JP2014201215A - Tire air filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire air filling device which can notify that standby time for safety elapses after measured pressure reaches set filling pressure and improve convenience for work for filling the tire with air.SOLUTION: The tire air filling device comprises: a compressed air generating portion 2 for generating compressed air; a supply piping portion 3 that connects the compressed air generating portion 2 to a tire W and supplies the compressed air generated by the compressed air generating portion 2 to the tire W; a pressure measurement portion 4 for measuring air pressure in the supply piping portion 3; a filling pressure setting portion 5 for setting filling pressure Pb to be filled into the tire W; an acoustic alarm portion 6 capable of generating alarm sound; and a control portion 7 that when measured pressure Pm reaches the filling pressure Pb, starts time counting and when the counted time clocks predetermined time T1 to confirm a filling state, directs the acoustic alarm portion 6 to generate alarm sound.

Description

  The present invention relates to a tire air filling apparatus that can fill a tire of an automobile with air to a predetermined filling pressure.

  Conventionally, for example, a tire air filling apparatus disclosed in Patent Document 1 is used in gas stations and automobile maintenance shops. This conventional tire air filling apparatus includes a pressure sensor, a filling solenoid valve, an air compressor, an air hose, an exhaust solenoid valve, and an open air chuck valve.

  The pressure sensor, the filling solenoid valve, and the exhaust solenoid valve are connected to a controller, and the controller opens and closes the filling solenoid valve and the exhaust solenoid valve in response to a signal from the pressure sensor.

  The air filling pressure of the tire by such a tire air filling device is set to 800 kPa, for example, and after the pressure measured by the pressure sensor becomes the filling pressure, for safety, for example, waiting for 5 minutes, After confirming that there is no rupture of the tire, the nozzle of the air hose is removed from the tire. The waiting time (for example, 5 minutes) is defined by the Industrial Safety and Health Law.

JP 2003-335114 A

  In the prior art, an operator must time and determine whether or not a waiting time for safety has elapsed since the measured pressure of air on the tire has reached a preset filling pressure. Therefore, until the standby time elapses, there is a problem that the operator's work is limited and the convenience is low.

  An object of the present invention is to provide a tire air filling device capable of notifying that a waiting time for safety has elapsed after the measurement pressure reaches a set filling pressure and improving the convenience of air filling work on the tire. Is to provide.

The present invention includes a compressed air generator that generates compressed air;
Connecting the compressed air generating unit and the tire, and supplying the compressed air generated in the compressed air generating unit to the tire;
A pressure measuring unit for measuring the pressure of air in the supply piping unit;
A filling pressure setting unit for setting a filling pressure of air filled in the tire;
An acoustic notification unit capable of generating a notification sound;
Control that starts a time measuring operation when the measured pressure measured by the pressure measuring unit reaches the filling pressure, and causes the sound notification unit to generate a notification sound when a predetermined filling state confirmation time is counted. A tire air filling device.

  According to the present invention, the control unit is configured such that a differential pressure between the measured pressure and the filling pressure when the time keeping time measures the predetermined filling state confirmation time is equal to or higher than a predetermined first pressure, and When the pressure is equal to or lower than a predetermined second pressure higher than 1 pressure, compressed air is generated in the compressed air generator.

  Further, the present invention is characterized in that the predetermined filling state confirmation time is set to a time shorter than a safety confirmation time after completion of filling the tire with air.

  According to the present invention, the compressed air generation unit and the tire are connected by the supply piping unit, and the compressed air generated in the compressed air generation unit is supplied to the tire through the supply piping unit. The pressure of the air in the supply piping unit is measured by the pressure measurement unit. The filling pressure of the air filled in the tire is set by a filling pressure setting unit. The control unit starts a time measuring operation when the measured pressure measured by the pressure measuring unit reaches the filling pressure, and causes the sound notification unit to generate a notification sound when a time for measuring a predetermined filling state is measured. . In this way, it is possible to notify the operator that the waiting time for safety confirmation has elapsed since the measured pressure has reached the set filling pressure. This eliminates the need for the operator to time the waiting time for safety confirmation as in the prior art, and prevents the trouble that the worker's work is limited until the waiting time elapses. The convenience of the air filling operation can be improved.

