JPS63154600A - Load detecting recorder for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a lifting device used for lifting workers or materials and lowering unnecessary parts for work at high places, and in particular, Detects the uneven distribution of load when it is applied to the platform, prevents the lifting device from tilting or overturning, prevents boom damage due to overload, and records overload. The present invention relates to a load detection and recording device for an elevating device that can perform calculations.

[Conventional technology]

Assembling and painting in high places such as highways and building construction,
For repairs, a lifting device was used to raise and lower a lifting platform, and workers and materials were placed on this lifting platform to be lifted and lowered. In this conventional lifting device, the load of the worker or materials placed on the lifting platform is transferred to the supporting point of the lifting platform (
Unbalanced loads sometimes occur, where the load is not applied uniformly to the joints between the tip of each boom and the lifting platform, but only to specific support points. When this unbalanced load is applied to the lifting platform, it becomes unstable when the lifting platform is at a high position, causing accidents such as the lifting device tilting or falling over, which is extremely dangerous. In addition, even if the load is applied uniformly to the platform, if an overload larger than the set allowable load is applied, the boom that supports the platform will be subjected to more force than the limit, causing deformation or damage. This caused accidents to occur. For this reason, unbalanced load,
Means have been devised to detect overload.

[Problem that the invention seeks to solve]

However, with conventional equipment, when an unbalanced load or overload is detected, a warning is issued to prevent the lifting platform from rising, but this warning may be ignored and the platform is allowed to rise, which is repeated. There was a problem that the boom became fatigued. As this fatigue progresses, the boom may break or bend, which can be dangerous.
It is important to know the degree of boom fatigue;
Conventional devices have had the problem of not being able to detect this properly.

An object of the present invention is to provide a load detection and recording device for a lifting device that can detect and total overload.

[Means for Solving the Problems] The present invention, which has achieved the above object, connects a pair of internally hollow middle booms in an X-shape at approximately the center thereof, so as to be freely rotatable.
Inside each middle boom, the first and lower booms, which extend and retract at their ends, are slidably inserted, and the tips of the two booms are connected to the lifting platforms at intervals, and the lower In an elevating device in which the tips of the booms are connected to the base at intervals, the upper end of the upper boom and the lower surface of the elevating platform are elastically connected by a plate spring, and the upper boom is raised! 1. A detection switch is provided on either side of the base that operates when the plate spring is deformed by a load. A recording means is provided which can take in operation information from the detection switch and record and output at least the activation time and number of activations of the detection switch for each operator when the detection switch is activated continuously for a predetermined period of time or more. It is characterized by:

[Effect]

When a load of more than a certain level is applied to the leaf spring and the leaf spring is deformed and the detection switch is activated, the recording means stores the time data at the time of the detection and monitors the operating status of the detection switch. The recording means further continues to monitor the detection switch and stores operator information when the detection switch continues to operate for a certain period of time or more,
In addition, time data at the time when the detection switch is turned off is stored. Thereafter, the stored information is output as necessary.

This allows the overload condition to be accurately known.

〔Example〕

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

Fig. 1 is a side view of an elevating platform according to an embodiment of the present invention when it is lowered; Fig. 2 is a side view of the elevating platform according to the embodiment when the elevating platform is at its maximum rise; and Fig. 3 is a side view of the same embodiment. FIG. 4 is a rear view showing an example, and a sectional view showing the internal structure of the sensor.

In these figures, numeral 1 is the body of the trunk; body 1
A front wheel 2 and a rear wheel 3 are pivotally supported on the front, rear, left and right sides of the vehicle, and a driver's cab 4 is provided above the front wheel 2, and outriggers 5 are provided at the center and left and right of the rear end of the vehicle body 1, respectively. is fixed. A lifting mechanism 6 is placed on the top surface of the vehicle body 1, and a lifting platform 7 is installed on the top of the lifting mechanism 6.
A handrail 8 is provided around the elevator platform 7. The elevating mechanism 6 is composed of four telescopic booms, and each set of telescopic booms is composed of a middle boom 10, a lower boom 11, and an upper boom 12. The center of each middle boom 10 is rotatably connected in an X-shape by a connecting shaft 13, and connecting pieces 14 and 15 are fixed to the tips of the lower boom 11 and the upper boom 12, respectively. The connecting piece 14 is rotatably connected to a fixed piece 16 fixed on the vehicle body by means of a pin, and the connecting piece 15 is a support piece that is fixed to the lower surface of the elevator platform 7 and protrudes below the sensor unit 17. 8 and is rotatably connected by a bottle. In the state shown in FIG. 1, the spacing between the fixed pieces 16 and the supporting pieces 18 are the same, and the vehicle body 1 and the lifting platform 7 are configured to maintain a parallel state when the telescopic boom is extended in an X-shape. be. Each middle boom 10 includes each middle boom 1.
The lower boom 11 and the upper boom 12 inserted into the lower boom 11 and the upper boom 12 each extend and contract by the same amount, and a synchronizing mechanism (not shown) consisting of a chain or the like, and a hydraulic cylinder that pushes the lower boom 11 and the upper boom 12 from the middle boom 10 are housed. be.

