CN113482986B - Fault detection circuit and equipment of hydraulic control valve - Google Patents
Fault detection circuit and equipment of hydraulic control valve Download PDFInfo
- Publication number
- CN113482986B CN113482986B CN202110698064.3A CN202110698064A CN113482986B CN 113482986 B CN113482986 B CN 113482986B CN 202110698064 A CN202110698064 A CN 202110698064A CN 113482986 B CN113482986 B CN 113482986B
- Authority
- CN
- China
- Prior art keywords
- plug
- change
- over switch
- contact
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Abstract
The invention is suitable for the technical field of hydraulic pressure, and provides a fault detection circuit and equipment of a hydraulic control valve, wherein the fault detection circuit comprises: the device comprises a fault judgment module, a signal switching module, a signal adjusting module and two plugs; the two plugs comprise a first plug and a second plug, and the first plug is connected with the second plug; the fault judgment module is respectively connected with the signal switching module, the signal adjusting module, the first plug and the second plug, the signal switching module is further connected with the first plug and the signal adjusting module, and the signal adjusting module is further connected with the second plug. The failure point of the hydraulic control valve can be directly judged through the ammeter and the voltmeter indicating number in the failure judging module of the hydraulic control valve, so that the hydraulic control valve is convenient to operate and high in efficiency.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure, and particularly relates to a fault detection circuit and equipment of a hydraulic control valve.
Background
The hydraulic control valve controls and adjusts the flow direction, pressure and flow of oil in the hydraulic system, so that the actuator and the working mechanism driven by the actuator obtain the required movement direction, thrust, movement speed and the like. The hydraulic control valve is an indispensable device in the hydraulic system, and the work of the whole hydraulic system can be influenced by the failure of the hydraulic control valve.
At present, a manual checking method is generally adopted to detect the fault of the hydraulic control valve, and mainly checks whether a connector lug of the hydraulic control valve is loosened, whether a component of the hydraulic control valve is damaged, whether a valve core of the hydraulic control valve is blocked, and the like.
However, the above-described failure detection method of the hydraulic control valve has a problem of low efficiency.
Disclosure of Invention
In view of this, embodiments of the present invention provide a fault detection circuit and a fault detection device for a hydraulic control valve, so as to solve the problem of low efficiency of a fault detection method for a hydraulic control valve in the prior art.
A first aspect of an embodiment of the present invention provides a fault detection circuit for a hydraulic control valve, including:
the device comprises a fault judgment module, a signal switching module, a signal adjusting module and two plugs;
the two plugs comprise a first plug and a second plug, and the first plug is connected with the second plug;
the fault judgment module is respectively connected with the signal switching module, the signal adjusting module, the first plug and the second plug, the signal switching module is further connected with the first plug and the signal adjusting module, and the signal adjusting module is further connected with the second plug.
A second aspect of embodiments of the present invention provides an apparatus including at least the failure detection circuit of the hydraulic control valve of the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the fault detection circuit of the hydraulic control valve of the embodiment of the invention comprises: the device comprises a fault judgment module, a signal switching module, a signal adjusting module and two plugs; the two plugs comprise a first plug and a second plug, and the first plug is connected with the second plug; the fault judgment module is respectively connected with the signal switching module, the signal adjusting module, the first plug and the second plug, the signal switching module is further connected with the first plug and the signal adjusting module, and the signal adjusting module is further connected with the second plug. The failure point of the hydraulic control valve can be directly judged through the ammeter and the voltmeter indicating number in the failure judging module of the hydraulic control valve, so that the hydraulic control valve is convenient to operate and high in efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a fault detection circuit of a hydraulic control valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fault detection circuit for a hydraulic control valve according to an embodiment of the present invention;
fig. 3 is a front view of an apparatus provided by an embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic structural diagram of a fault detection circuit of a hydraulic control valve according to an embodiment of the present invention. As shown in fig. 1, a failure detection circuit of a hydraulic control valve of this embodiment includes:
the system comprises a fault judgment module 110, a signal switching module 120, a signal adjusting module 130 and two plugs;
the two plugs comprise a first plug and a second plug, and the first plug is connected with the second plug;
the failure determination module 110 is connected to the signal switching module 120, the signal adjustment module 130, the first plug, and the second plug, respectively, the signal switching module 120 is further connected to the first plug and the signal adjustment module 130, and the signal adjustment module 130 is further connected to the second plug.
