Pressure sensor and pressure measuring system

Abstract

The utility model relates to the technical field of pressure between roll shafts, in particular to a pressure sensor and a pressure measuring system. A pressure sensor comprises a body, a pressure sensitive element is arranged in the body, the body is suitable for being arranged in a gap of a roll shaft set, the roll shaft set comprises a first roll shaft and a second roll shaft, a gap is reserved between the first roll shaft and the second roll shaft, the two faces of the body make contact with the roll face of the first roll shaft and the roll face of the second roll shaft respectively, and in the testing state, the pressure sensitive element is arranged in the body. The pressure sensitive element is used for sensing first pressure of a first position of the roll shaft assembly, and / or the pressure sensitive element is used for sensing second pressure of a second position of the roll shaft assembly. The utility model provides a pressure sensor and a pressure measurement system, and aims to solve the problems that when the pressure difference of a roll shaft group composed of two roll shafts is measured, if each roll shaft is provided with a strain gauge, only the pressure value of the position can be measured, and the measurement result is inaccurate due to the existence of measurement errors.

Description

Technical Field

[0001] This utility model relates to the field of pressure technology between rollers, specifically to a pressure sensor and a pressure measurement system. Background Technology

[0002] In modern industrial production, it is often necessary to accurately measure the pressure between two rollers, such as in mechanical transmission and conveying systems in industries like coating machines, rotary screen printing machines, digital printers, mining conveying equipment, and papermaking. If the two rollers are not parallel, the pressure at both ends will be inconsistent, which can easily cause material wrinkling and uneven material thickness, seriously affecting product quality.

[0003] Measuring pressure between smooth, parallel cylindrical rollers (with a spacing of less than 20 mm) requires rapid alignment and accurate measurement, which is a challenging task. Currently, roller pressure measurement often involves attaching strain gauges to the roller surface or placing them within the roller shaft. This results in the strain gauge only being able to measure the pressure of one roller. When measuring the pressure difference between two rollers, if a strain gauge is placed on each roller, it not only measures the pressure at that location but also leads to inaccurate results due to measurement errors. Utility Model Content

[0004] In view of this, the present invention provides a pressure sensor and a pressure measurement system to solve the problem that when measuring the pressure difference of a roller pair consisting of two rollers, if a strain gauge is set on each roller, only the pressure value at that position can be measured, and the measurement result will be inaccurate due to the existence of measurement error.

[0005] In a first aspect, this utility model provides a pressure sensor, comprising:

[0006] The body contains a pressure-sensitive element and is adapted to be disposed within the gap of a roller assembly, the roller assembly including a first roller and a second roller, with a gap between the first roller and the second roller. Two sides of the body are in contact with the roller surfaces of the first roller and the second roller, respectively. In a test state, the pressure-sensitive element senses a first pressure at a first position of the roller assembly and / or a second pressure at a second position of the roller assembly.

[0007] The main body contacts the roller surfaces of the first and second rollers on both sides respectively, forming line contact with each roller surface. During testing, pressure-sensitive elements sense the first pressure at the first position of the roller assembly and the second pressure at the second position. This allows on-site personnel to determine whether the pressures (generated by the first and second rollers) at the first and second positions of the roller assembly are the same, ensuring the accuracy of the pressure difference. This, in turn, determines whether the pressures between the first and second roller surfaces are the same, avoiding uneven foil thickness due to unequal pressure. It should be noted that in this embodiment, the first position is one end of the roller assembly, and the second position is the other end.

[0008] In one optional embodiment, the pressure-sensitive element includes a pressure contact portion and an elastic deformation portion, wherein the pressure contact portion is fixedly disposed on a first surface of the elastic deformation portion.

[0009] In one optional embodiment, the cross-section of the elastic deformation portion is a "U" shape with an opening, and a second surface is provided inside the opening of the elastic deformation portion, on which a strain gauge is attached.

[0010] In one optional embodiment, the strain gauge includes a first arc-shaped sensitive grid, the first arc-shaped sensitive grid including a first arc-shaped strain resistor portion and a second arc-shaped strain resistor portion, the first arc-shaped strain resistor portion and the second arc-shaped strain resistor portion are connected and disposed, and the center point of the first arc-shaped strain resistor portion and the center point of the second arc-shaped strain resistor portion coincide.

[0011] In one optional embodiment, one end of the first arc-shaped strain resistor is provided with a first input terminal, the other end of the first arc-shaped strain resistor is provided with a first output terminal, the first output terminal is provided at one end of the second arc-shaped strain resistor, and the other end of the second arc-shaped strain resistor is provided with a second input terminal.

