CN116460783A - A torque screwdriver without reverse torque - Google Patents

Abstract

The application relates to the technical field of repair tools, in particular to a torque screwdriver without reverse torque. There are several inner hole grooves on the side wall, the power transmission ball is located in the inner hole groove, the power transmission ball drives the force transmission frame and the tripping groove ring to rotate synchronously, the tripping groove ring is fixedly connected with the handle, and after the torque of the screwdriver is reached, the power transmission ball is switched to the adjacent inner hole groove; the bearing ball, the outer wall of the power transmission ball is connected with the outer wall of the bearing ball, and the bearing ball is located in the force transmission frame; the elastic member is used to make the force transmission frame return after the outer wall of the force sliding core slides. This application has the effect of reducing the deviation of the torque when the screwdriver tightens the screw rod.

Description

A torque screwdriver without reverse torque

technical field

The present application relates to the technical field of repair tools, in particular to a torque screwdriver without reverse torque.

Background technique

In daily life, the frequency of use of the screwdriver is very high, and it is the most commonly used tool in people's life, which plays a role in fastening and dismounting screws.

Currently, a screwdriver includes a handle and a knife rod with one end disposed in the handle, and a knife head is disposed at the other end of the handle. When in use, the worker twists the screw rod through the cutter head to adjust the tightness of the screw rod.

When tightening the screw with the above-mentioned screwdriver, when the torque peak value is reached, there will be a small reverse torque. In the case of a large torque peak, this reverse torque can be ignored. However, on a screwdriver with a small torque, the existence of the reverse torque will cause torque deviation. There is a problem of poor precision of the screwdriver, and there is room for improvement.

Contents of the invention

In order to reduce the reverse torque generated when the screwdriver tightens the screw, reduce the torque deviation when tightening the screw, and improve the accuracy of the screwdriver, the present application provides a torque screwdriver without reverse torque.

A torque screwdriver without reverse torque provided by the application adopts the following technical scheme:

A torque screwdriver without reverse torque, comprising a knife handle and a knife rod with one end arranged in the inner cavity of the knife handle, and also comprising

A stressed sliding core, the stressed sliding core is fixedly connected to the cutter bar;

A force transmission frame, the force transmission frame is sleeved on the outer wall of the stressed sliding core, the force transmission frame can slide along the length direction of the stressed sliding core, a number of installation holes are opened on the side wall of the force transmission frame, power transmission balls are installed in the installation holes, and the force transmission frame drives the stressed sliding core to rotate;

The tripping groove ring, the side wall of the tripping groove ring is provided with several inner hole grooves, the power transmission ball is located in the inner hole groove, the power transmission ball drives the force transmission frame and the tripping groove ring to rotate synchronously, the tripping groove ring is fixedly connected with the handle, and after reaching the torque of the screwdriver, the power transmission ball is switched to the adjacent inner hole groove;

A bearing ball, the outer wall of the force transmission ball is in contact with the outer wall of the bearing ball, and the bearing ball is located in the force transmission frame;

The elastic member is used for returning the force transmission frame after the outer wall of the stressed sliding core slides.

By adopting the above-mentioned technical scheme, the worker inserts the knife rod and the end of the screw rod, twists the knife handle, drives the trip groove ring to rotate, drives the force transmission frame to rotate under the limit of the force transmission ball, and the force transmission frame drives the force sliding core to rotate, thereby achieving the effect of tightening the screw rod. When the screwdriver does not reach the specified torque, the tool shaft will transmit the torque to the screw with the rotation of the handle; when the screw reaches the specified torque, the power transmission ball will climb out of the inner hole groove and move towards the center of the tool bar under the action of the lateral component force. Under the action of the bearing ball, the elastic member will be compressed towards the tip of the tool bar. During the process of continuing to rotate the handle, the power transmission ball will fall into the adjacent inner hole groove. The setting of the power transmission ball is convenient for the staff during the process of tightening the screw. When the screw is screwed to the specified torque, the power transmission ball rolls out of the inner hole groove where it is located, and continues to turn the handle to tighten the screw, reducing the reverse torque generated when the screwdriver tightens the screw, reducing the deviation of the torque when tightening the screw, thereby improving the accuracy of the screwdriver.

