CN112959255A

CN112959255A - Electric wrench

Info

Publication number: CN112959255A
Application number: CN202110201905.5A
Authority: CN
Inventors: 王田田; 刘燕龙
Original assignee: Individual
Current assignee: Shandong Jiuxin Machinery Tool Co ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-06-15
Anticipated expiration: 2041-02-23
Also published as: CN112959255B

Abstract

An electric wrench, comprising: the device comprises a shell part, a switching part, a power part, a transmission part and a working part; the switching part to the working part are all arranged inside the shell part; the shell part is a hollow structure, the number of the transmission parts is two, and the transmission parts are arranged at the upper end of the power part; the switching part is arranged at the upper end of the transmission part; one end of each transmission part is provided with a working part; the power part is used as an integral power source and control and can control the opening, closing and screwing of the wrench; the transmission part is used for power transmission of the working part and plays a role in power transmission; the switching part can switch the mode of the power transmitted from the transmission part to the working part and can control the forward screwing and the backward screwing of the working part; the working part has the function of manually adjusting the size, so that the wrench can adapt to screws with different sizes; the whole machine has the advantages of labor saving and high working efficiency.

Description

Electric wrench

Technical Field

The invention relates to the field of electric tools, in particular to an electric wrench.

Background

The electric wrench is an electric tool for screwing and unscrewing the bolt and the nut, and is a tool for screwing the high-strength bolt. The device is used for initial screwing and final screwing of large-hexagon-head high-strength bolts for construction of steel structure bridges, factory buildings, chemical engineering and power generation equipment, and initial screwing of torsional shear type high-strength bolts, and occasions with strict requirements on torque or axial force of bolt fasteners; the electric wrenches have different product names and models and different application and use ranges, but most of the electric wrenches need to be convenient and quick tools, so that a wrench capable of automatically clamping and loosening screws is needed.

Disclosure of Invention

Aiming at the problem of complaint, the invention provides an electric wrench, which aims to solve the problems of low working efficiency, low mechanical utilization rate and high manufacturing cost of the existing electric wrench.

The technical scheme adopted by the invention is as follows: an electric wrench, comprising: the device comprises a shell part, a switching part, a power part, a transmission part and a working part; the switching part to the working part are all arranged inside the shell part; the shell part is a hollow structure and comprises a shell a and a handle; the grip is fixedly connected with the shell a; the number of the transmission parts is two, and the transmission parts are arranged at the upper end of the power part; the switching part is arranged at the upper end of the transmission part; one end of each transmission part is provided with a working part; the power part is used as an integral power source and control and can control the opening, closing and screwing of the wrench; the transmission part is used for power transmission of the working part and plays a role in power transmission; the switching part can switch the mode of the power transmitted from the transmission part to the working part and can control the forward screwing and the backward screwing of the working part; the working part has the function of manually adjusting the size, so that the wrench can adapt to screws with different sizes.

Further, the switching part includes: the device comprises a base, a slide rail, a clamping rod, a slide block, a button, a connecting rod a, a spring a and a spring b; the upper end of the sliding rail is slidably arranged in the middle of the base; a bulge in the middle of the clamping rod is slidably arranged in a groove at the upper end of the sliding rail; two sides of the sliding block are slidably arranged at two ends of the base; the button is fixedly arranged at one end of the sliding block; a round hole at one end of the connecting rod a is rotatably arranged on a cylinder on the base, and a groove arranged at the other end of the connecting rod a is in sliding connection with the cylinder on the sliding block; one end of the spring a is fixedly connected with the base, and the other end of the spring a is fixedly connected with the cylinder on the connecting rod a; the two springs b are arranged on the two sides of the bulge of the clamping rod, and the other ends of the springs b are fixedly connected with the inner wall of the groove of the sliding rail.

Further, the power part comprises: the device comprises a power mechanism, a switching mechanism and an output mechanism; the switching mechanism is arranged at the upper end of the power mechanism; the output mechanism is arranged at the upper end of the switching mechanism; the power mechanism is an integral power source, and the switching mechanism can control the opening, closing and screwing of the integral wrench; the output mechanism outputs the power transmitted by the power mechanism through the switching mechanism.

Further, the power mechanism comprises: the device comprises a motor, a synchronous wheel a, a synchronous belt a, a rotating shaft a and a synchronous wheel d; the motor is fixedly arranged in the grip; the switch is fixedly arranged on the outer wall of the grip and is connected with the motor through a lead; the synchronizing wheel a is fixedly arranged on a motor shaft of the motor; the rotating shaft a is rotatably arranged in the handle, the lower end of the rotating shaft a is provided with a synchronizing wheel d which is fixedly connected, and the synchronizing wheel d is connected with the synchronizing wheel a through a synchronizing belt a.

