Integrated mining pressure sensor

Abstract

The utility model discloses an integrated mining pressure sensor, which comprises a semi-cylinder-shaped core body, the side wall of the core body is connected with a strain gauge, and the core body is used for generating strain under the impact action of pressure oil flowing into the core body. And the first connecting part is arranged at the end part of the core body, one end of the first connecting part is integrally connected with the bottom surface of the core body, and the first connecting part is connected with the rear-end explosion-proof shell. And the second connecting part is arranged at the other end of the first connecting part, is integrally connected with the first connecting part, and is connected with an interface part of mining equipment. The pressure guide hole is formed in the second connecting part and extends into the core body from the second connecting part through the second connecting part, and pressure oil is introduced into the pressure guide hole to impact the interior of the core body. The sensor formed by integrally connecting the first connecting part, the second connecting part and the core body has high form and location tolerance precision in structure, gets rid of limitation of an O-shaped ring, can be used for a long time, and has the advantages of high overload, high safety coefficient, improved reliability and safety, high oil stain resistance, corrosion resistance and high precision.

Description

Technical Field

[0001] This utility model relates to the field of mining pressure sensor technology, and in particular to an integrated mining pressure sensor. Background Technology

[0002] A mining pressure sensor is a pressure measurement device specifically designed for underground mining environments such as mines. Mining pressure sensors are primarily used for safety management in underground mining environments such as coal mines and metal mines. They can accurately measure changes in the pressure of gases or liquids underground, providing crucial data support for mine safety management.

[0003] Currently, diffused silicon or silicon microcapacitor cores are commonly used in the market, with a small number of strain gauge cores. The strain gauge core involves mounting the sensing element within a base, with an explosion-proof housing at the rear. An internal circuit board processes the sensor's signal. The base interface and the mining equipment interface use common quick-connect KJ10 or DN10 connectors to detect whether the pressure in the mining equipment's oil lines is within safe thresholds. Currently, because the core is mounted within the base, the oil pressure from the pipeline acts on the sensing surface of the core through the pressure tap in the base. The core and base are sealed with O-rings to prevent oil pressure leakage. One side of the O-ring is in constant contact with high-pressure hydraulic oil; therefore, the lifespan of the entire pressure sensor is limited by the lifespan of the O-ring. Furthermore, the quality of O-rings on the market varies greatly, resulting in a consistently limited lifespan. Additionally, the oil pressure lines in mining equipment experience complex conditions such as impacts and overloads. As the core component of the sensor, the sensing diaphragm of the diffused silicon core is relatively thin and is likely to be punctured under overload conditions. Despite being designed to withstand up to 1.5 times the overload, certain potential risks still exist, and the service life is significantly affected.

[0004] Therefore, pressure sensors have a relatively short service life due to the quality of the O-ring and the thinness of the sensing diaphragm in the core. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an integrated mining pressure sensor, which senses the pressure of the medium oil in the mining equipment by having pressure oil enter the integrated structure consisting of the core, the first connecting part and the second connecting part through the pressure inlet.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An integrated mining pressure sensor includes:

[0008] The core is semi-cylindrical in shape, with its sidewalls connected to the strain gauge, and is used to generate strain under the impact of the internal pressurized oil.

[0009] The first connecting part is located at the end of the core, with one end integrally connected to the bottom surface of the core and connected to the rear explosion-proof shell.

[0010] The second connecting part is located at the other end of the first connecting part and is integrally connected with the first connecting part, serving as an interface component with the mining equipment.

[0011] The pressure inlet is opened on the second connecting part and extends from the second connecting part into the core body, through which pressurized oil is introduced to impact the inside of the core body.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The sensor, integrally formed by the first connecting part, the second connecting part, and the core, introduces pressurized oil into the core through a pressure inlet. The impact force of the pressurized oil is sensed at the end where the pressure inlet connects to the core, causing strain in the core. A pressure signal is then transmitted through a strain gauge. This structure offers high dimensional and positional tolerance accuracy, eliminates the limitations of O-rings, and allows for long-term sensor use. Simultaneously, the core features high overload capacity, a high safety factor, and improved reliability and safety. Furthermore, it offers advantages such as high resistance to oil contamination, corrosion, and high precision.