  Further, according to the present invention, the control unit is configured such that the differential pressure between the measured pressure and the filling pressure when the time measurement time is set to the predetermined filling state confirmation time is equal to or higher than the predetermined first pressure and from the first pressure. When the air pressure is higher than the predetermined second pressure, compressed air is generated in the compressed air generating section, so that the tire is supplemented with air and the tire air pressure is reliably filled to the set filling pressure. can do.

  Further, according to the present invention, the predetermined filling state confirmation time is set to a time shorter than the safety confirmation time after completion of air filling the tire, so the tire state confirmation is performed immediately before the safety confirmation time elapses.・ If there is no abnormality after handling the status, the safety confirmation time has passed, and if there is an abnormality, the abnormality can be addressed before the safety confirmation time has elapsed. Thus, the air filling operation into the tire can be facilitated.

It is a block diagram showing the basic composition of tire air filling device 1 of one embodiment of the present invention. 1 is a perspective view showing an appearance of a tire air filling device 1. 3 is a front view showing an operation panel 14a of the operation head 14. FIG. 3 is a flowchart for explaining the operation of the tire air filling device 1;

  FIG. 1 is a block diagram showing a basic configuration of a tire air filling device 1 according to an embodiment of the present invention. In the present embodiment, as shown in FIGS. 2 and 3 to be described later, a tire air filling device 1 having a single system configuration including one air filling hose 15 will be described.

  The tire air filling device 1 connects a compressed air generating section 2 that generates compressed air, the compressed air generating section 2 and the tire W, and supplies the compressed air generated by the compressed air generating section 2 to the tire W. A supply piping unit 3, a pressure measurement unit 4 for measuring the pressure of air in the supply piping unit 3, a filling pressure setting unit 5 for setting a filling pressure Pb of air filled in the tire W, When the measurement pressure Pm measured by the pressure notification unit 6 and the pressure measurement unit 4 that can generate the notification sound reaches the filling pressure Pb (Pm = Pb), the sound signal from the sound notification unit 6 is turned ON. The buzzer is sounded for a predetermined time, for example, for 3 to 10 seconds, the time measuring operation is started, the filling electromagnetic valve 35 is closed, and the filling of air into the tire W is temporarily stopped. After that, when the counting time T measures a predetermined filling state confirmation time T1 (T = T1), the controller 7 that turns on the acoustic signal of the acoustic notification unit 6 again to generate a notification sound from the buzzer, and filling And a display unit 8 for displaying display information such as a filling pressure set by the pressure setting unit 5.

  The tire W is a tire of a large vehicle such as a bus and a large truck, and will be described below assuming a tire mounted on a wheel. However, the target tire W is not limited to this. The tires of various vehicles such as motorcycles, ordinary cars, and mini cars may be used.

  The compressed air generator 2 includes a compression pump, an electric motor that drives the compression pump, a pressure control valve that adjusts the pressure of the pressurized air that flows out of the compression pump to a set pressure, and the like. One end of the supply piping section 3 is connected to the output port of the pressure control valve.

  The control unit 7 determines that the differential pressure ΔP (= | Pm−Pb |) between the measured pressure Pm and the filling pressure Pb when the time measurement time T measures the predetermined filling state confirmation time T1 is a predetermined first pressure. When the pressure is equal to or higher than P1 and equal to or lower than a predetermined second pressure P2 higher than the first pressure P1, a control signal is output to open the charging solenoid valve 35 to generate compressed air.

  The control unit 7 includes an arithmetic processing unit 10, a first storage unit M1 that stores a program for operating the tire air filling device 1 of the present embodiment, a measurement pressure Pm that is measured by the pressure measurement unit 4, and a filling pressure. A filling pressure Pb set by the setting unit 5, the predetermined filling state confirmation time T1, the first pressure P1, the second pressure P2, and the like are configured to include a second storage unit M2.

