CN113233279A - Speed limiting valve test device and test method - Google Patents
Speed limiting valve test device and test method Download PDFInfo
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- CN113233279A CN113233279A CN202110411404.XA CN202110411404A CN113233279A CN 113233279 A CN113233279 A CN 113233279A CN 202110411404 A CN202110411404 A CN 202110411404A CN 113233279 A CN113233279 A CN 113233279A
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- way valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
- B66B5/048—Testing of overspeed governor
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- 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
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a speed-limiting valve testing device and a testing method.A variable pump input end is used for communicating a corresponding oil tank, and a variable pump output end, a P port of an overflow valve and a P port of a three-position four-way valve are communicated; the T port of the overflow valve is communicated with the T port of the three-position four-way valve and is used for communicating with a corresponding oil tank; one end of the flow sensor is communicated with a port B of the three-position four-way valve, and the other end of the flow sensor is communicated with a port B of the tested speed-limiting valve; the port B of the three-position four-way valve is also communicated with the port A of the second two-position two-way valve, and the port B of the second two-position two-way valve is used for communicating a corresponding oil tank; the lifting bearing platform is connected with a piston rod of a hydraulic cylinder, a detection piece is used for detecting the displacement and/or the speed of the movement of the lifting bearing platform, and an opening A of the hydraulic cylinder is used for communicating an opening A of a speed-limiting valve to be detected; and the port A of the hydraulic cylinder and/or the port B of the three-position four-way valve are/is communicated with a pressure sensor. The operation is simple, and the turn-off test of the speed limiting valve can be completed quickly.
Description
Technical Field
The invention relates to a speed limiting valve, in particular to a speed limiting valve testing device and a testing method.
Background
With the improvement of living standard, the elevator has become the common tool of riding instead of walk in our daily life, and compared with a traction type elevator, the occupation amount of the hydraulic elevator is not large, but the hydraulic elevator can be more applied in the fields of low-rise buildings and villa elevators because the hydraulic elevator can effectively utilize the space of the buildings, has heavy rated load and is safe and reliable to operate.
The speed-limiting cut-off valve (speed-limiting valve) is an important safety protection device in the hydraulic elevator and has the function of preventing the hydraulic elevator from overspeed and free falling caused by accidents such as system pipeline blasting, joint loosening and the like. Because the speed-limiting stop valve has the advantages of simple structure, rapid switching, reliable action and the like, the speed-limiting stop valve is used as a common safety speed limiter in a hydraulic elevator to replace a traditional safety gear.
Therefore, the performance test of the speed-limiting cut-off valve is an important link for ensuring the safety of the hydraulic elevator. The performance test of the speed-limiting cut-off valve comprises a shut-off test.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the speed-limiting valve test device which is simple to operate and can quickly complete the turn-off test of the speed-limiting valve.
The speed-limiting valve test device comprises a variable pump, an overflow valve, a three-position four-way valve, a first two-position two-way valve, a flow sensor, a hydraulic cylinder, a lifting bearing platform, a detection piece and a pressure sensor, wherein the overflow valve is arranged on the variable pump; the input end of the variable pump is communicated with a corresponding oil tank, and the output end of the variable pump, the P port of the overflow valve and the P port of the three-position four-way valve are communicated; the T port of the overflow valve is communicated with the T port of the three-position four-way valve and is used for communicating with a corresponding oil tank; one end of the flow sensor is communicated with the port B of the three-position four-way valve, and the other end of the flow sensor is communicated with the port B of the tested speed-limiting valve; the port B of the three-position four-way valve is also communicated with the port A of the first two-position two-way valve, and the port B of the first two-position two-way valve is used for communicating a corresponding oil tank; the lifting bearing platform is connected with a piston rod of the hydraulic cylinder, the detection piece is used for detecting the displacement and/or the speed of the movement of the lifting bearing platform, and an A port of the hydraulic cylinder is used for communicating with an A port of the measured speed-limiting valve; and the port A of the hydraulic cylinder and/or the port B of the three-position four-way valve are/is communicated with the pressure sensor.
The speed limiting valve test device provided by the embodiment of the invention at least has the following beneficial effects: the operation is simple, and the turn-off test of the speed limiting valve can be completed quickly; the pump source and the load (the lifting bearing platform and objects thereon) provide test pressure, so that the device is more practical, has high simulation, can truly simulate the actual working environment of the speed-limiting valve, and has quick response; the structure is simple, the test pressure is provided by the pump source and the load, and the energy-saving effect is better compared with the pressure provided by a complex pump source structure.
