A pressure measurement module and sensor

Abstract

The embodiment of the present invention discloses a pressure measuring module and a sensor, which relate to the field of machinery and control. The invention is to provide a pressure measuring module and a sensor installed inside an oil cylinder. The pressure measuring module comprises: a housing, a pressure measuring core is provided inside the housing, a pressure conducting hole is provided at the first end of the pressure measuring core, and a signal processing module is provided at the second end of the pressure measuring core; the pressure measuring core is electrically connected to the signal processing module. It is suitable for application scenarios of measuring the pressure value of an oil cylinder.

Description

Technical Field

[0001] The present invention relates to the field of mechanical and control technology, and in particular to a pressure measurement module and a sensor. Background Art

[0002] For the oil cylinder, its pressure value is an important action state parameter. Generally, a tee is installed at the oil cylinder inlet and a sensor is connected to the tee to measure the pressure value of the oil cylinder. This method is more flexible, but it requires a corresponding space to be reserved outside the oil cylinder for installing the sensor, which takes up space and is easily damaged during use. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a pressure measurement module and a sensor installed inside a cylinder.

[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a pressure measurement module, comprising: a shell, a pressure measurement core is arranged in the shell, a pressure conducting hole is arranged at the first end of the pressure measurement core, and a signal processing module is arranged at the second end of the pressure measurement core; the pressure measurement core is electrically connected to the signal processing module.

[0006] According to a specific implementation of an embodiment of the present invention, the pressure measuring core includes a pressure film, and the pressure film is electrically connected to the pressure measuring core; when pressure liquid enters the pressure conducting hole, the pressure film is deformed, causing the pressure measuring core to generate an electrical signal.

[0007] According to a specific implementation of the embodiment of the present invention, the signal processing module includes a signal amplification module, which is used to amplify the electrical signal generated by the pressure measurement core.

[0008] According to a specific implementation manner of the embodiment of the present invention, the pressure film is welded or bonded to the shell as a whole.

[0009] According to a specific implementation manner of the embodiment of the present invention, a sealing groove is provided on the outer side of the shell, and a sealing member is provided in the sealing groove.

[0010] According to a specific implementation of the embodiment of the present invention, the shell and the seal are made of corrosion-resistant material.

[0011] In a second aspect, an embodiment of the present invention provides a sensor, comprising a pressure measurement module as described in any one of the first aspects, and further comprising: a data processing module and a base, wherein a mounting hole is provided at a first end of the base, the pressure measurement module is located in the mounting hole, the data processing module is located at a second end of the base, and the pressure measurement module and the data processing module are electrically connected.

[0012] According to a specific implementation method of an embodiment of the present invention, the data processing module includes a signal adjustment module, an analog-to-digital conversion module and a main control unit, the signal processing module is electrically connected to the signal adjustment module, the signal adjustment module is electrically connected to the analog-to-digital conversion module, and the analog-to-digital conversion module is electrically connected to the main control unit; when the signal adjustment module receives the electrical signal of the signal processing module, it adjusts the electrical signal and transmits the adjusted electrical signal to the analog-to-digital conversion module, and the analog-to-digital conversion module transmits the converted second digital signal to the main control unit.

[0013] According to a specific implementation of an embodiment of the present invention, the mounting hole is provided at the first end of the base, and the mounting hole is a stepped hole, including a first through hole and a second through hole, a stepped surface is provided between the second end of the first through hole and the first end of the second through hole, and the aperture of the first through hole is larger than the aperture of the second through hole; the pressure measurement includes a shell and a signal processing module, the shell of the pressure measurement module is located in the first through hole and abuts against the stepped surface; the signal processing module is located in the second through hole; a mounting groove is provided at the second end of the base, the data processing module is placed in the mounting groove, the bottom of the mounting groove is connected to the second end of the second through hole, and the signal processing module of the pressure measurement module is electrically connected to the data processing module through a cable; a cover plate is provided at the notch of the mounting groove, a second sealing groove is provided at the edge of the notch, a second sealing member is provided in the second sealing groove, and the cover plate is provided above the second sealing member.

[0014] In a pressure measurement module and a sensor provided by an embodiment of the present invention, a pressure liquid can contact a pressure measurement core along a pressure conducting hole, and the pressure measurement core generates a corresponding electrical signal according to the pressure value of the liquid, and transmits the electrical signal to a signal processing module, and the pressure value of the liquid can be obtained by processing the electrical signal. In this way, the pressure measurement module and the sensor are installed on the oil cylinder base, and the oil cylinder is connected to the pressure conducting hole, and the pressure liquid in the oil cylinder can enter the pressure conducting hole, thereby obtaining the pressure value of the oil cylinder, so the pressure measurement module and the sensor can be installed in the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The figure is a cross-sectional view of a sensor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1

[0020] An embodiment of the present invention provides a pressure measurement module, comprising: a shell, a pressure measurement core is arranged in the shell, a pressure conducting hole is arranged at the first end of the pressure measurement core, and a signal processing module is arranged at the second end of the pressure measurement core; the pressure measurement core is electrically connected to the signal processing module.

[0021] Specifically, the pressure liquid can contact the pressure measuring core along the pressure conducting hole, and the pressure measuring core generates a corresponding electrical signal according to the pressure value of the liquid, and transmits the electrical signal to the signal processing module, and the pressure value of the liquid can be obtained by processing the electrical signal. In this way, the pressure measuring module and the sensor are installed on the oil cylinder base, and the oil cylinder is connected to the pressure conducting hole, and the pressure liquid in the oil cylinder can enter the pressure conducting hole, thereby obtaining the pressure value of the oil cylinder, so the pressure measuring module and the sensor can be installed in the oil cylinder.

[0022] In one embodiment, the pressure measuring core includes a pressure film, and the pressure film is electrically connected to the pressure measuring core; when pressure liquid enters the pressure conducting hole, the pressure film is deformed, causing the pressure measuring core to generate an electrical signal.

[0023] Specifically, the pressure conducting hole connects the pressure film with the outside world, so that the liquid in the oil cylinder can contact the pressure film along the pressure conducting hole, thereby causing the pressure film to deform. The pressure film is electrically connected to the pressure measuring core. When the pressure film is deformed, it can generate an electrical signal and transmit the electrical signal to the pressure measuring core. By processing the electrical signal, the pressure value of the oil cylinder can be obtained.

[0024] In one embodiment, in order to enhance the stability of signal transmission, the signal processing module includes a signal amplification module for amplifying the electrical signal generated by the pressure measurement core.

[0025] The electrical signal generated by the contact between the pressure liquid and the pressure measuring core, especially the electrical signal generated when the pressure film is deformed, is extremely weak. Therefore, the electrical signal is first transmitted to the signal processing module 24 through the pressure measuring core for amplification and processing, and then transmitted to the data processing module 30. This is conducive to enhancing the stability of electrical signal transmission.

[0026] In one embodiment, the pressure film is welded or bonded to the shell as a whole.

[0027] In one embodiment, a sealing groove is provided on the outer side of the shell, and a sealing member is provided in the sealing groove.

[0028] It is understandable that the pressure measurement module is mounted on the sensor, and the seal is in contact with the sensor. Specifically, the liquid in the oil cylinder includes hydraulic oil, emulsion, etc., which has a certain corrosiveness. The signal processing module is isolated from the liquid in the oil cylinder by the seal, so that the signal processing module can be prevented from being damaged. In addition, because the pressure measurement module is immersed in the liquid in the oil cylinder, in order to ensure the performance of the pressure measurement module, in one embodiment, the shell of the pressure measurement module and the seal outside the shell are made of corrosion-resistant materials.

[0029] Embodiment 2

[0030] See also Figure 1 An embodiment of the present invention provides a sensor, comprising the pressure measurement module described in any one of Embodiment 1, and further comprising: a data processing module 10 and a base 20, wherein a mounting hole is provided at the first end of the base, the pressure measurement module is located in the mounting hole, the data processing module is located at the second end of the base, and the pressure measurement module is electrically connected to the data processing module.

[0031] Specifically, the pressure measurement module can convert the pressure information of the oil cylinder into an electrical signal and transmit it to the data processing module. The data processing module can obtain the pressure value of the oil cylinder by processing the electrical signal.

[0032] In one embodiment, the data processing module includes a signal conditioning module, an analog-to-digital conversion module and a main control unit, the signal processing module is electrically connected to the signal conditioning module, the signal conditioning module is electrically connected to the analog-to-digital conversion module, and the analog-to-digital conversion module is electrically connected to the main control unit; when the signal conditioning module receives the electrical signal from the signal processing module, it adjusts the signal and transmits the adjusted electrical signal to the analog-to-digital conversion module, and the analog-to-digital conversion module transmits the converted second digital signal to the main control unit.

[0033] The signal conditioning module includes an amplification module and a filtering module. The electrical signal transmitted from the signal processing module to the signal conditioning module is first amplified and then filtered. Specifically, the signal processing module is connected to an output interface, and the electrical signal is transmitted to the signal conditioning module via the output interface. Among them, the filtering module can be a commonly used low-pass filter including a Butterworth filter and a Chebyshev filter; the amplification factor of the amplification module is jointly determined by the electrical signal it receives and the input voltage of the analog-to-digital conversion module. It should be noted that the voltage value of the electrical signal amplified by the amplification module should be lower than the maximum input value of the analog-to-digital conversion module.

[0034] The main control unit processes the digital signal. Therefore, after the electrical signal is processed by the signal conditioning module, it is processed by the analog-to-digital conversion module, converted into a second digital signal, and transmitted to the main control unit. The main control unit can obtain the liquid pressure on the pressure film by processing the second digital signal, thereby obtaining the cylinder pressure. The digital signal is transmitted to the main control unit via a digital signal interface, which can be SPI or IIC.

[0035] In one embodiment, the mounting hole is provided at the first end of the base, and the mounting hole is a stepped hole, including a first through hole and a second through hole, a stepped surface is provided between the second end of the first through hole and the first end of the second through hole, and the aperture of the first through hole is larger than the aperture of the second through hole; the pressure measurement includes a shell 31 and a signal processing module 32, the shell 31 of the pressure measurement module is located in the first through hole and abuts against the stepped surface; the signal processing module 32 is located in the second through hole; a mounting groove 21 is provided at the second end of the base, the data processing module is placed in the mounting groove 21, the bottom of the mounting groove 21 is connected to the second end of the second through hole, and the signal processing module of the pressure measurement module is electrically connected to the data processing module through a cable 33; a cover plate is provided at the notch of the mounting groove 21, a second sealing groove is provided at the edge of the notch, a second sealing member is provided in the second sealing groove, and the cover plate is provided above the second sealing member.

[0036] Specifically, an internal thread is provided on the hole wall of the third through hole of the first mounting hole, an external thread is provided on the side of the shell of the pressure measuring module, and the pressure measuring module and the base are fixedly connected as a whole through a threaded connection. Among them, the stepped surface between the third through hole and the fourth through hole has a positioning function. Specifically, when the shell of the pressure measuring module abuts against the stepped surface, the applied external force cannot cause the pressure measuring module and the base to continue to be tightened, which can prevent the threaded connection between the pressure measuring module and the base from failing due to excessive force.

[0037] In one embodiment, the sensor also includes a displacement measurement module, which includes a motion measurement mechanism, a motion conversion mechanism and an encoder; the motion measurement structure includes a pull rope and a threaded column, the pull rope is connected to the threaded column, and the threaded column is fixedly connected to the piston rod; the motion conversion structure includes a mounting seat, a support column, a fixed pulley, a rotating table and a top plate, at least one of the support columns is provided, the mounting seat is fixedly arranged at the first end of the base, the top plate is arranged parallel to the top of the mounting seat, the support column is vertically arranged between the mounting seat and the top plate, and the support columns are respectively arranged at the end face of the mounting seat and the edge of the top plate, and the fixed pulley is passed through the support column; the rotating table is located at A connecting column is arranged on the mounting seat between the top plate and the mounting seat and above the edge of the first through hole, wherein the rotating table is columnar, and a flange is provided on the side of the rotating table and at the edge near one end of the first through hole; the rope body of the pull rope is wound around the rotating table, one end of the pull rope passes through the fixed pulley and is fixedly connected to the threaded column, a second through hole is provided on the top plate, and the threaded column passes through the second through hole and is fixedly connected to the piston rod; a first through hole is provided on the mounting seat, and a second mounting hole is provided on the base, the first through hole is communicated with the second mounting hole, and the encoder is located in the second mounting hole; the motion measuring device is located inside the rotating table and is arranged corresponding to the encoder.

[0038] The displacement measurement module can be installed at the bottom of the rodless chamber of the oil cylinder.

[0039] Specifically, because the threaded column is fixedly connected to the piston rod, when the piston rod of the oil cylinder makes a linear motion, the threaded column and the piston rod make a synchronous linear motion, driving the pull rope to move. Because the pull rope is wound on the rotating table, the pull rope drives the rotating table to rotate. In this way, it can be said that the piston rod of the oil cylinder drives the rotating table to rotate, so the information of the linear motion of the piston rod of the oil cylinder can be calculated based on the rotational motion of the rotating table.

[0040] It should be noted that, in this article, the emphasis of the scheme described in each embodiment is different, but each embodiment has a certain interrelated relationship. When understanding the scheme of the present invention, each embodiment can refer to each other; in addition, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A sensor, It is characterized in that The pressure measuring module comprises: a housing, a pressure measuring core is arranged in the housing, a pressure conducting hole is arranged at a first end of the pressure measuring core, and a signal processing module is arranged at a second end of the pressure measuring core; The pressure measurement core is electrically connected to the signal processing module; A sealing groove is provided on the outer side of the housing, a sealing member is provided in the sealing groove, the pressure measuring module is installed on the sensor, the sealing member abuts against the sensor, and the pressure measuring module and the sensor are installed in the oil cylinder; the sealing member is used to isolate the signal processing module from the liquid in the oil cylinder; The pressure measurement core comprises a pressure film, and the pressure film is electrically connected to the pressure measurement core; When pressure liquid enters the pressure conducting hole, the pressure film is deformed, causing the pressure measuring core to generate an electrical signal; The signal processing module includes a signal amplification module for amplifying the electrical signal generated by the pressure measurement core; The pressure film is welded or bonded to the shell as a whole; The shell and the seal are made of corrosion-resistant materials; It also includes: a data processing module and a base, wherein a mounting hole is provided at a first end of the base, the pressure measuring module is located in the mounting hole, the data processing module is located at a second end of the base, and the pressure measuring module is electrically connected to the data processing module; Wherein, when measuring, the pressure measurement module and the sensor are installed on the oil cylinder base, the oil cylinder is connected to the pressure conducting hole, the pressure liquid in the oil cylinder can contact the pressure measurement core along the pressure conducting hole, the pressure measurement core generates a corresponding electrical signal according to the pressure value of the liquid, and transmits the electrical signal to the data processing module, and the data processing module obtains the pressure value of the oil cylinder by processing the electrical signal; It also includes a displacement measurement module, which includes a motion measurement mechanism, a motion conversion mechanism and an encoder; the motion measurement mechanism includes a pull rope and a threaded column, the pull rope is connected to the threaded column, and the threaded column is fixedly connected to the piston rod; the motion conversion mechanism includes a mounting seat, a support column, a fixed pulley, a rotating table and a top plate, at least one of the support columns is provided, the mounting seat is fixedly arranged at the first end of the base, the top plate is arranged parallel to the mounting seat above the mounting seat, the support column is vertically arranged between the mounting seat and the top plate, and the support columns are respectively arranged at the end face of the mounting seat and the edge of the top plate, and the fixed pulley is passed through the support column; a first through hole is provided on the mounting seat A hole, a second mounting hole is provided on the base, the first through hole is communicated with the second mounting hole, and the encoder is located in the second mounting hole; the motion measuring mechanism is located inside the rotating table, and is arranged corresponding to the encoder; the rotating table is located between the top plate and the mounting seat, above the edge of the first through hole, and is arranged on the mounting seat through a connecting column, wherein the rotating table is columnar, and a flange is provided on the side of the rotating table, near the edge of one end of the first through hole; the rope body of the pull rope is wound around the rotating table, one end of the pull rope passes through the fixed pulley and is fixedly connected to the threaded column, a second through hole is provided on the top plate, and the threaded column passes through the second through hole and is fixedly connected to the piston rod; Wherein, the displacement measurement module is installed at the bottom of the rodless chamber of the oil cylinder.

2. The sensor according to claim 1, It is characterized in that The data processing module includes a signal conditioning module, an analog-to-digital conversion module and a main control unit, the signal processing module is electrically connected to the signal conditioning module, the signal conditioning module is electrically connected to the analog-to-digital conversion module, and the analog-to-digital conversion module is electrically connected to the main control unit; When the signal adjustment module receives the electrical signal from the signal processing module, it adjusts the electrical signal and transmits the adjusted electrical signal to the analog-to-digital conversion module, and the analog-to-digital conversion module transmits the converted second digital signal to the main control unit.

3. The sensor according to claim 1, It is characterized in that The mounting hole is provided at the first end of the base, and the mounting hole is a stepped hole, including a third through hole and a fourth through hole, a stepped surface is provided between the second end of the third through hole and the first end of the fourth through hole, and the aperture of the third through hole is larger than the aperture of the fourth through hole; the pressure measurement includes a shell and a signal processing module, the shell of the pressure measurement module is located in the third through hole and abuts against the stepped surface; the signal processing module is located in the fourth through hole; A mounting groove is provided at the second end of the base, the data processing module is placed in the mounting groove, the bottom of the mounting groove is connected to the second end of the fourth through hole, and the signal processing module of the pressure measurement module is electrically connected to the data processing module through a cable; A cover plate is provided at the slot opening of the installation slot, a second sealing slot is provided at the edge of the slot opening, a second sealing member is provided in the second sealing slot, and the cover plate is provided above the second sealing member.

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