CN201884371U

CN201884371U - External zero adjustment structure

Info

Publication number: CN201884371U
Application number: CN 201020647311
Authority: CN
Inventors: 渠立鹏; 云霞; 王思民; 俞帅; 李博
Original assignee: 704th Research Institute of CSIC
Current assignee: Shanghai Hengtuo Hydraulic Control Technology Co., Ltd.
Priority date: 2010-12-08
Filing date: 2010-12-08
Publication date: 2011-06-29
Anticipated expiration: 2020-12-08

Abstract

The utility model relates to an external zero adjustment structure, mainly solves the technical problem of simplifying an operating procedure of the zero adjustment for an electro-hydraulic servo valve, and adopts the technical scheme that a through zero adjusting screw hole is formed on one side wall of an upper cover in a position adjacent to the bottom part thereof, a zero adjusting screw is screwed in the zero adjusting screw hole, a groove is dug at one end of the zero adjusting screw, and a zero adjusting block provided with a zero adjusting mechanism is embedded in the groove and in clearance fit with the groove; and the zero adjusting screw is rotated so as to enable the groove of the zero adjusting screw to drive the zero adjusting block to adjust the zero position of a torque motor, therefore, the external zero adjustment structure is applicable to all sorts of torque motor type electro-hydraulic servo valves.

Description

The outside zero inclined to one side structure of adjusting

Technical field:

The utility model relates to the assembly of a kind of electrohydraulic control, particularly a kind of electrohydraulic control.

Background technique:

Electrohydraulic control is the key element in the electrohydraulic servo-controlling system, torque motor formula electrohydraulic control commonly used is with moment motor driven guide jet action valve, be applicable to the highi degree of accuracy electrohydraulic servo-controlling system, when the electrohydraulic control zero-bit changes (skew), normally adjust by the zeroing piece of torque motor, the torque motor that existing electrohydraulic control structural feature is mounted on the valve body is sealed in the valve body by a loam cake, and after installation, add aluminium envelope to guarantee that valve normally moves, the adjustment operation of therefore above-mentioned torque motor zeroing must be finished follow procedure: removal aluminium envelope, dismounting is loam cake down, adjust the zeroing part, loam cake is installed, add the aluminium envelope, though existing structure simple structure, fabrication and processing is convenient, but has following point:

Be subjected to the electrohydraulic control structural limitations, programmed sequence of operations is loaded down with trivial details, and maintenance is inconvenient partially to carry out zero;

Using the scene; when electrohydraulic control zero-bit in running is offset; the on-the-spot adjustment because how inconvenient program is; influence the workmanship of control system; and increase the maintenance service cost thus; increase maintenance difficulty, and may bring unfavorable factors such as needing shutdown maintenance because servovalve zero changes partially to system.

The model utility content:

Technical problem to be solved in the utility model provides a kind of outside zero inclined to one side structure of adjusting, and it can simplify electrohydraulic control adjustment zero inclined to one side programmed sequence of operations, reduces significantly and adjusts zero inclined to one side user cost, and can adjust zero assurance system partially in good time and normally move.

The technical scheme in the invention for solving the above technical problem is:

The outside zero inclined to one side structure of adjusting comprises loam cake, zero setting mechanism and torque motor, cover encloses covers zero setting mechanism and torque motor, zero setting mechanism is connected with torque motor, be characterized in: the place, the nearly bottom of a sidewall of thickening at loam cake offers a zeroing screw that runs through, be installed with a zeroing screw in this zeroing screw, this zeroing screw one end digs and is provided with groove, be embedded with the zeroing piece of zero setting mechanism in this groove and be Spielpassung, rotation zeroing screw, the groove of this zeroing screw drives the zero-bit that the zeroing piece is adjusted torque motor.

The utility model adopts the loam cake sidewall to revolve the structure of establishing the zeroing screw; carry out zero offset when whole; can directly carry out zero maintenance partially at loam cake outside turn zeroing screw; exempt the troublesome operation program of the whole maintenance of existing zero offset; reduce the maintenance service cost; reduce maintenance difficulty; and can eliminate because servovalve zero changes partially to system and bring the unfavorable factor that needs shutdown maintenance; and the utility model is simple in structure; can not increase the equipment making cost; favourablely on similar electrohydraulic control, apply, have good economic benefit.

Description of drawings:

Fig. 1 is that the outside adjustment zero inclined to one side structure master of the utility model looks schematic representation.

Fig. 2 is Fig. 1 schematic top plan view.

Fig. 3 is that zeroing screw master looks schematic representation among Fig. 1.

Fig. 4 be among Fig. 3 C to view.

Embodiment:

With reference to Fig. 1,2, the outside zero inclined to one side structure of adjusting includes loam cake 1, zero setting mechanism 2, torque motor 3 and zeroing screw 4.

Loam cake 1, its basic structure is similar with known technology, after loam cake 1 and valve body installation, form the lid inner chamber of a sealing, this inner chamber is in order to ccontaining zero setting mechanism 2 and torque motor 3, for guaranteeing that electrohydraulic control normally moves, usually loam cake 1 is fixed on all to add behind the valve body and puts the aluminium envelope, loam cake 1 structural feature of the present utility model is: at the corresponding zero setting mechanism 2 one side loam cakes 1 one-body molded sidewall 12 that a thickening is arranged, the thickness of this sidewall 12 should be selected to adapt to and revolve the zeroing screw 11 of establishing zeroing screw 4, also optional being used in forms a boss on the thin sidewall 12, on boss, offer zeroing screw 11 again, the position of above-mentioned zeroing screw 11 is at the place, nearly bottom of sidewall 12, zeroing screw 11 is penetration state, and the center line of zeroing screw 11 is vertical with the bottom surface of zero setting mechanism 2 zeroing pieces 21.

Zero setting mechanism 2, its structure is similar with known technology or identical, and this mechanism includes zeroing piece 21 and zeroing silk 22, and these zeroing silk 22 1 ends are connected in torque motor, and its other end is connected with zeroing piece 21.

Zeroing screw 4 includes body 41, zeroing groove 42, outside thread 43, goes up projection 44 and following projection 45, wherein:

Zeroing groove 42 is positioned at an end of body 41, during the zeroing operation, screw-driver can be inserted zeroing groove 42 and realize the zeroing action;

The zeroing screw correspondence of outside thread 43 and loam cake 1 screws;

Upper and

lower projection

44,45, the other end and the body 41 that are positioned at body 41 corresponding zeroing grooves 42 are one-body molded, the length of zeroing screw 4 be able to make it screw in the zeroing screw 11 back upper and

lower projections

44,45 of maintenance can stretch into loam cake 1 inner chamber, and the zeroing piece 21 that can make zero setting mechanism 2 is entrenched in the upper and

lower projection

44,45, and the upper and lower side 440,450 of promptly upper and

lower projection

44,45 constitutes zeroing screws 4 one ends and digs the groove of establishing (as Fig. 3,4); The structure of this groove, also can adopt similar other scheme, as end projection one cylinder at zeroing screw 4, this cylinder external diameter is less than the core diameter of thread of outside thread 43, dig at this cylindrical section and to establish a groove, the function of this groove is identical with the function of above-mentioned upper and

lower projection

44,45, and the height of upper and

lower projection

44,45 should be slightly larger than the height of zeroing piece 21; The upper and lower side 440,450 (shown in Fig. 3,4) of upper and

lower projection

44,45 forms the width of groove, i.e. groove width size A as shown in Figure 4; The mated condition of upper and

lower projection

44,45 formation grooves and zeroing piece 21 as shown in Figure 4, the upper and lower side 210,210 ' of zeroing piece 21 forms its thickness B (as Fig. 4), groove width A and thickness B are Spielpassung, and the groove width that the upper and lower side 440,450 of promptly described zeroing screw 4 upper and

lower projections

44,45 forms and the upper and lower side 210 of the zero setting mechanism that is embedded 2 zeroing pieces 21 correspondences, the matching gap between 210 ' zeroing piece 21 thickness that form are not more than 0.2 millimeter.

When zeroing was operated, the operator was as long as with screw-driver turn zeroing screw 4, can finish the zeroing of torque motor 3, no matter at the workshop of maintenance or in the place of electrohydraulic control use, the zeroing operation all can be finished by the utmost point easily.

Claims

1. zero inclined to one side structure is adjusted in an outside, comprise loam cake, zero setting mechanism and torque motor, cover encloses covers zero setting mechanism and torque motor, zero setting mechanism is connected with torque motor, it is characterized in that: the place, the nearly bottom of a sidewall (12) of thickening at loam cake (1) offers a zeroing screw (11) that runs through, be installed with a zeroing screw (4) in this zeroing screw (11), these zeroing screw (4) one ends dig and are provided with groove, be embedded with the adjustment piece (21) of zero setting mechanism (2) in this groove and be Spielpassung, rotation zeroing screw (4), the groove of this zeroing screw (4) drives the zero-bit that zeroing piece (21) is adjusted torque motor (3).

2. the outside zero inclined to one side structure of adjusting according to claim 1, the upper and lower sidewall (440,450) that it is characterized in that being positioned at the upper and lower projection (44,45) of screw (4) one ends constitutes zeroing screw (4) one ends and digs the groove of establishing.

3. outside zero structure partially of adjusting according to claim 1 and 2 is characterized in that the matching gap between zeroing piece (21) thickness of upper and lower side (210, the 210 ') formation that groove width that the upper and lower side (440,450) of the upper and lower projection of described zeroing screw (4) (44,45) forms and zero setting mechanism (2) the zeroing piece (21) that is embedded are corresponding is not more than 0.2 millimeter.