According to some embodiments of the invention, the hydraulic cylinder further comprises a first stop valve, the port A of the first stop valve is used for being communicated with the port A of the measured speed limiting valve, and the port B of the first stop valve is used for being communicated with the hydraulic cylinder.
According to some embodiments of the invention, the oil tank further comprises a second two-position two-way valve, the port a of the second two-position two-way valve is used for communicating with the port a of the speed limiting valve to be tested, and the port B of the second two-position two-way valve is used for communicating with the corresponding oil tank.
According to some embodiments of the invention, the device further comprises a fixed displacement pump, a second stop valve and a throttle valve, wherein the input end of the fixed displacement pump is communicated with a corresponding oil tank, the output end of the fixed displacement pump is communicated with a port P of the three-position four-way valve, a port A of the second stop valve is used for being communicated with a port A of the tested speed limiting valve, a port B of the second stop valve is communicated with a port A of the throttle valve, and a port B of the throttle valve is used for being communicated with a corresponding oil tank.
The method for testing the speed limiting valve according to the embodiment of the second aspect of the invention comprises the following steps:
a1, starting the variable pump, enabling a valve core of the three-position four-way valve to be on the right position, outputting hydraulic oil by the variable pump according to an initial flow value, adjusting an overflow valve to enable the working pressure of the measured speed-limiting valve to be +/-2% of the rated working pressure, and driving a bearing platform to ascend by a piston rod of a hydraulic cylinder;
a2, when the bearing platform rises to a preset position, the position of the valve core of the three-position four-way valve is switched, so that the valve core of the three-position four-way valve is in the middle position, and the bearing platform is suspended;
a3, switching the position of the three-position four-way valve core to make the three-position four-way valve core on the left position, the hydraulic cylinder loses pressure instantly, and the bearing platform begins to drop instantly;
in the steps from a1 to a3, pressure-time curves and flow-time curves are recorded.
The method for testing the speed limiting valve according to the embodiment of the third aspect of the invention comprises the following steps:
b1, closing the first stop valve, starting the variable pump, outputting hydraulic oil by the variable pump according to an initial flow value, adjusting an overflow valve at the right position of a valve core of the three-position four-way valve to enable the working pressure of the measured speed-limiting valve to be n times of the rated working pressure of the measured speed-limiting valve, wherein n is more than or equal to 5;
b2, keeping the working state for T time, wherein T is more than 1 min;
and b3, switching the position of the valve core of the three-position four-way valve to enable the valve core of the three-position four-way valve to be in the middle position, closing the variable pump, and observing whether the measured speed-limiting valve is permanently damaged or not.
The method for testing the speed limiting valve according to the embodiment of the fourth aspect of the invention comprises the following steps:
c1, closing the first stop valve, starting the variable pump, enabling the valve core of the three-position four-way valve to be on the right, enabling the valve core of the second two-position two-way valve to be on the right, and enabling the variable pump to output hydraulic oil according to the initial flow value;
c2, gradually increasing the output flow of the variable pump;
and c3, in the process of gradually increasing the flow, when the measured speed limiting valve is closed, recording the detection value Q1 of the flow sensor at the moment.
According to some embodiments of the invention, further comprising steps c4 and c 5; in the step c4, the output flow of the variable displacement pump is reduced, the speed-limiting valve to be measured is opened again, the first stop valve is opened, the valve core of the second two-position two-way valve is adjusted to be in the left position, and the lifting bearing platform gradually rises;
in step c5, the output flow rate of the variable displacement pump is gradually increased, and the ascending speed of the elevating and supporting platform is recorded when the detection value of the flow sensor reaches Q1.
The method for testing the speed limiting valve according to the fifth aspect of the embodiment of the invention comprises the following steps:
d1, opening the second stop valve, closing the first stop valve, starting the variable pump and the fixed displacement pump, enabling the valve core of the three-position four-way valve to be in the right position, enabling the variable pump to output hydraulic oil with an initial flow value, opening the first throttle valve with an initial opening value, and adjusting the overflow valve to enable the working pressure of the speed-limiting valve to be measured to be +/-2% of the rated working pressure;
d2, gradually increasing the opening of the throttle valve;
d3, recording the detection value Q2 of the flow sensor when the speed limiting valve to be detected is closed in the process of gradually increasing the flow.
