314, and the end of the transmission device 2 has rotating teeth that mesh with the base-like tooth 314.

[0040] In this embodiment, the rotating mechanism 3 consists of three sets of identical rotating bodies: rotating body 31, rotating body 32, and rotating body 33. The end of the transmission device 2 is provided with rotating teeth. Rotating bodies 31, 32, and 33 are connected end-to-end to form a ring-shaped rotating body, i.e., the rotating mechanism 3. Each rotating body has a base-like tooth at its bottom, and the bottom of the rotating mechanism 3 meshes with the transmission device 2 through these rotating teeth.

[0041] Each rotating body is equipped with a set of locking teeth 34, a set of spring clips 35, and a set of switches 36. Specifically, the rotating body has an annular groove 313, within which the locking teeth 34, spring clips 35, and engagement switches 36 are provided; the outer side of the rotating body has a protrusion 312 that engages with the sliding groove 14; the back side of the locking teeth 34 has a locking groove 344; the root of the locking teeth 34 is located within the annular groove 313 and is rotatably connected to the top of the rotating body; the head of the locking teeth 34 has an arc-shaped toothed band 314 that engages with the steel bar sleeve.

[0042] Each rotating body has a hole 343 on the inner circumference of the annular groove 313 for accommodating the spring clip 35. Each set of locking teeth 34 has a pin hole at its root, which allows for rotatable connection within the annular groove 313 of the rotating mechanism 3 via a pin, and can also be disassembled.

[0043] Each set of spring clips 35 is set in the annular groove 313 of the rotating body. The purpose is to enhance the rotation of the clamping teeth 34, which is beneficial for the clamping teeth 34 to clamp the steel bar sleeve.

[0044] Each set of switches 36 is located in the flared opening 315 at the top of the annular groove 313 of the rotating body, and controls the rotation of the locking teeth 34 along the trajectory of the flared opening.

[0045] The spring clip 35 includes a spring body 351, an upper spring arm, and a lower spring arm. An annular groove 313 is formed within the rotating mechanism 3, and a hole 343 is provided within the annular groove 313 for engaging the end of the lower spring arm. A hole 343 is also provided on the back side of the locking tooth 34 for engaging the end of the upper spring arm. Pin holes are provided on both sides of the inner wall of the annular groove of the rotating mechanism and at the tail of the locking tooth, allowing for connection and disassembly via pins.

[0046] The engagement switch 36 includes a pull ring 361 and a pull rod 362. One end of the pull rod 362 is engaged in the slot 344 and fixed in the tooth 34. The top of the rotating body has an arc-shaped flared opening 315 with a bend 316; the pull ring 361 moves from the arc-shaped flared opening 315 to the bend 316. Each set of switches 36 is set in the arc-shaped flared opening 315 at the top of the annular groove 313 of the rotating body, and controls the rotation of the tooth 34 along the trajectory of the arc-shaped flared opening.

[0047] One end of the pull rod 362 is located in the annular groove of the rotating mechanism, passes through the arc-shaped flare 315 and is rotatably connected to the pull ring 362. The other end of the pull rod is inserted into the slot 344 on the inner side wall of the locking tooth 34, connecting and pulling the locking tooth to move.

[0048] The head of the outer casing 1 is an annular structure with an arc-shaped U-shaped groove. The middle of the outer casing 1 is a cylindrical shell, and the end of the outer casing 1 is set as a regular hexagonal head. The interior of the outer casing 1 is hollow. The regular hexagonal head at the end of the outer casing 1 is inserted into the output port of the electric wrench, and the transmission device 2 is placed axially inside it; the transmission device 2 is connected to the rotating mechanism 3.

[0049] like Figures 2-3 As shown, the output end 17 of the outer casing 1 is a regular hexagonal head, which matches the output port of the electric wrench and is locked in place. The locking of the regular hexagonal head of the outer casing 1 secures the overall clamping device of the invention, preventing it from rotating with the electric wrench and avoiding the risk of clamping device shifting or shaking. The reaction arm 16 in the middle of the outer casing 1 is cylindrical in shape, hollow inside, and its inner wall slides in contact with the transmission rod diameter 22. When the wrench rotates, the clamping device will rotate under the influence of torque; the reaction arm 16, relying on the side steel bars, provides counter-support force to prevent the clamp from rotating. The hexagonal end of the transmission 2 is matched and connected to the output port of the electric wrench to prevent the clamp from tilting or shaking during rotation.

