JPS63199903A - Operating device for electrically controllable hydraulic proportional valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a proportional electromagnet and a displacement detector that is disposed coaxially with the electromagnet and operates inductively in a case made of a magnetic material. , connected to a common electronic device, the proportional electromagnet and the displacement detector have a common pressure tube, of which at least one vertical section of the larger diameter accommodates an armature and the longitudinal section of the smaller diameter At least one longitudinal section accommodates the detector core, both longitudinal sections are mechanically connected to each other, and the pressure tube passes through a hole in the case with sections of different diameters, and the reciprocating space of the pressure tube is The present invention relates to an electrically controllable operating device for a hydraulic proportional valve, which is hydraulically connected to the hydraulic space of the proportional valve.

[Conventional technology]

Such an operating device with a common case for a proportional electromagnet and a displacement detector is disclosed in German Patent Application No. 292
It is known from specification 0670.

The case is provided with a continuous hole from one end face to the other end face, and this hole is stepped several times so that the larger part of its diameter is located on the valve extension end face. This operating device has the disadvantage that the entire component of the proportional 8 m stone, here constructed in so-called wet construction, must be inserted into the housing from the valve end. The pressure tube provided in the bore is constructed in one piece, and the individual mating components of the pressure tube are sealed by O-rings. This results in expensive fabrication, is relatively difficult to assemble, and also results in scratches during sealing and off-centering. A further disadvantage is that in this case the electronic device provided for the actuating device is mounted longitudinally on the end face of the housing remote from the valve.

Not only does this result in a relatively large overall axial length, but the relatively small end face leaves less space for electronic equipment and also results in relatively long cable connections.

Furthermore, with this operating device there are also no means for adjusting the displacement detector.

[The problem that the invention attempts to solve]

The aim of the invention is to provide an easy to assemble proportional valve operating device that does not have the drawbacks mentioned above.

[Means to solve the spy chief]

In order to solve this problem, according to the present invention, the part of the hole with the smaller diameter in the case separates the two parts with the larger diameter from each other, and these two hole parts are connected to the ends of the case on opposite sides. The pressure tube is integrally constructed, the larger diameter vertical part of which is guided into the smaller diameter part of the hole, and the proportional sWt stone and the coil for the displacement detector are inserted into the hole from opposite end faces. is inserted into the larger diameter part of the

〔Effect of the invention〕

The operating device according to the invention has the advantage of producing a compact and easily manufacturable construction unit. Furthermore, since the individual structural elements of the proportional electromagnet and the displacement detector are inserted into the housing from mutually opposite end faces, the operating device can be easily assembled. Since the pressure tube is integrated, even if there is a center misalignment between the proportional electromagnet and the detector magnetic core of the displacement detector in a wet structure, it is possible to easily deal with the problem of sealing. Furthermore, the operating device allows a short axial length,
It also allows short cable connections to attached electronic devices.

Advantageous developments and improvements of the operating device according to claim 1 are possible with the measures listed in claims 2 to 11. The embodiment according to claim 2 is particularly advantageous since the operating device allows a large flat mounting surface for the electronic device and a large space is available for axial mounting. Other useful configurations may be found in the other claims, especially those that save space and facilitate inexpensive construction and easy handling and assembly.

〔Example〕

An embodiment of the invention is shown in the drawing and will be described below.

The operating device 10 essentially consists of a proportional electromagnet 11 , a displacement detector 12 and an associated electronic device 13 . The proportional electromagnet 11 and the displacement detector 12 are provided in a common case 14 made of magnetic material, and a proportional valve 16 (not shown) is mounted on a valve copper end face 15 of this case in a known manner.

A continuous bore 17 extends longitudinally into the case 14 from the valve copper end face 15 to an opposite second end face 18 remote from the valve. This hole 15 is stepped several times and opens towards the valve copper end face 15 to form a first part 19 of larger diameter, in which the electromagnetic coil 21 of the proportional electromagnet 11 is generally accommodated. has been done. The first part 19 is followed by a second part 22 of smaller diameter, in which the pressure tube 23 of the operating device 10 is guided and supported. The second part 22 of the hole 17 transitions into a third part 24 of larger diameter which opens towards the second end face 18 .

