CN215606343U - Hinge structure and viewfinder - Google Patents

Abstract

The utility model discloses a hinge structure and a viewfinder, wherein the hinge structure comprises a fixed support and a first hinge shaft; a first bearing and a second bearing are arranged on the fixed support at intervals; a first hinge shaft is supported in the first bearing and the second bearing; the first hinge shaft is hinged with a movable arm. The hinge structure eliminates the axial clearance while axially limiting; in addition, the utility model also transfers the axial adjustment amount to the abdicating gap, thereby improving the assembly precision.

Description

Hinge structure and viewfinder

Technical Field

The utility model relates to a hinge structure and a viewfinder.

Background

The minimally invasive surgery robot can reduce the physical labor of a doctor in the surgery process and achieve the aim of precise surgery. The doctor of the main knife relies on the doctor console to operate in the whole process of the operation. The doctor observes the condition of the operation through a viewfinder (optical 3D system) while operating the instrument through the master hand of the console. Different doctors require different viewing angles for surgery due to different habits of each doctor. Therefore, the tilt angle of the viewfinder needs to be adjusted. However, in order to achieve a better 3D optical effect, the viewfinder is generally arranged in a manner that optical systems are symmetrically arranged on the left and right sides, and a space for mechanical connection and pitching is only a narrow space in the middle.

Adjacent sides of the polygon are hinged, generally, a stepped shaft is combined with a clamping ring or a shaft sleeve for limiting, in order to avoid interference caused by the fact that centers are not on the same plane in each hinge processing theory, a sufficient yielding gap must be designed in the axial direction, and the yielding gap must cause the problem that abnormal sound or rigidity is insufficient at a joint.

Those skilled in the art have therefore endeavored to develop an axial clearance-free hinge structure and viewfinder.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a hinge structure and a viewfinder without axial clearance.

In order to achieve the above object, the present invention provides a hinge structure including a fixed support and a first hinge shaft; a first bearing and a second bearing are arranged on the fixed support at intervals; a first hinge shaft is supported in the first bearing and the second bearing; the first hinge shaft is hinged with a movable arm.

Preferably, a first bearing retainer ring is arranged between the first bearing and the movable arm; a second bearing retainer ring is arranged between the second bearing and the movable arm; a bearing limiting step is arranged on one side of the fixed support; the second bearing abuts against the bearing limiting step; a bearing end cover is fixed on the other side of the fixed support; the end face of the inner side of the bearing end cover abuts against the end face of the outer side of the first bearing, so that the first bearing, the first bearing retainer ring, the movable arm, the second bearing retainer ring and the second bearing are sequentially pressed.

In order to transfer the axial adjustment amount, the top of the fixed support is provided with at least one screw hole; the supporting arm is provided with a counter bore corresponding to the screw hole; and first screws are arranged in the screw holes and the counter bores so as to connect the fixed support and the support arm.

A first adjusting gap is arranged between the first screw and the counter bore.

In order to strengthen the positioning between the fixed support and the supporting arm, a first positioning surface is arranged on the supporting arm.

The utility model also provides a viewfinder which comprises the hinge structure.

The utility model has the beneficial effects that: the hinge structure eliminates the axial clearance while axially limiting; in addition, the utility model also transfers the axial adjustment amount to the abdicating gap, thereby improving the assembly precision.

Drawings

Fig. 1 is a schematic view showing a pentagonal hinge mechanism in a viewfinder according to an embodiment of the present invention.

Fig. 2 is an enlarged schematic view of a portion Q of fig. 1.

FIG. 3 is a schematic view of a viewfinder according to an embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a portion P in fig. 3.

FIG. 5 is a schematic diagram of a point B in the viewfinder, according to an embodiment of the present invention.

FIG. 6 is a schematic view of the assembly of point B in the viewfinder of an embodiment of the present invention.

FIG. 7 is a schematic view of the assembly of point C in the viewfinder of an embodiment of the present invention.

Fig. 8 is a schematic diagram of a pentagonal hinge mechanism in a viewfinder according to an embodiment of the present invention.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in fig. 1 and 2, the pentagonal hinge mechanism comprises a guide edge 1, a sliding block 2 is arranged on the guide edge 1, and a movable support 3 is arranged on the sliding block 2.

A fixed hinge joint A is arranged above the guide edge 1, a support arm 4 is hinged to the fixed hinge joint A, a fixed support 5 is arranged on the lower portion of the support arm 4, the fixed support 5 is hinged to one end of a movable arm 6, and the other end of the movable arm 6 is hinged to a movable support 3.

As shown in fig. 3 to 7, the pentagonal hinge mechanism can be applied to a viewfinder, which includes a base 7, a first mounting bracket 71 and a second mounting bracket 72 spaced apart from each other on the base 7, and the pentagonal hinge mechanism.

The first and second mounting brackets 71 and 72 are provided with a support shaft 8, and the support arm 4 is hinged to the support shaft 8, thereby forming a fixed hinge point a.

The guide edge 1 is a screw rod 9 arranged on the base 7, the screw rod 9 is driven by a motor 10, and the slide block 2 is matched with the screw rod 9 to form a screw rod nut mechanism so as to drive the slide block 2 to move on the screw rod 9.

The fixed support 5 is provided with a first bearing 11 and a second bearing 12 at intervals, a first hinge shaft 13 is supported in the first bearing 11 and the second bearing 12, and the first hinge shaft 13 is hinged with the movable arm 6.

Be provided with first bearing retaining ring 14 between first bearing 11 and the digging arm 6, be provided with second bearing retaining ring 15 between second bearing 12 and the digging arm 6, fixing support 5 one side is provided with bearing limit step 5a, second bearing 12 supports and leans on bearing limit step 5a, fixing support 5's opposite side is fixed with bearing end cover 16, bearing end cover 16's medial extremity supports and leans on the outside terminal surface of first bearing 11 to compress tightly first bearing 11 in proper order, first bearing retaining ring 14, the digging arm 6, second bearing retaining ring 15 and second bearing 12.

In this embodiment, as shown in fig. 5, when the B-point hinge joint structure is assembled, the bearing cap 16 is pressed tightly against the left side surface of the fixed support 5 by four M4 screws, the right end surface of the bearing cap 16 is pressed tightly against the outer ring of the first bearing 11, the right side of the inner ring of the first bearing 11 is pressed tightly against the first bearing retainer 14, the first bearing retainer 14 is pressed tightly against the left side surface of the movable arm 6, the right side surface of the movable arm 6 is pressed tightly against the left side surface of the second bearing retainer 15, the right side of the second bearing retainer 15 is pressed tightly against the inner ring of the second bearing 12, and the outer ring of the second bearing 12 is pressed tightly against the bearing limit step 5a, so that there is no axial gap between the fixed support 5 and the movable arm 6.

The top of the fixed support 5 is provided with at least one screw hole 5b, the support arm 4 is provided with a counter bore 4a corresponding to the screw hole 5b, and the screw hole 5b and the counter bore 4a are internally provided with first screws 17 so as to connect the fixed support 5 and the support arm 4. The first positioning surface 4a may be provided on the support arm 4 to enhance the positioning between the fixing mount 5 and the support arm 4, and positioning pins may be disposed in other embodiments. In this embodiment, the number of the screw holes 5b is four.

The lower part of the movable support 3 is provided with at least one through hole 27, and a second screw 28 is connected with the sliding block 2 after penetrating through the through hole 27. A second positioning surface 2a may be provided on the slider 2 to enhance the positioning between the cradle 3 and the slider 2, and positioning pins may be provided in other embodiments. In the present embodiment, the number of the through holes 27 is four.

As shown in fig. 6 and 7, a first abdicating gap G and a second abdicating gap H are respectively arranged between the first screw 17 and the counter bore 4a and between the second screw 28 and the through hole 27, and axial adjustment amounts of a point B and a point C are transferred to the abdicating gaps, and when the hinge structures of the point B and the point C are assembled, the movable arm 6 can rotate radially around the axis BC, so that adjustment of hinge axes of the point B and the point C is realized, and the adjustable dimensions of the pentagonal mechanism are further increased.

A first adapter support 18 is fixed on the inner side of the first mounting frame 71, a first adjusting surface 18a and a first adjusting hole 18b are arranged in the first adapter support 18, a first fixing seat 19 is matched in the first adjusting hole 18b, a third bearing 20 is arranged in the first fixing seat 19, a first adjusting screw 21 is matched in the first fixing seat 19 along the circumferential direction, and a rod body end surface 21a of the first adjusting screw 21 abuts against the first adjusting surface 18 a.

A second adapter support 22 is fixed on the inner side of the second mounting rack 72, a second adjusting surface 22a and a second adjusting hole 22b are arranged in the second adapter support 22, a second fixed seat 23 is matched in the second adjusting hole 22b, a fourth bearing 24 is arranged in the second fixed seat 23, a second adjusting screw 25 is matched with the second fixed seat 23 along the circumferential direction, and a rod body end surface 25a of the second adjusting screw 25 abuts against the second adjusting surface 22 a;

the support shaft 8 is supported by a third bearing 20 and a fourth bearing 24; a positioning step surface 8a is arranged in the middle of the supporting shaft 8; one end face of the supporting arm 4 abuts against the positioning step face 8 a; a shaft sleeve 26 is arranged between the other end surface of the support arm 4 and the inner end surface of the fourth bearing 24.

During the assembly of the viewfinder, firstly, the adjusting screws 21 and 25 are loosened, so that the gaps L1 between the fixed seats 19 and 23 and the adjusting surfaces 18a and 22a are respectively equal to 0, at the moment, the first switching support 18 and the second switching support 22 are close to the center, and the switching supports are inserted into the positioning circle I on the viewfinder base; then adjusting the adjusting screw rods 21 and 25 to center the supporting arm 4, so that the supporting arm 4 can be connected in the center by taking the screw and nut mechanism as a reference, the left and right position precision and rigidity of the mechanism are greatly improved, the movement flexibility of the mechanism is ensured, the physical stability of an optical system is effectively improved, and vertigo is avoided.

As shown in fig. 8, the above-mentioned pentagonal hinge mechanism principle, where O1, O2 are two fixed rotation centers, Z1P1 is an axis parallel to the lead screw and located by a straight line passing through a hinge point of the slider, the axis can rotate around O2, O2Z1 is a vertical distance from O2 to Z1P1, the Z1P1 rod is hinged with the O1P1 rod at P1, and the O1P1 rod can rotate around O1.

The point P1 is driven to move on the lever Z1P1 to Z1 by a distance Δ L. At this point P1 point reached P2, the Z1P1 rod rotated about O2 point to Z2P2, and Z2 was the foot of O2 to the screw shaft. The Z2P2 is extended reversely and then is crossed with Z1P1 at a point n, and the rotation angle of the axial line of the screw rod at the moment is equal to P2nP 1.

From the above conditions it follows:

Z2P2＝Z1P1-ΔL……………………………①

Z1O2＝Z2O2………………………………②

∠P2nP1＝∠Z1O2Z2…………………………③

in Δ O1O2P2, the following can be obtained according to the cosine theorem:

therefore:

∠Z1O2Z2＝∠Z1O2O1-∠Z2O2P2-∠P2O2O1……………⑧

the simultaneous equations can be found:

wherein: length of movable arm P1O1 ═ P2O1

And the equation ninthly is a relational expression of the linear motion distance delta L and the rigid body rotation angle P2nP 1.

When the mechanism is realized, the motor drives the synchronous belt to drive the screw rod to rotate, the screw rod drives the sliding block to do linear motion when rotating, and the linear motion of the sliding block drives the hinge point P1 of the sliding support to do linear motion.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (6)

1. A hinge structure includes a fixed mount (5) and a first hinge shaft (13); the method is characterized in that: a first bearing (11) and a second bearing (12) are arranged on the fixed support (5) at intervals; a first hinge shaft (13) is supported in the first bearing (11) and the second bearing (12); the first hinge shaft (13) is hinged with a movable arm (6).

2. The hinge structure as claimed in claim 1, wherein: a first bearing retainer ring (14) is arranged between the first bearing (11) and the movable arm (6); a second bearing retainer ring (15) is arranged between the second bearing (12) and the movable arm (6); a bearing limiting step (5a) is arranged on one side of the fixed support (5); the second bearing (12) abuts against the bearing limit step (5 a); a bearing end cover (16) is fixed on the other side of the fixed support (5); the inner side end face of the bearing end cover (16) abuts against the outer side end face of the first bearing (11), so that the first bearing (11), the first bearing retainer ring (14), the movable arm (6), the second bearing retainer ring (15) and the second bearing (12) are sequentially pressed.

3. The hinge structure according to claim 1 or 2, wherein: the top of the fixed support (5) is provided with at least one screw hole (5 b); the supporting arm (4) is provided with a counter bore (4a) corresponding to the screw hole (5 b); and first screws (17) are arranged in the screw holes (5b) and the counter bores (4a) so as to connect the fixed support (5) and the support arm (4).

4. A hinge structure as claimed in claim 3, wherein: a first adjusting gap (G) is arranged between the first screw (17) and the counter bore (4 a).

5. A hinge structure as claimed in claim 3, wherein: the supporting arm (4) is provided with a first positioning surface (4 b).

6. A viewfinder is characterized in that: comprising a hinge structure according to any one of claims 1 to 5.

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