Electric screw turning device used in narrow space

Abstract

The utility model discloses an electric screw turning device used in narrow space, which comprises a main machine, a driving motor and a sleeve component, the sleeve component comprises a connecting seat, a transmission worm, a transmission worm gear, a driving gear, at least one transition gear and a sleeve gear piece, the inside of the connecting seat is hollowed out to form a worm assembly cavity, one side of the connecting seat is provided with an extension arm, and the extension arm is connected with the transmission worm. Wherein the sleeve gear piece is rotationally installed on the side, close to the end of the extension arm, of the gear assembly cavity, a sleeve opening is formed in the center of the sleeve gear piece and exposed out of the side face of the extension arm, a gear tooth structure is formed in the circumferential portion of the sleeve gear piece, and the sleeve gear piece is connected with the adjacent transition gear through the gear tooth structure in a meshed mode. Compared with the prior art, automatic screw turning in a narrow space is achieved by arranging a gear structure in the extension arm and a customized sleeve gear piece, design is ingenious, and use is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric wrench technical field especially is electric screwdriver for narrow space. BACKGROUND

[0002] Electric wrench refers to the electric tool of screwing and unscrewing bolt and nut, and is a kind of tool for tightening high-strength bolt.It is used for the initial tightening, final tightening of high-strength bolt construction of large hexagonal head high-strength bolt in steel structure bridge, factory building, chemical industry, power equipment installation, and the initial tightening of torsional shear type high-strength bolt, and the occasion that the torque or axial force of bolt fastener has strict requirement.

[0003] When the bolt and nut need to be twisted in narrow space, the existing electric wrench cannot be stretched into the narrow space to tighten and twist due to the large volume of sleeve assembly, can only be manually twisted by conventional wrench tool, and operation is very inconvenient, so it is necessary to improve. UTILITY MODEL CONTENT

[0004] In view of the defects in the prior art, the utility model aims at providing an electric screwdriver for narrow space, which can automatically twist the bolt and nut in narrow space and reduce the work difficulty of bolt disassembly in narrow space.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of an electric screwdriver for narrow space, which comprises a host, a driving motor and a sleeve assembly, the driving motor is arranged in the interior of the host, the sleeve assembly is fixedly installed at the end of the host, the sleeve assembly comprises a connecting seat, a transmission worm, a transmission worm wheel, a driving gear, at least one transition gear and a sleeve gear piece, the interior of the connecting seat is hollowed out to form a worm assembly cavity, one side of the connecting seat is provided with an extension arm, the interior of the extension arm is hollowed out to form a gear assembly cavity, and the gear assembly cavity is communicated with the worm assembly cavity; the transmission worm is rotatably installed in the worm assembly cavity of the connecting seat, one end of the transmission worm is formed with a spiral tooth, and the other end is coaxially connected to the output shaft of the driving motor; a transmission shaft is rotatably installed at the intersection of the gear assembly cavity and the worm assembly cavity, the transmission worm wheel and the driving gear are sleeved on the transmission shaft, the transmission worm wheel and the driving gear are synchronously rotated and matched, the transmission worm wheel is located below the driving gear, and the transmission worm wheel is meshed with the spiral tooth of the transmission worm; the driving gear and each transition gear are sequentially assembled in the interior of the gear assembly cavity along the extension direction of the extension arm, and are sequentially meshed; the sleeve gear piece is rotatably installed at one side of the end of the gear assembly cavity close to the extension arm, a sleeve opening is formed at the central position of the sleeve gear piece, the sleeve opening is exposed to the side surface of the extension arm, the circumferential part of the sleeve gear piece is formed with a gear structure, and the sleeve gear piece is meshed with the adjacent transition gear through the gear structure.

[0006] In a further technical solution, the side surface of the extension arm is provided with a cover plate, the cover plate is assembled on the extension arm by bolts, and the cover plate covers the gear assembly cavity, wherein at least two upper shaft holes and one upper sleeve hole are arranged on the cover plate in intervals; the connecting seat is provided with a number of matching lower shaft holes and lower sleeve holes, each lower shaft hole is coaxially aligned with each upper shaft hole, and the two ends of the transmission shaft are respectively rotatably connected to the corresponding upper shaft hole and lower shaft hole; a central shaft hole is formed at the center position of each transition gear, a gear shaft is assembled in the central shaft hole, and the two ends of each gear shaft are respectively rotatably connected to the corresponding upper shaft hole and lower shaft hole; the two side surfaces of the sleeve gear part are respectively formed with protruding rotary rings, the two rotary rings are respectively rotatably installed in the corresponding upper sleeve hole and lower sleeve hole, and the rotary rings on the two sides are flush with the two side surfaces of the extension arm.