  The arithmetic processing unit 10 may be realized by a central processing unit (abbreviated as CPU). The first storage unit M1 is realized by a ROM (Read Only Memory), and the second storage unit M2 is realized by a RAM (Random Access Memory).

  The arithmetic processing unit 10 outputs an opening / closing signal to the filling solenoid valve 35 and the exhaust solenoid valve 36 in response to the input unit 10a that receives the signal from the filling pressure setting unit 5 and the signal that is input from the input unit 10a. An open / close signal output unit 10b, an A / D conversion unit 10c that converts an analog measurement pressure signal representing the measurement pressure Pm from the pressure measurement unit 4 into a digital signal, and an acoustic signal output unit that outputs an acoustic signal to the acoustic notification unit 6 10d, and a display signal output unit 10e for outputting a display signal for displaying display information on the display unit 8.

  The input unit 10a, the open / close signal output unit 10b, the A / D conversion unit 10c, the acoustic signal output unit 10d, and the display signal output unit 10e execute the program stored in the second storage unit M2, thereby executing the program. This is realized by software resources using the arithmetic processing unit 10 as hardware resources.

  The predetermined filling state confirmation time T1 is set to be shorter than the safety confirmation time T2 after completion of filling the tire W with air. The safety confirmation time T2 is when the tire W is punctured or the like, and the tire W may burst immediately after filling. Therefore, when the air is filled up to a filling pressure Pb defined as a maintenance standard, for example, 800 kPa. , It is specified that it is allowed to stand for 5 minutes after filling, and this is the standing time. With respect to such safety confirmation time T2, the predetermined filling state confirmation time T1 is set to, for example, 4 minutes 59 seconds.

  In the present embodiment, the first storage unit M1 in which the program is stored may be a storage device such as a hard disk device in addition to the semiconductor memory such as the ROM, and is not limited to these storage devices. Any computer-readable recording medium may be used. As a computer-readable recording medium, for example, a tape recording medium such as a magnetic tape / cassette tape, a magnetic recording disk such as a floppy (registered trademark) disk, a magnetic disk such as a flexible disk / hard disk, or the like CD-ROM (Compact Disk Read Only Memory) / MO (Magneto Optical disk) / MD (Mini Disk) / DVD (Digital Versatile Disk) and other optical disk recording media, IC (Integrated Circuit) cards (memory cards Fixed) including a card-type recording medium such as an optical card, or a semiconductor memory such as a mask ROM / EPROM (Erasable Programmable Read Only Memory) / EEPROM (registered trademark, Electrically Erasable Programmable Read Only Memory) / flash ROM A recording medium carrying a program May be.

  The tire air filling apparatus 1 further includes a relay drive circuit 33, relays 34a and 34b, a filling electromagnetic valve 35, an exhaust electromagnetic valve 36, and an operational amplifier 37. In response to a control signal from the control unit 7, the relay drive circuit 33 operates the relays 34a and 34b, and opens and closes the above-described filling solenoid valve 35 and exhaust solenoid valve 36, respectively. The filling solenoid valve 35, the pressure measuring unit 4, and the exhaust solenoid valve 36 are connected to the supply piping unit 3.

  When the filling solenoid valve 35 is opened while the exhaust solenoid valve 36 is closed, compressed air from the compressed air generating unit 2 is supplied to an air filling hose 15 described later, and the nozzle 17 is connected to the tire W. By connecting to the valve, the tire W is filled with air. Further, when the exhaust solenoid valve 36 is opened with the filling solenoid valve 35 closed, the air filled in the tire W can be forcibly exhausted.

  Such a forced exhaust function allows the air filling hose 15 to be used when the air in the tire W is removed for repair of the tire W or when air is filled more than the set pressure during automatic filling. It is provided for discharging the air in the tire W while being connected to the tire W. The air in the tire W passes through the air filling hose 15 from the nozzle 17 and is exhausted from the exhaust solenoid valve 36. At this time, if fine foreign matter such as dust is mixed in the air filled in the tire W, the foreign matter enters the operation head 14 from the air filling hose 15, and the exhaust solenoid valve 36 and the pressure sensor. 4 may cause a failure. Therefore, in order to prevent foreign matter in the tire W from entering the operation head 14 side during forced exhaust, the air filling hose 15 has an exhaust filter downstream of the pressure sensor 4 in the air filling direction, that is, on the nozzle 17 side. 40 is provided.

