Device symmetrically arranged in series and used for detecting position of large-stroke piston

Abstract

The utility model relates to a device symmetrically arranged in series and used for detecting the position of a large-stroke piston, which is characterized in that two groups of detection devices are symmetrically arranged in different three-dimensional spaces in series, the two detection devices are positioned on the same horizontal line or vertical line and are connected end to end, and transmitting signals of the two detection devices at the joint are 4mA. The signal transmission quantity of one group of detection devices is gradually reduced from 20mA to below 4mA, the signal transmission quantity of the other group of detection devices is gradually increased from 4mA to 20mA, and when one detection device is in the stroke detection area, the change rule of the signal transmission range is 4-20mA, and when the other detection device is in the stroke detection area, the change rule of the signal transmission quantity is 20-4mA. The structure is compact, the design is reasonable, and the position signal of the large-stroke piston can be accurately monitored in real time; the energy accumulator is simple in structure, free of area crossing conditions, easy to maintain, disassemble and replace, greatly improved in performance stability and reliability, reduced in failure rate and capable of providing powerful guarantee for stable operation of the whole system.

Description

TECHNICAL FIELD

[0001] The utility model relates to a piston position detection device in the field of hydraulic machinery, in particular to a device of series connection symmetrical placement and solving large stroke piston position detection. BACKGROUND

[0002] The piston accumulator is mainly used for providing energy reserve and sealing control in the hydraulic system. The piston is the key component of the accumulator, and the accuracy of its position is related to the performance and stability of the accumulator.

[0003] At present, the piston position of the large stroke piston accumulator with a stroke of several meters is detected by modern sensing technology, that is, a group of sensing detection devices are used to monitor the piston displacement information in real time, and the position signal is transmitted to the computer for analysis, and the current position of the piston is displayed in real time, and the measurement accuracy is high.

[0004] When the large stroke piston accumulator is installed, it will span two or more adjacent sealed spaces, and the corresponding group of sensing detection devices will also span multiple three-dimensional spaces. Figure 1 As shown in the figure, it comprises a piston 1, an oil press 2, a magnetic float 3, a first space 4, a second space 5 and a single set of position detection device 10. When the single set of position detection device needs to be maintained, or needs to be repaired and replaced due to failure, it is very inconvenient to disassemble and replace because its installation area spans multiple spaces, which is not conducive to the maintenance and maintenance of the accumulator, and reduces the performance stability and reliability of the accumulator. In addition, compared with the small stroke piston position detection, when a group of sensing detection devices detect the large stroke piston position, the stroke corresponding to the unit effective transmission signal of the sensing assembly is large, and the control accuracy is low.

[0005] In view of the defects of the existing technology, the designer has continuously researched and designed, and finally created the utility model with practical value after repeated trial and improvement. SUMMARY

[0006] The utility model discloses a device of series connection symmetrical placement and solving large stroke piston position detection with a novel structure, which overcomes the defects of the existing technology.

[0007] Another purpose of the utility model is to provide a device of series connection symmetrical placement and solving large stroke piston position detection, which improves the performance stability and reliability of the accumulator, and is more suitable for practical use.

[0008] The utility model discloses a still further purpose lies in, provide a kind of series symmetry placement, solve the device of large-stroke piston position detection, the technical problem to be solved is to make its sensing detection device when detecting large-stroke piston position, control precision is high, to be more suitable for practical.

[0009] The application concept of the utility model is: according to the characteristics that the energy accumulator is installed across two adjacent three-dimensional spaces, the piston position sensing detection device is increased from one group to two groups, and each group of sensing detection devices is independently arranged in a three-dimensional space, so that the sensing detection devices can be conveniently disassembled and replaced, and the maintenance level of the equipment is improved.

