JP2001349918A - Cart test apparatus for heating cart and tray test apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cart test apparatus, firstly which can test abnormalities including ones which are generated only when currents are simultaneously carried to three phases and improve the performance, and secondly which is usable simply as a power supply and excellent in the efficiency aspect and the cost aspect, and thirdly, a tray test apparatus which can test trays one by one, and fourthly, need not prepare a large number of trays or carts in advance. SOLUTION: The cart test apparatus 22 can input/output the three-phase AC power source, measures the current consumption by a current measurement unit 23 simultaneously and individually for each of three phases of current to be conducted to a heater of each tray of a heating cart, compares and judges the measured current value with the standard current value by a comparison and judgment unit 24, and displays the total results on a result display unit 25. The tray test apparatus is used together with the cart test apparatus 22, and displays the measured current value of the heater of one tray to be tested together with the mark display of the standard current value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cart testing device and a tray testing device for a heating cart. More specifically, the present invention relates to a cart testing apparatus for electrically testing a service heating cart in which a tray in which a heater is incorporated is stored in multiple stages, and a tray testing apparatus for electrically testing the tray.

[0002]

2. Description of the Related Art For example, a heating cart is conventionally used for providing meals to passengers in an aircraft, and trays are provided in the heating cart as shelves which can be freely taken in and out. It is stored. Each of these trays has a built-in heater, which cooks the food in the tableware.
Keep warm. By the way, a test before use during the operation of such a heating cart, that is, a test to be performed beforehand on the ground before use on whether or not each stored tray operates normally, has conventionally been performed on each tray. The stored heating cart is connected to a cart test device as it is, and is energized, and the power consumption is measured. That is, the connector for the power supply of the heating cart is connected to the cart test device, and each tray stored in the heating cart is energized and heated, so that the measured current value is within the standard current value (for example, 8A to 10A). It was determined whether the test passed or not by comparing the presence or absence.

[0003]

The following problems have been pointed out in such a conventional example. This kind of heating cart uses a phase alternating current power supply in view of being used in an aircraft, for example.
The power supply circuit is a three-phase four-wire system (one line is a neutral line). On the other hand, in the conventional cart test apparatus of this type, a general single-phase AC power supply is used on the ground in view of being used on the ground. Therefore, a test before using the heating cart on the ground was performed individually for each single phase using such a cart test device.
That is, for the connector for the power supply of the heating cart, each of the three pin terminals corresponding to the three phases is individually and sequentially sequentially transmitted through the cart test device.
A single-phase AC power supply of V or 200 V is connected and energized to heat the corresponding trays of the heating cart, and it is determined whether the measured current value is within the specified current value for each of the three phases. And a cart test device to determine whether the heating cart electrically operates normally or not.

Therefore, first, in the test system using the cart test apparatus of this type, there is a problem that an abnormality between the phases cannot be found and is overlooked. With the conventional cart testing device of this type, if the current is passed sequentially for each of the three phases, even if the test passes, if all the phases are energized at the same time, an abnormality occurs in all or any of the phases. There was a problem with the performance of the cart test equipment. That is, in this kind of heating cart, the three-phase four-wire power circuit from each pin terminal of the power connector has three power lines corresponding to three phases.
It is connected to a common neutral line by a noise filter (resistor or capacitor) for electromagnetic wave interference measures installed in the branch. In other words, in the heating cart,
The three-phase power lines are not completely independent of each other, but are connected to each other via a noise filter or the like, and have an influential relationship. Therefore, there is also an abnormality between three phases that occurs only when the three phases are simultaneously energized by the three-phase AC power supply, and a single-phase alternating current is individually and sequentially applied to each of the three phases for testing. The cart test apparatus of No. could not detect the abnormality between the three phases, and pointed out a problem in performance.

Second, regarding the heating cart,
As part of the pre-use test, a use test using a three-phase AC power supply was also performed. In other words, apart from the operation test using the cart test device described above, a power supply device prepared separately is connected to a three-phase AC power source, energized, and then the heating cart is actually used. It was done. Therefore, regarding the test before using the heating cart, a cart test device for operation test,
It was necessary to prepare a power supply unit for use test, and problems were pointed out in terms of efficiency and cost.