FIG. 4 shows the configuration inside the sensor unit 17 mentioned above.
Channels 19 having a C-shaped cross section are fixed to the lower surface of the lifting platform 7 at intervals, and three plate springs 20, 21, and 22 are tightly attached to the lower surface of the channel 19.
The channel 19 and the leaf springs 20 to 22 are connected by a port 23. The lengths of these plates 20 to 22 are different, and the culm that forms the lower layer is longer.
One end of the leaf springs 20 to 22 is aligned at the same position, but the other end of each leaf spring extends laterally toward the lower layer.
The supporting piece 18 is brought into contact with the lower surface of the tip of the lowermost plate 22, and the plate spring 22 and the supporting piece 18 are connected by bolts 24. A channel 25 having a C-shaped cross section is fixed to the outer surface of the lifting platform 7 so as to surround the tip of the leaf spring 22 without contacting it, and a channel 25 having a C-shaped cross section is fixed to the outer surface of the lifting table 7. A limit switch 26 is installed as shown in FIG. When the contactor and the plate spring 22 are applied, the positional relationship is set such that the contact and the leaf spring 22 come into contact with each other.

FIG. 5 shows the connection state of the limit switches 26 provided on the four sensor units 17, respectively.

4 glue switches 26-a in each sensor unit 17
One end of ~26-d is grounded, and a lamp 27 and a buzzer 28, which are alarm devices, are connected to the other ends, respectively, and a horn 29 is connected to the lamp 27 and the buzzer 28. The lamp 27 and the buzzer 28 are installed inside the driver's cab 4, and are located at positions where the driver can easily perceive them.

The buzzer 28 also includes an excitation coil 30-R of the relay 30.
are connected in parallel, and a contact 30-r of this relay 30 is connected to a recorder 31.

FIG. 6 is a block diagram showing an example of the configuration of the recorder 31. The recorder 31 is constructed as follows.

That is, a storage device 33 for storing various information is connected to a control processing circuit 32 configured with a microcomputer system or the like. Similarly, the control processing circuit 32 includes the contact 30-r, an operation panel 34 for giving various commands, a timer 35 for giving real-time data, and a personal data input for inputting the personal data of the person who operated the elevator. Device 3
6 and a printer 37 as an output device that outputs necessary information are connected.

Recording device &33 is RAM, magnetic tape recording/reproducing device,
A magnetic disk device etc. can be applied. In the storage device 33,
It is now possible to memorize the time of overload, the operator's data when overload occurred, the recording start date, the cumulative number of overloads, the cumulative time of overload, the time when the cumulative total was cleared, etc. There is. If the personal data input device 36 is simple, it may be composed of a group of switches, for example, and each switch may be unique to each operator, but if it is complicated, For example, operator data may be written on a magnetic card and read.

Next, the operation of this embodiment will be explained.

First, an engine (not shown) attached to the vehicle body 1 is operated, and the engine drives a hydraulic mechanism to generate oil pressure. This oil pressure is supplied to a hydraulic cylinder (not shown) housed in the middle boom 10.

Therefore, the hydraulic cylinders housed in the middle boom 10 act to pull out the lower boom 11 and the upper boom 12 from the middle boom 10, and the elevating mechanism 6 is moved by the extension force of each hydraulic cylinder housed in each middle boom 10. Gradually widen the opening angle. Middle boom 10
The amount of extension of the lower boom 11 and the amount of extension of the middle boom 1 from
The amount by which the upper boom 12 extends from zero is controlled to be the same amount by a synchronization mechanism housed in the middle boom 10, and the lower boom 11 and the upper boom 12 extend by the same amount in synchronization. Therefore, the lifting mechanism 6 is always
While maintaining the shape of the letter, each connecting piece 14.1 is separated from the connecting shaft 13.
The distances up to 5 are always the same, and the platform 7 rises directly above and parallel to the vehicle body 1. Workers, materials, etc. are placed on this lifting platform 7 and are lifted by the lift.The total load of the workers, materials, etc.
and is deformed and supported by the elasticity of the leaf springs 20 to 22. If the load applied to this lifting platform 7 is within the appropriate limit range, each of the leaf springs 20 to 22 will deform, but the upper surface of the leaf spring 22 will not contact the limit switch 26, and each limit switch 26 will be deformed. is off, the lamp 27 and the buzzer 28 do not operate, and the excitation coil 30-R of the relay 30 is not excited, so the contact 3
0-r does not close. However, if the total load exceeds the limit, the amount of deformation of the leaf springs 20 to 22 will increase, and each limit switch 26 will be turned on by the leaf spring 22, operating the lamp 27 and buzzer 28, and turning on the relay 30. By energizing the excitation coil 30-R and closing the contact 30-r, it is notified that an overload is being applied to the lifting platform 7, and this information is input to the recorder 31. -12 deformation and damage can be prevented and recorded.

