CN106002857B - A kind of attachment means of quick-replaceable work head - Google Patents

Abstract

The invention discloses a connecting device for quickly replacing a working head, which is used for connecting with a working head (4) with an inner hole convex rib (8), and is characterized in that it includes a fixing device capable of being inserted into the working head (4). Rotary sleeve (2), and the drive shaft (1) used to fit in the fixed rotary sleeve (2); the outer wall of the fixed rotary sleeve (2) is provided with at least one groove that can cooperate with the inner hole convex rib (8) , the groove surface (2.1) of the groove is processed with a radial through hole (2.5), and a locking piece is movable in the through hole (2.5); the driving shaft (1) is processed with a locking working surface (1.2) and a release Working face (1.1). The beneficial effects of the present invention are: the locking device is kinematically associated with the operation of the machine, and the working head can be driven to work only when the working head is in the locked state, so the possibility of locking failure during operation is fundamentally eliminated.

Description

A connection device for quickly changing working heads

technical field

The invention belongs to the technical field of electric tools, and in particular relates to a connecting device for quickly replacing a working head.

Background technique

Rotary tools with attached working head on the market, because there are many types of supporting working heads, they often need to be replaced in order to apply different working environments and objects. The traditional screw + wrench fixed replacement method is cumbersome, time-consuming, and inconvenient for the operator. low efficiency.

The application number is "201380063983.7", and the invention title is "shaft for rotationally coupling the main device and the tubular device", which discloses a shaft for connecting the main device and the tubular device. In this invention, the main device is connected with the tubular device through a shaft, and the locked connection is realized through axial assembly and sequential fit during the connection process. The receiving part of the main device can drive the shaft to rotate, and then meet the use requirements. However, since the operating state is rotating around the axis, while the locking device is assembled along the axial direction, it can be seen that there is no kinematic relationship between the two. When the locking device is subjected to an external force from the axial direction, it is very easy to cause locking failure, thereby causing the danger of the working head falling off during work. In addition, the structure of the related connectors in this invention is relatively complicated, which increases the processing difficulty and production cost.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a connecting device for quick replacement of the working head, so that the locking device is kinematically associated with the operation of the machine. Only when the working head is in the locked state can the working head be driven and work, so the possibility of locking failure during operation is fundamentally eliminated.

In order to solve the problems in the prior art, the present invention discloses a connecting device for quickly replacing the working head, which is used for connecting with the working head with inner hole convex ribs, including a fixed rotating sleeve that can be inserted into the working head, and used for The drive shaft is set in the fixed rotary sleeve; the outer wall of the fixed rotary sleeve is provided with at least one groove that can match the rib of the inner hole. The groove surface of the groove is processed with a radial through hole, and a lock is movable in the through hole. The locking part; the drive shaft is processed with a locking working surface and a releasing working surface with different sizes from the axis. When the drive shaft rotates, the locking part and the locking working surface are in contact with the locking working surface at a position far away from the axis to achieve locking. The contact between the release part and the release working surface is at a position closer to the axis to realize unlocking; the fixed rotary sleeve and the drive shaft are connected by an elastic tension member, and the elastic tension member can hold the fixed rotary sleeve and the drive shaft in a locked state. Applying a circumferential force prevents unlocking.

Preferably, the elastic tension member is a torsion spring, the front end of the torsion spring is connected to the rear end of the fixed rotating sleeve, and the rear end is connected to the drive shaft.

Preferably, the rear end of the fixed rotating sleeve is provided with two limiting parts, and a locking pin is arranged on the drive shaft, and the front end of the torsion spring abuts against the side of one of the limiting parts, and the locking pin can be locked with the other when it is locked. The side of a limiting part abuts to transmit torque.

Preferably, the number of grooves is four, and a radial through hole is processed on the groove surface of at least one of the grooves; the part between the grooves on the fixed rotary sleeve is used as the bearing surface and the inner hole wall of the working head match.

Preferably, the groove surface of the groove is plane and perpendicular to its side wall.

Preferably, the locking working surface and the releasing working surface are planes perpendicular to each other, and the connection between them is rounded.

Preferably, the locking member is a steel ball or a steel pin.

Preferably, a circlip is further included. The front end of the drive shaft protrudes from the front end of the fixed rotary sleeve and the circlip is installed to prevent the fixed rotary sleeve from being separated from the drive shaft axially.

The invention also discloses an electric tool, which includes a driving unit and the above-mentioned connecting device, the driving unit is connected with the driving shaft in the connecting device and drives it to rotate.

The beneficial effect that the present invention has:

1. There is a kinematic relationship between the locking device and the operation of the machine. Only when the working head is in the locked state can the working head be driven to work, so the possibility of locking failure during operation is fundamentally eliminated.

2. The torsion spring is used as the tensioning part, so that the fixed rotary sleeve and the drive shaft can be tensioned by the elastic force of the torsion spring when there is no human manipulation, so as to ensure that the working head can be kept locked even in the non-operating state.

3. Through the function of the lock pin and the limit part, the drive shaft can better transmit the torque and drive the working head to rotate.

4. A plurality of grooves are evenly distributed in the circumferential direction and matched with the convex ribs of the inner hole one by one to produce a key fit effect, which enhances the firmness of the connection on the one hand, and meets the dynamic balance requirements on the other hand to prevent eccentric vibration.

5. The connection between the locking working surface and the releasing working surface is processed with a round chamfer, so that the locking member can better switch the contact surface during the rotation of the drive shaft, so as to quickly realize locking or unlocking.

6. The use of the circlip avoids the axial movement of the drive shaft and the fixed rotary sleeve during operation and thus separates each other, resulting in transmission failure.

Description of drawings

Fig. 1 is the overall structural diagram of electric tool among the present invention;

Fig. 2 is the assembly schematic diagram of connecting device among the present invention;

Fig. 3 is an exploded schematic view of the connecting device in the present invention;

Fig. 4 is a perspective view of the unlocked state of the connecting device in the present invention;

Fig. 5 is a radial view of the unlocked state of the connecting device in the present invention;

Fig. 6 is an axial view in the unlocked state of the connecting device in the present invention;

Fig. 7 is a perspective view of the locking state of the connecting device in the present invention;

Fig. 8 is a radial view of the locking state of the connecting device in the present invention;

Fig. 9 is an axial view of the connection device in the locked state of the present invention.

Reference signs:

1 drive shaft; 1.1 release working surface; 1.2 locking working surface; 2 fixed rotating sleeve; 2.1 groove surface; 2.2 side wall; 2.3 first limit part; 2.4 second limit part; 4 working head; 5 lock pin; 6 torsion spring; 7 circlip; 8 convex rib in the inner hole; 9 tool casing;

detailed description

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

As shown in Figures 1 to 3, an electric tool 10 includes a tool casing 9 and a motor installed in the tool casing 9, a reduction mechanism, a switch, etc., wherein the output end of the drive unit formed by the motor and the reduction mechanism is connected to a Connect the device.

The connection device is used to connect with the working head 4 with the inner hole convex rib 8, which includes a fixed rotary sleeve 2 that can be inserted into the working head 4, and a drive shaft that is sleeved in the fixed rotary sleeve 2 to provide rotational power 1.

The outer wall of the fixed rotary sleeve 2 is evenly provided with four grooves in the circumferential direction that can cooperate with the ribs 8 of the inner hole. The groove surface 2.1 of the groove is processed with a radial through hole 2.5, and a locking piece is movable in the through hole 2.5. . The groove surface 2.1 of the groove is a plane and is perpendicular to its side wall 2.2, and the part between the grooves cooperates with the inner hole wall of the working head 4 as a supporting surface.

The driving shaft 1 is processed with a locking working surface 1.2 and a releasing working surface 1.1. The distance between the locking working surface 1.2 and the axis center is greater than the distance between the releasing working surface 1.1 and the axis center, so that the two working surfaces are in contact with the locking parts respectively. It can be pushed up and down in the through hole 2.5, the locking working surface 1.2 and the releasing working surface 1.1 are planes perpendicular to each other, and the joints of the two are processed with rounded corners, which is convenient for the conversion of the locking parts when the drive shaft 1 rotates Contact surfaces.

The fixed rotary sleeve 2 is connected to the drive shaft 1 through an elastic tension member. The specific connection method is: the elastic tension member is a torsion spring 6, and the rear end of the fixed rotary sleeve 2 is provided with a first limiter 2.3 and a second limiter. Position part 2.4, a lock pin 5 is set on the drive shaft 1, the front end of the torsion spring 6 abuts against the side of the second limit part 2.4, and the lock pin 5 can abut against the side of the first limit part 2.3 in the locked state The torsion is transmitted directly, so that the torsion spring 6 can apply a circumferential force to the fixed rotating sleeve 2 and the drive shaft 1 in the locked state to prevent unlocking.

The front end of the drive shaft 1 protrudes from the front end of the fixed rotary sleeve 2, and a jumper 7 is installed on the extended part to prevent the fixed rotary sleeve 2 from being axially separated from the drive shaft 1.

In order to more conveniently realize the transition between the locking member and the corresponding working surface, the locking member can also be selected as a steel ball 3 or a steel pin.

Working principle and process of the present invention

Taking Fig. 1 as an example, the driving shaft 1 in the figure rotates counterclockwise, which drives the working head 4 to also rotate counterclockwise. Regardless of unlocking or locking, it is necessary to press the shaft lock button 11 to lock the drive shaft 1, and then the working head 4 can be rotated and unlocked or locked by relative rotation.