[0010] To comprehensively cover the large-stroke piston position detection range, the two groups of sensing detection devices are arranged in series, the effective signal 4-20mA current signal transmitted by each group of sensing detection devices is superimposed, and the real-time position of the large-stroke piston can be comprehensively detected. In addition, to improve the detection precision of the series placement structure of the two groups of detection devices and avoid the problem that the real-time position of the piston cannot be determined due to the overflow of the transmitted signal at the junction of the adjacent detection devices, the two detection devices are arranged symmetrically to each other in the utility model, that is, if the first detection device is normally placed at the standard position, the second detection device is placed at a position 180° away from the standard position; in this way, if the first detection device is in the stroke detection area, the signal transmission range changes regularly as 4-20mA, and if the second detection device is in the stroke detection area, the signal transmission range changes regularly as 20-4mA. At the junction point of the measurement position, the signal transmission amount of one group of detection devices gradually decreases from 20mA to less than 4mA, and the signal transmission amount of the other group of detection devices gradually increases from 4mA to 20mA; in this way, the electronic measurement device can accurately determine the stroke measurement range, and the real-time and accurate measurement of the piston stroke can be realized.

[0011] The utility model discloses a purpose and solve its technical problems are realized by adopting the following technical scheme. According to the utility model proposes a kind of device of large-stroke piston position detection of symmetrical placement in series, including first detection device and second detection device, first detection device is installed in the first space layer of large-stroke piston accumulator installation space span, second detection device is installed in the second space layer of large-stroke piston accumulator installation space span, first detection device and second detection device are mutually series symmetrical arrangement, i.e. first detection device is placed in normal standard position, then second detection device is placed with 180 ° direction standard position, two detection devices are on the same horizontal line or perpendicular line, and two detection devices are connected head to tail, and the transmitting signal of two detection devices at the connecting place is all 4mA, wherein, the signal transmitting amount of a group of detection devices gradually reduces from 20mA to 4mA below, and the signal transmitting amount of another group of measurement gradually increases from 4mA to 20mA, in the stroke detection area of one detection device, signal transmitting range change rule is 4-20mA, then another detection device is in the stroke detection area, and signal transmitting amount change rule is 20-4mA.

[0012] Further, it further includes mounting column, fixed clamp, electrical junction box, cable joint and electrical junction box mounting connector, wherein the fixed clamp is provided with first fixed clamp fastening end and second fixed clamp fastening end, and the first detection device and the second detection device are fixed on the mounting column through the first fixed clamp fastening end and the second fixed clamp fastening end respectively;The lower end of the first detection device overlaps the upper end of the second detection device by an installation overlap area, and the installation overlap area is 50mm-100mm, and the electrical junction box is connected and fixed through the mounting connector.

[0013] Further, wherein the electrical junction box is the electrical junction of the first detection device and the second detection device, wherein the electrical junction box is provided with first isolation module, second isolation module and terminal;The electrical wiring of the first detection device is connected with the corresponding first isolation module in the electrical junction box through cable, and the electrical wiring of the second detection device is connected with the isolation module in the electrical junction box through cable;After the detection signals of the first detection device and the second detection device are isolated and converted by the first isolation module and the second isolation module respectively, the first isolation module and the second isolation module are connected with the terminal through cable in series, the terminal is connected with the control unit through cable, the processing and display of stroke measurement signal are realized, and the cable joint is the electrical connection of two detection devices and other equipment.

[0014] By the above technical scheme, the utility model at least has the following advantages:

[0015] The utility model discloses compact structure, reasonable in design can real -time accurate monitoring big stroke piston's position signal, and the first detection device and the second detection device of symmetrical placement in series are respectively installed in different three -dimensional space, and there is no area span condition, easy to maintain, dismount and replace, greatly improve the performance stability and reliability of energy accumulator, reduce its failure rate, provide strong guarantee for the stable operation of system whole.

[0016] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a group of big stroke piston position detection device figure of prior art of the utility model.

[0018] Figure 2 It is the schematic diagram of the utility model and energy accumulator cooperation whole installation.

[0019] Figure 3 It is the schematic diagram of two groups of detection devices of the first embodiment of the utility model regular forward series arrangement.

