JPH0411008Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a shot blasting machine for deburring plastic products, and more particularly to a circulating device for blasting material in the shot blasting machine.

(Prior art) Shot blasting machines use soft and lightweight abrasive materials such as walnut shells, apricot kernels, and nylon cut wire to remove burrs from plastic products. At the same time as the cleaning material is projected onto the plastic product, the cleaning material that has fallen to the bottom of the cleaning cabinet after being blasted and polished is sucked up using the suction force generated by the rotation of the impeller, and then supplied to the impeller. (For example, Utility Model Publication No. 41-21183).

(Problem that the invention aims to solve) By the way, in the conventional shot blasting machine of the above method, when taking out the polished product from the polishing cabinet, the power of the impeller drive motor is set to 0FF, and then the impeller is turned off. It is necessary to wait until the rotation speed of the impeller drops to a predetermined value and the abrasive material is no longer sucked up by the impeller, that is, until the projection of the abrasive material stops completely. When cleaning a new product, after turning on the power to the impeller drive motor, the rotation speed of the impeller increases to a predetermined value and the abrasive material is sucked up by the impeller. There is a waiting time until the material starts being projected.

When such a shot blasting machine is used to continuously process large quantities of plastic products in batches, long waiting times between batches have a significant impact on production efficiency. Furthermore, in the conventional shot blasting machine of the above type, the abrasive cabinet is sealed, and dust generated during the process of abrasive work (burrs removed from the product, abrasive material damaged due to blasting) etc.) are not discharged outside. When the abrasive material is sucked by the rotating suction force of the impeller, these dust particles are also attracted and projected, resulting in a large amount of dust electrostatically adhering to the product, degrading the quality of the product.

The present invention was developed in view of the above circumstances, and it aims to improve production efficiency by shortening the waiting time between batches of processed products, and to create a deburring shot for plastic products that does not allow dust to adhere to the products. The aim is to provide a blasting machine.

(Means for Solving the Problems) In order to achieve the above object, the present invention devises an abrasive circulation device in a shot blasting machine. That is, the present invention has an abrasive cabinet whose lower part is a storage tank for abrasive material, a blade chamber having a built-in impeller for projecting the abrasive material into the cabinet, an upper end connected to the blade chamber, and a lower end connected to the blade chamber. In a shot blasting machine for deburring plastic products, which is equipped with an abrasive suction pipe facing a storage tank, an outside air intake is provided in a portion of the suction pipe near the blade chamber, and the intake can be opened and closed. The present invention is also characterized in that the lower end opening of the suction pipe is disposed directly above the outside air inlet provided on the bottom surface of the abrasive material storage tank.

The configuration of the present invention will be described in detail below based on examples.

FIG. 1 is a front view of the shot blasting machine of the present invention, and FIG. 2 is a partially cutaway side view thereof. Note that the dashed line indicates the internal configuration. In the figure, reference numeral 1 denotes a hermetically sealed abrasive cabinet, and within the cabinet 1 there is disposed an abrasive drum 2 with one end open and the other end fixed to the tip of a rotating shaft of a rotating/rotating device 3. The polishing drum 2 is rotatable about the axis of the rotating shaft in the attitude shown by the dashed line in FIG. 2, and is also rotatable in the vertical direction. The opening at one end is designed to face in the vertical direction. The peripheral wall of the polishing drum 2 is provided with a through hole (not shown) having a diameter smaller than that of the plastic product housed in the drum 2.
A large number of holes are drilled through the holes at approximately equal intervals.

The ceiling of the abrasive cabinet 1 can be opened and closed, and a belt conveyor (a belt conveyor) is installed below the abrasive drum 2 in the cabinet 1 for transporting the polished plastic products out of the machine. (not shown) are arranged horizontally.

The lower part of the abrasive cabinet 1 is formed with an abrasive material storage tank 4, and the bottom surface of the storage tank 4 is raised above the floor by a predetermined distance. An outside air inlet 5 with a predetermined opening area is penetrated through the center of the bottom surface, and the outside air inlet 5 has a mesh that is finer than the particle size of the abrasive material contained in the storage tank 4. A wire mesh 6 is attached.