Unlock status:

As shown in Figures 4 to 6, the fixed rotary sleeve 2 is inserted into the inner hole of the working head 4, and the inner hole convex rib 8 is inserted into the corresponding groove, and the front end surface of the inner hole convex rib 8 is a limiting surface. Turn the working head 4 to change its position with the drive shaft 1 so that the steel ball 3 is in contact with the release working surface 1.1. At this time, the steel ball 3 is in a position close to the axis, and the inner hole convex rib 8 of the working head 4 passes over the steel ball. 3. The working head 4 can be fully inserted into the rotary sleeve and the main shaft, and the working head 4 is fully inserted into the working state. The installation state is very stable. At this time, the steel ball 3 does not interfere with the working head 4. In this state, the working head 4 It can be assembled and disassembled freely.

Locked state:

As shown in Figures 7 to 9, turn the working head 4 to change its position with the drive shaft 1 so that the steel ball 3 is in contact with the locking working surface 1.2. At this time, the steel ball 3 is in a position away from the axis. 3 is in contact with the front end surface on the convex rib 8 of the inner hole to realize the axial limit. At this time, the working head 4 cannot be separated from the fixed rotary sleeve 2 and the drive shaft 1 . At the same time, the rotation of the drive shaft 1 causes the lock pin 5 to abut against the side of the first limiter 2.3, and the drive shaft 1 drives the working head 4 counterclockwise through the limit relationship between the lock pin 5 and the first limiter 2.3. turn. During operation, since the locking working surface 1.2 of the drive shaft 1 is always on the steel ball 3 at this angle, so as long as the machine is running, the working head 4 will not fall off due to the locking release.

When the driving shaft 1 stops and is in the locked state, turn the working head 4 counterclockwise to change the mating surface between the driving shaft 1 and the steel ball 3, the steel ball 3 descends close to the axis, and at the same time pull the working head 4 outward, and the inside of the working head 4 The hole convex rib 8 crosses the steel ball 3 so that the working head 4 can be pulled out in the axial direction, so as to realize the disassembly of the working head 4 .

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (10)

1. a kind of attachment means of quick-replaceable work head, for with endoporus fin（8）Work head（4）Connection, it is special Sign is：Including being inserted into the head that works（4）In fixation pivoted housing（2）, and for being sleeved on fixed pivoted housing（2）In drive Moving axis（1）；Fixed pivoted housing（2）Outer wall offer it is at least one can be with endoporus fin（8）The groove being engaged, the groove face of groove （2.1）On be machined with the through hole of radial direction（2.5）, through hole（2.5）Middle activity is equipped with a lock piece；Drive shaft（1）On be machined with The different locking working face of off-axis heart size（1.2）With release working face（1.1）, drive shaft（1）During rotation, lock piece and locking Working face contact is in off-axis heart remote position so as to realize locking, and lock piece is with discharging working face（1.1）Contact be in from The nearer position in axle center unlocks so as to realize；Fixed pivoted housing（2）With drive shaft（1）Between connected by elastic tension part, elasticity Tensioner can be in the locked condition to fixed pivoted housing（2）And drive shaft（1）Applying circumferential active force prevents from unlocking.

2. the attachment means of a kind of quick-replaceable work head according to claim 1, it is characterised in that elastic tension part is Torsion spring（6）, torsion spring（6）Front end and fixed pivoted housing（2）Rear end connection, rear end and drive shaft（1）Connection.

A kind of 3. attachment means of quick-replaceable work head according to claim 2, it is characterised in that fixed pivoted housing（2） Rear end be provided with two limiting sections, drive shaft（1）One lock pin of upper setting（5）, torsion spring（6）Front end and one of limiting section Side abut, lock pin（5）It can be abutted in locking state with the side of another limiting section and transmit torsion.

4. the attachment means of a kind of quick-replaceable work head according to claim 1, it is characterised in that the quantity of groove is four It is individual, and the groove face of a groove at least in（2.1）On be machined with the through hole of radial direction（2.5）；Fixed pivoted housing（2）Upper groove and groove it Between part as bearing-surface with work head（4）Endoporus hole wall be engaged.

A kind of 5. attachment means of quick-replaceable work head according to claim 4, it is characterised in that the groove face of groove （2.1）For plane and with its side wall（2.2）Vertically.

A kind of 6. attachment means of quick-replaceable work head according to claim 1, it is characterised in that locking working face （1.2）With release working face（1.1）For orthogonal plane, both junction processing roundings.

7. the attachment means of a kind of quick-replaceable work head according to claim 1, it is characterised in that lock piece is steel ball （3）Or steel pin.

8. the attachment means of a kind of quick-replaceable work head according to claim 1, it is characterised in that also including jump ring （7）, drive shaft（1）Front end from fixed pivoted housing（2）Front end stretch out and the jump ring be installed（7）, prevent from fixing pivoted housing（2）With drive Moving axis（1）Generation axial separation.

A kind of 9. electric tool（10）, including a driver element, it is characterised in that：Also include according to any institute of claim 1 to 8 A kind of attachment means for quick-replaceable work head stated, driver element and the drive shaft in attachment means（1）Connect and drive it Rotation.

A kind of 10. electric tool according to claim 9（10）, it is characterised in that also it can lock or unclamp including one The locking button of drive shaft（11）.