CN113594970A

CN113594970A - Handheld threading device

Info

Publication number: CN113594970A
Application number: CN202110861645.4A
Authority: CN
Inventors: 梁金刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-11-02

Abstract

A handheld threading device comprises a shell, a power belt, a reversing mechanism, a transmission bevel gear A, an interval adjusting mechanism, a threading mechanism, a power motor, a switch, a battery and a power output belt wheel; the shell can prevent the internal parts of the device from being polluted and can also protect a user from being mechanically injured by the device; the belt transmits the power generated by the power motor to the reversing mechanism; by changing the position of the reversing handle, the reversing teeth can be contacted with different contact gears, and the rotating direction of the transmission bevel gear is changed; the transmission bevel gear transmits the power transmitted by the reversing mechanism forwards after decelerating; the connecting rod is driven to deviate by adjusting the spacing adjusting mechanism, so that the two friction wheels are in contact with the cable and generate certain pressure; the friction wheel rotates and simultaneously drives the cable penetrating through the guide pipe to move, so that the purpose of threading is realized; the portable multifunctional desk is simple in structure, easy to carry and convenient to operate, and can provide convenience for workers in related fields.

Description

Handheld threading device

Technical Field

The invention relates to the technical field of electrical engineering cable threading devices, in particular to a handheld threading device for an electrical engineering cable.

Background

In recent years, along with the increasing expansion of building scale, the length and the number of electric wires inside a building are multiplied, and more cables need to be manually penetrated into a threading pipe reserved in the building; because the cable length is longer, and threading intraductal space is limited, makes workman's work load constantly increase, and efficiency constantly descends, consequently, needs a structure small and exquisite, conveniently carries, operates efficient threading instrument.

Disclosure of Invention

The invention provides a handheld threading device aiming at the technical problem, which is characterized in that: comprises a shell, a power belt, a reversing mechanism, a transmission bevel gear A, an interval adjusting mechanism, a threading mechanism, a power motor, a switch, a battery and a power output belt wheel; the shell is fixedly arranged on the periphery of the device; the power belt is fixedly arranged on a driven belt wheel on the excircle of the threading shaft tube; the other end is rotationally connected with a power output belt wheel; the reversing mechanism is fixedly arranged in the shell; the threading mechanism is fixedly arranged on the front end surface of the reversing mechanism; the gear mounting plate is fixedly arranged on the reversing frame; the transmission bevel gear A is rotatably arranged on the gear mounting plate; the transmission bevel gear B is meshed with the transmission bevel gear A; the sliding mounting plate of the spacing adjusting mechanism is fixedly arranged on the vertical plate of the guide pipe; and the shaft hole on the adjusting rack of the spacing adjusting mechanism is connected with the slotted hole on the connecting rod B in a sliding way; the power motor is fixedly arranged on the lower surface of a reversing frame of the reversing mechanism; a motor shaft of the power motor is fixedly installed with a power output belt wheel; the power of the power motor can be transmitted to the reversing mechanism by a belt wheel group consisting of a power belt and a power output belt wheel; the battery is fixedly arranged on the lower surface of the power motor; the battery provides power for the device and serves as an energy source; the switch is slidably mounted in the opening of the housing.

Further, the reversing mechanism includes: the reversing mechanism comprises a reversing frame, a contact gear A, a reversing handle, a reversing tooth, a contact gear B, a transmission bevel gear B, a threading shaft tube, a gear shaft and a transmission gear C;

the transmission bevel gear B is rotatably arranged in a circular hole on the side surface of the reversing frame; the threading shaft tube is coaxial with the transmission bevel gear B; the transmission bevel gear B and the threading shaft tube are fixedly arranged; the threading shaft tube penetrates through a round hole at the other side of the reversing frame and is rotatably installed with the reversing frame; the contact gear A is fixedly arranged on the threading shaft tube and rotates along with the rotation of the threading shaft tube; simultaneously, the contact gear A is meshed with a transmission gear C; four transmission gears C are respectively and fixedly arranged on the gear shaft; the two gear shafts are rotatably arranged in the openings at the two sides of the reversing frame; and the two transmission gears C at the middle part are mutually meshed; the contact gear B is fixedly arranged on the transmission bevel gear B; simultaneously, the contact gear B is meshed with a transmission gear C; the reversing handle is slidably arranged in a slotted hole on the upper end surface of the reversing frame; the reversing handle and the reversing teeth are rotatably arranged; the reversing gear is slidably arranged on the transmission bevel gear B; and the round hole on the reversing tooth is slidably mounted with the slotted hole of the transmission bevel gear B; the reversing handle can drive the reversing teeth to slide on the transmission bevel gear B; and the reversing teeth can contact with the gear B or the transmission bevel gear B, so that the transmission bevel gear B is driven to rotate, and the direction of the transmission bevel gear B is consistent with the rotating direction of the reversing teeth.