[0012] In one alternative embodiment, the strain gauge further includes a diaphragm having a first arc-shaped sensing grid.

[0013] In one optional embodiment, the body includes a first cover plate and a second cover plate disposed therebetween, the pressure-sensitive element being accommodated between the first cover plate and the second cover plate, the first cover plate being connected to the pressure contact portion and the second cover plate being connected to the elastic deformation portion, or the second cover plate being connected to the pressure contact portion and the first cover plate being connected to the elastic deformation portion.

[0014] In one optional embodiment, the body further includes a guide fastener and a fixing member, the guide fastener being used to fix the first cover plate and the second cover plate together, the second cover plate having a fixing hole on its side, the fixing member being inserted into the fixing hole, and the end of the fixing member being fitted against the side of the guide fastener.

[0015] Secondly, this utility model also provides a pressure measurement system, including the pressure sensor described above.

[0016] In one optional implementation, the system further includes a power source, a differential operational amplifier, a conversion chip, a microcontroller, and a display. The power source provides voltage to the strain gauge, the differential operational amplifier is connected to the strain gauge circuitry, the conversion chip is connected to both the differential operational amplifier and the microcontroller circuitry, and the display is connected to the microcontroller circuitry.

[0017] The pressure sensor and pressure measurement system provided by this utility model have the following advantages: (1) The pressure sensor measures the pressure at at least two different locations to ensure the accuracy of the measured value. By observing whether the pressure difference is within the error range, observe whether the spacing at different locations of the gap of the roller assembly is the same (only when the gap spacing is the same can the pressure be the same); (2) By setting the straight segment and the arc segment, the arc strain resistor part occupies as much space as possible on the annular diaphragm to sense the pressure at each location of the diaphragm as much as possible; (3) Four pressure sensors are set in the body, and the principle of three points determining a plane is used to facilitate the measurement of the pressure between the first roller and the second roller; (4) The guide fastener is used to fix the cover plate. The guide fastener is fixed on the side by the fastener to prevent the guide fastener from moving arbitrarily. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a pressure sensor according to an embodiment of the present invention;

[0020] Figure 2 This is a front view of the pressure sensor according to an embodiment of the present invention;

[0021] Figure 3 for Figure 2 A sectional view along the AA direction;

[0022] Figure 4 for Figure 2 A magnified view of direction B;

[0023] Figure 5 This is a schematic diagram of the roller assembly and pressure sensor in cooperation according to an embodiment of the present invention;

[0024] Figure 6 This is a side view of the pressure sensor in conjunction with an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram showing the cooperation between the second cover plate and the pressure-sensitive element in an embodiment of the present invention;

[0026] Figure 8 This is a front view of the pressure-sensitive element according to an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of a strain gauge according to an embodiment of the present invention;

[0028] Figure 10 for Figure 9 A schematic diagram of resistor connections;

[0029] Figure 11 This is a schematic diagram of a connection circuit for a pressure measurement system according to an embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of another connection circuit for the pressure measurement system according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Body; 101. First cover plate; 102. Second cover plate; 103. Fastener; 104. Fixing hole; 105. Handle; 106. Fixing element; 107. First surface; 108. Second surface; 2. Pressure-sensitive element; 201. Pressure contact part; 202. Elastic deformation part; 2021. First surface; 2022. Second surface; 3. Roller assembly; 301. First roller; 302. Second roller; 4. Strain gauge; 401. Diaphragm; 402. First arc-shaped sensing grid; 4021. First input terminal; 4022. First output terminal; 4023. Second input terminal; 4024. First arc-shaped strain gauge part; 4 0241, First straight segment; 40242, First arc segment; 40243, Second straight segment; 40244, Second arc segment; 4025, Second arc-shaped strain gauge section; 403, Second arc-shaped sensitive grid; 4031, Third input terminal; 4032, Second output terminal; 4033, Fourth input terminal; 4034, Third arc-shaped strain gauge section; 4035, Fourth arc-shaped strain gauge section; 40351, Seventh straight segment; 40352, Seventh arc segment; 40353, Eighth straight segment; 40354, Eighth arc segment; 5, Power source; 6, Electronic selection switch; 7, Operational amplifier; 8, Conversion chip; 9, Microcontroller; 10, Display. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Example 1

[0034] The following is combined Figures 1 to 11 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, a pressure sensor is provided, comprising: a body 1, wherein a pressure-sensitive element 2 is disposed within the body 1, the body 1 being adapted to be disposed within the gap of a roller assembly 3, the roller assembly 3 including a first roller 301 and a second roller 302, wherein a gap is left between the first roller 301 and the second roller 302, and both sides of the body 1 respectively contact the roller surface of the first roller 301 and the roller surface of the second roller 302. In a test state, the pressure-sensitive element 2 senses a first pressure at a first position of the roller assembly 3 and a second pressure at a second position of the roller assembly 3.