[0007] In a further technical solution, the sleeve gear part is a replaceable part, different sleeve gear parts are formed with different specifications of sleeve openings, and the sleeve openings include hexagonal sleeve openings, square sleeve openings and twelve-corner sleeve openings.

[0008] In a further technical solution, the bottom of the sleeve opening is formed with a center protruding limiting ring.

[0009] In a further technical solution, the width W of the extension arm is 1cm-4cm, the extension length L is 5cm-15cm, and the thickness T is 2mm-10mm.

[0010] In a further technical solution, a worm positioning ring is fixedly installed inside the worm assembly cavity, a positioning hole is formed at the center position of the worm positioning ring, and the transmission worm is movably inserted into the positioning hole.

[0011] In a further technical solution, a shaft coupling is connected between the transmission worm and the output shaft of the driving motor.

[0012] In a further technical solution, the connecting seat is fixedly assembled on the main machine by bolts, the inner side of the connecting seat is provided with a motor fixing ring seat, the motor fixing ring seat is coaxially arranged with the worm positioning ring, and the driving motor is fixedly installed on the motor fixing ring seat.

[0013] In a further technical solution, the main machine is provided with a handle, the handle or the main machine is provided with a control panel; a battery is installed at the bottom of the handle, a start switch and a forward-reverse switch are arranged on the side of the handle, and the battery, the start switch and the forward-reverse switch are respectively connected to the control panel, and the control panel is connected to the driving motor.

[0014] In a further technical solution, a keyless connection structure is arranged between the transmission worm wheel, the driving gear and the transmission shaft, wherein a circular keyless shaft hole with a cut is arranged at the center of the transmission worm wheel and the driving gear respectively; a keyless connection part is formed on the middle upper part of the transmission shaft, the cross section of the keyless connection part matches the keyless shaft hole, and the transmission worm wheel and the driving gear are respectively sleeved on the keyless connection part through the keyless shaft holes to realize synchronous rotation cooperation.

[0015] After the above structure is adopted, the utility model has the advantages compared with the prior art: the utility model is provided with the sleeve assembly with the extension arm, the transition gear and the customized sleeve gear part are arranged in the extension arm, the torsion transmission of the thin extension arm is realized, the automatic screwing in the narrow space is realized, the design is ingenious, the structure is stable and reliable; the power transmission of the gear set and the driving motor is realized by the worm and gear structure, the advantages of high strength are achieved, and high-strength bolt construction can be realized; the detachable cover plate structure facilitates the maintenance of the internal gear structure and facilitates the replacement and use of sleeve gear parts of different specifications. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model is further described below in combination with the drawings and embodiments.

[0017] Fig. 1 is the structural schematic diagram of the utility model.

[0018] Fig. 2 is the exploded view of the sleeve assembly in the utility model.

[0019] Fig. 3 is the sectional view of the sleeve assembly in the utility model.

[0020] Fig. 4 is the structural schematic diagram of another view of the sleeve assembly in the utility model. DETAILED DESCRIPTION

[0021] The following is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model.

[0022] In order to solve the problem that the electric sleeve wrench in the prior art cannot be used for construction in a narrow space, the inventor has developed an automatic screwing device specially used in a narrow space. In the process of automatic equipment maintenance and maintenance, it is necessary to ensure normal production of equipment in a short time; the electric screwing device specially used in a narrow space can quickly complete equipment maintenance and ensure normal production.