Further, the switching mechanism includes: the device comprises a rack a, a top block, a rotating shaft b, a spring c, a cam, a knob a, a straight gear a, a wedge block, a limiting block a and a bearing; the bearing is rotatably arranged in the grip, the lower end of the bearing is in sliding connection with the rotating shaft a, and the upper end of the bearing is provided with a clamping block; the cam is rotatably arranged in the handle, and the knob a is fixedly arranged at the outer end of the cam; the rotating shaft b is rotatably arranged in the handle, a clamping block of the rotating shaft b is matched with the groove on the cam, a spring c is arranged at the outer end of the rotating shaft b, and the left end of the spring c is fixedly connected with one end of the cam; the top block is rotatably arranged at the right end of the rotating shaft b; one side of the top block is provided with two racks a; the straight gear a is rotatably arranged inside the handle; the rack a is meshed with the straight gear a; the number of the wedge blocks is two, one end of each wedge block is provided with a rack a, and the rack a is slidably arranged in the handle; the limiting block a is rotatably arranged on the bulge in the middle of the bearing, and the two ends of the limiting block a are provided with clamping blocks which are matched with the wedge blocks.

Further, the output mechanism comprises: a synchronous belt b, a synchronous wheel b, an eccentric wheel a, a notch, an eccentric wheel b and a synchronous wheel c; the eccentric wheel a is rotatably arranged in the shell a, and a clamping block arranged on the eccentric wheel a is in sliding connection with a sliding groove of the sliding rail; the lower end of the eccentric wheel a is provided with a notch which is matched with the upper end of the bearing; the eccentric wheel b is rotatably arranged in the shell a, and the lower end of the eccentric wheel b is provided with a fixedly connected synchronizing wheel c; the synchronizing wheel b is rotatably arranged in the shell a, a groove is formed in the center of the synchronizing wheel b, and the groove is matched with the upper end of the bearing; the synchronous wheel b is connected with the synchronous wheel c through a synchronous belt b.

Further, the transmission part comprises: the opening and closing mechanism and the screwing mechanism; the opening and closing mechanism is arranged in the shell a; the screwing mechanism is arranged on the upper part of the opening and closing mechanism; the opening and closing mechanism controls the opening and closing of the two working parts through the force output by the power part so as to clamp a screw; the screwing mechanism only has one work, and the screwing mechanism is used for screwing and unscrewing the screw by forward screwing and backward screwing respectively.

Further, the mechanism that opens and shuts include: the device comprises a bracket, a sliding chute, a rack b, a connecting rod c and a connecting rod d; the bracket is fixedly arranged in the shell a; one side of the sliding chute is fixedly provided with a rack b, and the rack b is arranged in the shell a in a sliding manner; the groove at the lower end of the sliding chute is in sliding connection with the bulge of the eccentric wheel b; a cylinder at one end of the connecting rod b is rotatably arranged in an outer round hole on the bracket; a cylinder at one end of the connecting rod c is rotatably arranged in an inner round hole on the bracket; the teeth arranged on the connecting rod c are meshed with the rack b; the cylinder on the connecting rod d is rotatably arranged in the round holes on the other sides of the connecting rod b and the connecting rod c.

Further, the screwing mechanism comprises: the device comprises a straight gear b, a synchronous wheel e, a synchronous belt c, a support, a bevel gear a, a synchronous wheel f, a bevel gear b, a telescopic rod, a ratchet wheel, a pawl, a synchronous wheel g, a positioning block, a rack c and a synchronous belt d; the rack c is slidably arranged in a groove on the bracket, a positioning block fixedly arranged is arranged on the rack c, a round hole is arranged on the positioning block, and the round hole is matched with the cylinders on the two sides of the clamping rod; a straight gear b is rotatably arranged on a round hole on the connecting rod c, and a synchronous gear e fixedly arranged is arranged on the straight gear b; the round holes on the two ends of the connecting rod b are internally and rotatably provided with a support; a synchronizing wheel f is rotatably arranged on the support, and a bevel gear a is arranged on the synchronizing wheel f; the lower synchronous wheel f is connected with a synchronous wheel e through a synchronous belt c; two ends of the telescopic rod are rotatably arranged in round holes on the support, and two ends of the telescopic rod are provided with bevel gears b which are meshed with the bevel gears a; the ratchet wheel is rotatably arranged on the inner round hole of the connecting rod d, the pawl is matched with the ratchet wheel for use, a synchronizing wheel g is arranged on the pawl, and the synchronizing wheel g is connected with a synchronizing wheel f on the upper side of the connecting rod b through the synchronizing belt d.

Further, the working part comprises: the device comprises a shell b, a straight gear c, a limiting block b, a shell c, a shell d, a knob b, a limiting plate and a fixing piece; the shell b is fixedly arranged on the inner side of the connecting rod d and is of a hollow structure; the straight gear c is rotatably arranged in a chute in the shell b; the straight gear c is meshed with the ratchet wheel; the limiting block b is slidably arranged in a chute in the straight gear c; the limiting block b is provided with an electromagnetic buckle, and an electromagnetic opening can be clamped with a circular hole in the straight gear c; the shell c and the shell d are of hollow structures, and are fixedly arranged at one end of the limiting block b; the knob b is slidably arranged in a chute on the shell d; the two limiting plates are fixedly connected with each other, one limiting plate is fixedly connected with the knob b, and an arc-shaped sliding groove is formed in each limiting plate; the stationary blade has three, and the stationary blade slidable mounting is in the hole that casing c and casing d are constituteed, and protruding slidable mounting on the stationary blade tail end is in the arc spout on the limiting plate.

