Automatic electric wrench for steel sleeve connection

Abstract

The application discloses an automatic electric wrench for reinforcing steel sleeve connection, which comprises a shell main body, a rotating assembly, an electric device and a supporting device; one end of the shell main body is a counterforce arm; one end of the shell main body is a circular arc body, and the circular arc body is circumscribed by an arc body; one end of the circular arc body is rotationally connected with one end of the arc body, and the other end is detachably connected; a plurality of grooves are formed in the top surfaces of the circular arc body and the arc body; a ring-shaped sliding groove is arranged on the inner ring of the circumferences of the circular arc body and the arc body; an arc-shaped earring extending in the direction of the circumferential outer wall of the rotating assembly is clamped into the ring-shaped sliding groove; a gear ring is distributed on the outer circumferential wall of the rotating assembly, and a rotating gear connected with the electric device is engaged with the gear ring. The application solves the problems of the existing electric wrench, such as complex structure, large weight, time-consuming and laborious manual operation, and inclination or falling of the wrench during the working process due to the self-weight bias.

Description

Technical Field

[0001] This invention relates to electric wrenches, and more particularly to an electric wrench for automated rebar sleeve connection. Background Technology

[0002] With the widespread application of mechanical connections for reinforcing bars, electric wrenches have also developed rapidly. Many new-generation electric wrenches for connecting reinforcing bars have emerged. However, after practical engineering applications, they all exhibit numerous drawbacks. For example, since connecting reinforcing cages typically involves tightening the sleeve, the required torque is relatively large.

[0003] Existing electric wrenches consist of large motors and multiple electronic components, making them bulky, heavy, and poorly portable. Workers need to hold these heavy electric wrenches for extended periods, which is extremely physically demanding. Secondly, while current automated electric wrenches eliminate the need for manual operation, heavy automated wrenches often experience uneven tightening due to their own weight, causing them to tilt or slip off the socket, thus affecting the connection quality of the rebar sleeve.

[0004] The prior art, disclosed in CN113618669A, is an electric wrench and an electric wrench device, belonging to the field of electric wrench technology. The electric wrench includes: a housing, a controller, a detection device, an input device, and a clamping device. The input device is disposed on the outer wall of the housing and is used to receive tightening commands. The clamping device is rotatably disposed in the housing and is used to clamp a rebar sleeve. The controller is disposed inside the housing and electrically connected to both the input device and the clamping device, and is used to receive tightening commands and control the clamping device to rotate according to the tightening commands, thereby driving the rebar sleeve to rotate and tighten with the rebar. The detection device is disposed inside the housing and connected to the clamping device, and is used to detect the degree of rotation of the clamping device. The controller is also electrically connected to the detection device, and is used to determine whether the rebar sleeve and the rebar are tightened according to the degree of rotation, and to control the clamping device to stop rotating after tightening. This electric wrench device has a complex structure and is heavy. During tightening, the weight of the wrench itself causes bias pressure, and automatic tightening may result in biased tightening and wrench slippage.

[0005] In existing automated electric wrenches, the significant weight-based force during automatic tightening causes the force on the internal meshing teeth to constantly change with the rotation of the rotating body. This results in severe and uneven force distribution on each meshing tooth, easily leading to problems such as the wrench slipping off. Furthermore, the weight-based force can cause misaligned tightening, resulting in the socket being subjected to skewed force. When the electric wrench detects the set torque, the actual torque on the socket is lower than expected, affecting the wrench's tightening torque accuracy. Existing electric wrenches are complex in structure, heavy, and require time and effort for manual operation. Automated electric wrenches, affected by their own weight and bias, are prone to tooth slippage and misaligned tightening. Therefore, there is an urgent need for a lightweight automated electric wrench that eliminates the weight-based bias problem. Summary of the Invention

[0006] Purpose of the invention: To address the shortcomings of existing technologies, this invention provides an automated electric wrench for connecting rebar sleeves. By improving the structure of the electric wrench, the wrench is integrated with the engagement and rotation components, reducing its size. It eliminates the impact of the wrench's own weight on the rebar sleeve connection, solves the problem of the automated electric wrench tilting or slipping due to its own weight, and improves the accuracy of the wrench's tightening torque and the quality of the rebar sleeve connection.

[0007] Technical solution: The electric wrench for automated rebar sleeve connection of the present invention includes a housing body, a rotating component, an electric device, and a support device; one end of the housing body is a reaction arm;

[0008] One end of the outer shell is an arc shape, and an arc shape is attached to the outside of the arc shape; one end of the arc shape is rotatably connected to one end of the arc shape, and the other end is detached from the connection.

[0009] The top surface of the arc-shaped body and the curved body are provided with multiple grooves; the inner circumference of the arc-shaped body and the curved body is provided with a ring-shaped sliding groove;

[0010] The rotating assembly includes an upper rotating body and a lower rotating body, with the outer circumferential walls of the upper and lower rotating bodies extending downward to form arc-shaped earrings that fit into an annular groove.

[0011] Gear rings are distributed on the outer circumferential wall of the rotating component. The gear rings mesh with a rotating gear connected to an electric device. The rotating gear is connected to a rotating motor.

[0012] The support device includes multiple support frames, with a gripper at the top of the support frame that matches the outer ring size of the sleeve, and the gripper extending downward to a support seat that engages with a groove.

[0013] The upper and lower rotating bodies are semi-circular arcs, and the upper and lower rotating bodies are joined together to form a ring.

[0014] The outer circular sidewall of the upper rotating body is covered with teeth-like structures, which are joined with the teeth-like structures of the lower rotating body to form a toothed ring on the sidewall.

[0015] The inner circumferential wall of the rotating component is provided with a striped tooth-like band composed of interlocking teeth, which extend obliquely vertically from the upper edge to the lower edge of the rotating component.

[0016] The electric actuator includes a digital display, a detection device, and a rotary motor, with a rotating rod connected between the rotary motor and the rotating gear.

[0017] The upper end of the gripper is provided with a gripper flange, and the lower end is provided with a gripper sidewall. The gripper flange is attached to the upper end face of the sleeve; the gripper sidewall is attached to the sidewall of the sleeve.

[0018] It also includes a rotating bearing, with one end of the circular body and one end of the arc-shaped body rotatably connected by the rotating bearing.

[0019] The other end of the arc has an upper half pin hole, and the other end of the arc has a lower half pin hole. A threaded pin is inserted between the upper half pin hole and the lower half pin hole, and the pin is locked by the thread.

[0020] The support base is concave in the middle and convex at both ends, extending downwards from the bottom of the gripper. The structure of the support base matches the structure of the groove on the top surface of the arc and the arc-shaped body. The length of the groove is less than the thickness of the outer shell wall to prevent the support frame from slipping out.

[0021] The edge of the curved earring has hooks that engage with the annular groove to prevent the rotating components from slipping out.

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

[0023] (1) Compared with traditional automatic electric wrenches, the automatic electric wrench of the present invention omits components such as the transmission device, the locking teeth and the output end, optimizes and simplifies the structure of the electric wrench, reduces the volume, and makes the electric wrench lighter and more convenient.

[0024] (2) This invention is applicable to working conditions where the operating space is severely limited, such as the connection of steel sleeves in steel cages, and the support frame of this invention corresponds one-to-one with the sleeve specifications. The upper end of the gripper in the support frame is provided with a gripper flange, and the lower end is provided with a gripper sidewall. The gripper flange hangs against the upper end face of the tightening sleeve to balance the weight of the wrench; the gripper sidewall abuts against the sidewall of the tightening sleeve to balance the bias pressure caused by the weight of the wrench, preventing the bias pressure of the wrench from acting on the meshing teeth, so that the meshing teeth are subjected to uniform force. This solves the problem of automatic electric wrenches being tilted or slipping due to the bias pressure of their own weight, and improves the tightening torque accuracy of the wrench and the connection quality of the steel sleeve. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the front axial side structure of the electric wrench for automated rebar sleeve connection according to the present invention;

[0026] Figure 2 This is a side view of the electric wrench for automated rebar sleeve connection according to the present invention.

[0027] Figure 3 This is a cross-sectional view of the electric wrench for automated rebar sleeve connection of the present invention along the centerline;

[0028] Figure 4 This is a schematic diagram of the structure of the outer casing of the electric wrench for automated rebar sleeve connection according to the present invention;

[0029] Figure 5 This is a schematic diagram of the rotating motor in the electric wrench for automated rebar sleeve connection of the present invention;

[0030] Figure 6 This is a schematic diagram of the rotating body in the electric wrench for automated rebar sleeve connection of the present invention;

[0031] Figure 7 This is a schematic diagram of the middle support frame of the electric wrench for automated rebar sleeve connection of the present invention;

[0032] Figure 8 This is a schematic diagram showing the working state of the electric wrench for automated rebar sleeve connection according to the present invention;

[0033] Figure 9 This is a schematic diagram of the working principle of the support frame gripper in the electric wrench for automated rebar sleeve connection of the present invention. Detailed Implementation

[0034] like Figure 1 and Figure 2 As shown, the electric wrench for automated rebar sleeve connection of the present invention includes a housing body 1, a rotating assembly, an electric device, and a support device. One end of the housing body 1 is an arc shape, and an arc-shaped body 2 is attached to the outside of the arc shape; one end of the arc shape is rotatably connected to one end of the arc-shaped body 2, and the other end is detachably connected.

