Pressure sensor

Abstract

The utility model provides a pressure sensor, which comprises a pressure probe upper cover, a compression-resistant spring and a pressure probe base, the compression-resistant spring is arranged between the pressure probe upper cover and the pressure probe base, the compression-resistant spring is sleeved outside the pressure probe base, a central tube is arranged in the middle of the pressure probe base, and the central tube is sleeved outside the pressure probe base. The pressure probe upper cover is provided with a pressure measuring probe located in the central pipe, a coil is installed in the central pipe, and the tail end of the pressure measuring probe is provided with a contact matched with the coil. According to the utility model, the contact, the coil and the pressure probe are integrated together, the change of a voltage signal is caused by the change of a resistance value, the pressure measurement of a powder material is further realized, the circuit design can be simplified, and external connection and components are reduced, so that the risk in the operation and maintenance process is reduced, and the overall safety is improved; the device has the characteristics of good stability, high reliability, good durability, simple structure and low cost.

Description

Technical Field

[0001] The utility model relates to a pressure sensor, in particular to a device for measuring the stable or quasi-stable pressure of flowing solid materials. Background Art

[0002] The analysis of the stress of powder materials belongs to the category of bulk mechanics. Janssen gave the mechanical relationship of bulk materials in 1895, and this formula has become the basis for the current research on bulk materials. Some Chinese scholars have improved the basic theory of the most popular discrete element method based on the summary of the advantages and disadvantages of bulk mechanics research methods. Through simulation, they found that the pressure distribution at the bottom of the silo is uneven. Scholar Professor Feng Yuntian directly gave the formula for the derivation of horizontal pressure:

[0003]

[0004] Among them, γ is the weight of the stored material, μ is the friction coefficient between the stored material and the silo wall, R is the equivalent radius of the silo, H is the height of the material surface from the storage surface to the pressure measurement point, k is the conversion coefficient, P H is the pressure value.

[0005] By using the above theory, when the bottom pressure is known, the height of the stored material at the calculation point can be calculated in reverse, so as to design the powder material silo structure and the powder material grabbing equipment. Therefore, it is very necessary and urgent to invent a pressure sensor suitable for powder materials.

[0006] However, as a typical bulk granular material, the pressure at the bottom of the powder silo is affected by factors such as the friction of the silo wall and the internal friction of the powder material. It has continuous medium characteristics different from solids and liquids. Therefore, the sensors used for powder material pressure testing have high requirements for sealing, durability and stability. Existing pressure sensors are mainly used for geotechnical engineering testing and are more inclined to qualitative monitoring. Due to their limitations in stability, consistency and reliability, they are not suitable for pressure measurement of powder materials. Summary of the invention

[0007] The purpose of the utility model is to provide a pressure sensor to measure the pressure of powder materials in view of the above-mentioned deficiencies in the prior art.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0009] A pressure sensor comprises a pressure probe upper cover, a pressure-resistant spring and a pressure probe base, wherein a pressure-resistant spring is arranged between the pressure probe upper cover and the pressure probe base, the pressure-resistant spring is sleeved on the outside of the pressure probe base, a central tube is arranged in the middle of the pressure probe base, the pressure probe upper cover is provided with a pressure measuring probe located in the central tube, a coil is installed in the central tube, and a contact matching the coil is arranged at the end of the pressure measuring probe.

[0010] The utility model can simplify circuit design and reduce external connections and components by integrating the contact and the pressure probe, thereby reducing risks during operation and maintenance and improving overall safety.

[0011] Furthermore, a metal cover is provided above the upper cover of the pressure probe.

[0012] Furthermore, the metal cover is covered with a wear-resistant rubber pad.

[0013] Furthermore, the signal line of the pressure measuring probe is connected to the measuring instrument through a metal tube.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The utility model integrates the contact, coil and pressure probe together, causes the voltage signal to change through the change of resistance value, and then realizes the pressure measurement of powder material. At the same time, it can also simplify the circuit design, reduce external connections and components, thereby reducing the risks in the operation and maintenance process and improving the overall safety. It has the characteristics of good stability, high reliability, good durability, simple structure and low cost.