Due to the adoption of the technical scheme, the invention has the following advantages:

(1) a switching part: when the button is pulled manually, the wrench is controlled to be tightened or loosened; the automatic switching function of screwing and loosening of the wrench is realized, the working efficiency is greatly improved, the waste of power is reduced, and the manufacturing cost is reduced.

(2) A power mechanism: when the switch is pressed, the switch controls the motor to work and drives the rotating shaft a to rotate; the whole power source only needs one, so that the manufacturing cost is greatly reduced, and the resource waste is reduced.

(3) An output mechanism: when the bearing is matched with the synchronous wheel b, the synchronous wheel c drives the eccentric wheel b to rotate; when the bearing is matched with the notch, the notch drives the eccentric wheel a to rotate; the power output function is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

(4) The opening and closing mechanism comprises: when the eccentric wheel b rotates, the connecting rod d drives the working part to move; the automatic opening and closing function is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

(5) Screwing the mechanism: when the positioning block moves back and forth, the pawl drives the ratchet wheel to rotate, and when the pawl rotates reversely, the pawl does not drive the ratchet wheel to rotate; the automatic screw tightening and loosening device has the advantages that the automatic screw tightening and loosening functions can be realized when the screw is clamped by the wrench, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

(6) The working part is as follows: the knob b is rotated manually, the knob b drives the two limiting plates to rotate, the groove in the limiting plate drives the protrusion on the rear end of the fixing plate to move, and then the fixing plate is driven to move, so that the size adjusting function is achieved.

(7) When the two working parts clamp the screws, the straight gear c starts to rotate, and the function of unscrewing the screws is achieved.

(8) When the two working parts are screwed, the straight gear c is positioned at the middle position, so that the two working parts cannot be loosened, the limiting block b is loosened from the straight gear c, and the straight gear c is controlled to reset; the function of automatically adjusting the size and tightening the screws is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

Drawings

FIG. 1 is an overall schematic view of the present invention.

Fig. 2 and 3 are schematic internal views of the present invention.

Fig. 4 is a schematic diagram of a switching portion according to the present invention.

Fig. 5 is an exploded view of the switching section of the present invention.

FIG. 6 is a schematic diagram of the power section of the present invention.

Fig. 7 and 8 are schematic diagrams of the power part of the invention in an exploded manner.

Fig. 9 and 10 are schematic views of the transmission part of the invention.

Fig. 11 and 12 are exploded views of the transmission part of the present invention.

FIG. 13 is a schematic cross-sectional view of a working portion of the present invention.

Fig. 14 is an exploded view of the working part of the present invention.

Fig. 15 is a schematic cross-sectional view of a working part of the present invention.

Reference numerals: 1-a shell part; 2-a switching part; 3-a power section; 4-a transmission part; 5-a working part; 101-a housing a; 102-a grip; 201-a base; 202-a slide rail; 203-clamping rod; 204-a slide block; 205-a button; 206-link a; 207-spring a; 208-spring b; 301-a motor; 302-a switch; 303-synchronizing wheel a; 304-synchronous belt a; 305-axis of rotation a; 306-rack a; 307-top block; 308-rotating shaft b; 309-spring c; 310-a cam; 311-knob a; 312-spur gear a; 313-wedge block; 314-a bearing; 315-synchronous belt b; 316-synchronizing wheel b; 317-eccentric wheel a; 318-notches; 319-eccentric b; 320-synchronizing wheel c; 321-a limiting block a; 322-synchronizing wheel d; 401-a scaffold; 402-a chute; 403-rack b; 404-spur gear b; 405-synchronizing wheel e; 406-synchronous belt c; 407-link b; 408-link c; 409-support; 410-bevel gear a; 411-synchronizing wheel f; 412-bevel gear b; 413-a telescopic rod; 414-ratchet wheel; 415-a pawl; 416-synchronizing wheel g; 417-a locating block; 418-rack c; 419-synchronous belt d; 420-connecting rod d; 501-shell b; 502-spur gear c; 503-a stopper b; 504-shell c; 505-housing d; 506-knob b; 507-a limiting plate; 508-fixing plate.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in many ways other than those described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit of the invention, and therefore the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In one embodiment, as shown in fig. 1-15, an electric wrench comprises: a housing part 1, a switching part 2, a power part 3, a transmission part 4 and a working part 5; the switching portion 2 to the working portion 5 are all installed inside the housing portion 1; the housing portion 1 is a hollow structure, and the housing portion 1 includes a case a101 and a grip 102; the grip 102 is fixedly connected with the shell a 101; the number of the transmission parts 4 is two, and the transmission parts 4 are arranged at the upper end of the power part 3; the switching part 2 is arranged at the upper end of the transmission part 4; one end of each transmission part 4 is provided with a working part 5; the power part 3 is used as an integral power source and control and can control the opening, closing and screwing of the wrench; the transmission part 4 is the power transmission of the working part 5 and plays a role in power transmission; the switching part 2 can switch the mode of the power transmitted by the transmission part 4 to the working part 5, and can control the forward screwing and the backward screwing of the working part 5; the working part 5 has the function of manually adjusting the size, so that the wrench can adapt to screws with different sizes.