According to some embodiments of the invention, further comprising steps d4 and d 5; in step d4, reducing the output flow of the variable pump, reopening the speed-limiting valve to be measured, opening the first stop valve and closing the second stop valve, and gradually ascending the lifting bearing platform;
in step d5, the output flow rate of the variable displacement pump is gradually increased, and the ascending speed of the elevating and lowering support table is recorded when the detection value of the flow rate sensor reaches Q2.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a first device for testing a speed-limiting valve according to an embodiment of the present invention, which can perform a shut-off test of the speed-limiting valve;
FIG. 2 is a second speed limiting valve test device with the structure shown in FIG. 1, which can be used for a speed limiting valve closing test and a compression strength test;
FIG. 3 is a third speed limiting valve test device including the structure shown in FIG. 1, which can be used for a speed limiting valve closing test, a compression strength test and an action small flow test;
FIG. 4 is a fourth speed limiting valve test device including the structure shown in FIG. 1, which can be used for a speed limiting valve closing test, a compression strength test and an action large flow test;
fig. 5 is a fifth speed limiting valve test device comprising the structure shown in fig. 1, and the fifth speed limiting valve test device can be used for performing speed limiting valve closing tests, compressive strength tests, action small flow tests and action large flow tests.
A fuel tank 1, a first filter 2 and a second filter 3;
the system comprises a variable pump 6, a constant delivery pump 7, an overflow valve 8, a first pressure sensor 9 and a three-position four-way valve 10;
a second pressure sensor 11, a flow sensor 12 and a measured speed-limiting valve 13; a third pressure sensor 14, a first cut valve 15;
the lifting bearing platform 16, the displacement sensor 17, the hydraulic cylinder 19 and the second two-position two-way valve 20;
a second stop valve 21, a throttle valve 22, a first two-position two-way valve 23 and a temperature sensor 24.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If any, the description to the first and second is only for the purpose of distinguishing technical features, and is not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 5, a speed-limiting valve testing device according to an embodiment of the first aspect of the present invention includes a variable pump 6, an overflow valve 8, a three-position four-way valve 10, a first two-position two-way valve 23, a flow sensor 12, a hydraulic cylinder 19, a lifting bearing platform 16, a detecting element, and a pressure sensor; the input end of the variable pump 6 is used for communicating with the corresponding oil tank 1, and the output end of the variable pump 6, the P port of the overflow valve 8 and the P port of the three-position four-way valve 10 are communicated; the T port of the overflow valve 8 is communicated with the T port of the three-position four-way valve 10 and is used for being communicated with the corresponding oil tank 1; one end of the flow sensor 12 is communicated with a port B of the three-position four-way valve 10, and the other end is communicated with a port B of the tested speed-limiting valve 13; the port B of the three-position four-way valve 10 is also communicated with the port A of the first two-position two-way valve 23, and the port B of the first two-position two-way valve 23 is used for communicating the corresponding oil tank 1; the lifting bearing platform 16 is connected with a piston rod of a hydraulic cylinder 19, a detection piece is used for detecting the displacement and/or the speed of the movement of the lifting bearing platform 16, and an A port of the hydraulic cylinder 19 is used for communicating with an A port of the speed-limiting valve 13 to be detected; the port A of the hydraulic cylinder 19 and/or the port B of the three-position four-way valve 10 are/is communicated with a pressure sensor.
The variable pump can be a bidirectional variable pump or a unidirectional variable pump.
The hydraulic cylinder 19 is communicated with the tested speed-limiting valve 13, so that when the tested speed-limiting valve 13 injects hydraulic oil into the hydraulic cylinder 19, a piston rod of the hydraulic cylinder 19 can drive the lifting bearing platform 16, and the lifting bearing platform 16 can ascend. In some designs, the hydraulic cylinder 19 has only one input port and its port a is not labeled. The port A of the hydraulic cylinder 19 is communicated with a corresponding pressure sensor and is used for detecting the oil pressure behind the measured speed-limiting valve 13, the port B of the three-position four-way valve 10 is communicated with a corresponding pressure sensor and is used for detecting the oil pressure in front of the measured speed-limiting valve 13, and corresponding modification is carried out based on technical knowledge in the field, so that the protection purpose of the invention is achieved.
The detecting member is used to detect the displacement and/or speed of the movement of the lifting/lowering support table 16, and may be a speed sensor or a displacement sensor as described below. A pressure sensor including a second pressure sensor and/or a third pressure sensor described below is connected to the port a of the hydraulic cylinder 19 and/or the port B of the three-position four-way valve 10.
