CN111002261B

CN111002261B - Preset bidirectional electric torque wrench

Info

Publication number: CN111002261B
Application number: CN201911375200.4A
Authority: CN
Inventors: 莫双龙
Original assignee: Nanjing Hanxiyue Automation Technology Co Ltd
Current assignee: Zhejiang Sharp Tools Manufacture Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-04-23
Anticipated expiration: 2039-12-27
Also published as: CN111002261A

Abstract

The invention relates to a torque wrench, in particular to a preset type bidirectional electric torque wrench. The technical problem to be solved is how to design a preset type bidirectional electric torque wrench which has fewer electric devices, is convenient to maintain and has lower technical requirements on maintenance personnel. A preset two-way electric torque wrench comprises a handle, a shell, a connecting pipe, a speed reducing motor, a diamond shaft, a large torque regulator and the like; the upper part and the lower part of the shell are respectively connected with a connecting pipe and a handle, a speed reducing motor is arranged in the shell, an output shaft of the speed reducing motor is connected with a diamond shaft, the diamond shaft is positioned in the connecting pipe, the lower part in the connecting pipe is at least provided with four large moment regulators, and the large moment regulators are in transmission connection with the diamond shaft. The bolt is screwed down by driving the first square driving head and the second square driving head to rotate through the speed reducing motor, and the moment is adjusted by adopting a mechanical structure, so that the bolt has the advantage of convenience in maintenance.

Description

Preset bidirectional electric torque wrench

Technical Field

The invention relates to a torque wrench, in particular to a preset type bidirectional electric torque wrench.

Background

The torque wrench is also called torque wrench and torque adjustable wrench, and is one kind of wrench. According to the power source, the method can be divided into: electric torque wrench, pneumatic torque wrench, hydraulic torque wrench and manual torque wrench; manual torque wrenches can be divided into: presetting, constant value type, dial type, digital display type, sliding type, bending type and kilogram type wrench. The use of a torque wrench may allow an operator to apply a particular torque value when the tightness of the screw and bolt is critical.

After retrieval; the publication number is: CN109366412A patent discloses an electrodynamic torque wrench for suspension, which comprises a handle body and a wrench head, wherein a driving head is embedded in the middle of the wrench head, the bottom end of the driving head is connected with a square tenon, a gear seat screw is connected with the wrench head through a thread, a forward and reverse switch is arranged beside the gear seat screw, a sensor is embedded in the front end of the handle body, a handle is arranged at the rear end of the handle body, a datum line is arranged on the handle, a battery cover is arranged at the tail end of the handle, and the battery cover is connected at the tail end of the handle through a hinge at one end. Above-mentioned patent exists following not enough, and the electrical part that its set up is more, and the maintenance is troublesome, and is higher to maintenance personal's technical requirement, and secondly, uses the battery to supply the power consumption of torque wrench, is difficult to realize the fastening of big moment of torsion bolt, and battery life is difficult to guarantee moreover.

Disclosure of Invention

In order to overcome that present electronic torque wrench electrical part is more, and the maintenance is troublesome, and is higher to maintenance personal's technical requirement, is difficult to realize the shortcoming of the fastening of big moment of torsion bolt moreover, the technical problem that solves is: the preset bidirectional electric torque wrench has fewer electric devices, is convenient to maintain, and has lower technical requirements on maintenance personnel.

The technical scheme of the invention is as follows: a preset bidirectional electric torque wrench comprises a handle, a shell, a connecting pipe, a speed reducing motor and a diamond shaft, wherein the upper part and the lower part of the shell are respectively connected with the connecting pipe and the handle, the speed reducing motor is arranged in the shell, an output shaft of the speed reducing motor is connected with the diamond shaft, the diamond shaft is positioned in the connecting pipe, the torque wrench also comprises a large torque regulator, a slide block, an inserting rod, an inner diamond pipe, a positioning component, a transmission component and a first square driving head, the lower part in the connecting pipe is at least provided with four large torque regulators, the large torque regulators are in transmission connection with the diamond shaft, the slide block is arranged in the connecting pipe above the large torque regulators in a sliding way, the bottom of the slide block is connected with the inserting rod used for connecting the large torque regulators, the top of the slide block is connected with the inner diamond pipe, the inner diamond pipe is positioned in the connecting pipe, the positioning, the right end of the top of the connecting pipe is rotatably connected with a first square driving head, and the transmission assembly is in transmission connection with the first square driving head and the inner diamond-shaped pipe respectively.

In one of them embodiment, big moment regulator is including circular base, interior rhombus pole, the pressure spring, the connecting block, touch multitouch and contact switch, circular base sets up in the connecting tube rotatoryly, circular base's centre of a circle position rotation type is connected with the interior rhombus pole that supplies the rhombus axle to pass, it has the arc wall to open on the circular base, the arc wall is located the interior rhombus pole outside, be equipped with the pressure spring in the arc wall, the lateral surface of interior rhombus pole is connected with the connecting block, connecting block and pressure spring trailing end connection, circular base top one side is equipped with contact switch, be connected with the touch multitouch that is used for triggering contact switch on the connecting block, contact switch is connected with gear motor electricity.

In one embodiment, the positioning assembly comprises a sliding ring, a screw rod and a thread limiting part, through grooves are formed in two sides of the lower portion of the connecting pipe, the sliding ring is rotatably arranged on the outer side of the sliding block, the screw rod is fixedly connected to the sliding ring and penetrates through the through groove in one side, the thread limiting part is connected to the tail end of the screw rod in a threaded mode, and the thread limiting part is located on the outer side of the connecting pipe.

In one embodiment, the transmission assembly comprises a diamond connecting rod, a worm wheel and a first rotating shaft, the diamond connecting rod is slidably arranged on the inner side of the inner diamond pipe and rotatably connected with the inner wall of the connecting pipe, the worm is connected to the top end of the diamond connecting rod, the worm wheel is rotatably arranged on the top in the connecting pipe and meshed with the worm, and the first rotating shaft is connected between the worm wheel and the first square driving head.

In one embodiment, the device also comprises a small moment adjuster which comprises a hollow disc, a second rotating shaft, a driving gear and a sliding frame, driven gear, the volute spiral spring, adjusting bolt and the square drive head of second, be connected with hollow dish connecting pipe top left end rotary type, the side that first square drive head was kept away from to the worm wheel is connected with the second pivot, the second pivot penetrates in hollow dish and is connected with the driving gear, the driving gear is located the centre of a circle position of hollow dish, circumference evenly spaced is equipped with four carriages on the hollow dish, carriage and hollow dish sliding fit, be equipped with the driven gear with driving gear engagement on the carriage with the rotation type, be equipped with the volute spiral spring between driven gear and the carriage, be equipped with adjusting bolt on the carriage with the rotation type, adjusting bolt wears out the hollow dish outside, adjusting bolt and hollow dish threaded connection, one side that the connecting pipe was kept away from to hollow dish is connected with the square.

In one embodiment, the connecting pipe further comprises a graduated scale and a pointer, the graduated scale is connected to the outer wall of the lower portion of the connecting pipe, the pointer is connected to one side, away from the screw rod, of the sliding ring, and the pointer penetrates through the through groove and is located on the front side of the graduated scale.

In one embodiment, the total torque of the small torque actuators is less than the torque of a single large torque actuator.

In one embodiment, the torque of the large torque regulator is 50N.m, the total torque of the small torque regulator is 40N.m, and the torque of the single wrap spring compressed to the limit state is 10 N.m.

The torque wrench has the advantages that the speed reduction motor drives the first square driving head and the second square driving head to rotate so as to tighten the bolts, the torque adjustment is mechanical structure, the torque wrench has the advantages of convenience in maintenance and low technical requirements on maintenance personnel, the small torque adjuster can reasonably tighten the bolts with high torque requirements, the tightening torque of the bolts is more accurate, the bolts with different torque requirements can be fastened, and the practicability and the flexibility of the torque wrench are improved.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a partial front enlarged view of the present invention.

FIG. 3 is a schematic cross-sectional top view of the high torque moment adjuster of the present invention.

Fig. 4 is a perspective view of the positioning assembly of the present invention.

Fig. 5 is an enlarged view of part a of the present invention.

FIG. 6 is a left side cross-sectional schematic view of the low torque regulator of the present invention.

