JP2002090248A - Measuring apparatus for gas pressure of gas spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring apparatus by which the gas pressure of a gas spring is measured precisely, which issues a warning when the measured gas pressure is less than a tolerance lower-limit value and which stops the operation of an apparatus such as a pressing machine or the like. SOLUTION: The measuring apparatus 1 for the gas pressure of the gas spring is provided with an input means 18 by which the set optimum pressure value of the optimum gas pressure of the gas spring and the tolerance lower- limit value of the gas pressure of the gas spring are digitally input, a pressure sensor 20 which senses the gas pressure of the gas spring 5, a display means 17 by which the set value of the tolerance lower-limit gas pressure of the gas spring and a pressure value corresponding to the gas pressure from the pressure sensor 20 are digitally displayed, a warning means 16 by which the gas-pressure sensed value sensed by the pressure sensor 20 is compared with the tolerance lower-limit value and which judges that the gas pressure of the gas spring 5 is abnormal so as to issue the warning when the gaspressure sensed value sensed by the pressure sensor 70 is less than the tolerance lower-limit value and a controller 21 which stops the operation of the apparatus using the gas spring 5 when the gas pressure of the gas spring 5 is abnormal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas spring gas pressure measuring device capable of setting and measuring a gas pressure of a gas spring in a digital value.

[0002]

2. Description of the Related Art Gas springs are used, for example, as cushions for press machines for press-working the body of automobiles, and, like coil springs, are used to reduce the impact force by using gas pressure or to hold down a work. ing. Here, a case where the body of an automobile is used as a cushion material of a press machine for press working will be described as an example. A gas such as nitrogen is sealed in such a gas spring, but if the sealed gas escapes for any reason, the gas pressure decreases and a sufficient pressing force cannot be obtained or as a cushion material. Cannot be exhibited, a defective product may be generated, or the mold of the press machine may be damaged if the gas pressure is significantly reduced. Therefore, in order to protect the press machine, it is necessary to constantly measure the gas pressure of the gas spring and monitor whether or not the gas pressure is maintained at an appropriate value. Conventionally, an analog gas pressure measuring device has been used for measuring the gas pressure of such a gas spring.

[0003]

In such an analog type gas pressure measuring device, a monitoring person reads the gas pressure from a scale displayed on the measuring device. When a reading error occurs, particularly when the scale is not fine, the reading error becomes large and there is a state where a correct gas pressure cannot be read. For this reason, it may be determined that the gas pressure of the gas spring is not abnormal but abnormal, or that the gas pressure of the gas spring is abnormal but not abnormal. Furthermore, it is difficult to accurately measure the gas pressure of the gas spring with the analog type, so that the accuracy is lacking. Therefore, there is a risk that the determination as to whether or not the gas pressure is abnormal may not be made properly.

Further, since the press machine is not linked with the gas pressure measuring device of the gas spring, even if the gas pressure is abnormal, the press machine continues to operate without stopping, and this is a defective product. This is a cause of continuing production and causing breakage of the press machine mold.

[0005] Further, when cleaning the mold of the press machine, the cleaning solution is applied to the gas pressure measuring device of the gas spring provided near the mold of the press machine in order to wash the entire mold with the cleaning solution. There are many. When the cleaning liquid is applied to the gas pressure measuring device, the cleaning liquid may enter the gas pressure measuring device, causing a failure.

An object of the present invention is to accurately measure the gas pressure of a gas spring, and when a measured gas pressure falls below an allowable lower limit, a warning is issued and the operation of a device such as a press machine is started. It is an object of the present invention to provide a gas pressure measuring device for a gas spring which can stop the gas pressure.

Another object of the present invention is to provide a digital gas pressure measuring apparatus which can maintain water resistance even when a cleaning liquid is applied to the entire mold when the mold of the press machine is washed. .