The system also comprises a central control platform, such as a common touch system used on a computer, a smart phone and a machine tool. The oil pump is electrically connected with the central control platform, and the start and stop of the oil pump can be controlled through the central control platform; the variable oil pump is connected with the central control platform through a corresponding controller, so that the central control platform gives a preset voltage/current to the variable oil pump through the controller, and the central control platform controls the flow output by the variable oil pump; each sensor is electrically connected with the central control platform, and the central control platform is used for receiving a detection value fed back by the sensor; the electromagnets of the reversing valves are electrically connected with a central control platform, and the central control platform is used for controlling the positions of valve cores of the reversing valves and switching oil paths; the throttle valve 22 is electrically controlled, and the electrically controlled throttle valve 22 is electrically connected to a central control platform, and the opening degree of the throttle valve 22 is input into the central control platform, and the throttle valve 22 is opened according to the predetermined opening degree.
The tank 1 to which the input of the variable displacement pump 6 is connected is used to provide a source of hydraulic oil, and the tank 1 may not be available in the market, which still falls within the protection aim of the present invention. The oil tank 1 communicated with the port of the overflow valve 8T is used for collecting hydraulic oil; in actual use, the oil tank 1 for collection can be omitted, and the overflow valve 8T port can discharge hydraulic oil outwards, and the situation still belongs to the protection aim of the invention; there may be no collection tank 1 in the sales market and this situation remains within the protective spirit of the present invention. The hydraulic oil discharged outwards is very easy to cause environmental pollution; generally, the two oil tanks 1 are the same oil tank 1 or belong to the same oil tank system and are communicated, hydraulic oil circularly flows in the test device in a reciprocating mode, and the hydraulic oil is recycled through filtering and cooling.
The lifting bearing platform 16 is pressed on a piston rod of the hydraulic cylinder 19 through self gravity, and the lifting bearing platform 16 can be used for simulating a hydraulic elevator car. The speed sensor is used for detecting the moving speed of the lifting bearing platform 16, and the changes made by the skilled person without departing from the spirit of the invention belong to equivalent alternatives, for example, the displacement sensor 17 used for detecting the movement of the lifting bearing platform 16 can obtain a near transient speed by calculating the displacement in a tiny time period. The displacement sensor 17 can be a grating ruler, one of two parts of the grating ruler is fixed, and the other part is arranged on the lifting bearing platform 16; the speed sensor can be a common encoder, the encoder is installed on the lifting bearing platform 16, an output shaft of the encoder is connected with a roller in a penetrating mode, when the lifting bearing platform 16 moves up and down, the roller rotates (the roller is abutted against fixed surfaces such as a wall surface and a support surface), and the roller drives an output shaft of the encoder to rotate.
Referring to fig. 1, a method for using a speed limiting valve test device, namely a speed limiting valve test method. In this case, a shut-down test method can be specified, which comprises the following steps:
a1, starting the variable pump 6, enabling a valve core of the three-position four-way valve 10 to be at the right position (refer to fig. 1), enabling the variable pump 6 to output hydraulic oil with an initial flow value, for example, enabling 4/5 flow of ideal flow to start outputting the hydraulic oil, adjusting the overflow valve 8 to enable the working pressure of the tested speed-limiting valve 13 to be within +/-2% of the rated working pressure, ideally being the rated working pressure, and enabling a piston rod of the hydraulic cylinder 19 to drive the bearing platform to ascend;
a2, when the bearing platform rises to a preset position, the valve core position of the three-position four-way valve 10 is switched, so that the valve core of the three-position four-way valve 10 is in a middle position, and the bearing platform is suspended;
a3, switching the valve core position of the three-position four-way valve 10 to make the valve core of the three-position four-way valve 10 on the left, the hydraulic cylinder 19 loses pressure instantly, the bearing platform begins to drop instantly, the flow passing through the tested speed-limiting valve 13 also increases rapidly, when the flow reaches the action flow for closing the tested speed-limiting valve 13, the pressure difference of two ports of the tested speed-limiting valve 13 is enough to overcome the internal spring force, the tested speed-limiting valve 13 is closed, namely the oil path is closed, and the falling of the bearing platform is prevented;
in the steps from a1 to a3, pressure-time curves and flow-time curves are recorded.
The speed limiting valve test device provided by the embodiment of the invention at least has the following beneficial effects: the operation is simple, and the turn-off test of the speed limiting valve can be completed quickly; the pump source and the load (the lifting bearing platform and objects thereon) provide test pressure, so that the device is more practical, has high simulation, can truly simulate the actual working environment of the speed-limiting valve, and has quick response; the structure is simple, the test pressure is provided by the pump source and the load, and the energy-saving effect is better compared with the pressure provided by a complex pump source structure.
