JP4727808B2 - Pneumatic equipment inspection equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inspection apparatus for pneumatic equipment, and more particularly, to an apparatus for inspecting an air pressure gauge installed in a pneumatic equipment.
[0002]
[Prior art]
Automobiles and aircraft are equipped with tires filled with pressurized air inside, tire changers for detaching these tires from the wheels (rims), air inflators for filling tires with specified pressure air, tires Various types of pneumatic equipment such as tire gauges for checking the air pressure filled in are commercially available.
[0003]
[Problems to be solved by the invention]
By the way, in order to know the air pressure, the above pneumatic equipment is equipped with an air pressure gauge consisting of a Bourdon tube, a strain gauge, etc., but it was used without knowing that the air pressure gauge of the pneumatic equipment was broken or the air piping leaked. Inconvenience arises. For example, when the working pressure (actual air pressure) is lower than the value of the air pressure gauge due to a failure of the air pressure gauge or air pipe leakage in an automobile tire changer, the air pressure charged into the tire is insufficient and the workability of the tire changer is also poor. Become. If the tire has low air pressure, it will not work well when turning, and the side part will bend each time it comes in contact with the ground, so there is a risk of heating and bursting at high speeds. It is checked regularly or irregularly at tire specialty stores and gas stations to see if it is kept at a certain level. If the air inflator's air pressure gauge at the tire specialty store or at the gas station incorrectly indicates a value higher than the actual air pressure, the lack of air pressure will not be resolved, and the customer's trust may be lost. Become.
[0004]
Therefore, when trying to check whether the measurement accuracy of automobile tire changers and air inflators has fallen, a separate pressure vessel filled with pressurized air is prepared. Gauges are connected separately, the readings of the pressure gauge and master gauge at that time are read, and the readings of the two are compared to determine whether the measurement accuracy of the pressure gauge has dropped.
[0005]
However, these conventional inspection methods have the following problems.
[0006]
(1) Since the object to be inspected and the master gauge must be alternately connected to one pressure vessel for measurement, measurement errors will occur in the indicated value due to air leakage from the pressure vessel at that time. I can't prevent it.
[0007]
(2) In particular, if you want to inspect at two or more different measurement points (so-called multiple points), prepare pressure vessels with different filling pressures and reconnect them each time, or if there is only one pressure vessel, use some method. Since it is necessary to reconnect after reducing the outlet pressure of the pressure vessel to the pressure to be inspected, it takes time to reconnect.
[0008]
(3) On the other hand, there is an inspection method for measuring at multiple points while minimizing measurement errors. This can be done by, for example, preparing necessary equipment each time you want to inspect and assembling the inspection device on the spot or removing only the pneumatic meter from the pneumatic device to be measured. In this method, the same pressure is applied to the gauge at the same time before the inspection work is performed. However, since this inspection method is troublesome and time consuming, it is practically hardly performed.
[0009]
As a result of the above (1) to (3), the accuracy inspection of pneumatic equipment equipped with an air pressure gauge has been rarely performed after being marketed.
[0010]
Therefore, the present invention enables to apply the same set air pressure simultaneously to the air pressure gauge and the master gauge provided in the pneumatic device just by connecting the pneumatic device to the inspection device of the present invention, moving or disassembling the pneumatic device, The purpose is to inspect the air pressure meter easily and in a short time while suppressing the occurrence of errors by using the functions of the pneumatic equipment without processing and the like.
[0011]
Another object of the present invention is to make it possible to go to a place with pneumatic equipment by using a small and portable inspection device.
