JP4332171B2 - Metal detection head and metal detector - Google Patents

Description

  The present invention relates to a technique for preventing foreign matters such as dust from being mixed in an article in a metal detector for detecting metal mixed in the article.

  In a production line for foods and the like, a metal detector is used for inspecting on the line whether or not the manufactured article has metal contamination.

  The metal detector has a housing in which a hole for allowing an article to pass therethrough is formed at the center, and a metal detection head for detecting a magnetic field change caused by metal mixed in the article passing through the hole. And conveying means such as a conveyor that conveys the article to be inspected so as to pass through the hole of the metal detection head.

  Inside the casing of the metal detection head, a plurality of coils are provided for generating a magnetic field in the hole and detecting a change in the magnetic field due to the passage of the article. A conventional metal detector having such a metal detection head is disclosed in, for example, the following Patent Document 1 (particularly, FIG. 6).

Japanese Patent No. 2948733

  In the metal detector disclosed in Patent Document 1, as shown in FIG. 6, the change of the magnetic field is caused by passing an article through a hole in a rectangular frame-shaped detection bed (indicated by reference numeral 27 in the figure) by a conveyor. Is detected to determine the presence or absence of metal mixed in the article.

  However, since the shape of the casing of the detection head of the conventional metal detector including the above-described Patent Document 1 is a rectangular frame shape and its upper surface is almost horizontal and flat, dust and dust easily accumulate on this upper surface. The deposit falls on the article conveyance surface, or the fallen object from above falls on the conveyance surface and is mixed with the article, which is not preferable in terms of hygiene.

  The present invention solves this problem, prevents dust and dust from accumulating on the upper surface of the housing, and suppresses the deposit and the fallen object from falling onto the article transport surface, and a metal detection head and metal detector The purpose is to provide.

In order to achieve the above object, the metal detection head of the present invention comprises:
In a metal detection head for detecting a change in a magnetic field due to a metal mixed in an article passing through the hole having a casing (31) in which a hole (32) for allowing the article to pass is formed.
The upper surface of the housing, be inclined to become lower as toward the front end and the rear end portion of the housing in a plane perpendicular to the through direction of the hole, further, on the front side of the housing, An indicator (40) for performing the metal detection process based on the magnetic field change is formed and fixed in a box shape having the same width as the casing as a separate body from the casing, and the upper surface side of the indicator is wherein it is characterized in that inclined continuously with casing front end side inclined upper surfaces of the.

The metal detector of the present invention is
A metal detection head (30) having a casing (31) through which a hole (32) for allowing an article to pass is formed and detecting a magnetic field change due to metal mixed in the article passing through the hole. )When,
In the metal detector having transport means (45 to 47, 50, 51, 55) for transporting the object to be inspected so as to pass through the hole of the metal detection head,
The upper surface of the housing of the metal detection head, be inclined to become lower as toward the front end and the rear end portion of the housing in a plane perpendicular to the through direction of the hole, further, the housing An indicator (40) for performing the metal detection process based on the magnetic field change is formed and fixed in a box shape having the same width as the casing as a separate body from the casing , It is characterized in that the upper surface of the indicator is inclined continuously with the upper surface inclined in the front side of the housing.

Thus metal detection head of the present invention, the upper surface of the housing, be inclined to become lower as toward the front end and the rear end portion of the housing in a plane perpendicular to the through direction of the hole, further An indicator that performs a metal detection process based on a change in magnetic field is formed on the front side of the casing as a separate box from the casing and is fixed in a box shape having the same width as the casing. since the upper surface side of the vessel is inclined continuously with the front side inclined upper surface of the housing, difficult dirt and dust is deposited, the probability of foreign matter falls to the conveying surface side is reduced, preferably hygiene.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show the structure of a metal detector 20 having a metal detection head (hereinafter simply referred to as a head) to which the present invention is applied.

  At the four corners on the lower surface side of the base 21, legs 22 that can be adjusted in height and casters 23 for movement are provided.

