Electric torsional shear wrench

Abstract

The utility model relates to the technical field of electric tools, and discloses an electric torsional shear wrench which comprises a main body shell, a locking and breaking structure installed on the front portion of the main body shell, a broken block discharging structure installed in the main body shell and a driving structure. The broken block discharging structure comprises an ejector rod which is arranged in the main body shell and can move back and forth; the driving structure comprises a motor, a driving part, a rotating cover and a transmission mechanism, the rotating cover is rotatably installed in the main body shell, the motor is installed on the rear side of the main body shell, a motor output shaft is arranged in the rotating cover, the driving part used for driving the rotating cover to rotate is fixed to the motor output shaft, and the rotating cover drives the locking structure to rotate through the transmission mechanism; the distance between the axis of the ejector rod and the axis of the output shaft of the motor is larger than the radius of the ejector rod and the radius of the driving component. The motor can be installed right behind the motor, bevel gear steering is not needed, multi-stage intermediate gear transmission is not needed either, kinetic energy loss is small, and manufacturing cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, and more specifically to an electric torsion shear wrench. Background Art

[0002] The electric tools currently used to lock the shear bolts, after a nut is tightened on the shear bolt, will then apply a rotational force to the shear bolt to twist off the end of the shear bolt and eject it. Currently, there are two types of broken piece ejection mechanisms: electromagnetic and mechanical. The electromagnetic broken piece ejection structure can achieve broken piece ejection without significantly affecting the mechanical structure of the electric tool head, but the electromagnetic broken piece ejection structure consumes electrical energy, and the endurance of the electric tool is lower than that of the electric tool using the mechanical broken piece ejection structure.

[0003] The invention patent application with application publication number CN111136608A discloses an electric tool; a pinion is formed at the upper end of the motor shaft of the electric motor, and the pinion is engaged with a first intermediate gear arranged in the head shell, and the first intermediate gear is engaged with a second intermediate gear, and the shaft of a third intermediate gear is coaxially embedded with the rotating shaft of the second intermediate gear, and the upper end of the third intermediate gear becomes a bevel gear, and the bevel gear is engaged with a bevel gear arranged at the rear end of a fourth intermediate gear, and the rotational force transmitted from the motor shaft can be converted from the up and down direction to the front and back direction.

[0004] In the above scheme, because the broken block rod is long and the moving stroke of the broken block rod is long, a large space is required, and the motor output shaft will interfere with the broken block rod, so the motor cannot be installed directly behind it. In this scheme, the motor needs to be installed at the bottom, and the power is transmitted to the fourth intermediate gear through the pinion, the first intermediate gear, the second intermediate gear, the third intermediate gear, and the bevel gear in sequence to drive the front outer sleeve to rotate; this method has many transmission parts, large kinetic energy loss, and high manufacturing cost. Utility Model Content

[0005] The utility model aims to overcome the defects of the above-mentioned prior art and provide an electric torsion shear wrench for solving the technical problems that the motor cannot be installed directly behind the broken block rod due to its long moving stroke and large space required, and the motor needs more transmission parts to transmit power if it is installed below, resulting in large kinetic energy loss and high manufacturing cost.

[0006] The technical solution adopted by the utility model is an electric torsion shear wrench, comprising a main body shell, a locking structure installed on the front part of the main body shell, a broken piece discharge structure and a driving structure installed inside the main body shell; the broken piece discharge structure comprises a push rod which is arranged in the main body shell and can move forward and backward; the driving structure comprises a motor, a driving component, a rotating cover and a transmission mechanism, the rotating cover is rotatably installed in the main body shell, the motor is installed on the rear side of the main body shell, the motor output shaft is arranged in the rotating cover, and a driving component for driving the rotating cover to rotate is fixed thereon, and the rotating cover drives the locking structure to rotate through the transmission mechanism; the distance from the axis of the push rod to the axis of the motor output shaft is greater than the radius of the push rod plus the radius of the driving component.