[0023] As Figs. 1 to 4As shown, a narrow space electric screwdriver, including main machine 1, drive motor 29 and sleeve assembly 2, drive motor 29 is arranged in the inside of main machine 1, sleeve assembly 2 is fixedly installed on the end of main machine 1, sleeve assembly 2 includes connecting seat 21, transmission worm 27, transmission worm gear 25, driving gear 24, at least one transition gear 23 and sleeve gear piece 20, the inside of connecting seat 21 is hollow and forms worm assembly cavity, one side of connecting seat 21 is provided with extension arm 211, the inside of extension arm 211 is hollow and forms gear assembly cavity 210, gear assembly cavity 210 is communicated with worm assembly cavity, transmission worm 27 is rotatably installed in the worm assembly cavity of connecting seat 21, one end of transmission worm 27 is formed with helical tooth 271, the other end is connected to the output shaft of drive motor 29, the intersection of gear assembly cavity 210 and worm assembly cavity is provided with a transmission shaft 26, transmission worm gear 25 and driving gear 24 are sleeved on transmission shaft 26, transmission worm gear 25 and driving gear 24 are synchronously rotatable, transmission worm gear 25 is located below driving gear 24, and transmission worm gear 25 engages with helical tooth 271 of transmission worm 27, driving gear 24 and each transition gear 23 are sequentially assembled in the inside of gear assembly cavity 210 along the extension direction of extension arm 211, and are sequentially engaged, sleeve gear piece 20 is rotatably installed on one side of the end of gear assembly cavity 210 close to extension arm 211, sleeve gear piece 20 is provided with sleeve 201 at the center position, sleeve 201 is exposed on the side surface of extension arm 211, the circumferential part of sleeve gear piece 20 is formed with gear structure 202, and sleeve gear piece 20 is connected with the adjacent transition gear 23 through gear structure 202.

[0024] The sleeve assembly 2 with the extension arm is provided, the transition gear 23 and the customized sleeve gear piece 20 are arranged in the inside of the extension arm 21, the torsion transmission of the thin extension arm 21 is realized, and the automatic screwing in the narrow space is realized.

[0025] The gear transmission structure is arranged in the inside of the extension arm 221 in a transverse arrangement, the torsion transmission is realized, the sleeve gear piece 20 with the sleeve 201 and the gear structure 202 is used to simultaneously complete the clamping and transmission engagement of the bolt, the design is ingenious, the cost is relatively low, and the sleeve gear piece 20 can provide the hard torsion / soft force output of 22N.M / 15N.M.

[0026] The worm and gear structure is used for realizing the power transmission of the gear set and the drive motor 29, has the advantages of high strength, and can realize the high-strength bolt construction.

[0027] The thickness T of the extension arm 221 in this embodiment is 5 mm, the extension length L is 15 cm, and the width W is 2 cm.

[0028] The extension length L of the extension arm 221 can be extended by arranging a proper number of transition gears 23 inside it to extend the extension distance of the torque transmission. In this embodiment, the number of transition gears 23 is two.

[0029] Specifically, the side surface of the extension arm 211 is provided with a cover plate 22 which is assembled to the extension arm 211 by bolts and covers the gear assembly cavity 210, wherein at least two upper shaft holes 222 and one upper sleeve hole 221 are arranged on the cover plate 22 in intervals; the connecting seat 21 is provided with a number of lower shaft holes 2102 and lower sleeve holes 2101, each lower shaft hole 2102 is coaxially aligned with each upper shaft hole 222, and the two ends of the transmission shaft 26 are respectively rotatably connected to the corresponding upper shaft hole 222 and lower shaft hole 2102; the center position of each transition gear 23 is provided with a center shaft hole, a gear shaft 231 is assembled in the center shaft hole, and the two ends of each gear shaft 231 are respectively rotatably connected to the corresponding upper shaft hole 222 and lower shaft hole 2102; the two side surfaces of the sleeve gear part 20 are respectively formed with protruding rotary rings, the two rotary rings are respectively rotatably installed in the corresponding upper sleeve hole 221 and lower sleeve hole 2101, and the rotary rings on the two sides are flush with the two side surfaces of the extension arm 211.

[0030] The sleeve gear part 20 is a replaceable part, different sleeve gear parts 20 are formed with different specifications of sleeve openings 201, and the sleeve openings 201 include hexagonal sleeve openings, square sleeve openings and twelve-corner sleeve openings.

[0031] The detachable cover plate structure facilitates the maintenance of the internal gear structure and the replacement and use of different specifications of sleeve gear parts 20.

