Electric tool

Abstract

The invention discloses an electric tool which comprises a shell, a transmission belt, a driving unit and a transmission wheel, the driving unit and the transmission wheel are arranged in the shell, and the transmission wheel is arranged at the output end of the driving unit. One end, in the length direction, of the transmission belt sleeves the transmission wheel, and the other end of the transmission belt extends towards the outside of the shell; power generated by the driving unit is transmitted to the transmission belt through the transmission wheel so as to drive the transmission belt to rotate. According to the electric tool, the technical problem that in the prior art, a bolt or a nut is difficult to screw or unscrew in a narrow environment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of hardware tools, and in particular relates to an electric tool. Background Art

[0002] At present, electric tools are generally used to tighten or loosen bolts and nuts. Commonly used electric tools include electric wrenches, electric screwdrivers, etc., which are generally divided into straight rod type, handheld type and installation type. Electric wrenches can be used to load and unload threaded connectors, and can also be used as final tightening tools for high-strength bolts, that is, to tighten the initially tightened bolts to the specified torque. This type of electric wrench is widely used in assembly work in manufacturing industries such as automobiles, tractors, motors and electrical appliances, power machinery, valves, water pumps, and textile machinery. It can also be used in chemical, cement prefabricated parts, plastic molding and other operations, such as the assembly and disassembly of vacuum tanks, reactors, and cement templates, and the demoulding of threaded plastic parts in the production process. It can also be used in railways, bridges, buildings and other projects, such as the installation, maintenance and replacement of structures such as cement sleepers, truss nodes, and angle steel scaffolding. The electric screwdriver is composed of three major parts: electronics, motors, and mechanics. The electric screwdriver is equipped with a mechanism for adjusting and limiting torque and is mainly used in assembly lines. Due to its high precision and high efficiency, the electric screwdriver has become an indispensable tool in the assembly industry. When there are other workpieces or devices around the bolts or nuts, such as the bolts or nuts of wind turbines, the narrow environment limits the application of many power tools. In addition, when tightening or loosening the nut, the general power tool is to nest the nut in the sleeve, and it is difficult to tighten or loosen the nut using the sleeve when the bolt rod is long. Summary of the invention

[0003] In view of the current technical problems, the present invention aims to provide an electric tool, which can solve the technical problem in the prior art that it is difficult to tighten or loosen bolts or nuts in a narrow environment.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An electric tool, whose structural characteristics are: it includes a shell, a transmission belt, a drive unit and a transmission wheel arranged in the shell, the transmission wheel is arranged on the output end of the drive unit; one end of the transmission belt along the length direction is sleeved on the transmission wheel, and the other end extends to the outside of the shell; the power generated by the drive unit is transmitted to the transmission belt through the transmission wheel, thereby driving the transmission belt to rotate.

[0006] When the electric tool of the present application is used, the end of the transmission belt extending out of the housing is sleeved on the side wall of the bolt or nut, and the housing is pulled to the side away from the bolt or nut, so that the transmission belt is in a tensioned state to provide friction between the transmission belt and the bolt or nut. The drive unit is started, the drive unit drives the transmission wheel to rotate, the transmission wheel drives the transmission belt to rotate, and the transmission belt bolt or nut rotates, thereby achieving the tightening and loosening of the bolt or nut. When the electric tool of the present application is used for operation, it is only necessary to sleeve the transmission belt on the bolt or nut and operate on the side of the bolt or nut. It is not limited by narrow environments and the length of the bolt rod, and the operation is simple and the accessories are streamlined.

[0007] Preferably, the housing comprises a handheld part, a receiving slot at the top of the handheld part, and a cover plate detachably connected to the top of the receiving slot, wherein one end of the receiving slot along the length direction is an open structure; a receiving cavity is provided in the handheld part, a drive unit is provided in the receiving cavity, and an output end of the drive unit extends into the receiving slot; the transmission belt and the transmission wheel are provided in the receiving slot, and an outer end of the transmission belt extends toward the open end of the receiving slot. The handheld part is provided so that when the electric tool is used, it is convenient to operate the housing to be pulled toward a side away from the bolt or nut.

[0008] Specifically, the hand-held part is arranged at one end of the accommodating groove along the length direction, and the outer end of the transmission belt and the hand-held part are arranged at two ends of the accommodating groove respectively.

[0009] Preferably, a first support assembly and at least two second support assemblies are provided in the receiving groove, the second support assemblies are provided on both sides along the width direction of the receiving groove, and the first support assembly is provided between the second support assembly and the transmission wheel; the outer surfaces of the first support assembly and the second support assembly are both cylindrical structures, the first support assembly is provided on the inner side of the transmission belt, and the second support assemblies are provided on the outer side of the transmission belt. The first support assembly and the second support assembly are provided to limit the position of the transmission belt, thereby improving the operability of the power tool. When tightening and loosening larger-sized bolts or nuts, the second support assembly can prevent the expansion of the transmission belt from rubbing against the open end of the receiving groove. When tightening and loosening smaller-sized bolts or nuts, the first support assembly can prevent the axis from being unstable due to the elongation of the transmission belt.