A blade chamber 8 having a built-in impeller 7 for projecting abrasive material into the cabinet 1 is provided on one outer side wall of the polishing cabinet 1, and a blade chamber 8 having a built-in impeller 7 for projecting the abrasive material into the cabinet 1 has an opening on the projection side connected to one end opening of the polishing drum 2 in a rotating posture. It is installed opposite to. Note that 9 is a drive motor for the impeller 7. Reference numeral 11 denotes a suction tube whose lower half portion is inserted into the inside of the cleaning cabinet 1 by passing through one side wall thereof, and the upper end opening of the suction tube 11 is connected to the suction side opening of the blade chamber 8. At the same time, its lower end opening faces directly above the outside air inlet 5 provided on the bottom surface of the storage tank 4.

Note that the lower end opening of the suction pipe 11 is the outside air inlet 5.
are approximately the same size. The suction tube 11
An outside air intake port 1 is provided in a portion adjacent to the blade chamber 8.
2 is provided substantially upwardly, and an outside air intake port 1 is provided on one outer wall of the cleaning cabinet 1.
A solenoid valve 13 is mounted directly above the solenoid valve 2 so as to face downward. The solenoid valve 1
A gate 15 is attached to the tip of the sliding shaft 14 of No. 3, and when the valve 13 is ON, the sliding shaft 14
is extended and the gate 15 opens the outside air intake port 12.
is sealed, and when the valve 13 is OFF, the sliding shaft 1
4, the gate 15 is designed to open the outside air intake port 12.

A ventilation hole (not shown) is bored through the upper part of one side wall of the grinding cabinet 1, and the ventilation hole is connected to a dust collector (not shown) outside the machine through a duct 16. There is a continuous connection. Further, a wire mesh (not shown) having a finer mesh than the particle size of normal abrasive material is attached to the ventilation port.

(Operation) The process of removing burrs from plastic products using the shot blasting machine configured as described above will be explained. A predetermined amount of soft, lightweight abrasive materials such as walnut shells, apricot kernels, and nylon cut wires are stored in the abrasive material storage tank 4, and the solenoid valve 13 is turned off to open the outside air intake port 1 of the suction pipe 11.
2 is opened, the drive motor 9 of the impeller 7 is first operated, and the rotation/rotation device 3 is operated to rotate the polishing drum 2 about the axis of the rotating shaft. Turn it clockwise in Figure 2 so that one end of the opening faces upward. Second, the ceiling of the polishing cabinet 1 is opened and one batch of burred plastic products is introduced into the polishing drum 2 from outside the machine. Third, the ceiling of the polishing cabinet 1 is closed, and the polishing drum 2 is rotated counterclockwise so that its one end opening faces the projection side opening of the blade chamber 8. Fourth, the solenoid valve 13
When the outside air intake port 12 of the suction pipe 11 is sealed by turning it ON, a negative pressure sufficient to suck up the abrasive material in the storage tank 4 is immediately generated in the suction pipe 11, and as a result, the abrasive material flows through the suction pipe 11. It is sucked and supplied to the blade chamber 8 through the impeller 7, and is projected toward the opening of the polishing drum 2 by the rotational centrifugal force of the impeller 7, thereby cleaning the products stored in the drum 2. Note that when the abrasive material in the storage tank 4 is sucked up by the suction pipe 11, at the same time, clean air from outside the machine is also sucked and supplied to the blade chamber 8 through the outside air inlet 5 on the bottom of the storage tank 4 and the suction pipe 11, and the impeller 7 into the abrasive cabinet 1.

The abrasive material projected toward the abrasive drum 2 falls to the bottom of the cabinet 1 through a through hole (not shown) in the peripheral wall of the drum 2, together with burrs and other dust removed from the product. The dust is sucked into a dust collector (not shown) outside the machine through a ventilation port (not shown) in the upper part of the cabinet 1 and a duct 16, and almost only the abrasive material is collected in the storage tank 4.