Next, the operation of the recorder 31 will be explained with reference to FIGS. 7 to 12.

FIG. 7 is a flowchart showing the recording and printing operations when an overload is detected by the sensor unit 17, and FIG. 8 is an explanatory diagram showing an example of printing in the operation shown in FIG. It is assumed that flag FT and registers RTI and RT2 are cleared.

First, the control processing circuit 32 determines whether the contact 30-r is on, and if it is off, nothing is done, and if it is on, the process moves to step 5101 (step 5100). If the flag FT is not set in step 5101, the process moves to step 5102, and if the flag FT is set, the process moves to step 5103. In this example, first the flag FTI
is not set, the process moves to step 5102, reads the time data (year, month, day, hour, and minute) of the timer 35, stores it in the register RTI, and sets the flag FT (
Step S102).

Next, the process moves to step 5104, and subtracts the time data of register RTI from the time data of register RT2, and if the difference data is less than 1 minute, for example, step S100
Returning to step 5105, if the time is longer than 1 minute, for example. Here, since the initial time is less than 1 minute, step S
100 and again in step 5100 contact 30-r
If it is determined that is on, the process moves to step 5101. In step S101, it is determined whether the flag FT is set, but since the flag FT is set this time, the process moves to step 5103.

In step 5103, the control processing circuit 32 controls the timer 3.
After writing the time data of 5 to the read register RT2, the process moves to step 5104.

After that, from the time data of register RT2, register RTI
Subtract the time data of , and the subtracted value is, for example, 1
If contact 30-r is on for less than 1 minute, step S
100→Step 5101→Step 5103 Step 5104-Step 5100 are repeated. Then, when, for example, one minute has elapsed in step 5104, the process moves to step 5105. In step 5105, contact 30-
Determine whether r is off, and if it is not off, step 51
The process moves to step 03, but if it is off, the process moves to step 8106. Thereafter, unless the contact 30-r is turned off, step 51 is performed.
05→Step 5103→Step S] and 04→Step 5105 are repeated.

When the contact 30-r is turned off in step 5105, the process moves to step 8106. At step 8106, the personal data of the operator is read, and the register RTI,
RT2 is read and written to a predetermined area of the storage device 33.

Next, flag FC is set (step S107),
In step 5108, the data in the predetermined area of the storage device 33 is sent to the printer 37 by the control processing circuit 32.
Print as shown. Next, the process moves to step 5109, where the registers RTI, RT2, and flag FT are cleared, and the series of processing ends. Note that if the contact point 30-r is not turned on in step 5100, the process moves to step S109. In Figure 8, “Mr. A” is “9 am
15:15 to 10:02 a.m." It is printed that the vehicle was overloaded.

FIG. 9 is a flowchart shown to explain the printing operation of the daily meter, and FIG. 1O is an explanatory diagram showing data printed according to the flowchart of FIG.

When a printing command is issued in step 5200 of FIG. 10, the number of overloads and the time thereof are accumulated for each operator in step S201, and the number of overloads and the time thereof are accumulated in step 5202. Add the cumulative value to the previous cumulative value in a predetermined area of the storage device 33,
In step S203, the results accumulated in step 3201 are printed as shown in FIG.

Next, in step 5204, the overload data for each operator is cleared. Note that the print command in step 5200 in FIG. 9 is normally issued from the timer 35 at midnight, but if the power is off at this time, printing will occur when the power is turned on later. Further, the printing command may be issued manually from the operation panel 34. In FIG. 10, "the date when the daily total was recorded", "the operator's name", "the cumulative number of overloads for each operator", and "the cumulative overload time" are printed.

FIG. 11 is a flow chart shown to explain the cumulative printing operation, and FIG. 12 is an explanatory diagram showing an example of printing performed by the operation shown in FIG. Operation panel 3 in step S 300
4 C button is pressed, and in step S301 operation panel 3 is pressed.
When it is confirmed that the F button 4 is not pressed, the time data of the timer 35 is read (step s30).
2), then add up today's unprocessed bones (step S
303). Next, the data accumulated in FIG. 9 is read from the storage device N33 and added to the value accumulated in step S303 (step 5304). Next, when printing is performed in step S305, printing as shown in FIG. 12 is performed. Then, in step 8306, flag FC is cleared.