Further, the spacing adjustment mechanism includes: the device comprises a sliding mounting plate, an adjusting gear, an adjusting belt, an adjusting knob and an adjusting rack;

the sliding mounting plate is fixedly arranged on the vertical plate of the guide pipe; the adjusting gear is rotatably arranged in a rotating hole in the middle of the sliding mounting plate; the adjusting knob is rotatably arranged in the mounting hole at the corner of the sliding mounting plate; the adjusting belt is arranged at the adjusting gear and a belt wheel of the adjusting belt; pin holes at two ends of the adjusting rack are slidably arranged in the slotted holes of the sliding mounting plate; the adjusting rack is meshed with a gear at the lower end of the adjusting gear; the adjusting rack shaft hole is connected with the connecting rod B in a sliding way.

Furthermore, the upper end of the adjusting knob is provided with a round-handle-shaped adjusting wheel, and the adjusting wheel is provided with rubber teeth to prevent the hand from slipping in the knob process.

Further, the threading mechanism includes: the device comprises a gear mounting plate, a guide pipe, a friction wheel, a connecting rod A, a connecting rod B, a connecting rod C, a belt A, a transmission belt wheel A, a belt B, a transmission gear D and a connecting rod D;

the gear mounting plate is fixedly arranged on the side surface of the reversing frame; the guide pipe is fixedly installed with the gear installation plate; the transmission gear D is rotatably arranged in a rotating hole on the gear mounting plate, and the connecting rod D is arranged at the lower part of a power output belt wheel of the reversing mechanism and is rotatably connected with the transmission gear D; the transmission belt wheel A is movably arranged in a rotating hole at the other end of the connecting rod D; the belt B is arranged on the transmission gear D and the transmission belt wheel A; one end of the connecting rod C is rotatably arranged on the upper end surface of the transmission belt wheel A; the other end of the connecting rod C is rotationally connected with the friction wheel rotating shaft; the belt A is arranged on a friction wheel and a synchronous wheel of the transmission belt wheel A, so that the friction wheel and the transmission belt wheel A rotate synchronously; the connecting rod B is rotatably arranged on the support of the guide pipe; two ends of the connecting rod A are rotatably installed with the two connecting rods B at the same time; thereby leading the guide tube, the connecting rod B and the connecting rod A to form a parallelogram mechanism; the friction wheel is rotatably arranged in a rotating hole in the middle of the connecting rod A.

Further, the side of the friction wheel is provided with an arc-shaped rubber outer ring.

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

(1) the invention has the advantages of 203mm of total length, lightness, convenience and portability;

(2) the invention adopts the reversing mechanism which is directly connected with the friction wheel, therefore, the invention can feed the wire into the threading pipe and pull out the cable from the threading pipe;

(3) the invention adopts the knob and the gear and rack adjusting device, can manually adjust the clearance of the friction wheel and is suitable for cables with different diameters; and when the friction wheel slips, the pretightening force of the friction wheel can be directly increased through the knob.

Drawings

Fig. 1, fig. 2, fig. 3 and fig. 4 are schematic overall structural diagrams of the present invention.

Fig. 5 is a sectional view showing the overall structure of the present invention.

Fig. 6 and 7 are schematic diagrams of the reversing mechanism.

Fig. 8 and 9 are schematic diagrams of the distance adjustment.

Fig. 10 and 11 are schematic views of the threading mechanism.

