JPH08290116A - Multistage screen for granular body - Google Patents

Abstract

PURPOSE: To stop a screen at a specified position when shaking is finished by providing the screen with a mechanism for electrically detecting the rotation of the rotary part of a movement changing part and a controller for stopping a drive source based on a detection signal from the detecting mechanism when the preset stop condition is established. CONSTITUTION: A position detecting signal from a position detector 23 is counted up by a counting means 36. When the count value reaches the preset frequency, a motor stop signal is transmitted to a motor control means 28 from a comparator means 37, the power supply to a motor 15 is stopped, a brake 30 is actuated, and the output shaft and turntable are stopped. Only an extremely short time is taken from the time when the position detecting signal is transmitted from the detector 23 through the detecting board of the turntable until the power supply to the motor 15 is stopped, and hence the moving distance of a frame after the position detection signal is transmitted from the detector 23 is neglected. Accordingly, the detecting board acts on the detector 23 in the final reciprocation of the frame, and the frame is stopped at a specified position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage sieving apparatus for sieving each particle size of ores, coal, coke, etc. in order to measure the particle size. Is stopped at a predetermined position and the sieve is carried out by mechanical means such as a robot.

[0002]

2. Description of the Related Art A multi-stage sieving device is a moving table type in which sieves are stacked on a moving table having wheels and the moving table is reciprocated, and an arm is provided between a pair of vertical shafts having eccentric cams vertically. When the vertical axis is rotated and the vertical axis is rotated, the sieve set on the shaking table is roughly divided into the low tap type that makes a horizontal circular motion due to the action of the eccentric cam. There is also proposed one having a screen positioning mechanism for moving the screen.

For example, as a moving table type multi-stage sieving device, as described in Japanese Patent Publication No. 3-80553, a moving frame main body which is movable on wheels on a base, and this moving body. A shaking mechanism that vibrates the frame body, a support frame that stands upright on the moving frame body, a sieve clamp mechanism that is provided on one side of this support frame, and a support on the moving frame body between the support frames. The moving roller and a screen positioning mechanism that is erected on the base. Then, the sieve positioning mechanism sets up a support stand at a position where the sieve placed on the moving roller is sandwiched from both sides, and one of the support stands presses the sieve on the moving roller to the opposite side by driving the cylinder. A plate is provided, and the other support is provided with a stopper with which the sieve pressed by the contact plate comes into contact.

The low tap type multistage sieving device is
For example, as disclosed in Japanese Examined Patent Publication No. 3-80550, a vertical drive shaft provided along one of a pair of support columns standing upright on the base and a vertical drive shaft provided along the other support column. Driven shafts, eccentric blocks fixed to the upper and lower parts of both shafts, an upper arm fitted to the upper eccentric block, and a vibrating table fitted to the lower eccentric block,
It is composed of a sieve holding plate which is guided by two vertical rods connected to the upper arm and the vibrating table and is moved up and down by a cylinder, and a sieve positioning mechanism which is erected from the base. Then, the sieve positioning mechanism vertically installs a support frame on the base, and horizontally fixes four guide bars facing the front of the support frame on both sides of the support frame on the front surface of the support frame. Is slidably fitted, a V-shaped contact plate is fixed to the front surface of the guide plate, and a cylinder is provided at the rear part thereof, and the V-shaped contact plate is moved forward by the cylinder to align the sieve at a predetermined position. It was done like this.

[0005]

However, in the above-mentioned conventional multistage sieving apparatuses, it is necessary to move the sieve to a predetermined position by driving the cylinder after the shaking operation of the sieve is completed. . Therefore, it takes time from the end of shaking of the sieve to the state where the sieve can be carried out, resulting in poor work efficiency.

Further, since the mechanical structure of the positioning mechanism of the sieve is complicated, it is necessary to spend a great deal of labor and time for manufacturing, and since the sieve is forced to move by the driving of the cylinder, a failure of the cylinder or the like occurs. As a result, there is a concern about troubles in the entire device.

Further, in the conventional low-tap type sieving apparatus, the hammer mechanism cannot be operated unless a predetermined number of sieves are always stacked on the vibrating table to secure the height of the sieve. For this reason, there may be a case in which extra sieves, which are unnecessary for the original sieving, have to be additionally stacked as spacers, which makes the handling troublesome.