Optionally, a U-shaped groove is formed on the outer wall of the stressed sliding core, sliding core balls roll on the inner wall of the U-shaped groove, and a waist-shaped groove is opened on the inner wall of the force transmission frame, and the sliding core ball rolls in the waist-shaped groove.

By adopting the above technical scheme, during the process of turning the tool handle, the setting of the sliding core balls makes the force sliding core and the force transmission frame rotate synchronously. When the set torque is reached, the tool handle continues to be rotated, and the force transmission ball breaks away from the inner hole groove. At this time, under the support of the bearing ball, the force transmission frame slides along the length direction of the force transmission core.

Optionally, a limiting groove is provided on the inner wall of the knife handle, and several positioning grooves are provided on the inner wall of the limiting groove, and several positioning blocks are fixed on the outer wall of the tripping groove ring, the tripping groove ring is located in the limiting groove, the positioning blocks and the positioning grooves are set in one-to-one correspondence, and the tripping groove ring is located at the end of the force transmission frame away from the tip of the knife rod.

By adopting the above technical scheme, the staff inserts the tripping groove ring from the opening of the handle, so that the tripping groove ring slides into the limiting groove, and the positioning block is correspondingly snapped into the positioning groove, and the cooperation between the positioning block and the positioning groove limits the relative rotation of the tripping groove ring and the handle, so that the worker drives the tripping groove ring to rotate in the process of rotating the handle. The opening of the limiting groove limits the slippage of the tripping groove ring along the length direction of the tool handle; the opening of the limiting groove makes the tripping groove ring limited to the outer wall of the force transmission frame away from the tip of the knife rod.

Optionally, an adjusting bolt is sheathed on the outer wall of the knife rod, and a small scale nut is threadedly connected to the outer wall of the adjusting bolt. A positioning ring is arranged on the side wall of the adjusting bolt and the small scale nut. The end of the elastic member away from the abutting ball abuts against the side wall of the positioning ring. A limiting assembly for limiting the rotation of the adjusting bolt and the small scale nut is provided on the outer wall of the handle.

By adopting the above technical scheme, when the worker needs to adjust the torque of the screwdriver, he turns the small scale nut, and the small scale nut slides on the outer wall of the adjusting bolt, driving the positioning ring to move. The compression degree of the elastic part changes under the drive of the positioning ring, and the force on the side wall of the force transmission frame under the support of the elastic part changes, so that the torque corresponding to the power transmission ball breaking away from the inner hole groove changes. The stability of the knife is better.

Optionally, a clamping hole is opened through the side wall of the small scale nut, and the limit assembly includes a locking lining that can rotate on the outer wall of the small scale nut; a sliding groove is provided on the inner wall of the locking lining, and a counterbore is opened on the inner wall of the locking lining, and the sliding groove is connected with the counterbore, and the depth of the counterbore is greater than the depth of the sliding groove; the limiting assembly also includes a locking ball located in the installation hole; The position block, the position limiting assembly also includes a locking ring rotatable on the outer wall of the locking lining, a locking groove is formed on the inner wall of the locking ring, and the limiting block is snapped into the locking groove.

By adopting the above technical scheme, when the torque of the screwdriver needs to be adjusted, the worker turns the locking ring along the direction from the sliding groove to the counterbore, and the locking ring drives the locking inner lining to rotate, and the locking ring drives the locking ball to slide into the counterbore, so that the distance between the locking ball and the outer wall of the adjusting bolt increases, and the staff can adjust the torque of the screwdriver by turning the small scale nut at this time; when the screwdriver torque is adjusted to limit the rotation of the small scale nut, the locking ring is rotated along the direction from the counterbore to the sliding groove, and the locking ball goes from the counterbore to the sliding groove. The counterbore slides into the sliding groove, so that the outer wall of the locking ball abuts against the outer wall of the adjusting bolt, which has the effect of restricting the rotation of the small scale nut, so that the stability of the screwdriver is better when the screw is tightened.