Reference numerals:

1-a housing; 2-a power belt; 3-a reversing mechanism; 4-transmission bevel gear A; 5-a spacing adjustment mechanism; 6-a threading mechanism; 7-a power motor; 8-a switch; 9-a battery; 10-a power take-off pulley; 301-a reversing frame; 302-contact gear a; 303-a reversing handle; 304-a commutation tooth; 305-contact gear B; 306-transmission bevel gear B; 307-threading shaft tube; 308-gear shaft; 309-drive gear C; 501-a sliding mounting plate; 502-adjusting gear; 503-adjusting the belt; 504-adjusting knob; 505-adjusting rack; 601-a gear mounting plate; 602-a guide tube; 603-a friction wheel; 604-link A; 605-link B; 606-Link C; 607-Belt A; 608-drive pulley a; 609-belt B; 610-drive gear D; 611-link D.

Detailed Description

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. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the invention.

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.

Embodiment example as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, a hand-held threading device comprises a housing 1, a power belt 2, a reversing mechanism 3, a transmission umbrella tooth a4, a spacing adjusting mechanism 5, a threading mechanism 6, a power motor 7, a switch 8, a battery 9 and a power output belt wheel 10; the shell 1 is fixedly arranged on the periphery of the device; the shell 1 can prevent the internal parts of the device from being polluted and can also protect a user from being mechanically injured by the device; the power belt 2 is fixedly arranged on a driven belt wheel at the excircle of the threading shaft tube 307; the other end is rotationally connected with a power output belt wheel 10; the power generated by the power motor 7 is transmitted to the reversing mechanism 3; the reversing mechanism 3 is fixedly arranged in the shell 1; by changing the position of the reversing handle 303, the reversing tooth 304 can be contacted with different contact gears, and the rotating direction of the transmission bevel gear B306 is changed; the threading mechanism 6 is fixedly arranged on the front end surface of the reversing mechanism 3; the gear mounting plate 601 is fixedly mounted on the reversing frame 301; the transmission bevel gear A4 is rotatably arranged on the gear mounting plate 601; the transmission bevel B306 is meshed with the transmission bevel A4; the transmission bevel gear A4 transmits the power transmitted by the reversing mechanism 3 forwards after decelerating; the sliding installation plate 501 of the spacing adjustment mechanism 5 is fixedly installed on the vertical plate of the guide pipe 602; and the shaft hole on the adjusting rack 505 of the spacing adjusting mechanism 5 is connected with the slotted hole on the connecting rod B605 in a sliding way; the distance adjusting mechanism 5 can drive the threading mechanism 6 to change the distance between the threading mechanisms 6 of the shell 014, so as to adapt to different cables; the power motor 7 is fixedly arranged on the lower surface of the reversing frame 301 of the reversing mechanism 3; and a motor shaft of the power motor 7 is fixedly installed with the power output belt wheel 10; the power of the power motor 7 can be transmitted to the reversing mechanism 3 by a belt wheel group consisting of a power belt 2 and a power output belt wheel 10; the battery 9 is fixedly arranged on the lower surface of the power motor 7; the battery 9 provides power for the device as an energy source; the switch 8 is slidably mounted in an opening of the housing 1; the power supply of the device is controlled to be switched on and off through the relative sliding position of the switch 8;

