JPH0326465A - Continuous system shot blasting device - Google Patents

Abstract

PURPOSE:To shorten the necessary time of a shot blasting stage and to improve the productivity by providing a driving source driving a screw conveyor with its rotation in the same direction. CONSTITUTION:The transfer speed of a work is decided by the rotations number control of screws 20, 21 by a driving source 3 and the inclinations of the screws 20, 21 set by the adjustment of an inclination adjusting member 8A. Namely, the work is continuously transferred at the transfer speed synchronized with the cycle time of a fore stage. Moreover, the work is forcibly reversed by the projecting part 2B for reversing the work in plural pieces provided with its projection on the outer periphery of the barrel part of a screw conveyor 2 and this reversal is repeated and so the projection of a shot becomes to be made easy and uniform for the whole area of the surface of the work. Consequently a proper blast having no projection unevenness can be executed in a short time, the transfer speed of the work is accelerated by synchronizing with the cycle time of a fore stage and the shot blast necessary time can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the following. SHIFT? Regarding the blasting device. [Prior Art] Conventionally, as a device used for shot blasting a workpiece that has a relatively complicated shape, such as a crankshaft, and is difficult to rotate (rotate), ■. Batch type blasting device shown in FIG. 7, ■. The screw conveyor type blasting device shown in Fig. 8 and ■. A hanger-type blasting device shown in Figure 9 is known. The batch-type blasting device mentioned above has a plurality of rollers Bl, B2, and B3 arranged in a casing A, and a belt C is wrapped around these rollers Bl, B2, and E3 to rotate them in the direction of arrow R at a predetermined speed. Along with rollers Bl and B3
A plurality of workpieces W are held by the slack portion of the belt C formed between the two, and shots are projected by shot projection means D onto the workpieces W which are being reversed as the belt C rotates. It is configured to do so. In addition, the screw conveyor type blasting haze described in ■ above,
Screw J-conveyor F j. , F2 is installed, a shot projection lower stage D is arranged at the dividing point G downstream of -12, and the workpiece W is carried from the conveyor F1 on the downstream side of 12 to the dividing station 0, and is further followed. In the process of being pushed by the work W and being carried out to the conveyor F2 on the downstream side, the shot projection stage f is arranged to project a shot.

Furthermore, the above hanger-type blasting device (■) supports a plurality of works W by a hanger H suspended from the casing A so that it can rotate around the vertical axis and be taken in and out, and rotates together with the hanger ■ around the @ vertical axis. It is configured to project a shot e onto a workpiece W to be shot by a shot projection stage F stage D.

[Problem to be solved by the invention] By the way, a workpiece such as the above-mentioned crankshaft,
Generally, by forging, products are produced continuously in a predetermined cycle time. Therefore, in terms of flow production management, even in the shot plus 1 process, it is required to perform continuous processing in 9 cycles in synchronization with the previous process (forging).

However, in the batch-type blasting described in ① above, since shot blasting is performed in a discontinuous manner, the required time is inevitably longer than that of shot blasting.
This can lead to a decline in production and an increase in costs, as it becomes impossible to synchronize with the previous king. Moreover, since the workpiece W is reversed at the slack portion of the belt C, the reversal state is relatively slow. Therefore, it is not possible to uniformly project the shot over the entire surface of the workpiece W in a short period of time, so the shot projection time becomes longer and the time required for the shot blasting process is further extended. In addition, the scraper-conveyor type blasting equipment mentioned in item ① above can be expected to perform continuous processing in a cycle roughly synchronized with the previous process, so compared to the batch-type blasting equipment mentioned above, it is possible to achieve a high level of sheet blasting. Although it seems possible to shorten the turnaround time, shorten cycle time, and improve production mix, in reality... At the hill and the dividing station G of the screw conveyors Fl and F2, the forward-feeding workpieces W interfere with each other and become entangled, which prevents their reversal. Therefore, it becomes difficult to project the shot evenly over the entire surface of the workpiece W, resulting in a decrease in quality and poor grip. Furthermore, the hanger type brass mentioned above
7, the work to attach and detach the work to the hanger H and the work to take it in and out of the hanger Hl casing A is complicated.
There are 41 problems such as poor working quality and complicated structure.

The present invention was developed in view of these circumstances, and it enables continuous processing in cycle time synchronized with the cycle time of the previous process, thereby reducing the required time and productivity. In both directions, shots can be easily and evenly projected over the entire surface of the workpiece, thereby improving quality and quality. It is our responsibility to provide a continuous shot blasting device that can improve yield.

