An open ended power wrench for connecting reinforcing bars and sleeves

Abstract

The application provides an open type electric wrench for connecting steel bars and sleeves, comprising a driving source, an adjusting device, a transmission device and a clamping device, the adjusting device is connected with the driving source and can adjust the torque and / or rotating speed output by the driving source, the transmission device is connected with the adjusting device, the clamping device is arranged at the end of the transmission device and is used for matching and applying rotating force to a workpiece, a shell is arranged at the front end of the driving source, the adjusting device and the transmission device are arranged in the shell, and the automatic adjusting device is arranged, when the load is small, the rotating core assembly drives the planetary reduction assembly and the rotating drum to rotate, the planetary reduction assembly and the rotating core assembly are synchronously output, the initial screwing rotating speed is fast, when the load continuously increases to a certain threshold value, the limiting device limits the rotation of the rotating drum, the rotating core assembly only drives the planetary reduction assembly to operate, the planetary reduction assembly outputs larger torque, the final screwing rotating speed is low, and the torque is large.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and in particular to an open-end electric wrench for connecting steel bars and sockets. Background Technology

[0002] Currently, when people need to connect and tighten steel bars and pipes, they mostly use manual tools such as steel bar wrenches or pipe wrenches. This method of operation has obvious disadvantages: the initial tightening speed is slow and the efficiency is low; the final tightening torque is insufficient; the connection strength does not meet national standards; and it causes significant damage to the surface of the steel bars. The quality of the operation is also easily affected by the skill level of the operator.

[0003] Our company has been committed to the research and development and production of power tools. After developing the first generation of technology and products (patent number 2019102831017), we found the following problems during the testing and use: (1) The first generation of products uses an impact mechanism to drive the worm gear, which cannot generate a large impact force on long steel bars. Because the steel bars to be tightened are 6-12 meters long, the steel bars will absorb the impact force generated by the impact mechanism in the length direction, resulting in the final tightening torque not meeting the standard; (2) The second clamping part of its auxiliary clamping mechanism is driven by a spring, which is inconvenient to clamp and affects the ease of use; (3) The worm gear can only rotate after the main cutting shell and the secondary cutting shell are closed, which also affects the ease of use.

[0004] Some existing electric wrenches, such as the Chinese patent application number 201820470411.0 which discloses an electric wrench for connecting rebar sleeve threads, consist of a handle, a housing, and a locking device integrally connected by a housing. The handle has a power supply, a power switch, and a function knob. The housing contains a motor, a torque limiter, and a transmission gear. The locking device has a support housing, a toothed ring, and a clamping mechanism. The support housing is a U-shaped annular housing with its opening facing the axis of the support housing. It has a movable part and a fixed part. Its outer top wall is perpendicular to the side walls on both sides. The toothed ring is an outer toothed ring located inside the support housing. The toothed ring has a movable part and a fixed part. The clamping mechanism is radially evenly distributed around the inner side of the toothed ring near the axis. The movable part of the support housing can open or close together with the movable part of the toothed ring. This technical solution can only clamp the sleeve, and when clamping the sleeve, the toothed ring needs to be gently rotated according to the overlap line markings until its moving part is fully inserted into the moving part of the support housing. This method requires visual judgment to determine whether the overlap line markings are aligned, which is very difficult for the high-speed rotating toothed ring. In other words, aligning the overlap line markings without mechanical positioning is not easy. Since both ends of the sleeve need to be connected to reinforcing bars via threads, after screwing the sleeve onto one reinforcing bar, the other reinforcing bar needs to be screwed onto the sleeve. Therefore, this wrench can only complete half the work. Furthermore, this technical solution requires changing the clamping jaws for different diameter sleeves, resulting in a narrow range of application and the need to constantly change the clamping jaws for different diameter sleeves. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an open-end electric wrench for connecting reinforcing bars and sleeves, comprising: Driver source; An adjustment device, connected to the drive source, is capable of adjusting the torque and / or speed output by the drive source; The transmission device is connected to the adjustment device; A clamping device is disposed at the end of the transmission device; it is used to engage the workpiece and apply a rotational force to the workpiece. A housing is disposed at the front end of the drive source; the adjustment device and the transmission device are disposed in the housing, and the front end of the housing is provided with an opening; The transmission device includes: A drive gear is connected to the adjusting device; The intermediate gear meshes with the drive gear; and A rotor meshes with the intermediate gear; a clamping device is disposed on the rotor; the rotor drives the clamping device to rotate, the rotor includes a radial opening, and the rotor is configured to mesh with the intermediate gear during the rotational motion of the rotor.

[0006] Furthermore, there are two intermediate gears, distributed on both sides of the drive gear, and at least one of the intermediate gears meshes with the rotor during the rotor's rotational motion.

[0007] Furthermore, a bevel gear a is provided at the front end of the adjustment device, and a bevel gear b is coaxially provided at the lower part of the drive gear, with the bevel gear a and the bevel gear b meshing.

[0008] Furthermore, the housing is provided with a sliding groove, the rotor is provided with a pin a, and bearings a are provided at both ends of the pin a, and the bearings a are in rolling contact with the sliding groove.

[0009] Furthermore, a pin b is provided on the housing, a roller is mounted on the pin b, and a groove b is provided on the rotor, with the roller making rolling contact with the groove b.

[0010] Furthermore, the regulating device is a speed reduction device or an automatic torque regulating device, wherein the automatic torque regulating device can automatically increase the output torque according to the increase of load.