in an alternative embodiment of the present invention, as shown in fig. 6, the reversing mechanism 3 includes: the reversing frame 301, the contact gear A302, the reversing handle 303, the reversing tooth 304, the contact gear B305, the transmission bevel gear B306, the threading shaft tube 307, the gear shaft 308 and the transmission gear C309; the transmission bevel gear B306 is rotatably arranged in a circular hole on the side surface of the reversing frame 301; the threading shaft tube 307 is coaxial with the transmission bevel gear B306; the transmission bevel gear B306 and the threading shaft tube 307 are fixedly arranged; the threading shaft tube 307 penetrates through a round hole at the other side of the reversing frame 301, and the threading shaft tube 307 and the reversing frame 301 are rotatably installed; contact gear a302 is fixedly mounted on threading shaft tube 307 and rotates with threading shaft tube 307; while the contact gear a302 meshes with a transfer gear C309; four transmission gears C309 are respectively and fixedly arranged on the gear shaft 308; two gear shafts 308 are rotatably mounted in the openings at the two sides of the reversing frame 301; and the two transmission gears C309 at the middle part are mutually meshed; the contact gear B305 is fixedly arranged on the transmission bevel gear B306; while the contact gear B305 is engaged with a transfer gear C309; the reversing handle 303 is slidably mounted in a slotted hole on the upper end surface of the reversing frame 301; the reversing handle 303 and the reversing teeth 304 are rotatably arranged; the reversing gear 304 is slidably mounted on the transmission bevel gear B306; and the round hole on the reversing tooth 304 is slidably mounted with the slotted hole of the transmission bevel gear B306; the reversing handle 303 can drive the reversing teeth 304 to slide on the transmission bevel gear B306; the reversing tooth 304 can contact with the gear B305 or the transmission bevel gear B306, so that the transmission bevel gear B306 is driven to rotate, and the direction is consistent with the rotating direction of the reversing tooth 304; the power belt 2 and the power output belt wheel 10 transmit the power of the power motor 7 to the threading shaft tube 307; the threading shaft tube 307 drives the contact gear A302 to rotate; the contact gear A302 is meshed with the transmission gear C309 to drive the contact gear A302 and the gear shaft 308 to rotate; since the two transmission gears C309 in the middle are meshed, all the gear shafts 308 and the transmission gears C309 rotate as the contact gear a302 rotates; since the contact gear B305 is meshed with the transmission gear C309, the contact gear B305 rotates synchronously, but the rotation direction of the contact gear B305 is opposite to that of the contact gear A302; the upper part of the reversing handle 303 is a push handle, the lower part of the reversing handle is coaxial with the reversing teeth 304, the reversing teeth 304 are fastened, and the reversing teeth 304 can only slide under the action of the reversing handle 303; the mounting hole on the reversing tooth 304 is slidably mounted on the slot hole on the side surface of the transmission bevel gear B306; the reversing teeth 304 can slide along the slotted holes, and meanwhile, the reversing teeth 304 rotate to drive the transmission bevel gear B306 to rotate; when the reversing handle 303 is pushed to push the handle, the reversing handle 303 drives the reversing tooth 304 to slide along the transmission bevel gear B306, and in the limit position, the reversing tooth 304 is contacted with the contact gear A302 or the contact gear B305 and rotates under the driving of the contact gear A302 or the contact gear B305; thereby driving the transmission bevel gear B306 to rotate, and the rotating direction is the same as the direction of the part contacted with the reversing gear 304, so that the reversing mechanism 3 completes the power output and reversing functions of the power motor 7;

in an alternative embodiment of the present invention, as shown in fig. 8, the spacing adjustment mechanism 5 includes: a sliding mounting plate 501, an adjusting gear 502, an adjusting belt 503, an adjusting knob 504 and an adjusting rack 505; the sliding mounting plate 501 is fixedly mounted on a vertical plate of the guide pipe 602; the adjusting gear 502 is rotatably arranged in a rotating hole in the middle of the sliding mounting plate 501; the adjusting knob 504 is rotatably mounted in a mounting hole at the corner of the sliding mounting plate 501; an adjusting belt 503 is installed at the pulleys of the adjusting gear 502 and the adjusting belt 503; when the adjusting knob 504 is rotated, the adjusting gear 502 is rotated simultaneously under the action of the adjusting belt 503; pin holes at two ends of the adjusting rack 505 are slidably arranged in the slotted holes of the sliding mounting plate 501; and the adjusting rack 505 is meshed with a gear at the lower end of the adjusting gear 502; the shaft hole of the adjusting rack 505 is connected with the connecting rod B605 in a sliding way; when the adjusting knob 504 is rotated, the adjusting gear 502 is rotated simultaneously under the action of the adjusting belt 503; because the adjusting gear 502 is meshed with the adjusting rack 505, the adjusting rack 505 slides along the direction of the slotted hole of the sliding mounting plate 501, so that the distance between the shaft holes on the other adjusting rack 505 is changed, and the distance is adjusted;

