JPS6150852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for quantitatively feeding powder and granules in which a vessel containing powder and granules such as coarse aggregate, sand, and cement is tilted and a constant amount of powder and granules are always fed from a discharge port. This relates to a feeding device.

The present applicant rotatably provides a metering rotating feeder that always feeds a fixed amount of powder or granules from the vessel at the discharge port of the vessel, and also installs a fixed amount of powder or granules at the upstream side of the metering rotary feeder. We have already proposed a powder quantitative feeding device in which a conveyor for conveying to a rotary feeder is rotatably provided and these are connected to the same drive source, but in that case, the powder is not caught in the conveyor. If a blockage occurs, when the conveyor is reversed to clear the blockage, the metering rotary feeder will also be reversed, so when the conveyor and metering rotary feeder are then rotated forward, a sufficient amount of powder and granules will be delivered to the latter than the former. There was a problem in that the amount of powder and granular material fed from the quantitative rotary feeder fluctuated and was not constant until it was transported.

Therefore, in the present invention, when the conveyance car is clogged with powder or granules, the conveyance car is reversed and the rotation of the metering rotary feeder is stopped during that time, so that a fixed amount of the metering rotary feeder is always delivered. It is an object of the present invention to provide a powder and granular material quantitative feeding device capable of feeding granular material.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. On the main frame 1 of the vehicle V, a box-shaped vessel 3 is mounted on a subframe 2 and can be tilted rearward around a pivot shaft 4 by a lift cylinder 5. It is equipped as follows. The intermediate portions of the left and right side walls of the Bethel 3 are each inclined inward. At the center of Bethel 3, a vertical partition wall 7 is erected on its longitudinal axis, and this vertical partition wall 7
Its front end is fixed to the front wall of the Bethel 3, and its rear end is fixed to the horizontal partition wall 8 which is erected across the rear of the Bethel 3 at its upper part, and its lower part is attached to the left and right loading ports, which will be described later. It is connected to the side walls defining channels 12,13. The inside of the Bethel 3 is divided into 3 parts by the vertical partition wall 7 and the horizontal partition wall 8.
three chambers, namely left ventricle A, right ventricle B and posterior ventricle C
In this embodiment, the left chamber A stores coarse aggregate (gravel), the right chamber B stores sand, and the rear chamber C stores cement. At the upper front of each carry-in path 12, 13, there are provided walls 8a, 8b in the left-right direction, which are open at the bottom. Further, the upper surfaces of the left and right chambers A and B are open, and the upper surface of the rear chamber C is covered with a lid 11 having a manhole 10.

The floor plate 6 of the sand storage chamber B is inclined forward upward by about 5 degrees from the base end toward the tip in the direction in which the vessel 3 is tilted. A lightening plate 6a is installed.

Further, in the left ventricle A, projecting walls 9, 9, . . . are fixedly provided in a direction substantially perpendicular to the floor surface 6'. A space is formed below the partition wall 9 with an appropriate distance from the floor surface 6' of the left ventricle A, and extends upward to near the upper edge of the vessel 3. Thus, the left ventricle A is divided into chambers A ₁ , A ₂ , A ₃ . . . as shown in the figure.

Immediately below the rear chamber C, left and right entry paths 12 and 13 are provided symmetrically to the left and right along the longitudinal direction of the vessel 3. In addition, as shown in the diagram, the loading path 1
The floor 6'' of No. 2 is constructed lower than the floor 6 of the loading path 13. These left and right loading paths 12, 13 are connected to the left,
A conveyance mixing device 20 for the right ventricles A and B, respectively, which will be described later.
communicate with. A first transport feeder 16 is rotatably supported within the left carry-in path 12, and is connected to a hydraulic motor 19 and driven to rotate forcibly. On the other hand, in the right carry-in path 13, there is a second conveyance feeder 1 at almost the same front and back position as the first forward-packing conveyance feeder 16.
7 is rotatably supported, which is connected to a hydraulic motor 18.
It is coupled to and forced to rotate. In addition, the second
A stirring device, that is, a stirring wheel 15 is rotatably supported in front of the conveyance feeder 17.
5 is connected to the hydraulic motor 18 via a known transmission means.
It is connected to and forced to rotate.