[0016] (2) The utility model is provided with a metal cover to protect the mechanical structure of the probe and make it evenly stressed, while preventing sharp stones mixed in the powder from damaging the equipment; at the same time, a wear-resistant rubber pad is provided to ensure that the powder material will not enter the groove through the gap between the groove and the metal cover 14 and affect the normal operation of the device.

[0017] (3) The utility model is provided with a measuring instrument for monitoring and controlling the working state of the pressure sensor to ensure the safety of the line, while at the same time reserving space for the modification of the pressure sensing line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the pressure sensor according to an embodiment of the utility model;

[0019] In the above drawings: 1- silo bottom; 2- wear-resistant rubber pad; 3- metal cover; 4- pressure probe cover; 5- compression spring; 6- pressure probe base; 7- sliding rheostat coil; 8- sliding rheostat contact; 9- current signal input; 10- current signal output. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1 As shown, this embodiment provides a pressure sensor suitable for powder material silos, including a pressure probe cover 4, a pressure spring 5, and a pressure probe base 6. A pressure spring 5 is provided between the pressure probe cover 4 and the pressure probe base 6. The pressure spring 5 is sleeved outside the pressure probe base 6. A central tube is provided in the middle of the pressure probe base 6. The pressure probe cover 4 is provided with a pressure measuring probe located in the central tube. A sliding rheostat coil 7 is installed in the central tube. A sliding rheostat contact 8 matching the sliding rheostat coil 7 is provided at the end of the pressure measuring probe. With the above device, the pressure signal can be converted into a displacement signal, and then converted into an electrical signal through the sliding rheostat to achieve pressure measurement.

[0022] In this embodiment, the sliding rheostat current signal input 9 is connected by the sliding rheostat contact 8, and the current signal output 10 is led out from the lower end of the sliding rheostat coil 7. By integrating the sliding rheostat with the pressure probe, the circuit design can be simplified, and external connections and components can be reduced, thereby reducing the risks in the operation and maintenance process and improving the overall safety.

[0023] In this embodiment, the pressure probe base 6 is fixed in a groove of the silo bottom 1 by bolts.

[0024] Specifically, a metal cover 3 is provided above the upper cover 4 of the pressure probe to protect the mechanical structure of the probe and make it evenly stressed, while preventing sharp stones mixed in the powder from damaging the equipment, thus playing a protective role.

[0025] Specifically, the metal cover 3 is covered with a wear-resistant rubber pad 2 to ensure that the powder material will not enter the groove through the gap between the groove and the metal cover 14 and affect the normal operation of the device.

[0026] Specifically, the pressure measurement probe signal line is connected to the measuring instrument through a pre-buried metal pipe, which is used to monitor and control the working status of the pressure sensor to ensure the safety of the line, while reserving space for the modification of the pressure sensor line.

[0027] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all belong to the protection scope of the utility model.

[0028] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A pressure sensor, characterized in that: The invention comprises a pressure probe upper cover (4), a pressure-resistant spring (5), and a pressure probe base (6); a pressure-resistant spring (5) is arranged between the pressure probe upper cover (4) and the pressure probe base (6); the pressure-resistant spring (5) is sleeved on the outside of the pressure probe base (6); a central tube is provided in the middle of the pressure probe base (6); the pressure probe upper cover (4) is provided with a pressure measuring probe located in the central tube; a coil (7) is installed in the central tube; and a contact (8) matching with the coil (7) is provided at the end of the pressure measuring probe.

2. The pressure sensor according to claim 1, characterized in that: A metal cover (3) is arranged above the pressure probe upper cover (4).

3. The pressure sensor according to claim 2, characterized in that: The metal cover (3) is covered with a wear-resistant rubber pad (2).

4. The pressure sensor according to claim 1, characterized in that: The signal line of the pressure measuring probe is connected to the measuring instrument through a metal tube.

Images