CN101056396B

CN101056396B - Stabilizer for video camera monitoring

Info

Publication number: CN101056396B
Application number: CN200710067980A
Authority: CN
Inventors: 王新志; 林建仁; 王颖
Original assignee: NINGBO ZHENGDING ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: NINGBO ZHENGDING ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2007-04-12
Filing date: 2007-04-12
Publication date: 2010-05-26
Anticipated expiration: 2027-04-12
Also published as: CN101056396A

Abstract

A stabilizer for a camera monitor comprises a housing and a main shaft, characterized in that the housing is provided with a cylindrical cavity therein, a baffle is fixed on the inner wall of the cylindrical cavity, gaps are provided between axial front-rear ends of the baffle and axial front-rear ends of the cylindrical cavity, a moveable baffle is fixed on the main shaft, and a gap is provided between the radial direction of the moveable baffle and the inner wall of the cylindrical cavity, while gaps are provided between axial front-rear ends of the moveable baffle and axial front-rear ends of the cylindrical cavity, and the moveable baffle is provided with a through hole, and a left switch board and a right switch board capable of opening and closing are respectively disposed on the left side and right side of the through-hole. The advantages of the invention reside in that the moveable baffle is provided with a through-hole which makes the hydraulic oil flow fast and the damping force small, thereby the camera capable of regulating the lens position quickly; and the left and right switch boards mounted on both sides of the through-hole can close the oil passing through-hole, when the oil passing through-hole is in close state, the silicon oil can pass through a narrow free gap channel only, thereby generating a big damping force and effectively ensuring the image definition.

Description

Be used for the stabilizer on the monitoring camera-shooting

Technical field

The present invention relates to a kind ofly monitor special-purpose camera head technical field, especially refer to a kind of stabilizer that is used on the monitoring camera-shooting at gantry crane.

Background technology

Sometimes need tracing and monitoring in the monitoring camera-shooting field to mobile scene, for example, gantry crane container handling bank bridge etc., when doing industry, suspension hook is very not move on the work scene, in order to monitor that better doing the industry scene camera need be installed on the arm, because arm has bigger vibrations and mobile impulsive force, therefore common camera head is not that very fast damage is exactly that picture is very unstable, video camera when especially needing right-angle view ground otherwise the aligning ground of stopping, be not subjected to shaking of arm again and swing, in order to solve the difficult problem in this monitoring field, utilize damping principle to stablize video camera at present, have a kind of machinery inertial principle of utilizing to stablize video camera again.It in use has a lot of shortcomings existing pure damping design principle, and promptly " degree of freedom " is conflicting with " damping force ", and then damping force will descend when the degree of freedom improves, otherwise damping force has improved then degree of freedom decline; So-called " degree of freedom " just is meant the ability of video camera freedom perpendicular to ground, and in use requiring video camera is zero best perpendicular to the angle on ground, if can not perpendicular alignmnet ground, then the image frame of camera lens picked-up may deflect away from job area.And the quality of the degree of freedom depends on the size with damping force, the more little then degree of freedom of damping force is good more, but the effect of damping force is again the principal element that overcomes the video camera swing, be damping force big more to subtract the pendulum effect good more, therefore common " pure damping " auto stabilizer effect in the use is not very desirable.

Summary of the invention

Technical problem to be solved by this invention be provide at above-mentioned prior art present situation a kind of reasonable in design, can regulate video camera automatically take the photograph the face of penetrating perpendicular to ground and can solve the stabilizer on the monitoring camera-shooting of being used for of contradiction between the degree of freedom and the damping force effectively.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: this is used for the stabilizer on the monitoring camera-shooting, include housing that can be fixed on the fixed body and the main shaft that is connected with video camera, this main shaft is connected with housing rotationally, it is characterized in that being provided with cylindrical cavity in the described housing, being full of in cylindrical cavity has hydraulic oil, described main shaft is axially to be positioned at the center of cylindrical cavity, on the inwall of cylindrical cavity, have relative and between opposite position and main shaft, leave the fixed dam that meets the crack with axial restraint with main shaft, leave between the axial front and back end of this fixed dam and the axial front and back end of cylindrical cavity and meet the crack, it is arranged in described main shaft on the main shaft of cylindrical cavity and is fixed with the moving baffle plate that rotates with main shaft, and should moving baffle plate radially and leave between the inwall of cylindrical cavity and meet the crack, and moving damper shaft leaves between rear end and the axial front and back end of cylindrical cavity forward and meets the crack, and on moving baffle plate, have through hole, but on face about through hole, be respectively arranged with the left-handed opening plate and the right switchboard of opening and closing, but the left-handed opening plate of described opening and closing and the concrete structure of right switchboard are chosen as: be respectively arranged with traveller on the through hole both sides on the moving two sides, the baffle plate left and right sides, described left-handed opening plate overlaps string respectively on corresponding traveller with right switchboard, and is being equipped with the slide plate stage clip respectively between left-handed opening plate and the moving baffle plate and on each traveller between right switchboard and the moving baffle plate.

