CN215642447U

CN215642447U - Hand wheel capable of micro-feeding

Info

Publication number: CN215642447U
Application number: CN202121888078.3U
Authority: CN
Inventors: 龚鼎新; 陈伟
Original assignee: Shanghai New Samarium Machine Tool Co ltd
Current assignee: Shanghai New Samarium Machine Tool Co ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-01-25
Anticipated expiration: 2031-08-09

Abstract

The utility model discloses a micro-feeding hand wheel, which comprises a hand wheel, a dial and an indexing knob, wherein: the dial is rotatably sleeved on the hand wheel, and the edge part of the hand wheel is provided with a mounting hole; the indexing knob is arranged at the mounting hole and comprises a knob, a connecting shaft fixedly connected with the knob and a driving gear fixedly connected with the connecting shaft; a locking mechanism is arranged between the indexing knob and the hand wheel; the dial is provided with a driven gear; the driven gear of the dial can be meshed with the driving gear of the indexing knob. The hand wheel can be used as a common hand wheel, can realize micro-feeding and is convenient to use.

Description

Hand wheel capable of micro-feeding

Technical Field

The utility model belongs to the field of feed adjusting devices, and particularly relates to a micro-feeding hand wheel.

Background

The feeding hand wheel is a transmission device for adjusting the position of a workpiece. For example, when the existing ordinary hand wheel directly drives the screw rod to rotate, the nut on the screw rod moves by one thread pitch when the hand wheel rotates by one turn.

The hand wheel can be provided with an indexing line, and the minute feeding can be realized by visual alignment of a zero line and the scale line for indexing. However, the repeatability of the above-mentioned micro-feeding depends mainly on the visual angle and the accuracy of each visual, requires the operation experience of workers, and inevitably introduces errors. In addition, to obtain smaller scale values, the number of lines on the circumference is increased, and excessively dense lines may cause difficulty in recognition.

SUMMERY OF THE UTILITY MODEL

The utility model provides a micro-feeding hand wheel, aiming at overcoming the defects that the existing hand wheel is difficult to realize accurate micro-feeding and graduation marks cannot be excessively dense.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a micro-feedable hand wheel comprising a hand wheel, a dial and an indexing knob, wherein:

the middle part of the hand wheel is provided with a connecting part protruding towards one side, the dial is rotatably sleeved on the outer side of the connecting part, and the edge part of the hand wheel is provided with a mounting hole;

the indexing knob comprises a knob, a connecting shaft fixedly connected with the knob and a driving gear fixedly connected with the connecting shaft, wherein the connecting shaft or a part of the connecting shaft and the driving gear of the indexing knob are sleeved in the mounting hole of the hand wheel; a positioning hole is formed in the inner side face of a knob of the indexing knob, and a positioning column used for being abutted against the positioning hole is arranged on the side face of the edge part of the hand wheel;

the dial is provided with a driven gear;

when the driven gear of the dial is meshed with the driving gear of the indexing knob, the dial and the hand wheel are locked together, meanwhile, the positioning column is withdrawn from the positioning hole, and the dial is driven to rotate when the indexing knob rotates;

when the driven gear of the dial is disengaged from the driving gear of the indexing knob, the dial and the hand wheel are unlocked, and the dial can rotate independently.

Preferably, a groove is formed in a side face, close to the edge portion of the hand wheel, of the dial, and the driven gear is connected to a side wall of the groove.

Preferably, a plurality of notches are formed in the connecting portion of the hand wheel, a compression spring is arranged in each notch, and a ball is arranged on the outer side of each compression spring;

the dial is provided with a circle of annular limiting grooves;

the compression spring pushes the ball part into the limit groove.

Furthermore, the dial is provided with a stop pin for realizing limiting by matching with a reversible stop block arranged on the machine tool.

Furthermore, the inner side of the opening at one side of the mounting hole, which is close to the indexing knob, is provided with a first limiting step, the joint of the connecting shaft of the indexing knob and the driving gear is provided with a second limiting step, the outer side of the connecting shaft is further sleeved with a spring, and two ends of the spring are respectively used for abutting against the first and second limiting steps.

Furthermore, the number of the positioning holes in the knob of the indexing knob is multiple, the positioning holes are arranged around the connecting shaft in a circle, and the included angle between any two adjacent positioning holes and the connecting shaft is a certain value alpha.

Furthermore, a connecting hole used for being connected with the screw rod is formed in the middle of the connecting portion of the hand wheel.

Furthermore, a handle is further arranged on the hand wheel.

Compared with the prior art, the utility model has the beneficial effects that:

1. the hand wheel can be used as a general hand wheel and can also realize micro-feeding.

2. After the dial and the hand wheel are unlocked, the dial can be independently rotated, and if the dial is rotated back to the zero position, the rotation amount of the hand wheel generated by rotating the indexing knob can be very conveniently observed.

3. The restoring force of the compression spring pushes the ball part into the limiting groove, so that the limiting in the axial direction of the dial is realized, and the rotation of the dial is not influenced.

4. The stop pin on the dial can be used for being matched with a stop block which can rotate properly and a fixed limit pin on the machine tool, and the stop pin can help to limit the rotating angle of the hand wheel and position the dial at a zero position.

5. The number of the positioning holes is set to be a plurality, so that quantitative feeding of unit rotation amount is realized. The rest of the advantages can be seen in the details of the examples.

Drawings

Fig. 1 is a schematic cross-sectional view of a micro-feedable handwheel of an embodiment.

Fig. 2 is a schematic view of the dial in fig. 1.

Fig. 3 is a schematic diagram of the stop pin on the dial and the stop block on the machine tool in the embodiment.

FIG. 4 is a schematic side view of an indexing knob in an embodiment.

Description of the figure numbers:

10. the hand wheel, 11, a connecting part, 12, a mounting hole, 13, a positioning column, 14, a first limiting step, 15, a connecting hole, 16, a handle, 17, a notch, 18, a compression spring and 19, and balls.

20. The scale disc, 21, the driven gear, 22, the groove, 23, the stop pin and 24, the limiting groove.

30. An indexing knob 31, a knob 310, a positioning hole 32, a connecting shaft 33, a driving gear 34, a second limiting step 35 and a spring.

40. Stop block, 41, limit pin.

Detailed Description

The utility model is further described below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the micro-feedable hand wheel of the present embodiment includes a hand wheel 10, a dial 20, and an index knob 30.

The middle part of the hand wheel 10 is provided with a connecting part 11 protruding towards one side, and the dial 20 is rotatably sleeved on the outer side of the connecting part 11; the edge of the hand wheel 10 is provided with a mounting hole 12 for mounting the index knob 30.

The index knob 30 includes a knob 31, a connecting shaft 32 fixedly connected to the knob 31, and a driving gear 33 fixedly connected to the connecting shaft 32, wherein the connecting shaft 32 or a portion of the connecting shaft 32 and the driving gear 33 of the index knob 30 is sleeved in the mounting hole 12 of the handwheel 10.

A positioning hole 310 is formed in an inner side surface of the knob 31 of the index knob 30, and a positioning post 13 for abutting against the positioning hole 310 is formed in a side surface of an edge portion of the hand wheel 10.

The dial 20 is provided with a driven gear 21, and the driven gear 21 is engaged with or disengaged from a driving gear 33 of the index knob 30.

When the driven gear 21 of the dial 20 is engaged with the driving gear 33 of the index knob 30, the positioning column 13 is pushed into the positioning hole 310, so as to lock the dial 20 and the hand wheel 10 together.

If the hand wheel is used as a general hand wheel, the hand wheel 10 is directly rotated, and the scale line on the outer circumference of the dial 20 is observed to observe the rotation angle.

When the driven gear 21 of the scale 20 is disengaged from the driving gear 33 of the index knob 30, the index knob 30 is pulled out to the right, and referring to the direction shown in fig. 1, the positioning column 13 is also withdrawn to the right from the positioning hole 310 by a certain distance, the lock between the scale 20 and the hand wheel 10 is released, the scale 20 can be rotated independently, at this time, the scale 20 can be rotated back to the zero position, that is, the stop pin 23 on the scale 20 is abutted against the stop block 40 on the machine tool, so as to perform the next micro-feeding.

If micro-feeding is required at a certain position, such as the zero position mentioned above, the indexing knob is slightly pulled out to only disengage the positioning hole 310 from the positioning column 13, the indexing knob 30 is rotated, the indexing knob 30 is meshed with the dial 20 for transmission, and the dial 20 is further driven to retract on the hand wheel 10 by a slight angle, namely, the stop pin 23 on the dial 20 is separated from the stop block 40 on the machine tool and retracts by a slight angle, the indexing knob is inserted to enable the positioning hole 310 to be meshed with the positioning column 13 and the dial 20 to be restored to be integrated with the hand wheel 10, and then the hand wheel 10 is rotated, so that the hand wheel 10 can obtain a slight rotation, namely, the stop pin 23 on the dial 20 is enabled to be abutted against the stop block 40 on the machine tool again. Wherein a suitable transmission ratio is set as required.

As shown in fig. 2, it is preferable that a groove 22 is formed on a side surface of the scale plate 20 adjacent to the edge portion of the hand wheel 10, and the driven gear 21 is connected to a side wall of the groove 22 to form an internal gear structure, so that the master and slave gears 33 and 21 are engaged with each other and hidden in an internal space defined by the scale plate 20 and the hand wheel 10.

Preferably, a plurality of notches 17 are formed in the connecting portion 11 of the hand wheel 10, a compression spring 18 is arranged in each notch 17, and a ball 19 is arranged on the outer side of each compression spring 18; the dial 20 is provided with a ring of annular limiting grooves 24, when the dial 20 is sleeved outside the connecting part 11, the limiting grooves 24 are aligned with the balls 19, so that the restoring force of the compression spring 18 partially pushes the balls 19 into the limiting grooves 24, the dial 20 is limited in the left and right directions, namely, the dial 20 is limited in the axial direction, and the dial 20 is not influenced to rotate.

Referring to fig. 3, a stop pin 23 is further provided on the dial plate 20. A rotatable stop block 40 and a fixed stop pin 41 are provided on a machine tool (not shown), wherein the stop pin 41 is located on the lower side of the stop block 40 to prevent the stop block 40 from rotating clockwise and counterclockwise, so that the stop block 40 can only swing within a certain range.

When the stop block 40 is turned over to the outer circumference of the dial 20 counterclockwise, at this time, the hand wheel 10 is rotated clockwise, so that the stop pin 23 on the dial 20 is rotated to the position shown in the figure, i.e. is abutted against the stop block 40, and the hand wheel 10 cannot rotate clockwise continuously but can rotate counterclockwise; if rotated clockwise again, the hand wheel 10 is blocked from rotation in the same position. The method can ensure the consistency of the forward-to-position positions in multiple backward and forward processes, i.e. the method can have high repeated positioning precision. If the stopper 40 is turned clockwise as shown in the figure to the position shown by the broken line, the stopper 23 is released from the stopper 40, and the dial 20 can be arbitrarily rotated.

In use, the stop 40 acts as a limit stop to help limit the angle through which the hand wheel 10 is turned. The stop 40, in cooperation with the stop pin 23, may also be used to calibrate the zero position of the dial 20. For example, initially, the hand wheel 10 is directly rotated, and after the hand wheel approaches the target position, the index knob 30 is appropriately pulled out to unlock the positioning post and the

positioning hole

13, 310, and the main and sub gears 33, 21 are kept engaged, and the index knob 30 is rotated to perform the micro-feed. At this time, the index knob 30 is withdrawn properly, the locking state between the dial 20 and the hand wheel 10 is released, the dial 20 can be rotated independently without affecting the hand wheel 10, the dial 20 is set to the zero position, the stop pin 23 on the dial 20 is abutted against the stop block 40 on the machine tool, and then the index knob 30 is pushed in, so that the dial 20 and the hand wheel 10 are locked together. Thus, the start position of the micro-feeding is set.

Further, be equipped with first spacing step 14 in the mounting hole 12 of hand wheel 10, and first spacing step 14 locates the open-ended inboard in one side of the knob 31 that is close to graduation knob 30, the connecting axle 32 of graduation knob 30 is equipped with second spacing step 34 with the junction of driving gear 21, the outside of connecting axle 32 still overlaps and is equipped with spring 35, and the both ends of spring 35 be used for respectively with first,

second spacing step

14, 34 counterbalance. With reference to the direction shown in fig. 1, when no external force is applied, the spring 35 pushes the driving gear 33 of the index knob 30 to the left so that the driving gear 33 is engaged with the driven gear 21. The knob 31 of the index knob 30 is pulled rightward by hand, the spring 35 is compressed or further compressed, and the driving gear 33 is disengaged from the driven gear 21 to be disengaged.