Therefore, according to the present invention, when the shaking is completed, the sieve can be stopped by adjusting it to a predetermined position.
An object of the present invention is to provide a multi-stage sieving device that can operate a hammer mechanism without stacking extra sieves.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object. According to the first aspect of the present invention, there is provided a movable frame which is movable on a base via wheels. A deceleration unit that decelerates the rotation of the drive source, a motion conversion unit that converts the rotation output of the deceleration unit into one reciprocating motion for one rotation, and the reciprocating motion converted by the motion converting unit into a moving frame. A shaking mechanism that has a transmitting section that transmits, a vibrating mechanism that vibrates the moving frame, a sieve clamp mechanism that clamps a sieve placed on the moving frame at a predetermined position with respect to the moving frame, and a motion converting section of the motion converting section. A detection device that electrically detects rotation of the rotating portion; and a control device that stops the drive source based on a detection signal from the detection mechanism when a preset stop condition is established by an external operation. Powder Body is a multi-stage sieving device.

According to a second aspect of the present invention, a vertical drive shaft is provided along one of a pair of columns that are erected on the base so as to face each other, and a vertical driven shaft is provided along the other column. ,
Eccentric means fixed to the upper and lower parts of both shafts, an upper arm fitted to the upper eccentric means, a lower arm fitted to the lower eccentric means, and a sieve support that moves horizontally in unison with the lower arm. And a drive mechanism that rotationally drives the drive shaft by the rotational force of the drive source, a detection mechanism that electrically detects the rotation of the drive mechanism, and a detection signal from the detection mechanism when a preset stop condition is established by an external operation. And a control device for stopping the drive source based on the above.

According to a third aspect of the present invention, in addition to the structure of the second aspect, the sieve pedestal is guided by a shaft erected from a lower arm so as to be able to move up and down, and the sieve placed on the sieve pedestal is It is equipped with a hammer mechanism for tapping.

[0012]

In the sieving apparatus according to the first aspect, the sieve clamp mechanism allows the sieves stacked on the moving frame to be aligned and clamped at a predetermined position with respect to the moving frame, and in this state, the shaking mechanism. When the drive is activated, the rotation of the drive source is converted into reciprocating motion by the motion converting unit and transmitted to the moving frame, so that the moving frame repeats the reciprocating linear motion with the sieve mounted. Then, when the moving frame is repeatedly reciprocated until a preset stop condition is satisfied by an external operation, the powder particles in the sieve are sieved by this. While the moving frame continues the reciprocating motion, the detection mechanism electrically detects the rotation of the rotating part of the motion conversion unit, and when the preset stop condition is established by the external operation, the detection signal from the detection mechanism is output. Based on this, the drive source is stopped. Therefore, the position where the moving frame stops is the same predetermined position every time.

In the sieving apparatus according to the second aspect, when the vertical drive shaft provided on one of the pair of struts facing each other on the base by the drive source is rotationally driven, the eccentric means causes the vertical movement of the vertical drive shaft. The arm rotates in the horizontal direction together with the sieve support so that the powder particles in the sieve stacked on the sieve support are sieved. While the sieve support is rotating, the detection mechanism electrically detects the rotation of the drive mechanism, and when the preset stop condition is satisfied by an external operation, the drive source is activated based on the detection signal from the detection mechanism. Stop. Therefore, the stop position of the sieve support is the same predetermined position every time.

According to the third aspect of the invention, since the screen support can be raised by being guided by the shaft erected from the lower arm, regardless of the number of sieves stacked on the screen support, the screen support is supported. By adjusting the height of the table, the uppermost sieve can be adjusted to the height of the hammer of the hammer mechanism.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a movable stage type multistage sieving apparatus 1, and FIG. 2 is a plan view of this sieving apparatus 1.

The moving frame 2 which is a moving table has wheels 3, and is reciprocated linearly in the left and right directions of FIGS. 1 and 2 along a rail 5 on a base 4 by a shaking mechanism. Further, on both sides of the moving frame 2, a sieve clamp mechanism for clamping the sieve 6 placed on the moving frame 2 at a predetermined position with respect to the moving frame 2 is fixed so that it can be moved up and down while being guided by the guide groove 7. The fixing cylinder 8 is provided in the horizontal direction, and the fixing plate 9 is attached to the tip of the rod of the fixing cylinder 8. Further, on the moving frame 2, the sieve holder 10 is provided so as to face the lower ends of both the fixing plates 9 so that the sieve holder 10 can be raised and lowered, and the rods of the lifting cylinders 11 are connected to the four corners of the sieve holder 10. is there.