  The pressure measuring unit 4 is provided between the filling solenoid valve 35 and the exhaust solenoid valve 36 in the supply piping unit 3 and measures the pressure of the air filled in the tire W and outputs it as an analog measurement signal Pm. Configured to be able to.

  The display unit 8 includes a display drive circuit 19 and a display panel 21. The display panel 21 includes a plurality (three in this embodiment) of segments 21a, 21b, and 21c that can display numerical values, English characters, symbols, and the like. Each segment 21a, 21b, 21c represents each digit, and is realized by, for example, a reflective liquid crystal display element.

  FIG. 2 is a perspective view showing an appearance of the tire air filling device 1. The tire air filling device 1 includes a plate-like base 12 that is fixedly installed on a floor where vehicles such as a gas station and an automobile maintenance shop can enter and exit, and a post portion 13 that stands on the base 12. The operation head 14 provided at the upper end of the post portion 13 and the take-up reel 16 provided in the middle portion of the post portion 13 so as to be arranged substantially horizontally and wound so that the air-filled hose 15 can be unwound.

  A nozzle 17 that can be connected to the tube of the tire W is provided at the tip of each air-filled hose 15c. The supply piping unit 3 includes the air filling hose 15 and a pipe (not shown) connected to the compressed air generation unit 2 from the other end of the air filling hose 15.

  FIG. 3 is a front view showing the operation panel 14 a of the operation head 14. The operation head 14 is formed in a substantially rectangular parallelepiped shape, and an operation panel 14a is provided on the front side perpendicular to the paper surface of FIG. The operation panel 14a includes a substrate 20, a display panel 21, a start button 22, a kPa unit lamp 23a, a MPa unit lamp 23b, a timer mode lamp 23c, a puncture mode lamp 23d, a high pressure filling mode display lamp 23e, an OR mode display lamp 23f, a mode. A selection button 24, an exhaust button 25, a plus button 26, a skip button 27, a stop button 28, a minus button 29, and a check button 30 are provided.

  The mode selection button 24 is switched to a 5-minute standby mode after completion of filling up to the set pressure to the tire W, and a timer mode for displaying the elapsed time on the display unit, from the standard minimum set pressure 150 kPa to 100 kPa for puncture confirmation inspection. When an error occurs in the normal filling mode when filling a tire with a large filling volume such as a puncture mode to be set, a high pressure filling (LT-HI) mode in which high pressure filling of an LT tire is performed at 800 kPa or higher, or an OR tire It functions as a button for switching the OR mode for returning to the state where it can be filled.

  Each time the mode selection button 24 is pressed, the mode lamps 23c, 23d, 23e, and 23f are turned off in the “normal filling mode”, “timer mode”, “puncture mode”, “high pressure filling mode”, “ The mode is switched to the “high pressure filling timer mode” and the “OR mode” in this order, and the “normal filling mode” is restored.

  When the start button 22 is pressed, the electromagnetic valve 35 for filling is opened by the control unit 7 and the filling operation is started in the normal filling mode.

  The exhaust button 25 functions as a button for quickly exhausting the filled air in the tire W when the defective tire W is erroneously filled by being pressed.

  The skip button 27 is pressed in units of 100 kPa by pressing the plus button 26 or the minus button 29 while pressing the button 27, and in units of 10 kPa by pressing only the plus button 26 or the minus button 29. Functions as a button to change the set pressure.

  The check button 30 functions as a button that can display the current pressure in the tire on the display unit 8 by performing a pressing operation in a state where the nozzle 17 is bitten by the valve of the tire W.