In an alternative implementation of the embodiment of the present invention, the switching part 2 includes, in addition to the same components as in the previous embodiment: the base 201, the slide rail 202, the clamping rod 203, the sliding block 204, the button 205, the connecting rod a206, the spring a207 and the spring b 208; the upper end of the slide rail 202 is slidably mounted in the middle of the base 201; a bulge in the middle of the clamping rod 203 is slidably arranged in a groove at the upper end of the sliding rail 202; two sides of the sliding block 204 are slidably arranged at two ends of the base 201; the button 205 is fixedly arranged at one end of the sliding block 204; a round hole at one end of the connecting rod a206 is rotatably arranged on a cylinder on the base 201, and a groove arranged at the other end of the connecting rod a206 is in sliding connection with the cylinder on the sliding block 204; one end of the spring a207 is fixedly connected with the base 201, and the other end of the spring a207 is fixedly connected with a cylinder on the connecting rod a 206; two springs b208 are arranged on two sides of the protrusion of the clamping rod 203, and the other end of the spring b208 is fixedly connected with the inner wall of the groove of the sliding rail 202.

In an alternative implementation of the embodiment of the invention, the power section 3 comprises, apart from the same parts as the previous embodiment: the device comprises a power mechanism, a switching mechanism and an output mechanism; the switching mechanism is arranged at the upper end of the power mechanism; the output mechanism is arranged at the upper end of the switching mechanism; the power mechanism is an integral power source, and the switching mechanism can control the opening, closing and screwing of the integral wrench; the output mechanism outputs the power transmitted by the power mechanism through the switching mechanism.

In an alternative implementation of the embodiment of the invention, the power mechanism comprises, in addition to the same components as in the previous embodiment: the motor 301, the synchronous wheel a303, the synchronous belt a304, the rotating shaft a305 and the synchronous wheel d 322; the motor 301 is fixedly arranged inside the grip 102; the switch 302 is fixedly arranged on the outer wall of the handle 102 and is connected with the motor 301 through a lead; the synchronizing wheel a303 is fixedly arranged on a motor 301 shaft of the motor 301; the rotating shaft a305 is rotatably installed inside the grip 102, a synchronizing wheel d322 fixedly connected is arranged at the lower end of the rotating shaft a305, and the synchronizing wheel d322 is connected with the synchronizing wheel a303 through a synchronizing belt a 304.

In an alternative implementation of the embodiment of the present invention, the switching mechanism includes, in addition to the same components as in the previous embodiment: the device comprises a rack a306, a top block 307, a rotating shaft b308, a spring c309, a cam 310, a knob a311, a spur gear a312, a wedge block 313, a limiting block a321 and a bearing 314; the bearing 314 is rotatably installed inside the handle 102, the lower end of the bearing 314 is slidably connected with the rotating shaft a305, and the upper end of the bearing 314 is provided with a fixture block; the cam 310 is rotatably arranged inside the grip 102, and the knob a311 is fixedly arranged at the outer end of the cam 310; the rotating shaft b308 is rotatably arranged in the handle 102, a fixture block of the rotating shaft b308 is matched with a groove on the cam 310, the outer end of the rotating shaft b308 is provided with a spring c309, and the left end of the spring c309 is fixedly connected with one end of the cam 310; the top block 307 is rotatably arranged at the right end of the rotating shaft b 308; one side of the top block 307 is provided with two racks a 306; spur gear a312 is rotatably mounted inside the grip 102; rack a306 is meshed with spur gear a 312; the number of the wedge blocks 313 is two, one end of the wedge block 313 is provided with a rack a306, and the rack a306 is slidably arranged in the handle 102; the limiting block a321 is rotatably installed on a protrusion in the middle of the bearing 314, and two ends of the limiting block a321 are provided with clamping blocks which are matched with the matching blocks 313.

In an alternative implementation of this embodiment of the present invention, the output mechanism includes, in addition to the same components as in the previous embodiment: synchronous belt b315, synchronous wheel b316, eccentric wheel a317, notch 318, eccentric wheel b319 and synchronous wheel c 320; the eccentric wheel a317 is rotatably installed inside the housing a101, and a clamping block arranged on the eccentric wheel a317 is slidably connected with the sliding groove 402 of the sliding rail 202; the lower end of the eccentric wheel a317 is provided with a notch 318, and the notch 318 is matched with the upper end of the bearing 314; the eccentric wheel b319 is rotatably arranged inside the shell a101, and the lower end of the eccentric wheel b319 is provided with a fixedly connected synchronizing wheel c 320; the synchronizing wheel b316 is rotatably arranged inside the shell a101, a groove is formed in the center of the synchronizing wheel b316, and the groove is matched with the upper end of the bearing 314; the timing wheel b316 and the timing wheel c320 are connected by a timing belt b 315.