14 is a roller rotatably supported within the left carry-in path 12 and in front of the first conveyance feeder 16. The outer periphery of the roller 14 is made of an elastic material such as rubber. Furthermore, the roller 14 is a sliding body 1 housed in a space below the floor 6' so as to be movable in the front and rear direction.
4a. Adjustment of the longitudinal position of the sliding body 14a is performed, for example, by a known screw means 14b. By adjusting the longitudinal position, the roller 14
The gap between the first transport feeder 16 and the outer periphery of the first transport feeder 16 can be adjusted.

Further, each blade of the first conveyance feeder 16 is inclined forward in the traveling direction with respect to the radial direction (i.e., has a rake angle) as shown in the figure, and furthermore, its outer edge is also inclined with respect to the rotational axis direction. The blades are formed into a spiral. By doing so, it is possible to equalize the load applied to the blades of the first conveyance feeder 16 by the coarse aggregate, and also to eliminate the clogging phenomenon caused by the coarse aggregate.

Further, in the lower part of the rear chamber C, a conveying stirring device, that is, left and right conveying cars 22a, 22b and a central stirring wheel 22c are configured on a common shaft and are rotatably suspended horizontally, and further below this stirring wheel 22c. A quantitative feeding device, that is, a quantitative rotary feeder 23 is rotatably horizontally mounted at the rear, and a discharge side opening 23a of the quantitative rotary feeder 23 is opened at the lower part of the rear wall of the vessel 3, and a flexible chute 19' extended by. As shown in an enlarged view in _FIG .
G ₂ is connected to a hydraulic motor 25 so that it can be driven in forward and reverse rotation, and the quantitative rotary feeder 23 is also connected to this hydraulic motor 25 via gears G ₁ , G ₂ , G ₃ and a known one-way clutch CL. When these are rotated, the cement in the rear chamber C is transferred to the chamber C by the left and right conveyors 22a and 22b. The stirring wheel 22c is moved to the center part.
Then, while being stirred by the metering rotary feeder 23, it is sent to a kneading device 36, which will be described later, via the discharge side opening 23a of the metering rotary feeder 23 and the chute 19' connected thereto.

Furthermore, the elastic body 17 is also attached to the quantitative rotary feeder 23.
According to b, an elastic body 23b is provided.

At the lower rear end of the vessel 3, a conveyance mixing device 20 is provided along the rear wall, and the device 20 is provided with left and right conveyance chambers 31 and 32 separately on the left and right sides, respectively.
The transfer chambers 31 and 32 both have a cylindrical shape. The transfer chamber 31 is in contact with the floor 6'' of the carry-in passage 12 and extends from the left end of the carry-in passage 12 to almost the center of the vessel 3, and the front thereof is cut out and communicates with the rear opening of the carry-in passage 12. The right end of the chamber 31 has a central mixing port 3 at the rear.
Open 1a. Further, a left screw conveyor 28 is housed and supported in the transfer chamber 31, and a hydraulic motor 26 is connected thereto, thereby forming a left transfer machine. On the other hand, the transfer chamber 32 is provided in contact with the floor 6 of the carry-in path 13 and slightly forward of the transfer chamber 31, and further extends from the right end of the carry-in path 13 to approximately halfway between the left and right ends of the transfer chamber 31. The front part of the concavity in contact with the carry-in passage 13 is cut out, and communicates with the rear opening of the carry-in passage 13. The left end of the transfer chamber 32 is open as a transfer end 32a. The right screw conveyor 29 is accommodated and supported in the transfer chamber 32 thus formed, and a hydraulic motor 27 is connected thereto, thereby forming a right transfer machine.

Next, the kneading device 36 disposed behind the conveying and mixing device 20 will be explained. A bracket 35 is provided at the rear of the vessel 3, and a kneading container 37 is pivotably supported 38 so as to be able to rise and fall freely. This shaft 38 is the pivot shaft 4
In contrast, when the vessel 3 is horizontal (the state shown by the solid line in FIG. 1), it is positioned forward and upward. More precisely, when the vessel 3 is tilted (the state shown by the chain line in FIG. 1), the shaft 38 is set so that it is almost at the top of its rotation. A wire locking piece 24a is provided on the container 37 to project sideways, and one end of the wire locking piece 24a is locked to the wire locking piece 24a.
Bracket 24b provided on the rear wall of Bethel 3
A wire 24f is wound around a hydraulically driven winch 24e provided on the same axis as the pivot shaft 4 via a free rotation pulley 24d which is supported by a shaft 24c.
Thus, with the above configuration from 24a to 24f,
Rotating means for the kneading device 36 is configured.