Optionally, a thrust bearing is provided at one end of the adjusting bolt facing the elastic member, the side wall of the positioning ring is fixedly connected to the outer wall of the thrust bearing, and the elastic member is fixedly connected to the outer wall of the thrust bearing.

By adopting the above technical solution, the adjusting bolt and the elastic member are separated by a thrust bearing, which reduces the friction between the positioning ring and the elastic member during the process of adjusting the torque of the screwdriver, thereby making it easier to adjust the torque and compress the elastic member.

Optionally, an initial adjustment screw is threaded on the inner wall of the knife handle, a set screw is threaded on the inner wall of the knife handle, a reinforced square tenon is riveted on the inner wall of the knife handle, and the outer wall of the reinforced square tenon abuts against the outer wall of the set screw.

By adopting the above-mentioned technical scheme, during the process of assembling the screwdriver, the worker loads the parts in the handle from the opening on the handle near the end of the initial adjustment screw, and finally installs the release groove ring and the bearing ball, tightens the initial adjustment bolt in the handle, and then tightens the set screw in the handle. The setting of the initial adjustment screw limits the parts in the handle, and the setting of the tightening screw limits the position of the initial adjustment screw, reducing the possibility of loosening of the initial adjustment screw. The setting of the square mortise with force limits the positioning of the tightening screw, so that the assembled screwdriver is more compact and reduces the possibility of loosening.

Optionally, the opening of the knife handle is threadedly connected with a back cover, a guide groove is opened on the outer wall of the force square tenon, a positioning pin is fixed on the outer wall of the back cover, and the end of the positioning pin slides into the guide groove.

By adopting the above technical scheme, the setting of the positioning pin fixes the back cover on the force square tenon, and the back cover is synchronously fixed on the knife handle while the set screw is tightened; and during the process of tightening the set screw, the positioning pin slides on the inner wall of the guide groove, which is convenient for the staff to tighten the back cover.

In summary, the present application includes at least one of the following beneficial technical effects:

1. In the process of tightening the screw, the staff inserts the end of the knife rod to the screw rod, turns the handle, and the handle drives the trip groove ring to rotate, drives the force transmission frame to rotate, the force transmission frame drives the force sliding core to rotate, drives the knife rod to rotate, and then tightens the screw rod. When the screwdriver reaches the specified torque, the power transmission ball climbs out of the inner hole groove under the action of the lateral component force, and continues to turn the handle. The power transmission ball falls into the adjacent inner hole groove. The setting of the power transmission ball reduces the reverse torque generated during the process of tightening the screw, reduces the deviation of the torque when tightening the screw, and improves the accuracy of the screwdriver.

2. The setting of the setting screw limits the position of the initial adjustment screw, reducing the possibility of loosening of the initial adjustment screw. During the process of tightening the setting screw through the force square tenon, the staff sets the back cover on the opening of the handle under the limitation of the positioning pin. The setting of the force square tenon limits the position of the set screw, reducing the possibility of the set screw loosening.

3. The opening of the limit groove limits the slippage of the tripping groove ring in the tool handle, and under the limit, the tripping groove ring is fixed to the end of the force transmission frame, which increases the power arm of the screwdriver, so that the staff can save more effort in the process of tightening the screw with the same torque.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a screwdriver in an embodiment of the present application.

Fig. 2 is a cross-sectional view of the screwdriver in the embodiment of the present application.

Fig. 3 is an enlarged view of A in Fig. 2 .

Fig. 4 is a cross-sectional view of the screwdriver in the embodiment of the present application, used to show the state of the locking ball when the small scale nut is locked.

Fig. 5 is a schematic structural view of the locking ring in the embodiment of the present application, which is used to show the connection between the locking lining and the inner wall of the locking ring.