Improve, the concrete structure that described main shaft is connected with housing rotationally is preferably: main shaft is connected with housing by bearing again.

Improve again, described housing also can be provided with the draining chamber in it, is provided with slidably sliding panel in the draining chamber, and this sliding panel is divided into inside and outside two chambeies with the draining chamber, described inner chamber is annular seal space and is connected with the gap of bearing, and described exocoel communicates with external atmosphere pressure; Described draining chamber is positioned at the right of housing, and is cylindrical, and its exocoel loam cake is equipped with cover plate, and described sliding panel is for being arranged at slidingly in the draining chamber.

Improve again, can be respectively arranged with between its two ends, left and right sides of described fixed dam and the cylindrical cavity wall and can make fixed dam can be firmly fixed at tenon post in the cylindrical cavity more; But described housing decision design is cylindrical, and is fixedly formed by left cap and the mutual fit of right thimble, and described left cap fixes by screw and fixed body; And described traveller may be selected to be integral stem, two ends, the left and right sides nut that can be threaded respectively.

Compared with prior art, the invention has the advantages that to adopt and have a bigger oil hole excessively on the moving baffle plate, its effect is the asphalt channel between two chambers about increase, hydraulic oil (employing silicone oil) flows very fast like this, damping force is just very little, and this moment, the degree of freedom was very high, when video camera moves with arm, can promptly regulate camera lens perpendicular alignmnet ground, but the image frame of camera lens picked-up is guaranteed in job area; And on the oil hole both sides corresponding left and right switch is being installed excessively, its effect is to close oil hole, very little because of free slit passage again, when crossing oil hole and being in closed condition, silicone oil can only pass through from very little free slit passage, thereby producing very big damping force, this damping force forces video camera to stop swinging rapidly by free main shaft, thereby has guaranteed the definition of image effectively.

Description of drawings

Fig. 1 is the cutaway view of the embodiment of the invention;

Fig. 2 is the cutaway view of Fig. 1 along the A-A line;

Fig. 3 is the structure chart between switchboard and the moving baffle plate among Fig. 1;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is the enlarged drawing of I portion among Fig. 1;

Fig. 6 is the enlarged drawing of II portion among Fig. 1.

Embodiment

Embodiment is described in detail the present invention below in conjunction with accompanying drawing.

As Fig. 1 to shown in Figure 6, present embodiment be used for stabilizer on the monitoring camera-shooting, include housing 3 that can be fixed on the fixed body 2 and the main shaft 11 that is connected with video camera 1, this main shaft 11 is connected with housing 3 rotationally by bearing 12.Be provided with cylindrical cavity 7 in housing 3, see shown in Figure 2ly, being full of in cylindrical cavity 7 has hydraulic oil, and this reality of hydraulic oil makes example adopt silicone oil.Main shaft 11 is axially to be positioned at the center of cylindrical cavity 7, on the inwall of cylindrical cavity 7, have relative and between opposite position and main shaft 11, leave the fixed dam 6 that meets crack 73 with axial restraint with main shaft 11, leave between the axial front and back end of this fixed dam 6 and the cylindrical cavity 7 axial front and back ends and meet crack 75, see shown in Figure 6.It is arranged in the moving baffle plate 4 that is fixed with on the main shaft 11 of cylindrical cavity 7 with main shaft 11 rotations described main shaft 11, and should moving baffle plate 4 radially and leave between the inwall of cylindrical cavity 7 and meet crack 70, meet crack 74 and leave between moving baffle plate 4 axial front and back ends and the cylindrical cavity 7 axial front and back ends, see shown in Figure 5, and on moving baffle plate 4, have through hole 41, but on face about through hole 41, be respectively arranged with the left-handed opening plate 42 and the right switchboard 40 of opening and closing, on through hole 41 both sides on the moving two sides, baffle plate 4 left and right sides, be respectively arranged with traveller 8, traveller 8 is an integral stem, two ends, the left and right sides nut 80 that has been threaded respectively.Described left-handed opening plate 42 is respectively the cover string on corresponding traveller 8 with right switchboard 40, and is being equipped with slide plate stage clip 81 respectively between left-handed opening plate 42 and the moving baffle plate 4 and on each traveller 8 between right switchboard 40 and the moving baffle plate 4.Be provided with draining chamber 5 at housing 3 in it, see shown in Figure 1, in draining chamber 5, be provided with slidably sliding panel 52, this sliding panel 52 is divided into inside and outside two

chambeies

53,51 with draining chamber 5, and this inner chamber 53 is connected for annular seal space and with the gap of bearing 12, and described exocoel 51 communicates with external atmosphere pressure, draining chamber 5 is positioned at the right of housing 3, cylindrical, its exocoel 51 loam cakes are equipped with cover plate 33, and described sliding panel 52 is for being arranged at slidingly in the draining chamber 5.Between the two ends, the left and right sides of fixed dam 6 and cylindrical cavity 7 walls, be respectively arranged with tenon post 61, fixed dam 6 can be firmly fixed in the cylindrical cavity 7 more.And the housing 3 of present embodiment is cylindrical, and is fixedly formed by left cap 31 and right thimble 32 mutual fits, and left cap 31 fixes by screw 21 and fixed body 2.