In an alternative embodiment of the invention, the transmission part 4 comprises, in addition to the same parts as in the previous embodiment: the opening and closing mechanism and the screwing mechanism; the opening and closing mechanism is arranged in the shell a 101; the screwing mechanism is arranged on the upper part of the opening and closing mechanism; the opening and closing mechanism controls the opening and closing of the two working parts 5 through the force output by the power part 3 so as to clamp a screw; the screwing mechanism only has one work, and the screwing mechanism is used for screwing and unscrewing the screw by forward screwing and backward screwing respectively.

In an alternative implementation of the embodiment of the present invention, the opening and closing mechanism includes, in addition to the same components as in the previous embodiment: bracket 401, chute 402, rack b403, link b407, link c408 and link d 420; the bracket 401 is fixedly arranged inside the shell a 101; a rack b403 is fixedly installed on one side of the chute 402, and the rack b403 is installed inside the shell a101 in a sliding manner; the groove at the lower end of the chute 402 is in sliding connection with the bulge of the eccentric wheel b 319; a cylinder on one end of the connecting rod b407 is rotatably mounted in an outer circular hole on the bracket 401; one end of the connecting rod c408 is rotatably arranged in an inner round hole on the bracket 401; the teeth arranged on the connecting rod c408 are meshed with the rack b 403; the cylinder on link d420 is rotatably mounted in the circular holes on the other side of links b407 and c 408.

In an alternative embodiment of the present invention, the screwing mechanism comprises, apart from the same parts as in the previous embodiment: a spur gear b404, a synchronous gear e405, a synchronous belt c406, a support 409, a bevel gear a410, a synchronous gear f411, a bevel gear b412, a telescopic rod 413, a ratchet 414, a pawl 415, a synchronous gear g416, a positioning block 417, a rack c418 and a synchronous belt d 419; the rack c418 is slidably mounted in a groove on the bracket 401, a positioning block 417 fixedly mounted on the rack c418 is arranged on the positioning block 417, and a circular hole is formed in the positioning block 417 and is matched with the cylinders on two sides of the clamping rod 203; a straight gear b404 is rotatably arranged on a round hole on a connecting rod c408, and a synchronous gear e405 fixedly arranged is arranged on the straight gear b 404; the support 409 is rotatably arranged in circular holes at two ends of the connecting rod b 407; a synchronizing wheel f411 is rotatably arranged on the support 409, and a bevel gear a410 is arranged on the synchronizing wheel f 411; the lower synchronizing wheel f411 is connected with a synchronizing wheel e405 through a synchronizing belt c 406; two ends of the telescopic rod 413 are rotatably arranged in round holes in the support 409, two ends of the telescopic rod 413 are provided with bevel gears b412, and the bevel gears b412 are meshed with the bevel gears a 410; the ratchet wheel 414 is rotatably mounted on an inner circular hole of the connecting rod d420, the pawl 415 is matched with the ratchet wheel 414 for use, a synchronizing wheel g416 is arranged on the pawl 415, and the synchronizing wheel g416 is connected with a synchronizing wheel f411 on the upper side of the connecting rod b407 through a synchronizing belt d 419.

In an alternative implementation of the embodiment of the invention, the working part 5 comprises, apart from the same parts as in the previous embodiment: a shell b501, a spur gear c502, a limiting block b503, a shell c504, a shell d505, a knob b506, a limiting plate 507 and a fixing plate 508; the shell b501 is fixedly arranged on the inner side of the connecting rod d420, and the shell b501 is of a hollow structure; a spur gear c502 is rotatably arranged in the sliding chute 402 inside the shell b 501; spur gear c502 meshes with ratchet 414; the limiting block b503 is slidably mounted in the chute 402 inside the spur gear c 502; the limiting block b503 is provided with an electromagnetic buckle, and an electromagnetic opening can be clamped with a round hole in the straight gear c 502; the shell c504 and the shell d505 are hollow structures, and the shell c504 and the shell d505 are fixedly arranged at one end of the limiting block b 503; the knob b506 is slidably mounted in the sliding groove 402 on the housing d 505; two limiting plates 507 are provided, the limiting plates 507 are fixedly connected, one limiting plate 507 is fixedly connected with a knob b506, and an arc-shaped sliding groove 402 is arranged on the limiting plate 507; the number of the fixing pieces 508 is three, the fixing pieces 508 are slidably mounted in the holes formed by the shell c504 and the shell d505, and the protrusions on the tail ends of the fixing pieces 508 are slidably mounted in the arc-shaped sliding grooves 402 on the limiting plates 507.