[0007] The motor drives the rotating cover to rotate through the driving component, and the rotating cover drives the locking structure to rotate through the transmission mechanism, so that the locking structure can tighten and shear the plum head of the bolt. The rotating cover has a large internal space, and the motor output shaft and the driving component can be arranged in the rotating cover. The push rod does not interfere with the motor output shaft and the driving component when moving forward and backward. The motor can be installed directly behind it. It does not require bevel gear steering or multi-stage intermediate gear transmission. The kinetic energy loss is small, which can effectively reduce the manufacturing cost.

[0008] Furthermore, the driving component is a gear, and a gear ring is provided on the inner side of the rotating cover, and the gear meshes with the gear ring. The gear ring and the gear meshing mode can directly reduce the speed of the motor output and increase the torque, and do not require multi-stage intermediate gears. At the same time, the motor output shaft, the driving component and part of the rotating cover occupy the same vertical space, which can save lateral space.

[0009] Furthermore, the rotating cover includes an entry sleeve and an expansion cover, the entry sleeve and the expansion cover are integrally formed, and the expansion cover is in an outwardly expanding shape starting from the entry sleeve. The expansion cover expands outward from the middle, thereby forming a larger space inside, so as to set the driving components and the motor output shaft, and also compatible with the moving stroke of the ejector rod, so as to reduce the number of transmission parts, reduce kinetic energy loss, and reduce manufacturing costs.

[0010] Furthermore, the block ejection structure also includes a spring 1 and a limiting mechanism. The spring is connected to the ejector rod. When the ejector rod moves to the rear side of the main shell, the spring 1 is compressed. A circle of limiting grooves is provided at the tail of the ejector rod, and a limiting convex column is formed at the tail end of the ejector rod. The limiting mechanism is installed in the main shell. When the ejector rod moves to the rear side of the main shell, the limiting mechanism fixes it through the limiting groove. The spring 1 is mainly used to accumulate energy. When the ejector rod is released from the limit, the ejector rod can quickly move forward to eject the bolt head from the locking structure through rebound.

[0011] Furthermore, the limiting mechanism includes a fixed cover, a card plate, a second spring and a connecting rod assembly. The fixed cover is fixedly connected to the main shell, and a plug-in sleeve is provided on the fixed cover, and the push rod is plugged into the inner hole of the plug-in sleeve; the card plate can be installed in the fixed cover vertically movably, and a countersunk hole for the push rod to enter is provided on the card plate, and a limiting protrusion is formed in the countersunk hole, and the limiting protrusion is plugged into the limiting groove. A mounting hole is provided on the bottom side of the card plate, one end of the second spring is arranged in the mounting hole, and the other end is against the inner wall of the fixed cover; the second spring, the limiting protrusion and the push rod are arranged in a vertical direction from bottom to top, and the connecting rod assembly is used to drive the card plate to move vertically. When the locking structure is inserted into the bolt head, the bolt head pushes the limiting boss into the countersunk hole. After the limiting protrusion is aligned with the limiting groove, the second spring rebounds and pushes the card plate to move upward, the limiting protrusion is stuck in the limiting groove, and the push rod is limited and fixed; when loosened, the card plate is driven downward through the connecting rod assembly, so that the second spring is compressed, the limiting protrusion disengages from the limiting groove, the rear end of the push rod is released from the restriction, and the push rod is rebounded by the first spring and moves forward, thereby pushing out the plum blossom head of the bolt in the locking structure. This method can realize automatic limiting, is portable to operate, and provides a better user experience.

[0012] Furthermore, the fixed cover is arranged inside the rotating cover, the outer diameter of the plug sleeve is smaller than the inner diameter of the entry sleeve, the plug sleeve is arranged inside the entry sleeve, and the rotating cover is optionally connected to the fixed cover in a rotatable manner. The outside of the rotating cover is positioned by the main body shell, and the fixed cover is arranged inside the rotating cover, which can support and stabilize the inside of the rotating cover, and can further improve the stability of the rotating cover when rotating. The fixed cover is provided with a clearance opening for exposing a portion of the gear ring that meshes with the driving component.

[0013] Furthermore, the connecting rod assembly includes a U-shaped part, a lever and a trigger. The trigger and the lever are rotatably connected to the main shell. The U-shaped part is installed in the main shell so as to be vertically movable. The inner side of one end of the U-shaped part overlaps the top of the clamping plate, one end of the lever overlaps the inner side of the other end of the U-shaped part, and the other end of the lever overlaps the trigger. The trigger can drive the U-shaped part to move downward through the lever.

[0014] Furthermore, the front side of the limiting protrusion is provided with a first guiding slope, and the rear end of the limiting boss is provided with a second guiding slope, and the first guiding slope is slidably matched with the second guiding slope. Through the guiding effect of the first guiding slope and the second guiding slope, when the clamping plate is located at a relatively upper position, the limiting boss can also be quickly inserted into the countersunk hole, which can prevent the limiting boss from interfering with the limiting protrusion.

[0015] Furthermore, the rear end face of the limiting protrusion is a clamping surface that gradually tilts from the center of the countersunk hole outward toward the front side of the main body shell, and when the limiting protrusion is plugged into the limiting groove, the front end face of the limiting convex column contacts the clamping surface. The clamping surface is inclined and has a guiding effect. When vibration occurs, it provides a force for the ejector rod and the clamping plate to move toward each other, thereby preventing the ejector rod and the limiting protrusion from being disengaged when vibration occurs.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: in this solution, the rotating cover has a larger internal space, the motor output shaft and the driving components can be arranged in the rotating cover, and the push rod does not interfere with the motor output shaft and the driving components when moving forward and backward, and the motor can be installed directly behind it. There is no need for bevel gear steering or multi-stage intermediate gear transmission, the kinetic energy loss is small, and the manufacturing cost can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a sectional view of the overall structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the driving structure of the utility model.

[0019] Figure 3 For this utility model Figure 2 A magnified view of the local structure at point A.

[0020] In the figure: 1. main body shell, 2. locking structure, 3. broken block discharge structure, 4. driving structure, 5. push rod, 6. motor, 7. driving component, 8. rotating cover, 9. transmission mechanism, 10. entering sleeve, 11. extension cover, 12. gear ring, 13. spring 1, 14. limiting mechanism, 15. limiting groove, 16. limiting convex column, 17. fixed cover, 18. clamping plate, 19. spring 2, 20. connecting rod assembly, 21. guiding inclined plane 1, 22. guiding inclined plane 2, 23. clamping surface, 24. mounting hole, 25. U-shaped part, 26. lever, 27. trigger, 28. plug-in sleeve, 29. countersunk hole, 30. limiting protrusion. DETAILED DESCRIPTION

[0021] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0022] like Figure 1-3As shown, the present invention discloses an electric torsion shear wrench, comprising a main body shell 1, a locking structure 2 installed at the front of the main body shell 1, a broken piece discharge structure 3 and a driving structure 4 installed inside the main body shell 1, the locking structure 2 is used to tighten the high-strength torsion shear bolts, and the broken piece discharge structure 3 is used to pop out the cut plum blossom head from the locking structure 2 after the tightening and shearing are completed, and the driving structure 4 is used to drive the locking structure 2 to rotate.

[0023] The locking structure 2 is a commonly used structure in existing electric torsion shear wrenches and is a well-known technology in the art. It will not be described in detail here. The broken block discharge structure 3 includes a push rod 5 that can move forward and backward in the main shell 1. The push rod 5 is used to push out the plum blossom head in the locking structure 2.

[0024] The driving structure 4 includes a motor 6, a driving component 7, a rotating cover 8 and a transmission mechanism 9; the rotating cover 8 is rotatably installed in the main shell 1, and the rotating cover 8 includes an entry sleeve 10 and an extension cover 11. The entry sleeve 10 and the extension cover 11 are integrally formed. Starting from the entry sleeve 10, the extension cover 11 is in an outwardly expanding shape. The rotating cover 8 is: a rotating part with the axis of the entry sleeve 10 as the center line, and a gear ring 12 is provided at the larger end of the extension cover 11. The gear ring 12 can be set on the inner side of the larger end of the extension cover 11, and can also be set on the outer side of the larger end of the extension cover 11; the larger ends of the entry sleeve 10 and the extension cover 11 are rotatably connected to the main shell 1 through bearings.

