阅读说明：本技术 一种中心通道螺丝刀头防丢内置式螺丝刀 (Central channel screwdriver bit anti-lost built-in screwdriver ) 是由 张凤英 于 2021-08-21 设计创作，主要内容包括：本发明公开了一种中心通道螺丝刀头防丢内置式螺丝刀,包括旋转座、旋转辊、螺丝刀头、螺丝刀头套筒座；旋转筒轴上端设置有与顶杆通道孔连通的螺丝刀头套筒座；顶杆通道孔内设置有顶杆；旋转辊上设置有螺丝刀头储藏室,螺丝刀头储藏室朝向旋转筒轴的一侧设置有供螺丝刀头通过的螺丝刀头进出口,螺丝刀头储藏室内设置有螺丝刀头；旋转筒轴上设置有使螺丝刀头储藏室与顶杆通道孔连通的第三通道孔,螺丝刀头储藏室之间设置有用于堵住第三通道孔的封闭板。本发明能够在使螺丝刀本体和螺丝刀不分离的状态下完成更换螺丝刀头的工作,使螺丝刀头更换方便、高效,同时螺丝刀头不容易丢失；多个旋转辊使螺丝刀内部可储存较多的螺丝刀头。(The invention discloses a built-in screwdriver with a central channel and an anti-lost screwdriver head, which comprises a rotating seat, a rotating roller, a screwdriver head and a screwdriver head sleeve seat, wherein the rotating seat is provided with a plurality of screw holes; the upper end of the rotary cylinder shaft is provided with a screwdriver bit sleeve seat communicated with the ejector rod channel hole; a mandril is arranged in the mandril channel hole; a screwdriver head storage chamber is arranged on the rotary roller, one side of the screwdriver head storage chamber, which faces the rotary cylinder shaft, is provided with a screwdriver head inlet and a screwdriver head outlet through which a screwdriver head passes, and the screwdriver head storage chamber is internally provided with a screwdriver head; and a third channel hole for communicating the screwdriver head storage chambers with the mandril channel hole is formed in the rotary cylinder shaft, and a sealing plate for blocking the third channel hole is arranged between the screwdriver head storage chambers. The screwdriver head replacement device can complete the work of replacing the screwdriver head in the state that the screwdriver body and the screwdriver are not separated, so that the screwdriver head is convenient and efficient to replace, and meanwhile, the screwdriver head is not easy to lose; the plurality of rotating rollers enable the interior of the screwdriver to store more screwdriver bits.)

1. The utility model provides a built-in screwdriver is prevented losing by center channel screwdriver bit which characterized in that: the screwdriver comprises a rotating seat, a rotating roller, a screwdriver head sleeve seat and a rotating driving mechanism for driving the screwdriver head to rotate;

the rotary seat comprises a rotary drum shaft, an upper limiting plate and a lower limiting plate, the upper limiting plate is fixedly arranged at the upper end of the rotary drum shaft, the lower limiting plate is fixedly arranged at the lower end of the rotary drum shaft, the rotary roller is positioned between the upper limiting plate and the lower limiting plate, a rotary shaft hole is formed in the rotary roller, and the rotary drum shaft penetrates through the rotary shaft hole;

a mandril channel hole is formed in the rotary cylinder shaft;

at least two rotating rollers which rotate coaxially are arranged on the rotating cylinder shaft;

the upper end of the rotary cylinder shaft is provided with a screwdriver bit sleeve seat communicated with the ejector rod channel hole;

the ejector rod channel hole is internally provided with an ejector rod used for ejecting the screwdriver head in the rotary cylinder shaft into the screwdriver head sleeve seat;

the rotary roller is provided with screwdriver bit storage chambers in annular arrangement around the rotary shaft hole, one side of each screwdriver bit storage chamber, facing the rotary shaft, is provided with a screwdriver bit inlet and a screwdriver bit outlet through which screwdriver bits pass, and the screwdriver bit storage chambers are internally provided with screwdriver bits;

a third channel hole for communicating the screwdriver head storage chamber with the mandril channel hole is formed in the rotary cylinder shaft, and a sealing plate for blocking the third channel hole is arranged between the screwdriver head storage chambers;

and a rotation driving mechanism for driving the screwdriver head to rotate is arranged between the screwdriver head sleeve seat and the screwdriver head or between the ejector rod and the screwdriver head.