The working principle is as follows:

the operating principle of the switching part 2 is: when the button 205 is manually pulled, the button 205 drives the slider 204 to move left and right, the slider 204 drives the connecting rod a206 to rotate, the connecting rod a206 overcomes the elasticity of the spring a207 to enable the slider 204 to be simply positioned and fixed, and the slider 204 drives the clamping rod 203 to move left and right, so that the clamping rod 203 and a positioning block 417 on one transmission part 4 are fixedly clamped; when the eccentric wheel a317 rotates, the eccentric wheel a317 drives the sliding rail 202 to move back and forth, and the sliding rail 202 drives the clamping rod 203 to move so as to control the wrench to be screwed and loosened; the automatic switching function of screwing and loosening of the wrench is realized, the working efficiency is greatly improved, the waste of power is reduced, and the manufacturing cost is reduced.

The working principle of the power mechanism is as follows: when the switch 302 is pressed, the switch 302 controls the motor 301 to work, and the motor 301 drives the synchronizing wheel a303 to rotate; the synchronous wheel a303 drives the synchronous wheel d322 to rotate through the synchronous belt a304, and the synchronous wheel d322 drives the rotating shaft a305 to rotate; the whole power source only needs one, so that the manufacturing cost is greatly reduced, and the resource waste is reduced.

The working principle of the switching mechanism is as follows: when the knob a311 is manually screwed, the knob a311 drives the cam 310 to rotate, the cam 310 drives the rotating shaft b308 to move back and forth by overcoming the elastic force of the spring c309, when the rotating shaft b308 moves, the rotating shaft b308 drives the jacking block 307 to move back and forth, the jacking block 307 drives the rack a306 to move, the rack a306 drives the spur gear a312 to rotate, the spur gear a312 drives the rack a306 on the upper side to move, the rack a306 drives the wedge 313 to move, the wedge 313 clamps the limiting block a321 to move up and down, so that the limiting block a321 drives the bearing 314 to move up and down, and the bearing 314 is connected with the rotating shaft a305 in a sliding manner, so that the bearing 314 is driven to rotate when the; the function of manual switching is realized, so that the opening and closing of the wrench or the twisting can be conveniently adjusted, the working efficiency is greatly improved, the waste of power is reduced, and the manufacturing cost is reduced.

The working principle of the output mechanism is as follows: when the bearing 314 is matched with the synchronous wheel b316, the bearing 314 drives the synchronous wheel b316 to rotate, the synchronous wheel b316 drives the synchronous wheel c320 to rotate through the synchronous belt b315, and the synchronous wheel c320 drives the eccentric wheel b319 to rotate; when the bearing 314 is matched with the notch 318, the bearing 314 drives the notch 318 to rotate, and the notch 318 drives the eccentric wheel a317 to rotate; the power output function is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

The operating principle of the opening and closing mechanism is as follows: when the eccentric wheel b319 rotates, the eccentric wheel b319 drives the chute 402 to move, the chute 402 drives the rack b403 to move back and forth, the rack b403 drives the teeth on the connecting rod c408 to rotate, and the connecting rod c408 and the connecting rod b407 cooperate to drive the connecting rod d420 to move; the connecting rod d420 drives the working part 5 to move; the automatic opening and closing function is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

The working principle of the screwing mechanism is as follows: when the positioning block 417 moves back and forth, the positioning block 417 drives the rack c418 to move, the rack c418 drives the spur gear b404 to rotate, the spur gear b404 drives the synchronizing wheel f411 to rotate through the synchronous belt c406, the synchronizing wheel f411 drives the bevel gear a410 to rotate, the bevel gear a410 drives the bevel gear b412 to rotate, the bevel gear b412 drives the telescopic rod 413 to rotate, the bevel gear b412 on the telescopic rod 413 drives the other bevel gear a410 to rotate, further the synchronizing wheel f411 rotates, the synchronizing wheel f411 drives the synchronizing wheel g416 to rotate through the synchronous belt d419, the synchronizing wheel g416 drives the pawl 415 to rotate, the pawl 415 drives the ratchet 414 to rotate, and when the pawl 415 rotates reversely, the pawl 415 does not drive the ratchet 414 to rotate; the other screwing mechanism is opposite; the automatic screw tightening and loosening device has the advantages that the automatic screw tightening and loosening functions can be realized when the screw is clamped by the wrench, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

The working principle of the working part 5 is as follows: when the two working parts 5 clamp screws, the straight gear c502 starts to rotate, the straight gear c502 drives the limiting block b503 to move, and the limiting block b503 drives the shell c504 and the shell d505 to rotate, so that the function of unscrewing the screws is realized; when the two working parts 5 are screwed, the straight gear c502 is at the middle position, so that the two working parts 5 cannot be loosened, the limiting block b503 is loosened from the straight gear c502, and the straight gear c502 is controlled to reset; the function of automatically adjusting the size and tightening the screws is realized, the working efficiency is greatly improved, the manufacturing cost is reduced, and the waste of power is avoided.