So that the present invention is described in further detail;

The operation principle of the contradiction that " non-pure damping " of the present invention design principle solves is as follows:

As shown in Figure 2, on moving baffle plate, have a bigger oil hole of crossing "; its effect be increase about asphalt channel between two chambers; and for example shown in Figure 2; that left and right switch has been installed crossing the oil hole both sides again, its effect is to close oil hole, thus that the passage between two

oil pockets

73,71 becomes again about making is very little (because of free slit passage very little); the variable of asphalt channel makes damping force also become variable, the design principle that Here it is " non-pure damping ".

Principle Analysis is as follows:

At first analyze the degree of freedom state of video camera, if video camera is in freely hanging the stage perpendicular to ground gradually, because video camera and free main shaft link together, see shown in Figure 1, thereby and then rotation of drive main shaft, and free main shaft is connected with moving baffle plate, see shown in Figure 2, therefore moving baffle plate is and then rotation also, this moment moving baffle plate rotatablely move make about two

oil pockets

73,71 volumes change, see shown in Figure 2, moving baffle plate rotation direction arrow indication, left side oil pocket 73 volumes change to reducing direction, be full of the silicone oil of left oil pocket 73, be extruded and form the higher-pressure region, the volume of right oil pocket 71 is to change to big direction then to form low-pressure area, this moment is under the effect of high-low pressure, silicone oil begins from the higher-pressure region (left oil pocket) by " free slit " and cross oil hole and flow to low-pressure area (right oil pocket 71), because silicone oil can produce " resistance " when flowing in passage, and this resistance is exactly the damping force that we need just, also claims damping force, and this moment is because video camera is in the stage that freely falls, rotatablely moving of therefore moving baffle plate also is the slow stage, and this moment, left and right switch was opened.Crossing the summation that oily passage equaled oil hole and free slit, be bigger passage owing to cross oil hole, so damping force is very little, so on the position of getting back to vertical and ground that video camera can be very fast.And subtract under the pendulum state when video camera is hit, when being operated in big motion state as crane, video camera is subjected to very big impulsive force immediately this moment, this impulsive force makes video camera begin swing, because video camera and free axis connect together, free main shaft connects together with moving baffle plate again, final moving baffle plate also will begin rotation with the swing of video camera, this moment, because video camera is in the quick recovery phase after being hit, therefore, moving baffle plate also is in the fast rotational stage, atwirl moving baffle plate is left oil pocket pressure jump, oppressed the closing of switch door when compressing silicone oil flows to oil-through hole rapidly, silicone oil can only pass through very little free slit passage, thereby produces very big damping force, this damping force forces video camera to stop swinging rapidly by free main shaft, thereby has reduced the change of image frame greatly.Adjust the closing property of left and right sides switch door, the stability characteristic (quality) that can make oil pressure type auto stabilizer near with the stability characteristic (quality) of gyroscopic stabilizer.

See shown in Figure 2, left and right sides oil pocket reality can be regarded a whole grease chamber as, this grease chamber is full of silicone oil just can make the stabilizer operate as normal, because the temperature of stabilizer environment for use is constantly to change, summer high-temperature for example, winter low temperature, and the coefficient of expansion of silicone oil is bigger, for example the temperature difference reaches 60 when spending, the change in volume of silicone oil can reach about 7%, if the silicone oil volume increases grease chamber's constancy of volume, then the pressure of grease chamber increases, can cause silicone oil to leak, even destroy mainshaft cap, so the present invention also is provided with the draining case in housing, solved the infringement of expanding with heat and contract with cold and coming to grease chamber's band because of silicone oil effectively, its operation principle is as follows:

See shown in Figure 1, grease chamber's (being cylinder bore) is if when the silicone oil of lining expands, can enter the draining chamber by the slit of bearing, the volume in draining chamber can be regulated automatically, when the silicone oil that enters the draining chamber increases, the silicone oil increased pressure, promptly greater than atmospheric pressure, silicone oil promotes sliding panel and outwards moves, and sees shown in Figure 1 moving to right, till making the draining cavity volume increase to when consistent with external atmosphere pressure, when temperature reduces, the silicone oil volume-diminished in the grease chamber, and form low pressure, promptly be lower than atmospheric pressure, this moment, sliding panel was moved by external atmosphere pressure inwards.See that Fig. 1 moves to left, the draining cavity volume diminished, up to the ambient pressure balance till, the design that the draining chamber has been arranged is that oil pressure type stabilizer functional reliability is greatly improved.