After a predetermined period of time has elapsed, as a fifth step, while the drive motor 9 of the impeller 7 continues to operate, the solenoid valve 13 is turned off and the outside air intake port 12 of the suction pipe 11 is opened. is suctioned and supplied to the chamber 8, and as a result, the suction tube 11
The negative pressure inside decreases, the abrasive material in the storage tank 4 is no longer sucked up, and the cleaning work is immediately stopped. Note that the outside air intake port 12 is provided near the blade chamber 8, and the diameters of the intake port 12 and the suction pipe 11 are set appropriately. It is smaller than that at the lower end opening, so that suction of the abrasive material is reliably cut off. Sixth, when the drum 2 is rotated counterclockwise so that one end of the opening faces downward, the products housed inside and from which burrs have been removed fall onto a belt conveyor (not shown), and the conveyor picks up the products. Carry it outside.

Seventh, the polishing drum 2 is rotated clockwise so that its one end opening faces upward. Eighth, the ceiling of the polishing cabinet 1 is opened and the next batch of burred plastic products is introduced into the polishing drum 2 from outside the machine. Ninth, the ceiling of the polishing cabinet 1 is closed, and the polishing drum 2 is rotated counterclockwise so that its one end opening faces the projection side opening of the blade chamber 8. 10th, turn on the solenoid valve 13
When the outside air intake port 12 of the suction pipe 11 is sealed, the impeller 7 continues to rotate even after the previous cleaning operation, so there is no space in the suction pipe 11 to suck up the abrasive material in the storage tank 4. Sufficient negative pressure is generated immediately, so that the abrasive material is sucked into the blade chamber 8 through the suction pipe 11.
It is supplied and projected onto the polishing drum 2 by the rotating centrifugal force of the impeller 7, and the product in the drum 2 is polished.

The above steps are considered as one cycle, and the same cycle is repeated thereafter, and a large amount of plastic products with burrs are continuously polished in batches.

(Effects of the invention) The first feature of the invention as described above is that an outside air intake is provided in the suction pipe near the blade chamber, and by opening and closing the intake, the power source of the impeller drive motor can be controlled. The purpose is to start and stop the projection of the abrasive material without turning it on and off, that is, while the impeller is still rotating. As a result, there is no need to wait until the rotational speed of the impeller decreases after the cleaning operation is completed, and the polished product can be immediately taken out of the cleaning cabinet. In addition, when it comes to cleaning the next batch of products, there is no need to wait until the rotation speed of the impeller increases, and the cleaning work can be carried out immediately.As a result, the waiting time between batches is shortened and production efficiency is improved. .

The second feature of the present invention is that an outside air inlet is provided at the bottom of the abrasive material storage tank in the abrasive cabinet, and the lower end opening of the suction tube is placed directly above the inlet. When the machine sucks up wood, it also sucks up clean air from outside the machine. This prevents the dust in the cabinet from being sucked into the blade chamber together with the abrasive material and being projected onto the product, preventing a large amount of dust from electrostatically adhering to the product surface, and as a result, the surface of the product after being polished. becomes even more beautiful.

Although the embodiment describes an abrasive drum type plastic product processing machine, the present invention is not limited to this type, and can also be applied to, for example, an endless belt conveyor type machine cited as the prior art. .

Furthermore, in the embodiment, a gate operated by a solenoid valve is used to open and close the outside air intake port in the suction pipe, but the present invention is not limited to such an opening/closing mechanism; for example, a gate operated by a cylinder is used. A gate, poppet damper, etc. may also be used.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of FIG. 1... Grinding cabinet, 2... Grinding drum,
4...Storage tank, 5...Outside air inlet, 7...Impeller, 8...Blade chamber, 11...Suction pipe, 12...Outside air intake, 13...Solenoid valve, 15...
Gate.

Claims (1)

[Scope of utility model registration request] A grinding cabinet 1 whose lower part is a storage tank 4 for abrasive material, a blade chamber 8 having a built-in impeller 7 for projecting the abrasive material into the grinding cabinet 1, and an upper end connected to the blade chamber 8. A suction pipe 11 for abrasive material whose lower end faces the storage tank 4 is provided, and the suction pipe 1
In the shot blasting machine for deburring plastic products, which has an outside air intake port 12 that can be opened and closed in the vicinity of the blade chamber 8, an outside air introduction port 5 is provided on the bottom of the storage tank 4, and the suction A shot blasting machine for deburring plastic products, characterized in that the lower end opening of the tube 11 is arranged directly above the outside air inlet 5.