Claims

1. An electric wrench, comprising: the device comprises a shell part (1), a switching part (2), a power part (3), a transmission part (4) and a working part (5); the switching part (2) to the working part (5) are arranged inside the shell part (1); the shell part (1) is a hollow structure, and the shell part (1) comprises a shell a (101) and a handle (102); the grip (102) is fixedly connected with the shell a (101); the number of the transmission parts (4) is two, and the transmission parts (4) are arranged at the upper end of the power part (3); the switching part (2) is arranged at the upper end of the transmission part (4); one end of each transmission part (4) is provided with a working part (5); the power part (3) is used as an integral power source and control and can control the opening and closing and screwing of the wrench; the transmission part (4) is used for power transmission of the working part (5) and plays a role in power transmission; the switching part (2) can switch the mode of the power transmitted from the transmission part (4) to the working part (5), and can control the forward screwing and the backward screwing of the working part (5); the working part (5) has the function of manually adjusting the size, so that the wrench can adapt to screws with different sizes.

2. An electric wrench as claimed in claim 1, characterized in that said switching portion (2) comprises: the device comprises a base (201), a sliding rail (202), a clamping rod (203), a sliding block (204), a button (205), a connecting rod a (206), a spring a (207) and a spring b (208); the upper end of the sliding rail (202) is slidably arranged in the middle of the base (201); a bulge in the middle of the clamping rod (203) is slidably arranged in a groove at the upper end of the sliding rail (202); two sides of the sliding block (204) are slidably arranged at two ends of the base (201); the button (205) is fixedly arranged at one end of the sliding block (204); a round hole at one end of a connecting rod a (206) is rotatably arranged on a cylinder on the base (201), and a groove arranged at the other end of the connecting rod a (206) is in sliding connection with the cylinder on the sliding block (204); one end of a spring a (207) is fixedly connected with the base (201), and the other end of the spring a (207) is fixedly connected with a cylinder on the connecting rod a (206); two springs b (208) are arranged and are arranged on two sides of the bulge of the clamping rod (203), and the other end of each spring b (208) is fixedly connected with the inner wall of the groove of the sliding rail (202).

3. An electric wrench as claimed in claim 1, characterized in that said power section (3) comprises: the device comprises a power mechanism, a switching mechanism and an output mechanism; the switching mechanism is arranged at the upper end of the power mechanism; the output mechanism is arranged at the upper end of the switching mechanism; the power mechanism is an integral power source, and the switching mechanism can control the opening, closing and screwing of the integral wrench; the output mechanism outputs the power transmitted by the power mechanism through the switching mechanism.

4. The power wrench as claimed in claim 3, wherein the power mechanism comprises: the device comprises a motor (301), a synchronous wheel a (303), a synchronous belt a (304), a rotating shaft a (305) and a synchronous wheel d (322); the motor (301) is fixedly arranged in the grip (102); the switch (302) is fixedly arranged on the outer wall of the grip (102) and is connected with the motor (301) through a lead; the synchronous wheel a (303) is fixedly arranged on a motor (301) shaft of the motor (301); the rotating shaft a (305) is rotatably arranged in the handle (102), the lower end of the rotating shaft a (305) is provided with a fixedly connected synchronizing wheel d (322), and the synchronizing wheel d (322) is connected with the synchronizing wheel a (303) through a synchronizing belt a (304).

5. The electric wrench as claimed in claim 3, wherein the switching mechanism comprises: the device comprises a rack a (306), a top block (307), a rotating shaft b (308), a spring c (309), a cam (310), a knob a (311), a spur gear a (312), a wedge block (313), a limiting block a (321) and a bearing (314); the bearing (314) is rotatably arranged in the handle (102), the lower end of the bearing (314) is in sliding connection with the rotating shaft a (305), and a clamping block is arranged at the upper end of the bearing (314); the cam (310) is rotatably arranged inside the grip (102), and the knob a (311) is fixedly arranged at the outer end of the cam (310); the rotating shaft b (308) is rotatably arranged in the handle (102), a clamping block of the rotating shaft b (308) is matched with a groove on the cam (310), the outer end of the rotating shaft b (308) is provided with a spring c (309), and the left end of the spring c (309) is fixedly connected with one end of the cam (310); the top block (307) is rotatably arranged at the right end of the rotating shaft b (308); one side of the top block (307) is provided with two racks a (306); the straight gear a (312) is rotatably arranged inside the grip (102); the rack a (306) is meshed with a straight gear a (312); the number of the wedge blocks (313) is two, one end of each wedge block (313) is provided with a rack a (306), and the racks a (306) are slidably mounted in the handle (102); the limiting block a (321) is rotatably arranged on a bulge in the middle of the bearing (314), clamping blocks are arranged at two ends of the limiting block a (321), and the clamping blocks are matched with the matching blocks (313).

6. The power wrench as claimed in claim 3, wherein said output mechanism includes: a synchronous belt b (315), a synchronous wheel b (316), an eccentric wheel a (317), a notch (318), an eccentric wheel b (319) and a synchronous wheel c (320); the eccentric wheel a (317) is rotatably arranged in the shell a (101), and a clamping block arranged on the eccentric wheel a (317) is in sliding connection with a sliding groove (402) of the sliding rail (202); the lower end of the eccentric wheel a (317) is provided with a notch (318), and the notch (318) is matched with the upper end of the bearing (314); the eccentric wheel b (319) is rotatably arranged inside the shell a (101), and the lower end of the eccentric wheel b (319) is provided with a fixedly connected synchronous wheel c (320); the synchronizing wheel b (316) is rotatably arranged inside the shell a (101), a groove is formed in the center of the synchronizing wheel b (316), and the groove is matched with the upper end of the bearing (314); the synchronizing wheel b (316) and the synchronizing wheel c (320) are connected by a synchronizing belt b (315).