In some embodiments of the present invention, the first two-position two-way valve 23 is communicated with the port B of the three-position four-way valve 10 through a large-diameter oil pipe, that is, when the first two-position two-way valve 23 is opened, the port B of the speed-limiting valve 13 to be tested is communicated with the corresponding oil tank 1 through the large-diameter oil pipe. The first two-position two-way valve 23 is communicated with the port B of the three-position four-way valve 10 through a large-drift-diameter oil pipe, that is, the drift diameter of the oil pipe used by the test device is mainly D, and the inner diameter of the large-drift-diameter oil pipe is larger than 3D. Therefore, when the first two-position two-way valve 23 is conducted, the flow in front of the tested speed-limiting valve 13 is instantly reduced, and the pipeline of the simulated speed-limiting valve fails; at this time, if the speed limit valve 13 to be measured is closed rapidly, the lifting load-bearing platform 16 detected by the displacement sensor 17 descends less, or ideally, becomes zero.
In some embodiments of the invention, the variable displacement pump includes a pump body and a variable frequency variable speed motor drivingly connected to the pump body. A variable frequency speed regulating motor is introduced to drive a variable pump to form a direct-drive volume control oil source, and compared with the traditional scheme, the scheme has the energy-saving effect. The basic principle is as follows: when the system needs small-flow oil, the oil flow can be controlled by adjusting the rotating speed of the motor and/or the small displacement, and the three modes save energy; when the system needs large-flow oil, the displacement of the pump (the structure of self-carrying displacement adjustment in the variable displacement pump) can be preferentially adjusted under the condition that the rotating speed of the motor is unchanged, so that the control of the flow is realized under the condition of saving the output power of the motor, and the energy-saving effect is achieved. Therefore, the control is simple, the operation is not complex, and the test method is easy to realize.
In some embodiments of the present invention, an acceleration sensor is included for detecting acceleration of the movement of the lift weight table 16.
In some embodiments of the present invention, the piston rod of the hydraulic cylinder 19 is threadedly connected to the lifting load-bearing platform 16, i.e., the piston rod of the hydraulic cylinder 19 is detachably connected to the lifting load-bearing platform 16, and the lifting load-bearing platform 16 has a plurality of weight specifications.
In some embodiments of the invention, the port A of the three-position four-way valve 10 is communicated with the corresponding oil tank 1; in part of tests, the port A and the port P of the three-position four-way valve 10 are communicated with the same oil tank 1, and the port P is communicated with the oil tank 1 through an oil pump. In some embodiments of the present invention, port A of the three-position, four-way valve 10 is plugged.
In some embodiments of the invention, the device further comprises a mounting platform, and the mounting platform is used for mounting the tested speed limiting valve 13. During testing, the tested speed-limiting valve 13 is fixed on the mounting platform, and then the port A and the port B of the tested speed-limiting valve 13 are communicated to the corresponding interfaces through oil pipes. Therefore, the measured speed-limiting valve 13 is prevented from being suspended by the oil pipe, oil leakage and pressure relief at the joint between the oil pipe and the measured speed-limiting valve 13 are avoided, and the accuracy of test data is effectively improved.
In practice, the partial overflow valve 8 is provided with a pressure gauge/sensor.
Referring to FIG. 5, in some embodiments of the present invention, port P of the three-position, four-way valve 10 is connected to a first pressure sensor 9/gauge, port B of the three-position, four-way valve 10 is connected to a second pressure sensor 11, and port A of the hydraulic cylinder 19 is connected to a third pressure sensor 14. And when the overflow valve is operated to adjust the oil pressure at the output end of the variable pump, observing the oil pressure fed back by the first pressure sensor.
In some embodiments of the present invention, the third pressure sensor 14 is also connected to port P of the three-position, four-way valve 10, and the pressure-time curve of the third pressure sensor 14 is recorded during the steps from a2 to a 5.
The structure shown in the figure 1 can be upgraded to the structure shown in the figure 2, and the structure shown in the figure 2 can be used for a speed limiting valve closing test and a compression strength test. Referring to fig. 2, in some embodiments of the present invention, a first shut-off valve 15 is further included, a port a of the first shut-off valve 15 is used for communicating with a port a of the speed-limiting valve 13 to be measured, and a port B of the first shut-off valve 15 is used for communicating with a hydraulic cylinder 19. The pressure sensor behind the measured speed-limiting valve 13 is communicated with the port A of the first stop valve 15, the pressure sensor is not directly communicated with the port A of the hydraulic cylinder 19, and the pressure sensor is also used for detecting the oil pressure behind the measured speed-limiting valve 13.
