JPH0448929Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a shot blasting device.

[Conventional technology]

Generally, the apparatus shown in FIGS. 4 and 5 is used as a shot blasting apparatus for polishing steel materials such as billets that are conveyed at intervals. In the figure, reference numeral 1 denotes a cabinet, and four shot projection devices 4 project shots onto a material 3 to be polished, which is conveyed through the cabinet 1 by rollers 2, thereby performing cleaning. The shot after being projected is discharged from the lower hopper portion 1a of the cabinet 1 by a screw conveyor 5,
The liquid is transported upward by the bucket elevator 6 and returned to the shot projection device 4 from the upper hopper 7 via the flow control device 8. 9 is a screw conveyor for transfer within the upper hopper 7. As shown in FIG.
A valve body 13 to which is fixed is swingably mounted, and the valve body 13 is opened and closed by an air cylinder 15. Reference numeral 16 denotes an opening adjuster consisting of an electric direct-acting actuator connected between a bracket 17 fixed to the casing 14 and an air cylinder 15, which adjusts the amount of protrusion of the rod 18 to adjust the opening amount when the valve body 13 is opened. This is for adjusting the opening degree of the partition plate 11 to adjust the shot flow rate.

[Problem that the invention attempts to solve]

By the way, the shot blasting device 19 having the above configuration
In this case, the front end of the material to be polished 3 is connected to the cabinet 1.
It is necessary to repeat the cycle in which the shot starts firing when it reaches the cleaning position in the middle and ends when the rear end of the material to be polished 3 passes the polishing position. The flow is controlled by opening and closing the flow rate control device 8. That is, the valve body 13 is kept in a fully closed state by the air cylinder 15, opened at the start of projection, and returned to the fully closed state at the end of cleaning. However, this method causes a delay in the start-up of the shot flow rate when the valve body 13 is opened, an initial outflow of a large flow rate shot due to an excessive accumulation of shot in the upper part of the valve body 13, and subsequent fluctuations in the shot flow rate. However, there was a problem that the shot flow rate was not stable.

In general, depending on conditions such as the shape, material, transfer speed, and shot projection speed of the material to be polished 3, the optimum shot flow rate value (best shot consumption rate) that can perform highly hardening cleaning with a small shot flow rate is determined. However, if the shot flow rate is unstable as described above, it is difficult to maintain the above-mentioned optimum shot flow rate value, which is the reason why economical cleaning cannot be performed.
Further, there were also problems such as the motor tripping accident of the shot projection device 4 due to the projection of the large flow rate shot at the start of the cleaning process.

This invention is an attempt to solve the above-mentioned conventional problems and to provide a shot blasting device that can perform shot blasting intermittently with a stable shot flow rate.

[Means for solving problems]

However, the device of this invention is a shot blasting device that blasts shot supplied from an upper hopper onto a material to be polished in a cabinet using a shot projection device, and changes the shot passing area to adjust the shot flow rate. A flow rate adjustment device for adjusting the shot flow is connected to the upper hopper, a switching device for switching the shot flow in two directions is connected to the outlet side of this flow rate adjustment device, and one shot outlet of this switching device is connected to the shot projection side. The shot blasting apparatus is characterized in that the other shot outlet is connected to a bypass pipe opening into the cabinet.

[Effect]

In the shot blasting device of this invention,
The flow rate adjustment device is used by setting it to a certain opening degree (shot passage area) depending on the material to be polished. A constant flow rate of the shot stream passing through the flow regulating device is supplied to a shot projection device or a bypass line by a switching device. Since it is only necessary to switch the switching device to the shot projection device side at the start of projection, a stable shot flow at a constant flow rate is supplied to the shot projection device and projected from the start of projection. If the switching device is switched to the bypass pipe side at the end of projection, the shot flow will flow into the cabinet via the bypass pipe, but since it is a free fall without passing through the shot projection device, there is little wear on the shot.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 3.