[0010] Preferably, the first support assembly includes a first support column and a first sleeve sleeved outside the first support column, the first sleeve is rotatably connected to the first support column; the second support assembly includes a second support column and a second sleeve sleeved outside the second support column, the second sleeve is rotatably connected to the second support column, and the bottoms of the first support column and the second support column are fixedly connected to the receiving groove. The first sleeve and the second sleeve can rotate, which can reduce the contact friction between the first sleeve and the second sleeve and the transmission belt.

[0011] Preferably, the top of the first support column is provided with an inward groove, and the inner side wall of the groove is provided with a first clamping part; the cover plate is provided with a first connecting piece at a position corresponding to the position of the first support column, and the two ends of the first connecting piece are respectively provided with a second clamping part located below the cover plate and an adjustment part located above the cover plate, and the second clamping part is clamped with the first clamping part; the height of the second support column is not less than the height of the first support column, and the second support column abuts against the cover plate; a third clamping part is provided on the inner side wall of the end of the receiving groove, and a fixing groove corresponding to the third clamping part is provided on the side wall of the end of the cover plate, and the fixing groove is clamped with the third clamping part; preferably, a portable buckle is provided on the outer side wall of the end of the receiving groove. A second support column is provided to support the cover plate, and the cover plate is connected to the receiving groove through the second clamping part, which can limit the vertical displacement of the transmission belt. An adjustment part is provided to facilitate the operation of the position of the second clamping part.

[0012] Preferably, two second support assemblies are provided, and the two second support assemblies are symmetrically arranged at the open end of the accommodating groove, and the transmission wheel and the second support assembly are respectively arranged at the two ends of the accommodating groove along the length direction; the distance between the first support assembly and the open end of the accommodating groove is L1, the length of the accommodating groove is L, and L / 4≤L1≤L / 3.

[0013] Preferably, the axial center line of the first support assembly, the symmetry axes of the two second support assemblies and the axial center line of the transmission wheel are located on the same plane.

[0014] Preferably, the driving unit includes a power supply and a motor, and the output end of the motor is connected to the transmission wheel; the housing is provided with a start switch and an adjustment switch for controlling the motor, and the start switch, the adjustment switch, the power supply and the motor are electrically connected; preferably, the power supply is a battery. The start switch is set to connect the circuit, and the adjustment switch is set to set the forward and reverse rotation mode of the motor. By setting the forward and reverse rotation of the motor, the bolts or nuts can be tightened and loosened. The power supply mode of the independent battery is adopted, which is convenient to carry.

[0015] Preferably, the transmission wheel is a gear.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the electric tool of the present invention is easy to carry, simple to operate, has simple accessories, and can tighten or loosen bolts or nuts in a narrow environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of the electric tool of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle hand-held part and the receiving slot;

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle cover in the open and fixed states;

[0020] Figure 4 yes Figure 1 Electrical connection diagram of the motor, regulating switch, starting switch and power supply.

[0021] In the figure

[0022] 1-shell; 101-hand-held part; 102-accommodating groove; 103-cover plate; 104-accommodating chamber; 2-transmission belt; 3-drive unit; 301-power supply; 302-motor; 4-transmission wheel; 5-first support assembly; 501-first support column; 502-first sleeve; 503-groove; 504-first clamping part; 6-second support assembly; 601-second support column; 602-second sleeve; 7-first connecting piece; 701-second clamping part; 702-adjusting part; 8-third clamping part; 9-fixing groove; 10-start switch; 11-adjusting switch; 12-portable buckle; 13-connecting battery probe. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0024] like Figure 1 As shown, the present embodiment provides an electric tool, which includes a housing 1, a transmission belt 2, and a drive unit 3 and a transmission wheel 4 arranged in the housing 1. The transmission wheel 4 is a gear. The drive unit 3 includes a power supply 301 and a motor 302. The power supply 301 is a battery. The output end of the motor 302 is connected to the transmission wheel 4. A start switch 10 and an adjustment switch 11 for controlling the motor 302 are nested on the housing 1. The start switch 10, the adjustment switch 11, the power supply 301 and the motor 302 are electrically connected. Figure 1 , Figure 2 and Figure 3 As shown, the housing 1 includes a handheld portion 101, a receiving slot 102 located at the top of the handheld portion 101, and a cover plate 103 detachably connected to the top of the receiving slot 102. One end of the receiving slot 102 along the length direction is an open structure. A receiving chamber 104 is provided in the handheld portion 101, and a power supply 301 and a motor 302 are arranged in the receiving chamber 104. Two battery connection probes 13 are provided in the receiving chamber 104. The two battery connection probes 13 correspond to the two battery electrodes of the power supply 301 to achieve the connection of the power supply 301. Figure 4As shown, one of the battery electrodes 801 of the power supply 301 is connected to one terminal of the start switch 10 through the corresponding connection battery probe 13, the other terminal of the start switch 10 is connected to the adjustment switch 11, the other battery electrode 801 of the power supply 301 is connected to the adjustment switch 11 through the corresponding connection battery probe 13, and the two terminals of the motor 302 are connected to the adjustment switch. By toggling the adjustment switch 11, the mode of connecting the positive and negative terminals of the power supply 301 to the motor 302 is selected, and then the forward and reverse rotation mode of the motor 302 is selected, and the start switch 10 is pressed to connect the circuit and realize the rotation of the motor 302.