Referring to fig. 2, a method for using a speed limiting valve test device, namely a speed limiting valve test method. This may be embodied as a method of compressive strength testing, comprising the steps of:
b1, closing the first stop valve 15, starting the variable pump 6, outputting hydraulic oil by the variable pump 6 with an initial flow value, for example, starting to output hydraulic oil with 4/5 flow of ideal flow, adjusting the overflow valve 8 by the valve core of the three-position four-way valve 10 at the right position (refer to fig. 2), so that the working pressure of the speed-limiting valve 13 to be measured is n times of the rated working pressure, wherein n is more than or equal to 5, such as five times, six times and eight times;
b2, keeping the working state for T time, wherein T is more than 1min, such as 2 min;
b3, switching the valve core position of the three-position four-way valve 10, enabling the valve core of the three-position four-way valve 10 to be in the middle position, closing the variable pump 6, and observing whether the speed-limiting valve 13 to be measured is permanently damaged or not.
The structures shown in the figures 1 and 2 can be upgraded and evolved to the structures shown in the figure 3, and the structures shown in the figure 3 can be used for performing a speed limiting valve closing test, a compressive strength test and an action small flow test. Referring to fig. 3, in some embodiments of the present invention, a second two-position two-way valve 20 is further included, and the port a of the second two-position two-way valve 20 is used for communicating with the port a of the speed-limiting valve 13 to be measured, that is, it can be understood that the port a of the second two-position two-way valve 20, the port a of the speed-limiting valve 13 to be measured, and the port a of the first stop valve 15 are communicated; the port B of the second two-position and two-way valve 20 is used for communicating with the corresponding oil tank 1.
Referring to fig. 3, a method for using a speed limiting valve test device, namely a speed limiting valve test method. This may be embodied as a method of action low flow assay, the method comprising the steps of:
c1, closing the first stop valve 15, starting the variable pump 6, with the valve core of the three-position four-way valve 10 at the right position (refer to fig. 3), the valve core of the second two-position two-way valve 20 at the right position (refer to fig. 3), and the variable pump 6 outputting hydraulic oil with an initial flow value, such as 1/5 of ideal flow;
c2, gradually increasing the output flow of the variable pump 6, namely gradually increasing the flow passing through the valve;
c3, in the process of gradually increasing the flow rate, when the speed-limiting valve 13 to be measured is closed, recording that the flow rate value at the moment of the detection value Q1 of the flow rate sensor 12 is the closed flow rate of the speed-limiting valve 13 to be measured, for example, when the flow rate is increased to 1/4 of the ideal flow rate, the speed-limiting valve 13 to be measured is closed.
Referring to fig. 3, in some embodiments of the present invention, steps c4 and c5 are further included; in step c4, the output flow of the variable displacement pump 6 is reduced, the speed-limiting valve 13 to be measured is opened again, the first stop valve 15 is opened, the spool of the second two-position two-way valve 20 is adjusted to be in the left position (refer to fig. 3), and the lifting bearing platform 16 is driven by the hydraulic cylinder 19 to gradually rise;
in step c5, the output flow rate of the variable displacement pump 6 is gradually increased, and the rising speed of the lifting/lowering support base 16 at this time is recorded when the value detected by the flow sensor 12 reaches Q1.
The structures shown in the figures 1 and 2 can be upgraded and evolved to the structure shown in the figure 4, and the structure shown in the figure 4 can be used for performing a speed limiting valve closing test, a compressive strength test and an action large flow test. Referring to fig. 4, in some embodiments of the present invention, the present invention further includes a fixed displacement pump 7, a second stop valve 21 and a throttle valve 22, wherein an input end of the fixed displacement pump 7 is communicated with the corresponding oil tank 1; the output end of the fixed displacement pump 7 is communicated with the port P of the three-position four-way valve 10, that is, the output end of the variable displacement pump 6, the output end of the fixed displacement pump 7 and the port P of the three-position four-way valve 10 are communicated; the port A of the second stop valve 21 is used for communicating with the port A of the measured speed-limiting valve 13, that is, the port A of the second stop valve 21, the port A of the first stop valve 15 and the port A of the measured speed-limiting valve 13 are communicated; the port B of the second cut-off valve 21 communicates with the port a of the throttle valve 22, and the port B of the throttle valve 22 communicates with the corresponding tank 1.
The corresponding position exchange modification of the second cut-off valve 21 and the first throttle valve 22 is an equivalent alternative. The direct-drive pump source is mainly formed by a variable pump 6 and an overflow valve 8, the valve-controlled pump source is mainly formed by a fixed displacement pump 7, the overflow valve 8 and a three-position four-way valve 10, and the two pump sources are combined. In the small flow test, the second cut-off valve 21 is closed.
