JP2001212762A - Liner abrasion detecting device for centrifugal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liner abrasion detecting device capable of being used until a hole is opened in a liner without a routine inspection of the liner disposed in a housing and without a fear of fire breaking out. SOLUTION: The housing 4 of a centrifugal projector 1 is disposed in a manner that a projection opening turns sideways. Liners 6 and 7 are disposed on an inner wall of the housing 4 and a lid 3 in a predetermined interval to make a sealed space B. A projecting material 8 is disposed below and near the projection opening of the housing 4 to communicate with the sealed space B. A hole is opened in the liners 6 and 7, and projection material S coming into the sealed space B accumulates in an projection material container 9 of the projecting material indicator 8. When the projection material S increases to the predetermined amount, an alarm works.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting wear of a liner of a housing of a centrifugal projector.

[0002]

2. Description of the Related Art In general, when checking the state of wear of a liner of a housing of a centrifugal projector, it is common to periodically open a cover of a housing and visually check the liner. In this case, if the inspection is missed, the liner will pierce and damage the housing,
Projectiles scatter outside the aircraft, creating a very dangerous situation. Therefore, regular inspections must be performed frequently, which is troublesome.
In addition, the replacement of the liner is performed before the hole is opened in the liner in view of safety, which results in an increase in running cost. Recently, in order to solve such a problem, for example, a wear plate wear detecting device disclosed in Japanese Utility Model Laid-Open No. 62-95872 has been devised. This device embeds a signal line on the back of a wear plate stretched in a housing of a centrifugal projector, links it to an alarm device of a control circuit, constantly applies a signal current to the signal line, and The alarm device is activated when the signal line is disconnected due to the progress of wear of the device. However, in the above prior art, there is a danger that a spark generated at the time of cutting the signal line may ignite the abrasive powder floating in the housing of the centrifugal projector and cause a fire. .

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and it is possible to automatically detect the wear of a liner without a risk of fire. It is intended to provide a device.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has an object of automatically detecting the wear of a liner without using electric means. That is, the present invention provides a liner wear detection device, a housing, a lid for sealing a rear opening of the housing, a liner provided with a predetermined gap between the housing and the inner wall of the lid,
The housing comprises a housing, a lid, and a projection material indicator which communicates with the closed space defined by the lid and the liners 6 and 7.

[0005]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a centrifugal projector according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In FIG. 1, reference numeral 1 denotes a centrifugal projector for projecting a projectile S such as a steel grain onto an object to be polished. In the present invention, the centrifugal projector 1 is attached to a side wall of a polishing cabinet 2. The projection material is projected in a lateral direction. The centrifugal projector 1 has a housing 4 having a projection opening sideways and a rear opening closed by a lid 3, and an impeller (impeller) 5 housed in the housing 4 so as to be vertically rotatable.
And a wear-resistant liner 6 attached to the inner wall of the side plate portion on the projection surface side of the housing 4 and the lid 3, and attached to the inner wall of the opposite side plate portion other than the projection surface side of the housing 4. And a wear-resistant liner 7.

The liner 6 is formed in an arc shape along the circumference of the impeller 5, and the rear portions at both ends are in close contact with the inner wall of the housing 4, and the rear portions other than both ends are formed in the housing 4. And it is attached with a slight gap between the inner wall of the lid 3 and the inner wall. The liner 7 is also attached to the inner wall of the housing 4 with a slight gap therebetween, and a closed space B is defined by the rear portions of the liners 6 and 7 and the inner wall of the housing 4 and the lid 3. It is made as follows.

A projection material indicator 8 is provided below the housing 4 near the projection opening.
The indicator 8 comprises a blast material container 9 and a pipe 11 vertically penetrating through a ceiling portion of the container 9, and an upper end of the pipe 11 penetrates the housing 4 to seal the container. You are facing space B.

The blast material container 9 of the blast material indicator 8
Has a scale for detecting the amount of the projection material S or a projection material detection sensor (not shown), and the scale or the sensor is electrically connected to an alarm device (not shown) of the control circuit.
When the amount of the blast material S in the container 9 increases and reaches a predetermined level, an alarm device such as a buzzer or a lamp is activated.

In the centrifugal projector 1 configured as described above, the impeller 5 is driven to rotate to project the blast material S, and as the blasting operation is performed, the blast material S scattered from the impeller 5 causes the liner 6, 7 wears slowly and finally has a hole in it. Then, the projectile S passing through the perforated portion falls under its own weight in the space B and gathers at the bottom of the housing 4, and passes through the pipe 11 provided here, and the projectile indicator 8
Accumulates in the projectile container 9. And the projectile S in the container 9
When the accumulated amount of the battery reaches a predetermined level, the alarm device is activated. This indicates that holes have been made in the liners 6,7.

[0011]

As is apparent from the above description, according to the present invention, a liner is provided with a predetermined gap provided between the inner wall of the housing and the lid, and a closed space is formed by the liner, the inner wall of the housing and the lid. Since the liner is perforated to detect when the blast material enters the enclosed space, the need to periodically open the housing lid and visually inspect the liner is eliminated. Further, since a hole is formed in the liner and the liner can be detected shortly, it is not necessary to replace the liner early in view of safety, and the running cost can be reduced. Further, since the present invention does not employ an electrical detection means, there is no possibility of fire due to sparks generated when the signal line is cut.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a centrifugal projector according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centrifugal projector 2 Cleaning cabinet 3 Lid 4 Housing 5 Impeller 6, 7 Liner 8 Projection material indicator 9 Projection material container B Closed space S Projection material

Claims (2)

[Claims] 1. A housing 4, a lid 3 for sealing a rear opening of the housing 4, a liner 6, 7 provided with a predetermined gap between the housing 4 and an inner wall of the lid 3, and a housing 4. And a projecting material indicator 8 which is disposed at a position below the projection opening and communicates with the enclosed space B defined by the housing 4, the lid 3 and the liners 6, 7. Liner wear detector for projectors. 2. The blast material indicator 8 according to claim 1 is configured to activate an alarm device in accordance with an increase in the amount of blast material S passing through the perforations of the liners 6 and 7. A liner wear detecting device for a centrifugal projector.