  The start button 22, the mode selection button 24, the exhaust button 25, the plus button 26, the skip button 27, the stop button 28, the minus button 29, and the check button 30 are realized by, for example, a sheet switch provided on the board 20, and the control It is electrically connected to the part 7. The control unit 7 is provided in the operation head 14. By pressing each button 22, 25 to 30, a signal corresponding to the pressed button is input to the control unit 7, and a command from the control unit 7 is received. In response to this, the lamps 23a to 23f are configured to be turned on / off. Each lamp 23a-23f is implement | achieved by LED (Light Emitting Diode), for example.

  FIG. 4 is a flowchart for explaining the operation of the tire air filling device 1. First, the operation of the tire air filling device 1 is started, and when an operator connects the nozzle 17 of the air filling hose 15 to the valve of the tire W and the filling preparation is completed, the following steps S1 to S12 are executed. The filling solenoid valve 35 and the exhaust solenoid valve 36 are always closed.

  In step S <b> 1, the operator presses the plus button 26, the skip button 27, and the minus button 29 to set the air filling pressure Pb to be filled in the tire W. Such a setting range of the filling pressure Pb can be set, for example, at 150 to 1200 kPa. The set filling pressure Pb is displayed on the display panel 21.

  In step S2, the timer mode is set by pressing the mode selection button 23c. Next, when the start button 22 is pressed, the control unit 7 opens the filling electromagnetic valve 35 in response to a signal generated by pressing the start button 22, and filling of the tire W is started. Measurement of the filling pressure Pb in W is started.

  In the next step S3, the control unit 7 compares the measured pressure Pm measured by the pressure measuring unit 4 with the set filling pressure Pb to determine whether or not filling has started, and the next Control goes to step S4.

  In step S4, the control unit 7 determines whether or not the measured pressure Pm and the filling pressure Pb have reached the set filling pressure Pb based on the comparison result. When it is determined that the measured pressure Pm has reached the filling pressure Pb, the control unit 7 closes the filling electromagnetic valve 35 to stop filling the tire W with air, and the sound notification unit 6 sounds a buzzer. Then, it is notified that the filling is completed, and the process proceeds to the next step S5.

  In step S5, a time measuring operation is started by a timer (not shown) provided in the control unit 7 from the time when the measured pressure Pm reaches the set filling pressure Pb. In step S6, whether or not the filling state confirmation time T1 is counted. Is judged. When the filling state confirmation time T1 is measured, the process proceeds to the next step S7, where the pressure is measured by the pressure measuring unit 4, and the measured pressure Pm is input to the control unit 7.

  In step S8, the control unit 7 obtains a differential pressure ΔP (= | Pm−Pb |) between the input measurement pressure Pm and the filling pressure Pb, and determines whether or not the differential pressure ΔP is equal to or higher than the first pressure P1. Is done. If it is 1st pressure P1 or more, it will move to the following step S9, and if it is less than 1st pressure P1, since it can be assumed that the internal pressure of the tire W was not released, it moves to step S11. For example, 20 kPa is set in the control unit 7 as the first pressure P1.

  In step S9, the control unit 7 determines whether or not the measured pressure Pm is equal to or lower than the second pressure P2. If the pressure is equal to or lower than the second pressure P2, it is assumed that the internal pressure of the tire W has been released due to air leakage, and the process proceeds to the next step S10. Further, when the pressure is not equal to or lower than the second pressure P2, that is, when the pressure exceeds the second pressure P2, it is assumed that the internal pressure of the tire W is excessively released. Therefore, the process proceeds to the next step S11 and a notification operation is performed. The For example, 100 kPa is set in the second storage unit M2 as the second pressure P2, and is input to the control unit 7.

  In step S10, the auxiliary filling operation is started. When the auxiliary filling is completed in step S11, the process proceeds to step S12.

  In step S12, a notification operation is executed in response to a command from the control unit 7, and a notification sound is output from the buzzer of the sound notification unit 6 as described above. As the notification sound, for example, an electronic sound such as “beep, beep, beep,...” Is intermittently generated.

