JP2010269286A - Vibration machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration machine suppressing occurrence of resonance of vibrator. <P>SOLUTION: A vibration screen is provided with a sieve device body 46 elastically supported by a conveyer frame 20; a vibration device 48 vibrating the sieve device body 46; a hydraulic drive unit 70 including a hydraulic motor 73 for the vibration device 48 and supplying working oil to the hydraulic motor 73; and starting switches 63a1 and 63a3 indicating start of the vibration device 48. The vibration device is provided with a detector 82 detecting the rotation speed S of a hydraulic pump 72 in relation to the rotation speed of the hydraulic motor 73, and a controller 76 having a start interlocking function invalidating starting indication of the oscillation device 48 by the starting switches 63a1 and 63a3, when a detected value from the detector 82 is smaller than the control threshold S1 based on a lower limit vibration number set in a zone higher than the natural frequency of the sieve device body 46. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vibrating machine including a vibrating screen, a vibrating feeder, a road compacting machine, and the like.

  Vibrating machines perform functions such as sieving objects, supplying them to subsequent machines, or occupying and solidifying the ground by vibrating the vibrating body. For example, vibrating screens, vibrating feeders, road compacting machines, etc. This is a representative example. For example, a vibration feeder is often used to supply a material to be crushed to a jaw crusher. However, there is one that automatically reduces or stops vibration of the vibration feeder when the load of the jaw crusher increases (Patent Document 1). Etc.).

Japanese Patent Laid-Open No. 11-226446

  At this time, since the rated frequency of the vibration machine is generally set to a value higher than the natural frequency (resonance point) of the vibrating body, the actual frequency of the vibrating body passes the natural frequency at the time of starting / stopping. Usually, in the process of starting / stopping the vibrating machine, the vibration frequency of the vibrating body coincides with the natural frequency for a moment, and resonance does not occur frequently.

  However, when the hydraulic oil cannot be supplied satisfactorily from the hydraulic pump to the hydraulic motor that vibrates the vibrating body, for example, when the engine speed has not increased sufficiently, vibrations occur in a band lower than the rated frequency. The body vibrates. Even during operation, the frequency of the vibrating body can be lowered to a band lower than the rated frequency due to an increase in the load applied to the vibrating body. If the operation near the natural frequency is continued in this way, the vibrating body may resonate. If the resonance occurs, not only the amplitude of the vibrating body itself becomes excessive, but also the body on which the vibrating machine is mounted. The overall vibration becomes excessive, causing an unnecessarily heavy load on each part of the aircraft, and there is concern about the psychological burden on the operator.

  In the above prior art, the vibration feeder is automatically controlled in accordance with the load of the jaw crusher. However, the vibration feeder does not depend on whether or not a sufficient amount of hydraulic fluid can be supplied to the hydraulic motor of the vibration feeder. Since it is controlled, the above-mentioned technical problems relating to resonance are also inherent.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a vibrating machine that can suppress the occurrence of resonance of a vibrating body.

  In order to achieve the above object, a first invention includes a frame, a vibration body elastically supported by the frame, a vibration device that vibrates the vibration body, and a hydraulic motor of the vibration device. In a vibration machine including a hydraulic drive device that supplies hydraulic oil to the hydraulic motor and an activation switch that instructs activation of the vibration excitation device, a state relating to a rotational speed of the hydraulic motor provided in the hydraulic drive device When the detection value from the detector is smaller than a control threshold value based on a lower limit frequency set in a band higher than the natural frequency of the vibrator and the natural frequency of the vibrator, to the excitation device by the start switch And a control device having a start interlock function for invalidating the start instruction.

  The second invention further comprises an interlock release means for instructing the release of the interlock function in the first invention, and the control is performed when the interlock function is released by the interlock release means. The apparatus drives the vibration exciter according to the operation of the start switch regardless of the detection value of the detector.

  A third invention includes a frame, a vibration body elastically supported by the frame, a vibration device for vibrating the vibration body, and a hydraulic motor for the vibration device. In a vibration machine including a hydraulic drive device to be supplied, a detector that is provided in the hydraulic drive device and detects a state quantity related to a rotation speed of the hydraulic motor; A control device having a stop interlock function for stopping the vibration excitation device when a detection value from the detector becomes smaller than a control threshold value based on a lower limit frequency set in a band higher than the frequency. It is characterized by.

  According to a fourth invention, in the third invention, the detector is a flow meter that detects a supply flow rate of hydraulic oil to the hydraulic motor as the state quantity.

  According to a fifth aspect of the present invention, in any one of the first to third aspects, the detector determines a rotational speed of a hydraulic pump that supplies hydraulic oil to the hydraulic motor or a prime mover that drives the hydraulic pump. It is a rotation speed detector detected as

  In a sixth aspect based on any one of the first to third aspects, the detector is a control valve that controls hydraulic oil to the hydraulic motor, or a regulator of a hydraulic pump that supplies hydraulic oil to the hydraulic motor. This is a signal detector that detects the control signal as the state quantity.