[0025] The motor 6 is installed at the rear side of the main housing 1. The output shaft of the motor 6 is fixed with a driving component 7. The driving component 7 is preferably a spur gear. The driving component 7 is meshed with the ring gear 12. The driving component 7 and the ring gear 12 can also be replaced by other transmission mechanisms. For example, the driving component 7 can also be a helical gear, and the ring gear 12 is a helical ring gear. The output shaft of the motor 6 drives the rotating cover 8 to rotate through the driving component 7 and the ring gear 12, and the rotating cover 8 drives the locking structure 2 to rotate through the transmission mechanism 9. When the ring gear 12 is arranged on the inner side of the larger end of the expansion cover 11, the distance from the axis of the push rod 5 to the axis of the output shaft of the motor 6 is greater than the radius of the push rod 5 plus the radius of the driving component 7, so as to prevent the push rod 5 from interfering with the driving component 7 when it moves forward and backward.

[0026] The broken block discharge structure 3 also includes a spring 13 and a limiting mechanism 14. The spring 13 is sleeved on the push rod 5. When the push rod 5 moves to the rear side of the main shell 1, the spring 13 is compressed. A circle of limiting grooves 15 are arranged at the tail of the push rod 5. A limiting protrusion 16 is formed at the tail end of the push rod 5. The limiting mechanism 14 is installed in the main shell 1. When the push rod 5 moves to the rear side of the main shell 1, the limiting mechanism 14 fixes it through the limiting groove 15; when the limiting mechanism 14 releases the restriction on the limiting groove 15, the push rod 5 is rebounded and pushed forward by the spring 13, thereby pushing the cut plum blossom head out of the locking structure 2.

[0027] The limiting mechanism 14 includes a fixed cover 17, a clamping plate 18, a spring 19 and a connecting rod assembly 20. The fixed cover 17 is fixedly connected to the main shell 1. The fixed cover 17 is arranged in the rotating cover 8. A plug-in sleeve 28 is arranged on the fixed cover 17. The outer diameter of the plug-in sleeve 28 is smaller than the inner diameter of the entry sleeve 10. The plug-in sleeve 28 is arranged in the entry sleeve 10. The push rod 5 is plugged into the inner hole of the plug-in sleeve 28. The rotating cover 8 can be optionally rotatably connected to the fixed cover. Specifically, a rotatable connection can be achieved through a bearing. A clearance opening is provided on the fixed cover 17 to expose part of the gear ring 12 that meshes with the driving component 7.

[0028] The card plate 18 can be installed in the fixed cover 17 in a vertically movable manner, which can be specifically achieved by setting structures such as slide rails. A countersunk hole 29 for the push rod 5 to enter is provided on the card plate 18, and a limiting protrusion 30 is formed in the countersunk hole 29, and the limiting protrusion 30 is plugged into the limiting groove 15; a guide bevel 1 21 is provided on the front side of the limiting protrusion 30, and a guide bevel 2 22 is provided on the rear end of the limiting boss 16, and the guide bevel 1 21 is slidably matched with the guide bevel 2 22, and the rear end face of the limiting protrusion 30 is a clamping surface 23 that gradually tilts from the center of the countersunk hole 29 to the front side of the main body shell 1, and when the limiting protrusion 30 is plugged into the limiting groove 15, the front end face of the limiting boss 16 contacts the clamping surface 23.

[0029] As another improvement method, during the design, the axial depth dimension inside the extension cover 11 can be made larger than the sum of the moving stroke dimension of the push rod 5, the axial dimension of the driving component 7, and the thickness dimension of the fixed cover 17, thereby also preventing the push rod 5 from interfering with the driving component 7. However, this requires the main shell 1 to have a longer length, which is generally not a preferred method.