[0011] Furthermore, it also includes a torque limiter, which cuts off the power output from the drive source to the deceleration device or the automatic torque adjustment device when the load reaches a certain threshold.

[0012] Furthermore, the automatic torque adjustment device includes: The rotating core assembly has one end connected to the drive source, and the drive source drives the rotating core assembly to rotate. The planetary reduction assembly has its central sun gear connected to the other end of the rotating core assembly; A rotating drum, wherein the rotating core assembly and the planetary reduction assembly are disposed within the rotating drum; The rotating drum has: A slot is provided inside the rotating drum and cooperates with the rotating core assembly; Internal gears, disposed within the rotating cylinder, cooperate with the planetary reduction assembly to form a complete planetary reducer; and A limiting groove is provided outside the rotating drum; A limiting device is provided on the housing. The limiting device includes a pawl, which is biased against the outer side of the upper limit groove of the rotating drum and restricts the rotational movement of the rotating drum in a clockwise or counterclockwise direction. The core assembly has: Rotating core, with a slider retainer on the rotating core; Two movable blocks are slidably mounted within the slider holder. Spring a, installed between the two movable blocks, pushes them outward; and A roller is rotatably mounted on the outer end of the movable block, and the roller engages with the slot. When the load is relatively small, the roller is pushed into the slot of the rotating drum by spring a and the movable block, and will not come out. The rotating core assembly drives the planetary reduction assembly and the rotating drum to rotate together. The automatic torque adjustment device does not decelerate, so that the planetary reduction assembly and the rotating core assembly output synchronously. When the load continues to increase and reaches a certain threshold, the roller and the movable block can overcome the pressure of spring a and be pressed into the slider holder. The rotating core assembly and the rotating drum rotate relative to each other. The rotating drum tends to reverse. At this time, the limiting device restricts the rotating drum from rotating in the opposite direction. The rotating core assembly only drives the planetary reduction assembly to operate. The automatic torque adjustment device starts to decelerate the output and increase the torque output.

[0013] Furthermore, the planetary deceleration assembly includes: Planetary support; The planetary gear is rotatably mounted on the planet carrier and meshes with the internal teeth of the rotating drum; The sun gear is located inside the planet carrier and connected to the other end of the rotating core. The sun gear meshes with the planet gears, and the planet carrier outputs power.

[0014] Furthermore, the limiting device also includes: The base is mounted on the housing; The swing frame is rotatably mounted on the base. Spring b, one end of which is connected to the swing frame; the other end of spring b is connected to the pawl; and Two magnets are disposed on both sides of the base. The magnets can hold the swing frame in the corresponding position after the swing frame is manually switched by attraction. The swing frame drives the spring b to swing, thereby causing the spring b to drive the pawl to deflect to the left or right, and causing the pawl to engage in the limiting groove to restrict the rotation of the drum in the clockwise or counterclockwise direction.

[0015] Furthermore, the clamping device includes: Support frame a; Clamping block a is disposed on the support frame a; Clamping block b is disposed on the support frame a; and Bolt a connects clamping block a and clamping block b, and is used to adjust the distance between clamping block a and clamping block b; The inner surface of clamping block a is smooth, while the inner surface of clamping block b is provided with teeth.

[0016] Furthermore, it also includes: A slide rail device is located on the opposite side of the clamping device; An auxiliary clamping device is provided on the slide rail device.

[0017] Furthermore, the auxiliary clamping device includes: Support frame b; A rolling shaft is rotatably mounted on the support frame b, and the support frame b is rotatably connected to the slide rail device through the rolling shaft. Clamping block c is disposed on the support frame b; Clamping block d is disposed on the support frame b; and Bolt b connects clamping block c and clamping block d, and is used to adjust the distance between clamping block c and clamping block d; The inner surface of clamping block c is smooth, and the inner surface of clamping block d is provided with teeth.

[0018] Furthermore, a magnet retainer is provided at the end of the slide rail device, and a strong magnet is installed inside the magnet retainer. The strong magnet attracts the auxiliary clamping device, which can be positioned at the end of the slide rail device at the initial working position.

[0019] Furthermore, it also includes a constant torque control system, which comprises: The input section is used for setting parameters; A current detection module is used to detect the input current of the driving source; The output module is connected to the driver source; The controller, connected to the input section, current detection module, and output module, adjusts the current output by the output module based on the parameters input from the input section and the current information fed back by the current detection module. The power module is used to perform power conversion and provide stable power to the controller, current sensing module and input section.

[0020] Because the present invention adopts the above-described technical solution, the present invention has the following advantages: 1. By setting a radial opening, and when the radial opening rotates to coincide with the front opening of the housing, the device can directly mount and clamp the workpiece from the side, without having the workpiece pass through the through hole of the rotor and then be clamped, which can effectively save time and processes.

[0021] 2. By setting bolt a to adjust the distance between clamping block a and clamping block b, this invention enables the device to adapt to steel bars of different diameters, solving the problem of needing to replace different specifications of clamping claws for steel bars of different diameters, thus improving the performance of the device.

[0022] 3. This invention, by setting up an automatic torque adjustment device, when the load is relatively small, drives the planetary reduction assembly and the rotating drum to rotate through the rotating core assembly, so that the planetary reduction assembly and the rotating core assembly output synchronously, achieving the technical effect of fast initial tightening speed. Its tightening speed is 15-20 times that of manual tightening, and it can complete the tightening work of a large number of steel bars to be connected in a short time. When the load continues to increase and reaches a certain threshold, the rotating drum is restricted to rotate through the limit device, and the rotating core assembly only drives the planetary reduction assembly to operate. The planetary reduction assembly outputs a large torque, achieving the technical effect of low final tightening speed and large torque.