1,000 steps to solve the problem a screw conveyor configured with at least one pair of screws arranged in a tunnel-shaped shell and extending from the loading port to the loading port; a drive source for driving the screw conveyor to rotate in the same direction; and the tunnel. A shot projection means is installed to close a penetration part of a selected outer wall of the shaped shell and project a shot toward the workpiece on the screw conveyor conveyance line, and the shot projection means is installed to close the penetration part of the selected outer wall of the screw conveyor, and the shot projection means projects the shot 1 to the workpiece on the outer periphery of the body of the screw conveyor. It has a protruding protrusion for reversing. [Operation] According to the invention, by controlling the rotation speed of the screw conveyor using the drive source, the conveyance speed of the 7-k can be set to a speed synchronized with the cycle time of the previous process. Additionally, the workpiece reversal protrusion protruding from the outer periphery of the screw conveyor's chest makes it possible to forcefully repeat the reversal of the workpieces on the conveyance line. As a result, it is possible to easily and evenly project the shot over the entire surface of the workpiece, so even if the workpiece transport speed is increased in synchronization with the cycle time of the previous process, the shot can be shot without unevenness in a short time. You can perform a blast. [Example] Hereinafter, an example of the present invention will be described in detail based on the drawings. Fig. 1 is a schematic front view showing the overall configuration of the present invention, Fig. 2 is a schematic side view thereof, and Fig. 3 is a schematic plan view thereof. It is equipped with a shell 1, a screw conveyor 2, a drive source 3 for rotating the screw conveyor 2 in the same direction, and a plurality of shot projection stages 4. The tunnel-shaped shell l is formed with a slight downward slope toward the downstream side in the conveyance direction indicated by arrow It's intimidating. The screw conveyor 2 is constituted by a pair of screws 20.21 of the same structure arranged in parallel at a predetermined interval in the width direction of the tunnel-shaped shell l, and these screws 20.21 are For example, it is constructed by sequentially joining a single block 2A as shown in FIG. 4 in the axial direction and joining them together. As shown in FIG. 3, both ends of the tunnel shell 1 in the longitudinal direction project slightly beyond the entrance 10 and the exit 11 in the longitudinal direction, that is, the two screws 20 and 21 are brought in. It is rotatably supported extending from the opening lO to the outlet l1, and is disposed within the tunnel-shaped shell l with an inclination angle approximately equal to the slope of the tunnel-shaped shell l. The upstream end of the screw 20.21 in the conveying direction is connected to the fifth
As shown in the figure, the plaque is attached via the bearing unit 5A.
8A, and the downstream end is rotatably supported by the sixth
As shown in the figure, it is rotatably supported by a bracket 6B via a bearing unit 5B. Then, in the vertical direction, a Extending guide holes 6a, 6b are formed, into which guide bins 7a, 7b extending from boxes 7A, 7B attached to both front and rear ends of the tunnel-shaped shell 1 are slidably inserted. I have let you. Also, boxes 7A and 7B
The bracket 8A,
The bottom surface of 6B is supported. Therefore, the inclination angle of the screw conveyor 2 can be set to a desired value by appropriately selecting and lowering the inclination angle adjustment members 8A and 8B. In FIGS. 1 to 3, a pair of screws 20 and 21 constituting the screw conveyor 2 are moved in the same direction by a rotational drive source 3, that is, a workpiece W.
can be simultaneously rotated in the direction of conveyance. The rotational drive source 3 is composed of a geared motor, and as shown in FIGS.
．． It is connected to 21. Note that the 8 power transmission system 30 includes a first sprocket 30a fixed to the output shaft of the drive source 3, a second sprocket 7}30b fixed to the upstream end of one of the screws 20, and a downstream side of this second sprocket}30b. A third sprocket 30c fixed to one screw 20 in the vicinity. A fourth subrocket 30d is fixed to the upstream end of the other screw 2l, and a first chain 30e is stretched between the first and second sprockets 30a and 30b.
and a second chain 30f that is stretched over the third and fourth sprockets 30c and 30d. 1 to 3, a plurality of penetration parts (not shown) are formed at predetermined intervals on the earthen wall of the tunnel-like shell 1, and each of these penetration parts is closed to form a well-known jot. A projection f stage 4 is attached, and shots are projected from each shot projection stage 4 in an elliptical direction onto a workpiece W being conveyed along a conveyance line C of the conveyor.

Each of the screw conveyor 2's screw conveyors 2A (see Fig. 1), which has screw conveyor 2, is heated evenly in the circumferential direction on the outer circumference of its body, and A plurality of convex portions 2B for reversing the workpiece are protruded at equal intervals in the force direction, that is, a plurality of convex portions 2B for reversing the workpiece are protruded from the outer periphery of the body of the screw conveyor 2 as shown in ffi 1 to 3. The configuration is as follows. In addition. 9 in the figure is a screw conveyor for shot recovery;
9A shows its driving source, and 9B shows the shot circulation tank. Next, the operation of the above-mentioned configuration will be explained.

&． A 7-piece W (for example, a crankshaft) is carried into the tunnel-shaped shell 1 through a loading port 0.

1》. The workpiece W carried in at step a is driven by the drive source 3
At the conveyance speed determined by the rotational speed control of the screw conveyor 2 performed by the screw conveyor 2 and the inclination angles of the screws 2O and 21 set by the adjustment of the oblique angle adjustment parts 8A and 8B, the output port is moved along the conveyance line C. It is transported towards 1l.