[0032] In this embodiment, the bottom of the sleeve opening 201 is formed with a center protruding limiting ring. In actual operation, the sleeve opening 201 is sleeved on the target nut 9, and the limiting ring is limitedly matched with the nut 9, which facilitates the construction positioning and pressing of the nut 9 or screw rod, and further improves the ease of use of the equipment.

[0033] Specifically, the side of the connecting seat 21 away from the extension arm 221 is provided with a connecting frame body 270, the inside of the connecting frame body 270 is hollow, and a worm assembly cavity is formed; a worm positioning ring 2701 is fixedly installed in the inside of the worm assembly cavity, a positioning hole is formed in the center position of the worm positioning ring 2701, and the transmission worm 27 is movably inserted into the positioning hole.

[0034] Specifically, the transmission worm 27 is connected with the output shaft of the driving motor 29 through a shaft coupling 28. The coaxial torque transmission of the two can be realized.

[0035] Specifically, the connecting frame 270 of the connecting seat 21 is inserted and mounted on the main machine 1 and is assembled on the main machine 1 by screwing, and the side of the connecting frame 270 is provided with a motor fixing ring seat 291 coaxially arranged with the worm positioning ring 2701, and the driving motor 29 is fixedly mounted on the motor fixing ring seat 291.

[0036] Specifically, the main machine 1 is provided with a handle 11, and the handle 11 or the inside of the main machine 1 is provided with a control panel; the bottom of the handle 11 is provided with a battery 13, and the side of the handle 11 is provided with a starting switch 12 and a forward-reverse switch, and the battery 13, the starting switch 12 and the forward-reverse switch are respectively connected to the control panel, and the control panel is connected to the driving motor 29. The forward-reverse switch can realize three-grade switching of forward rotation, locking and reverse rotation.

[0037] The battery 13 in the embodiment is a lithium battery, the model is "5PT-1206-BAT", the battery capacity is "12V / 1300mAh", and the no-load running time of the electric screwdriver is "50 minutes".

[0038] In the embodiment, a keyless connection structure is arranged between the transmission worm 25, the driving gear 24 and the transmission shaft 26, wherein a circular keyless shaft hole 240 with a cut is arranged at the center of the transmission worm 25 and the driving gear 24 respectively; a keyless connection part is formed on the middle upper part of the transmission shaft 26, the cross section of the keyless connection part matches the keyless shaft hole 240, and the transmission worm 25 and the driving gear 24 are respectively sleeved on the keyless connection part through the keyless shaft hole 240 to realize synchronous rotation cooperation.

[0039] Of course, other profile connection structures can also be arranged between the transmission worm 25, the driving gear 24 and the transmission shaft 26, and the key connection structure can also be arranged, which cannot be considered as the only connection mode.

[0040] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. An electric screwdriver for use in confined spaces, comprising a main unit (1), a drive motor (29), and a sleeve assembly (2), wherein the drive motor (29) is disposed inside the main unit (1), and the sleeve assembly (2) is fixedly mounted on the end of the main unit (1), characterized in that: The sleeve assembly (2) includes a connecting seat (21), a transmission worm (27), a transmission worm wheel (25), a drive gear (24), at least one transition gear (23), and a sleeve gear component (20). The interior of the connecting seat (21) is hollowed out to form a worm gear assembly cavity. An extension arm (211) is provided on one side of the connecting seat (21). The interior of the extension arm (211) is hollowed out to form a gear assembly cavity (210). The gear assembly cavity (210) is connected to the worm gear assembly cavity. The transmission worm (27) is rotatably mounted in the worm assembly cavity of the connecting seat (21). One end of the transmission worm (27) is formed with helical teeth (271), and the other end is connected to the output shaft of the drive motor (29). A drive shaft (26) is rotatably mounted at the junction of the gear assembly cavity (210) and the worm assembly cavity. The drive worm wheel (25) and the driving gear (24) are respectively sleeved on the drive shaft (26). The drive worm wheel (25) and the driving gear (24) rotate synchronously. The drive worm wheel (25) is located below the driving gear (24). Furthermore, the drive worm wheel (25) meshes with the helical teeth (271) of the drive worm (27). The drive gear (24) and each transition gear (23) are sequentially assembled inside the gear assembly cavity (210) along the extension direction of the extension arm (211) and meshed together in sequence. The sleeve gear component (20) is rotatably mounted on the side of the gear assembly cavity (210) near the end of the extension arm (211). A sleeve opening (201) is provided at the center of the sleeve gear component (20), and the sleeve opening (201) is exposed on the side of the extension arm (211). A gear tooth structure (202) is formed on the circumference of the sleeve gear component (20). The sleeve gear component (20) meshes with the adjacent transition gear (23) through the gear tooth structure (202).