[0020] Figure 4 It is the schematic diagram of two groups of detection devices of the second embodiment of the utility model series symmetrical arrangement.

[0021] Figure 5 It is the installation and arrangement perspective view of two groups of detection devices of the utility model of symmetrical placement in series.

[0022] Figure 6 It is the wiring principle diagram of two groups of detection devices of the utility model of symmetrical placement in series.

[0023] Figure 7 It is the working state diagram of big stroke piston position detection device of the utility model of symmetrical placement in series when filling oil.

[0024] Figure 8 It is the working state diagram of big stroke piston position detection device of the utility model of symmetrical placement in series when discharging oil.

[0025] Among them:

[0026] 1: piston 2: hydraulic oil

[0027] 3: magnetic float 4: first space

[0028] 5: second space 6: first detection device

[0029] 7: second detection device 8: zero liquid level

[0030] 9: highest liquid level 10: single set position detection device

[0031] 11: measurement position intersection point 12: fixing clamp

[0032] 13: mounting column 14: mounting overlap area

[0033] 15: electrical junction box 16: cable joint

[0034] 17: electrical junction box mounting connector 18: first fixing clamp fastening end 1

[0035] 19: second fixing clamp fastening end 20: control unit DETAILED DESCRIPTION

[0036] In order to further illustrate the technical means and effects taken by the utility model to achieve the predetermined invention purposes and effects, the following will combine the drawings and preferred embodiments to specifically describe the device for solving large-stroke piston position detection by being placed in series and symmetry, its specific implementation, structure, features and effects according to the utility model, as follows.

[0037] Please refer to Figure 2 the device for solving large-stroke piston position detection by being placed in series and symmetry, the device for solving large-stroke piston position detection, the overall structure diagram is shown in Figure 2 .

[0038] According to the characteristics of the accumulator across the adjacent two layers of stereoscopic space installation, the detection device is increased from one set to two sets, and each set of sensing detection device is independently arranged in one stereoscopic space, which can be conveniently disassembled and replaced, and the maintenance level of the equipment is improved.

[0039] According to the characteristics of the accumulator actually installed in the stereoscopic space, the first detection device 6 and the second detection device 7 are arranged in the first space layer 4 and the second space layer 5 respectively. When any detection device needs to be maintained or needs to be repaired and replaced due to failure, it does not need to cross the space, and it can be conveniently repaired, disassembled and replaced in the same stereoscopic space, which greatly reduces the failure rate of the accumulator and improves the maintenance operation level.

[0040] In order to comprehensively cover the large-stroke piston position detection range, the utility model discloses two groups of sensing detection devices are arranged in series, wherein the first detection device 6 is arranged in the first space layer 4 crossed by the large-stroke piston accumulator installation space, and the second detection device 7 is arranged in the second space layer 5 crossed by the large-stroke piston accumulator installation space, in order to improve the detection precision of the two groups of detection devices arranged in series, and avoid the problem that the adjacent detection device junction cannot judge the real-time position of the piston due to the overflow of the transmission signal, the first detection device 6 and the second detection device 7 are arranged in series and symmetrically, that is, the first detection device 6 is placed at the normal standard position, and then the second detection device 7 is placed at the standard position in the direction of 180°, the two detection devices are on the same horizontal line or vertical line, and the two detection devices are connected end to end, and the transmission signal of the two detection devices at the connection is 4mA, by superimposing the effective signal (that is, 4-20mA current signal) transmitted by each group of sensing detection devices, the real-time position of the large-stroke piston can be comprehensively detected. In this way, if the first detection device 6 is in the stroke detection area, the signal transmission range change rule is 4-20mA, and then the second detection device 7 is in the stroke detection area, and the signal transmission range change rule is 20-4mA. At the measurement position junction point, the signal transmission amount of one group of detection devices gradually decreases from 20mA to less than 4mA, and the measurement signal transmission amount of the other group of detection devices gradually increases from 4mA to 20mA; in this way, the electronic measuring device can accurately judge the stroke measurement range, and realize real-time and accurate measurement of the piston stroke.

[0041] As Figure 3 shown, in order to comprehensively obtain the real-time position of the large-stroke piston, the utility model discloses two groups of piston position detection devices arranged in series, by superimposing the effective current signal (4-20mA) transmitted by each group of sensing detection devices, the full stroke of the large-stroke piston accumulator is measured. When two groups of detection devices are arranged in series in the normal forward direction (see Figure 3 ), the transmission signal change range of each group of detection devices during the piston movement is 4-20mA. When the piston moves in the detection area of the first detection device 6, the transmitter signal gradually increases from 4mA to 20mA; when the piston moves from the junction of the first detection device 6 and the second detection device 7 to the detection area of the second detection device 7, the transmitter signal of the first detection device 6 gradually decreases from the maximum 20mA to 4mA, and when it is less than 4mA, it is determined as an invalid detection signal, and the information processing unit cannot determine whether the piston position contains the full measurement range of the first detection device 6 at this time, which is easy to cause errors in the piston position detection and low detection precision.

[0042] As Figure 4 shown, in order to solve the low detection precision problem of the conventional forward series connection, the utility model optimizes the series arrangement of the detection device, and the first detection device 6 and the second detection device 7 are arranged in series and symmetrically (see Figure 4). When the piston moves in the detection area of the first detection device 6, the transmitter signal thereof gradually decreases from 20mA to 4mA; when the piston moves from the measuring position boundary point 11 to the detection area of the second detection device 7, the transmitter signal of the first detection device 6 is less than 4mA, and the signal processing unit determines that the current moving position of the piston has covered the detection area of the first detection device 6 according to the change rule of the transmission signal. When the piston passes the measuring position boundary point 11 and enters the detection area of the second detection device 7, the transmitter signal of the second detection device 7 gradually increases from 4mA to 20mA. The information processing unit realizes real-time and accurate detection of the position of the large-stroke piston according to the value of the transmitter signal of the second detection device 7 and the detection value of the first detection device 6. In addition, the use of two sets of detection devices for detecting the position of the large-stroke piston is equivalent to dividing the large stroke into small strokes and configuring a separate detection device for each small stroke, thereby improving the real-time control accuracy of the piston position.

[0043] As shown in Figure 5 , in order to avoid the problem that the real-time position of the piston cannot be determined due to overflow of the transmission signal at the boundary of adjacent detection devices, the two detection devices are arranged symmetrically with each other, that is, if the first detection device 6 is placed at a normal standard position, then the second detection device 7 is placed at a position 180° away from the standard position; the installation diagram of the two detection devices arranged in series and symmetrically is shown in Figure 5 .

[0044] As shown in Figure 5 , the two sets of detection devices arranged in series and symmetrically according to the utility model mainly include: a first detection device 6, a second detection device 7, a mounting column 13, a fixing clamp 12, an electrical junction box 15, a cable joint 16 and an electrical junction box mounting connector 17. The fixing clamp 12 is provided with a first fixing clamp fastening end 18 and a second fixing end first fixing clamp fastening end 19, and the first detection device 6 and the second detection device 7 are fixed on the mounting column 13 through the first fixing clamp fastening end 18 and the second fixing clamp fastening end 19, respectively; in order to ensure the accuracy of the measurement result, the lower end of the first detection device 6 and the upper end of the second detection device 7 are overlapped by a certain distance during installation, and the installation overlapping area 14 is 50mm-100mm, and the electrical junction box 15 is connected and fixed through the mounting connector 17.

[0045] The electrical junction box 15 is an electrical junction of the first detection device 6 and the second detection device 7, wherein the electrical junction box 15 is provided with a first isolation module 15-1, a second isolation module 15-2 and a terminal 15-3; the electrical connection of the first detection device 6 is connected with the corresponding first isolation module 15-1 in the electrical junction box 15 through a cable, and the electrical connection of the second detection device 7 is connected with the second isolation module 15-2 in the electrical junction box 15 through a cable; the detection signals of the first detection device 6 and the second detection device 7 are converted by the first isolation module 15-1 and the second isolation module 15-2 respectively, and then the first isolation module 15-1 and the second isolation module 15-2 are connected with the terminal 15-3 through a cable in series, the terminal 15-3 is connected with the control unit 20 through a cable, the processing and display of the stroke measurement signal are realized, and the cable joint 16 is used for electrical connection between the two detection devices and other equipment.

[0046] When a detection device needs to be disassembled, only the fastening end of the fixed clamp on one side of the fault detection device is loosened, and the fault detection device is disassembled; after replacing a new detection device, only the fastening end of the fixed clamp on the corresponding side is fastened, so that the installation and disassembly are convenient. Meanwhile, the installation overlapping area of the two groups of detection devices can ensure that the signal transmission at the junction point of the measurement position is reliable, and accurate measurement is realized.

[0047] Referring to Figure 6 , it is a schematic diagram of electrical connection principles of two groups of detection devices arranged in series and symmetrically.

[0048] As shown in Figure 4 and Figure 6 , the electrical connection of the first detection device 6 is introduced into the corresponding first isolation module 15-1 in the electrical junction box through a cable, and the electrical connection of the second detection device 7 is introduced into the second isolation module 15-2 in the electrical junction box 15 through a cable; the signals (+) 1 and (-) 2 converted by the isolation modules are introduced onto the terminal 15-3 in series, and then the terminal 15-3 transmits the signals to the control unit 20 through a cable joint and a cable, so that the processing and display of the stroke measurement signal are realized.

[0049] The specific implementation process of the technical solution is as follows:

[0050] The installation space of the large-stroke piston accumulator spans the first space layer 4 and the second space layer 5, the first detection device 6 is installed in the first space layer 4, and the second detection device 7 is installed in the second space layer 5, and the two groups of detection devices are arranged in series and symmetrically (see Figure 2 ); the signal ranges of the transmitters are both 4mA-20mA, and the detection signals of the two groups of detection devices can fully cover the full stroke of the piston after being superimposed, so that real-time and accurate detection of the piston position during the oil filling and oil discharging processes of the large-stroke piston accumulator is realized.

[0051] AsFigure 7 As shown, during the oil filling process: when the accumulator piston is at its lowest point, the magnetic float is at the top of the accumulator reed switch. At this time, the transmitter signal of the second detection device 7 corresponds to 20mA. When the piston starts to move upward, the corresponding float starts to move downward from the top of the reed switch, and the transmitter signal of the second detection device 7 starts to change from 20mA to 4mA. When the transmitter signal of the second detection device 7 changes to about 4.0mA, it means that the piston has moved to the measurement position boundary point 11 and is moving towards the detection area of ​​the first detection device 6. At this time, the transmitter of the first detection device 6 starts to change from 4.0mA to 20mA. At the same time, the signal value of the transmitter of the second detection device 7 will be lower than 4.0mA. This indicates that the piston stroke has exceeded the full range detection range of the second detection device 7 and entered the detection range of the first detection device 6. It also indicates that the piston stroke is the sum of the full range of the second detection device 7 and the current detection range of the first detection device 6, which represents the real-time oil level during the accumulator filling process.

[0052] like Figure 8 As shown, during the oil release process: when the accumulator piston is at its highest point, the magnetic float is at the lowest point of the accumulator reed switch (see below). Figure 8 At this point, the transmitter of the first detection device 6 corresponds to approximately 20mA. When the piston begins to move downwards, the corresponding float begins to move upwards from the top of the reed switch. When the transmitter of the first detection device 6 begins to change from 20mA to approximately 4mA, it indicates that the piston has reached the measurement position boundary point 11 and is moving towards the detection area of ​​the second detection device 7. At this time, the transmitter of the second detection device 7 begins to change from 4.0mA to 20mA. Simultaneously, the signal value of the transmitter of the first detection device 6 will decrease to a value less than 4mA. In this case, on the one hand, it indicates that the piston stroke has fully covered the full range of the first detection device 6, and on the other hand, it indicates that the piston stroke is the sum of the full range of the first detection device 6 and the current detection range of the second detection device 7. After calculation and analysis by the signal processing unit, the real-time oil level of the oil discharge quantity can be obtained.

