JP2549137B2 - Shot blasting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shot blasting device capable of controlling the bending degree of a long member, which is a workpiece, by shot blasting. The shot blasting device of the present invention is suitable for a shot blasting device of a long member such as equilateral angle steel.

[Prior Art] Conventionally, a shot blasting device for double-sided processing is known in which shot blasting is simultaneously performed on two first and second polishing surfaces, which are two outer surfaces of a long member which are opposed to each other. This shot blasting device is a conveying device that conveys a long member in its longitudinal direction, an impeller that projects a shot onto the first polishing surface of the long member by centrifugal force, and a first drive device that rotates the impeller. A first impeller unit having, an impeller for projecting a shot by a centrifugal force onto a second polishing surface of a long member which is a back surface of the first cleaning surface, and a second drive device for rotating the impeller. And a control device for controlling the rotational speeds of the first drive device and the second drive device, the speeds of the first drive device and the second drive device being switched in several stages. Possible pole change motors are used.
In order to adjust the shot energy applied to the elongated member, the control device maintains the rotation speeds of the first and second drive devices equal, and the rotation speed of the first drive device and the rotation speed of the second drive device. And were controlling the speed at the same time. More specifically, the number of poles of each pole number conversion motor, which is the first and second drive devices, is always equal and changed at the same time.

[Problems to be Solved by the Invention] However, in the above-described conventional shot blasting apparatus, the long member that has been subjected to the double-sided shot blasting process is not suitable for the two shots and blasting due to a difference in the shapes of the two blasting and sweeping surfaces facing each other. It was possible to bend on either side of the surface. In particular, when a long member having a small thickness is subjected to double-sided shot blasting, the bending after the processing is large, and it may be necessary to mechanically correct it again. As one of the causes of the bending after the blasting, it is considered that the impact force or bending moment acting on the two blasting surfaces is different due to the difference in shape between the two blasting surfaces that are shot blasted.

In addition, in some applications, it may be desired to further bend the shot-blasted long member to form a desired shape. Even in this case, if the long member subjected to the double-sided shot blasting is bent in the opposite direction to the required bending direction, there is a drawback that the bending process afterward such as readjustment of the bender becomes complicated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a shot blasting device capable of controlling the bending degree of a long member by shot blasting.

[Means for Solving the Problems] A shot blasting device of the present invention is a transporting device for transporting a long member in its lengthwise direction, and a shot is projected onto a first polishing surface of the long member by centrifugal force. A first impeller unit having an impeller for rotating the impeller and a first variable speed drive device for rotating the impeller in a variable speed, and a second grinding and sweeping surface of the elongated member which is a back surface of the first grinding and sweeping surface. A second impeller unit having an impeller for projecting a shot by centrifugal force and a second variable speed drive device for rotating the impeller in a variable speed, the projected impingement unit for collecting the shot, and the first impeller unit and the first impeller unit. The shot supply device for supplying to the two impeller units, and one of the first variable speed drive device and the second variable speed drive device are controlled in speed relative to the other, and the length is increased. A control device that adjusts the degree of bending of the length member after shot projection.

The transfer device is a device that carries a long member that is a work into a projection chamber for shot projection and carries out the processed work. The roller conveyor device is an example of a linear transport device. It should be noted that the projection chamber is a space in which a shot processes a long member, and may have any chamber shape such as closed, partially shielded, and open.

Each of the first impeller unit and the second impeller unit is a centrifugal shot projection device that accelerates a shot by centrifugal force and projects the shot in a predetermined direction. The first impeller unit and the second impeller unit are respectively
It is composed of an impeller that rotates and accelerates and shoots a shot by its centrifugal force, and a variable speed drive device that rotates the impeller in a variable speed manner. The first and second impeller units are of the centrifugal acceleration type, and have the advantage that the shot speed can be made uniform compared to the compressed air type.

The control device is a device that controls the rotation speed of at least one of the variable speed drive devices. The controller can be manually set. In addition, the controller controls the speed of at least one of the bending degree detecting unit that detects the bending degree of the elongated member after processing and the first and second variable speed driving devices according to the output signal of the bending degree detecting unit. And a control unit.