[0014] A further preferred embodiment is that the core is a solid body, comprising:

[0015] The curved wall is one side wall of the core, located on the top surface of the first connecting part, and integrally connected with the first connecting part.

[0016] The straight wall is the other side wall of the core, integrally connected to the top surface of the first connection part, located on the same side as the curved wall, and its two side edges are integrally connected to the two side edges of the curved wall respectively. The wall surface is fixedly connected to the strain gauge.

[0017] The top wall, which is curved, is located at the top of the curved wall. Its edges are integrally connected to the top edge of the curved wall and the top edge of the straight wall, respectively. The wall surface is fixedly connected to the strain gauge.

[0018] Using the above technical solution, the solid core uses a straight wall as the sensing surface to transmit the impact force of the pressure oil to the strain gauge. In addition, the special shape structure formed by the curved wall, straight wall and top wall, and the absence of part of the side wall of the column on the straight wall side, makes the core form a semi-columnar shape, which makes part of the impact force transmitted inside the core disappear. It has the characteristics of high precision and strong impact resistance.

[0019] A further preferred embodiment is that the junction between the straight wall and the top wall is rounded.

[0020] By adopting the above technical solution, the connection between the straight wall and the top wall becomes smoother and the structure becomes more refined.

[0021] A further preferred embodiment is that the curved surface of the top wall is a superior curved surface.

[0022] By adopting the above technical solution, the inferior arc surface is eliminated, which also eliminates the corresponding cylindrical part, reducing the interference of this part on pressure sensing. The impact force of the pressure oil inside the core can be fully transmitted to the core, making its detection accuracy higher.

[0023] Further optimization involves making the pressure inlet a blind hole with a tapered end, which is used to transmit the instantaneous impact force of the contact pressure oil to the core through the tip and the curved surface.

[0024] Using the above technical solution, after the pressurized oil enters the blind hole, the impact force is strongest at the tip of the conical surface, and the strain is most sensitive at this point, which can first transmit the impact force of the pressurized oil to the strain gauge on the straight wall.

[0025] Further optimization involves the core being coaxial with the first connecting part and the second connecting part.

[0026] By adopting the above technical solution, it is ensured that the pressure oil enters the pressure inlet and eventually enters the center of the core.

[0027] Further optimization involves using 17-4PH alloy steel for the core, the first connecting part, and the second connecting part.

[0028] Using the above technical solution, the sensor made of this alloy steel has a safety factor that is 5 times higher than that of conventional pressure sensors. It has high overload and high reliability safety performance, as well as the advantages of impact resistance, high oil resistance and corrosion resistance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0030] Figure 2 This is a schematic diagram of the core structure in this embodiment.

[0031] Figure 3 This is a schematic diagram of the axial cross-section of the structure in this embodiment.

[0032] Figure 4 This is a schematic diagram of the conical surface in this embodiment.

[0033] Reference numerals: 1-core; 11-curved wall; 12-straight wall; 13-top wall; 3-pressure hole; 4-first connecting part; 5-second connecting part. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-3 This utility model will be described in further detail.

[0035] An integrated mining pressure sensor includes:

[0036] Core 1 is semi-cylindrical in shape, with its sidewalls connected to the strain gauge, and is used to generate strain under the impact of the internal pressure oil.

[0037] The first connecting part 4 is located at the end of the core 1, with one end integrally connected to the bottom surface of the core 1 and connected to the rear explosion-proof housing. The rear explosion-proof housing, which requires an instruction manual, is the explosion-proof housing on mining equipment. It is connected to the first connecting part 4 to mount the sensor on the mining equipment. This is existing equipment and does not require further description or structural diagrams.

[0038] The second connecting part 5 is located at the other end of the first connecting part 4 and is integrally connected with the first connecting part 4, serving as an interface component with the mining equipment.

[0039] Pressure hole 3 is opened on the second connecting part 5 and extends from the second connecting part 5 into the core 1, through which pressure oil is introduced to impact the interior of the core 1.

[0040] The sensor, integrally formed by the first connecting part 4, the second connecting part 5, and the core 1, introduces pressurized oil into the core 1 through the pressure inlet 3. The sensor senses the impact force of the pressurized oil at the end where the pressure inlet 3 connects to the interior of the core 1, causing strain in the core 1. A pressure signal is then transmitted through a strain gauge. This structure offers high dimensional and positional tolerance accuracy, eliminates the limitations imposed by O-rings, and allows the sensor to be used for extended periods. Simultaneously, the core 1 features high overload capacity, a high safety factor, and improved reliability and safety. Furthermore, it offers advantages such as high resistance to oil contamination, corrosion resistance, and high precision.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the core 1 is a solid body, comprising:

[0042] The curved wall 11 is a side wall of the core 1, which is set on the top surface of the first connecting part 4 and integrally connected with the first connecting part 4.

[0043] The straight wall 12, which is the other side wall of the core, is integrally connected to the top surface of the first connecting part 4 and is located on the same side as the curved wall 11. Its two side edges are integrally connected to the two side edges of the curved wall 11, and the wall surface is fixedly connected to the strain gauge. The straight wall 12 is the sensing surface, and its wall surface is fixedly connected to the strain gauge to transmit the sensed impact force to the strain gauge. It should be noted that since the connection method between the strain gauge and the sensor is a conventional method, the strain gauge and the connection method are not described in detail.

[0044] The top wall 13 is arc-shaped and is located on the top of the curved wall 11. Its edges are integrally connected to the top edge of the curved wall 11 and the top edge of the straight wall 12, respectively.

[0045] The solid core 1 uses the straight wall 12 as the sensing surface to transmit the impact force of the pressure oil to the strain gauge. In addition, the special shape structure formed by the curved wall 11, the straight wall 12 and the top wall 13, the side wall of the column is omitted on one side of the straight wall 12, so that the core 1 forms a semi-column shape, which makes part of the impact force transmitted inside the core 1 disappear. It has the characteristics of high precision and strong impact resistance.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the connection between the straight wall 12 and the top wall 13 is rounded, making the connection between the straight wall 12 and the top wall 13 smoother and the structure more refined.

[0047] Specifically, such as Figure 2 and Figure 3 As shown, in this embodiment, the arc surface of the top wall 13 is a superior arc surface, eliminating the inferior arc surface and thus eliminating the corresponding column part, reducing the interference of this part on pressure sensing. The impact force of the pressure oil inside the core 1 can be completely transmitted to the core 1, making its detection accuracy higher.

[0048] Specifically, such as Figure 3 As shown, in this embodiment, the pressure inlet 3 is a blind hole with a conical curved end, which is used to transmit the instantaneous impact force of the pressure oil through the tip and curved surface to the core 1.

[0049] After the pressurized oil enters the blind hole, the impact force is strongest at the tip of the conical surface, where the strain is most sensitive and can be transmitted to the strain gauge on the straight wall first.

[0050] Specifically, such as Figure 2 and Figure 3 As shown, in this embodiment, the core 1 is coaxial with the first connecting part 4 and the second connecting part 5, ensuring that the pressure oil enters the pressure inlet 3 and finally enters the center of the core 1.

[0051] Specifically, such as Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, in this embodiment, the core 1, the first connecting part 4 and the second connecting part 5 are all made of 17-4PH alloy steel. The sensor made of this alloy steel has a safety factor that is 5 times higher than that of conventional pressure sensors. It has high overload and high reliability safety performance, as well as the advantages of impact resistance, high oil resistance and corrosion resistance.

[0052] Please combine Figures 1-3 The specific process of pressure detection in this embodiment is described as follows:

[0053] Pressurized oil enters through the inlet of pressure tap 3, flows through the second connecting part 5 and the first connecting part 4 before entering the core 1, and impacts the blind end of pressure tap 3. The conical surface of the blind end, subjected to oil pressure, transmits this pressure to the core 1, causing the surface of the straight wall 12 to bulge. The strain gauge senses the pressure change on the core 1 and outputs it as a pressure electrical signal. Since the entire structure is essentially formed by machining the interface component 5 (connecting the core 1 to the mining equipment) and the first connecting part 4 (connecting to the explosion-proof housing) in one piece, it has high dimensional and positional tolerance accuracy and eliminates the need for O-rings. Therefore, its lifespan is not limited by O-ring usage, allowing for long-term reliable use. Furthermore, the strain gauge itself is designed with 17-4PH alloy steel, providing a 5-fold safety factor and advantages such as high overload capacity, high reliability, impact resistance, high oil resistance, corrosion resistance, and high precision. In actual use, the pressure detection accuracy reaches as high as one ten-thousandth.

[0054] In summary, the integrated structure formed by the core 1, the first connecting part 4, the second connecting part 5, and the pressure-feeding hole 3 has high-precision dimensional and positional tolerances. This structure is not limited by the use of O-rings, extending its service life. The application of 17-4PH alloy steel, with its high overload capacity, high reliability, impact resistance, oil resistance, corrosion resistance, and high precision, allows for long-term application in the oil pressure testing environment of underground mines.

[0055] This specific embodiment is merely an explanation of the utility model and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection of this utility model.

Claims

1. An integrated mining pressure sensor, characterized in that, include: The core (1) is semi-cylindrical, and its sidewall is connected to the strain gauge to generate strain under the impact of the internal pressure oil. The first connecting part (4) is provided at the end of the core (1), one end of which is integrally connected to the bottom surface of the core (1) and connected to the rear explosion-proof shell. The second connecting part (5) is disposed at the other end of the first connecting part (4) and is integrally connected with the first connecting part (4), serving as an interface component with the mining equipment; Pressure hole (3) is opened on the second connecting part (5) and extends from the second connecting part (5) through the second connecting part (5) into the core (1), through which pressure oil is introduced to impact the inside of the core (1).

2. The integrated mining pressure sensor according to claim 1, characterized in that, The core (1) is a solid body, comprising: The curved wall (11) is a side wall of the core (1), which is disposed on the top surface of the first connecting part (4) and integrally connected with the first connecting part (4); The straight wall (12) is the other side wall of the core (1), integrally connected to the top surface of the first connecting part (4), and its two side edges are integrally connected to the two side edges of the curved wall (11), and the wall surface is fixedly connected to the strain gauge. The top wall (13) is arc-shaped and is located on the top of the curved wall (11). Its edges are integrally connected to the top edge of the curved wall (11) and the top edge of the straight wall (12).

3. The integrated mining pressure sensor according to claim 2, characterized in that, The connection between the straight wall (12) and the top wall (13) is rounded.

4. The integrated mining pressure sensor according to claim 2, characterized in that, The arc surface of the top wall (13) is a superior arc surface.

5. The integrated mining pressure sensor according to claim 2, characterized in that, The pressure-guiding hole (3) is a blind hole with a conical curved end, which is used to transmit the instantaneous impact force of the contact pressure oil to the core (1) through the tip and curved surface.

6. The integrated mining pressure sensor according to claim 1, characterized in that, The core (1) is coaxial with the first connecting part (4) and the second connecting part (5).

7. The integrated mining pressure sensor according to claim 1, characterized in that, The core (1), the first connecting part (4) and the second connecting part (5) are all made of 17-4PH alloy steel.

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