  According to the present invention, the occurrence of resonance of the vibrating body can be suppressed.

It is a side view showing the whole composition of a self-propelled vibration screen carrying a vibration device concerning a 1st embodiment of the present invention. It is an enlarged view showing the whole structure of the self-propelled vibration screen carrying the vibration apparatus which concerns on 1st Embodiment of this invention. It is an external view of the panel surface of the operation panel with which the vibration apparatus which concerns on 1st Embodiment of this invention was equipped. It is a circuit diagram showing simply the part about operation of the vibration generator of the hydraulic drive unit with which the vibration device concerning a 1st embodiment of the present invention was equipped. It is a flowchart showing the procedure of the interlock control by the control apparatus with which the vibration apparatus which concerns on 1st Embodiment of this invention was equipped. It is the circuit diagram which represented simply the part regarding operation | movement of the vibration apparatus of the hydraulic drive device with which the vibration apparatus which concerns on 2nd Embodiment of this invention was equipped. It is a flowchart showing the procedure of the interlock control by the control apparatus with which the vibration apparatus which concerns on 2nd Embodiment of this invention was equipped. It is the circuit diagram which represented simply the part regarding operation | movement of the vibration apparatus of the hydraulic drive device with which the vibration apparatus which concerns on 3rd Embodiment of this invention was equipped. It is the circuit diagram which represented simply the part regarding operation | movement of the vibration apparatus of the hydraulic drive device with which the vibration apparatus which concerns on 4th Embodiment of this invention was equipped. It is a circuit diagram showing simply the part about operation of the oscillating device of the hydraulic drive provided with the oscillating device concerning a 5th embodiment of the present invention. It is a side view showing the whole self-propelled crusher composition which is an example of other applicable objects of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing the entire configuration of a self-propelled vibrating screen equipped with the vibration device according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of the vicinity of the operation panel. The left and right sides in FIGS. 1 and 2 are the front and rear sides of the self-propelled screen.

  The self-propelled vibrating screen shown in FIGS. 1 and 2 includes a traveling body 1, a discharge conveyor 2 provided on the traveling body 1, a sieve device (vibration device) 3 provided on the upper side of the discharge conveyor 2, A power pack 4 provided below the discharge conveyor 2 is provided.

  The traveling body 1 includes a pair of left and right traveling means 10 and a main body frame 11 provided on the upper part of the traveling means 10. The travel means 10 includes a pair of left and right track frames 12, driven wheels 13 and drive wheels 14 provided on the front and rear sides of the track frames 12, a travel hydraulic motor 15 having an output shaft connected to the drive wheels 14, An endless track crawler belt 16 wound around the driven wheel 13 and the driving wheel 14 is provided. The main body frame 11 is a frame-like member that is three-dimensionally assembled with a plurality of steel materials extending in the vertical, horizontal, and front-rear directions, and is provided at the upper part of the track frame 12. The front end portion is located behind the front end portion of the traveling means 10 so as not to protrude. The rear end portion of the main body frame 11 is located slightly behind the rear end portion of the traveling means 10. A guard 17 for preventing wood interference between the discharge conveyor 2 and the sieving device 3 is provided at the rear part of the main body frame 11.

  The discharge conveyor 2 conveys a sorted product of a predetermined particle size or less sorted by the sieving device 3 and discharges it to the front of the machine body, and is disposed so as to rise obliquely toward the front. The discharge conveyor 2 includes a conveyor frame 20, a head pulley 21 that is rotatably provided at the front end of the conveyor frame 20, a tail pulley (not shown) that is rotatably provided at the rear end of the conveyor frame 20, and a head pulley 21. And a conveyor belt 23 wound around the tail pulley and a discharge conveyor hydraulic motor 24 connected to the head pulley 21, and the head pulley 21 is driven by the discharge conveyor hydraulic motor 24, so that the head pulley 21 and the tail pulley are connected to each other. The conveyor belt 23 is circulated and driven.

  The conveyor frame 20 has a rear end portion connected to a rear end portion on the upper portion of the main body frame 11 via a rotation shaft 30 so as to be tiltable, and a central portion in the front-rear direction is connected to the main body frame 11 via a support member 31. It is supported by. The support member 31 includes a cylindrical casing 32 and a rod 33 inserted therein, and the upper end of the casing 32 is attached to a bracket 35 provided at the front and rear center of the conveyor frame 20 via a pin 34, and the lower end of the rod 33. Each part is rotatably connected to a bracket 37 provided at the front part of the main body frame 11 via a pin 36. The casing 32 and the rod 33 of the support member 31 are connected by a hydraulic cylinder 38, and the rod 33 slides relative to the casing 32 as the hydraulic cylinder 38 expands and contracts. As a result, the rotating shaft 30 serves as a fulcrum. The discharge conveyor 2 tilts. At this time, the safety fence 39 is positioned on the main body frame 11 so as to be positioned on the left and right sides of the conveyor frame 20 so as not to enter under the discharge conveyor 2 where the operator or the like tilts and be sandwiched between the main body frame 11. Is set up.