C. A plurality of work reversing protrusions 2B protruding from the outer periphery of the body of the screw conveyor 2 interfere with the work W and cause the work W to
What's more, this reversal is repeated.
That is, the workpiece W is transported toward the exit 11 at a predetermined transport speed while repeatedly being reversed.

a. A shot is projected from the shot projection means 4 onto the surface of the workpiece W which is being conveyed while being reversed at b and c. Since the workpiece W is conveyed while being repeatedly reversed, the shot is easily and evenly projected over the entire surface of the workpiece W, making it possible to carry out effective shot blasting in a short time. e. The workpiece W that has reached the unloading port 11, that is, the workpiece W that has been subjected to sheet plast, is taken out of the machine and stored as appropriate. f. The shots projected from the 1,000-stage shot projection stage 4 in step d above are collected by the shot collection screw conveyor 9 into the shot collection tank 9B, from where they are returned to the shot supply means (not shown) by an elevator (not shown), and then shot again. 1/Projection 4, and from there the circulation of the projected path will be repeated. Shot blasting is performed in the f order of k a...f.

As described in the above h, the screw 20 is set by controlling the rotation speed of the screw 20, 21 by the drive source 3 and adjusting the inclination angle m adjustment members 8A and 8B.
．． The conveyance speed of the workpiece W is determined by the inclination angle of 21.
can do. That is, the previous process (for example, forging process)
It becomes possible to continuously transport the work W at a transport speed synchronized with the cycle time of convex part 2B
Since the arc 27 is forcibly reversed and this reversal is repeated, the shot at d can be projected easily and uniformly over the entire surface of the workpiece W. Therefore, it is possible to perform a proper +1 shot without uneven projection in a short time, so the transport speed of the workpiece W is set to speed < 1, in synchronization with the cycle time of the previous process, and the required rate of the sheet blasting process is increased. It becomes possible to shorten the time, and at the same time, it is possible to ensure improvement in quality and waste. In the embodiment described above, the screw conveyor 2 is constructed by a one-to-one pair of screws 20 and 2l, but
The present invention is not limited to the above-described embodiments, and the number of screws used and the number of screw conveyors made up of screws can be set by selecting any multiple of 1:1 to J2. Further, although the shot projection means 4 is installed by closing the upper wall of the tunnel-shaped shell 1 in the example 4I, the installation position is not limited to the above embodiment. . For example, {II! 11! It is also possible to have a structure in which a penetration part is formed in the upper part, and the shot projection means 4 is attached by closing this penetration part. Furthermore, the screw conveyor 2 may be arranged horizontally without being inclined. Even if the size of the workpiece W changes, by adjusting the spacing between the screws 20 and 21 that make up the screw conveyor 2, it is possible to properly convey the workpiece and perform shot blasting. [Effects of the Invention] Since the present invention is configured as described above, it produces the following effects. By controlling the rotation speed of the screw conveyor using the drive source, it is possible to set the conveyance speed of the workpiece to a speed that is synchronized with the cycle time of the previous process and perform continuous processing, reducing the time required for the shotplast process. This can improve productivity. In addition, the workpiece reversal protrusion protruding from the outer periphery of the screw conveyor body allows the workpieces on the conveyance line to be forcibly repeatedly reversed, allowing shots to be easily and evenly distributed over the entire surface of the workpiece. It becomes possible to project. Therefore, even if the workpiece conveyance speed is increased in synchronization with the cycle time of the previous process, proper blasting without uneven projection can be performed. Therefore, in addition to reducing the time required for the shot blasting process,
It is possible to improve quality and yield.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is a schematic front view showing the overall configuration of the present invention, FIG. 2 is a schematic side view, FIG. 3 is a schematic plan view, and FIG. Figure 4 is an enlarged side view partially showing a single block in cross section, Figure 5 is an enlarged side view partially showing the support structure at the upstream end of the screw conveyor, and Figure 6 is the support structure at the downstream end of the same block. FIG. 7 is a schematic explanatory diagram of the conventional structure; FIG. 8 is a schematic explanatory diagram of another conventional example; and FIG. 9 is a schematic explanatory diagram of another conventional example. This is a diagram. l...Tunnel-shaped shell, 2...Screw conveyor, 2B...Protrusion for reversing the workpiece, 3...Drive source, 4
... Shot projection means, 10... Carrying entrance, 11...
・Export port, 20.21...Screw, C...Conveyor transfer line, W...Workpiece.

Claims (1)

[Claims] (1) A tunnel-shaped shell in which a workpiece inlet and an outlet are formed on both sides in the longitudinal direction, and at least one pair of screws disposed within the tunnel-shaped shell and extending from the inlet to the outlet. a screw conveyor configured by a screw conveyor, a drive source for driving the screw conveyor to rotate in the same direction, and a screw conveyor installed by blocking a penetration part of a selected outer wall of the tunnel-like shell and directed toward the workpiece on the screw conveyor conveyance line. What is claimed is: 1. A continuous shot blasting device, comprising: a shot projection means for projecting shots, and a convex portion for reversing a workpiece is provided protrudingly provided on the outer periphery of the body of the screw conveyor.