[0008]

In order to achieve one object of the present invention, a gas spring gas pressure measuring device according to claim 1 detects a gas pressure of a gas spring and detects the gas pressure value. A gas pressure measuring device for a gas spring to be displayed, wherein input means for digitally inputting a setting optimum pressure value of the gas spring and an allowable lower limit value of the gas pressure of the gas spring, and a gas pressure of the gas spring. A pressure sensor that introduces and outputs an electric signal corresponding to the gas pressure, an allowable lower limit value of the gas pressure input from the input means, a display means for digitally displaying the pressure value corresponding to the gas pressure from the pressure sensor, and a pressure. The gas pressure detection value detected by the sensor is compared with the set lower limit, and when the gas pressure detected value detected by the pressure sensor falls below the set lower limit, the gas Warning means for determining that the gas pressure of the gas spring is abnormal and issuing a warning, and a control device for stopping the operation of the device using the gas spring when the gas pressure of the gas spring is abnormal. is there.
With this configuration, according to the first aspect of the invention, it is possible to accurately measure the gas pressure of the gas spring, and when the measured gas pressure falls below the allowable lower limit,
A warning can be issued and the operation of the device such as the press machine can be stopped.

In order to achieve one object of the present application,
The gas pressure measuring device for a gas spring according to claim 2,
The allowable lower limit is calculated from the set optimum pressure value.

According to the second aspect of the present invention, the gas pressure of the gas spring can be accurately measured. If the measured gas pressure falls below the allowable lower limit, a warning is issued. Then, the operation of the device such as the press machine can be stopped.

In order to achieve one object of the present invention,
The gas pressure measuring device for a gas spring according to claim 3,
The control device is driven when an abnormality in the gas pressure of the gas spring is detected three times at predetermined time intervals. With this configuration, according to the third aspect of the invention, although the gas pressure of the gas spring is not abnormal, the detected value may temporarily show an abnormal value for some reason, and in such a case, immediately Without stopping the operation of equipment such as a press machine, it judges whether the abnormal value of the gas pressure of the gas spring is temporary or not, and temporarily detects the gas pressure of the gas spring for some reason even if it is not abnormal When the value becomes an abnormal value, it is not necessary to stop the operation of the device such as the press machine, so that the operation efficiency of the device such as the press machine can be improved.

In order to achieve one object of the present application,
The gas pressure measuring device for a gas spring according to claim 4,
The control device is driven when an abnormality in the gas pressure of the gas spring is continuously detected for a predetermined time. With this configuration, according to the fourth aspect of the invention, the detected value may temporarily show an abnormal value for some reason even though the gas pressure of the gas spring is not abnormal. Without stopping the operation of equipment such as a press machine, it judges whether the abnormal value of the gas pressure of the gas spring is temporary or not, and temporarily detects the gas pressure of the gas spring for some reason even if it is not abnormal When the value becomes an abnormal value, it is not necessary to stop the operation of the device such as the press machine, so that the operation efficiency of the device such as the press machine can be improved.

[0013] In order to achieve one object of the present application,
The gas pressure measuring device for a gas spring according to claim 5,
The gas pressure measuring device of the gas spring is provided with a filling port for filling the gas to be filled in the gas spring, so that the gas spring can be filled with the gas. It is configured so that pressure can be displayed. With this configuration, according to the invention described in claim 5, the gas pressure filled in the gas spring can be constantly maintained at a constant level.

According to another aspect of the present invention, there is provided an apparatus for measuring gas pressure of a gas spring, comprising a box-shaped housing and a lid covering the housing. A gas pressure measuring device of a gas spring is housed in a container provided with a waterproof member between the housing and the lid. With this configuration, according to the invention as set forth in claim 6, it is possible to maintain the water resistance even when washing the mold of the press machine by applying a washing liquid to the entire mold.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas spring gas pressure measuring device according to the present invention will be described below. In the following, the set optimal pressure value is the value of the optimal gas pressure of the gas spring, and the permissible lower limit value is the value of the gas pressure at which the gas pressure of the gas spring is considered to be abnormal if it falls below that value. Value.