Reference signs: 1, knife handle; 2, knife bar; 3, force sliding core; 4, force transmission frame; 5, installation hole; 6, force transmission ball; 7, trip groove ring; 8, inner hole groove; 9, bearing ball; 10, elastic member; 11, U-shaped groove; ; 20, limit assembly; 21, clamping hole; 22, locking lining; 23, sliding groove; 24, counterbore; 25, locking ball; 26, limit block; 27, locking ring; 29, thrust bearing; 30, initial adjustment screw;

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-5.

The embodiment of the present application discloses a torque screwdriver without reverse torque.

With reference to Fig. 1, a kind of torsion screwdriver without reverse moment comprises a knife handle 1, and the knife handle 1 is hollowly arranged, and both ends of the knife handle 1 are connected with the outside world, and the screwdriver also includes an adjusting bolt 17 coaxially fixed with the knife handle 1 and a knife bar 2 coaxially fixed on the inner wall of the adjusting bolt 17, and the cutter head of the knife bar 2 is positioned outside the adjusting bolt 17. Before tightening the screw rod, the staff inserts the end of the knife rod 2 into the tightening head of the screw rod in advance, and by turning the handle of a knife 1, the adjusting bolt 17 is driven to rotate, which drives the rotation of the knife rod 2, thereby turning the screw rod.

With reference to Fig. 2, on the outer wall of cutter bar 2 coaxially is provided with stressed sliding core 3, and the outer wall of cutter bar 2 and stressed sliding core 3 is provided with connecting hole, and connecting hole is opened along the diameter direction of cutter bar 2 and stressed sliding core 3, and connecting pin 36 is pierced in the connecting hole, under the limit of connecting pin 36, stressed sliding core 3 is fixed on the outer wall of cutter bar 2, and stressed sliding core 3 is positioned at the end of cutter bar 2 away from the cutter head, and stressed sliding core 3 is positioned in handle 1. When the worker rotates the tool handle 1, the force-bearing sliding core 3 is driven to rotate, and the tool bar 2 is driven to rotate under the limit of the connecting pin 36 .

Referring to Fig. 2 and Fig. 3, several U-shaped grooves 11 are evenly spaced on the outer wall of the stressed sliding core 3, and the U-shaped grooves 11 are opened along the length direction of the stressed sliding core 3. In the present application, three U-shaped grooves 11 are preferentially provided. 3. In the present application, there are preferably three waist-shaped grooves 13, and the three waist-shaped grooves 13 are evenly distributed on the inner wall of the force transmission frame 4. The waist-shaped groove 13 is connected to the outside world toward the end of the cutter head 2, and the force transmission frame 4 is rotated so that the waist-shaped grooves 13 and the U-shaped grooves 11 are set in one-to-one correspondence. The sliding core balls 12 are loaded from the openings of the waist-shaped grooves 13 and U-shaped grooves 11. The distance between the bottom wall of 13 and the bottom wall of the U-shaped groove 11 is equal to the diameter of the sliding core ball 12. Under the limit of the sliding core ball 12, the force transmission frame 4 is coaxially fixed on the outer wall of the stressed sliding core 3.

With reference to Fig. 2 and Fig. 3, limit hole is provided on the side wall of force transmission frame 4, and limit hole is preferentially provided with two in the present application, and limit hole and connection hole are correspondingly arranged, and the end of connecting pin 36 is plugged in limit hole, and connection pin 36 is matched with limit hole gap, and connection pin 36 limits the relative rotation of force transmission frame 4 and force sliding core 3, so that the staff rotates the process of knife handle 1 to drive force force sliding core 3 and force transmission frame 4 to rotate together; The inner wall of the force transmission frame 4 is supported to reduce the friction between the force transmission frame 4 and the outer wall of the force-bearing sliding core 3, and the sliding core ball 12 has a tendency to roll in the waist-shaped groove 13 and the U-shaped groove 11 during the rotation process of the force transmission frame 4 and the force-bearing sliding core 3 driven by the knife handle 1, thereby reducing the torque generated during the process of tightening the screw by the screwdriver and improving the accuracy of the screwdriver.