in an alternative embodiment of the present invention, as shown in fig. 10, the threading mechanism 6 includes: the device comprises a gear mounting plate 601, a guide pipe 602, a friction wheel 603, a connecting rod A604, a connecting rod B605, a connecting rod C606, a belt A607, a transmission belt wheel A608, a belt B609, a transmission gear D610 and a connecting rod D611; the gear mounting plate 601 is fixedly mounted on the side surface of the reversing frame 301; the guide pipe 602 is fixedly installed with the gear installation plate 601; the transmission gear D610 is rotatably arranged in a rotating hole on the gear mounting plate 601, and the connecting rod D611 is arranged at the lower part of the power output belt wheel 10 of the reversing mechanism 3 and is rotatably connected with the transmission gear D610; the driving belt wheel A608 is movably arranged in a rotating hole at the other end of the connecting rod D611; the belt B609 is arranged on the transmission gear D610 and the transmission gear A608, so that the transmission gear A608 and the transmission gear D610 synchronously rotate; one end of the connecting rod C606 is rotatably arranged on the upper end surface of the transmission belt wheel A608; the other end of the connecting rod C606 is rotationally connected with a rotating shaft of the friction wheel 603; the belt A607 is arranged on a synchronous wheel of the friction wheel 603 and the transmission belt wheel A608, so that the friction wheel 603 and the transmission belt wheel A608 rotate synchronously; the connecting rod B605 is rotatably arranged on the support of the guide pipe 602; two ends of the connecting rod A604 are rotatably arranged with the two connecting rods B605 at the same time; thereby leading the guide tube 602, the connecting rod B605 and the connecting rod A604 to form a parallelogram mechanism; the friction wheel 603 is rotatably arranged in a rotating hole in the middle of the connecting rod A604; the gear mounting plate 601 and the guide tube 602 provide structural support for the present section; the transmission gear D610 receives the power transmitted by the transmission bevel gear A4 and changes direction through the meshing of the two transmission gears D610; meanwhile, the friction wheel 603, the belt A607, the transmission belt wheel A608, the belt B609 and the transmission gear D610 form a belt wheel set, and the rotation of the transmission gear D610 in the direction converted is transmitted to the friction wheel 603; the connecting rod B605 is driven to deviate by adjusting the distance adjusting mechanism 5, so that the two friction wheels 603 contact with the cable and generate certain pressure; when the friction wheel 603 rotates, the cable passing through the guide pipe 602 is driven to move, so that the purpose of threading is realized;

in an alternative embodiment of the present invention, as shown in fig. 10, the side surface of the friction wheel 603 is provided with an arc-shaped rubber outer ring; the arc-shaped rubber outer ring has certain elasticity, deformation is allowed, the friction force of the outer surface of the arc-shaped rubber outer ring is large, when a cable is threaded to the threading pipe or taken out of the threading pipe, the friction force can be provided, and the cable is guaranteed to move along with the friction wheel.

The working principle of the invention is as follows: when the device is used, the switch 8 is pressed to switch on the power supply, and when the battery 9 supplies energy to the device, the power motor 7 starts to rotate; the power belt 2 and the power output belt wheel 10 transmit the power of the power motor 7 to the threading shaft tube 307; the threading shaft tube 307 drives the contact gear A302 to rotate; the contact gear A302 is meshed with the transmission gear C309 to drive the contact gear A302 and the gear shaft 308 to rotate; since the two transmission gears C309 in the middle are meshed, all the gear shafts 308 and the transmission gears C309 rotate as the contact gear a302 rotates; since the contact gear B305 is meshed with the transmission gear C309, the contact gear B305 rotates synchronously, but the rotation direction of the contact gear B305 is opposite to that of the contact gear A302; the upper part of the reversing handle 303 is a push handle, the lower part of the reversing handle is coaxial with the reversing teeth 304, the reversing teeth 304 are fastened, and the reversing teeth 304 can only slide under the action of the reversing handle 303; the mounting hole on the reversing tooth 304 is slidably mounted on the slot hole on the side surface of the transmission bevel gear B306; the reversing teeth 304 can slide along the slotted holes, and meanwhile, the reversing teeth 304 rotate to drive the transmission bevel gear B306 to rotate; when the reversing handle 303 is pushed to push the handle, the reversing handle 303 drives the reversing tooth 304 to slide along the transmission bevel gear B306, and in the limit position, the reversing tooth 304 is contacted with the contact gear A302 or the contact gear B305 and rotates under the driving of the contact gear A302 or the contact gear B305; thereby driving the transmission bevel gear B306 to rotate, and the rotating direction is the same as the direction of the part contacted with the reversing gear 304, so that the reversing mechanism 3 completes the power output and reversing functions of the power motor 7; then the transmission bevel gear B306 is meshed with the transmission bevel gear A4; the transmission bevel gear A4 transmits the power transmitted by the reversing mechanism 3 forwards after reducing the speed, and transmits the power to the transmission gear D610 through a pulley set; the transmission gear D610 receives the power transmitted by the transmission bevel gear A4 and changes direction through the meshing of the two transmission gears D610; meanwhile, the friction wheel 603, the belt A607, the transmission belt wheel A608, the belt B609 and the transmission gear D610 form a belt wheel set, and the rotation of the transmission gear D610 in the direction converted is transmitted to the friction wheel 603; the adjusting knob 504 is rotated, and the adjusting gear 502 can rotate simultaneously under the action of the adjusting belt 503; because the adjusting gear 502 is meshed with the adjusting rack 505, the adjusting rack 505 slides along the direction of the slotted hole of the sliding mounting plate 501, so that the distance between the shaft holes on the other adjusting rack 505 is changed, and the distance is adjusted; the connecting rod B605 is driven to deviate by adjusting the distance adjusting mechanism 5, so that the two friction wheels 603 contact with the cable and generate certain pressure; when the friction wheel 603 rotates, the cable passing through the guide pipe 602 is driven to move, so that the purpose of threading is realized; the portable multifunctional desk is simple in structure, easy to carry and convenient to operate, and can provide convenience for workers in related fields.

Claims

1. A handheld threading device, its characterized in that: comprises a shell (1), a power belt (2), a reversing mechanism (3), a transmission bevel gear A (4), a spacing adjusting mechanism (5), a threading mechanism (6), a power motor (7), a switch (8), a battery (9) and a power output belt wheel (10); the shell (1) is fixedly arranged on the periphery of the device; the power belt (2) is fixedly arranged on a driven belt wheel at the excircle of the threading shaft tube (307); the other end is rotationally connected with a power output belt wheel (10); the reversing mechanism (3) is fixedly arranged in the shell (1); the threading mechanism (6) is fixedly arranged on the front end surface of the reversing mechanism (3); the gear mounting plate (601) is fixedly mounted on the reversing frame (301); the transmission bevel gear A (4) is rotatably arranged on the gear mounting plate (601); the transmission bevel gear B (306) is meshed with the transmission bevel gear A (4); a sliding mounting plate (501) of the spacing adjusting mechanism (5) is fixedly mounted on a vertical plate of the guide pipe (602); and the shaft hole on the adjusting rack (505) of the spacing adjusting mechanism (5) is connected with the slotted hole on the connecting rod B (605) in a sliding way; the power motor (7) is fixedly arranged on the lower surface of a reversing frame (301) of the reversing mechanism (3); and a motor shaft of the power motor (7) is fixedly arranged with the power output belt wheel (10); the power of the power motor (7) can be transmitted to the reversing mechanism (3) by a belt wheel group consisting of a power belt (2) and a power output belt wheel (10); the battery (9) is fixedly arranged on the lower surface of the power motor (7); the battery (9) provides power for the device as an energy source; the switch (8) is slidably mounted in an opening of the housing (1).

2. A hand-held threading device according to claim 1 wherein: the reversing mechanism (3) comprises: the device comprises a reversing frame (301), a contact gear A (302), a reversing handle (303), a reversing tooth (304), a contact gear B (305), a transmission bevel gear B (306), a threading shaft tube (307), a gear shaft (308) and a transmission gear C (309);

the transmission bevel gear B (306) is rotatably arranged in a circular hole in the side surface of the reversing frame (301); the threading shaft tube (307) is coaxial with the transmission bevel gear B (306); the transmission bevel gear B (306) and the threading shaft tube (307) are fixedly arranged; the threading shaft tube (307) penetrates through the round hole at the other side of the reversing frame (301), and the threading shaft tube (307) and the reversing frame (301) are rotatably installed; the contact gear A (302) is fixedly arranged on the threading shaft tube (307) and rotates along with the rotation of the threading shaft tube (307); simultaneously, the contact gear A (302) is meshed with a transmission gear C (309); four transmission gears C (309) are respectively and fixedly arranged on the gear shaft (308); two gear shafts (308) are rotatably arranged in the openings at two sides of the reversing frame (301); and the two transmission gears C (309) at the middle part are mutually meshed; the contact gear B (305) is fixedly arranged on the transmission bevel gear B (306); while the contact gear B (305) is meshed with a transmission gear C (309); the reversing handle (303) is slidably arranged in a slotted hole on the upper end surface of the reversing frame (301); the reversing handle (303) and the reversing teeth (304) are rotatably arranged; the reversing gear (304) is slidably arranged on the transmission bevel gear B (306); and the round hole on the reversing tooth (304) is slidably mounted with the slotted hole of the transmission bevel gear B (306); the reversing handle (303) can drive the reversing tooth (304) to slide on the transmission bevel gear B (306); and the reversing tooth (304) can contact with the gear B (305) or the transmission bevel gear B (306), so that the transmission bevel gear B (306) is driven to rotate, and the direction is consistent with the rotating direction of the reversing tooth (304).

3. A hand-held threading device according to claim 1, characterized in that the distance adjustment mechanism (5) comprises: the device comprises a sliding mounting plate (501), an adjusting gear (502), an adjusting belt (503), an adjusting knob (504) and an adjusting rack (505);

the sliding mounting plate (501) is fixedly mounted on a vertical plate of the guide pipe (602); the adjusting gear (502) is rotatably arranged in a rotating hole in the middle of the sliding mounting plate (501); the adjusting knob (504) is rotatably arranged in a mounting hole at the corner of the sliding mounting plate (501); the adjusting belt (503) is arranged at the pulleys of the adjusting gear (502) and the adjusting belt (503); pin holes at two ends of the adjusting rack (505) are slidably arranged in a slotted hole of the sliding mounting plate (501); the adjusting rack (505) is meshed with a gear at the lower end of the adjusting gear (502); the shaft hole of the adjusting rack (505) is connected with the connecting rod B (605) in a sliding way.

4. A hand-held threading device according to claim 3, characterized in that the upper end of the adjustment knob (504) is provided with a knob-like adjustment wheel, which is provided with rubber teeth to prevent slippage of the hand during the rotation of the knob.

5. A hand-held threading device according to claim 1, characterized in that the threading mechanism (6) comprises: the device comprises a gear mounting plate (601), a guide pipe (602), a friction wheel (603), a connecting rod A (604), a connecting rod B (605), a connecting rod C (606), a belt A (607), a transmission belt wheel A (608), a belt B (609), a transmission gear D (610) and a connecting rod D (611);

the gear mounting plate (601) is fixedly mounted on the side face of the reversing frame (301); the guide pipe (602) is fixedly arranged with the gear mounting plate (601); a transmission gear D (610) is rotatably arranged in a rotating hole on the gear mounting plate (601), and a connecting rod D (611) is arranged at the lower part of a power output belt wheel (10) of the reversing mechanism (3) and is rotatably connected with the transmission gear D (610); the transmission belt wheel A (608) is movably arranged in a rotating hole at the other end of the connecting rod D (611); a belt B (609) is arranged on the transmission gear D (610) and the transmission belt wheel A (608); one end of the connecting rod C (606) is rotatably arranged on the upper end surface of the transmission belt wheel A (608); the other end of the connecting rod C (606) is rotationally connected with a rotating shaft of the friction wheel (603); a belt A (607) is arranged on a synchronous wheel of the friction wheel (603) and the transmission belt wheel A (608) to ensure that the friction wheel (603) and the transmission belt wheel A (608) synchronously rotate; the connecting rod B (605) is rotatably arranged on a support of the guide pipe (602); two ends of the connecting rod A (604) are rotatably arranged with the two connecting rods B (605) at the same time; thereby leading the guide tube (602), the connecting rod B (605) and the connecting rod A (604) to form a parallelogram mechanism; the friction wheel (603) is rotatably arranged in a rotating hole in the middle of the connecting rod A (604).

6. A hand-held threading device according to claim 5, characterized in that the sides of the friction wheel (603) are provided with an arc-shaped rubber outer ring.