FIG. 1 shows a first embodiment of a gas spring gas pressure measuring device according to the present invention. An analog gas pressure measuring device 3 is connected to the gas pressure measuring device 1 of the gas spring through a pipe 2 which is a gas flow path.
Is connected, and this analog type gas pressure measuring device 3
Is connected to a gas spring 5 via a pipe 4. In addition, this analog type gas pressure measuring device 3 includes:
A filling port 6 used when filling the gas into the gas spring 5 is provided.

FIGS. 2 and 3 show details of the gas spring gas pressure measuring device 1 shown in FIG. That is, the gas pressure measuring device 1 of the gas spring has a box shape and is constituted by a housing 11 and a lid 12, and the lid 12 is provided at four corners thereof as shown in FIG. 11 is screwed with screws 13A to 13D. Also,
The casing 2 is connected to a pipe 2 serving as a gas flow path. The pipe 2 is connected to a pressure sensor, which will be described later, which constitutes the gas pressure measuring device 1 for a gas spring. The gas pressure of the gas spring 5 is transmitted to the pressure sensor through the pipe 2.

A power cable 14 is connected near the connection point of the pipe 2 on the same plane as the connection point of the pipe 2. The cover 12 is provided with a window 15, and the window 15 is formed of a transparent member. This window 1
5, the warning lamp 16 (normal lamp 16a, abnormal lamp 16b, forced lamp 16c) and the display means 17 can be seen. Further, on the surface of the lid 12, the set optimal pressure value (initial designated pressure in the figure) and the allowable lower limit value (the pressure monitor operating pressure in the figure) of the gas pressure of the gas spring 5 determined by the location of use and the gas spring 5
The operator can describe the value of the maximum filling pressure, which is the maximum gas pressure that can be charged into the tank. Therefore, by describing the values of the set optimum pressure value, the allowable lower limit value, and the maximum filling pressure according to each location where the gas spring 5 is used, the operator can know each numerical value at that location. It has become.

FIG. 3 is a view showing the gas spring gas pressure measuring device 1 with the lid 12 opened. In the figure, a warning lamp 16 (normal lamp 16a, abnormal lamp 1) forming a part of a gas pressure measuring device 1 of a gas spring.
6b, forced lamp 16c), display means 17, and input means 1
A button 18A and a button 18B forming the button 8 are shown.

FIG. 4 shows a block diagram of the gas pressure measuring device 1 for a gas spring. In FIG. 1, the gas pressure measuring device 1 for a gas spring includes an input unit 18, a pressure sensor 20, a display unit 17, a warning lamp 16, and a control device 21. The warning lamp 16 and the control device 21 form a warning means.
In addition, an AC / DC converter 24, a rechargeable battery 25, a power outlet 28, and a changeover switch 26 for switching between obtaining power from an AC power source and power from a rechargeable battery are provided. In addition,
As will be described later, a switch 2 for switching between setting an allowable lower limit value and an allowable upper limit value with the input means 18.
7 may be provided.

The control device 21 includes an input / output device 51 and a CPU.
52, a ROM 53, and a RAM 54.
The control device 21 controls to stop the operation of a device such as a press using the gas spring 5 when the gas pressure of the gas spring 5 is abnormal. Details will be described later. It should be noted that the CP constituting the control device 21
In U52, the operation of the device such as the press machine is not immediately stopped when the gas pressure abnormality of the gas spring 5 is detected, but a predetermined time has passed since the gas pressure abnormality of the gas spring 5 was detected. A timer may be provided so that the control device 21 is driven to stop a device such as a press machine later. In addition, when an abnormality of the gas pressure of the gas spring 5 is detected, instead of immediately stopping the operation of the device such as the press machine when the abnormality of the gas pressure of the gas spring 5 is detected three times every predetermined time, The CPU 5 is controlled so that the control device 21 is driven to stop the operation of a device such as a press machine.
2, a counter may be provided in addition to the timer. Here, the predetermined time may be any length of time as long as it is a time between each press in an apparatus such as a press machine.