  The sieving device 3 sorts a material to be sorted according to the particle size. The sieving device 3 is a frame-type sieving device main body 46 (vibrating body) supported on an upper part of the rear part of the conveyor frame 20 through an elastic member 45 so as to be vibrated. ), A sieve member (not shown) fixed inside the sieve device main body 46, a vibration device 48 for vibrating the sieve device main body 46, and a hydraulic motor for the vibration device 48, And a hydraulic drive device 70 (FIG. 3) for supplying hydraulic oil. The vibration device 48 is driven to shake the sieve device main body 46 and the sieve member integrally, and the inputted sorting object is Among them, a sorted product having a predetermined particle size or less passing through the sieve member is guided onto the discharge conveyor 2 and a particle having a larger particle size is discharged to the rear of the machine body.

  In this embodiment, a rubber spring is used as the elastic member 45, but another elastic body such as a coil spring may be used. The elastic members 45 are arranged on the left and right sides of the sieving device main body 46 in the front-rear direction. Further, the sieving device 3 is arranged with the center of gravity slightly shifted rearward with respect to the traveling means 10 as a whole, and the inner sieving member is arranged in a posture inclined downward toward the rear like the discharge conveyor 2. Yes. Since the sieving device 3 is supported by the conveyor frame 20 of the discharge conveyor 2, the tilting angle of the discharge conveyor 2 can be changed according to the properties of the object to be selected to adjust the sorting capability.

  The power pack 4 incorporates a power source of an operating device mounted in various parts of the machine body such as an engine, a hydraulic pump, a control valve, etc., and is loaded on a power pack frame 50 suspended from the conveyor frame 20 and discharged to the discharge conveyor 2. Located on the underside. The power pack frame 50 is suspended from the conveyor frame 20 at a position in front of the bracket 34 to which the support member 31 is connected, and the power pack 4 is positioned in front of the traveling body 1. However, the front-rear position of the power pack 4 is limited so that the center of gravity of the machine body combined with other mounted devices such as the sieving device 3 and the discharge conveyor 2 comes to a substantially central position in the front-rear direction of the traveling device 10. Accordingly, when the hydraulic cylinder 38 is contracted and the discharge conveyor 2 is laid down, the power pack 4 is lowered to the space in front of the traveling body 1 without overlapping the upper portion of the traveling body 1. Therefore, the discharge conveyor 2 can be laid down to a horizontal position, and the total height of the machine body can be suppressed to a range that falls within the transport limit height of a general road during transportation.

  In addition, when there is a margin up to the transport limit height and it is not necessary to lower the power pack 4 to the space in front of the traveling body 1, the power pack 4 can be installed on the main body frame 11 or the truck frame 12. .

  An operation panel 51 is provided on the left side surface of the power pack 4 to instruct the operation of the discharge conveyor, the sieve device 2 and the like. An operation unit 52 is provided adjacent to the operation panel 51 for instructing the expansion / contraction operation of the hydraulic cylinder 38 described above. In addition, the power pack 4 is provided with a step 53 as a foothold on which an operator stands when operating the operation panel 51 or the operation unit 52.

  Further, at the lower part of the discharge conveyor 2, a scatter prevention cover 55 is provided for receiving the selected item falling from the return surface of the conveyor belt 23. The anti-scattering cover 55 covers at least the upper portion of the power pack 4, and the vicinity of the lower end portion thereof is bent downward toward the rear, and the received sorting is received at a target accumulation position (for example, between the left and right traveling means 10). Active ground).

  FIG. 3 is an external view of the panel surface of the operation panel 51 described above.

  As shown in FIG. 3, the operation panel 51 includes a display input unit 61, an emergency stop switch 62, a start / stop instruction unit 63 for operating devices, a main switch (key switch) 64, an operation mode selection switch 65, and an alarm button 66. , An illumination button 67, an engine speed dial 68, an interlock release switch 69, and the like.

  The display input unit 61 displays the operating status of the machine, various data, messages, remaining fuel, engine coolant temperature, and various settings and inputs. The emergency stop switch 62 is a switch that immediately stops each operating device of the airframe in an emergency. The main switch 64 is a switch for operating the electrical system ON / OFF, engine start, and the like. The operation mode selection switch 65 is a switch for selecting one of a travel mode for performing a travel operation, a work mode for performing a crushing operation, and a maintenance mode set for maintenance. The alarm button 66 is a button for instructing an instruction to sound an alarm sound, and the illumination button 67 is a button for instructing the light amount setting of the illumination or turning it off. The engine speed dial 68 is a dial for adjusting the engine speed.

  The start / stop instruction unit 63 instructs each of the forward rotation button 63a1, the stop button 63a2, the reverse rotation button 63a3, and the discharge conveyor 2 to be started / stopped. A start button 63b1 and a stop button 63b2 are arranged.

  The interlock release switch 69 is a switch for instructing release of a start interlock described later in the second embodiment, and enables or disables the interlock function by switching the position to ON or OFF.