At least the long members that are workpieces face each other 2
A metal member having two outer surfaces as a cleaning surface and at least one of the surfaces being longer than the length in the direction perpendicular to the surface. For example, as the workpiece, equilateral angle steel, unequal angle steel, flat steel,
Channel steel, H-section steel and W-section steel can be used.

As shots, in addition to steel balls, grids, sand, short-axis length wires, etc. can be used.

[Operation] In the shot blasting apparatus of the present invention, the transfer device transfers the long member that is the work to the projection chamber for shot projection. The first variable speed drive device of the first impeller unit and the second variable speed drive device of the second impeller unit respectively rotate the impeller, each impeller accelerates the shot by centrifugal force, and projects the accelerated shot in a predetermined direction. To do. Each projected shot is shot-blasted on two polishing surfaces of the long member which are opposed to each other.
The shot blast mentioned here includes shot peening processing in addition to polishing. The shot supply device collects the projected shots and supplies the shots to the first and second impeller units. The control device controls the speed of one of the first and second variable speed drive devices relative to the other of them, and as a result, adjusts the bending degree of the long member after shot projection.

In one example, the control device causes the rotational speeds of the first variable speed drive device and the second variable speed drive device to differ by a predetermined amount in order to reduce or eliminate the bending of the long member in the specific direction after sandblasting.

In another example, the control device bends the long member in a specific direction after sandblasting by a predetermined amount,
The rotation speeds of the first variable speed drive device and the second variable speed drive device are made different by a predetermined amount.

Example 1 Example 1 A schematic view of a shot blasting apparatus according to an embodiment of the present invention viewed from the side is shown in FIG. 1, a schematic view viewed from the front is shown in FIG. 2, and its shot projection operation is shown. This is shown in the schematic diagram of FIG.

This shot blasting device is a roller conveyor 1 as a conveying device for conveying the equilateral angle steel 100 as a work in its longitudinal direction, and a first impeller unit 2A, 2B for projecting a shot onto the equilateral angle steel 100 from below, Second impeller units 3A and 3B for projecting shots from above onto the equilateral angle steel 100, and first impeller units 2A, 2B and second
A shot supply device 4 for supplying the shots, which are steel balls having a diameter of 0.5 mm, to the impeller units 3A and 3B, and first impeller units 2A and 2B and a second impeller unit 3
A control device 5 for controlling the rotational speeds of A and 3B is used as a basic constituent element, and a steel support frame portion 6 for supporting each of the basic constituent elements and other auxiliary devices described later are provided.

The roller conveyor 1 includes eleven rollers 11 arranged in the carrying direction X and driven by a roller driving device (not shown), and four pressing rollers 12 arranged in the carrying direction X above the rollers 11. Each roller 11 and each presser roller 12
And a conveyor base (not shown) for rotatably supporting the. Transport speed of roller conveyor 1 is 1 ~ 10m / min
The range can be changed. Each roller 11 and each pressing roller 12 are made of urethane rubber baked steel pipe. The roller driving device includes a motor (not shown) and a chain (not shown) driven by the motor to rotate each roller 11. Each pressing roller 12 is arranged close to one roller 11, and seven equilateral angle steels 100 are inserted in parallel between the roller 11 and the pressing roller 12. The pressing rollers 12 are pressing members that are pressed downward by the air cylinders (not shown) to press the equilateral tetragonal steel 100 downward.

The first impeller units 2A and 2B are respectively a first impeller 21 that projects a shot (not shown) onto the first polishing surface 101 of the equilateral angle steel 100 by centrifugal force, and a first impeller.
It comprises a first variable speed drive device 22 for rotating the gear 21 in a variable speed manner, and a box body part 23 for supporting them. The first impeller units 2A and 2B are installed in the lower central portion of the roller conveyor 1 and are arranged in the horizontal direction perpendicular to the transport direction X, that is, in the width direction of the roller conveyor 1. First variable speed drive device 22
Is an inverter-controlled motor rated at 55kw and 4P. The first impeller 21 includes an impeller rotating shaft (not shown) directly connected to a rotating shaft (not shown) of the first variable speed drive device 22,
The centrifugal blade 24 is fixed to the impeller rotating shaft, and an outer frame portion 25 that rotatably supports the impeller rotating shaft and surrounds the centrifugal blade 24. The outer frame portion 25 has a shot feeding portion 26 for feeding the shot into the central portion of the centrifugal blade 24, and a guide duct (not shown) for controlling the projection direction of the shot to be projected. The guide duct is rotatably formed so as to change the shot projection direction.