Wherein the figures include the following reference numerals: 1. the novel hydraulic control gear comprises a handle, 2 parts of a shell, 3 parts of a connecting pipe, 4 parts of a speed reducing motor, 5 parts of a diamond shaft, 6 parts of a large torque regulator, 61 parts of a circular base, 62 parts of an inner diamond rod, 63 parts of a pressure spring, 64 parts of a connecting block, 65 parts of a contact block, 66 parts of a contact switch, 7 parts of a sliding block, 71 parts of an inserting rod, 8 parts of an inner diamond pipe, 9 parts of a positioning assembly, 91 parts of a sliding ring, 92 parts of a screw rod, 93 parts of a thread limiting piece, 10 parts of a transmission assembly, 101 parts of a diamond connecting rod, 102 parts of a worm, 103 parts of a worm wheel, 104 parts of a first rotating shaft, 11 parts of a first square driving head, 12 parts of a small torque regulator, 121 parts of a hollow disc, 122 parts of a second rotating shaft, 123 parts of a driving gear, 124 parts of a sliding frame, 125 parts of a driven gear, 126 parts of.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Example one

As shown in fig. 1-2, a preset two-way electric torque wrench comprises a handle 1, a housing 2, a connecting pipe 3, a speed reducing motor 4 and a diamond shaft 5, wherein the upper part and the lower part of the housing 2 are respectively connected with the connecting pipe 3 and the handle 1, the connecting pipe 3 and the handle 1 are both connected with the housing 2 through a bolt connection mode, the connecting pipe 3 is in a T shape, the speed reducing motor 4 is installed in the housing 2, the diamond shaft 5 is connected with an output shaft of the speed reducing motor 4, the diamond shaft 5 is positioned in the connecting pipe 3, the preset two-way electric torque wrench further comprises a large torque regulator 6, a sliding block 7, an inserted rod 71, an inner diamond pipe 8, a positioning component 9, a transmission component 10 and a first square driving head 11, six large torque regulators 6 are arranged at the inner lower part of the connecting pipe 3, the large torque regulators 6 are in transmission connection with the diamond shaft 5, the sliding block 7 is arranged in, the shape of slider 7 is cylindrical, slider 7 bottom is connected with the inserted bar 71 that is used for connecting big moment regulator 6, inserted bar 71 is equipped with two altogether, slider 7 top is connected with interior diamond pipe 8, interior diamond pipe 8 is located connecting pipe 3, interior diamond pipe 8 and connecting pipe 3 sliding type are connected, the slider 7 outside is equipped with locating component 9, locating component 9 is used for fixed slider 7, upper portion is equipped with drive assembly 10 in the connecting pipe 3, connecting pipe 3 top right-hand member rotary type ground is connected with first square drive head 11, drive assembly 10 is connected with first square drive head 11 and interior diamond pipe 8 transmission respectively.

When the bolt is screwed, the hexagonal sleeve is fixed on the first square driving head 11, the handle 1 is held by a hand, the speed reduction motor 4 is started to drive the diamond shaft 5 to rotate, the diamond shaft 5 rotates to drive the inserting rod 71 and the sliding block 7 to rotate through the large-torque regulator 6, the inner diamond pipe 8 rotates to drive the transmission assembly 10 to rotate, the transmission assembly 10 rotates to drive and drives the hexagonal sleeve to rotate through the first square driving head 11, the bolt can be screwed, and when the bolt is fastened or loosened, the speed reduction motor 4 can be driven to rotate forwards or backwards to adjust. When the bolt tightening torque reaches a preset value, the circuit of the speed reducing motor 4 can be automatically disconnected under the action of the large torque regulator 6, so that the bolt is protected from being damaged. People can pull up and down the positioning assembly 9 to drive the sliding block 7 to move, so that the numerical value of the preset moment is adjusted through the movement of the inserting rod 71, the larger the upward movement distance of the inserting rod 71 is, the smaller the number of the inserting rod 71 connected with the large moment adjuster 6 is, the smaller all the preset moments are, and vice versa. When the positions of the sliding block 7 and the insertion rod 71 are moved to the preset position, the sliding block 7 can be fixed through the positioning assembly 9, and the sliding block 7 is prevented from being displaced during work.

As shown in fig. 3, the large torque regulator 6 includes a circular base 61, an inner diamond rod 62, a compression spring 63, connecting block 64, touch multitouch 65 and contact switch 66, circular base 61 sets up in connecting pipe 3 rotatoryly, the centre of a circle position rotation type of circular base 61 is connected with the interior rhombus pole 62 that supplies rhombus axle 5 to pass, it has the arc wall to open on the circular base 61, the arc wall is located the interior rhombus pole 62 outside, be equipped with pressure spring 63 in the arc wall, it is specific, the arc wall plays limiting displacement to pressure spring 63, the lateral surface of interior rhombus pole 62 is connected with connecting block 64, connecting block 64 and arc wall sliding fit, connecting block 64 and pressure spring 63 trailing end connection, circular base 61 top one side is equipped with contact switch 66, be connected with the touch multitouch 65 that is used for triggering contact switch 66 on the connecting block 64, contact switch 66 is connected with gear motor 4 electricity, circular base 61 and inserted bar.