  A head 30 is supported at the center of the upper surface side of the base 21. The casing 31 of the head 30 is formed in a substantially pentagonal frame shape having a hole 32 penetrating in a horizontally long rectangle, and a transmission coil (not shown) for generating a magnetic field in the hole 32 is provided inside the casing 31. And a receiving coil (not shown) for detecting a change in magnetic field due to an article passing through the hole 32 is wound concentrically with the hole 32.

  The housing 31 of the head 30 includes frame-shaped side plates 33 and 34 facing in parallel, an upper plate 35 covering the upper surface side between the side plates 33 and 34, a front plate 36 covering the front side between the side plates 33 and 34, The rear plate 37 that covers the back side between the side plates 33 and 34 and the bottom plate 38 that covers the lower surface side between the side plates 33 and 34 are formed, and each of these plates 33 to 38 is formed of an iron plate that shields the magnetic field. ing. Moreover, the inner peripheral wall 32a surrounding the hole 32 is formed of a synthetic resin that allows a magnetic field to pass therethrough.

  Here, the casing 31 of the head 30 is inclined so that the upper surface side thereof becomes lower toward the end of the casing 31 in a plane orthogonal to the penetration direction of the hole 32. That is, the outer shape of the side plates 33 and 34 is a horizontally long pentagonal shape, and the upper portion thereof is formed in a convex triangle shape (roof shape). The upper plate 35 covering the upper surface side of the side plates 33 and 34 is The first inclined portion 35a descends from the upper apex to the upper end of the front plate 36, and the second inclined portion 35b descends from the upper apex of the side plates 33 and 34 to the upper end of the rear plate 37.

  The front surface of the casing 31 of the head 30 is electrically connected to each coil inside the head 30 to generate a magnetic field, and to perform a detection process for foreign matter contained in the article based on the change in the magnetic field. The container 40 is fixed.

  The indicator 40 is formed in a box shape having substantially the same width as the casing 31 of the head 30, and the operation surface 40 a on the upper surface side thereof is inclined so as to be continuous with the first inclined portion 35 a of the upper plate 35 of the head 30. ing.

  On the other hand, a pair of side plates 41 and 41 facing each other in parallel is provided on one end side on the upper surface side of the base 21, and a pair of side plates 41 and 41 arranged in a straight line on the other end side and facing each other in parallel. Side plates 42 and 42 are erected.

  Both ends 45 a of the drive roller 45 are supported on the front end side of the side plates 41, 41, and a drive motor 46 is attached to the inside of one side plate 41, and a drive belt 47 is interposed between the drive roller 45 and the drive motor 46. Is over. Further, both ends 50a of the driven roller 50 are supported on the leading ends of the side plates 42, 42.

  On the upper edges of the side plates 41, 41, both ends on one end side of the belt receiver 51 made of synthetic resin are supported. The belt receiver 51 passes through a low position of the hole 32 of the head 30, and both edges on the other end side are supported by the upper edges of the side plates 42 and 42.

  An endless conveying belt 55 is stretched between the driving roller 45 and the driven roller 50, and circulates under the rotational force of the driving roller 45. The belt receiver 51 supports a conveyor belt 55 passing above from below, and stably conveys articles.

  Note that guide rollers 57 and 57 for conveying the conveying belt 55 in a state of being close to the lower surface of the belt receiver 51 are supported on the lower surfaces of both ends of the belt receiver 51. Reference numeral 58 in the figure denotes a synthetic resin support plate that supports the belt receiver 51 in the vicinity of the head 30, and reference numeral 59 denotes a connecting member for connecting the side plates.

  The driving roller 45, the driving motor 46, the driving belt 47, the driven roller 50, the belt receiver 51, the conveying belt 55, the guide roller 57, and members for supporting them on the base 21 are used to load articles in the holes 32 of the head 30. It forms a conveying means (conveyor) for passing through, but is not limited to a conveyor type in which a belt is driven by such a motor as a metal detector, for example, by sliding an article by its own weight, 32 may be used.

  In the metal detector 20 configured as described above, an article carried from a front conveyor (not shown) is received at one end of the conveyor belt 55 and passed through the hole 32 of the head 30.

  A predetermined magnetic field is generated in the hole 32 of the head 30 by the drive signal of the indicator 40, and a change in the magnetic field due to the passage of the article is detected by the indicator 40, and metal is mixed in the article from the detection signal. It is determined whether or not, and the determination result is displayed on the operation surface and is sent to a subsequent selection line (not shown) or the like, and a selection process according to the determination result is performed.

  Here, since the first inclined portion 35a and the second inclined portion 35b on the upper surface side of the casing 31 of the head 30 are inclined from the top toward the front plate 36 and the rear plate 37, the dust as shown in FIG. The foreign matter D such as dust or dust moves along the inclination and falls to the side of the conveyor belt 55.

  Therefore, these foreign matters D are not easily deposited and are not easily dropped on the conveyance surface, and the problem of hygiene, which is mixed with articles moving on the conveyance surface, is greatly improved.

  Moreover, since the upper surface side (operation surface 40a) of the indicator 40 fixed to the front surface of the head 30 is also inclined so as to be continuous with the first inclined portion 35a of the head 30, dust falls to a position farther from the conveying surface. It can be made more hygienic and safe.

The head 30 of the above embodiment has a shape in which the top portion on the upper surface side is close to the front plate 56, but is formed so as to be inclined toward the end portion in a plane orthogonal to the penetration direction of the hole 32. sufficient if may be shaped with the apex in the central portion as in example head 30 'of FIG. 7.

The inclination of the upper surface of the housing 31 is not only linear, as described above, for example, as shown in FIG. 8, but it may also be inclined in an arc shape.

  In addition, the head of the above embodiment is inclined so as to descend toward the front end or the rear end, and has a flat structure not inclined with respect to the side (conveying surface side) so that the cleaning operation can be easily performed. However, when giving priority to the fall of foreign matter on the conveying surface side, a groove along the front-rear direction, that is, perpendicular to the penetrating direction of the hole 32 is provided on the upper surface of the housing, or the upper edges of the side plates 33 and 34 are provided. For example, the height may be higher than that of the upper plate 35 so that foreign matter cannot move sideways (conveying surface side) from between the groove and the upper edge of the side plate.

The perspective view of the embodiment of the present invention. Plan view of the embodiment Left side view of the embodiment Right side view of the embodiment Front view of the embodiment Bottom view of the embodiment The figure which shows the modification of the principal part of embodiment. The figure which shows the modification of the principal part of embodiment.

Explanation of symbols

  20 ... Metal detector, 21 ... Base, 22 ... Leg, 30 ... Metal detection head, 31 ... Housing, 32 ... Hole, 33, 34 ... Side plate, 35 ... Top plate, 35a ... First inclined portion, 35 b... Second inclined portion, 36... Front plate, 37 .. Rear plate, 38 .. Bottom plate, 40 .. Indicator, 40 a .. Operation surface, 41, 42. , 45... Driving roller, 46... Driving motor, 47... Driving belt, 50 .. driven roller, 51.

Claims (2)

In a metal detection head for detecting a change in a magnetic field due to a metal mixed in an article passing through the hole having a casing (31) in which a hole (32) for allowing the article to pass is formed.
The upper surface of the housing, be inclined to become lower as toward the front end and the rear end portion of the housing in a plane perpendicular to the through direction of the hole, further, on the front side of the housing, An indicator (40) for performing the metal detection process based on the magnetic field change is formed and fixed in a box shape having the same width as the casing as a separate body from the casing, and the upper surface side of the indicator is the metal detection head, characterized in that inclined upper surface of the front end of the housing and are inclined continuously. A metal detection head (30) having a casing (31) through which a hole (32) for allowing an article to pass is formed and detecting a magnetic field change due to metal mixed in the article passing through the hole. )When,
In the metal detector having transport means (45 to 47, 50, 51, 55) for transporting the object to be inspected so as to pass through the hole of the metal detection head,
The upper surface of the housing of the metal detection head, be inclined to become lower as toward the front end and the rear end portion of the housing in a plane perpendicular to the through direction of the hole, further, the housing An indicator (40) for performing the metal detection process based on the magnetic field change is formed and fixed in a box shape having the same width as the casing as a separate body from the casing , metal detector, characterized in that the upper surface of the indicator is inclined continuously with the upper surface inclined in the front side of the housing.

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