[0050] The ring-shaped structure at the head of the outer shell 1 is composed of a long arc-shaped outer shell 11 and a short arc-shaped outer shell 12. The first end of the long arc-shaped outer shell 11 is rotatably connected to the first end of the short arc-shaped outer shell 12, and the last end of the long arc-shaped outer shell 11 is locked to the last end of the short arc-shaped outer shell 12 by a pin.

[0051] The long arc-shaped outer shell 11 has an upper pin hole 41 on its outer circumferential wall at one end, and the short arc-shaped outer shell 12 has a lower pin hole 42 on its outer circumferential wall at one end. After the clamp is closed, it is locked in place by a pin 43. The internal cross-section of both the long arc-shaped outer shell 11 and the short arc-shaped outer shell 12 is a U-shaped groove 13, used to install the rotating mechanism 3. The long annular outer shell 11 and the short annular outer shell 12 are rotatably connected at one end by a pin bearing 5, and disassembled at the other end by a pin lock 4, thereby controlling the opening and closing of the clamp.

[0052] The pin bearing 5 passes through the pin hole on the outer circumference of the housing 1, connecting the two housings. The pin bearing 5 is an original mounting component of the fixture and does not need to be disassembled for installation during operation.

[0053] The pin lock 4 includes an upper pin hole 41, a lower pin hole 42, and a pin 43. A U-shaped groove 13 is formed inside the head of the clamping device housing 1, and annular sliding grooves 14 matching the protrusions 312 on the rotating body are provided on the inner walls of both sides of the U-shaped groove 13. A bottom groove 15 for accommodating the rotating teeth of the transmission device 2 is provided at the junction of the long arc-shaped housing 11 and the reaction arm 16.

[0054] like Figures 4 to 6 As shown, the transmission device 2 is axially positioned inside the reaction arm 16 of the housing 1 and rotates freely. The bottom of the rotating body has a base-like tooth, and the end of the transmission device 2 has rotating teeth that mesh with the base-like teeth. In this embodiment, the rotating teeth are cone-shaped teeth 21, which are frustum-shaped and installed in the bottom groove 15 of the housing 1. The width of the gears in the cone-shaped teeth 21 is set so that each tooth fully contacts and bears force during rotation. The cone-shaped teeth 21 match the base-like teeth 314 below the rotating body. The middle part of the transmission device 2 is a rod diameter 22, installed inside the reaction arm 16 of the housing 1 of the clamping device. The outer surface of the rod diameter 22 is coated with lubricating oil to reduce frictional resistance and facilitate the rotation of the transmission device 2. The hexagonal end 23 at the end of the transmission device 2 is connected to the output port of an electric wrench. The output port has a driver that matches the hexagonal end 23, driving the transmission device to rotate.

[0055] The hexagonal end of the transmission device 2 is connected to the driver of the electric wrench, receiving the torque generated by the driver, which in turn drives the transmission device 2 to rotate. Preferably, the hexagonal end of the transmission device 2 is also connected to the detector of the electric wrench, transmitting the torque value of the transmission device 2 during rotation to the detection device. The rotating teeth at the end of the transmission device 2 mesh with the base teeth of the rotating body, so that when the transmission device 2 rotates, it transmits torque to the rotating mechanism 3, driving the rotating mechanism to rotate.

[0056] like Figure 1 , Figure 2 and Figure 10As shown, rotating bodies 31 (number one), 32 (number two), and 33 (number three) are joined end-to-end to form a ring-shaped rotating body. Each rotating body is designed with a 120° arc shape, and all three have identical structures. Figure 6 As shown, two protrusions 312 are provided below the circumferential sidewall of the first rotating body 31. The protrusions 312 surround the entire rotating mechanism and are... Figure 3 The sliding grooves 14 on both sides of the outer shell 1 are matched to mount the rotating mechanism 3. An annular groove 313 is provided inside the first rotating body 31. The inner side of the annular groove 313 is open in a "C" shape, and its interior is used to house the locking teeth 34, spring clips 35, and engagement switches 36. An arc-shaped flared opening 315 is provided at the top of the first rotating body 31, connecting to the interior of the annular groove 313. The trajectory of the arc-shaped flared opening is consistent with the rotation trajectory of the locking teeth 34, and the end of the arc-shaped flared opening has a bend 316. A fastening bolt 311 is provided at the end of the first rotating body 31, through which the locking teeth 34 are rotatably connected.

[0057] like Figure 7 As shown, the locking tooth 34 is divided into a head and a root. The top surface of the root of the locking tooth 34 is provided with a bolt hole 342. The inner diameter of the bolt hole 342 is the same as that of the pin hole of the rotating mechanism. The locking tooth passes through... Figure 6 The fastening bolts 311 are rotatably connected to the rotating body. Each set of teeth 34 has a pin hole at its root, which is rotatably connected to the annular groove of the rotating mechanism 3 by the pin.