In view of such circumstances, a cart test apparatus according to the present invention has been made to solve the above-mentioned problems of the prior art, and can input and output a three-phase AC power supply. (3) While conducting the three phases simultaneously, the measured current value of each phase and the standard current value are compared and determined, and a comprehensive test result is displayed. First
Secondly, it is an object of the present invention to propose a cart test device which has improved performance and is secondly excellent in efficiency and cost. Further, the tray test apparatus according to the second aspect of the present invention is used together with such a cart test apparatus, and displays the measured current value of the heater of one tray to be tested together with the mark display of the specified current value. Characterized in that: Thirdly, the trays can be individually tested one by one, and fourthly, it is possible to specifically determine which tray has a defective heater, and it is not necessary to prepare a large number of spare trays and carts in advance. It is an object to propose a tray test device.

[0007]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. The cart test apparatus according to the present invention electrically tests a heating cart for service. That is, a three-phase AC power supply is provided in which a tray is housed in a multistage as a shelf which can be taken in and out, and a heater is incorporated in the tray so that the food in the tableware can be cooked and kept warm. Electrically test the heating cart for the service used.
The cart test apparatus can input a three-phase AC power supply and can output the power to the heating cart side, and includes a next current measuring unit, a comparison determining unit, a result display unit, and the like. Become. That is, a current measuring unit which is disposed between the input connector and the output connector and measures current consumption by energizing the heaters and the like of each tray for each of the three phases, and a current value measured by the current measuring unit for each of the three phases. A comparison determination unit that compares and determines the standard current value, a result display unit that displays a determination result by the comparison determination unit whether the measured current value is within the standard current value for all three phases,
It is characterized by having.

[0008] The cart test apparatus according to the present invention has the following configuration. Three-phase AC power supply
It is connected to a heating cart via an input connector and an output connector, and energizes and heats the heater of each stored tray. At the same time, the current consumption is measured by the current measurement unit for each of the three phases, and the comparison and determination unit compares and determines the measured current value with the standard current value which is an allowable value. In this type of heating cart, the three phases are connected to each other via a noise filter etc.
The measured current value can include an abnormality between the three phases that occurs only when the three phases are energized simultaneously. Then, for all three phases, whether or not the measured current value is determined to be within the specified current value in the comparison determination unit is displayed on the result display unit, and the heating cart that has been tested is electrically normal. It becomes clear whether or not to operate.
Further, the cart test apparatus can be used as a power supply apparatus that simply supplies three-phase AC power to the heating cart.

Next, claim 2 is as follows. The tray test apparatus of the present invention electrically tests a tray stored in a heating cart. That is,
The trays that are housed in multiple levels as shelves that can be taken in and out of a service heating cart and that incorporate a heater and that heat and cook food in the placed tableware are electrically tested. The tray test apparatus is formed in a box shape, and the trays can be stored one by one as a test target, and a current measuring unit for measuring a current consumption by energizing the heater for the test target tray; A result display unit displaying a current value measured by the current measuring unit and a mark display of a standard current value. In this way, the result display unit enables comparison and determination between the measured current value and the standard current value.
In addition, the tray testing device is characterized in that the heating cart in which the trays are stored in multiple stages is selectively used in combination with a cart testing device that electrically tests the heating cart as it is.

[0010] The tray test apparatus according to the present invention has the following configuration. First, the heater is energized and heated for the tray taken out of the heating cart and stored as a test object, the current consumption is measured by the current measuring unit, and the measured current value is displayed by the result display unit. Therefore, by looking at the result display section, it can be determined whether or not the measured current value satisfies the standard current value, which is the permissible value marked, and the test target tray operates normally electrically. Or not. By the way, the efficiency of the test is improved by combining the tray test apparatus with the cart test apparatus described above. For example, as a result of the test using the cart testing device described above, by testing each tray stored in the heating cart using the tray testing device for a heating cart that has failed,
The defective tray that caused the heating cart to fail can be found, and only that tray needs to be replaced. On the other hand, if only a cart test device is used, the heating cart that failed the test must be replaced as it is.In operation, a large number of spare heating carts containing trays must be prepared in advance. You need to prepare.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. 1 and 2
FIG. 1 provides a description of an embodiment of a cart testing apparatus for a heating cart according to the present invention. FIG. 1 is a front view, and FIG. 2 is a block diagram of a circuit. FIG. 3 provides a description of an embodiment of the invention for a tray testing apparatus for a heating cart according to the present invention. FIG. 3A is a front view, and FIG. 3B is a block diagram of a circuit. FIG. 4, FIG. 5, and FIG.
(1) is a plan view of one example of the tray, (2) is a plan view of another example of the tray, and (3) is a front sectional view of a main part of the heating cart. It is. FIG. 5 is a process perspective view of an example of a meal providing service using a tray, and FIG. 6 is a perspective view of a heating cart.

<< About the heating cart 1 >>
The heating cart 1, which is a heating type cart, will be described with reference to FIGS. The heating cart 1 is used when providing services such as meals to passengers, for example, on an airplane or a bullet train, and is provided with a door 2.
And casters 3, which are pushed by hand, moved, transported, and stored as appropriate. Heating cart 1
It is provided with a top plate 4, a floor plate 5, left and right side plates 6, a rear plate 7, etc., and has a box shape. The door 2 is attached to the front surface, and the casters 3 are attached to four lower corners of the floor plate 5. The top plate 4, floor plate 5, side plate 6, rear plate 7, door 2 and the like each have a panel structure made of a heat insulating material, and each of the light metal corner members arranged as a frame vertically and horizontally, that is, up and down, left and right, front and back, etc. , Is assembled. In the example of FIG. 6, the rear plate 7 (see FIG. 5)
And a door 2 is provided in place of the door 2.

Guide rails 8 for receiving trays are provided on the inner surfaces of the left and right side plates 6 of the service heating cart 1.
However, they are fixed in upper and lower tiers while facing each other at the same height level. A large number of substantially flat trays 9 are held between the left and right guide rails 8 as shelves that can be freely taken in and out. In other words, the trays 9 are mounted and stored in the heating cart 1 as shelves which can be put in and out of the heating cart 1 in upper and lower stages. Each tray 9 is made of resin,
Each is provided with a heater plate portion 10 made of light metal, and the heater plate portion 10 incorporates a planar heater 11 that generates heat when energized. The heater plate 10 heats and cooks the meal in the cathay roll placed thereon, that is, the food 13 in the tableware 12. Food 13 includes cooking, other side dishes, rice,
Ingredients such as noodles, pasta and bread are considered, and heater 1
Due to the heat generated in 1, heating is simply performed, heating is performed and the temperature is kept afterwards, the food that has been separately heated is heated, or the food that has been separately heated is further cooked. Or various patterns can be considered.

In FIG. 6, reference numeral 14 denotes a cart-side connector attached to the upper portion of the heating cart 1. The cart-side connector 14 is connected to an external power supply-side connector 15, for example, on the aircraft side, thereby heating the cart. The internal wiring of the cart 1, its contact terminals (not shown) having a pantograph structure, the contact terminals 16 serving as contact portions on the tray 9 side, and the wiring 17 inside the tray 9 (see FIGS. 4A and 4B). ), Etc., the heater plate portion 10 of each tray 9
Power is supplied to the heater 11 and the heater 11 can be energized and generate heat. In the figure, reference numeral 18 denotes a stopper. The stopper 18 is provided in a rib shape around the heater plate 10 of the tray 9, and the tableware 12 placed on the heater plate 10 is used for the heating cart 1. When moving or transporting, regulate so that it does not shift, move, fall or fall. Conventionally, as the heater 11 of the tray 9, the resistance heater A with the thermostat 19 shown in FIG. 4 (1) was used, but in addition to this, in the future, FIG. The PTC (Positive Temperature Coeff) of the self-temperature control type without using the thermostat 19 is shown.
icient) Use of heater B is also expected

By the way, for example, in an airplane, a generator at 115 V and 40 V
0H 3-phase AC and power source are used in _Z, flight of the AC power supply circuit consists of a three-phase four-wire system. Therefore, in order to use a three-phase AC power supply for this kind of heating cart 1 as well, the power supply wiring of the power supply circuit is composed of a three-phase four-wire system, and a three-phase power supply line corresponding to three phases and a load balance therebetween. And a neutral wire for adjustment and holding. The three-phase four-wire power supply circuit connected to each pin terminal of the cart-side connector 14 passes through a noise filter,
Contact terminal 16 and the heater 11.

The noise filter is interposed from the viewpoint of countermeasures against electromagnetic interference (EMI) in the machine due to the heater 11 and the like. A coil with a magnetic material for noise reduction is provided on each of the three power lines. With intervening,
A resistor and a capacitor for noise reduction are respectively branched and interposed between the three power lines and the neutral line and the ground. That is, the three-phase power lines to which power is independently supplied are once connected to each other via a resistor, a capacitor, a neutral line, and the like at the noise filter. Each power line is thereafter independently connected to the tray 9 and the heater 11 of each block.

The heating cart 1 is used as shown in FIG. First, in each step, the tableware 12 containing the food 13 is placed on the heater plate unit 10 for each prepared tray 9 in each step. In this step, the trays 9 on which the dishes 12 of the food 13 are placed are stored in the heating cart 1 in multiple stages, and the food 13 is heated and cooked by the energization and heat generation of the heater 11 of the heater plate unit 10. ， It is kept warm. Then, in a step, each tray 9 is taken out of the heating cart 1 that has been moved and transported by disconnecting the power supply. At that time, each tray 9 taken out
The tableware 21 of vegetables and other foods 20 may be placed as needed next to the tableware 12 of the food 13 that has been cooked and kept warm.
And a knife, a fork, chopsticks, a napkin, and other tools. The tray 9 on which the foods 13 and 20 for one meal are placed is served for serving to passengers and the like in steps. The heating cart 1 is like this.

<< Cart Testing Apparatus 22 >> Next, the cart testing apparatus 22 will be described with reference to FIGS. The cart testing device 22 electrically tests the above-described heating cart 1 for service. The heating cart 1 stores therein a tray 9 in multiple stages as a shelf that can be taken in and out, and the tray 9 incorporates a heater 11 so that the food 13 in the placed tableware 12 can be cooked and kept warm. And a 115 V three-phase AC power supply is used. The cart test device 22 is capable of inputting a three-phase AC power supply and outputting the power to the heating cart 1, and includes a current measuring unit 23, a comparison determining unit 24, a result display unit 25, and the like. Do it. Hereinafter, these will be described in detail.

The input connector 26 of the cart test device 22
Is connected to an external 200 V three-phase AC power supply, and the output connector 27 is connected to the cart side connector 14 of the heating cart 1 (see FIG. 6), and outputs a 115 V three-phase AC. The input connector 26 and the output connector 27
As shown in FIG. 2, the three wires corresponding to the three phases between them include a power switch 28, a transformer 29, and a relay contact 3 respectively.
0, a current measurement unit 23, and the like are interposed in order, and a current display unit 31, a comparison determination unit 24, a result display unit 25, and the like are branch-connected to each current measurement unit 23, respectively. Further, as shown in FIG. 1, a mode changeover switch 32 and a timer setting unit 3 are attached to the cart testing device 22.
3, 34, start switch 35, reset switch 3
6, etc. are provided.

First, the power switch 28 is constituted by a breaker switch, functions as a main switch of the cart test device 22, and is interposed between the input connector 26 and the transformer 29. The transformer 29 functions to convert a 200 V three-phase AC delta-type power supply input and taken in from the input connector 26 into a 115 V three-phase AC star-type power supply for output. Are provided. Unlike an aircraft, a three-wire 200 V three-phase AC power supply is usually used on the ground. The mode switch 32 switches whether the cart test device 22 is used simply as a power supply device or as a tester for testing. That is, the cart test apparatus 22 is set to a power supply mode in which the cart test apparatus 22 is used only as a power supply apparatus that only supplies a three-phase alternating current of 115 V to the heating cart 1 (the heater 11 of each tray 9 of the heating cart 1), or in addition to this, , Comparison determination unit 24 and result display unit 25
And the like, and the heating cart 1 (each tray 9)
The mode changeover switch 32 allows the user to select whether the test mode is used to test the heater 11). As described above, the cart test apparatus 22 can be used for two kinds of purposes, namely, a power supply mode used simply for powering the heating cart 1 and a test mode used for testing the heating cart 1. is there.

The timer setting section 33 is used to set a use time (cooking time) when used in the power mode, whereas the timer setting section 34 is used.
Is used to set a use time (test time) when used as a test mode. When the start switch 35 is pressed, the power mode or the test mode is specifically started, and when the reset switch 36 is pressed, the test mode is reset to a standby state, and the display of the result display unit 25 is turned off. As the relay contact 30, for example, a solid state relay SSR is used,
There are three start switches 35 corresponding to the respective phases.
Assuming that the button is pressed, the timer setting sections 33 and 34
Off is controlled.

Next, the current measuring section 23 detects the heater 1 of each tray 9 of the heating cart 1 for each of the three phases.
It functions to measure power consumption by energizing 1 and the like, and three ammeters are connected to correspond to three phases. Current display 3
1 functions to display the measured current value flowing in each phase measured by the current measuring unit 23 for each of the three phases,
As a current monitor, a measured current value is digitally displayed, and three digital meters corresponding to three phases are used. The comparison determination unit 24 determines the current measurement unit 2 for each of the three phases.
The measured current value measured in step 3 is compared with the standard current value. This standard current value is set in advance as an allowable value having a width, and using an attached digital switch,
The LOW standard value is set to, for example, 8A, and the HIGH standard value is set to, for example, 10A. As the comparison determination unit 24, three comparators corresponding to three phases are used. For each of the three phases, it is determined whether or not the actual measured current value is within a standard current value which is an allowable value. I do.

The result display section 25 functions to display a result of determination as to whether or not the measured current value is within the specified current value. In the illustrated example, each phase result displays the result of determination for each of the three phases. The display 37 includes a display 37 and an overall result display 38 for displaying a determination result obtained by integrating three phases. First, three phase result displays 37 are provided corresponding to the three phases. For each of the three phases, the determination result of the comparison determination unit 24 as to whether or not the measured current value satisfies the specified current value is displayed. If not, the LOW standard value is not satisfied.
Whether the GH standard value is not satisfied or both of them is also displayed. The overall display result 38 includes an OK lamp 39 using LEDs and an NG lamp 40, and when the measured current values satisfy the standard current values for all three phases,
When the OK lamp 39 is turned on and the measured current value does not satisfy the specified current value even in one of the three phases, the NG lamp 40 is turned on.

Incidentally, the current measuring section 23 and the current display section 3
1, the comparison / determination unit 24, the result display unit 25, and the like have been described as separate components in the above-described places. However, a configuration in which some or all of them are combined as appropriate can be used. For example, for each phase, first, the current measurement unit 23 and the current display unit 31
Is often integrally configured as a so-called ammeter, and a configuration in which the comparison and determination unit 24 is integrated therewith can be considered as a member. Further, each phase result display 37 of the result display unit 25 is also provided. An integrated configuration is also possible. That is, for each phase, a configuration in which the current measurement unit 23, the current display unit 31, the comparison determination unit 24, each phase result display unit 37, and the like are appropriately combined can be used. Further, if a microcomputer or the like is used, it is possible to share the configuration between the phases together with such a combined configuration. In FIG. 1, reference numeral 41 denotes a lamp under test which lights during the test, and reference numeral 42 denotes a caster.

The cart test device 22 performs a test as follows. First, the input connector 26 is connected to an external power supply, and the output connector 27 is connected to the cart side connector 14 of the heating cart 1 (see FIG. 6).
Connect to Then, the test mode is selected by the mode changeover switch 32, the test time is set by the timer setting section 34, and the power switch 28 is turned on. Then, after appropriately pressing the reset switch 36 and then pressing the start switch 35, the heaters 11 of each tray 9 of the heating cart 1 are all energized and heated at the same time. Then, the momentarily measured current value by the current measuring unit 23 is sequentially displayed on the current display unit 31 and is sequentially compared with the standard current value by the comparison determining unit 24, and the determination result is displayed on the result display. It is displayed on each phase result display 37 and the overall result display 38 of the section 25. That is, in the overall display result 38 of the result display unit 25,
The OK lamp 39 or the NG lamp 40 is turned on. In addition,
When the OK lamp 39 is turned on, the test is continued for the timer set time. On the other hand, when the NG lamp 40 is turned on, the energization of the heating cart 1 and the test are interrupted, and this state is continued until the reset switch 36 or the start switch 35 is pressed. In this way, it is tested whether the heating cart 1 operates normally electrically.

On the other hand, this cart testing device 22
If you simply use it as a power supply: That is, first, after connecting the input connector 26 and the output connector 27 according to the above-described point,
The power supply mode is selected by the mode changeover switch 32, the use time (cooking time) is set by the timer setting section 33, and the power supply switch 28 is turned on. Then, by depressing the start switch 35, the heater 11 of each tray 9 of the heating cart 1 is energized and heated for a timer set time. In this case, the current value measured by the current measurement unit 23 is displayed on the current display unit 31, but the comparison determination unit 24 and the result display unit 25 do not function. The cart testing device 22 is configured as described above.

<< Tray Test Apparatus 43 >> Next, the tray test apparatus 43 will be described with reference to FIG. The tray test device 43 electrically tests the tray 9.
The trays 9 are housed in multiple stages as shelves that can be taken in and out of the service heating cart 1 and have a heater 11 incorporated therein for heating and heating the food 13 in the placed tableware 12. And tray testing device 4
Reference numeral 3 denotes a box shape, and the tray 9 can be stored as a test object one by one.
And 5. Hereinafter, these will be described in detail.

First, the tray test device 43 is formed in a box shape, and has a tray storage portion 46 opened on the front surface. One tray 9 can be stored inside the tray storage portion 46 as a test object. ing. 47 is a power switch,
When the power switch 47, which is the main breaker switch, is turned on, the heater 11 of the tray 9 stored in the tray storage section 46 is energized and generates heat, and a test is enabled. The energization of the tray 9 is performed by using the contact terminal 48 provided inside the tray accommodating portion 46 and via the contact terminal 16 on the tray 9 side (see also FIGS. 4A and 4B). Will be A single-phase AC power supply of 100 V or 115 V is used as a power supply for the tray test device 43, and a power supply switch 47, a relay contact 50, and a current measuring unit are provided in an energizing circuit between an external outlet 49 and a contact terminal 48. 44, etc. are sequentially interposed, and the current measuring unit 44
The result display unit 45 is branched and connected. Further, a timer setting unit 51 is attached to the tray testing device 43.
And a protector switch 52 are provided.

The timer setting section 51 is used to set a test time and a cooking time. The timer setting section 51 can set a maximum of three minutes for one tray 9 and controls ON / OFF of the relay contact 50. The protector switch 52 is composed of a circuit protector switch for protection against overcurrent, and its sensitive current is, for example, 3
A, and when the switch is on, tray 9
When the current value of the current consumption exceeds 3 A, a switching operation is performed, and the power supply circuit is interposed to cut off the power supply to the tray 9.

The current measuring section 44 comprises an ammeter for measuring the current consumption of the tray 9 to be tested by energizing the heater 11. The result display section 45 displays the current value measured by the current measurement section 44 and is provided with a mark display 53 of the standard current value. Although the current measurement unit 44 and the result display unit 45 have been described above as separate components,
Of course, in many cases, an integrally configured member is used. The result display unit 45 in the illustrated example displays the measured current value in an analog manner with a pointer 54 in a meter display, and the standard current value is marked as a mark display 53 on a scale display surface 55 thereof. The standard current value is, for example, 2.2 A or more.
It has an allowable value having a width of about 2.8 A, and is added as a mark display 53 on the scale display surface 55. In the drawing, reference numeral 56 denotes a power lamp for a monitor that is turned on when the power switch 47 is turned on. Reference numeral 57 denotes a light that is turned on only during the test in which the tray 9 is inserted into the tray storage unit 46. It is a lamp. Then, on the front panel surface of the tray test device 43, the opening of the tray storage section 46, the power switch 47, the power lamp 56, the protector switch 52, the timer setting section 51, the test lamp 57, etc. A result display unit 45 including a scale display surface 55, a mark display 53, and the like are provided.

The tray test device 43 performs a test as follows. First, the external outlet 4
9 and a timer setting unit 5
Set the test time with 1 and set the protector switch 5
2 and the power switch 47 is turned on. At the same time, one tray 9 is stored in the tray storage section 46 as a test target. Then, the lamp 57 is turned on during the test, the heater 11 of the stored tray 9 is energized and heated, and the timer starts. Then
The current value measured every moment by the current measuring unit 44 is sequentially displayed on the result display unit 45. Then, the operator looks at the result display section 45, compares the displayed measured current value with the specified current value indicated by the mark display 53, and determines that the measured current value of the heater 11 of the tray 9 is equal to the specified current value. It is determined whether or not the condition is satisfied. When the timer set time elapses, the power supply to the tray 9 ends, and the test lamp 57 is turned off. In this way, it is tested whether the heater 11 of the tray 9 operates normally electrically. The tray testing device 43 is selectively used in combination with the above-described cart testing device 22 that electrically tests the heating cart 1 in which the trays 9 are stored in multiple stages. The tray test device 43 is configured as described above.

<< Operation of Cart Test Apparatus 22 >>
The present invention is configured as described above, and is as follows. First, the operation and the like of the cart test device 22 will be described. In the heating cart 1, a large number of trays 9 are stored in multiple stages as shelves that can be taken in and out (see FIGS. 4, 5, and 6). For example, the heating cart 1 for an aircraft is used. During the actual operation of the, each time the use, the test performed before use on the ground,
Using the cart test device 22, the test is performed as follows.

First, the three-phase AC power is supplied to the cart tester 22.
Is connected to the heating cart 1 to be tested through the input connector 26 and the output connector 27 of the heater 1 and the heater 1 of each tray 9 stored in the heating cart 1.
1 is energized and heated (see FIG. 1). Then, in the cart testing device 22, for each of the three phases energized to the heater 11 of each tray 9 of the heating cart 1, the current measuring unit 23 simultaneously and individually measures the current consumption of each of the three phases. Then, the measured current value and the standard current value are compared and determined (see FIG. 2). That is, for each of the three phases, the actual measured current value by the current measuring unit 23 is
It is determined whether or not a standard current value (for example, 8A to 10A) which is an allowable value having a width set in advance in the comparison determination unit 24 is satisfied.

Therefore, the cart testing device 22 operates in the following first and second cases. First, in this kind of heating cart 1, the three-phase power lines are connected to each other via a noise filter or the like so that they have an influence on each other. The current value of each of the three phases is measured by the current measuring unit 23 corresponding to the three phases while simultaneously energizing the three phases. Thus, the current value measured by the current measuring unit 23 can include an abnormality between the three phases that occurs only when the three phases are simultaneously energized. Therefore, in the comparison determination unit 24, such a measured current value is compared with the standard current value, so that more accurate determination is possible. And for all three phases,
Whether or not all the measured current values are determined to be within the specified current value by the comparison determination unit 24 is displayed on the OK lamp 39 or the NG lamp 40 of the overall display result 38 of the result display unit 25. In this way, it is accurately determined whether or not the heating cart 1 to be tested operates electrically normally.

Second, the cart test device 22 can be used as a power supply device for simply supplying three-phase AC power to the heating cart 1 without performing such a test by the mode changeover switch 32. It is. That is, as described above, the cart testing device 22 can be used to test whether the heating cart 1 electrically operates normally, and the cart testing device 2 can be used.
It is also possible to use 2 for supplying three-phase AC power to the heating cart 1 and merely for actual use. The cart test apparatus 22 operates as described above.

<< Operation of Tray Test Apparatus 43 >>
Next, the operation of the tray test device 43 and the like will be described. In the heating cart 1, a large number of trays 9 are stored in multiple stages as shelves that can be taken in and out (see FIGS. 4, 5, and 6). For example, the heating cart 1 for an aircraft is used. In the actual operation of the device, a test performed before use on the ground every time the device is used is performed as follows by using the tray test device 43. First, the trays 9 are taken out of the heating cart 1 and stored in the tray test device 43 one by one as test objects. In the tray testing device 43, the heater 11 of the tray 9 to be tested is energized and heated, and the current consumption of the tray 9 is measured by the current measuring unit 44.
The measured current value is displayed on the result display section 45, and the standard current value is indicated on the result display section 45 by the mark display 53.

Now, the tray test apparatus 43 operates in the following third and fourth modes. Third, in the tray test apparatus 43, by checking the result display section 45, it is determined whether or not the measured current value satisfies a standard current value (for example, 8A to 10A) which is an allowable value having a width. Can be easily determined, and it is determined whether or not the test target tray 9 electrically operates normally. By using the tray testing device 43, the trays 9 for the heating cart 1 can be tested one by one in this manner.

Fourth, the tray testing apparatus 43 can test the tray 9 alone as described in the third aspect above, and the electrical operation of each heater 11 of one specific tray 9 is normal. Since it is possible to determine whether or not there is a test, the efficiency of the test can be increased by using the heating cart 1 in combination with the above-described cart test device 22 in a test before use during operation. For example, first, each heating cart 1 is tested in a state in which a large number of trays 9 are stored using the above-described cart testing device 22. As a result, using only the heating cart 1 that failed the test, the tray testing device 43 is used to test each tray 9 stored in the heating cart 1 one by one. A defective tray 9 that has caused the heating cart 1 to fail can be found. Thus, only the defective tray 9 needs to be replaced. In other words, the heating cart 1 rejected in the test by the cart testing device 22 can be used as it is, only by replacing a part of the trays 9.

On the other hand, when only the above-described cart test device 22 is used without using the tray test device 43, the heating cart 1 which has failed as a result of the test is used.
Needs to replace the entire heating cart 1 without discriminating the tray 9 that caused the problem (specifically, which tray 9 was defective). In other words, the failed heating carts 1 are exchanged one after another. In view of the use situation of the heating cart 1 in an aircraft, there is a case where promptness is required in operation, and a large number of spare heating carts 1 containing a large number of spare trays 9 are prepared in advance. It becomes necessary. At present, such a large number of spare heating carts 1 are prepared in advance at each airfield or the like. However, such a situation can be solved by using the cart testing device 22 and the tray testing device 43 together. Is done.
The tray test device 22 operates in this manner.

[0040]

As described above, the cart test apparatus according to the first aspect of the present invention is capable of inputting / outputting a three-phase AC power source and simultaneously supplying current to the three phases while simultaneously measuring the measured current value of each phase. The following effects are exhibited by comparing and judging the standard current value and displaying a comprehensive test result.

First, the performance is greatly improved. In this cart test device, the heaters of each tray stored in the heating cart are energized by using a three-phase AC power supply, and the three phases are simultaneously and individually tested. The total result of the test is displayed, and it is determined whether the heating cart as a test target electrically operates normally. In this cart test apparatus, when conducting a test before each use during the operation of the heating cart, the three-phase alternating current includes three-phase alternating current, which includes an abnormality between the phases that occurs only when three phases are simultaneously energized. In comparison with the above-described conventional example in which such an abnormality could not be found, the performance is improved accordingly.

Second, it is excellent in efficiency and cost. As described above, an operation test is performed using the cart test device to determine whether or not the heating cart normally operates electrically. Further, the cart test device is simply used as a power supply device, A usage test is also possible, in which three-phase AC power is supplied to the heating cart to actually use it. In this way, in the test before each use in the operation of the heating cart, both the operation test and the use test can be performed with one cart test device, and the cart test device and the power supply device are prepared respectively. This is superior in efficiency and cost as compared with the above-described conventional example.

A tray test apparatus according to a second aspect of the present invention is used in combination with the above-described cart test apparatus, and displays a measured current value of a heater of one tray to be tested together with a mark display of a standard current value. By doing so, the following effects are exhibited.

Third, trays can be tested individually one by one. In this tray test apparatus, the tray passed the test by comparing the display of the measured current value of the heater and the mark display of the standard current value for one tray to be tested taken out of the heating cart. Can be determined one by one. In addition, unlike a general ammeter, a dedicated mark is displayed, so that pass / fail can be easily determined.

Fourth, more specifically, it is possible to determine which tray has a defective heater, and it is not necessary to prepare a large number of spare trays and carts in advance. That is, by using the tray test apparatus, the tray can be tested as a single unit as described above, and it can be determined whether each tray is normal or not. Therefore, the efficiency of the test is improved by using the heating cart in combination with the cart test device according to the above-described claim 1 in the test before each use during operation of the heating cart. In other words, rejected / defective trays and heating carts containing the trays can be found quickly and efficiently, and in operation, the number of spare trays that must be prepared in advance and spare heating The number of carts is reduced accordingly, and it is economical. As described above, the effects exhibited by the present invention are remarkable and large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of the drawings]

FIG. 1 is a front view for explaining an embodiment of a cart testing apparatus for a heating cart according to the present invention.

FIG. 2 is a block diagram of a circuit used for describing an embodiment of the present invention.

FIG. 3 provides a description of an embodiment of a heating cart tray test apparatus according to the present invention, (1)
The figure is a front view, and the figure (2) is a block diagram of a circuit.

FIG. 4 is a plan view of one example of a tray;
FIG. 2B is a plan view of another example of the tray, and FIG. 3C is a front sectional view of a main part of the heating cart.

FIG. 5 is a process perspective view illustrating an example of a meal providing service using a tray.

FIG. 6 is a perspective view of a heating cart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating cart 9 Tray 11 Heater 12 Tableware 13 Food 22 Cart test device 23 Current measurement unit 24 Comparison judgment unit 25 Result display unit 26 Input connector 27 Output connector 43 Tray test device 44 Current measurement unit 45 Result display unit 53 Mark display

Claims (2)

[Claims] 1. A tray is housed in multiple stages as a shelf which can be taken in and out freely, a heater is incorporated in the tray, and the food in the tableware placed can be cooked and kept warm. A cart testing apparatus for electrically testing a heating cart for a service using a three-phase AC power supply, which is capable of inputting a three-phase AC power supply and outputting to the heating cart side, A current measuring unit which is disposed between the input connector and the output connector and measures current consumption due to energization of a heater or the like of each tray for each of the three phases; a current value measured by the current measuring unit and a standard current value for each of the three phases And a result display unit for displaying the determination result by the comparison determination unit as to whether or not the measured current value is within the standard current value for all three phases. And a cart testing device for a heating cart. 2. A tray which is housed in multiple stages as shelves which can be taken in and out of a service heating cart, has a built-in heater, and heats and heats the food in the placed tableware. A tray testing device for testing, wherein the tray is box-shaped, and the trays can be stored one by one as a test target, and a current measuring unit for measuring a current consumption by energizing the heater for the tray as a test target. And a result display unit that displays a current value measured by the current measuring unit and is provided with a mark of the standard current value, so that the result display unit allows the measurement current value and the standard current value to be compared with each other. And the tray test apparatus electrically tests the heating cart containing the trays therein in multiple stages. A tray testing device for a heating cart, which is selectively used in combination with a testing device.