Therefore, the bottomed dish receiver 12 is first placed on the sieve receiver 10 with the sieve receiver 10 lowered, and the sieves 6 ... Are stacked on the receiver 12 in order from the smallest mesh. When the fixing cylinder 8 is operated in this state, the fixing plate 9 can press the sieves 6 in the horizontal direction to align them at a predetermined position with respect to the moving frame 2. A robot arm or the like may be used to stack the sieves 6 ... Then, when the lifting cylinder 11 is operated, the sieve receiving base 10 rises together with the sieves 6 ... When the uppermost sieve 6 acts on the rising limit detector 13, the lifting cylinder 11 stops, and this rising state is maintained. To do. Therefore, if the hammer mechanism 14 is provided on the upper part of the moving frame 2, the hammer mechanism 14 strikes the sieve 6 by raising the sieve support base 10 regardless of the number of sieves 6 stacked on the sieve support base 10. be able to. It should be noted that when the sieve support base 10 rises, the fixing plate 9 and the fixing cylinder 8 are also guided by the guide groove 7 and ascend.

The vibrating mechanism is arranged on one side of the base 4 and converts the variable brake motor 15 as a drive source having a speed reducer as a speed reducer into a reciprocating motion. It is configured in a crank type from a rotating shaft portion 16 as a motion converting portion, and a connecting rod 17 as a transmitting portion that transmits the force converted into one reciprocating motion by one rotation of the rotating shaft portion 16 to the moving frame 2. The output shaft of the variable speed motor 15 with a brake mounted on the motor base 18 and the input side of the rotary shaft portion 16 are connected via a sprocket and a chain.

The rotating shaft portion 16 has a disk 20 having an amplitude adjusting plate 19 fixedly attached to one end of a shaft supported by a bearing on the base 4, and the connecting rod 17 is attached to the amplitude adjusting plate 19 which is slidable in the long groove 21. Is pivoted at one end. In addition,
The other end of the connecting rod 17 is pivotally attached to a bracket provided on one side of the moving frame 2. The amplitude adjusting plate 19 is
It can slide in a long groove 21 formed in the diameter direction of the disk 20. Therefore, if the eccentric amount is changed by adjusting the axial position of the connecting rod 17 by sliding the amplitude adjusting plate 19, the stroke of the linear reciprocating motion, that is, the amplitude of the moving frame 2 changes.

Further, the shaking mechanism is provided with a detecting mechanism for electrically detecting the rotation of the motion converting portion. In this detection mechanism, in the present embodiment, a magnetic detection plate 22 is fixed to the outer periphery of the disk 20 as an acting portion, and a reed switch that detects passage of the detection plate 22 and sends a signal is used as a position detector 23 for the base 4. Fixed on top. Therefore, when the disk 20 rotates and the moving frame 2 reciprocates, the detection plate 2
Each time 2 passes over the reed switch 23, it acts so that the reed switch 23 sends out a signal. Moreover,
The detection plate 22 acts on the reed switch 23 at the same phase every time, in other words, the moving frame 2 is in the same position. If the position of the moving frame 2 at this position is set to a predetermined position, the moving frame 2 is moved. The reed switch 23 sends a signal every time 2 passes a predetermined position. Therefore, when the reed switch 23 sends a signal and the operation of the motor 15 is stopped to stop the disk 20,
The moving frame 2 can be stopped at the predetermined position. The position at which the moving frame 2 stops is the same position each time it stops, and if this position is set as the predetermined position, the loading / unloading means such as the robot arm can be reliably positioned.

The detection mechanism is not limited to the combination of the magnetic detection plate 22 and the reed switch 23, but may be a detection device having an optical structure such as a photo sensor or a micro limit switch. Although it may be detected by a mechanical structure, it is preferably a non-contact type if possible.

Generally, when measuring the particle size of a powder or granular material,
A predetermined time or a predetermined number of times is set, and the shaking of the sieves 6 piled up is continued during this time, and when the set time or number of times is reached, the shaking is stopped. Therefore, if the above-described predetermined time or number of times is set as a stop condition in the control device, the shaking motion is terminated when the stop condition is satisfied, and the sieve 6 can be stopped at a predetermined position.

The control device 25 shown in FIG.
When the position detection signal from the position detector 23 is received after receiving the time-up signal from the set time storage unit 27 and the set time storage unit 27, the motor control unit 2
8, a stop timing control means 29 for sending a motor stop signal, and a start signal to supply power to the motor 15 to start the motor 15 and release the brake 30. At the same time, the timer 26 of the set time storage means 27 measures time. It is composed of a motor control means 28 for sending a start signal and the like, and the set time storage means 27 is connected to a setting operation section 31 for setting a shaking time by an external operation.

When the start switch 32 is operated after setting the shaking time (for example, 15 minutes) in the set time storage means 27 by operating the setting operation portion 31, a start signal is sent to the motor control means 28, and this Upon receiving the signal, the motor control means 28 supplies electric power to the motor 15 to start the operation, and at the same time releases the brake 30, simultaneously the set time storage means 2
A clock start signal is sent to 7. Therefore, the disk 20 of the shaking mechanism can start rotating to move the moving frame 2 from the predetermined position to the left and right linear movements in the drawing. Also,
The set time storage means 27 starts measuring time when receiving the measuring start signal.

When the disk 20 rotates, the magnetic detection plate 22
A detection signal is sent from the position detector 23 to the stop timing control means 29 every time the vehicle passes over the position detector 23, and the stop timing control means 29 sets the set time storage means 2.
The motor stop signal is not sent until the time-up signal from 7 is received. Therefore, each time the disk 20 makes one revolution, the moving frame 2 makes one reciprocating linear motion, and the disk 2
The moving frame 2 continues a reciprocating linear motion while 0 continues to rotate.

Then, a preset time (for example, 15
Minute) has elapsed and a time-up signal is sent from the set time storage means 27 to the stop timing control means 29, the stop timing control means 29 then moves to the position detector 2
Upon receiving the position detection signal from No. 3, the motor stop signal is sent to the motor control means 28 at this point. When the motor control means 28 receives the motor stop signal, the power supply to the motor 15 is stopped at this point, whereby the brake 30 is activated and the rotation of the output shaft, that is, the rotation of the disk 20 is stopped. The time from when the position detector 23 sends the position detection signal by the action of the detection plate 22 to when the power supply to the motor 15 is stopped is extremely short because these processes are performed by the electric signal, The moving length of the moving frame 2 after the detector sends the position detection signal is in a negligible range. Therefore, when the detection plate 22 of the disk 20 acts on the position detector 23 after a preset time has elapsed, the moving frame 2 can be stopped at a predetermined position.

In this way, when the sieving by the shaking motion is completed and the stopping position of the sieves 6 is a predetermined position, it becomes easy to grasp the sieves 6 on the sieve receiving base 10 by the robot arm or the like. Therefore, the sieves 6 can be carried out immediately and surely.

Reference numeral 33 shown in FIG. 3 is a stop switch. When the stop switch 33 is operated, a forced stop signal is sent to the motor control means 28 to force the motor 15 regardless of whether the stop condition is satisfied. You can stop. Therefore, in an emergency etc., this stop switch 3
By pressing 3, the moving frame 2 can be stopped immediately.

Another embodiment of the control device 25 shown in FIG.
Set number storage means 35 for storing the number of shakings, counting means 36 for counting the number of reciprocating movements of the moving frame 2 upon receiving a signal from the position detector 23, and the set number storage means 3
5 is compared with the count value of the counting means 36, and when the count value reaches the set number, the comparing means 37 sends a motor stop signal to the motor control means 28, and the motor 15 is supplied with power when the start signal is received. Then, the motor 15 is started and the brake 30 is released, and a motor control means 28 and the like are constituted. A setting operation part 31 for setting the number of shakings by an external operation is connected to the setting number storage means 35.

When the start switch 32 is operated after setting the number of shakings (for example, 200 times) in the set number storage means 35 by operating the setting operation section 31, a start signal is sent to the motor control means 28, Upon receipt of the signal, the motor control means 28 supplies power to the motor 15 to start it and releases the brake 30. Therefore, the disk 20 of the shaking mechanism can start rotating to move the moving frame 2 from the predetermined position to the left and right linear movements in the drawing.