[0058] The head of the locking tooth 34 is provided with a curved, arc-shaped toothed band 341. The increased thickness of the arc-shaped toothed band 341 increases the contact area between the locking tooth and the rebar sleeve, thereby increasing the biting force of the locking tooth 34. The head of the locking tooth 34 is provided with a second bolt hole 345. A hole 343 and a slot 344 are formed on the back side of the locking tooth 34. The slot 344 communicates with the second bolt hole 345; the hole 343 is located below the slot 344 and... Figure 6 Holes 343 are also made at symmetrical positions on the inner wall of the annular groove 313 of the rotating mechanism.

[0059] like Figure 8 As shown, the spring clip 35 is mounted on the locking teeth 34 and Figure 6 Between the annular grooves 313 of the rotating mechanism, spring arms 352 extend from the upper and lower ends of the spring body 351. The upper spring arm is attached to the inner side of the retaining tooth 34, and the lower spring arm is built into the... Figure 6 On the inner wall of the annular groove 313 of the rotating mechanism 3. The ends of the upper and lower spring arms 352 of the spring clip 35 are provided with two curved protrusions 353 in opposite directions; the upper curved protrusion inserts into... Figure 7 The lower end of the bent protrusion is inserted into the hole 343 on the back side of the clasp 34. Figure 6The rotating mechanism is located within the hole 343 in the inner wall of the annular groove 313. The spring clip 35 achieves its tension and compression functions through the bending protrusions 353 at both ends.

[0060] like Figure 9 As shown, the engagement switch 36 consists of three parts, with the pull ring 361 disposed at... Figure 6 Within the arc-shaped flare 315 at the top of the rotating mechanism, the pull ring can slide freely along the trajectory of the flare, controlling the rotation of the retaining tooth 34. When the pull ring 361 moves to the end of the arc-shaped flare 315, it can rotate... Figure 6 The switch 36 is then locked within the bend 316. The pull rod 362 connects the pull ring 361 and the locking tooth 34. The pull rod 362 has a flat, elongated arc shape, consistent with the direction of the flared opening. The other end of the pull rod 362 is inserted into... Figure 7 The tooth 34 is connected to and pulled to move within the slot 344 on the back side of the tooth 34. Figure 7 The slot 344 is connected to the second bolt hole 345, and the pull rod 362 is fixedly connected to the tooth 34 by the fastening screw 363.

[0061] The installation method of the self-locking rebar clamping device of the present invention includes the following steps:

[0062] (1) First, determine the specifications and dimensions of the steel bar sleeve to be tightened. The clamping device of the present invention has a set of 34 teeth that can be matched with steel bar sleeves of various specifications and dimensions.

[0063] (2) Figure 3 As shown, remove the pin 43 from the housing 1 of the clamping device and open the pin lock 4. The short arc-shaped housing 12 of the clamp is connected and rotated by the pin bearing 5.

[0064] (3) Figure 6 , Figure 7 and Figure 8 As shown, select a set of spring clips 35, insert the inward bending protrusion of the lower spring arm of the spring clip 35 into the inner hole 343 of the annular groove 313 of the rotating mechanism 3, insert the outward bending protrusion of the upper spring arm into the back hole 343 of the retaining tooth 34, and the spring arm 352 is close to the back of the retaining tooth 34.

[0065] (4) The locking tooth 34 rotates around the outward bending protrusion of the upper spring arm until the locking tooth and the annular groove 313 of the rotating mechanism are on the same plane.

[0066] (5) Figure 6 , Figure 7 As shown, the root of the locking tooth 34 is pushed into the annular groove 313 of the rotating mechanism, and the first bolt hole 342 of the root of the locking tooth 34 is aligned with the bolt hole on the outside of the rotating mechanism. The locking tooth 34 is then connected by the fastening bolt 311.

[0067] (6) Since the rotating mechanism 3 of the fixture is composed of three identical rotating bodies spliced ​​together, each rotating body corresponds to a tooth 34, a set of spring clips 35 and a biting switch 36. The installation process of the other two teeth 34 is the same as that of the first rotating body.

[0068] (7) Figure 3 , Figure 5 and Figure 6 As shown, the protrusion 312 on the outer side of the rotating mechanism 3 is embedded in the U-shaped groove 13 of the housing along the arc-shaped sliding groove 14 on the inner wall of the U-shaped groove of the clamp housing 1; wherein, the long arc-shaped housing 11 is equipped with two rotating bodies, and the short arc-shaped housing 12 is equipped with one rotating body.

[0069] (8) Figure 6 , Figure 7 and Figure 9 As shown, pull the switch ring 361 to move it along the arc-shaped flare 315 at the top of the rotating body toward the inside of the clamp until the end of the switch rod 362 is inserted into the slot 344 on the back of the tooth 34. Then use the fastening screw 363 to connect the engagement switch 36 and the tooth 34.

[0070] (9) Since each set of teeth, spring clips and engagement switches is the same, the connection process between the other two engagement switches 36 and teeth 34 is the same.

[0071] (10) such as Figure 5 and Figure 9 As shown, pulling the three engagement switches 36 outwards opens the switch pull teeth 34, causing them to rotate and enter the annular groove 313 of the rotating mechanism. Then, pushing the switch pull ring 361 to the side causes it to engage in the bend 316 at the end of the arc-shaped flare 315.

[0072] (11) Place the steel bar sleeve to be tightened into the clamp, close the clamp, and then lock the clamp by the pin 43.

[0073] (12) Push the three engagement switches 36 out of the bend, and the locking teeth 34 adaptively engage and clamp the steel bar sleeve under the push of the spring clamp force.

[0074] (13) Insert the output port of the electric wrench into the output end 17 of the clamp housing. At this time, the hexagonal end 23 of the transmission automatically matches the rotating port inside the wrench. Rotate the housing 1 so that the housing reaction arm 16 rests on the side anti-rotation auxiliary unit. In this embodiment, the anti-rotation auxiliary unit is an auxiliary steel bar. Finally, open the electric wrench to tighten.

Claims

1. A fixture device for self-tightening reinforcement bars, characterized by: The utility model relates to a transmission (2), the rotating mechanism (3) driven by transmission (2) and the spliced shell (1) with the chute (14) of inside wall opening, transmission (2) is located the inside of shell (1), the head of shell (1) is the circular ring body with the recess of accommodating rotating mechanism (3) opening, Rotating mechanism (3) is the annular structure spliced by multiple rotors, the bottom of rotor has the bottom disc type tooth, the end of transmission (2) has the rotating tooth and engages with bottom disc type tooth, The rotor is internally provided with an annular groove (313), the annular groove (313) is provided with a clamping tooth (34), a spring clamp (35) and a snap switch (36), the outer side of the rotor has a protrusion (312) clamped into the chute (14), the back side of the clamping tooth (34) is provided with a clamping groove (344), the root of the clamping tooth (34) is located in the annular groove (313) and is rotatably connected with the top of the rotor, the head of the clamping tooth (34) has an arc-shaped tooth belt (341) clamping the reinforced sleeve, The spring clamp (35) includes a spring body (351), an upper spring arm with an outward bending protrusion, and a lower spring arm with an inward bending protrusion, the rotating mechanism (3) is internally provided with an annular groove (313), the annular groove (313) has a hole (343) clamping the inward bending protrusion, the back side of the clamping tooth (34) is provided with a hole (343) clamping the outward bending protrusion, The snap switch (36) includes a pull ring (361) and a pull rod (362), one end of the pull rod (362) is clamped into the clamping groove (344) and fixed in the clamping tooth (34); The top of the rotor is provided with an arc-shaped flared opening (315) with a corner opening (316), the pull ring (361) moves in the arc-shaped flared opening (315) to the corner opening (316); The shell includes a long arc-shaped shell (11), a short arc-shaped shell (12), a pin bolt bearing (5) and a pin bolt lock (4), one end of the long arc-shaped shell (11) is connected with the short arc-shaped shell (12) through the pin bolt bearing (5), the other end of the long arc-shaped shell (11) is connected with the short arc-shaped shell (12) through the pin bolt lock (4); The pin bolt lock (4) includes an upper pin bolt ring (41) and a lower pin bolt ring (42), the upper pin bolt ring (41) and the lower pin bolt ring (42) are inserted with a bolt (43); The shell (1) includes an internal hollow counterforce arm (16), one end of the counterforce arm (16) is a ring-shaped body accommodating the rotating mechanism; The transmission (2) includes a rod diameter (22) and an end, the rod diameter (22) slides in the counterforce arm (16); The pull rod (362) is a circular arc shape consistent with the track of the arc-shaped flared opening (315); The spring clamp (35) is installed at the bottom end of the annular groove; The long arc-shaped shell (11) and the counterforce arm (16) are provided with a bottom groove (15) accommodating the rotating tooth of the transmission at the junction; the end of the transmission (2) is connected with the driver.

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