2. The internal screwdriver with loss-proof center channel screwdriver head as recited in claim 1, wherein: and 3 rotating rollers are coaxially arranged on the rotating cylinder shaft.

3. The internal screwdriver with loss-proof center channel screwdriver head as recited in claim 1, wherein: the rotating seat further comprises a rotating sleeve, the rotating sleeve is fixedly arranged on the lower limiting plate or/and the upper limiting plate, and the rotating sleeve is sleeved on the rotating roller.

4. The internal screwdriver with loss-proof center channel screwdriver head as recited in claim 1, wherein: the rotary driving mechanism is located between the screwdriver head and the screwdriver head sleeve seat, the rotary driving mechanism comprises a side limiting groove and a side limiting protrusion, the side limiting groove and the side limiting protrusion can only slide relatively back and forth and can be respectively arranged in an inner hole of the screwdriver head sleeve seat and on the side surface of the screwdriver head, and the side limiting protrusion is arranged in the side limiting groove.

5. The internal screwdriver with loss-proof center channel screwdriver head as recited in claim 1, wherein: the rotary driving mechanism is located between the screwdriver head and the ejector rod and comprises an end limiting groove and an end limiting protrusion, the end limiting groove and the end limiting protrusion are respectively arranged on the contact surface of the ejector rod and the screwdriver head, and the end limiting protrusion is arranged in the end limiting groove.

6. The internal screwdriver with loss-proof center channel screwdriver head as recited in claim 5, wherein: the lower end of the ejector rod is in transmission connection with a rotating shaft of the driving motor.

7. The internal driver of any one of claims 1-6 having a center channel driver head with anti-lost features: be provided with the baffle on the roating seat between the rotatory roller, be provided with the second through-hole that is used for supplying rotatory bobbin shaft to pass through on the baffle.

8. The internal driver of any one of claims 1-6 having a center channel driver head with anti-lost features: the screwdriver head lower extreme is provided with first spacing arch, screwdriver head cover barrel seat upper end inside is provided with the spacing arch of second that is used for restricting first spacing arch to pass through.

9. The internal driver of any one of claims 1-6 having a center channel driver head with anti-lost features: the lower end of the ejector rod is rotatably provided with a positioning sleeve, a first connecting thread is arranged on the positioning sleeve, a second connecting thread is arranged at the lower end of the rotating cylinder shaft, and the second connecting thread is meshed with the first connecting thread.

Technical Field

The invention relates to the technical field of screwdrivers, in particular to the technical field of a built-in screwdriver with a central channel and an anti-lost screwdriver head.

Background

The screwdriver body and the screwdriver head of the traditional multi-head screwdriver are separated when being replaced, after the screwdriver head is used up, other screwdriver heads need to be replaced, the original screwdriver head needs to be extracted, then a new screwdriver head is replaced, meanwhile, the screwdriver head needing to be replaced is arranged in a box which is specially used for storing the screwdriver head, the taking and placing of the screwdriver head are troublesome, and sometimes during work emergency, the replaced screwdriver head is randomly placed and easily lost.

The invention patent with the patent number CN105082043A discloses an electric screwdriver with semi-automatic nail feeding, which stores screws through screw holes in a nail feeding device, drives a drill bit to rotate through a screwdriver main body, and ejects out the screws in the screw holes through the drill bit and screws the screws to rotate, and aims at solving the problem that when the screws are screwed by a screwdriver, the screws are too small and are inconvenient to fix; the effect that above-mentioned patent reaches is when screwing up the screw through this send nail device, do not need the operator to fix the position of waiting to twist the screw with the hand in person, thereby the efficiency of work has been improved, after a screw is twisted on the work piece, only need to rotate the screw carousel, can make the new screw hole that is equipped with the screw aim at the drill bit, the technological effect of this patent does not reach and can make screwdriver body and screwdriver accomplish the change under the state that does not separate, it is convenient to make screwdriver head change, high efficiency, it is difficult to lose to make screwdriver head simultaneously, a large amount of screwdriver heads can be stored to screwdriver inside simultaneously, and the normal use of screwdriver is not influenced.

This patent only discloses the structure and the assembly characteristic that set up one deck screw carousel simultaneously, and when setting up multilayer screw carousel, how the screw carousel of going into the lower part through the upper portion of screw, conveniently gets simultaneously and puts each layer screw carousel, and the operation is not troublesome, does not disclose corresponding technical characteristic in this patent. Meanwhile, the patent document does not disclose the matching mode and the structural characteristics of each screw turntable on the premise of conveniently taking and placing the screws. When the screws are unscrewed from the workpiece, storage is not necessary, and if the screws are stored in the lower screw turnplate, how is done, and the normal use of other drill bits is not influenced.

The model of drill bit is fixed among the technical scheme that this patent is disclosed, does not have corresponding technical characterstic about screwdriver head changes, can't satisfy the demand of different model screwdriver head's quick replacement, does not disclose corresponding technical characterstic yet.

The patent only sets up the screw hole for storing the screw on the screw carousel, does not disclose when setting up the multilayer screw carousel, and the problem of the screw business turn over in the lower floor screw carousel, how to screw on the work piece with the cooperation of drill bit on the screw on the lower floor screw carousel, and above-mentioned problem is not disclosed in this patent document.

The utility model with the patent number of CN2810909 discloses a combined screwdriver, which mainly aims at the technical problem that the problem of difficulty in checking and pulling out the jack of the screwdriver is solved due to the fact that the traditional screwdriver head fixes the screwdriver head by using the elasticity or the buckle of the jack in order to prevent the screwdriver head from easily falling off from the jack; screwdriver and screwdriver body separation all need be made in every change of screwdriver in this patent, if the staff can not all adorn immediately on the screwdriver body with the screwdriver that all will change to every time, screwdriver head loses easily, all will follow the screwdriver body with the screwdriver head simultaneously and take off the change at every turn, troublesome poeration.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides a built-in screwdriver with a central channel screwdriver head capable of preventing loss, solves the problem that the operation is troublesome when the screwdriver head needs to be replaced under the condition that a screwdriver body needs to be separated from the screwdriver head in the using process of the existing screwdriver, and simultaneously solves the problem that the screwdriver head is easy to lose due to the fact that the traditional screwdriver body needs to be separated from the screwdriver head.

In order to achieve the purpose, the invention provides a built-in screwdriver with a central channel and a loss-proof screwdriver head, which comprises a rotating seat, a rotating roller, a screwdriver head sleeve seat and a rotation driving mechanism for driving the screwdriver head to rotate;

the rotary seat comprises a rotary drum shaft, an upper limiting plate and a lower limiting plate, the upper limiting plate is fixedly arranged at the upper end of the rotary drum shaft, the lower limiting plate is fixedly arranged at the lower end of the rotary drum shaft, the rotary roller is positioned between the upper limiting plate and the lower limiting plate, a rotary shaft hole is formed in the rotary roller, and the rotary drum shaft penetrates through the rotary shaft hole;

a mandril channel hole is formed in the rotary cylinder shaft;

at least two rotating rollers which rotate coaxially are arranged on the rotating cylinder shaft;

the upper end of the rotary cylinder shaft is provided with a screwdriver bit sleeve seat communicated with the ejector rod channel hole;

the ejector rod channel hole is internally provided with an ejector rod used for ejecting the screwdriver head in the rotary cylinder shaft into the screwdriver head sleeve seat;

the rotary roller is provided with screwdriver bit storage chambers in annular arrangement around the rotary shaft hole, one side of each screwdriver bit storage chamber, facing the rotary shaft, is provided with a screwdriver bit inlet and a screwdriver bit outlet through which screwdriver bits pass, and the screwdriver bit storage chambers are internally provided with screwdriver bits;

a third channel hole for communicating the screwdriver head storage chamber with the mandril channel hole is formed in the rotary cylinder shaft, and a sealing plate for blocking the third channel hole is arranged between the screwdriver head storage chambers;

and a rotation driving mechanism for driving the screwdriver head to rotate is arranged between the screwdriver head sleeve seat and the screwdriver head or between the ejector rod and the screwdriver head.

Preferably, 3 rotating rollers are coaxially arranged on the rotating cylinder shaft.

Preferably, the rotating seat further comprises a rotating sleeve, the rotating sleeve is fixedly arranged on the lower limiting plate or/and the upper limiting plate, and the rotating sleeve is sleeved on the rotating roller.

Preferably, the rotary driving mechanism is located between the screwdriver head and the screwdriver head sleeve seat, the rotary driving mechanism comprises a side limiting groove and a side limiting protrusion, the side limiting groove and the side limiting protrusion can only slide back and forth relatively and are respectively arranged in an inner hole of the screwdriver head sleeve seat and on the side face of the screwdriver head, and the side limiting protrusion is arranged in the side limiting groove.

Preferably, the rotation driving mechanism is located between the screwdriver head and the ejector rod and comprises an end limiting groove and an end limiting protrusion, the end limiting groove and the end limiting protrusion are respectively arranged on the contact surface of the ejector rod and the screwdriver head, and the end limiting protrusion is arranged in the end limiting groove.

Preferably, the device also comprises a driving motor, and the lower end of the ejector rod is in transmission connection with a rotating shaft of the driving motor.

Preferably, a partition plate is arranged between the rotary rollers on the rotary seat, and a second through hole for allowing the rotary cylinder shaft to pass through is formed in the partition plate.

Preferably, the lower end of the screwdriver head is provided with a first limiting protrusion, and a second limiting protrusion used for limiting the first limiting protrusion to pass through is arranged inside the upper end of the screwdriver head sleeve seat.

Preferably, the lower end of the ejector rod is rotatably provided with a positioning sleeve, the positioning sleeve is provided with a first connecting thread, the lower end of the rotating cylinder shaft is provided with a second connecting thread, and the second connecting thread is meshed with the first connecting thread.

The invention has the beneficial effects that: according to the screwdriver, the screwdriver head is arranged inside the screwdriver body, so that the screwdriver head can be replaced under the condition that the screwdriver body and the screwdriver are not separated, the screwdriver head is convenient and efficient to replace, and meanwhile, the screwdriver head is not easy to lose; by arranging the plurality of rotating rollers, more screwdriver bits can be stored in the screwdriver, the normal use of the screwdriver is not influenced, and the screwdriver is convenient to use and flexible to apply; through set up the structure that restriction screwdriver head followed complete roll-off in screwdriver head cover barrel holder on screwdriver head and screwdriver head barrel holder, can prevent absolutely that screwdriver head from losing, easy operation, convenience simultaneously.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings in which like reference characters refer to like features throughout and in which:

FIG. 1 is a top view of a center channel screwdriver bit anti-lost interior screwdriver of the present invention;

FIG. 2 is a front view of a center channel screwdriver bit anti-lost interior screwdriver of the present invention;

FIG. 3 is a right side view of a center channel screwdriver bit anti-lost interior screwdriver of the present invention;

FIG. 4 is a perspective view of a center channel screwdriver bit anti-lost interior screwdriver of the present invention;

FIG. 5 is an exploded view of a center channel screwdriver bit anti-lost interior screwdriver of the present invention;

FIG. 6 is an exploded view of a center channel driver bit anti-lost interior screwdriver with a retaining nut of the present invention;

FIG. 7 is a perspective view of the rotary drum shaft;

FIG. 8 is a top cross-sectional view of a rotating roller;

fig. 9 is an exploded view of a center channel screwdriver bit anti-lost interior screwdriver with a drive motor of the present invention.

In the figure: 1-rotating seat, 101-rotating cylinder shaft, 1011-third channel hole, 102-upper limiting plate, 103-lower limiting plate, 104-rotating sleeve, 105-clapboard, 2-rotating roller, 21-screwdriver bit storage chamber, 23-screwdriver bit inlet and outlet, 26-rotating shaft hole, 3-ejector rod, 31-ejector rod channel hole, 32-positioning sleeve, 42-screwdriver bit sleeve seat, 6-screwdriver bit and 7-driving motor.

Detailed Description

First embodiment, referring to fig. 1 to 5 and fig. 7 to 8, an anti-lost built-in screwdriver for a center channel screwdriver bit according to the present invention comprises a rotary base 1, a rotary roller 2, a screwdriver bit 6, a screwdriver bit sleeve base 42 and a rotation driving mechanism for driving the screwdriver bit 6 to rotate;

the rotating base 1 comprises a rotating cylinder shaft 101, an upper limiting plate 102 and a lower limiting plate 103, the upper limiting plate 102 is fixedly arranged at the upper end of the rotating cylinder shaft 101, the lower limiting plate 103 is fixedly arranged at the lower end of the rotating cylinder shaft 101, the rotating roller 2 is positioned between the upper limiting plate 102 and the lower limiting plate 103, a rotating shaft hole 26 is formed in the rotating roller 2, the rotating cylinder shaft 101 penetrates through the rotating shaft hole 26, an ejector rod channel hole 31 is formed in the rotating cylinder shaft 101, the upper limiting plate 102 and the lower limiting plate 103 limit the vertical sliding motion of the rotating roller 2, the rotating roller 2 is limited in the front-back and left-right directions by the rotating cylinder shaft 101 penetrating through the rotating roller 2, so that the rotating roller 2 can only rotate on the rotating cylinder shaft 101, and the purpose that screwdriver bits 6 on different rotating rollers 2 enter the screwdriver head sleeve base 42 through the ejector rod channel holes 31 in turn is achieved by rotation;

at least two rotating rollers 2 which rotate coaxially are arranged on the rotating cylinder shaft 101;

the upper end of the rotating cylinder shaft 101 is provided with a screwdriver head sleeve cylinder seat 42 communicated with the mandril channel hole 31;

the ejector rod channel hole 31 is internally provided with an ejector rod 3 for ejecting the screwdriver head 6 in the rotary cylinder shaft 101 into the screwdriver head sleeve seat 42;

it is provided with screwdriver head storeroom 21 to revolve shaft hole 26 and be cyclic annular arrangement on rotatory roller 2, screwdriver head storeroom 21 is provided with screwdriver head exit 23 that supplies screwdriver head 6 to pass through towards one side of rotatory bobbin shaft 101, be provided with screwdriver head 6 in the screwdriver head storeroom 21, be provided with the third via 1011 that makes screwdriver head storeroom 21 and ejector pin via hole 31 communicate on the rotatory bobbin shaft 101, be provided with the closing plate that is used for blockking up third via hole 1011 between screwdriver head storeroom 21, screwdriver head storeroom 21 is used for storing screwdriver head 6, and screwdriver head storeroom 21 quantity is more, and screwdriver head 6 that can store is more. When a screwdriver head 6 on a certain rotary roller 2 is needed in the using process, the rotary roller 2 is rotated to enable the needed screwdriver head 6 to be opposite to a third channel hole 1011, other rotary rollers 2 are rotated to enable a sealing plate on other rotary rollers 2 to be opposite to the third channel hole 1011, then the ejector rod 3 is pulled out, the needed screwdriver head 6 enters the ejector rod channel hole 31 through the screwdriver head inlet/outlet 23 and the third channel hole 1011 under the action of gravity, the other rotary rollers 2 face the third channel hole 1011 because of the sealing plate, so the screwdriver heads 6 on other rotary rollers 2 cannot enter the ejector rod channel hole 31 through the third channel hole 1011, the needed screwdriver head 6 enters the ejector rod channel hole 31, the ejector rod 3 is inserted, the screwdriver head 6 is jacked into the screwdriver head sleeve seat 42 through the ejector rod 3, the screwdriver head 6 is jacked through the ejector rod 3 in the screwing process, the screwdriver head 6 is driven to rotate through the ejector rod 3 or the screwdriver head sleeve seat 42, by assembling and disassembling screws at the end of the screwdriver bit 6 extending from the upper end of the screwdriver bit socket 42, after the screwdriver bit 6 is used, the screwdriver bit 6 slides to the third channel hole 1011 corresponding to the rotary roller 2 under the action of gravity, and the screwdriver bit 6 falls into the screwdriver bit storage chamber 21 under the action of gravity, when the screwdriver bit 6 enters the screwdriver bit storage chamber 21, the sealing plate faces the third channel hole 1011 by rotating the rotary roller 2, then the ejector rod 3 is inserted into the ejector rod channel hole 31, and at this time, even if the screwdriver bit 6 is aligned with the third channel hole 1011, the screwdriver bit 6 cannot enter the ejector rod channel hole 31.

In order to conveniently identify different screwdriver bits 6, the type or shape marks of the screwdriver bits 6 can be arranged on the outer side of the screwdriver bit storage chamber 21, so that people can conveniently select different sizes and types of screwdriver bits 6 corresponding to screws with different sizes, and the rotating roller 2 can also be made of transparent materials; a see-through hole may be provided in the rotary roller 2 through which the screwdriver bit 6 provided in the screwdriver bit storage chamber 21 is viewed; because the types of the screwdriver heads 6 are more, the screwdriver head storage chamber 21 is used for storing the screwdriver heads 6 of different types so as to meet the assembling and disassembling requirements of screws of different types;

in order to enable the ejector rod 3 to drive the screwdriver head 6 to slide between the rotating roller 2 and the screwdriver head sleeve seat 42 in a reciprocating manner, magnetic force can be arranged at the upper end of the ejector rod 3, and if no magnetic force is arranged, when the screwdriver head 6 needs to return to the rotating roller 2, gravity can be used;

a rotary driving mechanism for driving the screwdriver head 6 to rotate is arranged between the screwdriver head sleeve seat 42 and the screwdriver head 6 or between the ejector rod 3 and the screwdriver head 6, when the rotary driving mechanism is arranged between the screwdriver head sleeve seat 42 and the screwdriver head 6, the screwdriver head 6 is driven to rotate through the screwdriver head sleeve seat 42, the rotary seat 1 is manually rotated in the use process of the screwdriver, the screwdriver head sleeve seat 42 is driven to rotate through the rotary seat 1, and a screw is screwed through the screwdriver head 6 in the screwdriver head sleeve seat 42; when the rotation driving mechanism is arranged between the ejector rod 3 and the screwdriver head 6, the ejector rod 3 drives the screwdriver head 6 to rotate, the ejector rod 3 is driven to rotate through manually rotating the rotating seat 1 in the application process of the screwdriver, or the ejector rod 3 is directly and manually rotated, the screwdriver head 6 is driven to rotate through the ejector rod 3, and screws are assembled and disassembled through the screwdriver head 6.

As shown in fig. 2-5, 3 rotating rollers 2 may be coaxially disposed on the rotating cylinder shaft 101, and the larger the number of the rotating rollers 2, the larger the number of the screwdriver bits 6 that can be stored, but the longer the total length of the screwdriver, so the specific number of the rotating rollers 2 is selected according to the requirement.

The rotary driving mechanism is positioned between the screwdriver head 6 and the screwdriver head sleeve seat 42, the rotary driving mechanism comprises a side limiting groove and a side limiting bulge which can only slide relatively back and forth and are respectively arranged in the inner hole of the screwdriver head sleeve seat 42 and on the side surface of the screwdriver head 6, the side limiting bulge is arranged in the side limiting groove, the side limiting bulge can only slide up and down in the side limiting groove and can not rotate, in the application process of the screwdriver, the rotary seat 1 is manually rotated to drive the screwdriver head sleeve seat 42 to rotate, the screwdriver head sleeve seat 42 drives the screwdriver head 6 to rotate, screws are screwed through the screwdriver head 6, in order to ensure that the side limiting groove and the side limiting bulge can only slide up and down mutually, the relative rotation can not be realized, the cross section of the inner hole of the screwdriver head sleeve seat 42 can have various shapes, and the rotary driving mechanism can be hexagonal, quadrangular or elliptical, the cross section of the corresponding screwdriver head 6 is hexagonal, quadrangular or elliptical, and no matter what the cross section of the inner hole of the screwdriver head sleeve seat 42 and the cross section of the screwdriver head 6 are, the screwdriver head sleeve seat 42 can drive the screwdriver head 6 to rotate.

Second embodiment, based on the above embodiments, as shown in fig. 5, in order to facilitate holding the screwdriver by hand, a rotating sleeve 104 may be added to the rotating base 1, the rotating sleeve 104 is fixedly disposed on the lower limiting plate 103 or/and the upper limiting plate 102, the rotating sleeve 104 is sleeved on the rotating roller 2, and the rotating roller 2 is partially wrapped by the rotating sleeve 104, so as to facilitate holding the rotating base 1 by hand during use of the screwdriver, of course, if there is no rotating sleeve 104, the purpose of screwing screws can be achieved by directly rotating the lower limiting plate 103 and the upper limiting plate 102 or the ejector rod 3 during use of the screwdriver, and in order to enable the rotating sleeve 104 to be well fixed, the strength of holding the screws by hand is good, and the rotating sleeve 104 can be fixed on the lower limiting plate 103 and the upper limiting plate 102.

Third embodiment, this embodiment is based on the above embodiments, and is obtained by replacing the rotation driving mechanism in the above embodiments with the rotation driving mechanism structure in this embodiment, the rotation driving mechanism is located between the screwdriver head 6 and the ejector rod 3, the rotation driving mechanism includes an end limiting groove and an end limiting protrusion, the end limiting groove and the end limiting protrusion are respectively disposed on the contact surfaces of the ejector rod 3 and the screwdriver head 6, the end limiting protrusion is disposed in the end limiting groove, the lower end of the screwdriver head 6 in the screwdriver head socket 42 is abutted against the upper end of the ejector rod 3, the end limiting groove and the end limiting protrusion are respectively disposed on the contact surfaces of the screwdriver head 6 and the ejector rod 3, the ejector rod 3 and the screwdriver head 6 are rotatably and drivingly connected through the end limiting groove and the end limiting protrusion, so that the ejector rod 3 can drive the screwdriver head 6 to rotate, the cross section of the end limiting groove can have various shapes, the cross section of the corresponding end limiting bulge can be hexagonal, quadrangular or elliptical, and no matter what the cross section of the end limiting bulge and the cross section of the end limiting groove are, the rotating seat 1 can finally drive the screwdriver bit 6 to rotate.

In a fourth embodiment, based on the third embodiment, as shown in fig. 9, in order to more efficiently assemble and disassemble the screw, a driving motor 7 may be added, the lower end of the ejector rod 3 is in transmission connection with a rotating shaft of the driving motor 7, the driving motor 7 may be fixed by holding a hand, the ejector rod 3 is driven to rotate by holding the motor, the screwdriver bit 6 is driven to rotate by the ejector rod 3, and the screw to be screwed is driven to rotate by the screwdriver bit 6; the driving motor 7 can be fixed on the rotating base 1, gears are respectively arranged on the lower end of the ejector rod 3 and the rotating shaft of the driving motor 7, the driving motor 7 drives the ejector rod 3 to rotate through the mutual meshing transmission of the gears, the ejector rod 3 drives the screwdriver head 6 to rotate, the screwdriver head 6 drives a screw to be screwed to rotate, and the ejector rod 3 can be pulled out through the separating gear during the mutual meshing transmission of the gears.

Fifth embodiment, this embodiment is based on the above-mentioned embodiment, as shown in fig. 5, in order to make the rotation of the rotary roller 2 easier and more convenient, a partition 105 may be disposed on the rotary base 1 between the rotary rollers 2, the partition 105 is provided with a second through hole for the rotary drum shaft 101 to pass through, because of the plurality of rotary rollers 2, when the screwdriver bit 6 of a certain model is needed, the corresponding rotary roller 2 needs to be rotated independently, if there is no partition 105, the rotary rollers 2 can be driven by mutual friction, the rotary roller 2 which does not need to be rotated needs to be manually stopped to rotate, the operation is more troublesome, the different rotary rollers 2 are separated by the partition 105, meanwhile, a certain gap is reserved between the partition 105 and the rotary roller 2, when a certain rotary roller 2 is rotated independently, the resistance is smaller, and the rotation is easier.

Sixth embodiment, this embodiment is based on the above-mentioned embodiment, in order to make screwdriver bit 6 unable easy and screwdriver separation, can be in screwdriver bit 6 lower extreme is provided with first spacing arch, inside being provided with of screwdriver bit sleeve seat 42 upper end is used for restricting the first spacing protruding second spacing arch that passes through, through setting up second spacing arch and first spacing arch, makes screwdriver bit 6 stretch out from screwdriver head cover barrel seat 42 upper end, and the lower extreme is stayed in screwdriver bit sleeve seat 42 simultaneously, and can't be easily artificial to extract, thoroughly prevents screwdriver bit 6 and screwdriver body separation, does not separate nature screwdriver bit 6 and also can not lose.

Seventh embodiment, this embodiment is based on the above-mentioned embodiment, as shown in fig. 6, in order to make it unnecessary to push the top bar 3 by hand during screwing, a positioning sleeve 32 can be rotatably arranged at the lower end of the mandril 3, a first connecting thread is arranged on the positioning sleeve 32, the lower end of the rotary cylinder shaft 101 is provided with a second connection thread, which is engaged with the first connection thread, by fixing the position fixing sleeve 32 at the lower end of the rotary cylinder shaft 101 by means of a thread, the up-down sliding direction of the ejector rod 3 can be limited, the ejector rod 3 does not need to be jacked by hands in the process of screwing screws, the ejector rod 3 is prevented from sliding out of the ejector rod channel hole 31, the ejector rod 3 penetrates through the positioning sleeve 32, the positioning sleeve 32 can only rotate relative to the ejector rod 3 and cannot slide up and down, the retainer sleeve 32 is fixed to the lower end of the rotary cylinder shaft 101 by rotating the retainer sleeve 32.

The working process of the invention is as follows:

in the working process of the built-in screwdriver with the loss-proof central channel screwdriver bit, when the screwdriver is in a storage state, the ejector rod 3 is arranged in the rotary cylinder shaft 101, all the screwdriver bits 6 are arranged in the screwdriver bit storage chamber 21, and the screwdriver bits 6 cannot enter the ejector rod channel hole 31 in the rotary cylinder shaft 101 because the ejector rod 3 is arranged in the rotary cylinder shaft 101. When a screwdriver needs to screw by using a screwdriver bit 6 of a certain model, a rotary roller 2 containing the screwdriver bit 6 is found, the rotary roller 2 is rotated to enable the screwdriver bit 6 to be opposite to a third channel hole 1011, other rotary rollers 2 are rotated to enable a sealing plate on other rotary rollers 2 to be opposite to the third channel hole 1011, then the ejector rod 3 is pulled out, the screwdriver bit 6 to be required enters the ejector rod channel hole 31 through the screwdriver bit inlet/outlet 23 and the third channel hole 1011 under the action of gravity, the other rotary rollers 2 enable the screwdriver bits 6 on other rotary rollers 2 to be opposite to the third channel hole 1011 because of the sealing plate, the screwdriver bit 6 on other rotary rollers 2 cannot enter the ejector rod channel hole 31 through the third channel hole 1011, the screwdriver bit 6 to be required enters the ejector rod channel hole 31, the ejector rod 3 is inserted, the screwdriver bit 6 is ejected into the screwdriver bit sleeve seat 42 through the ejector rod 3, and the positioning sleeve 32 can be fixed at the lower end of the rotary cylinder shaft 101 by rotating the positioning sleeve 32, in the process of screwing the screw, the ejector rod 3 does not need to be jacked by a hand, the screwdriver head 6 is jacked by the ejector rod 3, the screwdriver head 6 is driven to rotate by the ejector rod 3 or the screwdriver head sleeve seat 42, the screw is assembled and disassembled by the end part of the screwdriver head 6 extending out of the upper end of the screwdriver head sleeve seat 42, after the screwdriver head 6 is used, the screwdriver head 6 slides to the third channel hole 1011 corresponding to the rotary roller 2 through the action of gravity, the screwdriver head 6 falls into the screwdriver head storage chamber 21 through the gravity, after the screwdriver head 6 enters the screwdriver head storage chamber 21, the sealing plate faces the third channel hole 1011 through the rotation of the rotary roller 2, then the ejector rod 3 is inserted into the ejector rod channel hole 31, and at this time, even if the screwdriver head 6 is aligned with the third channel hole 1011, the screwdriver head 6 cannot enter the ejector rod channel hole 31.

When being provided with first spacing arch at screwdriver bit 6 lower extreme, when being provided with the spacing arch of second that is used for restricting spacing protruding and pass through in screwdriver head cover cylinder base 42 upper end inside, through setting up the spacing arch of second and first spacing arch, make screwdriver bit 6 stretch out from screwdriver head cover cylinder base 42 upper end, the lower extreme is stayed in screwdriver bit cylinder base 42 simultaneously, and can't artificially extract easily, thoroughly prevent screwdriver bit 6 and screwdriver body separation, do not separate nature screwdriver bit 6 and just can not lose yet.

According to the built-in screwdriver with the anti-lost screwdriver bit of the central channel, the screwdriver bit 6 is arranged inside the screwdriver body, so that the work of replacing the screwdriver bit 6 can be completed under the state that the screwdriver body and the screwdriver are not separated, the screwdriver bit 6 is convenient and efficient to replace, and meanwhile, the screwdriver bit 6 is not easy to lose; by arranging the plurality of rotating rollers 2, more screwdriver bits 6 can be stored in the screwdriver, the normal use of the screwdriver is not influenced, and the screwdriver is convenient to use and flexible to apply; the screwdriver head 6 can be absolutely prevented from being lost by arranging the structure for limiting the screwdriver head 6 to completely slide out of the screwdriver head sleeve seat 42 on the screwdriver head 6 and the screwdriver head sleeve seat 42, when the structure for limiting the screwdriver head 6 to completely slide out of the screwdriver head sleeve seat 42 is not arranged, the screwdriver head 6 does not need to be pulled out of the screwdriver head sleeve seat 42 during use of the screwdriver, and if the screwdriver head 6 is intentionally pulled out manually, the intentional loss of the screwdriver head 6 cannot be avoided; as long as the user of the screwdriver normally uses and operates, the screwdriver head 6 is not pulled out of the screwdriver head sleeve seat 42, the screwdriver head 6 can be basically prevented from being lost, and the operation is simple and convenient.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.