The input / output device 51, the display means 17, the ROM 53, and the RAM 54 are connected to the CPU 52 by a bus line 55.
(A to d), and a changeover switch 26 for switching between obtaining power from an AC power supply and obtaining power from a DC rechargeable battery 25 is connected by a lead wire 56a. An AC / DC converter 24 and a rechargeable battery 25 are connected to the switch
6b and the lead wire 56c. Further AC
A power outlet 28 is connected to the / DC converter 24.

Input / output device 5 connected to CPU 52
1 includes an input means 18, a pressure sensor 20, and a warning lamp 1.
6 are connected by a lead wire 56d, a lead wire 56e, and a lead wire 56f, respectively. The input / output device 51 further includes a switch 27 and a main switch 28 provided in a device such as a press for operating or stopping the device such as a press.
And are connected by.

The input means 18 has a button 18A and a button 18B as shown in FIGS. 2 and 3, and digitally inputs a set optimum pressure value and an allowable lower limit value using these buttons. ing. The setting method will be described later.

The pressure sensor 20 is connected to a pipe 2 serving as a gas flow path, so that the gas pressure of the gas spring 5 can be introduced. Then, the introduced pressure is output to the input / output device 51 as an electric signal.

The display means 17 is a liquid crystal display, and the allowable lower limit value and the pressure value of the gas spring 5 are digitally displayed. Since the display means 17 has a backlight, the pressure value can be recognized even at night. As shown in FIG. 2 or FIG. 3, characters “SET” and “DIFF” are written in a vertical line immediately next to the display means 17.

As shown in FIGS. 2 and 3, the warning lamp 16 includes a normal lamp 16a, an abnormal lamp 16b, and a forced lamp 16c. The normal lamp 16a, the abnormal lamp 16b, and the forced lamp 16c are arranged in a line in order from the left side in FIG. The normal lamp 16a is lit when the gas pressure is normal, and in this embodiment, is lit green. The abnormal lamp 16b is lit when the gas pressure falls below the permissible lower limit, and illuminates red in the present embodiment. However, the abnormality lamp 16b is turned on when the gas pressure value exceeds the allowable upper limit value described later when an abnormality is detected when the gas pressure of the gas spring 5 increases as described later. .

The forcible lamp 16c is turned on by a forcible switch 19 provided on the right side of the forcible lamp 16c in FIG.
When N is set, the LED lights in orange. The forcible switch 19 determines that the gas pressure of the gas spring 5 is normal, but the gas pressure of the gas spring 5 is abnormal for some reason, and the control device 21 operates the press machine or the like as described later. When the operation is stopped, the switch is turned on so that the operation can be continued.

The warning lamp 16 is a normal lamp 16a.
A warning lamp may be provided in addition to the abnormal lamp 16b and the forced lamp 16c. Although this warning lamp has not reached the allowable lower limit value which is regarded as abnormal, it is turned on when approaching the value.

The gas pressure measuring device 1 for a gas spring according to the present invention can obtain power from an AC power source at a power outlet 28, but can also obtain power from a rechargeable battery 25. The changeover switch 26 obtains electric power from an AC power supply or rechargeable battery 2.
5 to switch whether to obtain power. Since the gas pressure measuring device 1 of the gas spring operates with a direct current, when the electric power is obtained from the AC power source through the power outlet 28, the AC / DC converter 24 converts the alternating current into the direct current.

Next, a method of setting the set optimum pressure value and the allowable lower limit value of the gas spring gas pressure measuring device 1 configured as described above will be described. In setting,
Remove the lid 11 from the housing 12. The input of the set optimum pressure value is performed as follows. First, the button 18A is pressed for a few seconds, and when the word “SET” flashes on the display, the button 18A is released. Then, the cursor blinks at the SET placed beside the display means 17 and a three-digit number is displayed. Next, when the button 18A is pressed again, the first digit (hundreds digit) flashes. Button 18
Press B to enter a number. After inputting the first digit, press button 18A to enter the next digit (tens place).
Is moved to and the button 18B is pressed to input a numerical value. When the input of the numerical value is completed, the button 18A is pressed to move the blinking to the next digit (one digit), and the numerical value is input by pressing the button 18B. When the input of the numerical value is completed, the button 18A is pressed to terminate the input of the set optimum pressure value, and then the process proceeds to the setting of the allowable lower limit. The permissible lower limit is set by inputting a difference from the set optimum pressure value, that is, a differential pressure value. For example,
When it is desired to set the allowable lower limit to 80 kgf / cm ² , input the set optimum pressure value as 90 and input 10 as the differential pressure value. A specific method of setting the differential pressure value is as follows. First, when the button 18B is pressed, the cursor blinking in SET at the time when the input of the set optimum pressure value is completed is changed to the DIF below it.
Move to F. Next, the user presses the button 18A to input a numerical value in the same manner as the set optimum pressure value. When the input of the differential pressure value is completed, the button 18A is held down for several seconds, and when "prs" is displayed on the display, the button 18A is released. The setting is completed as described above. After the setting is completed, the lid 12 is attached to the housing 11 again. In the present embodiment, assuming that the gas pressure decreases, only the allowable lower limit is set as the gas pressure recognized as abnormal, but the present invention is not necessarily limited to such a case. An allowable upper limit value may be set to detect an abnormality when the gas pressure increases. Here, the allowable upper limit is
When the gas pressure rises above that value, it means the value of the gas pressure that is recognized as abnormal. Further, both the allowable lower limit value and the allowable upper limit value may be set. In this case, it is possible to detect abnormalities in both the gas pressure when the gas pressure of the gas spring 5 decreases and when the gas pressure increases. Even when both the allowable upper limit and the allowable lower limit can be set, only when the gas pressure of the gas spring 5 falls below the allowable lower limit or only when the gas pressure exceeds the allowable upper limit. In one case, an abnormality may be detected. In this case, the switch 27 switches which abnormality is detected.

Further, only the set optimum pressure value may be inputted. In this case, the permissible lower limit value and the permissible upper limit value are obtained by calculating from the input set optimum pressure value. For example, if the programmed lower limit is set to a value that is reduced by 20% from the set optimum pressure value and the upper limit is set to a value increased by 20%, the set lower limit is set to 100 when the set optimum pressure value is set to 100. The value is 80, and the allowable upper limit is 120.

The allowable lower limit value and the allowable upper limit value thus input are input to the CPU 52 via the input / output device 51 as electric signals. The calculation is performed by the ROM 53, and the numerical value obtained as a result of the calculation is stored in the RA via the CPU 52.
It is stored in M54.

Next, a gas pressure measuring device 1 for a gas spring
The operation at the time of detecting an abnormal gas pressure will be described. First, an electric signal proportional to the gas pressure is output to the CPU 52 via the input / output device 51 by the pressure sensor 20. CPU5
2 causes the ROM 53 to calculate the input electric signal, displays the gas pressure value obtained as a result of the calculation on the display means 17, and compares the gas pressure value with the allowable lower limit value stored in the RAM 54, thereby causing the gas pressure to be abnormal. Is determined. C
The PU 52 outputs an electric signal for turning on the normal lamp 16a when the gas pressure exceeds the allowable lower limit value.
1 to the normal lamp 16a,
a is turned on. On the other hand, when the gas pressure falls below the lower limit, an electric signal for turning on the abnormal lamp 16b is output to the abnormal lamp 16b via the input / output device 51 to turn on the abnormal lamp 16b, and the input / output device 51 is turned on. Then, a stop signal is output to the main switch 28 to stop the operation of a device such as a press machine.

If the allowable upper limit value is set instead of the allowable lower limit value, the CPU 52
0 from the input / output device 51 to R
The value of the gas pressure obtained by making the OM 53 calculate is compared with the allowable upper limit value stored in the RAM 54. If the gas pressure is lower than the allowable upper limit value, the normal lamp 16a
Is output to the normal lamp 16a via the input / output device 51 to turn on the normal lamp 16a.
On the other hand, when the gas pressure exceeds the allowable upper limit, an electric signal for turning on the abnormal lamp 16b is output to the abnormal lamp 16b via the input / output device 51 to turn on the abnormal lamp 16b and to enter the main switch 28. Output device 51
A stop signal of the press machine or the like is output via the CPU to stop the operation of the device such as the press machine.

In the case where both the allowable lower limit value and the allowable upper limit value are set, both the abnormalities when the gas pressure of the gas spring 5 falls below the allowable lower limit value and when the gas pressure exceeds the allowable upper limit value are determined. Is detected, the CP
U <b> 52 compares the gas pressure value obtained by causing the ROM 53 to calculate an electric signal input from the pressure sensor 20 via the input / output device 51 and the allowable lower limit value and the allowable upper limit value stored in the RAM 54. If the gas pressure is higher than the allowable lower limit and lower than the allowable upper limit, the CPU 52 outputs an electric signal for turning on the normal lamp 16a to the normal lamp 16a via the input / output device 51, The normal lamp 16a is turned on. On the other hand, when the gas pressure value falls below the allowable lower limit value or exceeds the allowable upper limit value, the CPU 52 sends an electric signal for turning on the abnormal lamp 16 b via the input / output device 51 to the abnormal lamp 16.
b to turn on the abnormal lamp 16b,
A stop signal for a device such as a press is output to the main switch 28 via the input / output device 51 to stop the operation of the device such as the press.

Even when both the allowable lower limit value and the allowable upper limit value are set, the detection of one of the abnormalities when the value falls below the allowable lower limit value or exceeds the allowable upper limit value is detected. The operation of the abnormality detection in the case where it is performed is the same as the case where only the allowable lower limit value or only the allowable upper limit value is set.

As described above, when the gas pressure of the gas spring falls below the allowable lower limit or exceeds the allowable upper limit, that is, when the gas pressure of the gas spring 5 becomes abnormal, an abnormal state is determined. The operation of a device such as a press machine may be stopped when the time has continued. In this case, the CPU 52 does not immediately output a stop signal of a device such as a press machine when an abnormality in the gas pressure of the gas spring 5 is detected, but a timer provided in the CPU 52 uses a predetermined time programmed in advance. Measure,
If abnormal gas pressure continues during that time, CP
U52 outputs a stop signal of a device such as a press machine to the main switch 28 via the input / output device 51.

In addition, when the abnormality of the gas spring 5 is detected, the operation of the press machine or the like is not stopped immediately when the abnormality of the gas spring 5 is detected. May be stopped. In this case, a timer provided in the CPU 52 measures a pre-programmed predetermined time, and the CPU 52 compares the gas pressure value with the pressure lower limit value and the pressure upper limit value at each of the predetermined time intervals. When the detection is performed three times (when the pressure falls below the lower limit of the pressure or when the pressure exceeds the upper limit of the pressure), a stop signal of a device such as a press is output to the main switch 28 via the input / output device 51.

As described above, since the gas pressure measuring device 1 for a gas spring according to the present invention measures the gas pressure of the gas spring 5 by a digital method, it is possible to accurately measure the gas pressure and detect an abnormal gas pressure. it can. Further, the gas pressure is digitally displayed on the display means 17 and a warning lamp 16 is provided.
Since the colors of the normal lamp 16a and the abnormal lamp 16b are different from each other, it can be seen at a glance whether the gas pressure of the gas spring 5 is normal or abnormal. further,
When the gas pressure becomes abnormal, the control device 21 stops the operation of the device such as the press machine, so that there is no occurrence of defective products or damage to the mold of the press machine.

When an abnormality in the gas pressure of the gas spring 5 is detected, the control device 21 is not driven immediately to stop the operation of a device such as a press machine, but is detected three times at predetermined time intervals. If you decide to drive,
When the drive is performed after a predetermined time has passed since the detection of the gas pressure abnormality, it is determined whether or not the abnormality of the detected gas pressure of the gas spring 5 is temporary. It is possible to improve the operating efficiency of the press machine and other devices because it is not necessary to stop the operation of the press machine and the like when the detected value temporarily becomes an abnormal value for some reason even if the device is not abnormal. it can.

Further, a gas pressure measuring device 1 for a gas spring
Is provided with a rechargeable battery 25, so that the gas pressure can be measured by the gas pressure measuring device 1 of the gas spring using the rechargeable battery even in a place where there is no power supply.

In the case where a warning lamp is provided as the display means 17, the warning can be detected before the gas pressure of the gas spring 5 reaches the allowable lower limit value. The operation of the device such as the press machine can be stopped, and the risk of occurrence of defective products and damage to the mold of the press machine is reduced.

FIG. 5 shows the appearance of a gas spring gas pressure measuring apparatus according to a second embodiment of the present invention. The gas pressure measuring device 30 of the gas spring according to the second embodiment
The gas pressure measuring device 1 of the gas spring according to the first embodiment is provided with a gas filling port 6 provided in an analog gas pressure measuring device 3. FIG. 6 is a view showing a state where the lid 12 is opened.

This gas spring gas pressure measuring device 30
Is connected to the gas spring 5 via a pipe. FIG. 7 shows such a connection state.

Hereinafter, referring to FIG. 5 and FIG.
Will be described. The filling port 6 has a cylindrical shape, and is connected to the pipe 2 so as to be orthogonal to the axial direction of the pipe 2 which is a gas flow path. The gas can be filled into the gas spring 5 from the filling port 6 through the pipe 2. During the gas filling from the filling port 6 to the gas spring 5, the filling gas pressure can be displayed on the display means 17.

As described above, since the gas filling port 6 is provided in the gas pressure measuring device 30 itself of the gas spring, the gas filling port 6 is provided.
The gas pressure in the gas spring 5 can be kept constant, and the gas pressure measuring device 3 provided with the charging port 6 can be maintained.
Becomes unnecessary. In addition, even if the gas is filled from the filling port 6, if the gas pressure decreases earlier than usual and the abnormality falls below the allowable lower limit and an abnormality occurs, for example, a crack is generated at any part. There is a high possibility that a failure has occurred, and an inspection can be performed immediately to find an abnormal portion, and there is no occurrence of defective products or damage to the press machine mold.

Next, a third embodiment of the gas spring gas pressure measuring device according to the present invention will be described with reference to FIG. FIG. 8 is a view showing a gas spring gas pressure measuring device 32 in which a packing 31 is provided in the gas pressure measuring device 1 shown in FIG. The packing 31 is made of rubber, is provided on the upper surface of the peripheral wall of the housing 11 of the gas pressure measuring device 32 of a gas spring, and seals the space between the gasket 31 and the lid 12. The packing 31 is not limited to rubber. Although not shown, the gas spring gas pressure measuring device 30 shown in FIG. 6 may be provided with a packing 31.

Since the packing 31 is provided as a waterproof member as described above, water resistance can be maintained even if the cleaning liquid is applied to the gas pressure measuring device 32 of the gas spring when cleaning the mold of the press machine.

[0050]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, it is possible to accurately measure the gas pressure of the gas spring. If the measured gas pressure falls below the allowable lower limit, a warning is issued and a press machine or the like is used. The operation of the device can be stopped.

According to the second aspect of the present invention, the gas pressure of the gas spring can be accurately measured, and when the measured gas pressure falls below the allowable lower limit, a warning is issued and a press machine or the like is used. The operation of the device can be stopped.

According to the third aspect of the present invention, although the gas pressure of the gas spring is not abnormal, the detected value may temporarily show an abnormal value for some reason.
Immediately stop the operation of equipment such as a press machine and judge whether the detected value of the gas pressure of the gas spring is temporary or not. When the detected value becomes an abnormal value, it is not necessary to stop the operation of the device such as the press machine, so that the operation efficiency of the device such as the press machine can be improved.