Inside the kneading container 37, there are a mixing wheel _S1 and a mixing wheel _S2.
-S5 are rotatably provided, and these mixing wheels and kneading wheels are synchronously driven in the same direction (clockwise) by hydraulic motors 41 and 42. 37b and 37c are an inlet and an outlet of the kneading container 37.

In front of the Bethel 3, a water tank 57 and a hydraulically driven water pump 58 for pumping the stored water into the water tank 57 are provided on the frame of the vehicle. The water supply pipe 60 extends to the rear of the vehicle V, and its open free end opens into the kneading container 37.

In addition, 61 in the figure is an outrigger provided on the main frame 1 of the vehicle V.

Next, to explain the case where the vehicle V loaded with concrete materials mixes and generates ready-mixed concrete at a construction site, etc., as described above, the vehicle V
After stopping, the outriggers 61 are first extended to support the frame 1, and then the lift cylinders 5 are extended and the vessel 3 is tilted rearward around the pivot shaft 4 as shown by the chain line in FIG.

In this case, the winch 24e is activated and the wire 2
4f, the kneading device 36 tilts around the shaft 38 due to its own weight and is held in a slightly downward position at the rear, as shown by the chain line in FIG.

Left and right ventricles A and B due to the backward tilt of Bethel 3 mentioned above.
The coarse aggregate and sand inside move to the rear of the vessel 3 due to their own weight and enter the left and right carry-in paths 12 and 13 located at the lower rear of the vessel 3. Here right ventricle B
stirring wheel 15 and first and second conveyance feeders 1
When both 6 and 17 are rotated in the direction shown in the figure, the sand stored in the right chamber B is first stirred and loosened by the stirring wheel 15, and then weighed by the second conveyance feeder 17, and then transported to the right from the rear end of the right carry-in passage 13. It is sent into the transfer chamber 32. At the same time, the coarse aggregate stored in the left chamber A is weighed by the first transport feeder 16 and sent into the left transport chamber 31 from the rear end of the left transport path 12. The coarse aggregate and sand carried into the left and right transfer chambers 31 and 32 from the left and right carry-in paths 12 and 13 in this way are carried by left and right screw conveyors 28 and 29 rotating in the direction shown in the figure. gradually moved towards the center. By the way, when Bethel 3 is tilted, the first
As can be understood from the figure, since the conveyor 29 is located above the conveyor 28, the sand conveyed by the conveyor 29 falls from the conveying end 32a onto the gravel being conveyed by the conveyor 28. The gravel and sand are mixed and further transferred by the conveyor 28, and fall into the carry-in port 37b from the transfer port 31a opened above the carry-in port 37b of the kneading device 36.

Meanwhile, at the same time, the transport vehicle 22 is also inside the rear chamber C.
a, 22b, the stirring wheel 22c, and the rotation of the metering rotary feeder 23 in the directions shown in the figure, the cement at the inner bottom of the rear chamber C is transported to the center, stirred, and weighed by the metering rotary feeder 23 to the opening 23a.
Then, it is dropped into the front entrance 37b of the kneading device 36 via the chute 19'. At this time, if the conveyance cars 22a, 22b and the stirring wheel 22c are clogged with cement, the hydraulic motor 25 is reversed and the conveyance cars 22a, 22b and the stirring wheel 22c are driven in the reverse direction to clear the blockage, but the quantitative rotary feeder 23 The rotation is stopped without being reversed by the operation of the one-way clutch CL, and after the blockage is cleared, the hydraulic motor 25 rotates in the normal direction again, and the transport vehicles 22a, 22b, stirring wheel 22c, and quantitative rotary feeder 23 start rotating in the normal direction again. do.

Note that as the second transport feeder 17 and quantitative rotary feeder 23 rotate in the arrow directions shown in the figure, the free ends of the elastic bodies 17b and 23b are repelled by the blades of the second transport feeder 17 and quantitative rotary feeder 23. Since the sand and cement in the valleys between the blades are pounded, accurate measurement can be expected without sand or cement sticking to these valleys.

A mixture of coarse aggregate, sand, and separate cement for producing fresh concrete as described above are carried into the mixing container 37, and a pump 58 is driven to supply pressurized water from a water tank 57 through a water supply pipe 60. is supplied, so that the cement does not solidify due to moisture in the aggregate during transportation.