The second impeller units 3A and 3B each have a second polishing surface 10 which is a rear surface of the first polishing surface 101 of the equilateral angle steel 100.
The second impeller 31 that projects the shot to 2 by centrifugal force
And a second variable speed drive device 32 that rotates the second impeller 31 in a variable speed manner. Second impeller unit 3A, 3B
Are installed on the lower side upper part of the roller conveyor 1 and are arranged in the width direction of the roller conveyor 1. The second variable speed drive device 32 is an inverter control motor rated at 55kw and 4P. The second impeller 31 includes an impeller rotating shaft (not shown) directly connected to a rotating shaft (not shown) of the second variable speed drive device 32, and a centrifugal blade 34 fixed to the impeller rotating shaft.
And a centrifugal blade that rotatably supports the impeller rotating shaft.
The outer frame portion 35 surrounds 34. Then, the outer frame portion 35 is provided with a shot feeding portion 36 for feeding the shot to the central portion of the centrifugal blade 34.
And a guide duct (not shown) for controlling the projection direction of the shot to be projected. The guide duct is rotatably formed so as to change the shot projection direction.

The shot supply device 4 includes a first impeller unit 2A,
2B and 2nd impeller unit 3A, 3B to equilateral angle steel
The shots projected on 100 are collected, and the first impeller units 2A and 2B and the second impeller unit 3 are again collected.
It is a device that supplies A and 3B. The shot supply device 4
Cabinet part 41 for collecting shots and cabinet part
A lower screw conveyor 42 installed in the width direction of the roller conveyor 1 at the bottom portion 47 of the 41, and a bucket elevator 43 standing upright on the side of the roller conveyor 1,
An upper screw conveyor 44 installed in the width direction of the roller conveyor 1 in the upper part of the cabinet section 41, a shot separator 45 installed immediately below the upper screw conveyor 44, first impeller units 2A, 2B and a second impeller unit 3A. , 3B and each of the shot separators 45 are connected to each other by a pipe portion 46 that enables shot transportation. The cabinet portion 41 is a steel plate box that is almost sealed, and has a shot blow-off chamber 49 below the inside thereof and a projection chamber 48 above the inside thereof. The projection chamber 48 is a space where a shot is projected onto the equilateral angle steel 100, and communicates with a shot blow-off chamber 49 below the shot chamber. The shot blowing chamber 49 is a space for collecting shots that have been projected and dropped.

The cabinet portion 41 includes the roller conveyor 1 and the first impeller unit 2 in the central portion of the roller conveyor 1.
It is installed so as to surround A and 2B and the second impeller units 3A and 3B. Further, the cabinet part 41 has a carry-in entrance 411 for carrying in a work therein and a carry-out exit 412 for detecting the work. The lower steel plate 410 of the cabinet part 41 is formed in a funnel shape in order to collect the falling shots on the bottom part 47 of the cabinet part 41.

The lower screw conveyor 42 is the bottom of the cabinet section 41.
47 shots at the bottom of the bucket elevator 43
Conveyor to transport to 430, driven by 5.5KW reduction motor.

The bucket elevator 43 is a conveyor that transports shots upward, and is driven by an 11 KW reduction motor.

The upper screw conveyor 44 is a conveyor that transports shots on the top 431 of the bucket elevator 43 to the shot separator 45, and is driven by a 5.5 KW reduction motor.

The shot separator 45 includes the first impeller unit 2A, 2B and the second impeller unit 3A via the respective pipe portions 46.
It is a device that distributes shots to 3B respectively, and has a built-in blower (not shown) for blowing off dust.
A shot flow rate adjusting valve 460 for adjusting the shot flow rate is installed in each of the piping portions 46 from the shot separator 45 to the first impeller units 2A and 2B and the second impeller units 3A and 3B, and the shot flow rate adjustments are performed. Each valve 460 is driven by a 0.1 KW reduction motor (not shown).