The diamond shaft 5 rotates to drive the inner diamond rod 62 to rotate, the round base 61 rotates along with the inner diamond shaft under the action of the pressure spring 63, the round base 61 rotates to drive the inserted rod 71 and the sliding block 7 to rotate, when the bolt is screwed down to reach a certain torque, the inner diamond rod 62 can drive the connecting block 64 to extrude the pressure spring 63, the pressure spring 63 is gradually compressed, when the contact block 65 touches the contact switch 66, the contact switch 66 disconnects the power supply of the speed reducing motor 4, the first square driving head 11 stops rotating, the bolt can be protected, and the bolt is prevented from being broken or slipping. When the hexagonal sleeve is taken out of the bolt, the circular base 61 and the connecting block 64 can be driven to reset under the resetting action of the pressure spring 63, so that the hexagonal sleeve is convenient to use subsequently. When the bolt is unscrewed, the speed reduction motor 4 can be started to rotate reversely, the diamond shaft 5 and the inner diamond rod 62 rotate along with the diamond shaft, at the moment, the arc-shaped groove blocks the connecting block 64, so that the circular base 61 can be driven to rotate reversely through the connecting block 64, and the bolt is unscrewed.

Example two

On the basis of the first embodiment, as shown in fig. 2 and 4, the positioning assembly 9 includes a sliding ring 91, a screw rod 92 and a thread limiting member 93, through grooves are formed on both sides of the lower portion of the connecting pipe 3, the sliding ring 91 is rotatably disposed on the outer side of the slider 7, the screw rod 92 is fixedly connected to the sliding ring 91, the screw rod 92 and the sliding ring 91 are integrally formed, the screw rod 92 penetrates through the through groove on one side, the thread limiting member 93 is connected to the tail end of the screw rod 92 in a threaded manner, and the thread limiting member 93 is located on the outer side.

When the preset torque needs to be adjusted, the thread limiting part 93 can be pulled upwards or downwards, the thread limiting part 93 drives the screw rod 92 to move and the sliding ring 91 to move, the sliding block 7 moves along with the screw rod, when the sliding block 7 moves to the preset position, the thread limiting part 93 is screwed down, the surface of the thread limiting part 93 is tightly attached to the outer surface of the connecting pipe 3, the sliding block 7 can be fixed, and the sliding block 7 is prevented from moving.

As shown in fig. 5, the transmission assembly 10 includes a diamond connecting rod 101, a worm 102, a worm wheel 103 and a first rotating shaft 104, the diamond connecting rod 101 is slidably disposed inside the inner diamond pipe 8, the diamond connecting rod 101 is rotatably connected to the inner wall of the connecting pipe 3, the worm 102 is connected to the top end of the diamond connecting rod 101, the worm 102 is connected to the diamond connecting rod 101 through a coupling, the worm wheel 103 is rotatably disposed on the top of the connecting pipe 3, the worm wheel 103 is disposed on the horizontal portion of the connecting pipe 3, the worm wheel 103 is engaged with the worm 102, and the first rotating shaft 104 is connected between the worm wheel 103 and the first square driving head 11.

When the sliding block 7 moves up and down, the inner rhombic tube 8 slides up and down on the rhombic connecting rod 101, the inner rhombic tube 8 is always connected with the rhombic connecting rod 101, the inner rhombic tube 8 rotates to drive the rhombic connecting rod 101 to rotate, the worm 102 rotates along with the inner rhombic tube, the worm 102 rotates to drive the worm wheel 103 to rotate, and the worm wheel 103 drives the first square driving head 11 to rotate.