  As described above, according to the present embodiment, the compressed air generation unit 2 and the tire W are connected by the supply piping unit 3, and the compressed air generated by the compressed air generation unit 2 passes through the supply piping unit 3 to the tire W. Supplied. The pressure of the air in the supply piping unit 3 is measured by the pressure measurement unit 4. The filling pressure Pb of the air filled into the tire W is set by the filling pressure setting unit 5. When the measured pressure Pm measured by the pressure measuring unit 4 reaches the filling pressure Pb, the control unit 7 starts a time measuring operation by a timer (not shown), and when the time measured is a predetermined charging state confirmation time T1, The sound notification unit 6 generates a notification sound and stops the compressed air generation unit 2.

  In this way, after the measured pressure Pm reaches the set filling pressure Pb, the fact that the standby time for safety has elapsed is notified by sound, and the convenience of the air filling operation to the tire W can be improved. it can.

  Further, according to the present embodiment, the control unit 7 determines that the differential pressure ΔP between the measured pressure Pm and the filling pressure Pb when the counting time T1 is measured is a predetermined first pressure P1 or more. And when the pressure is equal to or lower than a predetermined second pressure P2 higher than the first pressure P1, the compressed air generating section 2 generates compressed air, so that the tire W is supplemented with air, and the air pressure of the tire W is Since the filling can be surely performed at the set filling pressure Pb, it is not necessary for the operator to measure the waiting time for the safety check as in the prior art, and the worker's work is on standby. The problem of being restricted until time elapses can be prevented, and the convenience of the air filling operation into the tire W can be improved.

  Further, according to the present embodiment, the predetermined filling state confirmation time T1 (for example, 4 minutes 59 seconds) is shorter than the safety confirmation time T2 (for example, 5 minutes) after completion of filling the tire W with air. Since there is no abnormality after checking the tire condition and dealing with the condition immediately before the safety confirmation time has passed, the safety confirmation time has passed and if there is an abnormality Thus, before the safety confirmation time elapses, the abnormality can be dealt with, and the tire can be smoothly filled with air.

  In the above-described embodiment, the tire air filling device 1 that can be individually filled with one system of air filling hose 15 has been described. However, in another embodiment of the present invention, two systems, three systems, four systems or more of air filling are performed. Even if it is a case provided with a hose, this invention can be implemented suitably.

DESCRIPTION OF SYMBOLS 1 Tire air filling apparatus 2 Compressed air generation part 3 Supply piping part 4 Pressure measurement part 5 Filling pressure setting part 6 Sound notification part 7 Control part 8 Display part 10 Central processing unit 12 Base 13 Post part 14 Operation head 14a Operation panel 15 Air-filled hose 16 Take-up reel 17 Nozzle 20 Substrate 21 Display panel

22 Start button 23 Check lamp 24 High pressure display lamp 26 Check button 27 Stop button 28 Exhaust button 29 Unit selection button M1 1st storage part M2 2nd storage part P1 1st pressure P2 2nd pressure Pb Filling pressure Pm Measurement pressure T1 Filling state Confirmation time T2 Safety confirmation time ΔP Differential pressure W Tire

Claims (3)

A compressed air generating section for generating compressed air;
Connecting the compressed air generating unit and the tire, and supplying the compressed air generated in the compressed air generating unit to the tire;
A pressure measuring unit for measuring the pressure of air in the supply piping unit;
A filling pressure setting unit for setting a filling pressure of air filled in the tire;
An acoustic notification unit capable of generating a notification sound;
Control that starts a time measuring operation when the measured pressure measured by the pressure measuring unit reaches the filling pressure, and causes the sound notification unit to generate a notification sound when a predetermined filling state confirmation time is counted. A tire air filling device.   The control unit is configured such that a differential pressure between the measured pressure and the filling pressure when the time keeping time measures the predetermined filling state confirmation time is equal to or higher than a predetermined first pressure and higher than the first pressure. 2. The tire air filling device according to claim 1, wherein when the pressure is equal to or lower than a predetermined second pressure, the compressed air generating section generates compressed air.   3. The tire air filling device according to claim 1, wherein the predetermined filling state confirmation time is set to be shorter than a safety confirmation time after completion of air filling of the tire.

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