[0023] 4. The present invention provides inverted teeth on the inner side of clamping block b, and the inner sides of clamping block a and clamping block b form a V-shaped angle. When the reinforcing bar is rotated, the inverted teeth on the inner side of clamping block b will clamp the reinforcing bar tighter and tighter, making it difficult for the reinforcing bar to come out between clamping block a and clamping block b.

[0024] 5. By setting an auxiliary clamping device on the slide rail device, the present invention enables the clamping device of the device and the auxiliary clamping device to clamp the steel bar b and the steel bar a respectively. The clamping device drives the steel bar b3 to rotate, thereby achieving simultaneous tightening of steel bar b and steel bar a. This allows for single-person tightening, saving labor costs compared to traditional construction methods.

[0025] 6. By setting a magnetic retainer at the end of the slide rail device, the present invention allows the initial working position of the auxiliary clamping device to be located at the end of the slide rail device, thereby maximizing the distance between the clamping device and the auxiliary clamping device, which is beneficial to the better operation of the device.

[0026] 7. By setting a constant torque control system to control the input current of the drive source, a constant torque output of the drive source can be achieved. This ensures that the torque output of the drive source to the rebar after passing through the adjustment device, transmission device, and clamping device is the set torque value. By setting different parameters in the input section for rebars of different diameters, the device can output different amounts of torque to the rebar. This makes the output torque of the device controllable and adjustable, making it more convenient to use. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the clamping device structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the driving source structure of the present invention.

[0030] Figure 4 This is a schematic diagram of the automatic torque adjustment device of the present invention.

[0031] Figure 5 This is an exploded structural diagram of the automatic torque adjustment device of the present invention.

[0032] Figure 6 This is a schematic diagram of the transmission device structure of the present invention.

[0033] Figure 7 This is a schematic diagram of the planetary deceleration assembly of the present invention in an explosion.

[0034] Figure 8 This is a schematic diagram of the rotating drum structure of the present invention.

[0035] Figure 9 This is a schematic diagram of the exploded structure of the limiting device of the present invention.

[0036] Figure 10 This is a schematic diagram of the drive gear structure of the present invention.

[0037] Figure 11 This is a schematic diagram of the rotor structure of the present invention.

[0038] Figure 12 This is a schematic diagram of another rotor structure of the present invention.

[0039] Figure 13 This is a schematic diagram of another structure of the housing of the present invention.

[0040] Figure 14 This is an exploded structural diagram of the clamping device of the present invention.

[0041] Figure 15 This is a schematic diagram of the slide rail device and auxiliary clamping device of the present invention.

[0042] Figure 16 This is an exploded structural diagram of the auxiliary clamping device of the present invention.

[0043] Figure 17 This is a schematic diagram of the working state of the present invention.

[0044] Icon labels: 1-Sleeve; 2-Rebar a; 3-Rebar b; 10-Drive source; 20-Automatic torque adjustment device; 30-Transmission device; 40-Clamping device; 50-Handle; 60-Slide rail device; 70-Auxiliary clamping device; 80-Housing; 81-Cover; 11-Drive shaft; 12-Gear shaft; 121-Gear a; 122-Gear b; 21-Gear c; 22-Rotating core; 23-Bevel gear a; 24-Planetary reduction assembly; 25-Rotating drum; 26-Limiting device; 27-End cover a; 28-End cover b; 221-Slider retainer; 222-Spring a; 223-Moving block; 224-Roller; 241-Planetary carrier; 242-Planetary gear; 243-Sun gear; 251-Slot; 252-Internal gear; 253-Limiting slot; 261-Base; 262-Pawl; 263-Spring b; 264-Swing frame; 265-Magnet; 31-Drive gear; 32-Intermediate gear; 33-Rotor; 34-Bevel gear b; 331-Radial opening; 332-Pin a; 333-Bearing a; 334-Slide groove b; 41-Support frame a; 42-Clamping block a; 43-Clamping block b; 44-Bolt a; 61-Magnet retainer; 71-Support frame b; 72-Clamping block c; 73-Clamping block d; 74-Bolt b; 75-Rolling shaft; 801-Slide groove a; 802-Pin b; 803-Roller. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or it can be an element placed in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] Please see Figure 1 , Figure 2An open-end electric wrench for connecting a reinforcing bar and a sleeve, as described in one embodiment, includes: Drive source 10; specifically, the drive source 10 in this application can be any type of motor, such as electric, pneumatic, hydraulic or manual, to provide power to the device.

[0049] The front end of the drive source 10 includes a reduction gear mechanism; please refer to [link / reference]. Figure 3 , Figure 4 The reduction mechanism includes a gear shaft 12, gear a121, gear b122, and gear c21. The power output shaft of the drive source 10 is the drive shaft 11. The gear shaft 12 is rotatably mounted on the front end of the drive source 10. Gear a121 is mounted on the lower part of the gear shaft 12, and gear b122 is mounted on the upper part of the gear shaft 12. Gear c21 is mounted on the rotating core 22. Gear a121 meshes with the drive shaft 11, and gear b122 meshes with gear c21. By setting a reduction mechanism between the drive source 10 and the adjustment device, the torque output from the drive source 10 to the adjustment device can be initially increased.