Referring to Fig. 2, the outer wall of the force transmission frame 4 is evenly spaced with several installation holes 5. In this application, three installation holes 5 are preferentially provided, and the force transmission balls 6 are installed in the three installation holes 5; The force transmission ball 6 is tangent to the bottom wall of the corresponding inner hole groove 8; the force transmission frame 4 is abutted with a load bearing ball 9 on the inner wall of the end of the cutter head away from the cutter bar 2, and the outer wall of the force transmission ball 6 is in contact with the outer wall of the load bearing ball 9. During the process of rotating the tripping groove ring 7, the force transmission frame 4 is driven by the force transmission ball 6 to rotate.

Referring to Fig. 2 , a limiting groove 14 is provided on the inner wall of the handle 1, and the inner wall of the limiting groove 14 is in a coaxial state with the handle 1. Several positioning grooves 15 are evenly spaced on the inner wall of the limiting groove 14. In this application, three positioning grooves 15 are preferentially provided, and the three positioning grooves 15 are all located at the edge of the inner wall of the limiting groove 14; on the outer wall of the tripping groove ring 7, there are several positioning blocks 16 uniformly spaced and integrally fixed, and the positioning blocks 16 correspond to the positioning grooves 15. Setting; the inner wall of the handle 1 is threaded with an initial adjustment screw 30, the outer wall of the initial adjustment screw 30 abuts against the side wall of the tripping groove ring 7, under the limit of the initial adjustment screw 30, the tripping groove ring 7 is fixed in the limit groove 14, and the bearing ball 9 is limited between the force transmission frame 4 and the initial adjustment screw 30, so that the load bearing ball 9 is located between the opening edge of the force transmission frame 4 and the initial adjustment screw 30.

Referring to Fig. 2, the inner wall of the knife handle 1 is threaded with a set screw 31. After the worker tightens the initial adjustment screw 30, the set screw 31 is installed in the inner cavity of the handle 1. The outer wall of the set screw 31 abuts against the outer wall of the initial adjustment screw 30. The setting of the set screw 31 limits the initial adjustment screw 30, reducing the possibility of the initial adjustment screw 30 becoming loose. The inner wall of the knife handle 1 is evenly spaced with several clamping grooves. In the present application, three clamping grooves are preferentially provided. The inner wall of the knife handle 1 is clamped and fixed with a force square tenon 32. The side of the force square tenon 32 facing the inner cavity of the knife handle 1 abuts against the outer wall of the fastening screw 31. On the outer wall of the force square tenon 32, three clamping blocks are uniformly spaced and integrally fixed. The fixing of power square tenon 32. The setting of the reinforcing square mortise 32 limits the set screw 31, reducing the possibility of the set screw 31 loosening.

With reference to Fig. 2, on the outer wall of adding force square tenon 32, be provided with guide groove 34, and guide groove 34 is opened along the circumferential direction of force adding square tenon 32, and guide groove 34 is coaxially arranged with adding force square tenon 32; In the groove 34, the back cover 33 is threadedly connected to the inner wall of the knife handle 1. When the personnel rotates the back cover 33, the end of the positioning pin 35 slides in the guide groove 34. The setting of the positioning pin 35 plays a position-limiting effect on the back cover 33 on the one hand, reduces the possibility that the back cover 33 is separated from the knife handle 1, and reduces the interference caused to the rotation of the back cover 33 on the other hand.

With reference to Fig. 2, the outer wall of adjusting bolt 17 is threaded with small scale nut 18, all has scale on the outer wall of small scale nut 18 and adjusting bolt 17, the end of adjusting bolt 17 is provided with the elastic member 10 that is used to adjust screwdriver torque, elastic member 10 preferably selects spring among the present application. A thrust bearing 29 is installed coaxially on the outer wall of one end of the adjustment bolt 17 towards the inner cavity of the handle 1 , and a positioning ring 19 is coaxially sleeved on the outer wall of the adjustment bolt 17 . The worker rotates the small scale nut 18 so that the elastic member 10 is compressed, and the abutment of the elastic member 10 makes the abutment between the power transmission ball 6 and the outer wall of the bearing ball 9 tighter, thereby completing the adjustment of the screwdriver torque.