[0030] A mounting hole 24 is provided on the bottom side of the card plate 18, one end of the spring 19 is arranged in the mounting hole 24, and the other end is against the inner wall of the fixed cover 17. The spring 19, the limiting protrusion 30 and the push rod 5 are arranged in sequence in a vertical direction from bottom to top; the spring 19 is used to rebound and push the card plate 18 so that the limiting protrusion 30 is inserted into the limiting groove 15. When the limiting protrusion 30 is not in the limiting groove 15, the spring 19 is compressed.

[0031] The connecting rod assembly 20 is used to drive the card plate 18 to move vertically. The connecting rod assembly 20 includes a U-shaped member 25, a lever 26 and a trigger 27. The trigger 27 and the lever 26 are both rotatably connected to the main shell 1. The U-shaped member 25 is installed in the main shell 1 so as to be vertically movable. The inner side of one end of the U-shaped member 25 overlaps the top of the card plate 18, and the U-shaped member 25 can drive the card plate 18 to move downward. One end of the lever 26 overlaps the inner side of the other end of the U-shaped member 25, and the other end of the lever 26 overlaps the trigger 27. The trigger 27 can drive the U-shaped member 25 to move downward through the lever 26; the U-shaped member 25 is provided with a through hole or a notch for the output shaft of the motor 6 (or the driving component 7) to pass through, so that the U-shaped member does not interfere with the output shaft of the motor 6 or the driving component 7 when it moves vertically.

[0032] Instructions for use: First, put the sleeve of the locking structure 2 on the bolt plum head, the bolt plum head pushes the push rod 5 to move toward the rear side of the main shell 1, the guide inclined surface 22 of the limiting convex column 16 and the guide inclined surface 1 21 on the front side of the limiting protrusion 30 slide and cooperate to make the card plate 18 move downward, the push rod 5 enters the countersunk hole 29, and the spring 2 19 is compressed at the same time, the push rod 5 continues to move backward, after the limiting protrusion 30 is aligned with the limiting groove 15, the spring 2 19 rebounds and pushes the card plate 18 to move upward, the limiting protrusion 30 is stuck in the limiting groove 15, the front end face of the limiting convex column 16 contacts the clamping surface 23 on the card plate 18, and the push rod 5 is limited. The position is fixed; then the motor 6 is controlled to drive the driving component 7 to rotate, and the driving component 7 drives the rotating cover 8 to rotate through the ring gear 12, and the rotating cover 8 drives the locking structure 2 to rotate through the transmission mechanism 9 to tighten and cut the bolt plum head; then the trigger 27 is pulled, and the trigger 27 drives the U-shaped part 25 downward through the lever 26, and the U-shaped part 25 drives the clamping plate 18 downward, so that the spring 2 19 is compressed, and the limiting protrusion 30 is disengaged from the limiting groove 15, the rear end of the push rod 5 is released from the restriction, and the push rod 5 is rebounded and moved forward by the spring 13, thereby pushing out the bolt plum head in the locking structure 2, and when it is used again, the above process can be repeated.

[0033] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. An electric torsion shear wrench, characterized in that: It comprises a main body shell (1), a locking structure (2) installed at the front of the main body shell (1), a broken block discharge structure (3) and a driving structure (4) installed inside the main body shell (1); the broken block discharge structure (3) comprises a top rod (5) arranged in the main body shell (1) and movable forward and backward; The driving structure (4) comprises a motor (6), a driving component (7), a rotating cover (8) and a transmission mechanism (9); the rotating cover (8) is rotatably mounted in the main housing (1); the motor (6) is mounted on the rear side of the main housing (1); the output shaft of the motor (6) is arranged in the rotating cover (8), on which a driving component (7) for driving the rotating cover (8) to rotate is fixed; the rotating cover (8) drives the locking structure (2) to rotate through the transmission mechanism (9); the distance from the axis of the push rod (5) to the axis of the output shaft of the motor (6) is greater than the radius of the push rod (5) plus the radius of the driving component (7).