[0035] In this embodiment, the rotating assembly includes an upper rotating body 3 and a lower rotating body 4. Both rotating bodies have identical structures and are slidably connected within the annular groove 23 of the arc-shaped body and the curved body 2 inside the outer shell. The support device includes a first support frame 5, a second support frame 6, and a third support frame 7, each with an identical structure.

[0036] like Figure 3 and Figure 4As shown, in this embodiment, one end of the outer casing 1 is a 180° semicircular arc. Two identical "I"-shaped grooves are formed on the top surface of the arc: groove 18 and groove 19. An annular groove 23 is provided around the inner circumference of the semicircular arc. An upper pin hole 21 is provided at one end of the outer circumference, and a pivot hole is provided at the other end. The rear half of the outer casing 1 includes a chassis and a reaction arm 14. A main switch 11 and a digital display 13 are located on the top of the chassis, a start switch 10 is located on the side wall, and a hollow cylindrical reaction arm 14 is fixedly connected to the rear. A power socket 12 is located below the reaction arm 14 and at the bottom of the chassis.

[0037] Figure 4 The arc-shaped body 2 is a 180° arc. The top surface of the arc has a third groove 20 with the same structure as the first groove 18 and the second groove 19. The inner circumference of the arc has a ring groove 23, which is spliced ​​with the ring groove 23 of the outer shell to form a ring. The outer end of the ring has a lower half pin hole 22, and the other end has a pivot hole.

[0038] The outer shell body 1 and the arc-shaped body 2 are rotatably connected at one end by a rotating bearing 8, and detachably connected at the other end by a pin lock 9. The rotating shaft hole at the end of the outer shell body 1 and the rotating shaft hole at the end of the arc-shaped body 2 are rotatably connected by the rotating bearing 8. The rotating bearing 8 is an inherent connection of the outer shell itself and does not require operation during use. The upper half pin hole 21 at the other end of the outer shell body 1 and the lower half pin hole 22 at the other end of the arc-shaped body 2 are detachably connected by a pin. The inner wall of the pin hole of the pin lock 9 and the pin are both threadedly matched.

[0039] like Figure 4 and Figure 6 As shown, the rotating component is slidably connected to the annular groove 23 of the outer shell via the earring 28. The upper and lower rotating bodies have the same structure, both being 180° arcs in shape. They can be joined end to end to form a ring. Arc-shaped earrings 28 extend from the outer circumference of the upper and lower rotating bodies 2 and 4. The earrings have downward hooks on their edges, which engage in the annular groove 23 to prevent the rotating components from slipping out. The arc-shaped earrings 28 match the contour of the annular groove 23 of the device shell. The upper and lower rotating bodies 3 and 4 are slidably connected in the annular groove 23 through the earrings 28. Irregular striped tooth-like bands composed of interlocking teeth 29 are distributed on the inner circumferential wall of the rotating body. The interlocking teeth 29 extend from the upper edge to the lower edge of the rotating body in a diagonal vertical direction. The interlocking teeth stripes are long and deep. The diagonal vertical stripes engage with the horizontal lines on the outer surface of the sleeve, thereby locking the sleeve. The height of the rotating body is not too high to ensure that the interlocking teeth are fully engaged with the outer surface of the sleeve, so that the teeth fully contact the sleeve to play their role. Since the lower rotating body 4 and the upper rotating body 3 have the same structure, they have the same characteristics. Different sizes of sleeves correspond to different models of rotating bodies, and each size of sleeve corresponds to a set of rotating bodies.

[0040] like Figures 3 to 5 As shown, the electric actuator includes a digital display 13, a detection device 15, and a rotary motor 16. The rotary motor 16 is fixed inside the housing 1. One end of a rotating rod 25 is fixedly connected to the rotating end of the rotary motor 16 and rotates with the rotary motor 16; the other end passes through the opening 24 of the housing and enters the jaw 17 of the housing, where a rotating gear 26 is fixedly connected. The rotating gear 26 rotates in tandem with the rotating rod 25. The rotating gear 26 matches and rotates with the side-wall toothed rings 27 distributed on the outer circumferential wall of the rotating assembly. The rotation of the rotating gear 26 drives the rotating assembly to rotate. Both the rotating gear 26 and the side-wall toothed rings 27 avoid using excessively large tooth sizes to prevent excessive tooth gaps from affecting the tightening torque accuracy of the wrench. The rotary motor 16 acts directly on the rotating assembly through the rotating gear 26, driving the rotating assembly to rotate. The detection device 15 is fixedly installed inside the housing and connected between the rotary motor 16 and the digital display 13. The digital display 13 has a screen on the upper surface of the housing body 1 and is touch-operated.

[0041] like Figure 7 As shown, each support frame has the same structure. The upper part of the first support frame 5 is an arc-shaped gripper 32, the arc size of which matches the outer ring size of the sleeve. The gripper 32 is engaged with the outer edge of the upper end of the sleeve. The bottom extends downward to form a support seat 30 with a concave center and convex sides. The support seat 30 matches and is detachably connected to the groove 18 of the outer shell. The length of the groove 18 is less than the wall thickness of the outer shell to prevent the support frame from slipping out. The gripper 32 and the support seat 30 are fixedly connected by a support rod 31.

[0042] like Figure 9 As shown, each support frame 5 has a gripper flange 33 at the upper end and a gripper sidewall 34 at the lower end of the gripper 32. When the electric wrench is working, the gripper flange 33 is attached to the upper end face of the tightening socket to support the electric wrench and balance its own weight. The gripper sidewall 34 is attached to the side wall of the tightening socket to balance the bias pressure of the electric wrench and prevent the wrench from being applied under bias or slipping.

[0043] like Figures 7 to 9 As shown, the upper gripper flange 33 of the gripper 32 of the support frame 5 rests against the upper end face of the sleeve, and the outer edge of the gripper flange 33 must not be too long to touch the reinforcing bar being tightened; the lower gripper sidewall 34 rests against the outer circumferential wall of the sleeve to prevent the electric wrench from biasing and causing tilting; the vertical height of the support rod 31 does not exceed half the length of the sleeve.

[0044] When tightening sockets of different sizes with an electric wrench, the corresponding support frame should be replaced. Because different sizes of rebar connections require the use of corresponding sockets, corresponding support devices are also used; one size of socket corresponds to one set of support devices, and one set of support devices contains three support frames with identical structures and the same installation principle.

[0045] The method of using the electric wrench for automated rebar sleeve connection of this invention is as follows:

[0046] (1) Determine the specifications and dimensions of the tightening sleeve, and select a set of corresponding rotating bodies and support frames. In this embodiment, two rotating bodies and three support frames are used.

[0047] (2) Figure 4 As shown, rotate and pull out the pin lock 9 to open the arc-shaped body 2;

[0048] (3) Figure 1 , Figure 3 and Figure 6 As shown, the upper rotating body 3 is slidably connected to the annular groove 23 of the outer shell body 1 via the arc-shaped earring 28 on its upper edge. The lower rotating body 4 is slidably connected to the annular groove 23 of the arc-shaped body 2 in the same manner.

[0049] (4) Figure 7 As shown, the selected support frame is inserted into the groove on the top surface of the arc-shaped body and the curved body. The first support frame 5 is inserted into the first groove 18 on the outer shell through the bottom support base 30; the second support frame 6 and the third support frame 7 are inserted into the second groove 19 and the third groove 20 respectively in the same manner.

[0050] (6) Figure 7 and Figure 8 As shown, insert the tightening sleeve, and first, clamp the handles 32 of support frame 5 and support frame 6 against the outer edge of the upper end of the tightening sleeve, i.e. Figure 9 As shown, the gripper flange 33 rests against the upper end face of the tightening sleeve; the gripper sidewall 34 rests against the sidewall of the tightening sleeve, and at this time, the meshing teeth on the rotating assembly are also engaged against the outer circumferential wall of the sleeve; then rotate as shown Figure 1 As shown, the closed outer shell of the arc-shaped body 2 allows the gripper 32 on the upper part of the third support frame 7 to automatically engage with the outer edge of the upper end of the tightening socket. The three support frames work together to balance the weight and bias of the electric wrench, preventing the risk of uneven tightening or slippage caused by uneven force on the meshing teeth during operation.

[0051] (7) Figure 4 As shown, the rotating pin lock 9 locks the rotating body into a rotating ring. Adjust the electric wrench so that the reaction arm 14 is against the adjacent steel bar.

[0052] (8) Figure 8 As shown, connect the power socket 12, turn on the main switch 11, and manually input the tightening torque value on the digital display 13.

[0053] (9) such as Figure 8 As shown, turn on the start switch 10, as indicated. Figure 5 When the rotating motor 16 is activated, the rotating gear 26 drives the sidewall toothed ring 27 on the outer circumferential wall of the rotating body to rotate, automatically completing the tightening of the sleeve. After tightening is completed, the start switch 10 automatically turns off, and the rotating motor 16 stops working.

[0054] To more intuitively demonstrate the impact of electric wrench tilting on wrench torque accuracy, the experimental process of this embodiment is as follows:

[0055] A handheld electric wrench was used to apply a torque of 260 N·m to a 25 mm diameter rebar sleeve. Working condition 1: 8 sets of horizontal tightening (normal tightening) with the handheld electric wrench; Working condition 2: 8 sets of tightening with the electric wrench in its natural position (oblique tightening). The actual torque of each rebar connection was checked using an inspection instrument, as shown in Table 1.

[0056] Table 1. Actual torque of M25 steel bars under different tightening conditions.

[0057]

[0058] The above test data shows that when the electric wrench is applied at an angle, the actual torque obtained by the socket is smaller, with an error of ≤5%. If the electric wrench avoids the influence of its own weight on horizontal tightening, the error between the actual torque of the socket and the set torque of the electric wrench is reduced. Therefore, the automated electric torque wrench of this invention solves the problem of wrench self-weight bias and improves the torque accuracy of the wrench.

Claims

1. An automated electric wrench for connecting rebar sleeves, characterized in that: it includes a housing body (1), a rotating assembly, an electric device, and a support device; one end of the housing body (1) is a reaction arm; One end of the outer shell body (1) is an arc body, and an arc body (2) is attached to the outside of the arc body; one end of the arc body is rotatably connected to one end of the arc body (2), and the other end is detached from the connection; The top surface of the arc body and the arc-shaped body (2) is provided with multiple grooves; the inner circumference of the arc body and the arc-shaped body is provided with a ring-shaped groove (23); The rotating assembly includes an upper rotating body (3) and a lower rotating body (4), and the outer circumferential walls of the upper and lower rotating bodies extend downward to form an arc-shaped earring (28) that fits into an annular groove (23); A toothed ring (27) is distributed on the outer circumferential wall of the rotating component. The toothed ring (27) meshes with a rotating gear (26) connected to an electric device. The rotating gear (26) is connected to a rotating motor (16). The support device includes multiple support frames, the upper part of which is a gripper (32) that matches the outer ring size of the sleeve, and the gripper (32) extends downward to form a support seat (30) that engages with the groove; The inner circumferential wall of the rotating component is provided with a striped tooth-like band composed of interlocking teeth (29), which extend from the upper edge of the rotating component to the lower edge of the rotating component in an oblique vertical direction; The gripper (32) has a gripper flange (33) at its upper end and a gripper sidewall (34) at its lower end. The gripper flange (33) is attached to the upper end face of the sleeve. The gripper sidewall (34) is attached to the side wall of the sleeve.

2. The electric wrench for automatic rebar sleeve connection according to claim 1, characterized in that: the upper half rotating body (3) and the lower half rotating body (4) are semi-circular arc-shaped bodies, and the upper half rotating body and the lower half rotating body are spliced ​​together to form a ring body.

3. The electric wrench for automatic rebar sleeve connection according to claim 2 is characterized in that: the outer circular sidewall of the upper rotating body (3) is provided with teeth-like structures, and the teeth-like structures are spliced ​​with the teeth-like structures of the lower rotating body (4) to form a toothed ring (27) on the sidewall.

4. The electric wrench for automatic rebar sleeve connection according to claim 1, characterized in that: the electric device includes a digital display (13), a detection device (15) and a rotating motor (16), and a rotating rod (25) is connected between the rotating motor (16) and the rotating gear (26).

5. The electric wrench for automatic rebar sleeve connection according to claim 1, characterized in that: it further includes a rotating bearing (8), one end of the arc body and one end of the arc body (2) are rotatably connected through the rotating bearing (8).

6. The electric wrench for automatic rebar sleeve connection according to claim 5, characterized in that: the other end of the arc body has an upper half pin hole (21), the other end of the arc body (2) has a lower half pin hole (22), and a threaded pin is inserted between the upper half pin hole (21) and the lower half pin hole (22).

7. The electric wrench for automatic rebar sleeve connection according to claim 1, characterized in that: the support base (30) is a shape that is concave in the middle and convex on both sides, matching the groove structure.

8. The electric wrench for automatic rebar sleeve connection according to claim 1, characterized in that: the edge of the arc-shaped earring (28) is provided with a hook that engages in the annular groove (23).

Images