Referring to fig. 4, a method for using a speed limiting valve test device, namely a speed limiting valve test method. In this case, a method for testing a high flow rate of action can be embodied, which comprises the following steps:
d1, opening the second stop valve 21, closing the first stop valve 15, starting the variable pump 6 and the fixed displacement pump 7, the valve core of the three-position four-way valve 10 is at the right position (refer to fig. 4), the variable pump 6 outputs the hydraulic oil with the initial flow value, for example, the hydraulic oil starts to be output with the 4/5 flow of the ideal flow, the first throttle valve 22 is opened with the initial opening value, for example, the first throttle valve is opened with the 1/5 of the full opening, the overflow valve 8 is adjusted, the working pressure of the speed-limiting valve 13 to be measured is the rated working pressure +/-2%, and the ideal is the rated working pressure;
d2, gradually increasing the opening of the throttle valve 22, namely gradually increasing the valve passing flow;
d3, recording that the flow value Q2 detected by the flow sensor 12 at the moment is the closing flow of the speed-limiting valve 13 when the speed-limiting valve 13 to be detected is closed in the process of gradually increasing the flow, for example, when the flow is increased to 5/6 of the ideal flow, the speed-limiting valve 13 to be detected is closed.
Referring to fig. 4, in some embodiments of the present invention, steps d4 and d5 are also included; in step d4, the output flow of the variable displacement pump 6 is reduced, the speed-limiting valve 13 to be measured is opened again, the first stop valve 15 is opened, the second stop valve 21 (see fig. 4) is closed, and the lifting bearing platform 16 is driven by the hydraulic cylinder 19 to gradually rise;
in step d5, the output flow rate of the variable displacement pump 6 is gradually increased, and the rising speed of the lifting/lowering support base 16 at this time is recorded when the value detected by the flow rate sensor 12 reaches Q2.
In some embodiments of the invention, the bidirectional fixed displacement pump 7 communicates with the corresponding tank 1 through the first filter 2. In some embodiments of the invention, the dosing pump 7 communicates with the corresponding tank 1 through the second filter 3. The filter generally comprises a shell and a filter element arranged in the shell, wherein the filter element is sheet-shaped or cylindrical, and the filter element is generally made of materials such as cotton plastic and cotton rubber.
In some embodiments of the present invention, a temperature sensor 24 is further included, and one temperature sensor 24 is used for detecting the temperature of the oil in the corresponding oil tank 1.
In some embodiments of the present invention, the liquid level meter is further included, and one liquid level meter is communicated with the corresponding oil tank 1.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A speed-limiting valve test device is characterized by comprising a variable pump (6), an overflow valve (8), a three-position four-way valve (10), a first two-position two-way valve (23), a flow sensor (12), a hydraulic cylinder (19), a lifting bearing platform (16), a detection piece and a pressure sensor;
the input end of the variable pump (6) is communicated with the corresponding oil tank (1), and the output end of the variable pump (6), the P port of the overflow valve (8) and the P port of the three-position four-way valve (10) are communicated; the T port of the overflow valve (8) is communicated with the T port of the three-position four-way valve (10) and is used for communicating with the corresponding oil tank (1);
one end of the flow sensor (12) is communicated with a port B of the three-position four-way valve (10), and the other end of the flow sensor is communicated with a port B of the tested speed-limiting valve (13); the port B of the three-position four-way valve (10) is also communicated with the port A of the first two-position two-way valve (23), and the port B of the first two-position two-way valve (23) is used for communicating the corresponding oil tank (1);
the lifting bearing platform (16) is connected with a piston rod of the hydraulic cylinder (19), the detection part is used for detecting the displacement and/or the speed of the movement of the lifting bearing platform (16), and an A port of the hydraulic cylinder (19) is used for communicating with an A port of the speed limiting valve (13) to be detected;
and the port A of the hydraulic cylinder (19) and/or the port B of the three-position four-way valve (10) are/is communicated with the pressure sensor.
2. The speed limit valve test device according to claim 1, further comprising a first stop valve (15), wherein the port A of the first stop valve (15) is used for being communicated with the port A of the tested speed limit valve (13), and the port B of the first stop valve (15) is used for being communicated with the hydraulic cylinder (19).
3. The speed-limiting valve test device according to claim 2, characterized by further comprising a second two-position two-way valve (20), wherein the port A of the second two-position two-way valve (20) is used for being communicated with the port A of the tested speed-limiting valve (13), and the port B of the second two-position two-way valve (20) is used for being communicated with the corresponding oil tank (1).