2. An electric torsion shear wrench according to claim 1, characterized in that: The driving component (7) is a gear, and a gear ring (12) is provided on the inner side surface of the rotating cover (8), and the gear is meshed with the gear ring (12).

3. An electric torsion shear wrench according to claim 2, characterized in that: The rotating cover (8) comprises an entry sleeve (10) and an expansion cover (11), wherein the entry sleeve (10) and the expansion cover (11) are integrally formed, and starting from the entry sleeve (10), the expansion cover (11) is in a shape that expands outwards.

4. An electric torsion shear wrench according to claim 3, characterized in that: The block discharge structure (3) further comprises a spring (13) and a limiting mechanism (14); the spring (13) is sleeved on the push rod (5); when the push rod (5) moves toward the rear side of the main shell (1), the spring (13) is compressed; a circle of limiting grooves (15) are provided at the rear of the push rod (5); a limiting convex column (16) is formed at the rear end of the push rod (5); the limiting mechanism (14) is installed in the main shell (1); when the push rod (5) moves to the rear side of the main shell (1), the limiting mechanism (14) fixes it via the limiting groove (15).

5. The electric torsion shear wrench according to claim 4, characterized in that: The limiting mechanism (14) comprises a fixed cover (17), a clamping plate (18), a second spring (19) and a connecting rod assembly (20); the fixed cover (17) is fixedly connected to the main housing (1); a plug-in sleeve (28) is provided on the fixed cover (17); the push rod (5) is plugged into the inner hole of the plug-in sleeve (28); the clamping plate (18) is vertically movably installed in the fixed cover (17); a countersunk hole (29) for the push rod (5) to enter is provided on the clamping plate (18); A limiting protrusion (30) is formed in the countersunk hole (29), and the limiting protrusion (30) is plugged into the limiting groove (15). A mounting hole (24) is provided on the bottom side of the clamping plate (18). One end of the second spring (19) is arranged in the mounting hole (24), and the other end is against the inner wall of the fixed cover (17). The second spring (19), the limiting protrusion (30) and the push rod (5) are arranged in sequence from bottom to top in a vertical direction, and the connecting rod assembly (20) is used to drive the clamping plate (18) to move vertically.

6. The electric torsion shear wrench according to claim 5, characterized in that: The fixed cover (17) is arranged in the rotating cover (8), the outer diameter of the plug-in sleeve (28) is smaller than the inner diameter of the entry sleeve (10), the plug-in sleeve (28) is arranged in the entry sleeve (10), and the rotating cover (8) can be optionally rotatably connected to the fixed cover (17).

7. An electric torsion shear wrench according to claim 6, characterized in that: The fixed cover (17) is provided with a clearance opening for exposing a portion of the gear ring (12) meshing with the driving component (7).

8. The electric torsion shear wrench according to claim 5, characterized in that: The connecting rod assembly (20) comprises a U-shaped member (25), a lever (26) and a trigger (27); the trigger (27) and the lever (26) are both rotatably connected to the main housing (1); the U-shaped member (25) is installed in the main housing (1) so as to be vertically movable; the inner side of one end of the U-shaped member (25) is overlapped with the top of the clamping plate (18); one end of the lever (26) is overlapped with the inner side of the other end of the U-shaped member (25); and the other end of the lever (26) is overlapped with the trigger (27).

9. The electric torsion shear wrench according to claim 5, characterized in that: A first guiding slope (21) is arranged at the front side of the limiting protrusion (30), and a second guiding slope (22) is arranged at the rear end of the limiting convex column (16), and the first guiding slope (21) and the second guiding slope (22) are slidably matched.

10. The electric torsion shear wrench according to claim 5, characterized in that: The rear end face of the limiting protrusion (30) is a snap-fit ​​surface (23) which gradually tilts outward from the center of the countersunk hole (29) toward the front side of the main housing (1); when the limiting protrusion (30) is in contact with the limiting groove (15), the front end face of the limiting convex column (16) contacts the snap-fit ​​surface (23).

Images