2. The electric screwdriver for use in confined spaces according to claim 1, characterized in that: The side of the extension arm (211) is provided with a cover plate (22), which is bolted to the extension arm (211) and covers the gear assembly cavity (210). The cover plate (22) is provided with at least two upper shaft holes (222) and one upper sleeve rotating hole (221) spaced apart; the connecting seat (21) is provided with a matching number of lower shaft holes (2102) and lower sleeve rotating holes (2101), each lower shaft hole (2102) being coaxially aligned with each upper shaft hole (222), and the two ends of the transmission shaft (26) being rotatably connected to the corresponding upper shaft hole (222) and lower shaft hole (2102); each of the transition gears (23) A central shaft hole is provided at the center position, and a gear shaft (231) is installed in the central shaft hole. The two ends of each gear shaft (231) are rotatably connected to the corresponding upper shaft hole (222) and lower shaft hole (2102). The sleeve gear component (20) has protruding rotating rings formed on both sides. These two rotating rings are rotatably installed in the corresponding upper sleeve rotating hole (221) and lower sleeve rotating hole (2101), and the rotating rings on both sides are flush with the two sides of the extension arm (211).

3. The electric screwdriver for use in confined spaces according to claim 2, characterized in that: The sleeve gear component (20) is a replaceable component. Different sleeve gear components (20) are formed with different specifications of the sleeve opening (201). The sleeve opening (201) includes hexagonal sleeve opening, square sleeve opening and dodecagonal sleeve opening.

4. The electric screwdriver for use in confined spaces according to claim 3, characterized in that: The bottom of the sleeve (201) is formed with a limiting ring that protrudes toward the center.

5. The electric screwdriver for use in confined spaces according to claim 1, characterized in that: The width W of the extension arm (211) is 1cm-4cm, the extension length L is 5cm-15cm, and the thickness T is 2mm-10mm.

6. The electric screwdriver for use in confined spaces according to claim 1, characterized in that: A worm positioning ring (2701) is fixedly installed inside the worm assembly cavity. A positioning hole is opened at the center of the worm positioning ring (2701), and the transmission worm (27) is movably inserted into the positioning hole.

7. An electric screwdriver for use in confined spaces according to claim 6, characterized in that: A coupling (28) is connected between the transmission worm (27) and the output shaft of the drive motor (29).

8. An electric screwdriver for use in confined spaces according to claim 7, characterized in that: The connecting seat (21) is fixedly assembled to the host (1) by bolts. A motor fixing ring seat (291) is provided on the inner side of the connecting seat (21). The motor fixing ring seat (291) is coaxially arranged with the worm positioning ring (2701). The drive motor (29) is fixedly installed on the motor fixing ring seat (291).

9. An electric screwdriver for use in confined spaces according to claim 8, characterized in that: The main unit (1) is provided with a handle (11), and a control panel is provided inside the handle (11) or the main unit (1); a battery (13) is installed at the bottom of the handle (11), and a start switch (12) and a forward / reverse switch are provided on the side of the handle (11). The battery (13), start switch (12) and forward / reverse switch are respectively connected to the control panel, and the control panel is connected to the drive motor (29).

10. An electric screwdriver for use in confined spaces according to claim 1, characterized in that: A keyless connection structure is provided between the transmission worm gear (25), the driving gear (24), and the transmission shaft (26). Among them, the transmission worm gear (25) and the driving gear (24) are respectively provided with a circular keyless shaft hole (240) with a cut at the center position; the transmission shaft (26) is formed with a keyless connecting part in the upper middle part, the cross section of the keyless connecting part matches the keyless shaft hole (240), and the transmission worm gear (25) and the driving gear (24) are respectively sleeved on the keyless connecting part through their keyless shaft holes (240) to achieve synchronous rotational engagement.

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