As Fig. 2, Fig. 3 and shown in Figure 4, the operation principle of left and right switch and moving baffle arrangement connecting relation is, left-handed opening plate and right switchboard are fixed on the fixed dam by switchboard traveller and slide rod sleeve mother respectively, because the effect of slide plate stage clip, left and right switch is left moving baffle plate respectively, and the reservation certain clearance, make the silicone oil of left and right sides chamber to cross oil hole and circulate mutually by this gap and moving baffle plate.When height pressure reduction appears suddenly in left and right sides chamber, suppose that right oil-in chamber forms high pressure, this moment right oil-in chamber silicone oil fast left oil-in chamber flow, right switchboard is subjected to the flowing pressure of silicone oil simultaneously, it is female close to fixed dam to make it lean on cover along cunning, till blocking oil-through hole.

Claims

1. stabilizer that is used on the monitoring camera-shooting, include housing (3) that can be fixed on the fixed body (2) and the main shaft (11) that is connected with video camera (1), this main shaft (11) is connected with housing (3) rotationally, it is characterized in that being provided with in the described housing (3) cylindrical cavity (7), in cylindrical cavity (7), be full of hydraulic oil is arranged, described main shaft (11) is axially to be positioned at the center of cylindrical cavity (7), on the inwall of cylindrical cavity (7), have relative and between opposite position and main shaft (11), leave the fixed dam (6) that meets crack (73) with axial restraint with main shaft (11), axial front and back end of this fixed dam (6) and cylindrical cavity (7) axially leave between the front and back end and meet crack (75), it is arranged in the moving baffle plate (4) that is fixed with on the main shaft (11) of cylindrical cavity (7) with main shaft (11) rotation described main shaft (11), and should moving baffle plate (4) radially and leave between the inwall of cylindrical cavity (7) and meet crack (70), meet crack (74) and leave between axial front and back end of moving baffle plate (4) and the axial front and back end of cylindrical cavity (7), and on moving baffle plate (4), have a through hole (41), at through hole (41) but about be respectively arranged with the left-handed opening plate (42) and the right switchboard (40) of opening and closing on the face, but the left-handed opening plate (42) of described opening and closing and the concrete structure of right switchboard (40) are: be respectively arranged with traveller (8) on through hole (41) both sides on moving baffle plate (4) two sides, the left and right sides, described left-handed opening plate (42) overlaps string respectively on corresponding traveller (8) with right switchboard (40), and is being equipped with slide plate stage clip (81) respectively between left-handed opening plate (42) and the moving baffle plate (4) and on each traveller (8) between right switchboard (40) and the moving baffle plate (4).

2. according to the described stabilizer that is used on the monitoring camera-shooting of claim 1, it is characterized in that described main shaft (11) with the concrete structure that housing (3) is connected is rotationally: main shaft (11) is connected with housing (3) by bearing (12).

3. according to the described stabilizer that is used on the monitoring camera-shooting of claim 2, it is characterized in that described housing (3) is provided with draining chamber (5) in it, in draining chamber (5), be provided with slidably sliding panel (52), this sliding panel (52) is divided into inside and outside two chambeies (53,51) with draining chamber (5), described inner chamber (53) is connected for annular seal space and with the gap of bearing (12), and described exocoel (51) communicates with external atmosphere pressure.

4. according to the described stabilizer that is used on the monitoring camera-shooting of claim 3, it is characterized in that described draining chamber (5) is positioned at the right of housing (3), cylindrical, its exocoel (51) loam cake is equipped with cover plate (33), and described sliding panel (52) is for being arranged at slidingly in the draining chamber (5).

5. according to the described stabilizer that is used on the monitoring camera-shooting of arbitrary claim in the claim 1 to 4, it is characterized in that being respectively arranged with between its two ends, left and right sides of described fixed dam (6) and cylindrical cavity (7) wall and can make fixed dam (6) can be firmly fixed at tenon post (61) in the cylindrical cavity (7) more.

6. according to the described stabilizer that is used on the monitoring camera-shooting of arbitrary claim in the claim 1 to 4, it is characterized in that described housing (3) is cylindrical, and fixedly formed by left cap (31) and the mutual fit of right thimble (32), described left cap (31) fixes by screw (21) and fixed body (2).

7. according to the described stabilizer that is used on the monitoring camera-shooting of arbitrary claim in the claim 1 to 4, it is characterized in that described traveller (8) is an integral stem, two ends, the left and right sides nut (80) that has been threaded respectively.