[0025] like Figure 2 As shown, the output end of the motor 302 extends upward into the receiving groove 102 and is connected to the transmission wheel 4. One end of the transmission belt 2 along the length direction is sleeved on the transmission wheel 4, and the other end extends to the outside of the open end of the receiving groove 102. The outer end of the transmission belt 2 and the hand-held part 101 are respectively arranged at the two ends of the receiving groove 102. A first support assembly 5 and two second support assemblies 6 are arranged in the receiving groove 102. The two second support assemblies 6 are symmetrically arranged on both sides of the open end of the receiving groove 102 along the width direction. The first support assembly 5 is arranged between the second support assembly 6 and the transmission wheel 4, and the axial center line of the first support assembly 5, the symmetry axis of the two second support assemblies 6 and the axial center line of the transmission wheel 2 are located on the same plane. The distance between the first support assembly 5 and the open end of the receiving groove 102 is L1, and the length of the receiving groove 102 is L, L1 = L / 3. The first support assembly 5 is arranged on the inner side of the transmission belt 2, and the two second support assemblies 6 are arranged on the outer side of the transmission belt 2. The first support assembly 5 includes a first support column 501 and a first sleeve 502 sleeved outside the first support column 501, and the first sleeve 502 is rotatably connected to the first support column 501. The second support assembly 6 includes a second support column 601 and a second sleeve 602 sleeved outside the second support column 601, and the second sleeve 602 is rotatably connected to the second support column 601. The bottoms of the first support column 501 and the second support column 601 are fixedly connected to the receiving groove 102. An inward groove 503 is provided on the top of the first support column 501, and a first clamping portion 504 is provided on the inner side wall of the groove 503. Figure 3As shown, a first connecting member 7 is provided on the cover plate 103 at a position corresponding to the first supporting column 501, and a second clamping portion 701 located below the cover plate 103 and an adjusting portion 702 located above the cover plate 103 are provided at both ends of the first connecting member 7, respectively, and the second clamping portion 701 is clamped with the first clamping portion 504. By rotating the adjusting portion 702 by 90°, the second clamping portion 701 and the first clamping portion 504 can be installed and removed. The height of the second supporting column 601 is greater than the height of the first supporting column 501, and the second supporting column 601 abuts against the cover plate 103. A third clamping portion 8 is provided on the inner side wall of the end of the receiving groove 102, and a fixing groove 9 corresponding to the third clamping portion 8 is provided on the side wall of the end of the cover plate 103, and the fixing groove 9 is clamped with the third clamping portion 8. A portable buckle 12 is provided on the outer side wall of the end of the receiving groove 102, and the portable buckle 12 is integrally connected with the third clamping portion 8.

[0026] When the electric tool is used, the outer end of the transmission belt 2 is sleeved on the bolt or nut, and the forward and reverse rotation of the motor 302 is set by adjusting the switch 11. The user holds the hand grip 101 with both hands and pulls it backward to provide friction between the transmission belt 2 and the bolt or nut, presses the start switch 10, and the motor 302 drives the transmission wheel 4 to rotate, the transmission wheel 4) drives the transmission belt 2 to rotate, and the transmission belt 2 drives the bolt or nut to rotate, so as to tighten and loosen the bolt or nut. The inner side of the transmission belt 2 can contact the outer wall of the first sleeve 502, and the outer side of the transmission belt 2 can contact the outer wall of the second sleeve 602. The first sleeve 502 and the second sleeve 602 can rotate to reduce the contact friction with the transmission belt 2. The first sleeve 502 and the second sleeve 602 can play a role in limiting the position of the transmission belt 2. When tightening and loosening the bolts or nuts of larger sizes, the two second sleeves 602 can prevent the expansion of the transmission belt 2 from rubbing against the open end of the receiving groove 102. When tightening or loosening a bolt or nut of a smaller size, the first sleeve 502 can prevent the transmission belt 2 from being stretched and causing the axis to be unstable.