EXAMPLE III

On the basis of the second embodiment, as shown in fig. 5-6, the small torque regulator 12 further includes a small torque regulator 12, the small torque regulator 12 includes a hollow disc 121, a second rotating shaft 122, a driving gear 123, a sliding frame 124, a driven gear 125, a spiral spring 126, a regulating bolt 127 and a second square driving head 128, the hollow disc 121 is rotatably connected to the left end of the top of the connecting pipe 3, the second rotating shaft 122 is connected to the side of the worm gear 103 away from the first square driving head 11, the second rotating shaft 122 is connected to the worm gear 103 by interference connection, the second rotating shaft 122 penetrates through the hollow disc 121 and is connected to the driving gear 123, the driving gear 123 is located at the center of the hollow disc 121, four sliding frames 124 are uniformly spaced on the hollow disc 121 in the circumferential direction, the sliding frames 124 are in sliding fit with the hollow disc 121, the driven gear 125 engaged with the driving gear 123 is rotatably provided on the sliding frames 124, the spiral spring 126 is provided between, the scroll spring 126 is arranged inside the driven gear 125, the sliding rack 124 is rotatably provided with an adjusting bolt 127, the adjusting bolt 127 penetrates through the outer side of the hollow disc 121, the adjusting bolt 127 is in threaded connection with the hollow disc 121, and one side of the hollow disc 121 far away from the connecting pipe 3 is connected with a second square driving head 128.

When a bolt with a high requirement on torque needs to be screwed down, the hexagonal sleeve can be fixed on the second square driving head 128, the positions of the sliding block 7 and the insertion rod 71 are adjusted through the positioning component 9, the insertion rod 71 is connected with a proper number of large torque regulators 6, and therefore the torque value is roughly preset, and the large torque regulators are fixed through the positioning component 9 after the torque value is set. Then, the adjusting bolt 127 can be screwed, the adjusting bolt 127 rotates to drive the sliding rack 124 to move close to the direction of the driving gear 123, when the driven gear 125 is meshed with the driving gear 123, the screwing of the adjusting bolt 127 is stopped, and the more the number of the meshed driven gears 125 and the driving gear 123 is, the larger the moment is. When the bolt is tightened, the worm wheel 103 rotates to drive the second rotating shaft 122 to rotate, the driving gear 123 rotates along with the second rotating shaft, the hollow disc 121 is driven to rotate under the action of the scroll spring 126, the hollow disc 121 rotates to drive the second square driving head 128 and the hexagonal sleeve to rotate, the bolt is tightened, when the bolt is tightened to a certain degree, the driving gear 123 rotates to drive the driven gear 125 to rotate on the sliding frame 124, the scroll spring 126 compresses, when the scroll spring 126 compresses to a limit state, the hollow disc 121 continues to be driven to rotate, and the large-torque regulator 6 is enabled to act until the torque force for tightening the bolt reaches a preset value.

As shown in fig. 1, the connecting pipe further comprises a graduated scale 13 and a pointer 14, the graduated scale 13 is connected to the outer wall of the lower portion of the connecting pipe 3, the length of the graduated scale 13 is slightly greater than that of the through groove, the pointer 14 is connected to one side of the sliding ring 91, which is far away from the screw 92, and the pointer 14 passes through the through groove and is located on the front side of the graduated scale 13.

When the sliding ring 91 moves, the sliding block 7 and the pointer 14 move along with the sliding ring, and the number of the inserted rods 71 connected with the large moment regulator 6 can be known through the position of the pointer 14 on the graduated scale 13, so that the presetting of the moment value is convenient to adjust.

The above description is only an example of the present invention and is not intended to limit the present invention. All equivalents which come within the spirit of the invention are therefore intended to be embraced therein. Details not described herein are well within the skill of those in the art.

Claims

1. The utility model provides a two-way electric torque wrench of preset, including handle (1), casing (2), connecting pipe (3), gear motor (4) and rhombus axle (5), the upper and lower two parts of casing (2) do not are connected with connecting pipe (3) and handle (1), install gear motor (4) in casing (2), be connected with rhombus axle (5) on the output shaft of gear motor (4), rhombus axle (5) are located connecting pipe (3), its characterized in that: the large torque adjusting device is characterized by further comprising large torque regulators (6), sliders (7), insertion rods (71), inner diamond-shaped pipes (8), positioning components (9), transmission components (10) and first square driving heads (11), at least four large torque regulators (6) are arranged on the inner lower portion of the connecting pipe (3), the large torque regulators (6) are in transmission connection with the diamond-shaped shafts (5), the sliders (7) are arranged in the connecting pipe (3) above the large torque regulators (6) in a sliding mode, the bottoms of the sliders (7) are connected with the insertion rods (71) used for being connected with the large torque regulators (6), the inner diamond-shaped pipes (8) are connected to the tops of the sliders (7), the inner diamond-shaped pipes (8) are located in the connecting pipe (3), the positioning components (9) are arranged on the outer sides of the sliders (7), the positioning components (9) are used for fixing the sliders (7), the transmission components (10) are arranged on the inner upper portion of the connecting pipe (3), the first square driving, the transmission assembly (10) is respectively in transmission connection with the first square driving head (11) and the inner diamond-shaped pipe (8).