On the other hand, when both the C button and F button on the operation panel 34 are on in steps 5300 and 5301, the time data is read from the timer 35 (step S 307), and it is confirmed that the flag FC indicating the end of cumulative printing is not set. (Step 3308) The time at which the cumulative total was cleared is printed (Step S309), and a predetermined area of the storage device for cumulative data is cleared (Step 5310). Furthermore, when the flag FC is set in step 8308, the cumulative total printing has not finished, so instead of immediately clearing the predetermined area of the storage device 33, an instruction to print the cumulative total is printed (step 8308). 5311), the series of processing ends.

In Figure 12, "Cumulative total", "Date and time when cumulative total was issued", "
"Date when cumulative totaling started", "Number of times overload occurred", and "Time when overload occurred" are printed respectively.

As mentioned above, the daily total for each operator is 1. Since the cumulative total is calculated,
Accurately keeping track of overload records will ensure safety management of booms, etc.

FIG. 13 shows another example of an integrated sensor structure used in the embodiment of the present invention, in which channels 50 and 51 each having a C-shaped cross section are fixed to the side and bottom surfaces of the lifting platform 7. A shaft support piece 52 is provided on the bottom surface of each channel 50.51.
．． 53 is fixed. A connecting piece 54 is rotatably connected to the shaft supporting piece 52 with a pin, and an arcuate plate spring 55 is installed between the shaft supporting piece 52 and the connecting piece 54 so as to be elastically deformable. Plate springs 56 and 57, which become shorter as they go lower, are in close contact with the lower surface of the spring 55, and temporary springs 55 to 57
and the support piece 18 are fixed with bolts 58. and,
A holding material 5 is placed on the lower surface of the lifting platform 7 between channels 5o and 51.
A limit switch 6o is attached to this holding member 59, and the contact of this limit switch 60 is positioned with an appropriate distance from the upper surface of the temporary spring 55. .

In this configuration, the load applied to the lifting platform 7 is
0.51 is transmitted to the leaf springs 55 to 57 via the connecting piece 54, and the leaf springs 55 to 57 are elastically deformed depending on the magnitude of the load, and when a load exceeding the limit is applied, the amount of deformation increases and the limit switch 60 can be turned on to generate an alarm.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the advantage that overload can be detected and recorded, overload can be accurately and properly grasped, and safety management of the elevating device can be reliably performed.

[Brief explanation of the drawing]

Fig. 1 is a side view of the elevating platform shown in an embodiment of the present invention when it is lowered; Fig. 2 is a side view of the elevating platform shown above when it is at its highest point; Fig. 3 is a rear view of the elevating platform shown above; Fig. 4 is a sectional view showing the internal structure of the sensor, Fig. 5 is an electric circuit diagram of the detection mechanism, Fig. 6 is a block diagram showing an example of the structure of the recorder, and Fig. 7 is a cross-sectional view showing the structure of the sensor integrated. 8 is an explanatory diagram showing an example of printing by the printing operation according to FIG. 7, FIG. 9 is a flowchart showing the operation of daily dial printing, and FIG. FIG. 11 is a flowchart showing the cumulative printing operation; FIG. 12 is an explanatory diagram showing an example of printing performed by the printing operation shown in FIG. 11; The figure is a sectional view showing another example of the integrated sensor used in the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vehicle body, 7... Lifting platform, 10... Middle boom, 17... Sensor integrated, 26... Limit switch, 30... Relay, 31... Recorder. Patent applicant: Hikoma Manufacturing agent: Patent attorney Hisashi Hibi
Figure 2 only Figure 3 Figure 8 Figure 9 Figure 10 Figure 12 Figure 13

Claims (1)

[Claims] A pair of internally hollow middle booms are rotatably connected in an X-shape approximately at the center of each, and an upper boom and a lower boom, which extend and retract at their respective ends, are slidably inserted into each middle boom. In a lifting device in which the tips of the booms are connected to a lifting platform at intervals, and the tips of the lower boom are connected to a base at intervals, a leaf spring is used to connect the upper end of the upper boom and the bottom of the platform. A detection switch is provided that is elastically connected and operates when the leaf spring is deformed by load on either side of the upper boom and the lifting platform.
A recording means is provided which can take in operation information from the detection switch and record and output at least the activation time and number of activations of the detection switch for each operator when the detection switch is activated continuously for a predetermined period of time or more. A load detection and recording device for a lifting device, characterized by: