Device for the detection of ferromagnetic foreign bodies, in particular to protect the working bodies of the harvesting machines (options)

 

The invention relates to a device for the detection of ferromagnetic foreign bodies, in particular for the protection of the working bodies of harvesting machines, such as harvesters, field choppers, etc. the Device contains a system of permanent magnets constant polarity across the entire width of the stream of technological product, magnetized at an angle 45 to 90° to the plane of symmetry of the magnetic system. The measuring coil cover pole magnets and is connected to the electronic evaluation unit. Symmetric part of the magnetic system are facing each other the same poles. The measuring coil is placed on the outer surface of the permanent magnets facing the space motion of a technological product, covering one common pole for all magnets. Magnets can be made in the form of rectangular rods, the geometrical axis of which coincides with the axis of their magnetization. The technical result - increased robustness and sensitivity of the device. 2 S. and 4 C.p. f-crystals. 5 Il.

The invention relates to a device for the detection of ferromagnetic foreign bodies, in particular to protect workers about the creation [1] for detection of ferromagnetic foreign bodies, in particular for the protection of the working bodies of cleaning machines, selected as a prototype, which contains the system by creating a magnetic field with constant polarity across the entire width of the stream of technological product, consisting of permanent magnets, the magnetization vector which is directed under an angle of 45-90 to the plane of symmetry of the magnetic system. Permanent magnets covered by the measuring coils, which are connected to the electronic evaluation unit. Magnets mounted on a non-magnetic frame and can magnetically shielded ferromagnetic plate shield on the side opposite to the space motion of a technological product.

The principle of operation of this device is based on the appearance of the pulse emf. in the measuring coils due to the change of flux linkage magnetic field coils when the movement of the ferromagnetic bodies in space of the magnetic field of permanent magnets. Induced in the measuring coils pulse emf. perceives an electronic evaluation unit, which identifies this momentum as a useful signal or noise and issues the appropriate command to the control system of the harvesting machine. In the magnetic system of the device, the magnets included between the FDS is Otok, common to both parts of the magnetic system. Accepted agree to the inclusion of magnets allows you to get under specified and limited size of the magnetic system and the measuring coils maximum value of magnetic induction in the most distant from the magnetic system regions of space.

This "stand-off" of the magnetic system of the device [1] is very effective for detection of a moving ferromagnetic objects in the absence of those same distances ferromagnetic bodies, which is also moving, but not to be detected, for example, the ferromagnetic parts of the harvesting machine. Such ferromagnetic body even at large distances, it interferes with the operation of the device, because they can cause false triggering, which is the disadvantage of the prototype.

The basis of the invention is the task in the device for the detection of ferromagnetic foreign bodies, in particular to protect the working bodies of the harvesting machines to improve the noise immunity of the device to the influence on his work is not subject to detection of a moving ferromagnetic objects.

The task is implemented in the device for the detection of ferromagnetic foreign bodies, in particular to protect rabotata technological product, consisting of permanent magnets magnetized at a 45-90 to the plane of symmetry of the magnetic system, and the measuring coils, covering the pole magnets and is connected to the electronic evaluation unit, in which the symmetric part of the magnetic system are facing each other the same poles, and the measuring coil is placed on the outer surface of the permanent magnets facing the space motion of a technological product, and cover one common pole for all magnets.

The task is implemented in the device in which the system of permanent magnets placed inside the ferromagnetic body so that the body itself is a magnetic circuit for the magnetic flux of permanent magnets on the side opposite to the space in which it moves technological product.

The task is implemented in the device in which the measuring coils are designed partitioned so that each section covers a different width of the magnetic poles of the permanent magnets and can be connected to the electronic evaluation unit individually or together with other sections.

The task is implemented in the device for detecting foreign ferro is in constant polarity across the entire width of the stream of technological product, consisting of permanent magnets magnetized at an angle 45 to 90° to the plane of symmetry of the magnetic system, and the measuring coils attached to the electronic evaluation unit in which magnets are made in the form of rectangular bars, the geometrical axis of which coincides with the axis of their magnetization, and is installed in series on the inner opposite surfaces of the ferromagnetic body so that these rows of magnets interact with similar poles, while the measuring coil cover pole of each row of magnets or one common pole for all magnets.

The task is implemented in the device, in which the ferromagnetic body is made V-shaped, the opposite face of which is aligned at an angle close to 90° .

The task is implemented in the device, supplemented ferromagnetic hub prismatic shape, located between the same poles symmetrically placed rows of magnets, with the measuring coil is installed on the surface of the hub and covers one common pole for all magnets.

Counter enable symmetric parts of the magnetic system according to the scheme S1-N1-N2- what about the product one common to the whole magnetic system magnetic poles N1-N2the concentration of the magnetic field near the plane of symmetry that divides the magnetic system and, conversely, reducing the concentration of the magnetic field in the side, relative to the magnets, regions of space where it is most likely to move the ferromagnetic body, not subject to identification.

The concentration of the magnetic flux mainly in the region of the plane of symmetry of the magnetic system causes a more rapid change of magnetic flux linked with the measuring coils, caused by the movement of the ferromagnetic phone as the pulse induced in the measuring coils emf. (eto) depends not only on the magnitude of change of magnetic fluxF, but also on the speed of its change over timet (t - time you move the ferromagnetic body in the magnetic field), and then induced in the measuring coils emf. (eto) increases by reducing the length of timet: eto=-F/t and decreasing prodolzhitelnost timet helps to ensure a sawtoothed (short) form induced in the coils emf. (eto), which is perceived and identified by the electronic evaluation unit more clearly, and thus, simplifies the configuration of the electronic unit.

The placement of the magnetic system with the measuring coils in ferromagnetic frame, which simultaneously performs the functions of the magnetic circuit and the magnetic screen, also increases the immunity of the device, protecting the measuring coil from influence of flutti extraneous magnetic fields and electromagnetic waves.

The measurement coils partitioned with different width sections causes the interaction of any of sections with different magnetic fluxes corresponding to the width of the section. Section with a smaller width coupled with the lower magnetic flux, which is confined mainly in the area close to the plane of symmetry of the magnetic system, and therefore less subject to interference from the moving ferromagnetic objects that cannot be detected, because these bodies do not fall directly within the scope of magnetic flux linked with this section of the measuring coil. Wider sections ferromagnetic bodies, especially at large distances and in the lateral zones of the space around the magnetic system.

The combination of connection of the sections with an electronic evaluation unit and between them allows to some extent to optimize the measuring coil, which consists of the following sections, from the point of view of its sensitivity and noise immunity.

Essentially the same effect to increase noise immunity and sensitivity of the device can be achieved by performing the magnetic system of the device in the form of rods, magnetized along its geometric axis and placed in rows on opposite planes of the ferromagnetic body. The angle of the rows of magnets to the plane of symmetry of the magnetic system is chosen such that the bar magnets of opposite rows interacted with similar poles so that the angle between the magnetization vectors of opposite rows of magnets would have been approximately 90° . The use of permanent magnets in the form of rods allows the use in the manufacture of plate magnets normalized sizes. In this device, each row of magnets is covered by your measuring coil. The measuring coil of each of the right NEX is ncentratio magnetic flux in the area of the plane of symmetry of the magnetic system and a reduction of the magnetic resistance of the magnetic system between the same poles of the magnets can be installed ferromagnetic hub prismatic shape.

Installation of the permanent magnets in the form of rods on opposite sides of a V-shaped ferromagnetic body most technologically advanced in the manufacture of the hull of a steel standard area, which is an additional advantage of this option, run the device.

The invention is illustrated graphics, which depict:

In Fig.1 shows a cross section of the device for detection of ferromagnetic foreign bodies, in particular to protect the working bodies of the harvesting machines (in the future).

In Fig.2 shows a cross section of the device with a magnet system inside the ferromagnetic body.

In Fig.3 shows the section of the measuring coil of the device.

In Fig.4 shows a cross section of the device in which the magnets are placed in rows on opposite side surfaces of the ferromagnetic body and each row of magnets is covered by its coil.

In Fig.5 shows a cross section of the device in which the magnets are placed in rows on opposite side surfaces of the ferromagnetic body, complemented by a ferromagnetic hub, and the measuring coil covers one General .gif" border="0">=45-90° to the plane of symmetry of the magnetic system.

Adopted by the polarity and direction of the vector 3 of magnetization of the magnets 1 causes the interaction of magnets located on opposite sides of the plane of symmetry of the magnetic system, the magnetic poles of one polarity N1-N2that is a counter enable magnets scheme S1-N1-N2-S2.

Counter the inclusion of magnets creates a magnetic field in which magnetic flux coming out of the poles of the magnetic system in the workspace, concentrated mainly in the area of the plane of symmetry of the magnetic system. This picture of the magnetic field causes the corresponding location of the measuring coil 2, and such that the coil encompassed a total for all magnets of the same pole N (N1+N2N). Therefore, the coil 2 is located on the surface of the magnets 1, facing the space for the movement of technological product, and the plane of the winding turns of the coil 2 in the same plane as the surface of the magnets.

The device may be placed in the ferromagnetic case 4, as shown in Fig.2. The wall thickness of ferromagnet from the influence on the measuring coil 2 external magnetic fields and electromagnetic waves, and provided the General circuit of the magnetic flux across the magnetic system without a significant loss of magnetizing force of the magnets in the body of ferromagnetic casing 4 as part of the magnetic circuit. The measuring coil 2 can be made of separate sections 2A and 26 (Fig.3).

Section 2A has a large width, and section 2B has a smaller width. Accordingly adopted the width of the sections they are linked with different magnetic fluxes coming from the poles of the magnets. Thus, section 2A engages with a large magnetic flux connected through a wider space, and section 2B coupled with the lower magnetic flux, mud through less wide space. When this magnetic flux coming from the poles in the area of the plane of symmetry of the magnetic system, is common to all sections.

The choice of the width of the sections of the measuring coil can significantly alter its sensitivity to detect a moving ferromagnetic objects in different regions of space, and thus within certain limits, to increase the selectivity of the device to the perception of the useful signal and the interference signal.

Permanent magnets 1 can be performed in the form of rods and placed in a row on the inner surface of Fe is itnow system similar poles so the vectors of magnetization 3 magnets face each other at an angle of ~90° . Each bar magnet magnetized along its geometrical axis and may be made of plate magnets normalized sizes, which reduces the magnetic system. Ferromagnetic casing 4 is V-shaped from the area than improving the manufacturability of such body and decreases its value.

Each of the measuring coil 2 is placed on its number of magnets, and the coils are connected among themselves consistently, according to and are connected to the electronic evaluation unit.

For some reduction of the magnetic resistance of the magnetic system of the device and a higher concentration of the magnetic field in the zone of the plane of magnetic symmetry in the device can be made of ferromagnetic hub 5, as shown in Fig.5. In this case two measuring coils is convenient to combine into one total for the whole of the magnetic system and to place the coil 2 on the ferromagnetic hub 5.

The operating principle of the proposed device does not differ from the principle of similar devices and, in particular, from the device prototype.

Movement ferromagnetically measuring coils and guidance in this regard in the coils of the pulse emf. Impulse emf. measuring coils is fed to an electronic evaluation unit, identified this unit as a signal caused by the movement of a ferromagnetic foreign body, which is found in the process stream of the product. In this case, the electronic unit issues a command to disable (stop) the harvesting machine and thus protect the working bodies of the harvesting machine from the ingress of foreign ferromagnetic phone

Sources of information

1. Applications for the invention "Pastry for viyavlennya ferromagnetic strong til, socremo for zahistu workman government spiralina machines" No. 20010074563 (UA) from 03.07.2001, "Device for detection of ferromagnetic foreign bodies, in particular to protect the working bodies of the harvesting machines" No. 2001120755 (RU) from 25.07.2001, IPC A 01 D 75/18.

Claims

1. Device for the detection of ferromagnetic foreign bodies, in particular to protect the working bodies of cleaning machines, containing a system of permanent magnets constant polarity across the entire width of the stream of technological product, consisting of permanent magnets magnetized at an angle 45°-90° to the plane of symmetry of the magnetic system, and the measuring coils, covering polysystem facing each other with similar poles, and the measuring coil is placed on the outer surface of the permanent magnets facing the space motion of a technological product, so that cover one common pole for all magnets.

2. The device under item 1, characterized in that the system of permanent magnets placed inside the ferromagnetic body so that the body itself is a magnetic circuit for the magnetic flux of permanent magnets on the side opposite to the space in which it moves technological product.

3. The device according to PP.1 and 2, characterized in that the measuring coils are designed partitioned so that each section covers a different width of the magnetic poles of the permanent magnets and can be connected to the electronic evaluation unit individually or together with other sections.

4. Device for the detection of ferromagnetic foreign bodies, in particular to protect the working bodies of cleaning machines, containing a system of permanent magnets constant polarity across the entire width of the stream of technological product, consisting of permanent magnets magnetized at an angle 45°-90° to the plane of symmetry of the magnetic system, and the measuring coils, covering the poles of the magnets, and so is her the geometric axis of which coincides with the axis of their magnetization, and is installed in series on the inner opposite surfaces of the ferromagnetic body so that these rows of magnets interact with similar poles, while the measuring coil cover pole of each row of magnets or one common pole for all magnets.

5. The device according to p. 4, wherein the ferromagnetic body is made V-shaped, the opposite face of which is aligned at an angle close to 90°.

6. The device according to p. 4, characterized in that the device is supplemented by a ferromagnetic hub prismatic shape, located between the same poles symmetrically placed rows of magnets, with the measuring coil is installed on the surface of the hub and covers one common pole for all magnets.



 

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