  FIG. 4 is a circuit diagram schematically showing a part related to the operation of the vibration device 48 of the hydraulic drive device.

  4 includes an operation panel 51 (described above), an engine 71, a hydraulic pump 72 driven by the engine 71, a hydraulic motor 73 of the vibration device 48, and the hydraulic pump 72 to the hydraulic motor 73. A three-position switching electromagnetic proportional control valve 74 for controlling the flow rate and direction of hydraulic oil supplied to the hydraulic oil, a hydraulic oil tank 75, a control device 76 for controlling the control valve 74, and the rotational speed of the hydraulic motor 73 Detectors 77a and 77b for detecting state quantities relating to

  The detectors 77 a and 77 b are flow meters provided in the hydraulic oil supply pipes 78 a and 78 b connected to the hydraulic motor 73, and supply flow rate of the hydraulic oil to the hydraulic motor 73 as a state quantity related to the rotational speed of the hydraulic motor 73. And the detected value is output to the control device 76.

  The control valve 74 has a position connecting the discharge line of the hydraulic pump 72 to the hydraulic oil supply pipe 78a (position on the left side in the figure), a position connecting the discharge line to the hydraulic oil supply pipe 78b (position on the right side in the figure), and It has a neutral position (center position in the figure) where both the hydraulic oil supply pipe lines 78a and 78b are blocked. However, the configuration is not limited to the configuration in which both the supply side and the discharge side of the hydraulic oil to the hydraulic motor 73 are shut off at the neutral position, but only one of them is shut off, or at least one of them is throttled to actively supply the hydraulic oil to the hydraulic motor 73. In some cases, the configuration is not.

  The control device 76 has a stop interlock function in addition to the function of switching and controlling the control valve 74 in accordance with operation signals from the operation panel 51, various settings, detection signals from the detectors 77a and 77b, and the like. The outline of the stop interlock function is as follows.

  First, in the present embodiment, the vibration frequency of the vibration device 48 during continuous operation (the number of rotations of the hydraulic motor 73) is a structure that vibrates integrally including the sieve device body 46, the sieve member, the vibration device 48, and the like ( The value of the band higher than the natural frequency of the “vibrating body” is assumed below, and the hydraulic motor 73 corresponding to the lower limit value (hereinafter referred to as “lower limit frequency”) of this assumed range is assumed. The oil supply flow rate is set as the control threshold S1. The natural frequency of the vibrating body can be calculated based on the weight of the vibrating body and the elastic coefficient of the elastic member 45 that elastically supports the vibrating body.

  The above stop interlock is based on the above premise and monitors the fluctuations in the detection values of the detectors 77a and 77b while the vibration device 48 is being driven. The detection values from the detectors 77a and 77b are controlled by the control threshold value S1. Is also smaller, the vibration device 48 is stopped. Specifically, the processing of step 107 of the control procedure described later with reference to FIGS.

  FIG. 5 is a flowchart showing the procedure of interlock control by the control device 76. Next, the operation of the vibration screen having the above configuration will be described with reference to FIG.

  After starting, for example, when an object to be sorted is put into the sieving device 3 by a loading heavy machine such as a hydraulic excavator, a recycling machine, a belt conveyor or the like, a thing smaller than the sorting particle size by the sieving member passes through the sieving member and is discharged to the conveyor. 2 is transported forward by the discharge conveyor 2 and discharged forward of the machine body. On the other hand, those larger than the selected particle size descend on the sieve member and are discharged to the rear of the machine body.

  During this operation, the control device 76 inputs the detection value (state quantity) S from the detectors 77a and 77b (step 103). The control device 76 determines whether or not there is a stop instruction (step 106). If there is an operation of the stop button 63a2 and there is a stop instruction for the sieving device 3, the control device 76 closes the control valve 74 and the hydraulic motor. The supply of hydraulic oil to 73 is shut off, the vibration device 48 is stopped, the sieve device 3 is shifted to the stopped state (step 108), and the procedure of FIG.

  During operation, the control device 76 monitors the detection value S from the detectors 77a and 77b and determines whether or not the value has fallen to a value lower than the control threshold value S1 (step 107). While the detection value S is changing at a value higher than the control threshold value S1, the operation of the sieving device 3 is maintained according to the operation and setting from the operation panel 51, and the procedure returns to step 106. However, when the value is reduced to a value smaller than the control threshold value S1 due to an increase in the load of the sieving device 3, the stop interlock function is activated, and the control device 76 closes the control valve 74 and shuts off the supply of hydraulic oil to the hydraulic motor 73. Then, the vibration device 48 is stopped and the sieve device 3 is shifted to the stop state (step 108), and the procedure of FIG.

  Next, the effect of this embodiment is demonstrated.

  According to the present embodiment, after the start-up, when the supply flow rate S to the hydraulic motor 73 falls below the control threshold S1 due to a change in the work load of the sieve device 3, the sieve device 3 is automatically stopped (stop) By the interlock function), it is possible to suppress the occurrence of resonance of the vibrator during operation.