At this time, the container 37 is tilted downward to the right as shown by the chain line in FIG. Therefore, the above-mentioned aggregate mixture and cement are gradually conveyed mainly by their own weight toward the outlet 37c, but in the meantime, they are first scraped and mixed by the mixing truck _S1 , and then the mixture is further conveyed from the water supply pipe 60. Water supply is also added to mixer vehicle S ₂
-Sequentially kneaded by _S5 .

If the sufficiently kneaded mixture is filled above the lower end level of the carry-out port 37c, the carry-in port 37c
The amount carried in from b is carried out from the outlet 37c.

During the operation, the height of the outlet 37c from the ground is increased due to the rise of the container 37 due to the rise of the shaft 38. Therefore, by connecting a chute (not shown) to the outlet 37c, it is possible to move the outlet 37c as far as possible. The mixture can be transferred to

The discharge capacity of the coarse aggregate, sand, cement, etc. can be arbitrarily determined by adjusting the rotational speed of each motor 19, 18, and 25 by a control means (not shown).

Further, after discharging the kneaded material, the lift cylinder 5
As a result of the contraction, the vessel 3 is laid down on the frame of the vehicle V, the wire 24f is operated to retract, the kneading container 37 is rotated upward and retracted, and the vehicle is returned to the running position.

According to the present invention, the coarse aggregate mixing and measuring roller 14 and the first conveyance feeder 16 are driven by a hydraulic motor 19, the conveyance vehicles 22a and 22b and the stirring wheel 2 are driven by a hydraulic motor 25.
2c, rotating members such as left and right screw conveyors 28, 29 driven by hydraulic motors 26, 27, mixing wheel _S1 and kneading wheels _S2 to _S5 driven by hydraulic motors 41, 42 are coarse aggregates. When an excessive load is applied to the hydraulic motors 19, 25 to 27, 41, and 42 that drive the motors 19, 25 to 27, 41, and 42, which are subjected to large resistance due to entrapment of sand, cement, etc., the hydraulic circuit H and the electric control circuit E, which will be described later, As a result of the operation, a specific hydraulic motor that is in an overload state is reversed, and the rotating member that has caught coarse aggregate is reversed to eliminate the coarse aggregate jammed state, and the operation of other hydraulic motors is stopped. After a certain period of time has elapsed, the entire hydraulic motors 18, 19, 25-27, 41, 42 are again driven to rotate in the forward rotation direction.

Next, the hydraulic circuit H of the present invention device will be explained with reference to FIG. 6. 100 is a hydraulic pump driven by an engine 101;
The hydraulic oil pressurized by 0 is discharged oil passage 102,
The oil is supplied to the hydraulic motor group M, the lift cylinder 5, and the hydraulic drive winch 24e via the switching valve group _V0 , is returned to the oil sump 104 via the return oil path 103, and flows through the discharge oil path 102. Excessive high pressure oil passes through the relief valve 105 and returns to the return oil path 1.
03.

The switching valve group V ₀ is composed of electromagnetic switching valves V ₁ to V ₂ and manual switching valves V ₇ and V ₈ , among which the electromagnetic switching valves V ₁ to V ₆ are connected to a water pump 58 and a stirring wheel 1 .
Hydraulic motors 58' and 18, which respectively drive the motors 58' and 17, are switched in two directions by solenoids SOL ₀ to SOL ₁ to drive them in normal rotation and to stop their operation, respectively, and the electromagnetic switching valves V ₃ to V ₆ Transport vehicles 22a, 22b, stirring wheel 22c, first transport feeder 16, constant rotation feeder 23, left and right screw conveyors 28, 29, and kneading device 3
Solenoids _SOL2 , SOL3, and SOL are used to rotate the hydraulic motors 25, 19, 26, 27, 41, and 42, which rotationally drive the mixing wheel _S1 and kneading wheels S2 to _S5 of _{No. 6} , in forward, reverse, and stop, _respectively . ₄ , ₅ , SOL ₆ , ₇ , and SOL ₈ , ₉ , and the manual switching valves _V7 and _V8 telescopically control the hydraulically driven winch 24e of the kneading device 36 and the tilting lift cylinder 5 of the Vessel 3. I'm starting to do that.

stirring and conveying the sand, cement and coarse aggregate;
Each oil passage connecting the metering hydraulic motors 18, 25, 19 and the electromagnetic switching valves V ₂ to V ₄ for controlling their operation controls the amount of hydraulic oil flowing therethrough to control the amount of concrete materials supplied. Regulating flow control valve
V ₂₁ to _{V 41} are respectively installed, and the hydraulic motor 2
5, 19, 26, 27, 41, 42 and solenoid switching valve
The oil passages connecting V ₃ to V ₆ are respectively provided with pressure switches PS ₁ to PS ₄ , which are activated when the pressure of the hydraulic oil flowing therein drops to a certain level or higher.