2. The preset, bi-directional electric torque wrench of claim 1, wherein: the large-torque regulator (6) comprises a circular base (61), an inner diamond-shaped rod (62), a pressure spring (63), a connecting block (64), a contact block (65) and a contact switch (66), wherein the circular base (61) is rotationally arranged in the connecting pipe (3), the circle center position of the circular base (61) is rotationally connected with the inner diamond-shaped rod (62) for the diamond-shaped shaft (5) to pass through, an arc-shaped groove is formed in the circular base (61) and is positioned on the outer side of the inner diamond-shaped rod (62), the pressure spring (63) is arranged in the arc-shaped groove, the outer side surface of the inner diamond-shaped rod (62) is connected with the connecting block (64), the connecting block (64) is connected with the tail end of the pressure spring (63), the contact switch (66) is arranged on one side of the top of the circular base (61), the contact block (65) used for triggering the contact switch (66) is connected onto the, the round base (61) is in sliding fit with the inserted rod (71).

3. A preset, two-way electric torque wrench as claimed in claim 2, wherein: the positioning assembly (9) comprises a sliding ring (91), a screw rod (92) and a thread limiting part (93), through grooves are formed in two sides of the lower portion of the connecting pipe (3), the sliding ring (91) is arranged on the outer side of the sliding block (7) in a rotating mode, the screw rod (92) is fixedly connected to the sliding ring (91), the screw rod (92) penetrates out of the through grooves in one side, the thread limiting part (93) is connected to the tail end of the screw rod (92) in a threaded mode, and the thread limiting part (93) is located on the outer side of.

4. A preset reversible electric torque wrench as claimed in claim 3, wherein: transmission assembly (10) is including rhombus connecting rod (101), worm (102), worm wheel (103) and first pivot (104), interior rhombus venturi tube (8) inboard is equipped with rhombus connecting rod (101) with sliding type, rhombus connecting rod (101) rotary type ground and connecting pipe (3) inner wall connection, rhombus connecting rod (101) top is connected with worm (102), top rotary type ground is equipped with worm wheel (103) in connecting pipe (3), worm wheel (103) and worm (102) meshing, be connected with first pivot (104) between worm wheel (103) and first square drive head (11).

5. The preset, bi-directional electric torque wrench of claim 4, wherein: the small torque regulator is characterized by further comprising a small torque regulator (12), the small torque regulator (12) comprises a hollow disc (121), a second rotating shaft (122), a driving gear (123), a sliding frame (124), a driven gear (125), a volute spring (126), an adjusting bolt (127) and a second square driving head (128), the left end of the top of the connecting pipe (3) is rotatably connected with the hollow disc (121), the side, away from the first square driving head (11), of the worm wheel (103) is connected with the second rotating shaft (122), the second rotating shaft (122) penetrates into the hollow disc (121) and is connected with the driving gear (123), the driving gear (123) is located at the circle center of the hollow disc (121), the four sliding frames (124) are uniformly arranged on the hollow disc (121) in a circumferential direction at intervals, the sliding frames (124) are in sliding fit with the hollow disc (121), the driven gear (125) meshed with the driving gear (123) is rotatably arranged, a volute spiral spring (126) is arranged between the driven gear (125) and the sliding frame (124), an adjusting bolt (127) is arranged on the sliding frame (124) in a rotating mode, the adjusting bolt (127) penetrates out of the outer side of the hollow disc (121), the adjusting bolt (127) is in threaded connection with the hollow disc (121), and a second square driving head (128) is connected to one side, away from the connecting pipe (3), of the hollow disc (121).

6. The preset, bi-directional electric torque wrench of claim 5, wherein: still including scale (13) and pointer (14), connecting pipe (3) lower part outer wall is connected with scale (13), and one side that screw rod (92) were kept away from in slip ring (91) is connected with pointer (14), and pointer (14) pass logical groove and are located scale (13) front side.

7. The preset, bi-directional electric torque wrench of claim 6, wherein: the total torque of the small torque adjuster (12) is smaller than the torque of the single large torque adjuster (6).

8. The preset, bi-directional electric torque wrench of claim 7, wherein: the torque of the large torque regulator (6) is 50N.m, the total torque of the small torque regulator (12) is 40N.m, and the torque of the single scroll spring (126) compressed to the limit state is 10 N.m.