4. The speed-limiting valve test device according to claim 2, further comprising a fixed displacement pump (7), a second stop valve (21) and a throttle valve (22), wherein an input end of the fixed displacement pump (7) is communicated with the corresponding oil tank (1), an output end of the fixed displacement pump (7) is communicated with a port P of the three-position four-way valve (10), a port A of the second stop valve (21) is used for being communicated with a port A of the tested speed-limiting valve (13), a port B of the second stop valve (21) is communicated with a port A of the throttle valve (22), and a port B of the throttle valve (22) is used for being communicated with the corresponding oil tank (1).
5. A test method of a speed limiting valve is characterized by comprising the following steps:
a1, starting the variable pump (6), enabling a valve core of the three-position four-way valve (10) to be at the right position, outputting hydraulic oil by the variable pump (6) according to an initial flow value, adjusting an overflow valve (8) to enable the working pressure of the measured speed-limiting valve (13) to be within +/-2% of the rated working pressure, and driving a bearing platform to ascend by a piston rod of a hydraulic cylinder (19);
a2, when the bearing platform rises to a preset position, the valve core position of the three-position four-way valve (10) is switched, so that the valve core of the three-position four-way valve (10) is in the middle position, and the bearing platform is suspended;
a3, switching the valve core position of the three-position four-way valve (10) to make the valve core of the three-position four-way valve (10) in the left position, and the hydraulic cylinder (19) loses pressure instantly and the bearing platform begins to drop instantly;
in the steps from a1 to a3, pressure-time curves and flow-time curves are recorded.
6. A test method of a speed limiting valve is characterized by comprising the following steps:
b1, closing the first stop valve (15), starting the variable pump (6), outputting hydraulic oil by the variable pump (6) according to an initial flow value, adjusting the overflow valve (8) at the right position of the valve core of the three-position four-way valve (10) to enable the working pressure of the measured speed-limiting valve (13) to be n times of the rated working pressure of the measured speed-limiting valve, wherein n is more than or equal to 5;
b2, keeping the working state for T time, wherein T is more than 1 min;
b3, switching the valve core position of the three-position four-way valve (10), enabling the valve core of the three-position four-way valve (10) to be in the middle position, closing the variable pump (6), and observing whether the speed-limiting valve (13) to be measured is permanently damaged or not.
7. A test method of a speed limiting valve is characterized by comprising the following steps:
c1, closing the first stop valve (15), starting the variable pump (6), enabling the valve core of the three-position four-way valve (10) to be at the right position, enabling the valve core of the second two-position two-way valve (20) to be at the right position, and enabling the variable pump (6) to output hydraulic oil at an initial flow value;
c2, gradually increasing the output flow of the variable pump (6);
c3, recording the detection value Q1 of the flow sensor (12) when the speed limiting valve (13) to be detected is closed in the process of gradually increasing the flow.
8. The rate limit valve test method of claim 7, further comprising steps c4 and c 5; in the step c4, the output flow of the variable pump (6) is reduced, the speed-limiting valve (13) to be measured is opened again, the first stop valve (15) is opened, the valve core of the second two-position two-way valve (20) is adjusted to be in the left position, and the lifting bearing platform (16) gradually rises;
in step c5, the output flow rate of the variable displacement pump (6) is gradually increased, and the rising speed of the lifting bearing table (16) at this time is recorded when the detection value of the flow rate sensor (12) reaches Q1.
9. A test method of a speed limiting valve is characterized by comprising the following steps:
d1, opening the second stop valve (21), closing the first stop valve (15), starting the variable pump (6) and the fixed displacement pump (7), enabling the valve core of the three-position four-way valve (10) to be on the right, outputting hydraulic oil by the variable pump (6) at an initial flow value, opening the first throttle valve (22) at an initial opening value, and adjusting the overflow valve (8) to enable the working pressure of the speed-limiting valve (13) to be measured to be +/-2% of the rated working pressure;
d2, gradually increasing the opening of the throttle valve (22);
d3, when the speed limiting valve (13) to be measured is closed in the process of gradually increasing the flow, recording the detection value Q2 of the flow sensor (12) at the moment.
10. The rate limit valve test method of claim 9, further comprising steps d4 and d 5; in the step d4, the output flow of the variable pump (6) is reduced, the speed-limiting valve (13) to be measured is opened again, the first stop valve (15) is opened, the second stop valve (21) is closed, and the lifting bearing platform (16) gradually rises;
in step d5, the output flow rate of the variable displacement pump (6) is gradually increased, and the rising speed of the lifting bearing table (16) at this time is recorded when the detection value of the flow rate sensor (12) reaches Q2.
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Cited By (1)
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| CN115140634A (en) * | 2022-06-24 | 2022-10-04 | 天津市迅尔自控设备制造有限公司 | Cylinder self-locking device, lifter and control method |
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Application publication date: 20210810 |