In the figure, the same parts as in FIGS. 4 and 5 are designated by the same reference numerals and detailed explanations will be omitted. 21 is a flow rate adjustment device connected to the upper hopper 7, 22 is a switching device connected to the outlet side of this flow rate adjustment device 21, and 23 is a connection between one shot outlet 24 of this switching device 22 and the shot projection device 4. Shot supply pipe, 25 is switching device 2
This is a bypass line connected to the other shot outlet 26 of 2, and its lower end opens into the cabinet 1. The flow rate adjustment device 21 has a structure shown in FIG. 2, and has a configuration in which the air cylinder 15 is removed from the conventional flow rate control device 8. are connected,
The shot flow rate is adjusted by swinging the valve body 13 by operating the opening adjuster 16 to change the opening area of the lower end of the inflow pipe 10. In addition, in case the shot blasting equipment is stopped, the rod 18
It is preferable that the valve body 13 be in a fully closed state when it is extended to its maximum extent. Furthermore, the switching device 22 has a structure shown in FIG. is attached to the casing 27, and the valve body 2 of the casing 27 is
At the lower position of 8, there are shot outlet ports 24 and 26 that open opposite the left and right tilted positions of the valve body 28.
is provided. 27a is a partition wall fixed to the bottom of the casing 27. Further, an outlet 14a at the lower end of the casing 14 of the flow rate adjustment device 21 is opened above the valve body 28.

In the shot blasting device 31 configured as described above, the opening degree of the valve body 13 is set by the flow rate adjustment device 21 so as to obtain a desired shot flow rate, and then the valve body 28 is oscillated by the air cylinder 30 of the switching device 22. The shot flow is supplied to and stopped from being supplied to the shot projection device 4 only by dynamic switching. With the valve body 28 positioned on the shot outlet 26 side and a constant flow rate of shot flowing into the cabinet 1 via the bypass pipe 25, the valve body 2
8 to the shot outlet 24 side, a constant flow rate of shot flow is supplied to the shot projection device 4 via the shot supply pipe 23 and projected without fluctuation in the shot flow rate. At the end of shot projection, the valve body 28 may be switched to the shot outlet 26 side.
In this way, it is possible to always project a shot at the optimum shot flow rate value (best shot consumption value) for each workpiece 3 that is conveyed at intervals,
It is economical and there is little variation in the cleaning effect of the material to be polished.

This invention is not limited to the above-described embodiments; for example, the flow rate regulating device 21 may be one in which a flat valve body is linearly driven instead of the swinging type valve body 13, or one in which the opening degree of the valve body is adjusted. A method in which this is performed manually may also be used. Also, the switching device 22
Alternatively, instead of the swingable valve body 28, a type other than the above may be used, such as one in which the casing 27 side swings relative to the fixed valve body 28. Furthermore, from cabinet 1 to upper hopper 7
The shot return means may also be other than the above embodiment.

[Effect of idea]

As explained above, according to this invention, it is possible to perform shot projection intermittently with a stable shot flow rate with little fluctuation, improving the shot consumption rate and reducing variations in the cleaning effect of the material to be polished. It can be measured.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal sectional front view of a shot blasting device showing an embodiment of this invention, Fig. 2 is a longitudinal sectional view of the flow rate adjustment device shown in Fig. 1, and Fig. 3 is a longitudinal sectional view of the switching device. , FIG. 4 is a partially longitudinal front view showing an example of a conventional shot blasting device, and FIG.
FIG. 3 is a longitudinal cross-sectional view of the flow control device shown in the figure. 1... Cabinet, 4... Shot projection device, 7... Upper hopper, 13... Valve body, 14...
Casing, 16...Opening degree controller, 21...Flow rate regulator, 22...Switching device, 23...Shot supply pipe line, 24...Shot outlet, 25...Bypass pipe line, 26...Shot flow Exit, 27...
Casing, 28... Valve body, 30... Air cylinder, 31... Shot blasting device.

Claims (1)

[Scope of utility model registration request] In shot blasting equipment, which blasts the shot supplied from the upper hopper onto the material to be polished inside the cabinet using a shot projection device to perform polishing, a flow rate adjustment device is used to adjust the shot flow rate by changing the shot passing area. A switching device connected to the upper hopper and switching the shot flow in two directions is connected to the outlet side of this flow rate regulating device, and one shot outlet of this switching device is connected to the shot projection device, and the other shot outlet is connected to the above shot projection device. A shot blasting device, characterized in that each of the above-mentioned shot blasting devices is connected to a bypass pipe line opening into the cabinet.