In an embodiment, with reference to fig. 1 and fig. 2, the failure determination module 110 includes: the first conversion switch SA1, two voltmeters including a first voltmeter V1 and a second voltmeter V2, and two ammeters including a first ammeter a1 and a second ammeter a 2. The signal switching module 120 includes: the circuit comprises a second change-over switch SA2, a third change-over switch SA3 and six resistors, wherein the six resistors comprise a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The signal conditioning module 130 includes a potentiometer R7.
Fig. 2 is a schematic diagram of a fault detection circuit of a hydraulic control valve according to an embodiment of the present invention. As shown in fig. 2, a failure detection circuit of a hydraulic control valve of the embodiment includes:
a positive pin a of the first plug XP1 is connected to the first contact 1 of the first switch SA1, the positive pin a of the second plug XP2, the positive pole of the first voltmeter V1, the fifth contact 5 of the second switch SA2 and the ninth contact 9 of the second switch SA2, a negative electrode pin B of the first plug XP1 is respectively connected with a negative electrode pin B of the second conversion switch SA2, a negative electrode of the first voltmeter V1, a negative electrode of the first ammeter A1, a third contact 3 of the second conversion switch SA2 and an eleventh contact 11 of the second conversion switch SA2, an enabling pin C of the first plug XP1 is connected with a third contact 3 of the first conversion switch SA1, a first output signal pin D of the first plug XP1 is connected with a first contact 1 of the second conversion switch SA2, a second output signal pin E of the first plug XP1 is connected with a seventh contact 7 of the second conversion switch SA2, and a grounding pin G of the first plug XP1 and a grounding pin G of the second plug XP2 are grounded;
an enable pin C of the second plug XP2 is connected to the second contact 2 of the first switch SA1 and the fourth contact 4 of the first switch SA1, a first output signal pin D of the second plug XP2 is connected to the positive electrode of the second ammeter a2, a second output signal pin E of the second plug XP2 is connected to the negative electrode of the second voltmeter a2, the tenth contact 10 of the third switch SA3, the eighth contact 8 of the second switch SA2, the tenth contact 10 of the second switch SA2 and the twelfth contact 12 of the second switch SA2, a spool feedback signal pin F of the second plug XP2 is connected to the positive electrode of the first ammeter a1, the positive electrode of the second ammeter a2 is connected to the third pin 3 of the potentiometer R7 and the second contact 2 of the second switch SA2, and the positive electrode of the second voltmeter V2 is connected to the third pin 3 of the potentiometer R7;
a first pin 1 of the potentiometer R7 is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to one end of a second resistor R2, one end of a third resistor R3, a tenth contact 10 of a second transfer switch SA2, a twelfth contact 12 of a second transfer switch SA2, and a ninth contact 9 of a third transfer switch SA3, the other end of the second resistor R2 is connected to an eleventh contact 11 of a third transfer switch SA3, the other end of the third resistor R3 is connected to a seventh contact 7 of a third transfer switch SA3, a second pin 2 of the potentiometer R7 is connected to one end of a sixth resistor R6, a second contact 2 of the third transfer switch SA 56, a fourth contact 4 of the third transfer switch SA3, and a sixth contact 6 of the third transfer switch SA3, the other end of the sixth resistor R6 is connected to one end of a fifth resistor R5, a third contact 2 of the third transfer switch SA 8252, a fourth contact 934 of the third transfer switch SA 388627, and a fourth contact 2 of the fourth transfer switch SA 3646, the other end of the fifth resistor R5 is connected to the first contact 1 of the third switch SA3, and the other end of the fourth resistor R4 is connected to the fifth contact 5 of the third switch SA 3.