As shown in fig. 4, a plurality of positioning holes 310 surrounding the connecting shaft 32 for one turn are further disposed on an inner side surface of the knob 31 of the index knob 30, and an included angle α between any two adjacent positioning holes 310 and the connecting shaft 32 is a certain value.

When the positioning post 13 is aligned with a positioning hole 310 on the knob 31 of the index knob 30, the end of the positioning post 13 can be pushed into the positioning hole 310.

If the number of the positioning holes 310 is N, the included angle α is 360 °/N. The minimum rotation included angle alpha of each rotation is one unit. Let the number of teeth of the driven gear 21 on the dial 20 be Z1 and the number of teeth of the drive gear 21 on the index knob 30 be Z2. Each time the index knob 30 is rotated by one unit, the corresponding hand wheel is rotated by an amount β ═ α (Z2/Z1).

Further, the middle part of the connecting part 11 of the hand wheel 10 is provided with a connecting hole 15 for connecting with a screw rod (not shown in the figure). The screw rod is sleeved with a screw rod nut, and the screw rod nut is used for being connected with the sliding part and limiting the screw rod nut to rotate. When the screw rod is driven to rotate by the hand wheel 10, the screw rod rotates for a circle, and the screw rod nut moves for a screw pitch along the axial direction of the screw rod. And according to the rotation quantity of the hand wheel, the displacement corresponding to feeding can be obtained. This is applied to a translational feed, and obviously the hand wheel can also be used for a rotational feed.

Further, the hand wheel 10 is provided with a handle 16 for manual operation.

The embodiments of the present invention are merely illustrative, and not restrictive, of the scope of the claims, and other substantially equivalent alternatives may occur to those skilled in the art and are within the scope of the present invention.

Claims

1. A handwheel capable of micro-feeding comprises a handwheel and a dial, and is characterized by further comprising an indexing knob, wherein:

the middle part of the hand wheel is provided with a connecting part, the dial is rotatably sleeved on the outer side of the connecting part, and the edge part of the hand wheel is provided with a mounting hole;

the indexing knob comprises a knob, a connecting shaft fixedly connected with the knob and a driving gear fixedly connected with the connecting shaft, and the connecting shaft of the indexing knob or a part of the connecting shaft and the driving gear is sleeved in the mounting hole of the hand wheel; a positioning hole is formed in a knob of the indexing knob, and a positioning column which is used for being abutted against the positioning hole is arranged on the edge of the hand wheel;

the dial is provided with a driven gear;

2. The hand wheel according to claim 1, wherein a groove is provided on a side surface of the dial adjacent to the edge portion of the hand wheel, and the driven gear is connected to a side wall of the groove.

3. The hand wheel according to claim 1, wherein a plurality of notches are provided on the connecting portion of the hand wheel, a compression spring is provided in each notch, and a ball is provided on an outer side of each compression spring;

the dial is provided with a circle of annular limiting grooves;

the compression spring pushes the ball part into the limit groove.

4. A handwheel according to claim 1, characterized in that the dial is provided with a stop pin for limiting in cooperation with a reversible stop block provided on the machine tool.

5. The hand wheel according to claim 1, wherein a first limit step is provided on the inner side of the mounting hole, a second limit step is provided at the joint of the connecting shaft of the indexing knob and the driving gear, a spring is further sleeved on the outer side of the connecting shaft, and two ends of the spring are respectively used for abutting against the first and second limit steps.

6. The hand wheel according to claim 1, wherein the number of the positioning holes on the knob of the index knob is plural, and the positioning holes are arranged around the connecting shaft by one turn, and the included angle between any two adjacent positioning holes and the connecting shaft is a certain value α.

7. The hand wheel according to claim 1, characterized in that the middle of the connecting portion of the hand wheel is provided with a connecting hole for connecting with a screw rod.

8. The hand wheel of claim 1, wherein the hand wheel is further provided with a handle.