[0036] The main body 1 contacts the roller surfaces of the first roller 301 and the second roller 302 on both sides respectively, forming line contact with the roller surfaces. In the test state, the pressure-sensitive element 2 senses the first pressure at the first position of the roller assembly 3 and the second pressure at the second position of the roller assembly 3. This facilitates on-site personnel in determining whether the pressures (formed by the first roller 301 and the second roller 302) between the first and second positions of the roller assembly 3 are the same, ensuring the accuracy of the pressure difference. This allows for the determination of whether the pressures between the first and second roller surfaces are the same, avoiding uneven thickness of the foil material passing through the gap due to unequal pressure. It should be noted that in this embodiment, the first position is one end of the roller assembly 3, and the second position is the other end of the roller assembly 3; the two sides of the main body 1 refer to the two surfaces of the main body, namely, the first surface 107 and the second surface 108.

[0037] In one embodiment, such as Figure 8 As shown, the pressure-sensitive element 2 includes a pressure contact portion 201 and an elastic deformation portion 202. The pressure contact portion 201 is fixedly disposed on the first surface 2021 of the elastic deformation portion 202. The pressure inside the body 1 is sensed by the pressure contact portion 201, and the pressure is transmitted to the elastic deformation portion 202, causing deformation of the elastic deformation portion 202.

[0038] In one embodiment, such as Figure 8 As shown, the cross-section of the elastic deformation section 202 is a "U" shape with an opening. A second surface 2022 is provided inside the opening of the elastic deformation section 202, and a strain gauge 4 is attached to the second surface 2022. By attaching the strain gauge 4 to the second surface 2022, the deformation of the elastic deformation section 202 is transferred to the strain gauge 4.

[0039] In one embodiment, such as Figure 9 As shown, the strain gauge 4 includes a first arc-shaped sensitive grid 402, which includes a first arc-shaped strain resistance section 4024 and a second arc-shaped strain resistance section 4025. The first arc-shaped strain resistance section 4024 and the second arc-shaped strain resistance section 4025 are connected and arranged together. The center point of the first arc-shaped strain resistance section 4024 and the center point of the second arc-shaped strain resistance section 4025 coincide, so as to form two different strain resistance sections that bear strain in different directions. It should be noted that the first arc-shaped strain resistance section 4024 bears tangential positive strain, and the second arc-shaped strain resistance section 4025 bears radial negative strain.

[0040] It is important to note that, such as Figure 9As shown, the first arc-shaped strain gauge section 4024 is composed of several first arc-shaped segments 40242, several second arc-shaped segments 40244, several first straight segments 40241, and several second straight segments 40243, arranged in the pattern of "first straight segment 40241 → first arc-shaped segment 40242 → second straight segment 40243 → second arc-shaped segment 40244 → first straight segment 40241 → first arc-shaped segment 40242 → second straight segment 40243 → second arc-shaped segment 40244 → first straight segment 40244". The first arc-shaped strain gauge section 4024 is formed by connecting segments 40241…; the second arc-shaped strain gauge section 4025 is composed of several third arc segments, several fourth arc segments, several third straight segments and several fourth straight segments, and is formed by connecting segments “third straight segment → third arc segment → fourth straight segment → fourth arc segment → third straight segment → third arc segment → fourth straight segment → fourth arc segment → third straight segment → third arc segment → fourth straight segment → third arc segment → third straight segment…”, thus forming the second arc-shaped strain gauge section 4025.

[0041] In one embodiment, such as Figure 9 As shown, one end of the first arc-shaped strain resistor 4024 is provided with a first input terminal 4021, and the other end of the first arc-shaped strain resistor 4024 is provided with a first output terminal 4022. The first output terminal 4022 is provided at one end of the second arc-shaped strain resistor 4025, and the other end of the second arc-shaped strain resistor 4025 is provided with a second input terminal 4023, so as to form two resistors connected in series.