According to the fourth aspect of the invention, the detected value may temporarily show an abnormal value for some reason although the gas pressure of the gas spring is not abnormal.
Immediately stop the operation of equipment such as a press machine and judge whether the detected value of the gas pressure of the gas spring is temporary or not. When the detected value becomes an abnormal value, it is not necessary to stop the operation of the device such as the press machine, so that the operation efficiency of the device such as the press machine can be improved.

According to the fifth aspect of the present invention, the gas pressure filled in the gas spring can be constantly maintained.

According to the invention described in claim 6, the water resistance can be maintained even when the mold of the press machine is washed by applying a cleaning liquid to the entire mold.

[Brief description of the drawings]

FIG. 1 is a view showing the appearance of a gas pressure measuring device for a gas spring according to the present invention.

FIG. 2 is a view showing a state in which a lid of the gas pressure measuring device for a gas spring according to the present invention is removed.

FIG. 3 is a diagram showing how a gas pressure measuring device for a gas spring according to the present invention is connected.

FIG. 4 is a block diagram of a gas pressure measuring device for a gas spring according to the present invention.

FIG. 5 is a view showing another embodiment of the gas pressure measuring device for a gas spring according to the present invention.

FIG. 6 is a view showing a gas spring gas pressure measuring apparatus according to another embodiment of the present invention in a state where a lid is removed.

FIG. 7 is a diagram showing another embodiment of the gas pressure measuring device for a gas spring according to the present invention and connection with the gas spring.

FIG. 8 is a partially cutaway side view of FIG. 6;

[Explanation of symbols]

 1 gas pressure measuring device for gas spring 5 gas spring 6 gas filling port 11 filling port 11 … Case 12 ………………… Lid 16 ……………… Warning lamp 17 ………………………………………………………………………………… Indication 18 Means 20 ...... Pressure sensor 21 ...... Control device 31 ...... Packing

Claims (6)

[Claims] 1. A gas spring gas pressure measuring device for detecting a gas pressure of a gas spring and displaying the gas pressure value, wherein an optimum gas pressure setting of the gas spring and an optimum gas pressure of the gas spring are provided. Input means for digitally inputting an allowable lower limit of the gas pressure of the gas pressure, a pressure sensor for introducing the gas pressure of the gas spring, and outputting an electric signal corresponding to the gas pressure, and the gas input from the input means. An allowable lower limit value of the pressure, a display means for digitally displaying a pressure value corresponding to the gas pressure from the pressure sensor, and comparing the gas pressure detection value detected by the pressure sensor with the set allowable lower limit value, Warning means for determining that the gas pressure of the gas spring is abnormal when a gas pressure detection value detected by the pressure sensor falls below the set allowable lower limit value and issuing a warning. A control unit for stopping the operation of the device being used in the gas spring when the abnormality of the gas pressure of the gas spring,
A gas pressure measuring device for a gas spring, comprising: 2. The gas pressure measuring device for a gas spring according to claim 1, wherein the allowable lower limit value is calculated from the set optimum pressure value. 3. The gas pressure measuring device for a gas spring according to claim 1, wherein the control device is driven when an abnormal gas pressure of the gas spring is detected three times at predetermined time intervals. 4. The gas spring gas pressure measuring device according to claim 1, wherein the control device is driven when abnormality of the gas pressure of the gas spring is continuously detected for a predetermined time. 5. The gas pressure measuring device for a gas spring according to claim 1, further comprising a filling port for filling a gas to be filled in the gas spring so that the gas spring can be filled with the gas. 4. A gas pressure measuring device for a gas spring according to claim 1, wherein the gas pressure is displayed on the display means during gas filling. 6. The gas pressure measuring device for a gas spring comprises a box-shaped housing and a lid covering the housing, and a waterproof member is provided between the housing and the lid. 5. The gas pressure measuring device for a gas spring according to claim 1, wherein the gas pressure measuring device is housed in a container provided.