JP3610790B2 - Crane drum lock device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement of a drum lock device as a crane safety device.
[0002]
[Prior art]
In general, a crane moves a suspended load in the vertical direction by winding or unwinding a wire for hanging with a winch drum. In a lattice boom crane, a wire is connected to the tip of the boom, and the boom is raised and lowered by winding or unwinding the wire with a winch drum.
[0003]
In addition, the crane may interrupt the work while the load is suspended after the work, and in that case, in order to prevent the suspended load or the boom from dropping due to the leakage phenomenon of the hydraulic motor of the winch, the concave convex 12 provided at the outer peripheral edge, and so as to lock by hooking a claw 13 on the unevenness 12 (see FIG. 2).
[0004]
[Problems to be solved by the invention]
The means for stopping the operation in the drum lowering direction by hooking the claw 13 on the unevenness 12 is called a crane drum lock device, and is an important facility as equipment is required as a safety device. By the way, when manually hooking the nail, the operator often forgets to hook the nail by carelessness. In addition, there is a semi-automatic type that is configured so that the claw is latched when the lever is neutral in conjunction with the operation lever, but in this case also, the claw may not be accurately hooked due to a failure of the lock mechanism. In the past, it has been a problem that the function as a safety device has not been sufficiently performed.
[0005]
The present invention has been made to solve such problems. Therefore, the object of the present invention is to prevent the state where the nail is not locked due to human carelessness or mechanical failure. Even if it occurs, it is possible to reliably notify an operator or the like of this, thereby improving safety and improving the reliability of the crane device.
[0006]
[Means for Solving the Problems]
The present invention has the following configuration in order to achieve the above object. That is, the invention according to claim 1 of the present invention is a crane drum lock device provided with means for stopping the operation in the drum lowering direction by hooking the claws on the unevenness provided on the outer periphery of the drum of the crane. Lock detection means that detects whether or not the claw is hooked on the unevenness, the crane engine is switched from rotating to stop, the engine key switch is switched from ON to OFF, and the operation of the boarding / exiting lever etc. based on the means is at least one of the switches to an inoperative side the operable side is executed, and a lock discrimination means for discriminating that it should hooking nails uneven, nails are not hooked Alarm detecting means for detecting that the lock catching means has forgotten to be hooked when the lock discriminating means discriminates that the lock detecting means has detected that the hook is to be hooked. It is characterized in.
[0007]
The invention of claim 2 according to the present invention, with respect to the claim 1, wherein the drum locking device, the alarm means are formed to a predetermined time outputting an alarm output and said Rukoto.
[0008]
According to the present invention as described above, when the drum lock is not securely established even though the claws should be hooked, the alarm means issues an alarm. The safety will be established. In addition, when the engine is stopped, the work is finished, or the crane is disengaged, forgetting to catch the claws can be prevented in advance, thereby improving safety.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a hydraulic drive device for a hydraulic machine according to the present invention will be described below with reference to FIGS. 1 to 4 in which examples of the embodiment according to the present invention are shown.
[0010]
FIG. 1 is an explanatory diagram of switch, sensor, and alarm operation elements in a crane controller according to an example of an embodiment of the present invention, and FIG. 2 shows an installation state of a main winding drum lock proximity sensor in the crane controller. In the structure diagram, (A) is a plan view and (B) is a front view. FIG. 3 is a flowchart showing the operation state of the drum lock device in the crane controller, and FIG. 4 is a detailed internal view of the circle A portion and the circle B portion in the flowchart shown in FIG.
[0011]
The crane controller shown in FIG. 1 includes a key switch 2 connected to the positive electrode of a storage battery 1 serving as a power source, an alarm means 3 having an alarm buzzer B and an alarm lamp L, a main drum lock sensor 4, an auxiliary drum lock sensor. 5, signal systems for each of the boom drum lock sensor 6, the engine rotation sensor 7, and the entrance / exit cutoff limit switch 8 are provided.
[0012]
The signal system of the key switch 2 is set to the engine ON side and outputs an ON signal, and is set to the engine OFF side and outputs an OFF signal. And the alarm lamp L is turned on.
[0013]
The signal system of the main winding drum lock sensor 4 outputs an OFF signal in a drum lock state in which a later-described claw is hooked on an uneven surface to be described later, and outputs an ON signal in an unlocked drum lock state. The signal systems of the auxiliary winding drum lock sensor 5 and the boom drum lock sensor 6 are the same as those of the main winding drum lock sensor 4. Each signal system of the sensors 4, 5 and 6 forms a lock detecting means which is one of the components characterizing the present invention, that is, means for detecting the presence or absence of a state where the nail is hooked on the unevenness. doing.
[0014]
The signal system of the engine rotation sensor 7 detects the number of revolutions of the engine and outputs a stop signal below 500 rpm and an operation signal at a rotation exceeding 500 rpm. Outputs an ON signal when shut off (can be operated) and an OFF signal when opened.
[0015]
In this embodiment, when the engine is switched from rotating to stopping, or when the key switch 2 is switched from the engine ON side to the engine OFF side, or the boarding / shut-off cutoff limit switch 8 changes from the ON signal to the OFF signal. When the main drum lock sensor 4, the auxiliary drum lock sensor 5, or the boom drum lock sensor 6 is outputting an ON signal at the time of switching, an operation output is output to the alarm means 3, and each of the sensors 4, 5 , 6 are all OFF signals so that the operation output is turned off.
[0016]
In this case, each signal system for the key switch 2, the engine rotation sensor 7, and the boarding / alighting cutoff limit switch 8 locks the claw on the unevenness, that is, one of the components that characterize the present invention. A means for discriminating whether or not to be necessary is formed, and this is clarified by the operation explanation based on the flowchart of FIG.
[0017]
In addition, in the present invention, it is possible to add a timer processing means for cutting the output of the alarm means 3 at a constant time such as 30 seconds to prevent so-called battery exhaustion. The sensors 4, 5 and 6 may be of a reverse operation type in which an ON signal is output in the drum locked state and an OFF signal is output in the drum non-locked state. A non-contact type proximity switch, an ultrasonic switch, or a contact type limit switch can be appropriately selected and used.
[0018]
Next, the installation mode of the main winding drum lock sensor 4 will be described with reference to FIGS. A main drum 9 is attached to a crane carriage together with a winch 10 connected coaxially. A circular rod 11 is integrally provided at the outer peripheral end portion of the main winding drum 9 for winding the wire for suspending the load, and irregularities 12 are provided on the outer peripheral portion of the circular rod 11.
[0019]
A claw 13 is attached to the crane frame of the crane so as to be able to swing in the up-and-down direction. The claw 13 is opposed to the concavo-convex 12 so that the claw toe can be engaged with or detached from the concavo-convex 12. Are arranged. A drum lock operation cable 14 extended from the cab is connected to the claw 13, and when the operator pulls the cable 14 on the cab side, the claw 13 is engaged with the unevenness 12, Moreover, the nail | claw 13 can be made to detach | leave from the unevenness | corrugation 12 by pushing reversely.
[0020]
The irregularities 12 shown in the figure have a structure similar to a ratchet gear, and in the state where the claw 13 is engaged, in the case of lifting the load, the drum rotates smoothly as a follow-up tooth, and conversely the load is suspended. In the case of lowering, the pawl action works to brake the drum rotation.
[0021]
A plate 15 made of steel is fixed to the claw 13 at the middle position of the back, and this plate 15 is formed to act as a body to be detected with respect to a main drum lock sensor 4 described later. .
[0022]
A main drum lock sensor 4 as a lock detecting means is provided adjacent to the plate piece 15 on the side thereof. As the main drum lock sensor 4, a magnetically sensitive proximity switch is used in the present embodiment, and the detection end portion is a short distance from the plate piece 15 in the claw 13 separated from the unevenness 12. The sensor 4 is attached to the carriage frame so as to be positioned on the side of the carriage.
[0023]
Main hoist drum lock sensor formed by providing As this 4 depending on the pawl 13 is engaged with the irregularity 12 or plate piece 15 in accordance with the displacement of time of the withdrawal, that spaced-approaching the detection end portion Thus, it is possible to detect the presence / absence of a state in which the claw 13 is hooked on the unevenness 12 by outputting a magnetic-electrically converted signal.
[0024]
In Figure 2, it has been described main hoist drum lock sensor 4, the auxiliary winding drum lock sensor 5, the boom drum lock sensor 6 is also intended to lock detecting means is provided at the case in the same manner of the sensor 4 It is.
[0025]
With respect to the crane controller according to the above-described embodiment, the operation state of the drum lock device will be described below with reference to the flowcharts shown in FIGS. In this flowchart, the alarm means 3 outputs the alarm buzzer B and the alarm lamp L for a predetermined time (30 seconds) by a timer.
[0026]
1. Before work, key switch (key SW) 2 is OFF, engine (E / G) rotation <500 rpm (determined to be stopped), boarding / shut-off cutoff switch (L / S) 8 is OFF (non-working not shut off) If the key switch (key SW) is ON? (S1) → N → Key flag ON? (S2) → N → Timer ≧ 30 seconds? (S22) → N → E / G rotation <500 rpm? (S5) → N → E / G flag ON? (S6) → N → Timer ≧ 30 seconds? (S22) → N → Entrance / Departure L / SON? (S9) → N → Getting on / off blocking flag ON? (S10) → N → Timer ≧ 30 seconds? (S22) → N → Key flag ON & E / G flag ON & boarding / alighting-off flag ON? (S13) → N → Main winding drum lock sensor 4 OFF & auxiliary winding drum lock sensor 5 OFF & boom drum lock sensor 6 OFF? (S14) →
[1] In the case of Y → alarm buzzer B and alarm lamp LOFF, timer reset (S15) → return to (1) before (S1).
[2] Case of N → Return to (1) before (S1), that is, the case where the lock discriminating means discriminates that it is not necessary to latch the claw.
[0027]
2. Next, when the operator starts work, the key SWON, the E / G rotation> 500 rpm, the entry / exit cutoff L / SON, and the flow is (S1) → key flag ON (S3) → (S5) → E / G flag ON (S7 ) → (S9) → Get-off / off flag ON (S11) → (S13) → (S15) → The output of the alarm means remains OFF and the process returns to (1) before (S1). This is also the case when the lock discriminating means discriminates that there is no need to hook the pawl.
[0028]
3. Next, when the key switch (key SW) 2 is turned OFF, the key SWON? (S1) → N → Key flag ON? (S2) → Y → key flag OFF (S4) → main winding drum lock sensor 4ONOR auxiliary winding drum lock sensor 5ONOR boom drum lock sensor 6ON? (S16) →
[1] If Y (any drum is not locked)-> Reset timer (S17)-> Start timer (S18)-> Alarm buzzer B and alarm lamp L are ON (S19)->(S5)-> (S7) → (S9) → (S11) → (S13) → (S14) → return to (1) before (S1), that is, the lock discriminating means needs to hook the pawl. In this case, the alarm means warns of forgetting to catch the nail.
[2] If N (all drums are locked) → Timer reset (S20) → Alarm buzzer B and alarm lamp LOFF (S21) → (S5) → (S7) → (S9) → (S11) → (S13) → (S15) → Return to (1) before (S1), that is, the case where the lock discriminating means discriminates that it is no longer necessary to hook the claw.
[0029]
4). Next, 3. In the case of [1], when 30 seconds have passed, the key SWON? (S1) → N → Key flag ON? (S2) → N → Timer ≧ 30 seconds? (S22) → Y → Timer reset (S23) → Alarm buzzer B and alarm lamp LOFF (S24) → Key flag ON & E / G flag ON & boarding / shut-off flag ON? (S13) → N → Main winding drum lock sensor 4 OFF & auxiliary winding drum lock sensor 5 OFF & boom drum lock sensor 6 OFF? (S14) → N → Return to (1) before (S1), that is, when the alarm means stops sending the alarm after 30 seconds.
[0030]
5.3. If all the drums are locked when the timer is less than 30 seconds after the key is pressed, the key SWON? (S1) → N → Key flag ON? (S2) → N → Timer ≧ 30 seconds? (S22)->N-> E / G rotation <500 rpm ? (S5)->Y-> E / G flag ON (S7)-> Entry / exit cutoff L / SON (S9)-> Entry / exit cutoff flag ON (S11)-> Key flag ON & E / G flag ON & boarding / shut-off flag ON? (S13) → N → Main winding drum lock sensor 4 OFF & auxiliary winding drum lock sensor 5 OFF & boom drum lock sensor 6 OFF? (S14) → Y → alarm buzzer B and alarm lamp LOFF, timer reset (S15) → return to (1) before (S1), that is, the lock discriminating means no longer has to hook the pawl. Is the case of discriminating.
[0031]
As is clear from the explanation of the operation state described above, an alarm is generated when there is a case where the claw is not hooked on the unevenness even though the lock discriminating means discriminates that the hook needs to be hooked. By means of this, it is possible to promptly warn of forgetting to catch the nail, thereby making it possible to reliably notify the operator or the like that the situation is dangerous.
[0032]
【The invention's effect】
The present invention is implemented in the form described above, and has the following effects.
[0033]
According to the present invention , the lock detecting means for detecting the presence / absence of the state where the nail is hooked on the unevenness, the lock discriminating means for discriminating whether or not the nail should be hooked on the unevenness, and the nail is hooked. By providing the drum lock device with alarm means for warning that the lock detection means detects that there is not and the lock discrimination means discriminates that the claw should be hooked, It is possible to prevent forgetting to catch the nail.
[0034]
The present invention also allows the operator to stop the engine in the case of a model that does not stop the engine by interlocking with the key switch, by alarming when the nail is forgotten when the engine is stopped from rotating. Thus, when the work is finished, forgetting to hook the nails can be eliminated, and the safety is particularly improved. In addition, in the case of a model in which the engine stops by interlocking with the key switch, the alarm is similarly given when the key switch is turned from ON to OFF, so that the nail of the nail when the operation is finished by operating the key switch It is possible to eliminate forgetting the hook. [0035]
The present invention also provides an alarm if the forgetting to catch the nail when the driving operation means such as the getting-on / off lever is switched from the operable side to the non-operable side, so that the engine is kept running and in the key-on state. Safety can be ensured by preventing the operator from forgetting to hook the nails when the operator tries to leave the crane.
[0036]
Further, according to the present invention , the alarm means is configured to output the alarm output for a certain period of time, so that an alarm is generated even if the nail is hooked to the property due to a failure or the like. Even in this case, the battery output can be prevented by avoiding alarm output for a long time.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of switches, sensors, and operating elements in a crane controller according to an embodiment of the present invention.
FIGS. 2A and 2B show an installation mode of a main winding drum lock sensor 4 in a crane drum lock device according to an embodiment of the present invention, where FIG. 2A is a plan view and FIG. 2B is a front view.
FIG. 3 is a flowchart showing an operation state of the drum lock device in the controller of the crane according to the embodiment of the present invention.
FIG. 4 is a detailed content diagram of a circle A part and a circle B part in the flowchart shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Storage battery 2 ... Key switch 3 ... Alarm means 4 ... Main winding drum lock sensor 5 ... Supplementary winding drum lock sensor 6 ... Boom drum lock sensor 7 ... Engine rotation sensor 8 ... Entrance / exit cutoff limit switch 8
DESCRIPTION OF SYMBOLS 9 ... Main winding drum 10 ... Winch 11 ... Circular rod 12 ... Concavity and convexity 13 ... Claw 14 ... Drum lock operation cable 15 ... Plate piece

Claims (2)

In the drum lock device of the crane provided with means for stopping the operation in the drum lowering direction by hooking the claw on the unevenness provided on the outer periphery of the crane drum, whether or not the claw is hooked on the unevenness The lock detection means to detect, the crane engine switching from rotating to stopping, the engine key switch switching from ON to OFF, and the driving operation means such as the boarding / alighting cutoff lever from the operable side to the inoperable side based on that one at least one is performed, and a lock discrimination means for discriminating that it should hooking nails uneven, nail detects the lock detecting means that it is not hooked, and the claw hanging And a warning means for warning that the hook is forgotten to be locked when the lock discriminating means discriminates what should be stopped. Click device. Alarm means, crane drum locking device according to claim 1, wherein the warning output Ru is formed to output a predetermined time.

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