The pressure tube 23 introduced into the stepped bore 17 consists of several individual parts that are fitted and soldered together and subsequently machined, so that the pressure tube 23 becomes one piece after its machining. This one-piece pressure tube 23 essentially comprises a first armature tube 25 forming a longitudinal section of larger diameter and a second armature tube 25 of smaller diameter which is fixedly connected to this armature tube 25 and follows it. a detector tube 26 forming the longitudinal section of the detector tube 26;

An annular flange 27 is attached to the open end of the armature tube 25 to connect the pressure tube 23 to the first part 1 of the hole in the case 14.
We will guide you within 9. The other end of the armature tube 25 transitions into a thick inwardly directed flange 281 into which the open end of the detector tube 26 is hard-soldered. Pressure pipe 23
The first longitudinal portion 25 of the hole 17 is supported within the second, smaller diameter portion 22 of the hole and extends slightly into the third portion 24 of the hole, so that the inwardly directed flange 28 It is remote from the second portion 22. Therefore pressure pipe 2
The third detector tube 26 extends freely into the third section 24.

An armature 31 of the proportional electromagnet 11 is guided for longitudinal movement in a reciprocating space 29 located therein in the area of the armature tube 25. Via a mechanical connection 32, the armature 31 is It is fixedly connected to a detector core 33 guided in the detector tube 26.

The movement of the armature 31 is transmitted to the outside or to the proportional valve 16 via a reciprocating rod 34 passing through the magnetic core 35 .

A coil spring 36 supported on the inwardly directed flange 28 pushes the armature 31 towards the cooperating end face 15 with a small force.

On the outer periphery of the detector tube 26, a measuring coil 37 of the displacement detector 12 is guided by a plastic coil carrier 38 so that it can be moved in the longitudinal direction. Ordinary ton-slit connection 39
This prevents the coil carrier 38 from rotating within the case 14.

The coil carrier 38 is supported via a spring 41 on the thick inward flange 28 of the pressure tube 23 so that the measuring coil 3
An air gap 42 is created between 7 and the inwardly directed flange 28 in order to screen out harmful magnetic fields.

The armature tube 25 has a thread 43 at its closed end, on which a nut 44 is seated, so that an adjustment means for the longitudinal adjustment of the measuring coil 37 is provided. The third portion 24 of the hole 17 that opens toward the second end surface 18 is connected to the protective lid 4.
5, it is closed to the outside. The nut 44 is further provided with a protective plate 46 for preventing the influence of magnetic fields.

The case 14 of the operating device 10 has a substantially rectangular cross section;
On the upper longitudinal side, a flat attachment extending between the end faces 15 and 18 forms a surface 47. This attachment has two cutouts 48, 49 from the first part 19 of the hole 17 leading to the face 47;
The connecting cable of the electromagnetic coil 21 is passed through these notches.

Furthermore, from the third part 24 of the hole 17 a cutout 51 leads to the mounting surface 47, through which an electrical connection cable is led from the displacement detector 12.

For installation, all the notches 48, 49, 51 on the surface 47 are covered by a cap-shaped case lid 52, and all the electronic devices a13 are installed inside this case lid. llFm stone 11 and displacement detector 12
Only the plug-in connection pieces 53 and 54 are exposed. A large area is therefore provided in the case lid 52 for the installation of the electronic device 13, which, in addition, can be easily sealed and protected from the outside by means of the flat mounting surface 47; in addition, in this case between electrical components Although the connection cable is shorter,
This is necessary for inexpensive construction and accurate operation.

The assembly of the operating device 10 is particularly simple and takes less time. For example, the pressure tube 23 and the magnet coil 21 are inserted from the cooperating end face 15, followed by the measuring coil 37 and the detent 39 from the other end face 18. It is possible. This makes assembly easier and more transparent. The integral pressure tube 23 is easily sealed against the proportional valve 16 and its sexual space 29 is hydraulically connected to the pressure medium filled space of the proportional valve 16. The joint machining of the armature tube 25 and the detector tube 26 fixedly connected thereto eliminates any misalignment, so that the holes guiding the armature 31 and the detector core 33 are exactly coaxial with each other. be. The measuring coil 37 can be adjusted simply and easily with respect to the detector core 33 by means of the adjusting means 43,44. With an inwardly directed flange 28 and an additional air gap 42 extending from the second portion 22 of the hole,
The magnetic field of the proportional electromagnet 11 is prevented from adversely affecting the inductively operated displacement detector 12. The large mounting, which extends over the entire length of the case 14 and thus over the proportional electromagnet 11 and the displacement detector 12, allows the case lid 52 to be configured relatively flat due to the surface 47 and to accommodate the entire electronic device 13 in an easily accessible manner. . The operating bag wl10 as a whole therefore allows for a compact and short construction, especially viewed in the longitudinal direction.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of the operating device to which the electronic device is attached. 10... Operating device, 11... Proportional electromagnet, 12...
・Displacement detector, 13...electronic device, 1.4...case
15.18... End face, 16... Proportional valve, 17.
... hole, 19.24 ... the larger diameter part of the hole,
21.37...Coil, 22...Portion with smaller diameter of hole, 23...Pressure pipe, 25...Vertical portion with larger diameter, 26...Vertical portion with smaller diameter. Kutel Haftsung

Claims (1)

[Claims] 1. A proportional electromagnet and a displacement detector that is provided coaxially therewith and operates inductively are provided in a case made of a magnetic material, and are connected to a common electronic device. and the displacement detectors have a common pressure tube, of which at least one vertical section of larger diameter accommodates the armature and at least one longitudinal section of smaller diameter accommodates the detector core. The two longitudinal parts are mechanically connected to each other, the pressure pipe passes through a hole in the case with parts having different diameters, and the reciprocating space of the pressure pipe is hydraulically connected to the hydraulic space of the proportional valve. in which the portion (22) of the smaller diameter hole (17) in the case (14) separates the two larger diameter portions (19, 24) from each other, and these two hole portions are connected to the case (14). 14), which are open toward mutually opposite end faces (15, 18), of which the pressure pipe (23) is integrally constructed, and whose longitudinal part (25) has a larger diameter;
is guided into the small diameter part (22) of the hole (17),
Coils (21, 3) for the proportional electromagnet (11) and displacement detector (12)
7) from the opposite end faces (15, 18) to the hole (17).
) is inserted into the larger diameter part (19, 24) of the electrically controllable hydraulic proportional valve. 2. The case (14) has a mounting surface (47) that extends over the proportional electromagnet (11) and the displacement detector (12) and forms a vertical side of the case, and the electronic device (13) is mounted on this mounting surface. The operating device according to claim 1, characterized in that: 3 The mounting surface (47) is formed flat, especially both end surfaces (
3. The operating device according to claim 2, wherein the operating device extends between 15 and 18). 4 Both parts (19, 24) of the larger diameter of the hole (17)
4. Actuating device according to claim 2 or 3, characterized in that at least one cutout (49, 51) from ) leads to the mounting surface (47). 5 Place the almost hat-shaped case lid (52) on the mounting surface (47).
) is attached, and an electronic device (13
) is mounted, on the outside thereof there are plug-in connections (53, 54) for the proportional electromagnet (11) and the displacement detector (12). Operating device as described. 6 The coil (37) of the displacement detector (12) is connected to the case (1
4), and the pressure pipe (23
) is longitudinally displaceably guided and adjustable via adjustment means (43, 44) accessible from the end face (18) remote from the valve. The operating device according to one or more of the above. 7. Operating device according to one or more of claims 1 to 6, characterized in that the smaller diameter part (22) of the hole (17) is provided approximately in the center of the case (14). . 8 The pressure tube (23) has an annular flange (23) at its open end.
7), and this annular flange allows the pressure pipe to pass through the larger diameter part (17) of the hole (17) near the valve end face (15).
8. Operating device according to one or more of claims 1 to 7, characterized in that it is guided by 19). 9 The larger diameter vertical portion of the pressure tube (23) forms the armature tube (25), and the detector tube (26) forming the smaller diameter vertical portion is fixedly coupled to the armature tube. and the armature tube (25) has a thick inward flange (28) for mounting the detector tube (26), which inward flange is spaced from the small diameter portion (22) of the hole (17). , into the larger diameter part (24) remote from the valve. 10 Inward flange (28) and displacement detector coil (
There is a gap (42) between the adjusting means (43,
10. Actuating device according to claim 9, characterized in that a spring (41) associated with the coil carrier (44) and applying a load to the coil carrier (38) is provided in this gap. 11 The coil (37) of the displacement detector (12) is connected to the hole (1
7) is shielded against the influence of harmful magnetic fields by a protective plate (46). Operating device as described.