The accessory device (not shown) includes a dust separating / collecting device, a lubricating device, and a shot replenishing device, but the description thereof will be omitted. The shot supply device is a device that supplies the shot to the shot separator 45 and bypasses the shot.

The control device 5 is a device for controlling the rotation speeds of the first variable speed drive device 22 and the second variable speed drive device 32, and a block diagram thereof is shown in FIG. The control device 5 includes a first speed setting unit 52 that specifies the shot projection speed of the first impeller units 2A and 2B, a second speed setting unit 53 that specifies the shot projection speed of the second impeller units 3A and 3B, and a second speed setting unit 53. As a speed control unit that specifies the frequency and voltage of the three-phase AC voltage applied to the first variable speed drive device 22 and the second variable speed drive device 32 by the signals from the first speed setting unit 52 and the second speed setting unit 53. Of the arithmetic storage unit 51, the output signal of the arithmetic storage unit 51, the first inverter 56 that controls the frequency and voltage of the three-phase AC voltage applied to the first variable speed drive device 22, and the output signal of the arithmetic storage unit 51. A second inverter 57 for controlling the frequency and voltage of the three-phase AC voltage applied to the second variable speed drive device 32.
And consisting of

The operation of the shot blasting apparatus of this embodiment will be described below.

First, the roller conveyor 1 and the first impeller unit
2A, 2B, the second impeller units 3A, 3B, the shot supply device 4 and the auxiliary device (not shown) are operated, and the control device 5 is initialized.

The roller conveyor 1 conveys the equilateral angle steel 100, which is a workpiece, at a predetermined conveying speed by rotating the roller 11. The presser roller 12 of the roller conveyor 1 presses the equilateral angle steel 100 and rotates by the movement of the equilateral angle steel 100 to prevent the equilateral angle steel 100 from dancing during shot projection.

The first variable speed drive device 22 of the first impeller unit 2A rotates the first impeller 21, the first impeller 21 accelerates the shot by centrifugal force, and projects the accelerated shot in the X1 direction shown in FIG. The shot shot is equilateral angle steel
The first cleaning surface 101 of 100 is shot blasted. The first variable speed drive unit 22 of the first impeller unit 2B rotates the impeller 21, the first impeller 21 accelerates the shot by centrifugal force, and projects the accelerated shot in the X2 direction shown in FIG. The projected shot is shot blasted on the first polishing surface 102 of the equilateral angle steel 100. The first variable speed drive device 32 of the second impeller unit 3A rotates the second impeller 31, the second impeller 31 accelerates the shot by centrifugal force, and projects the accelerated shot in the X3 direction shown in FIG. The shot shot is the second of equilateral angle steel 100
The blast surface 103 is shot blasted. The first variable speed drive device 32 of the second impeller unit 3B rotates the second impeller 31, the second impeller 31 accelerates the shot by centrifugal force, and projects the accelerated shot in the X4 direction shown in FIG. The shot shot is shot blasted on the second polishing surface 104 of the equilateral angle steel 100.

The shot supply device 4 collects the projected shots and supplies them to the first and second impeller units 2A, 2B, 3A and 3B. The shot blow-off chamber 49 in the lower part of the cabinet unit 41 collects the shots projected in the projection chamber 48, the lower screw conveyor 42 transports the collected shots to the bucket elevator 43, and the bucket elevator 43 vertically moves the shots. transport. The upper screw conveyor 44 horizontally conveys the shot flowing from the bucket elevator 43 and supplies it to the shot separator 45 immediately below the upper screw conveyor 44. The shot separator 45 uses the inflowing shot for each pipe portion 46 and each shot flow rate control valve 460.
Again through the first impeller unit 2A, 2B and the second
Supply to the impeller units 3A and 3B.

When the projection speed of the first impeller units 2A and 2B is set in the first speed setting unit 52 of the control device 5, the calculation storage unit 51 determines the frequency of the first inverter 56 from the set projection speed.
Calculate f1 and voltage V1 and command it to the first inverter 56. The first inverter 56 controls the frequency of the output three-phase AC voltage to f1 and the voltage to V1. Similarly, the controller 5
When the projection speed of the second impeller units 3A and 3B is set in the second speed setting unit 53 of the calculation storage unit 51, the calculation storage unit 51 calculates the frequency f2 and the voltage V2 of the second inverter 57 from the set projection speed.
And instruct it to the second inverter 57. Second
The inverter 57 controls the frequency of the output three-phase AC voltage to f2 and the voltage to V2. First and second variable speed drive devices 2 controlled by the first inverter 56 and the second inverter 57
Reference numerals 2 and 32 rotate the first impeller 21 and the second impeller 31 at a rotation speed corresponding to the frequencies f1 and f2. The first impeller 21 and the second impeller 31 project a shot at a projection speed corresponding to each rotation speed.

This makes it possible to reduce the bending of the equilateral angle steel 100 after shot blasting, or to introduce a predetermined bending into the shot blasted equilateral angle steel 100. Bend correction is easy or unnecessary.

 The experimental results are shown below.

The sample isosceles angle steel 100 has a wall thickness of 3 mm and a side length of 30 mm, and the shot is a steel ball with a diameter of 0.5 mm. The transfer speed of the roller conveyor 1 is 5 m / min, and the shot projection density =
Shot projection amount / workpiece projection area is 85 kg / parallel m, shot projection speed of the first impeller units 2A and 2B is 64 m / sec initial speed, and second impeller units 3A and 3B
The shot projection speed is 73 m / sec. In this case, the equilateral angle steel 100 did not bend even after shot blasting.

The first impeller unit was used under the same conditions as the above experiment.
When the shot projection speeds of 2A and 2B and the second impeller units 3A and 3B are respectively set to an initial speed of 73 m / sec, the equilateral angle steel 100 after processing bends by 5 cm in the Y direction of FIG. 3 per 6 m in the longitudinal direction. .

It is considered that the bending of the equilateral angle steel 100 subjected to such double-sided shot blasting is mainly due to the shape of the equilateral angle steel 100. Such bending can be reduced or eliminated by changing the shot projection amount or projection angle of the first impeller units 2A, 2B and the second impeller units 3A, 3B. However, it was difficult to control the projection amount and projection angle precisely. Further, it is difficult to increase the projection amount above a certain level, and it is feared that the reduction of the projection amount cannot be performed uniformly and sufficiently.

As described above, in the present embodiment, in the shot blasting device for performing the double-sided shot blasting on the equilateral angle steel 100, the rotation speed of the first variable speed drive device 22 for processing the first polishing surface 101 and its 2nd for machining 2 polished surface 102
Since the rotational speed of the variable speed drive device 32 is configured to be independently controllable, the bending of the equilateral angle steel 100 after shot blasting is reduced or eliminated regardless of the shape and properties of the equilateral angle steel 100. can do. In some cases, the equilateral angle steel 100 after shot blasting can be given a predetermined bend.

Naturally, the shot blasting apparatus of this embodiment is an equilateral angle steel.
It can be used to prevent bending of long members other than 100 and to add bending.

The first variable speed drive device 22 and the second variable speed drive device 32 may be other continuously variable electric motors or multi-speed variable electric motors. The multi-stage variable speed electric motor having a small number of conversion stages is simple and inexpensive in speed control, and can be used in applications where precise bending control is not required.

The control device 5 is the first variable speed drive device during shot projection.
In order to make the rotation speed of 22 and the rotation speed of the second variable speed drive device 32 different, one of them may be speed-controlled, or both of them may be speed-controlled.

In addition, when correcting the bending of the equilateral angle steel 100 which is the work, the first variable speed drive device 22 and the second variable speed drive device 32 are used.
It is preferable to increase the rotation speed of one and decrease the rotation speed of the other. This makes it possible to suppress a large change in shot energy.

Embodiment 2 A shot blasting apparatus which is another embodiment of the present invention will be described below.

This shot blasting device is the same as the shot blasting device of the first embodiment except for the control device 50.

The control device 50 includes a bending degree setting unit 54 that sets the bending degree of the workpiece after processing, a bending degree detecting unit 55 that detects the bending degree of the workpiece after processing, the bending degree setting unit 54, and the bending degree detection unit 55. The output signal of the first inverter 56 and the second inverter 57
Calculation storage unit 51 as a speed control unit for calculating the rotation speed of
And a first inverter 56 and a second inverter 57. The bending degree detection unit 55 is a device that detects the bending of a shot-blasted work, and an image pickup device 58 that picks up the processed work and a video signal of the image pickup device 58 to calculate the bending degree of the work. And a signal processing circuit 59.

The operation of this shot blasting device will be briefly described below.

First, the bending degree setting unit 54 sets the bending degree of a work after processing in a memory (not shown) in the calculation storage unit 51, and the shot blasting apparatus is operated. Next, the bending degree detection unit 55
The processed image of the work is picked up by the image pickup device 58, the video signal thereof is processed by the signal processing circuit 59 of the bending degree detection unit 55 to detect the bending degree of the work, and the detected bending degree is calculated and stored in the arithmetic storage unit 51
Send to The arithmetic storage unit 51 compares the bending degree set in the memory with the bending degree detected by the bending degree detecting unit 55, and controls the first inverter 56 and the second inverter 57 based on the comparison result, Correct work bending.

EFFECTS OF THE INVENTION As described above, in the shot blasting device of the present invention, the first variable speed drive device of the first impeller unit that processes the first polishing surface of the long member is the first polishing and cleaning device. Since the speed is relatively controllable with respect to the second variable speed drive device of the second impeller unit that processes the second polished surface facing the surface, the long member subjected to the double-sided shot blasting process. Can be reduced or a predetermined bend can be given.

[Brief description of drawings]

FIG. 1 is a schematic view of a shot blasting apparatus according to an embodiment of the present invention as viewed from the side. FIG. 2 is a schematic view of the apparatus of FIG. 1 as seen from the front. FIG. 3 is a view showing the operation of the shot blasting apparatus shown in FIG. FIG. 4 is a block diagram of the control device 5 of FIG. FIG. 5 is a block diagram of a control device 50 used in a shot blasting apparatus according to another embodiment of the present invention. 1 ... Roller conveyor (conveyor) 2A, 2B ... First impeller unit 3A, 3B ... Second impeller unit 4 ... Shot supply device 5 ... Control device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-175955 (JP, A) JP-A-54-102683 (JP, A) Practical application Sho-63-60554 (JP, U)

Claims (5)

(57) [Claims] 1. A transport device for transporting a long member in its lengthwise direction, a first impeller for projecting a shot onto a first polishing surface of the long member by centrifugal force, and the first impeller can be shifted. A first impeller unit having a first variable speed drive device that rotates in a vertical direction, and a shot is projected by centrifugal force onto a second polishing surface of the elongated member, which is a back surface of the first polishing surface. A second impeller unit having a second impeller and a second variable speed drive device for rotating the second impeller in a shiftable manner; and collecting the projected shots into the first impeller unit and the second impeller unit. A shot supply device for supplying the first variable speed drive device and a second variable speed drive device for controlling the speed of one of the first variable speed drive device and the second variable speed drive device relative to the other of the first variable speed drive device and the second variable speed drive device. A shot blasting device, comprising: 2. The control device controls the rotational speeds of the first variable speed drive device and the second variable speed drive device independently of each other at the time of shot projection, so that the long member after the shot projection. The shot blasting apparatus according to claim 1, further comprising a speed controller that adjusts the bending degree. 3. The control device speed-controls the rotational speed of one of the first variable speed drive device and the second variable speed drive device at the time of shot projection to bend the long member after the shot projection. The shot blasting apparatus according to claim 1, further comprising a speed control unit that adjusts the degree. 4. A bending degree detecting section for detecting a bending degree of the shot long member, and a control signal output from the bending degree detecting section, wherein the control device controls the first variable speed drive device and the second variable speed driving device. The shot blasting device according to claim 1, further comprising: a speed control unit that speed-controls at least one of the rotation speeds of the variable speed drive device. 5. The shot blasting device according to claim 1, wherein the first and second variable speed driving devices are continuously variable electric motors.