[0012]
[Means for Solving the Problems]
A first invention is an inspection apparatus for pneumatic equipment, comprising an air connector for connecting to an air valve of a tire, and an air pressure gauge for knowing the pressure of air supplied to the tire or the air pressure in the tire from the air connector. A connection port for introducing pressurized air from a pressure source, a reference master gauge, a receiving port for coupling with the air connector, and pressurized air from a pressure source introduced from the connection port. Pressure setting means for reducing and setting to a predetermined pressure, and air pressure distribution means for distributing the pressurized air set to the predetermined pressure to the master gauge and the receiving port, the pressure setting means, A passage that branches a passage of pressurized air from a pressure source into a plurality of passages, a passage that joins the passages into one, and a passage that connects these passages to the air pressure distribution means. If, manual and a plurality of push button capable, the valve group for switching the flow path is the branch in instruction of push buttons in a plurality Street A pressure reducing valve interposed in each branched flow path; This is a push button type pressure setting device.
[0015]
First 2 According to the invention, in the first invention, the master gauge comprises an element for detecting pressure and means for converting the pressure detected by the element into an electric signal and displaying it.
[0016]
First 3 In the invention of the first Or second In the invention, the connection port, the master gauge, the receiving port, the pressure setting means, and the air pressure distribution means are all configured to be integrated and transportable.
[0017]
First 4 In the invention of the 2 In the invention, a terminal for outputting the electrical signal is provided.
[0018]
【The invention's effect】
Pneumatic equipment that supplies pressurized air to the tire from the air connector (for example, a tire changer or air inflator) is not used, and the pressurized air is shut off by a shutoff valve etc. upstream of the air pressure gauge. The air pressure passage from the connector to the air pressure gauge is at atmospheric pressure. Also, even if an air connector is connected, pressurized air cannot be supplied, and from the air connector to the air pressure gauge when no pneumatic equipment (such as a tire pressure gauge) is used to know the air pressure inside the tire. The air pressure passage is at atmospheric pressure.
[0019]
1st, 1st 2 According to the invention, when inspecting these pneumatic devices, the inspection device of the present invention is prepared, and the pressurized air from the pressure source is introduced into the connection port of the inspection device, and the pneumatic device is not used. If the air connector is coupled to the receiving port of the inspection device and set to the pressure to be inspected by the pressure setting means of the inspection device, the pressurized air set by the pressure setting means is transferred to the master gauge via the air pressure distribution means or It is supplied to the pneumatic equipment through the air connector of the pneumatic equipment. At this time, since the pneumatic device is not in use, the air pressure meter provided in the pneumatic device indicates the pressure of the pressurized air supplied to the pneumatic device from the air connector, and the following effects are produced.
[0020]
(1) It is possible to apply the same pressure to the object to be inspected (pneumatic gauge) and the master gauge at the same time without adding disassembly and installation to the pneumatic equipment, and the measurement accuracy is improved.
[0021]
{Circle around (2)} Since it is not necessary to alternately connect the inspection object and the master gauge as compared with the conventional inspection method, the inspection time can be shortened and measurement errors such as air leakage can be eliminated.
[0022]
(3) Since an external pressure source holding a constant pressure may be used as the pressure source, there is no need to provide a pressure vessel.
[0023]
(4) When inspecting at multiple points, it is only necessary to reduce the pressure to a predetermined pressure (pressure to be inspected) by the pressure setting means. Just because the inspection is performed at multiple points, the inspection object and the master gauge are reconnected each time. This is unnecessary, and the work required for the inspection can be facilitated and the time required for many points can be shortened.
[0024]
{Circle around (5)} If the presence or absence of a malfunction of the pneumatic equipment is confirmed by the inspection in this way, the reliability of the customer's store is increased, and further, an accident due to insufficient air pressure can be prevented.
[0026]
First 3 According to the invention, since the inspection device can be carried, it is possible to go to a place where the pneumatic equipment is located, and thus it is possible to easily inspect pneumatic equipment such as a tire changer which is a fixed facility.
[0027]
First 4 According to the invention, the measurement result can be extracted and used as an external output. Moreover, the measurement variation by visual observation can be avoided.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view of an inspection device 1 (inspection apparatus) for a pneumatic device according to an embodiment of the present invention, and FIG. 2 shows an air piping diagram of the inspection device 1.
[0029]
In FIG. 1, reference numeral 2 denotes a main body case of the inspection device 1, which is formed of a hollow rectangular parallelepiped metal plate having a size that protrudes slightly from the palm of one hand as a whole, as shown in FIG. 1 only on one surface (board surface) 2a. Are provided with an air connector 3, an air chuck receptacle 8, a pressure indicator 10, and the like. The air chuck receptacle 8 is also an air connector itself, but this name is used because it is easy to understand due to the relationship with the air chuck. Further, the inspection device 1 is designed to be portable weight as a whole.
[0030]
The air connector 3 (connection port) on the panel surface 2a is for taking in pressurized air. What is necessary is just to use what is equipped with the tire specialty store and the service factory as a pressurized air source which generate | occur | produces pressurized air. For example, as shown in FIG. 2, the pressurized air source 21 includes an air compressor 22 and an air tank 23 (filled with 7 to 8 bar of pressurized air). A female) 24 is connected to the air connector (male) 3 of the inspection device 1 to introduce pressurized air into the inspection device 1.
[0031]
The pneumatic passage 4 connected to the air connector 3 is branched into two downstream of a pressure setting device 5 (pressure setting means) interposed in the middle, and one branch passage 6 is provided on the panel surface 2a. 8, the other branch passage 7 is connected to a pressure sensor 9 (comprising a strain gauge) as a master gauge. Here, the air pressure distribution means is constituted by the air pressure passage 4 and the branch air pressure passages 6 and 7.
[0032]
The pressure setting device 5 is for adjusting the pressure (original pressure) of the pressurized air supplied from the pressurized air source 21 to a pressure to be inspected. The pressure setting device 5 is composed of a pressure reducing valve capable of continuously changing the degree of pressure reduction by manually turning a knob.
[0033]
An air chuck (female) 33 of an automobile tire changer 31 is connected to the air chuck receptacle (male) 8. In FIG. 2, only an air pressure gauge 32, an air chuck 33 as an air connector, and an air tube 34 that communicates both are shown, but this shows a state in which these components 32, 33, and 34 are removed from the tire changer 31. It is not a thing, but only the whole tire changer is shown by representing a part of the tire changer.
[0034]
Now, when the entire tire changer 31 is shown in FIG. 5, this is a substantially rectangular parallelepiped base 62, a turntable 64 which is on the base 62 and can be rotated in the normal and reverse directions, and a tire placed horizontally on the table 64. A claw-shaped chucking gripper 65 for fixing a wheel (not shown), a tower 66 standing upright behind the base 62, a movably attached to the tower 66, and removing the tire from the wheel, to the wheel The mount demount tool 67 used for assembling the tire, the lock handle 68 for fixing the mount demount tool 67 to the tower 66, and the side of the base 62 (right side in the figure) are provided. The bead breaker 69 for pressing the bead portion of the tire and removing it from the rim is located below the base 62 (downward in the front in the figure). Each of the pedals 71, 72, 73 for operating the turntable 64, the bead breaker 69, and the chucking gripper 65, a pressure-resistant air tube 82 having an air chuck 81 (air connector) at its tip, and the air chuck 81 as a tire valve An analog display air gauge 83 is provided below the base 62 (downward on the left side in the figure) for visually checking the filled air pressure when coupling (connecting) and filling the tire with air. It consists of an inflator pedal 85 for introducing and shutting off pressurized air.
[0035]
The air tube 82 is connected to a pneumatic passage (not shown) piped in the table 62 via the pressure-resistant air tube 86, and a source pressure is introduced into the pneumatic passage from the outside.
[0036]
The tire is removed after the compressed air is removed from the tire, and the tire is assembled as follows (see FIG. 6).
[0037]
(1) After the tire 91 is assembled with the wheel 92, the air chuck 81 is attached to the tire valve 91a.
[0038]
{Circle around (2)} The inflator pedal 85 (FIG. 5) is stepped on with a foot, and pressurized air from the tire changer is ejected from the air chuck 81 to first bring the bead portion 91 b of the tire 91 into close contact with the rim 92 a of the wheel 92.
[0039]
(3) Then, depress the inflator pedal 85 while adjusting it until the proper air pressure is reached.
[0040]
(4) The air pressure filled in the tire 91 is visually checked with the air pressure gauge 83 (FIG. 5). If the air pressure exceeds the appropriate value and the air pressure is excessively applied, the release valve 84 (FIG. 5) near the air pressure gauge 83 is turned on. Press to release excess pressurized air and adjust to proper air pressure. The release valve 84 is a valve for releasing the pressurized air in the air tube 82 to the atmosphere.
[0041]
(5) When the tire pressure reaches an appropriate value, the air chuck 81 is removed from the tire valve 91a.
[0042]
The general structure of a tire changer for an automobile and the method of use thereof are as described above. When FIG. 5 and FIG. 2 are associated with each other, the air chuck 81, the air gauge 83, and the air tube 82 of FIG. 33, an air pressure gauge 32, and an air tube 34. That is, when inspecting the air gauge 83 (air pressure gauge 32) of the tire changer 31, the air chuck 81 (air chuck 33) of the tire changer 31 is left as it is without disassembling or removing a part of the tire changer 31. What is necessary is just to connect (coupling) to the air chuck receptacle 8 of the tester 1.
[0043]
There is a type in which an air gauge (a pneumatic gauge) is not incorporated in the tire changer body. As shown in FIG. 7, in addition to the tire changer body, the handle 102 with the air supply lever 102a is equipped with an air gauge 103 and a release valve 104, and the handle 102 has an air chuck 106 at the tip. A pressure-resistant air tube 105 is connected. These are called hand inflators 101 and are housed by being hooked together with the air tubes on hooks fixed to the side of the tower as shown in FIG. Reference numeral 107 denotes a pressure-resistant air tube that communicates the handle 102 with the pneumatic passage in the tire changer body.
[0044]
The tire assembling operation using the hand inflator 101 is as follows (substantially the same as described above).
[0045]
(1) After the tire 91 is assembled and assembled to the wheel 92 as shown in FIG. 6, the air chuck 106 is attached to the tire valve 91a.
[0046]
(2) The handle 102 of the hand inflator 101 is grasped by hand together with the air supply lever 102a, and pressurized air is ejected from the air chuck 106 so that the bead portion 91b of the tire 91 is first brought into close contact with the rim 92b of the wheel 92.
[0047]
(3) While visually checking the air gauge 103 of the hand inflator 101, grasp the air supply lever 102a while adjusting the air supply lever 102a so that the prescribed air pressure is obtained.
[0048]
(4) When the tire 91 is filled with pressurized air higher than the specified pressure, the release valve 104 of the hand inflator 101 is pushed to adjust.
[0049]
(5) When the air pressure of the tire 91 reaches a specified value, the air chuck 106 is removed from the tire valve 91a.
[0050]
In the tire changer including such a hand inflator 101, the air chuck 106, the air gauge 103, and the air tube 105 in FIG. 7 are the air chuck 33, the air pressure gauge 32, and the air tube 34 in FIG.
[0051]
Returning to FIG. 1 and FIG. 2, the output of the pressure sensor 9 for detecting the pressure in the branch air passage 7 is converted into an electric signal, and digitally displayed on the pressure display 10 on the panel surface 2a with three digits with a decimal point. The pressure indicator 10 is supplied with necessary electricity from a 12V battery 11 as a power source.
[0052]
Note that piping joints and piping tubes (not shown) for forming the pneumatic passages 4, 6, and 7 shown in FIG. 2 are housed in the main body case 2 together with the pressure sensor 9.
[0053]
FIG. 3 is an electrical wiring diagram of the inspection device 1. In the figure, the positive and negative terminals 11a and 11b of the battery 11 are respectively connected to the positive and negative terminals 10a and 10c of the pressure indicator 10 via the terminal block 12, and the battery 11 and the pressure indicator. When the power switch 13 is closed, a DC current from the battery 11 is supplied to the pressure indicator 10 and the pressure at that time is supplied. The air pressure of the branch air pressure passage 7 detected by the sensor 9 (the air pressure set by the pressure setting device 5) is displayed.
[0054]
Both terminals 11a and 11b of the battery 11 are also connected to the low voltage detection circuit 14, and when the battery 11 voltage drops below a predetermined value, the low voltage detection circuit 14 detects this and turns on the alarm lamp 15 on the panel surface 2a. To do. This is because when the voltage of the battery 11 decreases, the pressure indicator 10 cannot perform an accurate display, so that this is informed and the battery 11 is urged to be charged. The battery 11 is a lead storage battery capable of storing electricity, and includes an electrical connector 16 on the panel surface 2a. Therefore, if the electrical connector (male) 42 at the tip of the battery charger 41 is connected to the electrical connector (female) 16 of the tester 1, the discharged battery 11 can be charged. The battery charger 41 may be a converter that converts household 100V to 12V, for example.
[0055]
In order to use the pressure detected by the pressure sensor 9 as data, an output connector 17 (also an electrical connector) connected to the output terminal 10b and the minus terminal 10c of the pressure indicator 10 is provided on the panel surface 2a. Data is taken into the data processing device from the connector 17. As shown in FIG. 2, the data processing device 51 is, for example, a personal computer 52, and an input terminal (male) 53 to the personal computer 52 is connected to the output connector (female) 17 of the tester 1.
[0056]
In FIG. 3, wiring portions other than the pressure indicator 10, the power switch 13, the alarm lamp 15, the electrical connector 16, and the output connector 17 are housed in the main body case 2 together with the terminal block 12.
[0057]
Next, a method for inspecting an automobile tire changer using the inspection device 1 will be described generally as follows. In addition, these inspection methods are only examples, and are not limited thereto.
[0058]
[Inspection method 1]
{Circle around (1)} Since the air connector 3 and the air chuck receptacle 8 are both open to the atmosphere before use, the air pressure passage 4 and the branch air pressure passages 5, 6 and 7 are in an atmospheric pressure state. After confirming that the power switch 13 of the tester 1 is turned off before the operation is started, the pressure setting unit 5 of the tester 1 is manually operated to set the minimum pressure. This is to prevent unexpectedly high pressure (primary pressure) from acting on the pressure sensor 9 and the air gauge 83 (pneumatic gauge 32) of the tire changer 31 to prevent damage.
[0059]
(2) The air chuck 81 (air chuck 33) of the tire changer 31 is connected to the air chuck receptacle 8 of the inspection device 1.
[0060]
(3) The air connector 24 at the tip of the air hose from the air pressure source 21 is connected to the air connector 3 of the inspection device 1 in order to take in the pressurized air into the inspection device 1 from the outside. By this connection, the air pressure passage downstream of the pressure setting device 5 is maintained at the lowest air pressure. That is, the same pressurized air set by the pressure setting device 5 is supplied to the pressure sensor 9 as a master gauge and the air gauge 83 of the tire changer 31.
[0061]
This will be further described with reference to the tire changer shown in FIG. 5. The inflator pedal 85 is in the middle of a pneumatic passage connecting the original pressure (air pressure from the pressurized air source) and the air tubes 82 and 86, and the flow rate of the pressurized air The flow rate control valve (not shown) is actuated, and the flow rate control valve is shut off when the foot is separated from the inflator pedal 85. Therefore, when the tire changer is not used, the pneumatic passage from the flow rate adjusting valve to the air chuck is at atmospheric pressure. In this state, the pressurized air adjusted by the pressure setting device 5 reaches the flow control valve from the air chuck receiving port 8 through the air chuck 81 and the air tubes 82 and 86, and when the pressurized air is spread, the air gauge 83 is in the air. The value of the pressurized air in the tubes 82 and 86 is indicated. That is, in this state, the same pressurized air downstream of the pressure setting device 5 is supplied to the pressure sensor 9 and the air gauge 83 of the tire changer 31 via the branch air pressure passages 6 and 7.
[0062]
(4) The power switch 13 of the tester 1 is turned on from off. As a result, the lowest air pressure adjusted by the pressure setting device 5 is displayed on the pressure display 10.
[0063]
(5) Assuming that the pressure to be measured is a total of 6 points, with the lowest being 1 bar, the highest being 6 bar, and every other interval between them, until the pressure display 10 displays 1.00 bar, The pressure setting device 5 is manually operated, the display of the air gauge 83 at that time is visually read, and the read value is written in a table in the inspection report prepared in advance (see FIG. 4).
[0064]
(6) Next, the pressure setting device 5 is operated by hand until the pressure display 10 displays 2.00 bar this time, and the display on the air gauge 83 at that time is visually read, and the read value is the above-mentioned value. Fill in the table. This operation is repeated from 3.00 to 6.00 bar.
[0065]
(7) In some cases, the display of the air gauge 83 may differ depending on whether the air pressure increases or decreases. In this case, the next operation is further continued.
[0066]
(8) After finishing the measurement up to 6.00 bar, operate the pressure setting unit 5 by hand until a value exceeding 6.00 bar is displayed on the pressure display 10, and then 6.00 bar is again displayed on the pressure display. The pressure setter 5 is operated in the reverse direction until it is displayed at 10, and the display of the air gauge 83 at that time is visually read, and the read value is written in the above table.
[0067]
(9) Next, slowly operate the pressure setting device 5 by hand until 5.00 bar is displayed on the pressure display 10, and the display on the air gauge 83 at that time is visually read, and the read value is the above-mentioned value. Fill in the table. This operation is repeated until 1.00 bar.
[0068]
[Inspection method 2]
In the inspection method 1, the set pressure is adjusted by looking at the pressure indicator 5. The inspection method in this case is as follows. The operations from (1) to (4) are the same and will be omitted.
[0069]
(5) ′ Assuming that the pressure to be measured is a total of 6 points, with the lowest being 1 bar, the highest being 6 bar, and every other interval between them, the pressure setting device 5 of the tester 1 is first adjusted until the air gauge 83 becomes 1 bar. It is operated by hand, and the display of the pressure indicator 10 at that time is visually read, and the read value is written in a table in the inspection report prepared in advance (see FIG. 4).
[0070]
(6) Next, the pressure setter 5 is operated by hand until the air gauge 83 becomes 2 bar this time, the display of the pressure indicator 10 at that time is visually read, and the read value is entered in the above table. . This operation is repeated from 3 to 6 bar.
[0071]
(7) In some cases, the display of the air gauge 83 may differ depending on whether the air pressure increases or decreases. In this case, the next operation is further continued.
[0072]
(8) After measuring up to 6 bar, manually operate the pressure setting device 5 until the air gauge 83 reaches a value exceeding 6 bar, and then move the pressure setting device 5 in the reverse direction until the air gauge 83 reaches 6 bar again. Operate it, visually read the display of the pressure indicator 10 at that time, and write the read value in the above table.
[0073]
(9) Next, the pressure setting device 5 is slowly operated by hand until the air gauge 83 reaches 5 bar, the display on the pressure indicator 10 at that time is visually read, and the read value is entered in the above table. . This operation is repeated until 1 bar is reached.
[0074]
In this way, in any of the two inspection methods, measurement results can be obtained when the air pressure increases and decreases at six points from 1.00 to 6.00 bar.
[0075]
The above is a case of handwriting an inspection report. As described above, the data of the inspection device 1 is taken into a notebook type personal computer carried with the inspection device 1, and the measurement result is attached to the personal computer. Printing can also be performed using a printer. FIG. 4 shows an example in which the measurement result in the case of the inspection by the inspection method 2 is printed by a printer. In FIG. 4, the measured value at the center and a certain numerical value are data obtained from the pressure indicator. At this time, since there is no visual inspection, it is possible to avoid visual inspection variations between inspectors.
[0076]
Here, it is as follows when the effect of this embodiment is itemized.
[0077]
(1) The tire changer 31 can be inspected and measured by connecting a master gauge (the pressure sensor 9 of the inspector 1) without adding any movement or disassembly.
[0078]
{Circle around (2)} The same pressure can be applied simultaneously to the air gauge 83 (pneumatic gauge 32) provided in the tire changer 31 and the pressure sensor 9 of the inspector 1 serving as a master gauge, thereby improving the measurement accuracy.
[0079]
(3) Compared with the conventional inspection method, it is not necessary to connect the inspection object and the master gauge alternately. Therefore, the inspection time is shortened, and air leaks that cannot be avoided with the conventional inspection method are measured. Errors can be eliminated.
[0080]
(4) Since an external pressure source that maintains a constant pressure may be used as the pressure source, there is no need to provide a pressure vessel in the conventional inspection method.
[0081]
(5) When inspecting at multiple points, it is only necessary to reduce the pressure to a predetermined pressure (pressure to be measured) with the pressure setting device 5, and simply connecting the object to be measured and the master gauge each time because the measurement is performed at multiple points. There is no need to rework, the work required for the measurement can be facilitated and the time required for the measurement can be shortened.
[0082]
(6) The tester 1 is constructed as a whole, and in that case, the size of the main body case 2 is set to be slightly protruding from the palm of one hand, and the weight of the entire tester 1 can be lifted with one hand. And it became a compact tester.
[0083]
(7) For this reason, when a serviceman (inspector) who has signed a maintenance management contract for a tire changer 31 for automobiles with a tire shop or a service factory uses this inspector 1, carry the inspector 1 with him. By going to a contracted tire specialty store or service factory, it is possible to easily inspect the air gauge 83 (pneumatic gauge 32) provided in the automobile tire changer 31 which is a fixed facility. In addition, when a tire specialty store or a service factory is equipped with this inspection device 1, the accuracy of the air gauge 83 of the tire changer 31 can be easily checked in daily work.
[0084]
(8) If the measurement accuracy of the air gauge 83 is confirmed after purchasing the tire changer 31 in this way, the reliability of the customer's tire specialty store and service factory will not be lost, and the tire pressure will be insufficient. It also helps to prevent accidents associated with.
[0085]
{Circle around (9)} The measurement result of the inspection device 1 can be taken out and used as an external output. At this time, it is possible to avoid measurement variations between the inspectors by visual inspection.
[0086]
FIG. 8 is an air piping diagram of the inspection device 1 of another embodiment and corresponds to FIG. 2 of the first embodiment. However, since it is the same as that of 1st Embodiment except a pressure setter, the part of a pressure setter is mainly shown.
[0087]
In the figure, reference numeral 111 denotes a push button type pressure setting device. The flow paths 112a to 112f have six pneumatic passages 4 branched, the passage 113 joins these flow paths into one, and six push buttons 114a to 114f (instruction means) that are equipped on the panel surface 2a and can be manually operated. ), Consisting of a valve group (not shown) for switching the flow paths 112a to 112f in six ways by instructions of these push buttons, and pressure reducing valves 115a to 115f interposed in the flow paths 112a to 112f. Thus, a total of six pressure settings can be made. For example, when the leftmost push button 114a is pressed, only the flow path 112a is pressed, when the adjacent push button 114b is pressed, only the flow path 112b is pressed, and when the adjacent push button 114c is pressed, only the flow path 112c is set. Similarly, when the rightmost push button 114f is pressed, the valve group is switched so that only the flow path 112f communicates, and the pressure reducing valves 115a to 115f are sequentially set to 1.00 bar, 2.00 bar, 3.00 bar, 4 This is achieved by setting the pressures at .00 bar, 5.00 bar, and 6.00 bar. Therefore, if 1.00 to 6.00 bar is displayed on the push buttons 114a to 114f from the left side, the inspector may press one of the push buttons 114a to 114f in accordance with the pressure to be measured.
[0088]
In the second embodiment, it is possible to instantaneously set six discontinuous pressures by operating any of the six push buttons 114a to 114f (instruction means). Therefore, when the air pressure to be measured is determined in advance, the measurement time can be shortened compared to the first embodiment.
[0089]
In the embodiment, the case where the accuracy test is performed on the air gauge 83 itself of the tire changer 31 illustrated in FIG. 5 has been described. However, the connection portion of the air gauge 83, the air tubes 82 and 86 themselves, or the connection portions of the air tubes 82 and 86 are described. Even when there is an air leak, the air gauge 83 shows an incorrect value. In this case, if multipoint measurement is performed, it is considered that the values are lower than the pressure sensor 9 as the master gauge at all points. Therefore, when such a phenomenon occurs, the air gauge 83 is set again. A unit test is performed by removing the tire changer body, and if there is no abnormality in the air gauge 83 in the test, there is an air leak in the connection part of the air gauge 83, the air tubes 82 and 86 themselves or the connection parts of the air tubes 82 and 86. Can be diagnosed.
[0090]
Although the embodiment has been described with a battery capable of storing electricity, the present invention is not limited to this. For example, a disposable dry battery or a commercial power source can be used.
[0091]
In the embodiments, the tire changer for automobiles has been described as an inspection target, but it goes without saying that the present invention can be applied to any pneumatic device including an air pressure gauge such as an air inflator and a tire gauge. In addition, pneumatic equipment is not limited to automobiles, but is also applicable to aircraft and construction machinery.
[Brief description of the drawings]
FIG. 1 is a plan view of an inspection device according to an embodiment.
FIG. 2 is an air piping diagram of the inspection device.
FIG. 3 is an electrical wiring diagram of the inspection device.
FIG. 4 is an example of a pneumatic test report.
FIG. 5 is a schematic perspective view of an automobile tire changer.
FIG. 6 is an explanatory diagram of how to use the tire changer after assembling the tires.
FIG. 7 is a schematic perspective view of a hand inflator.
FIG. 8 is a principal air piping diagram of another embodiment.
1 Inspection device
2 Body case
3 Air connector
4, 6, 7 Pneumatic passage (pneumatic distribution means)
5 Pressure setter (pressure setting means)
8 Air chuck receptacle
9 Pressure sensor (master gauge)
10 Pressure indicator
17 Output connector
21 Pressurized air source
31 Tire changer
32 Air pressure gauge
33 Air chuck (Air connector)
34 Air tube
51 Data processing device
81 Air chuck (Air connector)
82 Air tube
83 Air gauge

Claims (4)

An air connector for connecting to the tire air valve;
A pneumatic equipment inspection device comprising: an air pressure meter for knowing the pressure of air supplied to a tire from the air connector or the air pressure in the tire;
A connection port for introducing pressurized air from a pressure source;
The master gauge
A receptacle for coupling with the air connector;
Pressure setting means for reducing and setting pressurized air from a pressure source introduced from the connection port to a predetermined pressure;
Air pressure distribution means for distributing the pressurized air set to the predetermined pressure to the master gauge and the receiving port,
The pressure setting means includes
A flow path branched into a plurality of passages of pressurized air from the pressure source;
A passage for joining the flow paths into one and connecting the flow paths to the pneumatic distribution means;
Multiple push buttons that can be manually operated,
A valve group for switching the flow path branched in accordance with the instructions of these push buttons in a plurality of ways ;
An inspection apparatus for pneumatic equipment, which is a push-button pressure setting device comprising a pressure reducing valve interposed in each branched flow path .   The apparatus for inspecting pneumatic equipment according to claim 1, wherein the master gauge includes an element for detecting pressure and means for converting the pressure detected by the element into an electric signal and displaying the electric signal.   The apparatus for inspecting pneumatic equipment according to claim 1 or 2, wherein all of the connection port, the master gauge, the receiving port, the pressure setting means, and the air pressure distribution means are integrally and transportable. .   The apparatus for inspecting pneumatic equipment according to claim 2, further comprising a terminal that outputs the electrical signal.

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