Referring to FIG. 2 , the outer wall of the small scale nut 18 is provided with a limiting assembly 20 for limiting the rotation of the small scale nut 18 . The outer wall of the small scale nut 18 is provided with several clamping holes 21 evenly spaced. In this application, two clamping holes 21 are preferentially provided. The two clamping holes 21 are opened symmetrically along the diameter of the small scale nut 18. The limit assembly 20 includes a locking lining 22 sleeved on the outer wall of the small scale nut 18. The locking lining 22 is composed of two semicircular rings connected by connecting rods. Referring to FIG. 4 , the inner wall of the locking lining 22 is evenly spaced. 23. The length direction of the sliding groove 23 is arranged along the circumferential direction of the locking lining 22. Two sliding grooves 23 are provided preferentially. The inner wall of the locking lining 22 is provided with a counterbore 24. The counterbore 24 and the sliding groove 23 are provided in one-to-one correspondence. The counterbore 24 communicates with the sliding groove 23. The depth of the counterbore 24 is greater than the depth of the sliding groove 23. In the shift groove 23, in the process of rotating the locking lining 22, when the locking ball 25 is located in the sliding groove 23, the outer wall of the locking ball 25 abuts against the outer wall of the adjusting nut to limit the rotation of the small scale nut 18;

With reference to Fig. 5, on the outer wall of locking lining 22, several spacer blocks 26 are welded and fixed at even intervals. In this application, four limiting blocks 26 are preferably arranged; Referring to FIG. 1 , the end of the knife handle 1 near the cutter head of the knife bar 2 is fixed to the outer wall of the adjusting bolt 17 by screws, so that the fixing of the knife handle 1 and the adjusting bolt 17 is more stable.

The implementation principle of a torque screwdriver without reverse torque in the embodiment of the present application is as follows: before tightening the screw rod, first adjust the torque of the screwdriver according to the demand, turn the locking ring 27 to drive the locking inner lining 22 to rotate, so that the locking ball 25 slides into the counterbore 24, at this time, turn the small scale nut 18 to adjust the compression degree of the elastic member 10, so that the degree of tightness between the force transmission ball 6 and the outer wall of the bearing ball 9 changes, thereby realizing the adjustment of the screwdriver torque;

Turn the locking ring 27 to drive the locking inner lining 22 to rotate, drive the locking ball 25 to roll into the sliding groove 23, and the pressing ball abuts against the outer wall of the adjusting bolt 17 to limit the rotation of the small scale bolt and reduce the possibility of self-rotation;

Turn the handle of a knife 1, the handle of a knife 1 drives the trip groove ring 7 to rotate, and drives the force transmission frame 4 to rotate under the limit of the force transmission ball 6, and the force sliding core 3 rotates synchronously, drives the knife bar 2 to rotate, and plays the effect of tightening the screw rod. When the set torque is reached, the power transmission ball 6 climbs out of the inner hole groove 8 under the action of the lateral component force, and continues to rotate the handle 1, the power transmission ball 6 slides into the adjacent inner hole groove 8, and the screw has been tightened within the specified torque.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (8)

1. The utility model provides a torque screwdriver of no reverse moment, includes handle of a knife (1) and one end setting are in cutter arbor (2) in handle of a knife (1) inner chamber, its characterized in that: and also comprises

The stress sliding core (3) is fixedly connected with the cutter bar (2);

the force transmission frame (4) is sleeved on the outer wall of the force-bearing sliding core (3), the force transmission frame (4) can slide along the length direction of the force-bearing sliding core (3), a plurality of mounting holes (5) are formed in the side wall of the force transmission frame (4), force transmission balls (6) are mounted in the mounting holes (5), and the force transmission frame (4) drives the force-bearing sliding core (3) to rotate;

the device comprises a tripping groove ring (7), wherein a plurality of inner hole grooves (8) are formed in the side wall of the tripping groove ring (7), a force transmission ball (6) is positioned in the inner hole grooves (8), the force transmission ball (6) drives the force transmission frame (4) to rotate synchronously with the tripping groove ring (7), the tripping groove ring (7) is fixedly connected with the tool handle (1), and after the torque of a screwdriver is reached, the force transmission ball (6) is switched into the adjacent inner hole grooves (8);

the bearing ball (9), the outer wall of the force transmission ball (6) is connected with the outer wall of the bearing ball (9), and the bearing ball (9) is positioned in the force transmission frame (4);

and the elastic piece (10) is used for enabling the force transmission frame (4) to return after the outer wall of the stressed sliding core (3) slides.