[0027] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the invention, and are not used to limit the scope of the invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. An electric tool, characterized in that: The invention comprises a housing (1), a transmission belt (2), a driving unit (3) and a transmission wheel (4) arranged in the housing (1); the transmission wheel (4) is arranged on the output end of the driving unit (3); one end of the transmission belt (2) along the length direction is sleeved on the transmission wheel (4), and the other end extends to the outside of the housing (1); the power generated by the driving unit (3) is transmitted to the transmission belt (2) through the transmission wheel (4), thereby driving the transmission belt (2) to rotate.

2. The electric tool according to claim 1, characterized in that: The housing (1) comprises a handheld portion (101), a receiving groove (102) located at the top of the handheld portion (101), and a cover plate (103) detachably connected to the top of the receiving groove (102); one end of the receiving groove (102) along the length direction is an open structure; a receiving cavity (104) is provided in the handheld portion (101); a drive unit (3) is arranged in the receiving cavity (104), and an output end of the drive unit (3) extends into the receiving groove (102); the transmission belt (2) and the transmission wheel (4) are arranged in the receiving groove (102), and an outer end of the transmission belt (2) extends toward the open end of the receiving groove (102).

3. The electric tool according to claim 2, characterized in that: The hand-held portion (101) is arranged at one end of the receiving groove (102) along the length direction, and the outer end of the transmission belt (2) and the hand-held portion (101) are respectively arranged at two ends of the receiving groove (102).

4. The electric tool according to claim 2, characterized in that: The receiving groove (102) is provided with A first support assembly (5) and at least two second support assemblies (6), wherein the second support assemblies (6) are arranged on both sides of the receiving groove (102) in the width direction, and the first support assembly (5) is arranged between the second support assembly (6) and the transmission wheel (4); the outer surfaces of the first support assembly (5) and the second support assembly (6) are both cylindrical structures, the first support assembly (5) is arranged on the inner side of the transmission belt (2), and the second support assemblies (6) are arranged on the outer side of the transmission belt (2).

5. The electric tool according to claim 4, characterized in that: The first support assembly (5) comprises a first support column (501) and a first sleeve (502) sleeved outside the first support column (501). The first sleeve (502) is rotatably connected to the first support column (501); the second support assembly (6) comprises a second support column (601) and a second sleeve (602) sleeved outside the second support column (601). The second sleeve (602) is rotatably connected to the second support column (601), and the bottoms of the first support column (501) and the second support column (601) are fixedly connected to the receiving groove (102).

6. The electric tool according to claim 5, characterized in that: The top of the first support column (501) is provided with an inward groove (503), and the inner wall of the groove (503) is provided with a first clamping portion (504); the cover plate (103) is provided with a first connecting member (7) at a position corresponding to the position of the first support column (501), and the two ends of the first connecting member (7) are respectively provided with a second clamping portion (701) located below the cover plate (103) and an adjusting portion (702) located above the cover plate (103), and the second clamping portion (701) and the first clamping portion (504) are connected to each other. 4) are snap-connected; the height of the second support column (601) is not less than the height of the first support column (501), and the second support column (601) is in contact with the cover plate (103); a third snap-connecting portion (8) is provided on the inner side wall of the end of the accommodating groove (102), and a fixing groove (9) corresponding to the third snap-connecting portion (8) is provided on the side wall of the end of the cover plate (103), and the fixing groove (9) is snap-connected with the third snap-connecting portion (8); preferably, a portable buckle (12) is provided on the outer side wall of the end of the accommodating groove (102).

7. The electric tool according to claim 5, characterized in that: Two second support assemblies (6) are provided, and the two second support assemblies (6) are symmetrically arranged at the open end of the receiving groove (102), and the transmission wheel (4) and the second support assembly (6) are respectively arranged at the two ends of the receiving groove (102) along the length direction; the distance between the first support assembly (5) and the open end of the receiving groove (102) is L1, and the length of the receiving groove (102) is L, and L / 4≤L1≤L / 3.

8. The electric tool according to claim 7, characterized in that: The axial center line of the first support assembly (5), the symmetry axes of the two second support assemblies (6) and the axial center line of the transmission wheel (2) are located on the same plane.

9. The electric tool according to any one of claims 1 to 8, characterized in that: The driving unit (3) comprises a power supply (301) and a motor (302), wherein the output end of the motor (302) is connected to the transmission wheel (4); a starting switch (10) and an adjusting switch (11) for controlling the motor (302) are provided on the housing (1); the starting switch (10), the adjusting switch (11), the power supply (301) and the motor (302) are electrically connected; preferably, the power supply (301) is a battery.

10. The electric tool according to any one of claims 1 to 8, characterized in that: The transmission wheel (4) is a gear.

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