When the disc 20 rotates, every time the detection plate 22 passes over the position detector 23, a detection signal is sent from the detector 23 to the counting means 36 for counting, and this count value is sent to the comparing means 37. The set number of times is compared with the set number of times (for example, 200 times) stored in the set number of times storage means 35. When the count value does not reach the set number of times, the motor stop signal is not sent from the comparison means 37, so the motor control means 28 continues the operation of the motor 15. Therefore, each time the disk 20 makes one rotation, the moving frame 2 makes a reciprocating linear motion once, and while the disk 20 keeps rotating, the moving frame 2 keeps making a reciprocating linear motion.

Then, the counting means 36 counts up the position detection signal from the position detector 23, and when the count value reaches a preset number (for example, 200 times), the comparison means 37 outputs a motor stop signal at this point. Is the motor control means 2
8 is sent. When the motor control means 28 receives the motor stop signal, the power supply to the motor 15 is stopped at this point,
As a result, the brake 30 operates to stop the rotation of the output shaft, that is, the rotation of the disk 20. The time from when the detector 23 sends the position detection signal by the action of the detection plate 22 until the power supply to the motor 15 is stopped is extremely short because these processes are performed by the electric signal, and the detection is performed. The length that the moving frame 2 moves after the container sends the position detection signal is in a negligible range. Therefore, when the moving frame 2 repeats reciprocating movement a preset number of times and the detection plate 22 of the disk 20 acts on the detector 23 in this last reciprocating movement, the moving frame 2 can be stopped at a predetermined position.

In this way, when the sieving by the shaking motion is completed and the stopping position of the sieves 6 is a predetermined position, the robot arms or the like can easily grasp the sieves 6 on the pedestal,
Therefore, the sieves 6 can be carried out immediately and surely. Incidentally, reference numeral 33 in the drawing denotes a stop switch, and when it is operated during the sieving work, a stop signal is sent to the motor control means 28, and the operation of the motor 15 is stopped by the stop signal regardless of the establishment of the stop condition. .

FIG. 5 is a front view of a low-tap type multistage sieving apparatus 1 ', and FIG. 6 is a plan view of this sieving apparatus 1'.

In this sieving apparatus 1 ', two columns 40 are erected on the base 4 so as to face each other, and a boss portion is provided at the upper end of each column 40. A drive shaft 41 extending upward through the boss is rotatably mounted, and a driven shaft 42 is also rotatably mounted on the other column 40 in the same manner. An eccentric block 43 is fixed as an eccentric means, and the upper ends of the drive shaft 41 and the driven shaft 42 are attached to the bearing 4 of the upper plate 44.
It is supported by 5. Then, the boss portion of the upper arm 46 is fitted around the outer periphery of the eccentric block 43 above the drive shaft 41 and the driven shaft 42, and the boss portion of the lower arm 47 is fitted around the outer periphery of the lower eccentric block 43. The eccentric block 43 of the drive shaft 41 and the eccentric block 4 of the driven shaft 42
3 is aligned with the same phase.

In this embodiment, in order to move the stacked sieves 6 up and down, a pair of male screw shafts 49 are vertically erected from a bearing 48 provided on the lower arm 47 and a bearing 50 provided on the upper arm 46 at the upper portion. The upper plate 44 is rotatably supported and its upper end is supported by a bearing 51 provided on the upper plate 44.
The output shaft of the ascending / descending motor 52 and the upper part of the male screw shaft 49 on one side are connected via a sprocket and a chain, and the lower parts of both male screw shafts 49 are connected via a sprocket and a chain. Is driven so that both male screw shafts 49 rotate in synchronization with each other. The male screw shaft 49 and the female screw portion 53 of the sieve holder 10 are attached to the male screw shaft 49.
Screw together.

Therefore, the receiver 12 is first placed on the sieve receiver 10 with the sieve receiver 10 lowered, the sieves 6 ... Are stacked on the receiver 12 in order from the smallest mesh, and the elevator 12 is moved up and down in this state. When the male motor shaft 52 is operated to rotate the male screw shafts 49 in the forward direction, the sieve holder 10 is raised together with the sieves 6 by the action of the female screw portions 53 screwed onto the male screw shafts 49, and the uppermost sieve 6 is held. Is applied to the ascending limit detector 13, the lifting motor 5
2 stops and maintains this elevated state. Therefore, regardless of the number of sieves 6 ... Stacked on the sieve holder 10, the sieve holder 10
The height of the uppermost sieve 6 can be adjusted by rotating the both male screw shafts 49 to move the uppermost sieve 6 to the hammer 14 ′ of the hammer mechanism 14.
Can be adjusted to the height of. In addition, reference numeral 54 in the drawing denotes a strut of the hammer mechanism 14 erected from the base 4, and a hammer 14 ′ extends substantially horizontally above the sieve support 10 from the upper end of the strut 54 to hammer the uppermost sieve 6 into a hammer. 14 '
It is configured so that it can be struck by.

Further, when the lowering limit detector 55 is arranged near the lower part of the one male screw shaft 49 and the lifting motor 52 is rotated in the reverse direction to lower the sieve receiving base 10, the sieve receiving base 10 is lowered. When it acts on the detector 55, the operation of the lifting motor 52 stops,
The sieve support base 10 is configured to stop at a predetermined lower position.

A robot arm or the like may be used to stack the sieves 6 ... Further, when it is not necessary to move the stacked sieves 6 ...
It is not necessary to provide the male screw shaft 49 integrally with the above.

The above-mentioned base 4 also functions as a decelerator box which constitutes a part of the drive mechanism. For example, the base 4 is provided with a decelerator having a worm gear structure, and the shaft of the worm gear on the input side is provided with the brake motor 15. Of the drive shaft 41 is connected to the output shaft of the drive shaft 41 via a coupling 56, and the worm wheel on the output side is connected to the lower end of the drive shaft 41.
The brake motor 15 constitutes a part of the drive mechanism, and is attached to one end of the base 4 in this embodiment.
The speed reduction ratio of the speed reducer is preferably set to an integer ratio such as 6: 1.

Further, the drive mechanism is provided with a detection mechanism for electrically detecting rotation. In the present embodiment, this detection mechanism is provided on the outer periphery of the coupling 56 as an action portion, and the detection plate 2 is used.
2 is fixed, and a reed switch that detects the passage of the detection plate 22 and sends a signal is used as a position detector 23 for the base 4
Fixed on top. Therefore, when the coupling 56 rotates to rotate the sieve holder 10 in the horizontal direction, the detection plate 2
Each time 2 passes over the reed switch 23, it acts so that the reed switch 23 sends out a signal.

In the present embodiment, the rotation of the motor with brake 15 is reduced to 1/6 by the decelerator to drive the drive shaft 41 in rotation. In other words, the drive shaft 41 is rotated six times by the coupling 56. Since the eccentric block 43 makes one rotation and the sieve holder 10 makes one rotation, the position detector 23 sends a signal six times, and the sieve holder 10 is rotated once.
Will be in the same position. Therefore, if this position is set as the predetermined position, the signal from the position detector 23 is counted, and the motor 15 is stopped at the time point when “6” is reached, the sieve holder 10 can be stopped at the predetermined position. In short, in order to detect the rotation on the input side of the decelerator that is different from the rotation speed of the drive shaft 41 and stop the sieve support base 10 at a predetermined position, the detection signals are counted and the speed reduction ratio of the decelerator is used. The motor 15 may be stopped when the number of signals is reached.

In the same manner as in the above-mentioned embodiment, when measuring the particle size of the powder or granular material, a predetermined time or a predetermined number of times is set, and the sieves 6 ... Alternatively, when the number of times is reached, the shaking motion is stopped. Therefore, if the above-described predetermined time or number of times is set as a stop condition in the control device, the shaking motion is ended when the stop condition is satisfied, and the sieves 6 ... Can be stopped at a predetermined position. .

The control device 25 shown in FIG.
Set time storage means 27 mainly composed of a position detector 23
Has a counter 57 for counting the signal from the counter according to the reduction ratio of the decelerator, and when the count-up signal from the counter is received after receiving the time-up signal from the set time storage means 27, the motor control means 28 stops the motor. A stop timing control means 29 for sending a signal, and a start signal for supplying a power to the motor 15 to start the motor 15 and release the brake 30, and at the same time send a clocking start signal to the timer 26 of the set time storage means 27. A setting operation section 31 for setting the shaking time by an external operation is connected to the set time storage means 27.