2. The torque driver without reverse torque of claim 1, wherein: u-shaped grooves (11) are formed in the outer wall of the stressed sliding core (3), sliding core balls (12) roll on the inner wall of the U-shaped grooves (11), waist-shaped grooves (13) are formed in the inner wall of the force transmission frame (4), and the sliding core balls (12) roll in the waist-shaped grooves (13).

3. The torque driver without reverse torque of claim 1, wherein: the utility model discloses a knife handle, including handle of a knife (1), the inner wall of handle of a knife (1) is seted up spacing groove (14), a plurality of constant head tank (15) have been seted up on the inner wall of spacing groove (14), be fixed with a plurality of locating piece (16) on the outer wall of tripping groove circle (7), tripping groove circle (7) are located in spacing groove (14), locating piece (16) with constant head tank (15) are the one-to-one setting, tripping groove circle (7) are located pass power frame (4) are kept away from the one end of cutter arbor (2) pointed end.

4. A torque driver without back torque as defined in claim 3, wherein: the utility model discloses a cutter arbor, including cutter arbor (2), cutter arbor (1), adjusting bolt (17) are equipped with on the outer wall of cutter arbor (2), threaded connection has little scale nut (18) on adjusting bolt (17) the lateral wall of little scale nut (18) is provided with retainer plate (19), elastic component (10) are kept away from the one end of butt ball with the lateral wall butt of retainer plate (19), be provided with on the outer wall of handle of a knife (1) and be used for the restriction adjusting bolt (17) with little scale nut (18) pivoted spacing subassembly (20).

5. The torque-free screwdriver of claim 4, wherein: a clamping hole (21) is formed in the side wall of the small-scale nut (18) in a penetrating mode, and the limiting assembly (20) comprises a locking lining (22) which can rotate on the outer wall of the small-scale nut (18); a sliding groove (23) is formed in the inner wall of the locking lining (22), a counter bore (24) is formed in the inner wall of the locking lining (22), the sliding groove (23) is communicated with the counter bore (24), the depth of the counter bore (24) is larger than that of the sliding groove (23), and the limiting assembly (20) further comprises a locking ball (25) located in the mounting hole (5); a limiting block (26) is fixed on the outer wall of the locking lining (22), the limiting component (20) further comprises a locking ring (27) which can rotate on the outer wall of the locking lining (22), a locking groove is formed in the inner wall of the locking ring (27), and the limiting block (26) is clamped in the locking groove.

6. The torque-free screwdriver of claim 5, wherein: the adjusting bolt (17) is provided with a thrust bearing (29) towards one end of the elastic piece (10), the side wall of the positioning ring (19) is fixedly connected with the outer wall of the thrust bearing (29), and the elastic piece (10) is fixedly connected with the outer wall of the thrust bearing (29).

7. The torque driver without reverse torque of claim 1, wherein: the novel tool is characterized in that a primary adjusting screw (30) is connected to the inner wall of the tool handle (1) in a threaded manner, a binding screw (31) is connected to the inner wall of the tool handle (1) in a threaded manner, a reinforcing square tenon (32) is riveted to the inner wall of the tool handle (1), and the outer wall of the reinforcing square tenon (32) is abutted to the outer wall of the binding screw (31).

8. The torque-free screwdriver of claim 7, wherein: the novel tool is characterized in that a rear cover (33) is connected to the opening of the tool handle (1) in a threaded mode, a guide groove (34) is formed in the outer wall of the boosting square tenon (32), a positioning pin (35) is fixed on the outer wall of the rear cover (33), and the end portion of the positioning pin (35) slides into the guide groove (34).