[0050] An adjustment device, connected to the drive source 10, is capable of adjusting the torque and / or speed output by the drive source 10. Specifically, the adjustment device is a reduction gear or an automatic torque adjustment device 20. The automatic torque adjustment device 20 can automatically increase the output torque according to the increase of the load. In the early stage of the work, when the required torque is small, the automatic torque adjustment device 20 can provide high speed and small torque to quickly screw the workpiece in. In the later stage of the work, when a larger torque is required, the automatic torque adjustment device 20 can automatically provide low speed and large torque to tighten the workpiece. The reduction gear can be a common gear reducer, gearbox, planetary reduction assembly, or other reducer. By setting the reduction gear, a low speed and large torque can be provided to tighten the workpiece. It may also include a torque limiter, which connects the drive source 10 to the reduction gear or the torque automatic adjustment device. When the load reaches a certain threshold, the torque limiter cuts off the power output from the drive source 10 to the reduction gear or the torque automatic adjustment device.

[0051] The transmission device 30 is connected to the adjustment device; the torque output by the adjustment device is transmitted to the clamping device 40 through the transmission device 30, and the clamping device 40 clamps the workpiece and applies rotational force to the workpiece to tighten it.

[0052] The clamping device 40 is located at the end of the transmission device 30; it is used to cooperate with the workpiece and apply rotational force to the workpiece. The clamping device 40 in this device can clamp the sleeve 1 and drive the sleeve 1 to tighten, or clamp the steel bar and drive the steel bar to tighten, or clamp the pipe in daily life and drive the pipe to tighten.

[0053] The handle 50 is located on one side of the housing 80. The handle 50 makes it easier to hold the tool when using it.

[0054] A housing 80 is disposed at the front end of the drive source 10; an adjustment device and a transmission device 30 are disposed in the housing 80, and an opening is provided at the front end of the housing 80; a cover 81 is provided on the upper surface of the housing 80, and the front end of the cover 81 is provided with an opening corresponding to the housing 80.

[0055] In another embodiment of this example, see [link to relevant documentation]. Figure 9 , Figure 11 The housing 80 is provided with a sliding groove a801, and the rotor 33 is provided with a pin a332. Bearings a333 are provided at both ends of the pin a332. The bearings a333 are in rolling contact with the sliding groove a801. Specifically, the bearings a333 are needle roller bearings. The cover 81 is provided with a sliding groove corresponding to the sliding groove a801 on the housing 80. The bearings a333 are embedded in the sliding grooves of the housing 80 and the cover 81. The side of the bearings a333 is in rolling contact with the side of the sliding grooves a801 on the housing 80 and the side of the sliding grooves on the cover 81. This arrangement can reduce friction.

[0056] In another embodiment of this example, see [link to relevant documentation]. Figure 12 , Figure 13 The housing 80 is provided with a pin b802, and a roller 803 is mounted on the pin b802. The rotor 33 is provided with a groove b334, and the roller 803 is in rolling contact with the groove b334. Specifically, the roller 803 is a needle roller bearing. The cover 81 is provided with a pin and a roller 803 corresponding to the pin b802 on the housing 80. By having the pin and roller 803 on the housing 80 and the cover 81 embedded in the groove b334 on the rotor 33, friction can be reduced, which is beneficial to transmission.

[0057] In another embodiment of this example, see [link to relevant documentation]. Figure 6 , Figure 10 , Figure 14 The transmission device 30 includes: The drive gear 31 is connected to the adjustment device; the drive gear 31 is rotatably mounted in the housing 80, and the adjustment device drives the drive gear 31 to rotate. The intermediate gear 32 meshes with the drive gear 31. The intermediate gear 32 is rotatably mounted in the housing 80. There can be two or four intermediate gears, or an even number. Preferably, there are two intermediate gears 32, distributed on both sides of the drive gear 31. During the rotation of the rotor 33, at least one intermediate gear 32 meshes with the rotor 33. By setting two intermediate gears 32, the rotor 33 is driven. The rotation drive structure is simple and does not require too many intermediate gears 32, so the weight of the device is not too heavy.

[0058] The rotor 33 meshes with the intermediate gear 32; the clamping device 40 is mounted on the rotor 33; the rotor 33 drives the clamping device 40 to rotate. The rotor 33 can be a single unit, with a through hole in the middle. The workpiece passes through the through hole in the middle of the rotor 33, and the clamping device 40 clamps the workpiece and applies a rotational force to tighten it. Preferably, the rotor 33 includes a radial opening 331, and the rotor 33 is configured to mesh with the intermediate gear 32 during its rotational movement. The opening formed by the clamping blocks a42 and b43 of the clamping device 40 coincides with the radial opening 331 of the rotor 33. By providing the radial opening 331, and when the radial opening 331 rotates to coincide with the opening at the front end of the housing 80, the device can directly mount and clamp the workpiece from the side, without requiring the workpiece to pass through the through hole of the rotor 33 before clamping, effectively saving time and processes.