In FIG. 6, reference numeral F designates a filter for the hydraulic oil flowing through the hydraulic circuit H.

FIG. 7 shows a typical example of an electric control circuit E for switching and controlling the electromagnetic switching valves _V1 to _V6 , and the configuration thereof will be explained below. The control electric circuit shown in this figure is an automatic and manual control circuit that automatically and manually controls the energization state of the solenoids SOL ₀ to _{SOL 9} that switch and operate the solenoid switching valves V ₁ to V ₆ . ₁ and connected in parallel to the power supply ES so that they can be switched to each other via the power supply ES. First, let me explain the configuration of the automatic control circuit.
Stop circuit SC, hydraulic motor 18, 19, 25-2
Solenoids SOL ₀ to SOL ₂ , SOL ₄ , SOL ₆ , SOL ₈ are connected so that 7, 41, 42, and 58' are driven in normal rotation.
a normal rotation circuit NC that controls the operation of the hydraulic motors 19, 25 to 27, 41, and 42; Feedback circuit that stops the operation of the switching circuit NG
FC, a delay circuit DC that activates the normal rotation circuit NC after a certain period of time has elapsed since the activation of the start/stop circuit SC, and a hydraulic motor 19, 25 to 27, 41, which is activated by the oil pressure detection circuit PDC. 4
2 fighting solenoid SOL ₃ , SOL ₅ ,
The reversing circuit RC that controls the operation of SOL ₇ and SOL ₉ is connected to the power supply ES in parallel with each other via the changeover switch TS ₁ and the main switch MS as shown in the figure, and the solenoids SOL ₀ to SOL ₉ are connected to the relay switch γ _12. ~γ ₁₄ , limit switches LS ₄ to LS ₆ , and the start/stop circuit SC connected to the power supply ES as shown in the figure via a diode.
is a normally open pressure switch PS ₀ operated by the water pressure of the water pump 58, a normally open start button switch PB ₁ , a relay R ₀ , and a normally open switch that is closed by the operation of the relay R ₀ . Type relay switch γ
₀₁ , a normally closed stop button switch _PB2 , and a pilot lamp PL are connected as shown in the figure, and the normal rotation circuit NC is a normally open type that is closed by the operation of the relay _R0 . Relay switch γ
₀₁ , a normally open timer relay switch that is closed by timer relay TR ₂ of delay circuit DC, which will be described later.
tr ₂₁ , relay that operates relay switches r ₁₁ to r ₁₄
R ₁ , relay switch r ₁₁ , feedback circuit FC
The hydraulic pressure detection circuit PDC is configured by connecting a relay switch r ₆₁ which is opened by the operation of the relay R ₆ and a timer relay TR ₁ as shown in the figure, and the hydraulic pressure detection circuit PDC is a normal switch which is closed by the operation of the timer relay TR ₁ . Open type timer relay switch TR ₁₁ , relay R ₂ ~ _{R 5}
is a normally open pressure switch PS ₁ ~ that is closed when the oil pressure in the return oil path connected to the hydraulic motors 19, 25 ~ 27, 41, 42 drops to a certain value or more.
PS ₄ , diodes D ₁ , D ₃ , D ₅ , D ₇ , and limit switches LS ₀ to LS ₃ are connected in parallel to each other as shown, and the relays R ₂ to _{R 5}
is a normally open type relay switch that is closed by the operation of the limit switches _LS0 to _LS3 , the diodes _D2 , _D4 , _D6 , _D8 , and the relays _R2 to _R5 .
r ₂₁ , r ₃₁ , r ₄₁ , r ₅₁ to a normally closed timer relay switch TR ₂₂ operated by a timer relay TR ₂ of a delay circuit DC. _The feedback circuit FC includes normally open relay switches _{r22 , r32 , and}
r ₄₂ and r ₅₂ are connected in parallel to the timer relay switch tr ₂₂ and the relay R ₆ ,
The delay circuit DC is a normally closed timer relay switch that is opened by the operation of the timer relay _TR1 .
tr ₁₂ and timer relay TR ₂ are connected in series, and the reversing circuit RC is configured by connecting the above-mentioned relays R ₂ to _{R 5} in series.
Relay switch _r23 , which is closed by the operation of
r ₃₃ , r ₄₃ , and r ₅₃ are connected in parallel to the timer relay switch tr ₂₂ and solenoids SOL ₃ , SOL ₅ , SOL ₇ , and SOL ₉ for reversing the hydraulic motors 19, 25 to 27, 41, and 42. be done.