In one embodiment, the type of the first change-over switch in the failure detection circuit of the hydraulic control valve of the present invention is different from the types of the second change-over switch and the third change-over switch, which are the same. The model specification of the first change-over switch is XB4BD33, and the model specifications of the second change-over switch and the third change-over switch are LW 5D-16. The first voltmeter and the second voltmeter are direct current voltmeter, the first ammeter and the second ammeter are direct current ammeters, wherein the voltage range of the first voltmeter is 0-30v, the voltage range of the second voltmeter is-15 v- +15v, and the current ranges of the first ammeter and the second ammeter are-20 mA- +20 mA. In addition, the resistance values of the first resistor and the sixth resistor are both 21k omega, the resistance values of the second resistor and the fourth resistor are both 1200 omega, the resistance values of the third resistor and the fifth resistor are both 600 omega, and the adjusting range of the potentiometer is 0-30k omega. The model specification of the first plug and the second plug is ZY-S505-G. The components in the fault detection circuit of the hydraulic control valve are low in cost and convenient to repair and replace.
Further, the failure detection circuit of the hydraulic control valve of the present invention may perform failure detection on a proportional valve, a servo valve, or the like. Taking a servo valve as an example, under the condition that a fault detection circuit of a hydraulic control valve carries out fault detection on the servo valve, a first plug is used as a signal input end and connected with a controller of a hydraulic system, an original controller power source is used, a power supply does not need to be carried, the servo valve can be directly detected and controlled to be given, and a second plug is used as a signal output end and connected with the servo valve; the middle of the signal input end and the signal output end is connected with a second voltmeter, a first ammeter and a second ammeter, and the fault point of the servo valve can be directly judged through display readings of the second voltmeter, the first ammeter and the second ammeter. The servo valve has the characteristics of comprehensive test range, convenience in use, no requirement on technical mastery degree and the like, can output and detect various common voltage and current signals, also adopts a mechanical current voltmeter to directly display a measurement result, has low failure rate and small error, and is convenient to observe and discover slight differences, thereby analyzing the failure point and the failure reason of the servo valve.
In addition, the second change-over switch, the third change-over switch and the potentiometer are used for switching the signal type output by the signal output end, and the signal type output by the signal output end is specifically switched by adjusting the value of the potentiometer. The first changeover switch is set locally and remotely by switching, and whether the failure point is a valve body failure or a controller failure is analyzed.
The fault detection circuit of the hydraulic control valve of the embodiment of the invention comprises: the device comprises three change-over switches, two plugs, two voltmeters, two ammeters, six resistors and a potentiometer; the three change-over switches comprise a first change-over switch, a second change-over switch and a third change-over switch, the two plugs comprise a first plug and a second plug, the two voltmeters comprise a first voltmeter and a second voltmeter, the two ammeters comprise a first ammeter and a second ammeter, and the six resistors comprise a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. The failure point of the hydraulic control valve can be directly judged through the ammeter and the voltmeter indicating number in the failure detection circuit of the hydraulic control valve, so that the hydraulic control valve is convenient to operate and high in efficiency.
In one embodiment, under the condition that the first switch is selected locally and the display number of the first voltmeter is normal, the resistance value of the potentiometer is adjusted to obtain the display number of the first ammeter, the display number of the second ammeter and the display number of the second voltmeter, and whether the hydraulic control valve is damaged or not is judged through the display number of the first ammeter, the display number of the second ammeter and the display number of the second voltmeter.
Further, under the condition that the second change-over switch is a current change-over switch and the display indication number of the first ammeter is different from that of the second ammeter, the hydraulic control valve is damaged; in the case where the second changeover switch is a voltage changeover switch and the display indication of the second ammeter is not in direct proportion to the display indication of the second voltmeter, the hydraulic control valve is damaged.
Specifically, the transfer switches are classified into a plurality of specifications including XB4BD33, LW5D-16, and the like, and the second transfer switch and the third transfer switch in the present invention have the same specification type, and each of the second transfer switch and the third transfer switch can select a current transfer switch or a voltage transfer switch by adjusting a shift position. When the second change-over switch is adjusted to the current gear and the display reading of the first ammeter is different from the display reading of the second ammeter, the hydraulic control valve can be judged to be damaged; in the case where the second changeover switch is adjusted to the voltage step and the display indication of the second ammeter is not in direct proportion to the display indication of the second voltmeter, it can be determined that the hydraulic control valve is damaged. It should be noted that the disproportionate relationship between the display numbers of the second ammeter and the second voltmeter means that the quotient of the display numbers of the second ammeter and the second voltmeter recorded at each of the plurality of times is not the same value in the case where the display numbers of the second ammeter and the second voltmeter are dividend, or the quotient of the display numbers of the second ammeter and the second voltmeter recorded at each of the plurality of times is not the same value in the case where the display numbers of the second ammeter and the second voltmeter are dividend.
In one embodiment, in the case that the first change-over switch is switched from local to remote control and the display reading of the first voltmeter is abnormal, the output end of the controller is in failure; in the case that the first changeover switch is selected locally and the display indication of the first voltmeter is abnormal, the power supply of the controller is failed.
Specifically, the abnormal number displayed by the voltmeter means that the voltmeter cannot normally display the number or the number displayed by the voltmeter exceeds a specified voltage range of the voltmeter, and the like, wherein in the first voltmeter, the voltage range of the first voltmeter in the present invention is 0-30v, and if the number displayed by the first voltmeter is 35v, the number displayed by the first voltmeter exceeds the specified voltage range of the first voltmeter. In addition, the first change-over switch has a plurality of gears, and the gear of the first change-over switch is selected to be locally or remotely controlled by adjusting.
Fig. 3 is a front view of an apparatus provided by an embodiment of the invention. As shown in fig. 3, the apparatus includes at least a failure detection circuit of a hydraulic control valve in any of the above embodiments.
In one embodiment, the apparatus includes at least one of the above-described failure detection circuits for hydraulic control valves, and is rectangular, and as seen from a front view of the apparatus, the apparatus is provided with a first voltmeter 31, a second voltmeter 32, a first ammeter 33, a second ammeter 34, a first changeover switch 37, a second changeover switch 35, a third changeover switch 36, and a potentiometer 38. The device can output analog quantity signals of 4-20mA, +/-10 mA and +/-10V, has a detection function corresponding to the analog quantity signals, and also has a function of detecting feedback signals of valve cores of a proportional valve and a servo valve.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (6)
1. A failure detection circuit for a hydraulic control valve, comprising:
the device comprises a fault judgment module, a signal switching module, a signal adjusting module and two plugs;
the two plugs comprise a first plug and a second plug, and the first plug is connected with the second plug;
the fault judgment module is respectively connected with the signal switching module, the signal adjusting module, the first plug and the second plug, the signal switching module is also connected with the first plug and the signal adjusting module, and the signal adjusting module is also connected with the second plug;
wherein, the fault judgment module comprises:
the device comprises a first conversion switch, two voltmeters and two current meters, wherein the two voltmeters comprise a first voltmeters and a second voltmeters, and the two current meters comprise a first current meter and a second current meter;
the signal switching module includes:
the six resistors comprise a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the signal conditioning module comprises a potentiometer;
the fault judgment module is respectively connected with the signal switching module, the signal adjusting module, the first plug and the second plug, the signal switching module is further connected with the first plug and the signal adjusting module, and the signal adjusting module is further connected with the second plug and comprises:
the positive pin of the first plug is respectively connected with the first contact of the first change-over switch, the positive pin of the second plug, the positive pole of the first voltmeter, the fifth contact of the second change-over switch and the ninth contact of the second change-over switch, a negative pin of the first plug is respectively connected with a negative pin of the second transfer switch, a negative electrode of the first voltmeter, a negative electrode of the first ammeter, a third contact of the second transfer switch and an eleventh contact of the second transfer switch, an enabling pin of the first plug is connected with the third contact of the first change-over switch, a first output signal pin of the first plug is connected with the first contact of the second change-over switch, a second output signal pin of the first plug is connected with a seventh contact of the second change-over switch, and a grounding pin of the first plug and a grounding pin of the second plug are both grounded;
an enable pin of the second plug is connected with a second contact of the first change-over switch and a fourth contact of the first change-over switch respectively, a first output signal pin of the second plug is connected with an anode of the second ammeter, a second output signal pin of the second plug is connected with a cathode of the second voltmeter, a tenth contact of the third change-over switch, an eighth contact of the second change-over switch, a tenth contact of the second change-over switch and a twelfth contact of the second change-over switch respectively, a valve core feedback signal pin of the second plug is connected with an anode of the first ammeter, an anode of the second ammeter is connected with a third pin of the potentiometer and a second contact of the second change-over switch respectively, and an anode of the second voltmeter is connected with a third pin of the potentiometer;
a first pin of the potentiometer is connected with one end of the first resistor, the other end of the first resistor is respectively connected with one end of the second resistor, one end of the third resistor, a tenth contact of the second change-over switch, a twelfth contact of the second change-over switch and a ninth contact of the third change-over switch, the other end of the second resistor is connected with an eleventh contact of the third change-over switch, the other end of the third resistor is connected with a seventh contact of the third change-over switch, a second pin of the potentiometer is respectively connected with one end of the sixth resistor, a second contact of the third change-over switch, a fourth contact of the third change-over switch and a sixth contact of the third change-over switch, and the other end of the sixth resistor is respectively connected with one end of the fifth resistor, a third contact of the third change-over switch and one end of the fourth resistor, The other end of the fifth resistor is connected with the first contact of the third change-over switch, and the other end of the fourth resistor is connected with the fifth contact of the third change-over switch.
2. The failure detection circuit of a hydraulic control valve as set forth in claim 1, characterized in that in case that the first changeover switch is selected on site and the display indication of the first voltmeter is normal, the resistance value of the potentiometer is adjusted to obtain the display indication of the first ammeter, the display indication of the second ammeter, and the display indication of the second voltmeter, and whether the hydraulic control valve is broken is determined by the display indication of the first ammeter, the display indication of the second ammeter, and the display indication of the second voltmeter.
3. The failure detection circuit of a hydraulic control valve according to claim 1, characterized in that, in a case where the second changeover switch is a current changeover switch and the display indication of the first ammeter is not the same as the display indication of the second ammeter, it is judged that the hydraulic control valve is broken;
and under the condition that the second change-over switch is a voltage change-over switch and the display indication number of the second ammeter and the display indication number of the second voltmeter are not in direct proportion, judging that the hydraulic control valve is damaged.
4. The failure detection circuit of a hydraulic control valve according to claim 1, characterized in that the first change-over switch is different in type from the second change-over switch and the third change-over switch.
5. The failure detection circuit of a hydraulic control valve according to claim 4, characterized in that the second change-over switch and the third change-over switch are of the same type.
6. A failure detection apparatus of a hydraulic control valve, characterized in that the apparatus includes at least a failure detection circuit of a hydraulic control valve according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110698064.3A CN113482986B (en) | 2021-06-23 | 2021-06-23 | Fault detection circuit and equipment of hydraulic control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110698064.3A CN113482986B (en) | 2021-06-23 | 2021-06-23 | Fault detection circuit and equipment of hydraulic control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113482986A CN113482986A (en) | 2021-10-08 |
| CN113482986B true CN113482986B (en) | 2022-08-09 |
Family
ID=77935904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110698064.3A Active CN113482986B (en) | 2021-06-23 | 2021-06-23 | Fault detection circuit and equipment of hydraulic control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113482986B (en) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3922659A (en) * | 1974-07-29 | 1975-11-25 | Baxter Laboratories Inc | Power line fault indicating system employing a neon lamp oscillator |
| JP3183957B2 (en) * | 1992-07-03 | 2001-07-09 | 九州電力株式会社 | Fault location device |
| JP3375020B2 (en) * | 1994-07-12 | 2003-02-10 | 株式会社デンソー | Drive circuit for bidirectional flow control valve |
| US6999853B2 (en) * | 2002-05-03 | 2006-02-14 | Fisher Controls International Llc. | Methods and apparatus for operating and performing diagnostics in a control loop of a control valve |
| US7620522B2 (en) * | 2004-11-19 | 2009-11-17 | Festo Ag & Co. | Diagnostic device for at least one pneumatic valve actuator arrangement |
| CN202251248U (en) * | 2011-08-25 | 2012-05-30 | 中联重科股份有限公司 | Controller and device for detecting hydraulic valve, device for detecting fault of hydraulic circuit and fault processing system |
| CN202815578U (en) * | 2012-08-24 | 2013-03-20 | 北京合锐赛尔电力科技有限公司 | Intelligent fault detection circuit for a power distribution switch control loop |
| CN202994951U (en) * | 2012-12-04 | 2013-06-12 | 武汉理工大学 | Diesel-engine fuel-cut-off solenoid valve coil break line detection apparatus |
| CN105101029B (en) * | 2014-05-16 | 2019-03-01 | 哈尔滨飞机工业集团有限责任公司 | A kind of audio frequency control experimental rig |
| CN203951163U (en) * | 2014-07-08 | 2014-11-19 | 国网山东夏津县供电公司 | Low voltage failure detector |
| CN104295561A (en) * | 2014-10-15 | 2015-01-21 | 上海徽封机电设备有限公司 | Proportional servo valve testing system and testing method thereof |
| CN104897382B (en) * | 2015-04-27 | 2017-11-03 | 北京航空航天大学 | A kind of area of computer aided fuel valve automatic checkout system |
| JP6316776B2 (en) * | 2015-06-09 | 2018-04-25 | 日立建機株式会社 | Hydraulic drive system for work machines |
| CN105571846B (en) * | 2015-12-16 | 2018-06-26 | 宁波宝新不锈钢有限公司 | A kind of portable electro-hydraulic proportional valve failure diagnostic apparatus |
| CN205592228U (en) * | 2016-04-18 | 2016-09-21 | 天津奥兰特液压设备维修有限公司 | Portable multi -functional hydraulic control valve failure diagnosis test instrument of intelligence |
| DE102016121268A1 (en) * | 2016-11-07 | 2018-05-09 | Eaton Industries (Austria) Gmbh | Test device for the functional test of protective switching devices |
| IT201800008208A1 (en) * | 2018-08-28 | 2020-02-28 | Camozzi Automation Spa | DEVICE AND METHOD OF DIAGNOSTICS FOR SOLENOID VALVES |
-
2021
- 2021-06-23 CN CN202110698064.3A patent/CN113482986B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113482986A (en) | 2021-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103364709B (en) | A kind of function test system of actual load circuit board and method | |
| CN101783183A (en) | Current-limiting circuit for testing performance indexes of resistive random access memory (RRAM) | |
| CN102721891B (en) | Test device for non-liner resistor type resonance eliminator | |
| CN102565696B (en) | Quick measuring device of protective pressing plate and measuring method thereof | |
| CN101718853A (en) | Detecting device and detecting method of single-phase double-loop metering electric energy meter | |
| CN111060761A (en) | Test simulation device, liquid rocket engine test system and test method | |
| CN204101671U (en) | A kind of Novel multi-core cable tester | |
| CN110726951B (en) | Method for detecting connection state of power supply far-end voltage compensation end | |
| CN105785169A (en) | Battery system pre-charging management testing device and testing method thereof | |
| CN113482986B (en) | Fault detection circuit and equipment of hydraulic control valve | |
| CN104991214A (en) | Digital integrated circuit direct current parameter standard reproducing method and standard apparatus | |
| CN107687905B (en) | Platinum resistance temperature acquisition device | |
| CN205404719U (en) | Mutual -inductor common return multipoint earthing detector | |
| CN206946659U (en) | A kind of adjustable acousto-optic alarming device for DCS system | |
| CN216387829U (en) | Program-controlled resistance box for vehicle-mounted instrument | |
| CN217007468U (en) | Current sampling circuit and current measuring system | |
| CN207703949U (en) | A kind of multi-purpose frequency conversion automatic system tester | |
| CN109239514B (en) | Short circuit and open circuit detection circuit of liquid level meter sensor | |
| CN107167678A (en) | A kind of multifunctional analogue signal Acquisition Circuit | |
| CN205015427U (en) | Neutral point multipoint earthing detection device based on high accuracy testing electric current | |
| CN104656048B (en) | A kind of calibration method of switch action characteristic testing stand | |
| CN203606695U (en) | Current transforming controller tester of wind generating set | |
| CN219831677U (en) | Electrical property test gas circuit control system | |
| CN112526427A (en) | Auxiliary inspection device for direct current system of transformer substation | |
| CN104914848A (en) | Electric locomotive brake logic control device test equipment and test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |