Integrated sensor for measuring pressure displacement

Abstract

The invention belongs to the technical field of mechanical hydraulic pressure, and particularly relates to an integrated sensor for measuring pressure displacement, which comprises a shell used for being detachably mounted on the cylinder bottom of a hydraulic cylinder, the shell comprises a first mounting hole and a second mounting hole, and the shell is provided with a damping hole communicated with the first mounting hole; the pressure measuring assembly is arranged in the first mounting hole, the damping hole is used for being communicated with a rodless cavity of the hydraulic cylinder, oil is fed through the rodless cavity, and oil extrudes the pressure measuring assembly through the damping hole, so that the pressure measuring assembly obtains pressure data of oil in the hydraulic cylinder; and the displacement measuring assembly is arranged in the second mounting hole, and the displacement measuring assembly is used for transmitting a measuring signal to a piston rod of the hydraulic cylinder so as to obtain displacement data of the piston rod. The device is simple in structure and convenient to use, non-contact distance measurement is achieved, the piston rod punching process is avoided, and the device is an improvement on the prior art. The device is suitable for various scenes of pressure and displacement measurement of the hydraulic cylinder.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical hydraulics, and particularly relates to an integrated sensor for measuring pressure and displacement. Background Art

[0002] The measurement of the pressure and displacement of a hydraulic cylinder plays an important role in the recognition of the mechanical posture of the hydraulic cylinder. The working conditions of the hydraulic cylinder are complex, and the disassembly and installation are relatively cumbersome.

[0003] When the measurement devices disclosed in the prior art measure the pressure and displacement of a hydraulic cylinder, drilling operations need to be carried out on the piston rod of the hydraulic cylinder, which will damage the hydraulic cylinder and the installation process is complex.

[0004] Therefore, it is necessary to design an integrated sensor for measuring pressure and displacement to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated sensor for measuring pressure and displacement to solve the above problems and achieve the purpose of improving the measurement efficiency without damaging the hydraulic cylinder.

[0006] To achieve the above purpose, the present invention provides the following solution: An integrated sensor for measuring pressure and displacement, including a housing for detachably mounting on the bottom of a hydraulic cylinder. The housing includes a first mounting hole and a second mounting hole, and a damping hole communicating with the first mounting hole is provided on the housing; a pressure measurement component is arranged in the first mounting hole, and the damping hole is used for communicating with the rodless cavity of the hydraulic cylinder. Oil enters through the rodless cavity, and the oil squeezes the pressure measurement component through the damping hole so that the pressure measurement component obtains the oil pressure data in the hydraulic cylinder; a displacement measurement component is arranged in the second mounting hole, and the displacement measurement component is used for transmitting a measurement signal to the piston rod of the hydraulic cylinder to obtain the displacement data of the piston rod.

[0007] Based on the integrated sensor for measuring pressure and displacement of the present invention, the pressure measurement component includes a pressure sensor, and the pressure sensor is detachably mounted in the first mounting hole provided on the housing, and the probe of the pressure sensor faces the damping hole.

[0008] Based on the integrated sensor for measuring pressure and displacement of the present invention, the damping hole is a linear hole channel, and the damping hole is parallel to the axis of the rodless cavity of the hydraulic cylinder.

[0009] Based on the integrated sensor for measuring pressure and displacement of the present invention, a compression plug is threadedly connected to one end of the housing away from the damping hole, and one end of the compression plug presses on the surface of the pressure sensor.

[0010] An integrated sensor for measuring pressure and displacement based on the present invention, a second sealing groove is formed on the outer side wall of the pressure sensor, a second sealing member is arranged in the second sealing groove, and the outer surface of the second sealing member abuts against the inner wall of the first mounting hole.

[0011] An integrated sensor for measuring pressure and displacement based on the present invention, the displacement measurement assembly includes a displacement sensor, and the displacement sensor is detachably installed in a second mounting hole formed inside the housing.

[0012] An integrated sensor for measuring pressure and displacement based on the present invention, the pressure sensor is wired or wireless, and the displacement sensor is wired or wireless.

[0013] An integrated sensor for measuring pressure and displacement based on the present invention, when the pressure sensor and the displacement sensor are wired, a sensor wire outlet is formed on the bottom of the cylinder, and the wires of the pressure sensor and the displacement sensor are led out to the outside through the sensor wire outlet.

[0014] An integrated sensor for measuring pressure and displacement based on the present invention, a first sealing groove is formed on the housing, a first sealing member is arranged in the first sealing groove, and the outer surface of the first sealing member abuts against the side wall of the cylinder body of the hydraulic cylinder.

[0015] An integrated sensor for measuring pressure and displacement based on the present invention, the displacement sensor is used to emit ultrasonic signals to the piston to obtain displacement data of the piston rod.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The present invention designs the pressure measurement assembly and the displacement measurement assembly in the same housing, with a simple and compact structure. The pressure measurement assembly is designed to communicate with the oil chamber of the hydraulic cylinder, and no additional tee is required during pressure measurement. The displacement measurement assembly of the present invention does not require processing of the piston rod, improving the service life. The present invention is convenient for installation and disassembly on the bottom of the cylinder, and requires less time for maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0019] Figure 1 It is a schematic diagram of the whole of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic installation view of the present invention inside a hydraulic cylinder.

[0022] Wherein, 1 is a housing; 2 is a compression plug; 3 is a pressure sensor; 4 is a displacement sensor; 5 is a first mounting hole; 6 is a second mounting hole; 7 is a damping hole; 8 is a first sealing groove; 9 is a first seal; 10 is a second sealing groove; 11 is a second seal; 12 is a cylinder bottom; 13 is a sensor wire outlet; 14 is a piston; 15 is a piston rod. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Referring to Figures 1 to 3 As shown, the present invention provides an integrated sensor for measuring pressure and displacement, including a housing 1 for detachably mounting on the cylinder bottom 12 of a hydraulic cylinder. The housing 1 includes a first mounting hole 5 and a second mounting hole 6, and a damping hole 7 is provided on the housing 1 and communicates with the first mounting hole 5; a pressure measurement component is arranged in the first mounting hole 5, and the damping hole 7 is used to communicate with the rodless cavity of the hydraulic cylinder. Oil enters through the rodless cavity, and the oil squeezes the pressure measurement component through the damping hole 7 so that the pressure measurement component obtains the oil pressure data inside the hydraulic cylinder; a displacement measurement component is arranged in the second mounting hole 6, and the displacement measurement component is used to emit a measurement signal to the piston rod 15 of the hydraulic cylinder to obtain the displacement data of the piston rod 15.

[0026] The housing 1 is connected to the cylinder bottom 12 by a thread. The outer shape of the housing 1 can be reduced to be applicable to a smaller hydraulic cylinder, and at the same time, the sealing type is changed.

[0027] Further, the pressure measurement component includes a pressure sensor 3, and the pressure sensor 3 is detachably mounted in the first mounting hole 5 provided on the housing 1, and the probe of the pressure sensor 3 faces the damping hole 7.

[0028] Further, the damping hole 7 is a linear hole channel, and the damping hole 7 is parallel to the axis of the rodless cavity of the hydraulic cylinder.

[0029] Further, a compression plug 2 is threadedly connected to one end of the housing 1 away from the damping hole 7, and one end of the compression plug 2 presses against the surface of the pressure sensor 3.

[0030] The pressure sensor 3 is in contact with the hydraulic oil in the hydraulic cylinder through the damping hole 7 for pressure measurement.

[0031] Further, a second sealing groove 10 is formed in the outer side wall of the pressure sensor 3, a second sealing member 11 is arranged in the second sealing groove 10, and the outer surface of the second sealing member 11 abuts against the inner wall of the first mounting hole 5.

[0032] The second sealing member 11 contacts the inner side wall of the first mounting hole 5 to prevent liquid leakage.

[0033] Further, the displacement measurement assembly includes a displacement sensor 4, and the displacement sensor 4 is detachably installed in a second mounting hole 6 formed inside the housing 1, and the second mounting hole 6 is not communicated with the hydraulic oil chamber of the hydraulic cylinder.

[0034] Further, the pressure sensor 3 is wired or wireless, and the displacement sensor 4 is wired or wireless.

[0035] Further, when the pressure sensor 3 and the displacement sensor 4 are wired, a sensor wire outlet 13 is formed in the cylinder bottom 12, and the wires of the pressure sensor 3 and the displacement sensor 4 are led out to the outside through the sensor wire outlet 13.

[0036] When the pressure sensor 3 and the displacement sensor 4 are wired, wiring is carried out through the sensor wire outlet 13. The fixing method of the displacement sensor 4 is glue mounting, which does not affect wire outlet.

[0037] Further, a first sealing groove 8 is formed in the housing 1, a first sealing member 9 is arranged in the first sealing groove 8, and the outer surface of the first sealing member 9 abuts against the side wall of the cylinder body of the hydraulic cylinder.

[0038] The first sealing member 9 contacts the cylinder bottom 12 to prevent liquid leakage.

[0039] From Figure 1 As can be seen from the content represented, the outer shape of the housing 1 is hexagonal. At this time, the first sealing groove 8 is formed on the end face of the hexagon. In the actual use process, the hexagon can also be changed to a circle, and the counterbore circle can be changed to a hexagon, so that the sealing of the housing 1 can be changed to sealing on the cylindrical surface.

[0040] Further, the displacement sensor 4 is used to emit ultrasonic signals to the piston 14 to obtain the displacement data of the piston rod 15.

[0041] The displacement sensor 4 is an ultrasonic displacement sensor.

[0042] Ultrasonic data processing:

[0043] The hardware circuit includes an ultrasonic drive circuit, a received signal quantity circuit, a main controller, etc. The high-frequency ultrasonic evaluation board is equipped with a boost chip, which can select the boosted voltage according to requirements. After boosting, it passes through a transformer, and the high-voltage PWM output is realized by controlling the switching of the MOSFET, thereby driving the ultrasonic sensor to generate high-frequency ultrasonic signals. For the received signal processing, the ultrasonic signals received by the transducer are processed. The waveform signals of suitable frequencies are selected through a band-pass filter, and then the ultrasonic signals are converted into level signals through a comparator or an operational amplifier. The main controller calculates the flight time of the ultrasonic wave by detecting the level signals.

[0044] The ultrasonic signal travels through the housing 1 in the hydraulic oil, reflects on the surface of the piston 14 when it encounters it, and the echo signal is received by the transducer. Through the processing of the echo signal, the relevant signals are given to the main controller MCU. The MCU obtains the ultrasonic flight time t by calculating the ultrasonic generation time and the echo time. According to the fixed sound speed v in the medium, the distance l between the ultrasonic probe and the surface of the piston 14 can be measured, where l = v×t. Then, the hydraulic cylinder is fully retracted, and the distance l0 is measured at this time, and the displacement x of the piston rod of the hydraulic cylinder can be obtained, where x = l - l0.

[0045] When using the present invention to measure the hydraulic cylinder, if the piston rod 15 of the hydraulic cylinder has been drilled, only the orifice needs to be blocked, and no other modifications to the hydraulic cylinder are required.

[0046] In summary, for the integrated sensor of the present invention, by installing the pressure sensor 3 in the first mounting hole 5, it can be in contact with the liquid pressure in the hydraulic cylinder through the damping hole 7, so as to measure the liquid pressure in the oil cylinder; by installing the displacement sensor 4 in the second mounting hole 6, the distance between the integrated sensor and the piston 14 can be measured, thereby obtaining the stroke of the hydraulic cylinder. In this way, the integrated sensor can obtain the displacement and pressure data of the hydraulic cylinder.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0048] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. An integrated sensor for measuring pressure displacement, characterized in that, It includes a housing (1) for detachably mounting on the bottom (12) of a hydraulic cylinder. The housing (1) includes a first mounting hole (5) and a second mounting hole (6), and a damping hole (7) communicating with the first mounting hole (5) is provided on the housing (1); a pressure measurement assembly is arranged in the first mounting hole (5), the damping hole (7) is used to communicate with the rodless cavity of the hydraulic cylinder, oil enters through the rodless cavity, and the oil squeezes the pressure measurement assembly through the damping hole (7) so that the pressure measurement assembly obtains the oil pressure data in the hydraulic cylinder; a displacement measurement assembly is arranged in the second mounting hole (6), and the displacement measurement assembly is used to emit a measurement signal to the piston rod (15) of the hydraulic cylinder to obtain the displacement data of the piston rod (15).

2. The integrated sensor for measuring pressure displacement according to claim 1, characterized in that, The pressure measurement assembly includes a pressure sensor (3), and the pressure sensor (3) is detachably mounted in the first mounting hole (5) provided on the housing (1), and the probe of the pressure sensor (3) faces the damping hole (7).

3. The integrated sensor for measuring pressure displacement according to claim 2, characterized in that, The damping hole (7) is a linear hole passage, and the damping hole (7) is parallel to the axis of the rodless cavity of the hydraulic cylinder.

4. The integrated sensor for measuring pressure displacement according to claim 3, characterized in that, A pressing plug (2) is threadedly connected to one end of the housing (1) away from the damping hole (7), and one end of the pressing plug (2) presses on the surface of the pressure sensor (3).

5. The integrated sensor for measuring pressure displacement according to claim 2, characterized in that, A second sealing groove (10) is provided on the outer side wall of the pressure sensor (3), a second sealing member (11) is arranged in the second sealing groove (10), and the outer surface of the second sealing member (11) abuts against the inner wall of the first mounting hole (5).

6. The integrated sensor for measuring pressure displacement according to claim 2, characterized in that, The displacement measurement assembly includes a displacement sensor (4), and the displacement sensor (4) is detachably mounted in the second mounting hole (6) provided inside the housing (1).

7. The integrated sensor for measuring pressure displacement according to claim 6, characterized in that, The pressure sensor (3) is wired or wireless, and the displacement sensor (4) is wired or wireless.

8. The integrated sensor for measuring pressure displacement according to claim 7, characterized in that, When the pressure sensor (3) and the displacement sensor (4) are wired, a sensor wire outlet (13) is provided on the bottom (12) of the cylinder, and the wires of the pressure sensor (3) and the displacement sensor (4) are led out to the outside through the sensor wire outlet (13).

9. The integrated sensor for measuring pressure displacement according to claim 1, characterized in that, A first sealing groove (8) is provided on the housing (1), a first sealing member (9) is arranged in the first sealing groove (8), and the outer surface of the first sealing member (9) abuts against the side wall of the cylinder body of the hydraulic cylinder.

10. The integrated sensor for measuring pressure displacement according to claim 6, characterized in that, The displacement sensor (4) is used to emit an ultrasonic signal to the piston (14) to obtain the displacement data of the piston rod (15).

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