[0053] This utility model has a compact structure and reasonable design, and can monitor the position signal of the long-stroke piston in real time with precision. At the same time, the first detection device 6 and the second detection device 7, which are symmetrically placed in series, are installed in different three-dimensional spaces, without any regional crossing. This makes it easy to maintain, disassemble and replace, which greatly improves the performance stability and reliability of the accumulator, reduces its failure rate, and provides a strong guarantee for the overall stable operation of the system.

[0054] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are equivalent to the embodiments. Any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A device for solving the position detection of a large-stroke piston, which is placed symmetrically in series, characterized in that: The application relates to a stroke detection device for a large-stroke piston accumulator, which comprises a first detection device (6) and a second detection device (7), the first detection device (6) is arranged on a first space layer (1) spanned by the large-stroke piston accumulator mounting space, the second detection device (7) is arranged on a second space layer (2) spanned by the large-stroke piston accumulator mounting space, the first detection device (6) and the second detection device (7) are arranged in series and symmetrically, that is, the first detection device (6) is placed at a normal standard position, and then the second detection device (7) is placed at a position 180 DEG away from the standard position, the two detection devices are arranged on the same horizontal line or vertical line, and the two detection devices are connected end to end, the transmission signals of the two detection devices at the connection position are all 4mA, wherein the signal transmission amount of one group of detection devices gradually decreases from 20mA to below 4mA, and the signal transmission amount of the other group of detection devices gradually increases from 4mA to 20mA, in the stroke detection area of one detection device, the signal transmission range change rule is 4-20mA, and in the stroke detection area of the other detection device, the signal transmission range change rule is 20-4mA.

2. The device for solving the problem of position detection of a large-stroke piston symmetrically placed in series according to claim 1, characterized in that: The application also comprises a mounting column (13), a fixed clamp (12), an electrical junction box (15), a cable joint (16) and an electrical junction box mounting connector (17), wherein the fixed clamp (12) is provided with a first fixed clamp fastening end (18) and a second fixed clamp fastening end (19), the first detection device (6) and the second detection device (7) are fixed on the mounting column (13) through the first fixed clamp fastening end (18) and the second fixed clamp fastening end (19) respectively, the lower end of the first detection device (6) overlaps the upper end of the second detection device (7) to form an installation overlapping area (14), the installation overlapping area is 50mm-100mm, and the electrical junction box (15) is connected and fixed through the mounting connector (17).

3. The device for solving the problem of position detection of a large-stroke piston symmetrically placed in series according to claim 2, characterized in that The electrical junction box (15) is an electrical junction collection of the first detection device (6) and the second detection device (7), wherein the electrical junction box (15) is provided with a first isolation module (15-1), a second isolation module (15-2) and a wiring terminal (15-3), the electrical junction of the first detection device (6) is connected with the corresponding first isolation module (15-1) in the electrical junction box (15) through a cable, the electrical junction of the second detection device (7) is connected with the isolation module (15-2) in the electrical junction box (15) through a cable, the detection signals of the first detection device (6) and the second detection device (7) are converted through the first isolation module (15-1) and the second isolation module (15-2) respectively, the first isolation module (15-1) and the second isolation module (15-2) are connected with the wiring terminal (15-3) through a cable in a series connection mode, the wiring terminal (15-3) is connected with a control unit (20) through a cable, stroke measurement signals are processed and displayed, and the cable joint (16) is an electrical connection between the two detection devices and other equipment.

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