  Therefore, according to the present embodiment, since the sieve device 3 can be stably operated while avoiding the natural frequency (resonance point) of the vibrating body, the amplitude of the vibrating body is stopped within an appropriate range, and the self-propelled vibrating screen Excessive vibration of the entire aircraft can be suppressed, the load on each part of the aircraft can be suppressed, and the psychological burden on the operator can be reduced by the stable behavior of the aircraft.

  In the present embodiment, the flow rate supplied to the hydraulic pump 72 is detected as means for detecting the state quantity related to the rotational speed of the hydraulic motor 73, but the present invention is not limited to this. A method of directly detecting the rotational speed of the hydraulic motor 73 is also conceivable, and an aspect described in the second and subsequent embodiments is also conceivable. In addition, depending on the state quantity to be detected, it is not limited to the interlock during operation, and has a start interlock function that prohibits the start of the sieving device 3 in a situation where a sufficient flow rate is unlikely to be supplied to the hydraulic motor 73. In some cases.

  In the following, several embodiments for detecting values other than the pump flow rate as state quantities relating to the rotational speed of the hydraulic motor 73 will be exemplified.

  FIG. 6 is a circuit diagram schematically illustrating a part related to the operation of the vibration device 48 of the hydraulic drive device provided in the vibration device according to the second embodiment of the present invention. Portions that are the same as or correspond to those in the first embodiment are denoted by the same reference numerals as those in FIG.

  In the present embodiment, a detector (rotation speed detector) 82 is provided on the drive shaft of the hydraulic pump 72, and the rotation speed of the hydraulic pump 72 is detected as a state quantity related to the rotation speed of the hydraulic motor 73. Therefore, the rotation speed of the hydraulic pump 72 corresponding to the lower limit frequency of the vibrating body is set as the control threshold S1 in the present embodiment.

  This embodiment is suitable when, for example, a variable speed reducer 81 is provided between the speed reducer 71 and the hydraulic pump 72 so that the rotational speed of the hydraulic pump 72 is variable.

  Further, in the present embodiment, the control device 76 has a start interlock function in addition to a function of switching and controlling the control valve 74 in accordance with an operation signal from the operation panel 51, various settings, a detection signal from the detector 82, and the like. Two interlock functions, a stop interlock function, are provided. The stop interlock function is the same as in the first embodiment.

  The activation interlock is detected at the time when an activation switch (the normal rotation buttons 63a1 and 63a3 in FIG. 3, which may be simply referred to as “activation switch” hereinafter) is operated to activate the sieve device 3. If the detected value from the detector 82 is smaller than the control threshold value S1, it means that the activation instruction of the vibration device 48 by the activation switch is invalidated. Specifically, the process of step 104 of the control procedure described later with reference to FIG.

  In this embodiment, the common control threshold S1 is used for the start interlock and the stop interlock, but different control thresholds may be set.

  FIG. 7 is a flowchart showing the procedure of the interlock control by the control device 76 of this embodiment. Next, the operation of the vibration screen having the above configuration will be described with reference to FIG.

  In operation, the start button 63b1 for the discharge conveyor 2 is operated to drive the discharge conveyor 2, and the “start switch” (start button 63a1 or 63a2) is operated to start the sieve device 3. If there is an input from the activation switch, that is, an operation instruction (step 101), the control device 76 moves on to the next procedure and determines whether the activation interlock is valid (step 102).

  When the position of the interlock release switch 69 (see FIG. 3) is ON and the activation interlock is valid, the control device 76 inputs the detection value (state quantity) S from the detector 82 (step 103). It is determined whether the detected value S is equal to or greater than the control threshold value S1 (step 104). As a result, if the pump rotational speed at that time is insufficient and the detected value S is smaller than the control threshold value S1, the activation interlock function works, and the control device 76 performs the procedure without driving the vibration device 48 in response to the operation instruction. Return to step 101.

  Conversely, if the pump rotation speed is sufficient and the detected value S is equal to or greater than the control threshold value S1 at the time of determination in step 104, the control device 76 opens the control valve 74 according to the operation instruction and operates the hydraulic motor 73. Oil is supplied and the vibration device 48 is driven to shift the sieve device 3 to an operating state (step 105). During the continuous operation of the sieving device 3, for example, when a material to be sorted is introduced into the sieving device 3 by a loading heavy machine such as a hydraulic excavator, a recycling machine, a belt conveyor, or the like, the sieving member is smaller than the sorting particle size by the sieving member. It passes through the transport surface of the discharge conveyor 2, is transported forward by the discharge conveyor 2, and is discharged forward of the machine body. On the other hand, those larger than the selected particle size descend on the sieve member and are discharged to the rear of the machine body.

  During this operation, the control device 76 determines whether or not there is a stop instruction (step 106). If there is an operation of the stop button 63a2 and there is a stop instruction for the sieve device 3, the control device 76 closes the control valve 74. Then, the supply of hydraulic oil to the hydraulic motor 73 is shut off, the vibration device 48 is stopped, the sieve device 3 is shifted to the stop state (step 108), and the procedure of FIG.

  During operation, while there is no stop instruction, the control device 76 monitors the detection value S from the detector 82 to determine whether or not it has fallen to a value lower than the control threshold value S1 (step 107). While the value S is changing at a value higher than the control threshold S1, the operation of the sieving device 3 is maintained according to the operation and setting from the operation panel 51, and the procedure returns to Step 106. However, when the value is reduced to a value smaller than the control threshold value S1 due to an increase in the load of the sieving device 3, the stop interlock function is activated, and the control device 76 closes the control valve 74 to shut off the supply of hydraulic oil to the hydraulic motor 73. Then, the vibration device 48 is stopped and the sieve device 3 is shifted to the stop state (step 108), and the procedure of FIG.

  In step 102, when the interlock release switch 69 is in the OFF position and the activation interlock is invalid, the control device 76 responds to the operation instruction regardless of the detection value of the detection value 82. The control valve 74 is opened and the vibration device 48 is driven to start the sieve device 3 (step 109). However, the operation of the sieving device 3 in this case is an operation limited to the operation of the start switch, unlike the continuous operation through the procedure of step 105. That is, the control device 76 determines the interruption of the operation signal from the activation switch (step 110), and continues the operation of the sieve device 3 while the operation signal from the activation switch is continuously input, If the operator's hand leaves and the start switch returns to the neutral position and the operation signal is interrupted, the procedure proceeds to step 108, the sieve device 3 is stopped, and the procedure of FIG.

  The control device 76 repeatedly executes the above procedure.

  Next, the effect of this embodiment is demonstrated.

  According to the present embodiment, the rotational speed S of the hydraulic pump 72 is compared with the control threshold value S1, the pump flow rate is insufficient, the pump rotational speed S does not reach the control threshold value S1, and the sieving device 3 is started as it is. In this case, when there is a possibility that the vibrating body may resonate in a band lower than the lower limit frequency, the activation instruction of the sieving device 3 is invalidated and the operation of the sieving device 3 is prohibited (activation interlock function). Thereby, generation | occurrence | production of the resonance of the vibrating body at the time of starting can be suppressed.

  Even during operation, when the rotational speed S of the hydraulic pump 72 falls below the control threshold value S1 due to fluctuations in the work load of the sieve device 3, the sieve device 3 is automatically stopped (stop interlock function). Thus, the occurrence of resonance of the vibrator during operation can also be suppressed.

  Therefore, according to the present embodiment, since the sieve device 3 can be stably operated while avoiding the natural frequency (resonance point) of the vibrating body, the amplitude of the vibrating body is stopped within an appropriate range, and the self-propelled vibrating screen Excessive vibration of the entire aircraft can be suppressed, the load on each part of the aircraft can be suppressed, and the psychological burden on the operator can be reduced by the stable behavior of the aircraft.

  Further, since the interlock release switch 69 is provided and the sieve device 3 can be forcibly driven regardless of the detection value of the detector 82, the sieve is temporarily used even when the pump flow rate is insufficient as in the case of maintenance, operation test, etc. When it is desired to move the device 3, the interlock device can be released and the sieve device 3 can be operated.

  Although not specifically described above, the activation interlock function is also released when the maintenance mode is selected with the operation mode selection switch 65. Therefore, the operation mode selection switch 65 can also function as an interlock release switch. FIG. 6 illustrates an example of determining whether the activation interlock function is valid / invalid by turning on / off the interlock release switch 69 (step S102). When the operation mode selection switch 65 functions as an interlock release switch, Whether the operation mode selection switch 65 selects the maintenance mode or another mode in step S102 is the basis for determining whether the interlock is valid or invalid. The activation interlock function is also invalidated when either of the interlock release switch 69 OFF and the operation mode selection switch 65 maintenance mode selection is satisfied.

  FIG. 8 is a circuit diagram schematically showing a part related to the operation of the vibration device 48 of the hydraulic drive device provided in the vibration device according to the third embodiment of the present invention. Portions that are the same as or correspond to those in the above-described embodiments are denoted by the same reference numerals as those in the above-described drawings, and description thereof is omitted.

  In the present embodiment, a detector (rotation speed detector) 83 is provided on the drive shaft of the prime mover 71, and the rotational speed of the prime mover 71 is detected as a state quantity related to the rotational speed of the hydraulic motor 73. Therefore, the rotation speed of the prime mover 71 corresponding to the lower limit frequency of the vibrating body is set as the control threshold value S1 in the present embodiment.

  In the case of the present embodiment, for example, the motor 71 and the output shaft of the hydraulic pump 72 are connected, and this is suitable when the rotational speed of the hydraulic pump 72 depends on the engine rotational speed, and a sufficient flow rate is supplied to the hydraulic motor 73. When the detected value S of the detector 83 is less than the control threshold value S1, the start interlock and the stop interlock function in the same manner as in the second embodiment. The control procedure by the control device 76 at that time can be basically the same as that of the second embodiment (the flowchart of FIG. 7).

  The other points are the same as in the second embodiment, and the occurrence of resonance of the vibrating body can be suppressed even with the configuration of the present embodiment.

  FIG. 9 is a circuit diagram schematically showing a part related to the operation of the vibration device 48 of the hydraulic drive device provided in the vibration device according to the fourth embodiment of the present invention. Portions that are the same as or correspond to those in the above-described embodiments are denoted by the same reference numerals as those in the above-described drawings, and description thereof is omitted.

  In this embodiment, a detector 85 detects a control signal to the control valve 74 as a state quantity related to the rotational speed of the hydraulic motor 73. Therefore, a control signal to the control valve 74 corresponding to the lower limit frequency of the vibrating body is set as the control threshold S1 in the present embodiment. The present embodiment is suitable when the driving speed of the sieving device 3 can be changed by the operation panel 51, specifically, when the opening degree of the control valve 74 can be operated by the operation panel 51.

  As a control signal to the control valve 74 that is a detection target of the present embodiment, a current signal output from the control device 76 to the solenoid drive unit of the control valve 74 or PWM (Plus Width Modulation) according to the operation of the operation panel 51. A signal is included. Thus, when an electrical signal is detected, an ammeter or a voltmeter can be installed as a detector 85 in the signal line. In some cases, the control command value generated in the control device 76 may be used as the detection value S. In this case, a functional unit that calculates and generates a control signal in the control device 76 may be a detector. Furthermore, even if the command itself is an electrical signal, a pilot-actuated electromagnetic proportional valve that uses hydraulic pressure to operate the spool may be used as the control valve 74. In this case, the control device 76 corresponding to the operation panel 51 is used. The pilot pressure guided to the pilot drive unit (not shown) of the control valve 74 as a result of this command can also be detected as a control signal to the control valve 74. In this case, a pressure gauge is installed in the pilot signal line.

  Also in this embodiment, when the situation is insufficient to supply a sufficient flow rate to the hydraulic motor 73, that is, when the detection value S of the detector 85 is less than the control threshold value S1, the second embodiment. The start interlock and the stop interlock function in the same manner. The control procedure by the control device 76 at that time can be basically the same as that of the second embodiment (the flowchart of FIG. 7).

  The other points are the same as in the second embodiment, and the occurrence of resonance of the vibrating body can be suppressed even with the configuration of the present embodiment.

  FIG. 10 is a circuit diagram schematically showing a part related to the operation of the vibration device 48 of the hydraulic drive device provided in the vibration device according to the fifth embodiment of the present invention. Portions that are the same as or correspond to those in the above-described embodiments are denoted by the same reference numerals as those in the above-described drawings, and description thereof is omitted.

  In the present embodiment, a regulator 86 for adjusting the tilt of the hydraulic pump 72 is provided, and the pump flow rate can be adjusted by controlling the tilt of the hydraulic motor 73 by the regulator 86. Then, a control signal to the regulator 86 is detected by the detector 87 as a state quantity relating to the rotational speed of the hydraulic motor 73. The control threshold value S1 in the present embodiment is a control signal to the regulator 86 corresponding to the lower limit frequency of the vibrating body.

  The operation of the regulator 86 depends on a pilot pressure from a pilot pump (not shown) or the like. A pressure reducing valve (not shown) for controlling the pilot pressure is controlled by a control signal from the control device 76. In the present embodiment, a configuration in which an electric signal (current signal or PWM signal) to the pressure reducing valve is detected by the detector 87 is exemplified. However, a configuration in which a pilot pressure that actually operates the regulator 86 is detected may be considered. It is done.

  In the present embodiment as well, when the situation is insufficient to supply a sufficient flow rate to the hydraulic motor 73, that is, when the detection value S of the detector 87 is less than the control threshold value S1, the second embodiment. The start interlock and the stop interlock function in the same manner. The control procedure by the control device 76 at that time can be basically the same as that of the second embodiment (the flowchart of FIG. 7).

  The other points are the same as in the second embodiment, and the occurrence of resonance of the vibrating body can be suppressed even with the configuration of the present embodiment.

  In the above description, the case where the present invention is applied to a vibrating screen has been described as an example. However, the present invention can also be applied to other vibrating devices. Next, a jaw crusher equipped with a vibration feeder, which is an example of another application target, will be exemplified.

  FIG. 11 is a side view showing the entire configuration of a self-propelled crusher which is another example of the application object of the present invention. The left and right sides in Fig. 1 are the front of the self-propelled crusher.

  The main parts will be briefly described. The self-propelled crusher shown in FIG. 11 is a large and small construction waste material generated at a construction site such as a concrete lump carried out at the time of building demolition or an asphalt lump discharged at road repair. -Industrial waste or rock or natural stone mined at a rock mining site or face is used as a material to be crushed, and a vibration feeder 103 for conveying the material to be crushed to a crushing device (jaw crusher) 102 is provided with a hopper 101. It is prepared below.

  The jaw crusher 102 is mounted on the main body frame 104 so as to be positioned in front of the hopper 101 and the vibration feeder 103 (right side in the drawing). Although not shown in detail, the driving force generated by the hydraulic motor for the crusher is transmitted to the flywheel with a belt and converted into a swinging motion of the moving tooth (not shown), thereby fixing the moving tooth. The object to be crushed supplied from the vibration feeder 103 is crushed into a predetermined size by swinging back and forth with respect to the teeth.

  The vibration feeder 103 is a so-called grizzly feeder, and is mounted on the rear side portion of the main body frame 104. The vibration feeder is vibrated by a hydraulic drive type vibration device 105 to convey the object to be crushed. To do. The vibrating body in the vibration feeder 103 is integrally formed by a feeder main body and a plurality of plates fixed inside the feeder main body in addition to the vibration device 105 itself. When the vibrating body is vibrated, the object to be crushed is sequentially conveyed to the jaw crusher 102 by vibration, and fine particles in the object to be crushed are shaken off from the serrated portion at the tip of the plate, and are passed through the chute 106. Fall down.

  The fallen fine particles are guided to the discharge conveyor 107 and discharged together with the crushed material crushed by the crushing apparatus 102 by the discharge conveyor 107.

  In addition, the configuration of the traveling body is the same as that of the vibrating screen shown in FIGS.

  The above-described first to fifth embodiments can be similarly applied to the vibration feeder 103 in this example, and the effects as already described in each embodiment can be obtained.

  Although there is no particular explanation about the influence of the inertia force due to the size of the vibrating body, since the inertial force increases as the vibrating body increases in size, the hydraulic motor operates by the action of the inertial force even after the supply of hydraulic oil is stopped. The pump may operate for a certain period of time and generate a pump effect due to the self-priming of the hydraulic motor. At this time, a mechanism for bypassing the hydraulic oil supply line connected to the hydraulic motor to the hydraulic oil tank with a hydraulic oil discharge line with a check valve, a makeup mechanism for supplementing the hydraulic oil to the negative pressure line, etc. However, the present invention is also applicable to such a case, and the same effect as described in each embodiment can be obtained.

  Also, in the above description, the case where the present invention is applied to a self-propelled vibrating screen or a self-propelled jaw crusher capable of self-propulsion has been described as an example, but the present invention is applicable to a towed traveling type, a portable type, a stationary type, etc. The present invention is also applicable, and the same effect can be obtained when the present invention is applied to them. The present invention can also be applied to other vibration machines such as road compacting machines, and the same effects can be obtained.

20 Conveyor frame (frame)
46 Sieve device body (vibrating body)
48 Exciter 63a1 Forward rotation switch (start switch)
63a3 Reverse switch (start switch)
69 Interlock release switch (Interlock release means)
70 hydraulic drive device 71 prime mover 72 hydraulic pump 73 hydraulic motor 74 control valve 76 control device 77a, b detector (flow meter)
82,83 detector (rotation speed detector)
85,87 detector (signal detector)
86 Regulator S Detection value S1 Control threshold

Claims (6)

A frame, a vibration body elastically supported by the frame, a vibration device that vibrates the vibration body, a hydraulic drive device that includes the hydraulic motor of the vibration device and supplies hydraulic oil to the hydraulic motor; , In a vibration machine comprising a start switch for instructing start of the vibration device,
A detector provided in the hydraulic drive device for detecting a state quantity relating to a rotational speed of the hydraulic motor;
Activation that invalidates the activation instruction to the excitation device by the activation switch when the detection value from the detector is smaller than the control threshold value based on the lower limit frequency set in a band higher than the natural frequency of the vibrating body A vibration device comprising a control device having an interlock function. An interlock release means for instructing release of the interlock function;
When the interlock function is released by the interlock release means, the control device drives the excitation device according to the operation of the start switch regardless of the detection value of the detector. The vibration device according to claim 1. A frame, a vibration body elastically supported by the frame, a vibration device that vibrates the vibration body, a hydraulic drive device that includes the hydraulic motor of the vibration device and supplies hydraulic oil to the hydraulic motor; In a vibration machine equipped with
A detector provided in the hydraulic drive device for detecting a state quantity relating to a rotational speed of the hydraulic motor;
While the vibration device is being driven, the vibration device is stopped when a detection value from the detector becomes smaller than a control threshold value based on a lower limit frequency set in a band higher than the natural frequency of the vibrating body. A vibration device comprising a control device having a stop interlock function.   The vibration device according to claim 3, wherein the detector is a flow meter that detects a supply flow rate of hydraulic oil to the hydraulic motor as the state quantity.   The said detector is a rotation speed detector which detects the rotation speed of the hydraulic pump which supplies hydraulic oil to the said hydraulic motor, or the motor | power_engine which drives this hydraulic pump as said state quantity. 4. The vibration device according to any one of items 3.   The detector is a control valve that controls hydraulic oil to the hydraulic motor, or a signal detector that detects, as the state quantity, a control signal to a regulator of a hydraulic pump that supplies hydraulic oil to the hydraulic motor. The vibration device according to any one of claims 1 to 3.

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