When the shaking time is set in the set time storage means 27 by operating the setting operation section 31 and then the start switch 32 is operated, a start signal is sent to the motor control means 28, and the motor receiving this signal is started. Control means 2
8 supplies electric power to the motor 15 to start the brake 15
Is released, and at the same time, a clock start signal is sent to the set time storage means 27. Therefore, the eccentric block 43 can start rotating to rotate the sieve support base 10. Further, the set time storage means 27 starts measuring time when receiving the measuring start signal.

When the motor 15 operates and the coupling 56 rotates, a detection signal is sent from the position detector 23 to the stop timing control means 29 every time the detection plate 22 passes over the position detector 23, but the stop signal is stopped. Timing control means 29
Does not send the motor stop signal until it receives the time-up signal from the set time storage means 27. Therefore, every time the coupling 56 rotates 10 times, the sieve holder 10 moves the sieve 6 ...
With this, a shaking motion is performed once, and while the coupling 56 continues to rotate, the sieve support 10 and the screens 6 ... Continue the shaking motion.

When a time-up signal is sent from the set-time storage means 27 to the stop-timing control means 29 after a preset time has elapsed, the stop-timing control means 29 then drives the motor at the time when the count-up has reached 6 counts. A stop signal is sent to the motor control means 28. When the motor control means 28 receives the motor stop signal, the power supply to the motor 15 is stopped at this point, whereby the brake 30 is activated and the rotation of the coupling 56, that is, the rotation of the drive shaft 41 is stopped. The time from when the position detector 23 sends the position detection signal by the action of the detection plate 22 to when the power supply to the motor 15 is stopped is extremely short because these processes are performed by the electric signal, Moreover, the motor 15
Since the rotation of No. 2 is decelerated and transmitted by the speed reducer, the length that the sieves 6 move after the position detector 23 sends out the position detection signal is in a negligible range. Therefore, after the preset time has elapsed, the coupling 56
When the detection plate 22 of the screen acts on the position detector 23, the sieve support 1
0 and the sieve 6 can be stopped at predetermined positions.

In this way, when the sieving by the shaking motion is completed and the stopping position of the sieves 6 is a predetermined position, the robot arms or the like can easily grasp the sieves 6 on the pedestal,
Therefore, the sieves 6 can be carried out immediately and surely.

The control device for setting the number of shakings as the stop condition may have the same configuration as that of the control device 25 shown in FIG. 4, but depending on the speed reduction ratio of the speed reducer, for example, in the case of the above embodiment. Since the reduction ratio is 10: 1, the comparison means 37 calculates the count value of the counting means 36 to 1/10 and compares it with the number of times stored in the set number storage means 35 or stores the set number of times. The number of times of storage of the means 35 may be multiplied by 6 for comparison, or a motor stop signal may be sent to the motor control means 28 when the count value reaches the number of times of storage.

A detection mechanism is provided on the output side of the decelerator, such as a worm wheel, which rotates at the same speed as the drive shaft 41, or the decelerator-equipped motor 15 is used as a drive source. In the case of transmitting the output to the drive shaft 41 without decelerating, if the motor 15 is stopped at the time when the position detection signal is sent from the detector, the sieve holder 10 can be stopped at a predetermined position. In such a case, the control device 25 of the first embodiment shown in FIG. 3 can be used as it is to stop the sieves 6 ...

The eccentric means is not limited to the eccentric block 43 or the eccentric cam, but may be a crank mechanism.

[0052]

As described above, according to the present invention, in claim 1, the rotation of the rotating portion of the motion converting portion is electrically detected by the detection mechanism, and when the preset stop condition is satisfied, the detection mechanism detects the rotation. Since the drive source is stopped based on the detection signal of, the moving frame can be stopped at the same position every time when the shaking motion is completed. Therefore, if this position is set as the predetermined position, when the sieve is carried out by a carry-out machine such as a robot arm, the carry-out machine and the sieve can be easily aligned with each other, and the sieve can be reliably gripped. Further, since the step of moving the sieve to the predetermined position again after the shaking motion is finished is unnecessary, it is possible to immediately shift to the unloading step of the sieve if the sieve is stopped, eliminating wasteful time, Work efficiency can be improved.