[0042] In this embodiment, as Figure 9 As shown, strain gauge 4 includes a third arc-shaped sensitive grid, and a fourth arc-shaped sensitive grid includes a third arc-shaped strain resistance section 4034 and a fourth arc-shaped strain resistance section 4035. The third arc-shaped strain resistance section 4034 and the fourth arc-shaped strain resistance section 4035 are connected and arranged. The center point of the third arc-shaped strain resistance section 4034 and the center point of the fourth arc-shaped strain resistance section 4035 coincide, so as to form two different strain resistance sections that bear strain in different directions. It should be noted that the third arc-shaped strain resistance section 4034 bears tangential positive strain, and the fourth arc-shaped strain resistance section 4035 bears radial negative strain.

[0043] It is important to note that, such as Figure 9As shown, the third arc-shaped strain gauge section 4034 is composed of several fifth arc-shaped segments, several sixth arc-shaped segments, several fifth straight segments, and several sixth straight segments, connected by "fifth straight segment → fifth arc-shaped segment → sixth straight segment → sixth arc-shaped segment → fifth straight segment → fifth arc-shaped segment → sixth straight segment → sixth arc-shaped segment → fifth straight segment → fifth arc-shaped segment → sixth straight segment → sixth arc-shaped segment → fifth straight segment..." to form the third arc-shaped strain gauge section 4034; the fourth arc-shaped strain gauge section 4035 is composed of several seventh arc-shaped segments 40352, several... It consists of an eighth arc-shaped segment 40354, several seventh straight segments 40351, and several eighth straight segments 40353. It is formed by connecting “seventh straight segment 40351 → seventh arc-shaped segment 40352 → eighth straight segment 40353 → eighth arc-shaped segment 40354 → seventh straight segment 40351 → seventh arc-shaped segment 40352 → eighth straight segment 40353 → eighth arc-shaped segment 40354 → seventh straight segment 40351…”, thereby forming a fourth arc-shaped strain gauge section 4035.

[0044] In one embodiment, such as Figure 9 As shown, one end of the third arc-shaped strain gauge section 4034 is provided with a third input terminal 4031, and the other end of the third arc-shaped strain gauge section 4034 is provided with a second output terminal 4032. The second output terminal 4032 is provided at one end of the fourth arc-shaped strain gauge section 4035, and the other end of the fourth arc-shaped strain gauge section 4035 is provided with a fourth input terminal 4033, so as to form two resistors connected in series. Furthermore, as... Figure 10 As shown, a Wheatstone bridge is formed by the first arc-shaped strain gauge section 4024, the second arc-shaped strain gauge section 4025, the third arc-shaped strain gauge section 4034, and the fourth arc-shaped strain gauge section 4035, which can both increase sensitivity and provide temperature compensation. Figure 10 As shown, when a stable driving voltage is applied between the first input terminal 4021, the second input terminal 4023 and the third input terminal 4031, the fourth input terminal 4033 of the Wheatstone bridge input terminal, the voltage difference signal between the first output terminal 4022 and the second output terminal 4032 of the Wheatstone bridge output signal electrode can be amplified by the differential operational amplifier 7, and the amplified analog voltage signal is sent to the conversion chip 8 for digital sampling.

[0045] In one embodiment, such as Figure 8 , Figure 9As shown, the strain gauge 4 also includes a diaphragm 401. The diaphragm 401 is provided with a first arc-shaped sensitive grid 402 and a second arc-shaped sensitive grid 403. The diaphragm 401 is annular. The first arc-shaped strain resistance section 4024, the second arc-shaped strain resistance section 4025, the third arc-shaped strain resistance section 4034, and the fourth arc-shaped strain resistance section 4035 are all fan-shaped and symmetrically arranged with the center point of the diaphragm 401 (the center of the annulus) as the center. The first arc-shaped strain resistance section 4024 and the third arc-shaped strain resistance section 4034 are identical, and the second arc-shaped strain resistance section 4025 and the fourth arc-shaped strain resistance section 4035 are identical. By setting the straight segments and arc-shaped segments, the arc-shaped strain resistance sections occupy as much space as possible on the annular diaphragm 401.

[0046] In actual use, when the pressure contact part 201 is subjected to a vertical pressure of magnitude P, the radial strain ε on the surface of the strain gauge 4 (the surface where the strain gauge 4 is attached to the second surface 2022) will increase. r and tangential strain ε t for:

[0047]

[0048] Where: R - radius of the working part of the flat diaphragm 401; h - thickness of the flat diaphragm 401; E - elastic modulus of the diaphragm 401; μ - Poisson's ratio of the diaphragm 401 material; X - radial distance of any point from the center of the circle.

[0049] At the center of diaphragm 401, i.e., at x = 0, ε r and ε t All reach their maximum positive values, that is:

[0050]

[0051] At the edge of diaphragm 401, i.e., at x = R, ε t =0, ε r The minimum value is reached, that is, the maximum negative value is:

[0052]

[0053] exist At, ε r =0.

[0054] In one embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the main body 1 includes a first cover plate 101 and a second cover plate 102 correspondingly arranged. A pressure-sensitive element 2 is accommodated between the first cover plate 101 and the second cover plate 102. The first cover plate 101 is connected to a pressure contact portion 201, and the second cover plate 102 is connected to an elastic deformation portion 202. By providing the pressure-sensitive element 2 between the first cover plate 101 and the second cover plate 102, the pressure between the roller pair 3 borne by the first cover plate 101 and the second cover plate 102 is transmitted to the pressure-sensitive element 2. Figure 3 , Figure 7 As shown, the thickness of the second cover plate 102 is greater than that of the first cover plate 101. The second cover plate 102 has a groove that accommodates the elastic deformation portion 202 of the pressure-sensitive element 2. The groove prevents the pressure-sensitive element 2 from shifting or swaying. Specifically, both the elastic deformation portion 202 and the pressure contact portion 201 are annular. It should be noted that... Figure 7 As shown, the first cover plate 101 and the second cover plate 102 are rectangles with the same area. The second cover plate 102 has four grooves, and each groove contains a pressure-sensitive element 2.

[0055] In one embodiment, such as Figure 2 , Figure 3 and Figure 4 As shown, the main body 1 also includes a guide fastener 103 and a fixing member 106. The guide fastener 103 fixes the first cover plate 101 and the second cover plate 102 together. The second cover plate 102 has a fixing hole 104 on its side, and the fixing member 106 passes through the fixing hole 104. The end of the fixing member 106 is fitted against the side of the guide fastener 103. The guide fastener 103 is used to fix the cover plates together, and the fixing member 106 fixes the side of the guide fastener 103 to prevent arbitrary movement of the guide fastener 103. It should be noted that, as... Figure 3 As shown, the two ends of the guide fastener 103 are located inside the first cover plate 101 and the second cover plate 102, respectively, to prevent the surface of the roller from contacting the guide fastener 103. The fixing block is located on the side of the second cover plate 102. Figure 1 As shown, it also includes a handle 105, which is located on the side of the second cover plate 102. The handle 105 is fixedly connected to the second cover plate 102. The handle 105 drives the overall movement of the body 1, making it easier for on-site personnel to operate and safer.

[0056] A pressure measurement system includes the aforementioned pressure sensor, and further includes a power source 5, an electronic selection switch 6, a differential operational amplifier 7, a conversion chip 8, a microcontroller 9, and a display 10. The power source 5 provides voltage to the strain gauge 4. The electronic selection switch 6 is connected to the strain gauge 4 and the differential operational amplifier 7 respectively. The conversion chip 8 is connected to the differential operational amplifier 7 and the microcontroller 9 respectively. The display 10 is connected to the microcontroller 9. Specifically, the power source 5 provides voltage to the Wheatstone bridge.

[0057] A method of using a pressure measurement system, such as Figure 11 As shown, the input terminals of n Wheatstone bridges are short-circuited and share a single power source 5 (Ui). The output terminals (Uo1, Uo2, Uo3, ..., Uon) are sequentially connected to the input terminals of 1*n electronic selector switches 6. The output terminals of the electronic selector switches 6 are connected to the differential operational amplifier 7 and the conversion chip 8 for sampling. The sampling results are transmitted to the microcontroller 9 for calculation and displayed on the screen.

[0058] Example 2

[0059] The pressure sensor in this embodiment is the same as that in embodiment 1. The pressure measurement system includes a differential operational amplifier 7, a conversion chip 8, a microcontroller 9, and a display 10. The power source 5 provides voltage to the strain gauge 4. The differential operational amplifier 7 is connected to the strain gauge 4. The conversion chip 8 is connected to the differential operational amplifier 7 and the microcontroller 9 respectively. The display 10 is connected to the microcontroller 9.

[0060] A method of using a pressure measurement system, such as Figure 12 As shown, the input terminals of n Wheatstone bridges are short-circuited and share a single power source 5 (Ui), while the output terminals (Uo) are short-circuited and connected in parallel to the differential operational amplifier 7 and the conversion chip 8 for sampling. The sampling results are transmitted to the microcontroller 9 for calculation and displayed on the screen.