[0059] In another embodiment of this example, see [link to relevant documentation]. Figures 4 to 8 The torque automatic adjustment device 20 includes: The rotating core assembly is connected at one end to the drive source 10, and the drive source 10 drives the rotating core assembly to rotate. The planetary reduction assembly 24 has a central sun gear 243 connected to the other end of the rotating core assembly; the rotating core assembly drives the planetary reduction assembly 24 to rotate. Rotary drum 25, the rotating core assembly and the planetary reduction assembly 24 are disposed inside the rotary drum 25; The rotating drum 25 has: The slot 251 is disposed inside the rotating cylinder 25 and cooperates with the rotating core assembly; Internal gear 252 is disposed within the rotating cylinder 25 and cooperates with the planetary reduction assembly 24 to form a complete planetary reducer; and The limiting groove 253 is provided outside the rotating drum 25; there are two sets of limiting grooves 253 on the rotating drum 25, and the openings of the two sets of limiting grooves 253 face opposite directions. The two sets of limiting grooves 253 are configured so that the rotating drum 25 is restricted to rotate by the pawl 262 in two different directions. A limiting device 26 is provided on the housing 80. The limiting device 26 includes a pawl 262. The pawl 262 is biased against the outer side of the portion where the upper limit groove 253 of the rotating drum 25 is located, and restricts the rotational movement of the rotating drum 25 in the clockwise or counterclockwise direction. End cap a27, installed at one end of rotating drum 25; and End cap b28 is installed at the other end of the rotating drum 25.

[0060] In another embodiment of this example, see [link to relevant documentation]. Figure 5 The core assembly includes: Rotating core 22, on which a slider retainer 221 is provided; Two movable blocks 223 are slidably mounted inside the slider holder 221. Spring a222 is installed between the two movable blocks 223 and pushes them outward; and Roller 224 is rotatably mounted on the outer end of the movable block 223, and the roller (224) cooperates with the slot (251); The spring force of spring a222 pushes the movable block 223 outward in the slider retainer 221, causing the roller 224 at the front end of the movable block 223 to engage with the slot 251. When the load is relatively small, the roller 224 is locked into the slot 251 of the rotating drum 25 and will not dislodge. The rotating core assembly drives the planetary reduction assembly 24 and the rotating drum 25 to rotate together, and the automatic torque adjustment device 20 does not reduce speed, ensuring that the planetary reduction assembly 24 and the rotating core assembly output synchronously, achieving a high initial tightening speed. When the load continues to increase and reaches a certain threshold, the roller 224 and the movable block 223 can overcome... The roller 224 is pressed into the slider retainer 221 by the pressure of the spring a222. The roller 224 slips on the inner annular surface of the rotating drum 25. The rotating core assembly and the rotating drum 25 rotate relative to each other. The rotating drum 25 tends to rotate in the opposite direction. At this time, the limiting device 26 restricts the rotating drum 25 from rotating in the opposite direction. The rotating core assembly only drives the planetary reduction assembly 24 to operate. The torque automatic adjustment device 20 starts to decelerate the output and increase the torque output, achieving the technical effect of low speed and high torque in the final tightening. This perfectly solves the technical problem of "slow initial tightening speed, low efficiency, and insufficient final tightening torque", and achieves full utilization of the power characteristics of this device in each stage of tightening.

[0061] In another embodiment of this example, see [link to relevant documentation]. Figure 7 The planetary deceleration assembly 24 includes: Planetary Carrier 241; Planetary gears 242 are rotatably mounted on planet carrier 241 and mesh with the internal gears 252 of rotating cylinder 25; there are three planetary gears 242, which are evenly distributed on planet carrier 241. The sun gear 243 is located inside the planet carrier 241 and is connected to the other end of the rotating core 22. The sun gear 243 meshes with the planet gears 242. The sun gear 243 meshes with all three planet gears 242, and the planet carrier 241 outputs power. The sun gear 243 drives the three planet gears 242 to rotate. All three planet gears 242 mesh with the teeth 252 inside the rotating cylinder 25, and the planet carrier 241 outputs power.

[0062] In another embodiment of this example, see [link to relevant documentation]. Figure 4 , Figure 10The front end of the adjusting device is provided with a bevel gear a23, and the lower part of the drive gear 31 is coaxially provided with a bevel gear b34. The bevel gear a23 and the bevel gear b34 mesh. Specifically, the bevel gear a23 is fixedly installed at the front end of the planetary carrier 241, and the bevel gear b34 is fixedly installed coaxially at the lower part of the drive gear 31. The torque output by the adjusting device is transmitted to the transmission device 30 through the meshing of the bevel gear a23 and the bevel gear b34.

[0063] In another embodiment of this example, see [link to relevant documentation]. Figure 9 The limiting device 26 also includes: Base 261 is mounted on housing 80; The swing frame 264 is rotatably mounted on the base 261; Spring b263, one end is connected to swing frame 264; the other end of spring b263 is connected to pawl 262; the middle part of pawl 262 is hinged to a groove at the rear of housing 80 by a pin; and Two magnets 265 are disposed on both sides of the base 261. The magnets 265 can hold the swing frame 264 in the corresponding position after the swing frame 264 is manually switched by attraction. The swing frame 264 drives the spring b263 to swing, thereby causing the spring b263 to drive the pawl 262 to deflect to the left or right, and causing the pawl 262 to engage in the limiting groove 253 to restrict the rotation of the rotating cylinder 25 in the clockwise or counterclockwise direction.

[0064] The rotating drum 25 has two sets of limiting grooves 253, and the openings of the two sets of limiting grooves 253 face opposite directions. The two sets of limiting grooves 253 are configured so that the rotating drum 25 is restricted from rotating by pawl 262 in two different directions. The swing frame 264 drives the spring b263 to swing, thereby causing the spring b263 to drive the pawl 262 to deflect to the left or right. The two deflection states of the pawl 262 cooperate with the two sets of limiting grooves 253 on the rotating drum 25 to limit the rotation of the rotating drum 25.

[0065] Specifically, a magnet 265 is set on each side of the base 261. During the tightening of the steel bar, the swing frame 264 is manually operated to deflect to the left, so that the magnet 265 on the left attracts the swing frame 264. The pawl 262 deflects to the right under the action of the spring. At this time, the clockwise rotation of the drum 25 will not be hindered, and its counterclockwise rotation will be blocked by the pawl 262. During the loosening of the steel bar, the operation process and result are the opposite of the above process.

[0066] In another embodiment of this example, see [link to relevant documentation]. Figure 14 The clamping device 40 includes: Support frame a41; fixedly mounted on rotor 33, and driven to rotate by rotor 33; Clamping block a42 is mounted on support frame a41; Clamping block b43 is disposed on support frame a41; specifically, clamping block a42 and clamping block b43 are slidably mounted on support frame a41; Bolt A44 connects clamping blocks A42 and B43, and is used to adjust the distance between clamping blocks A42 and B43. By adjusting the distance between clamping blocks A42 and B43 through bolt A44, this device can adapt to steel bars of different diameters, solving the problem of needing to replace different specifications of clamps for steel bars of different diameters, thus improving the performance of this device.

[0067] The inner surface of clamping block a42 is smooth, and the inner surface of clamping block b43 is provided with reverse teeth. The inner surfaces of clamping block a42 and clamping block b43 form a V-shaped angle, and a self-clamping mechanism is formed between clamping block a42 and clamping block b43. When the reinforcing bar is rotated, the reverse teeth on the inner side of clamping block b43 will clamp the reinforcing bar tighter and tighter, making it difficult for the reinforcing bar to come out between clamping block a42 and clamping block b43.

[0068] This device, by setting up a clamping device 40, can clamp the reinforcing bar a2, sleeve 1, or pipe and rotate and tighten them.

[0069] In another embodiment of this example, see [link to relevant documentation]. Figure 15 It also includes: The slide rail device 60 is located on the opposite side of the clamping device 40; An auxiliary clamping device 70 is provided on the slide rail device 60. Specifically, the auxiliary clamping device 70 is slidably mounted on the slide rail device 60. In the case of rebar sleeves, by providing the auxiliary clamping device 70 on the slide rail device 60, the clamping device 40 and the auxiliary clamping device 70 of this device can clamp the rebar b3 and the rebar a2 respectively. The clamping device 40 drives the rebar b3 to rotate, thereby achieving simultaneous tightening of the rebar b3 and the rebar a2. This allows for single-person tightening, eliminating the need for two people, one to hold one end and the other to tighten the other end, as is required with ordinary rebar wrenches.

[0070] In another embodiment of this example, see [link to relevant documentation]. Figure 16 The auxiliary clamping device 70 includes: Support frame b71; A rolling shaft 75 is rotatably mounted on a support frame b71, and the support frame b71 is rotatably connected to the slide rail device 60 via the rolling shaft 75. Clamping block c72 is mounted on support frame b71; Clamping block d73 is mounted on support frame b71; and Bolt B74 connects clamping block C72 and clamping block D73, and is used to adjust the distance between clamping block C72 and clamping block D73; The inner surface of clamping block c72 is smooth, while the inner surface of clamping block d73 is toothed and has reverse teeth. The inner surfaces of clamping block c72 and clamping block d73 form a V-shaped angle, creating a self-clamping mechanism. When the reinforcing bar is rotated, the reverse teeth on the inner side of clamping block d73 clamp the reinforcing bar tighter and tighter, making it difficult for the reinforcing bar to come out between clamping block c72 and clamping block d73.

[0071] In another embodiment of this example, see [link to relevant documentation]. Figure 16 A magnet retainer 61 is provided at the end of the slide rail device 60. A strong magnet is installed inside the magnet retainer 61. The strong magnet attracts the auxiliary clamping device 70, so that the initial working position of the auxiliary clamping device 70 is located at the end of the slide rail device 60. During the tightening of the steel bar or pipe, when the auxiliary clamping device 70 of this device is used, the clamping device 40 and the auxiliary clamping device 70 can clamp the steel bar a2 and the steel bar b3 respectively. During the rotation of the steel bar b3 driven by the clamping device 40, the distance between the clamping device 40 and the auxiliary clamping device 70 will shorten. By providing a magnet retainer 61 at the end of the slide rail device 60, the initial working position of the auxiliary clamping device 70 is located at the end of the slide rail device 60, so that the distance between the clamping device 40 and the auxiliary clamping device 70 is at its maximum position, and it is not easy for the clamping device 40 and the auxiliary clamping device 70 to collide and interfere with the sleeve 1.

[0072] In another embodiment of this invention, a constant torque control system is further included, the constant torque control system comprising: The input section is used for setting parameters; A current detection module is used to detect the input current of the driving source; The output module is connected to the driver source; The controller, connected to the input section, current detection module, and output module, adjusts the current output by the output module based on the parameters input from the input section and the current information fed back by the current detection module. The power module is used to perform power conversion and provide stable power to the controller, current sensing module and input section.

[0073] By setting a constant torque control system to control the input current of the drive source 10, a constant torque output of the drive source 10 can be achieved. This allows the torque output of the drive source 10 to the steel bar after passing through the adjustment device, transmission device 30, and clamping device 40 to be the set torque value. By setting different parameters in the input part for steel bars of different diameters, the device can output different amounts of torque to the steel bars. This makes the torque output of the device controllable and adjustable, making it more convenient to use.

[0074] Preferably, it may also include a torque detection module, which is connected to the power supply module and the controller. The torque detection module is set on the gear shaft of the drive gear 31 and is used to detect the torque output by the drive gear 31 and transmit the torque information to the controller. By detecting the output torque of the drive gear 31, closed-loop control can be completed, making the torque control device more precise in controlling the torque finally output to the steel bar.

[0075] The present invention also includes at least the following advantages: Please see Figure 17 When using this device, the distance between clamping blocks a42 and b43 can be adjusted by bolt a44, allowing the device to adapt to steel bars of different diameters. This solves the problem of needing to replace different specifications of clamps for steel bars of different diameters, thus improving the performance of the device. The inner surface of clamping block a42 is smooth, while the inner surface of clamping block b43 is provided with reverse teeth. The inner surfaces of clamping blocks a42 and b43 form a V-shaped angle. When the steel bar is rotated, the reverse teeth on the inner side of clamping block b43 will clamp the steel bar tighter and tighter, making it difficult for the steel bar to come out between clamping blocks a42 and b43.

[0076] The rotor 33 can be a single unit, with a through hole in the middle. The workpiece passes through the through hole in the middle of the rotor 33 and is clamped by the clamping device 40, which applies a rotational force to tighten the workpiece. Preferably, the rotor 33 includes a radial opening 331, and the rotor 33 is configured to mesh with the intermediate gear 32 during its rotational movement. The opening formed by the clamping blocks a42 and b43 of the clamping device 40 coincides with the radial opening 331 of the rotor 33. By providing the radial opening 331, and when the radial opening 331 rotates to coincide with the opening at the front end of the housing 80, the device can directly mount and clamp the workpiece from the side, without requiring the workpiece to pass through the through hole of the rotor 33 and then be clamped, effectively saving time and processes.

[0077] When the clamping device 40 of this device clamps the workpiece, Figure 2When the clamping device 40 needs to be rotated clockwise to tighten the workpiece, the swing frame 264 is swung to the left, causing the pawl 262 and the limiting groove 253 on the rotating drum 25 to restrict the rotating drum 25 from rotating counterclockwise. The elastic force of the spring a222 pushes the movable block 223 outward in the slider retainer 221, causing the roller 224 at the front end of the movable block 223 to engage with the slot 251. When the load is relatively small, the roller 224 is locked into the slot 251 of the rotating drum 25 and will not come out. The rotating core assembly drives the planetary reduction assembly 24 and the rotating drum 25 to rotate together. The automatic torque adjustment device 20 does not reduce speed, allowing the planetary reduction... The speed-reducing component 24 outputs synchronously with the rotating core component, achieving the technical effect of fast initial twisting speed. When the load continues to increase and reaches a certain threshold, the roller 224 and the movable block 223 can overcome the pressure of the spring a222 and be pressed into the slider retainer 221. The roller 224 slips on the inner ring surface of the rotating drum 25, and the rotating core component and the rotating drum 25 rotate relative to each other. The rotating drum 25 has a tendency to rotate counterclockwise. At this time, the limiting device 26 restricts the rotating drum 25 from rotating counterclockwise. The rotating core component only drives the planetary reduction component 24 to operate. The torque automatic adjustment device 20 starts to reduce the output speed and increase the torque output, achieving the technical effect of low final twisting speed and high torque. exist Figure 2 When the clamping device 40 needs to rotate counterclockwise, the swing frame 264 is swung to the right, causing the pawl 262 and the limiting groove 253 on the rotating drum 25 to restrict the rotating drum 25. Figure 15 Clockwise rotation as shown in the view. Regarding the rebar sleeve, by providing an auxiliary clamping device 70 on the slide rail device 60, the clamping device 40 and the auxiliary clamping device 70 can respectively clamp the rebar b3 and rebar a2. The clamping device 40 drives the rebar b3 to rotate, thus simultaneously tightening both rebar b3 and rebar a2. This allows for single-person tightening, unlike ordinary rebar wrenches which require two people—one to hold one end and the other to tighten the other. By providing a magnetic retainer 61 at the end of the slide rail device 60, containing a strong magnet, the initial working position of the auxiliary clamping device 70 is located at the end of the slide rail device 60. This maximizes the distance between the clamping device 40 and the auxiliary clamping device 70, minimizing the risk of collision or interference between them and the sleeve 1.

[0078] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An open-end electric wrench for connecting reinforcing bars and sleeves, characterized in that, include: Driver source (10); An adjustment device, connected to the drive source (10), is capable of adjusting the torque and / or speed output by the drive source (10); The transmission device (30) is connected to the adjustment device; A clamping device (40) is provided at the end of the transmission device (30); it is used to engage the workpiece and apply a rotational force to the workpiece. A housing (80) is disposed at the front end of the drive source (10); the adjustment device and the transmission device (30) are disposed in the housing (80), and the front end of the housing (80) is provided with an opening; The transmission device (30) includes: The drive gear (31) is connected to the adjustment device; The intermediate gear (32) meshes with the drive gear (31); The rotor (33) meshes with the intermediate gear (32); the clamping device (40) is disposed on the rotor (33); the rotor (33) drives the clamping device (40) to rotate, the rotor (33) includes a radial opening (331), and the rotor (33) is configured to mesh with the intermediate gear (32) during the rotational motion of the rotor (33); there are two intermediate gears (32), distributed on both sides of the drive gear (31), and at least one of the intermediate gears (32) meshes with the rotor (33) during the rotational motion of the rotor (33); The regulating device is an automatic torque regulating device (20), wherein the automatic torque regulating device (20) can automatically increase the output torque according to the increase of load; the automatic torque regulating device (20) includes: The rotating core assembly is connected at one end to the drive source (10), and the drive source (10) drives the rotating core assembly to rotate. The planetary reduction assembly (24) has its central sun gear (243) connected to the other end of the rotating core assembly; Rotary drum (25), the rotating core assembly and the planetary reduction assembly (24) are disposed inside the rotary drum (25); The rotating drum (25) has: A slot (251) is provided inside the rotating cylinder (25) and cooperates with the rotating core assembly; An internal gear (252) is disposed within the rotating cylinder (25) and cooperates with the planetary reduction assembly (24) to form a complete planetary reducer; and A limiting groove (253) is provided outside the rotating drum (25); A limiting device (26) is provided on the housing (80). The limiting device (26) includes a pawl (262). The pawl (262) is biased against the outer side of the upper limit groove (253) of the rotating drum (25) and restricts the rotational movement of the rotating drum (25) in the clockwise or counterclockwise direction. The core assembly has: Rotating core (22), on which a slider retainer (221) is provided; There are two movable blocks (223), and the two movable blocks (223) are slidably installed in the slider holder (221); Spring a (222) is installed between the two movable blocks (223) and pushes them outward; and A roller (224) is rotatably mounted on the outer end of the movable block (223), and the roller (224) engages with the slot (251); When the load is relatively small, the roller (224) is pushed into the slot (251) of the rotating drum (25) by the spring a (222) and the movable block (223) and will not come out. The rotating core assembly drives the planetary reduction assembly (24) and the rotating drum (25) to rotate together. The torque automatic adjustment device (20) does not decelerate, so that the planetary reduction assembly (24) and the rotating core assembly output synchronously. When the load continues to increase to a certain threshold, the roller (224) and the movable block (223) can overcome the pressure of the spring a (222) and be pressed into the slider retainer (221). The rotating core assembly and the rotating drum (25) rotate relative to each other. The rotating drum (25) has a tendency to reverse. At this time, the limiting device (26) restricts the rotating drum (25) from rotating in the opposite direction. The rotating core assembly only drives the planetary reduction assembly (24) to operate. The torque automatic adjustment device (20) starts to decelerate the output and increase the torque output. The front end of the adjustment device is provided with a bevel gear a (23), and the lower part of the drive gear (31) is coaxially provided with a bevel gear b (34), and the bevel gear a (23) and the bevel gear b (34) mesh. The housing (80) is provided with a sliding groove (801), the rotor (33) is provided with a pin a (332), and the pin a (332) is provided with bearings a (333) at both ends, and the bearings a (333) are in rolling contact with the sliding groove (801).

2. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, The housing (80) is provided with a pin b (802), a roller (803) is installed on the pin b (802), and a groove b (334) is provided on the rotor (33). The roller (803) and the groove b (334) are in rolling contact.

3. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, It also includes a torque limiter, which cuts off the power output from the drive source (10) to the torque automatic adjustment device when the load reaches a certain threshold.

4. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, The planetary deceleration assembly (24) includes: Planetary frame (241); Planetary gears (242) are rotatably mounted on the planet carrier (241) and mesh with the internal teeth (252) of the rotating cylinder (25); The sun gear (243) is located inside the planet carrier (241) and connected to the other end of the rotating core (22). The sun gear (243) meshes with the planet gear (242), and the planet carrier (241) outputs power.

5. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, The limiting device (26) further includes: The base (261) is mounted on the housing (80); The swing frame (264) is rotatably mounted on the base (261); Spring b (263), one end of which is connected to the swing frame (264); the other end of spring b (263) is connected to the pawl (262); and Two magnets (265) are provided on both sides of the base (261). The magnets (265) can hold the swing frame (264) in the corresponding position after the swing frame (264) is manually switched by adsorption. The swing frame (264) drives the spring b (263) to swing, so that the spring b (263) drives the pawl (262) to deflect to the left or right, and the pawl (262) is locked in the limiting groove (253) to restrict the rotation of the drum (25) in the clockwise or counterclockwise direction.

6. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, The clamping device (40) includes: Support frame a (41); Clamping block a (42) is disposed on the support frame a (41); Clamping block b (43) is disposed on the support frame a (41); and Bolt a (44) connects the clamping block a (42) and the clamping block b (43) to adjust the distance between the clamping block a (42) and the clamping block b (43); The inner surface of clamping block a (42) is smooth, and the inner surface of clamping block b (43) is provided with teeth.

7. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 1, characterized in that, Also includes: The slide rail device (60) is located on the opposite side of the clamping device (40); Auxiliary clamping device (70); It is mounted on the slide rail device (60).

8. The open-end electric wrench for connecting reinforcing bars and sleeves according to claim 7, characterized in that, The auxiliary clamping device (70) includes: Support frame b (71); A rolling shaft (75) is rotatably mounted on the support frame b (71), and the support frame b (71) is rotatably connected to the slide rail device (60) through the rolling shaft (75); Clamping block c (72) is disposed on the support frame b (71); Clamping block d (73) is disposed on the support frame b (71); and Bolt b (74) connects the clamping block c (72) and the clamping block d (73) to adjust the distance between the clamping block c (72) and the clamping block d (73); The inner surface of clamping block c (72) is smooth, and the inner surface of clamping block d (73) is provided with teeth.

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