Further, in the present invention, the rotation of the drive mechanism is electrically detected by the detection mechanism, and when the preset stop condition is satisfied, the drive shaft is stopped based on the signal from the detection mechanism to move the sieve holder. Since the shaking motion is stopped, this sieve support can be stopped at the same position every time. Therefore, if this position is set as the predetermined position, when the sieve is carried out by a carry-out machine such as a robot arm, the carry-out machine and the sieve can be easily aligned with each other, and the sieve can be reliably gripped. Further, since the step of moving the sieve to the predetermined position again after the shaking motion is finished is unnecessary, it is possible to immediately shift to the unloading step of the sieve if the sieve is stopped, eliminating wasteful time, Work efficiency can be improved.

According to the third aspect of the present invention, since the sieve holder can be moved up and down, regardless of the number of sieves stacked on the sieve holder, only by adjusting the height of the sieve holder, the uppermost sieve can be moved to the hammer mechanism. Can be adjusted to the height of the hammer. Therefore, it is not necessary to stack sieves that are not directly used for sieving as spacers, and the work can be rationalized.

[Brief description of drawings]

FIG. 1 is a front view of a moving table type multistage sieving apparatus.

FIG. 2 is a plan view of the movable table type multistage sieving apparatus shown in FIG.

FIG. 3 is a schematic block diagram of a control device that sets a shaking time as a stop condition.

FIG. 4 is a schematic block diagram of a control device that sets the number of shakings as a stop condition.

FIG. 5 is a front view of a low-tap type multistage sieving device.

FIG. 6 is a plan view of the low-tap type multistage sieving apparatus shown in FIG.

FIG. 7 is a schematic block diagram of another embodiment of the control device.

[Explanation of symbols]

 1 Mobile stage type multi-stage sieving device 1'Low-tap type multi-stage sieving device 2 Moving frame 3 Wheels 4 Base 5 Rail 6 Sieve 8 Fixing cylinder 9 Fixing plate 10 Sieve receiving stand 11 Lifting cylinder 12 Receiver 14 Hammer Mechanism 15 Motor with Brake 16 Rotating Shaft Section 17 Connecting Rod 19 Amplitude Adjusting Plate 20 Disk 21 Long Groove 22 Detecting Plate as an Actuating Section of Detecting Mechanism 23 Position Detector of Detecting Mechanism 25 Control Device 26 Timer 27 Set Time Storage Means 28 Motor control means 29 Stop timing control means 30 Brake 31 Setting operation part 32 Start switch 33 Stop switch 35 Setting frequency storage means 36 Counting means 37 Comparing means 40 Strut 41 Drive shaft 42 Driven shaft 43 Eccentric block 46 Upper arm 47 Lower arm 49 Male Screw shaft 5 2 Lifting motor 56 Coupling

Claims (3)

[Claims] 1. A moving frame which is movable on a base via wheels, a speed reducing unit for speeding down the rotation of a drive source, and a rotation output of the speed reducing unit in a reciprocating motion of one reciprocation per one rotation. It has a motion converting part for converting and a transmitting part for transmitting the reciprocating motion converted by the motion converting part to the moving frame, and a shaking mechanism for vibrating the moving frame, and moving a sieve placed on the moving frame. A sieve clamp mechanism that clamps the frame at a predetermined position with respect to the frame, a detection mechanism that electrically detects the rotation of the rotating portion of the motion conversion unit, and a detection mechanism that detects that a preset stop condition is established by an external operation. A multi-stage sieving device for powder and granules, comprising: a control device that stops a drive source based on a signal. 2. A vertical drive shaft provided along one of a pair of support columns standing upright on the base, a vertical driven shaft provided along the other support column, and upper and lower portions of these shafts. Eccentric means fixed to the upper eccentric means, an upper arm fitted to the upper eccentric means, a lower arm fitted to the lower eccentric means, a screen pedestal that moves horizontally with the lower arm, and a rotation of the drive source. A drive mechanism that rotationally drives the drive shaft by force, a detection mechanism that electrically detects the rotation of the drive mechanism, and a drive source based on a detection signal from the detection mechanism when a preset stop condition is established by an external operation. A multi-stage sieving device for powder and granules, which is equipped with a control device for stopping. 3. A hammer mechanism for guiding the sieve support base by a shaft provided upright from a lower arm so that the sieve support base can be moved up and down, and a hammer mechanism for tapping a sieve placed on the sieve support base is provided. A multi-stage sieving apparatus for the described powder and granules.