[0061] As an alternative implementation, the second cover plate 102 is connected to the pressure contact portion 201, and the first cover plate 101 is connected to the elastic deformation portion 202.

[0062] As an alternative implementation, the number of grooves in the second cover plate 102 may be three, five or even more, with a pressure-sensitive element 2 placed in each groove.

[0063] As an alternative implementation, the first cover plate 101 and the second cover plate 102 may also be other shapes such as circles or triangles.

[0064] As an alternative implementation, the pressure-sensitive element 2 senses a first pressure at a first position of the roller assembly on the 3, or the pressure-sensitive element 2 senses a second pressure at a second position of the roller assembly on the 3, so as to measure a preset position in the test state and determine whether the pressure is the same as the previously measured pressure.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pressure sensor, characterized by The utility model relates to a pressure sensor, comprising: A body (1) is provided with a pressure sensitive element (2) in the body (1), the body (1) is suitable for being arranged in the slit of roller shaft group (3), the roller shaft group (3) includes first roller shaft (301) and second roller shaft (302), the slit is left between first roller shaft (301) and second roller shaft (302), the two sides of body (1) are in contact with the roll surface of first roller shaft (301) and the roll surface of second roller shaft (302) respectively, in the test state, the pressure sensitive element (2) senses the first pressure of the first position of roller shaft group (3), and / or the pressure sensitive element (2) senses the second pressure of the second position of roller shaft group (3).

2. The pressure sensor of claim 1, wherein, The pressure sensitive element (2) includes a pressure contact part (201) and an elastic deformation part (202), and the pressure contact part (201) is fixedly arranged on a first surface (2021) of the elastic deformation part (202).

3. The pressure sensor of claim 2, wherein, The elastic deformation part (202) has a "U" shape with an opening, and a second surface (2022) is arranged in the opening of the elastic deformation part (202), and a strain gauge (4) is attached to the second surface (2022).

4. The pressure sensor of claim 3, wherein, The strain gauge (4) includes a first arc-shaped sensitive grid (402), the first arc-shaped sensitive grid (402) includes a first arc-shaped strain resistance part (4024) and a second arc-shaped strain resistance part (4025), the first arc-shaped strain resistance part (4024) and the second arc-shaped strain resistance part (4025) are connected, and the center points of the first arc-shaped strain resistance part (4024) and the second arc-shaped strain resistance part (4025) are arranged to coincide.

5. The pressure sensor of claim 4, wherein, One end of the first arc-shaped strain resistance part (4024) is provided with a first input end (4021), the other end of the first arc-shaped strain resistance part (4024) is provided with a first output end (4022), the first output end (4022) is arranged at one end of the second arc-shaped strain resistance part (4025), and the other end of the second arc-shaped strain resistance part (4025) is provided with a second input end (4023).

6. The pressure sensor of claim 3, wherein, The strain gauge (4) further includes a diaphragm (401), and the diaphragm (401) is provided with the first arc-shaped sensitive grid (402).

7. The pressure sensor of claim 3, wherein, The body (1) includes a first cover plate (101) and a second cover plate (102) arranged correspondingly, the pressure sensitive element (2) is accommodated between the first cover plate (101) and the second cover plate (102), the first cover plate (101) is connected with the pressure contact part (201), the second cover plate (102) is connected with the elastic deformation part (202), or the second cover plate (102) is connected with the pressure contact part (201), and the first cover plate (101) is connected with the elastic deformation part (202).

8. The pressure sensor of claim 7, wherein, The body (1) further comprises a guide fastener (103) and a fixing member (106), the guide fastener (103) is used to fixedly connect the first cover plate (101) and the second cover plate (102), the side surface of the second cover plate (102) is provided with a fixing hole (104), the fixing member (106) is arranged in the fixing hole (104), and the end of the fixing member (106) is arranged in abutment with the side surface of the guide fastener (103).

9. A pressure measurement system, characterized by A pressure sensor according to any one of claims 1-8.

10. The pressure measurement system of claim 9, wherein, Further comprising a power source (5), a differential operational amplifier (7), a conversion chip (8), a single-chip microcomputer (9) and a display (10), the power source (5) provides voltage for the strain gauge (4) pasted on the pressure sensitive element (2), the differential operational amplifier (7) is connected with the strain gauge (4) in circuit, the conversion chip (8) is connected with the differential operational amplifier (7) and the single-chip microcomputer (9) in circuit respectively, and the display (10) is connected with the single-chip microcomputer (9) in circuit.

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