7. An electric wrench as claimed in claim 1, characterized in that said transmission part (4) comprises: the opening and closing mechanism and the screwing mechanism; the opening and closing mechanism is arranged in the shell a (101); the screwing mechanism is arranged on the upper part of the opening and closing mechanism; the opening and closing mechanism controls the opening and closing of the two working parts (5) through the force output by the power part (3) so as to clamp a screw; the screwing mechanism only has one work, and the screwing mechanism is used for screwing and unscrewing the screw by forward screwing and backward screwing respectively.

8. The electric wrench as claimed in claim 7, wherein the opening and closing mechanism comprises: the device comprises a bracket (401), a sliding chute (402), a rack b (403), a connecting rod b (407), a connecting rod c (408) and a connecting rod d (420); the bracket (401) is fixedly arranged in the shell a (101); one side of the sliding chute (402) is fixedly provided with a rack b (403), and the rack b (403) is slidably arranged in the shell a (101); the groove at the lower end of the chute (402) is in sliding connection with the bulge of the eccentric wheel b (319); a cylinder on one end of the connecting rod b (407) is rotatably arranged in an outer circular hole on the bracket (401); a cylinder at one end of the connecting rod c (408) is rotatably arranged in an inner circular hole on the bracket (401); the teeth arranged on the connecting rod c (408) are meshed with the rack b (403); the cylinder on the connecting rod d (420) is rotatably arranged in the circular holes on the other sides of the connecting rod b (407) and the connecting rod c (408).

9. The power wrench as claimed in claim 7, wherein said driving mechanism includes: a straight gear b (404), a synchronous gear e (405), a synchronous belt c (406), a support (409), a bevel gear a (410), a synchronous gear f (411), a bevel gear b (412), an expansion rod (413), a ratchet wheel (414), a pawl (415), a synchronous gear g (416), a positioning block (417), a rack c (418) and a synchronous belt d (419); the rack c (418) is slidably arranged in a groove on the bracket (401), a positioning block (417) fixedly arranged is arranged on the rack c (418), a round hole is arranged on the positioning block (417), and the round hole is matched with the cylinders at two sides of the clamping rod (203); a straight gear b (404) is rotatably arranged on a round hole on the connecting rod c (408), and a synchronous gear e (405) fixedly arranged is arranged on the straight gear b (404); the support (409) is rotatably arranged in round holes at two ends of the connecting rod b (407); a synchronizing wheel f (411) is rotatably arranged on the support (409), and a bevel gear a (410) is arranged on the synchronizing wheel f (411); the lower synchronizing wheel f (411) is connected with a synchronizing wheel e (405) through a synchronizing belt c (406); two ends of the telescopic rod (413) are rotatably arranged in round holes in the support (409), two ends of the telescopic rod (413) are provided with bevel gears b (412), and the bevel gears b (412) are meshed with the bevel gears a (410); the ratchet wheel (414) is rotatably arranged on an inner round hole of the connecting rod d (420), the pawl (415) is rotatably arranged on the inner round hole of the connecting rod d (420), the pawl (415) is matched with the ratchet wheel (414) for use, a synchronous wheel g (416) is arranged on the pawl (415), and the synchronous wheel g (416) is connected with a synchronous wheel f (411) on the upper side of the connecting rod b (407) through a synchronous belt d (419).

10. An electric wrench as claimed in claim 1, characterized in that said working portion (5) comprises: the device comprises a shell b (501), a spur gear c (502), a limiting block b (503), a shell c (504), a shell d (505), a knob b (506), a limiting plate (507) and a fixing plate (508); the shell b (501) is fixedly arranged on the inner side of the connecting rod d (420), and the shell b (501) is of a hollow structure; the straight gear c (502) is rotatably arranged in a chute (402) in the shell b (501); the straight gear c (502) is meshed with the ratchet wheel (414); the limiting block b (503) is slidably mounted in the chute (402) in the straight gear c (502); the limiting block b (503) is provided with an electromagnetic buckle, and an electromagnetic opening can be clamped with a round hole in the straight gear c (502); the shell c (504) and the shell d (505) are hollow structures, and the shell c (504) and the shell d (505) are fixedly arranged at one end of the limiting block b (503); the knob b (506) is slidably arranged in a sliding groove (402) on the shell d (505); two limiting plates (507) are provided, the limiting plates (507) are fixedly connected, one limiting plate (507) is fixedly connected with the knob b (506), and the limiting plate (507) is provided with an arc-shaped sliding groove (402); the number of the fixing plates (508) is three, the fixing plates (508) are slidably mounted in a hole formed by the shell c (504) and the shell d (505), and a bulge on the tail end of each fixing plate (508) is slidably mounted in the arc-shaped sliding groove (402) on the limiting plate (507).