Next, to explain the operation of this electric control circuit E, first, the water pump 58 is started and the pressure switch is turned on.
When PS ₀ is closed, then master switch MS is closed, and changeover switch TS ₁ is switched to the automatic side, the pilot lamp PL is lit. At this time, when limit switches LS ₀ to LS ₆ are closed and start button switch PB ₁ is pressed, relay R ₀ is activated, relay switch r ₀₁ is closed, and the operation of relay R ₀ is self-maintained. In addition, relay switch _R02 is closed by the activation of relay _R0 , and timer relay _TR2 of the delay circuit DC is activated.
After the time set by TR ₂ has elapsed, the timer release switch tr ₂₁ of the normal rotation circuit NC is closed, and at the same time, the timer release switch tr ₂₂ of the oil pressure detection circuit PDC is opened. When timer relay switch tr ₂₁ closes, relay R ₁ and timer relay TR ₁ operate, and as relay R ₁ operates, relay switches r ₁₁ to r ₁₄
is closed, and by closing relay switch _r11 , the operation of relay _R1 and timer relay _TR1 is self-maintained, and by closing relay switches _r12 to _r14 , solenoids _SOL0 to _SOL2 , _SOL4 , SOL ₆ ,
SOL ₈ becomes energized and the electromagnetic switching valves V ₁ to V ₆ are switched to the normal rotation position, that is, the left position in FIG. 6, and the hydraulic motors 18, 19, 25 to 27, 41, 42,
8' is rotated in the normal rotation direction.

Further, when the timer relay TR ₁ is activated, the timer relay switch TR ₁₁ is closed after the time set by the timer relay TR ₁ has elapsed, and the oil pressure detection circuit is closed.
At the same time as PDC is activated, timer relay switch tr ₁₂ of delay circuit DC is opened and timer relay TR ₂ is deactivated, so timer relay switch tr ₂₁ of forward rotation circuit NC returns to the open state and oil pressure is detected. circuit pdc timer release switch tr ₂₂
also returns to the closed state, but the timer relay switch
Even if tr ₂₁ returns to the open state, the relay switch remains
Since r ₁₁ and r ₆₁ are closed, relay R ₁ and timer relay TR ₁ are kept in the activated state, and therefore relay switches r ₁₂ to _{r 14} operated by relay R ₁ are also kept in the closed state. Hydraulic motor 18, 19, 25-2
7, 41, 42, 58' forward rotation operation solenoid
_SOL0 to _SOL2 , _SOL4 , _SOL6 , and _SOL8 continue to operate. In addition, in this state, the oil pressure detection circuit PDC
Since the pressure switches PS ₁ to PS ₄ are configured as normally open, the relays R ₂ to R ₅ are in the inactive state, and therefore the relay switches R ₂₂ ,
r ₃₂ , r ₄₂ , r ₅₂ and the relay switches r ₂₃ , r ₃₃ , r ₄₃ , r ₅₃ of the reverse circuit RC are all open, and the solenoid for reverse operation of the hydraulic motors 19, 25 to 27, 41, 42 Since SOL ₃ , SOL ₅ , SOL ₇ , and SOL ₉ are inactive, the electromagnetic switching valves V ₁ to _{V 6} are held in the normal rotation position, that is, switched to the left side in FIG. 6, and the hydraulic motors 18, 19,25-27,4
1, 42, and 58' are rotationally driven in the normal rotation direction.

If coarse aggregate is caught in the coarse aggregate rollers 14 or the first transport feeder 16 and an excessive load is applied to the hydraulic motor 19 that drives them, the hydraulic pressure on the upstream side of the hydraulic motor 19 will be reduced. As the hydraulic pressure increases, the hydraulic pressure on the downstream side decreases, and the pressure switch connected to the downstream side of the hydraulic motor 19
Since PS ₂ is closed, relay R ₃ is activated and relay switches r ₃₁ to r ₃₃ are closed. Closing of relay switch r ₃₂ activates relay R ₆ , causing the forward rotation circuit.
Since NC relay switch _r61 is opened, relay _R1 and timer relay _TR1 stop operating.
Relay switch r ₁₂ ~ due to deactivation of relay R ₁
r ₁₄ returns to the open state, and the forward rotation solenoid SOL ₀ ~
Since the power to SOL ₂ , SOL ₄ , SOL ₆ , and SOL ₈ is cut off, the electromagnetic switching valves V ₁ to V ₃ , V ₅ , and V ₆ are switched to the cutoff position, that is, the neutral position shown in FIG. Motor 58', 18, 25-27, 41, 42
The operation of the relay switch R 33 is stopped and the relay switch R ₃₃
As the reversal solenoid SOL ₅ is energized by the closing of the solenoid SOL 5, the electromagnetic switching valve V ₄ is switched to the reverse position, that is, the right position in FIG.
9 is rotated in the reverse direction, and the coarse aggregate roller 14 and first conveyance feeder 16 are also driven to rotate in the reverse direction. Pressure switch PS ₂ is opened accordingly, but the relay
R ₃ is kept in the activated state by timer relay switch tr ₂₂ and relay switch r ₃₁ in the closed state.

When the timer relay TR ₁ stops operating, the timer release switch TR ₁₁ of the oil pressure detection circuit PDC immediately returns to the open state, but as mentioned above, the timer release switch TR ₂₂ , relay switch R ₃₁ , and limit switch LS ₁ are all closed. Since relay R ₃ continues to be activated, relay switches r ₃₁ to r ₃₃ activated by relay R ₃ are kept closed.

Further, as the timer relay TR ₁ stops operating, the timer relay switch tr ₁₂ of the delay circuit DC immediately returns to the closed state, so that the timer relay TR ₂
becomes activated, which causes its timer relay to
After the time set by TR ₂ has elapsed, the timer release switch of the forward rotation circuit NC and oil pressure detection circuit PDC is activated.
tr ₂₁ and tr ₂₂ are activated together. Closing of timer relay switch tr ₂₁ activates relay R ₁ and timer relay TR ₁ , which closes relay switches r ₁₁ to r ₁₄ related to relay R ₁ , and forward rotation solenoid SOL _{0 is} activated.
~ SOL ₂ , SOL ₄ , SOL ₆ , and SOL ₈ are energized, and the solenoid switching valves V ₁ ~ _{V 3} , V ₅ , and V ₆ are switched to the normal rotation position, that is, the left position in Figure 6, and the timer relay is switched to the left position in Figure 6. When the switch tr ₂₂ is opened, the reversing solenoid SOL ₅ is deenergized and the solenoid switching valve V ₄ is switched to the forward rotation position, that is, the left position in Fig. 6.
When the timer relay switch tr ₂₂ is opened, the operation of the relay R ₃ is stopped, so the related relay switches r ₃₁ to _{r 33} are returned to the open state, and accordingly, the operation of the relay R ₆ is stopped and the relay switch is turned off.
r ₆₁ also returns to the closed state.

Further, by the operation of the timer relay TR ₁ , the timer relay switch tr ₁₁ is closed after the set time has elapsed, and the timer relay switch tr ₁₂ is closed.
is opened and timer relay TR ₂ becomes inactive accordingly, so timer relay switch tr ₂₁ of the forward rotation circuit NC is opened and timer relay switch tr ₂₂ of the oil pressure detection circuit NC is closed. The entire circuit returns to normal operating condition.

If the overload is still not eliminated even after the rotation of the hydraulic motor 19 is switched from the reverse rotation direction to the forward rotation direction, the pressure switch PS ₂ is operated again and the above operation process is repeated. There is.

When the pressure switch PS ₁ , PS ₃ or PS ₄ that detects an overload condition of the hydraulic motors 25 to 27 or 41, 42 is activated, the operation is almost the same as when the pressure switch PS ₂ described above is activated. It follows the process.

Stop button switch PB ₂ of start/stop circuit SC
When it is pressed and released, relay R ₀ is deactivated, the related relay switch r ₀₁ is opened, and relay R ₀ is released from self-holding, and relay switch r ₀₂ of the forward rotation circuit NC is also opened. Since the normal rotation circuit NC and oil pressure detection circuit are connected to
The power supply to the PDC, feedback circuit FC, delay circuit DC, and reversing circuit RC is cut off, and the entire circuit stops operating.

In the above, the case where all limit switches LS ₀ to LS ₆ are closed has been explained, but these limit switches LS ₀ to LS ₆ can be opened and closed individually. For example, only limit switches LS ₂ , LS ₃ , and LS ₅ can be closed. When the condition is established, the solenoids SOL ₆ to _{SOL 9} are activated and the hydraulic motors 26, 27, 41, 42 are activated.
If the limit switches LS ₀ to _{LS 6} are all opened, the hydraulic motors 18, 19, 25 to 25 can be operated even if the master switch MS and start button switch PB ₁ are closed.
The entire operation of 27, 41, 42, 58' can be stopped.

Next, I will explain the configuration of the manual control circuit.
This is constructed by connecting the solenoids SOL ₀ to _{SOL 9} to the changeover switch TS ₁ via manual open/close switches TS ₇ and TS ₂ to TS ₆ , respectively. , first switch changeover switch TS ₁ to the manual side, and then switch open/close switch TS _2.
By manually closing ~TS ₇ individually, the corresponding SOL ₁ ~SOL ₉ and SOL ₀ can be activated, respectively.

As described above, according to the present invention, the quantitative rotary feeder 23 is provided at the discharge port of the vessel 3 that accommodates the internal powder and granules, and the conveyor 22 is provided on the upstream side thereof.
a, 22b, 22c are provided, and the conveyor 22a,
22b and 22c are connected to a drive source 25 so as to be able to rotate forward and backward, and the quantitative rotary feeder 23 is connected to the drive source 25 via a one-way clutch CL so that it can be rotated only in the forward direction. Therefore, the powder and granules are transferred to the conveyors 22a, 22b, 22.
c, even if the drive source 25 is reversed and the conveyors 22a, 22b, 22c are reversed, the quantitative rotary feeder 23 will not reverse and stop rotating due to the operation of the one-way clutch CL. Therefore, the jammed state is released and the conveyors 22a, 22
When b, 22c and the metering rotary feeder 23 are driven in normal rotation again, the metering rotary feeder 23 can immediately start feeding a certain amount of powder or granular material, so the feeding amount of the metering rotary feeder 23 can be maintained at all times. It can be kept exactly constant.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, and FIG. 1 is a side view of a section taken along the line - in FIG. 3, FIG. 2 is a partial side view of a section taken along the line - in FIG. Fig. 1 is a cross-sectional plan view taken along the - line in Fig. 1, Fig. 4 is a rear view taken in the - line cross-section in Fig. 1, and Fig. 5 is a power transmission between the conveyor installed in the rear chamber, quantitative rotary feeder, and hydraulic motor. Enlarged sectional view showing the mechanism, No. 6
The figure is a hydraulic circuit diagram of the drive system of the device of the present invention, and FIG. 7 is an electrical control circuit diagram of the drive system. 3...Bethel, 22a, 22b, 22c...
Conveying car and stirring wheel as a conveying machine, 23... fixed-quantity rotary feeder, 23a... opening as a discharge port, 25... hydraulic motor as a drive source, CL...
…One-way clutch.

Claims (1)

[Claims] 1 Incline the betu cell 3 containing powder and granules such as coarse aggregate, sand, and cement inside, and discharge the powder to the outlet 2.
3a, which is a device for feeding from the vessel 3
A metering rotary feeder 23 is rotatably provided at the discharge port 23a of the vessel 3 for always feeding a fixed amount of powder or granules from the vessel 3, and the metering rotary feeder 23
Conveying machines 22a, 22b, 22c that continuously convey the powder and granular material to the quantitative rotary feeder 23 are disposed on the upstream side of the
are rotatably provided, and the transport machines 22a, 22b,
22c is connected to the drive source 25 so that it can be driven in the forward and reverse directions, and the quantitative rotary feeder 23 is connected to the drive source 25 through the one-way clutch CL so that it can be driven to rotate only in the forward direction. Become.
Powder quantitative feeding device.