Vibration absorption type two-phase capsule piston gravity sensor

Abstract

The invention discloses a damping type two-phase capsule piston gravity sensor. The gravity sensor comprises a guide sleeve assembly, a piston force measuring assembly and an eccentric vibration assembly. The invention belongs to the technical field of dynamic measurement and extreme environment measurement, and solves the problems that an existing strain sensor is poor in overload resistance in the aspect of dynamic force measurement and weighing measurement, and cannot actively eliminate elastic oscillation and external short-frequency shock waves and other measurement technologies. The gravity sensor with the shock absorption function has the advantages of strong shock resistance, large overload, automatic temperature compensation, accurate metering and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of dynamic measurement and extreme environment measurement, and in particular relates to a vibration-absorbing two-phase capsule-separated piston gravity sensor. Background Art

[0002] Resistive strain sensors are currently widely used in the field of weighing. However, with the continuous extension of industrial application scenarios, the static force measurement method through rigid body deformation is no longer applicable to dynamic measurement.

[0003] Rigid measuring elements will experience elastic oscillations when deformed by force. The more sensitive the measuring element, the weaker its ability to resist interference from the external environment. The industrial field environment is restricted by natural conditions and working conditions. There are large temperature differences, strong vibrations and other influencing factors that are not suitable for static measurement. The existing technology lacks the requirements for dynamic measurement. When using static measurement sensors for measurements in dynamic environments, problems such as large fluctuations in measured values, inaccuracy, poor stability and reliability, and a sudden reduction in sensor life will occur. Summary of the invention

[0004] The purpose of the present invention is to provide a vibration-damping two-phase spacer piston gravity sensor, which solves the problems of large measurement value fluctuation, inaccuracy, poor stability and reliability, and a sudden reduction in sensor life when the existing sensors are used for measurement in dynamic environments.

[0005] The present invention adopts the following technical scheme: a vibration-absorbing two-phase spaced capsule piston gravity sensor, which comprises a guide sleeve assembly, a piston force measuring assembly and an eccentric vibration assembly.

[0006] The piston force measuring assembly comprises a piston cylinder, a throttling metering chamber, an air charging nozzle, an air connecting cylinder and a pressure gauge.

[0007] The air connecting cylinder and the pressure gauge are located on both sides of the inflation nozzle, and the throttling metering cavity is fixedly arranged perpendicular to the inflation nozzle.

[0008] The guide sleeve assembly comprises an upper protective sleeve, a lower protective sleeve, a load-bearing plate, a piston rod supporting end cover, a first outer side plate, a second outer side plate and balls.

[0009] The piston cylinder is sleeved in the inner cavities of the upper protective sleeve and the lower protective sleeve, and the piston at the top of the piston cylinder extends out of the upper protective sleeve.

[0010] A groove is arranged on one side of the upper protective sleeve and the lower protective sleeve for connecting the throttling metering cavity; the second outer plate is fixedly arranged on the outer wall of the groove of the upper protective sleeve, and the first outer plate is fixedly arranged on the other three outer walls of the upper protective sleeve.

[0011] The eccentric vibration assembly comprises a motor, an eccentric wheel and a transmission gear; one end of the motor is fixedly connected to the eccentric wheel through the transmission gear, and the other end of the motor is directly fixedly connected to the eccentric wheel.

[0012] The load-bearing plate is fixed on the top of the eccentric vibration assembly.

[0013] Preferably, a smooth convex structure made of hardwood, nylon or polytetrafluoroethylene is fixed on the inner cavities of the upper protective cover and the lower protective cover.

[0014] Preferably, the grooves are evenly arranged on the first outer plate and the second outer plate.

[0015] Preferably, a ball bearing is arranged on the groove.

[0016] Preferably, a ceramic pressure sensor is arranged inside the throttling metering chamber.

[0017] The beneficial effects of the present invention are as follows: the present application utilizes Pascal's law to convert gravity into longitudinal pressure waves through the piston force measuring assembly during measurement, and the two gas-liquid interfaces in the piston cylinder are reflected and refracted and interfere with each other, and the pressure waves are transmitted to the ceramic pressure sensor through the filter cavity and the throttling metering cavity for shock wave elimination processing to measure the pressure and then convert it into gravity value. The measurement method is also applied to weighing. Compared with traditional weighing sensors, this gravity sensor with vibration elimination function has the advantages of strong shock resistance, large overload, automatic temperature compensation, and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the vibration-eliminating two-phase capsule piston gravity sensor of the present application; Figure 2 This is a schematic diagram of the expansion of the vibration-eliminating two-phase capsule piston gravity sensor of the present application; Figure 3 This is a schematic diagram of the structure of the piston force measuring assembly of the present application; Figure 4 It is a schematic diagram of the structure of the eccentric vibration component of this application.

[0019] Among them: 1. Motor; 2. Eccentric wheel; 3. Transmission gear; 4. Load-bearing plate; 5. Piston rod support end cover; 6. First outer plate; 601. Ball row outer plate; 602. Ball row inner cover plate; 7. Second outer plate; 8. Upper protective cover; 9. Piston cylinder; 901. Piston; 10. Lower protective cover; 11. Ball; 12. Throttle metering chamber; 13. Inflating nozzle; 14. Connecting cylinder; 15. Pressure gauge. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0021] The present application provides a vibration-absorbing two-phase spaced capsule piston gravity sensor, which comprises a guide sleeve assembly, a piston force measuring assembly and an eccentric vibration assembly. The guide sleeve assembly can also be called a rectangular needle roller type piston cylinder guide sleeve, which includes an upper protective sleeve 8, a lower protective sleeve 10, a load-bearing plate 4, a piston rod support end cover 5, a first outer plate 6, a second outer plate 7 and a ball 11.

[0022] The upper protective cover 8 and the lower protective cover 10 are made of metal plates, and a smooth convex structure made of hardwood, nylon or polytetrafluoroethylene is fixed on the inner cavity thereof. The outer plate 601 of the ball row and the inner cover plate 602 of the ball row are combined to form the first outer plate 6. The upper protective cover 8 and the lower protective cover 10 have grooves set on the corresponding sides. The second outer plate 7 is provided with grooves corresponding to the upper protective cover 8 and the lower protective cover 10, and the first outer plate 6 is fixedly set on the outer walls of the other three sides of the upper protective cover 8 and the lower protective cover 10, and grooves for placing the balls 11 are evenly set on the first outer plate 6 and the second outer plate 7.

[0023] The piston force measuring assembly includes a piston cylinder 9, a throttling metering chamber 12, an air filling nozzle 13, an air connection cylinder 14 and a pressure gauge 15. The air connection cylinder 14 and the pressure gauge 15 are respectively located on both sides of the air filling nozzle 13, and the throttling metering chamber 12 is fixedly arranged perpendicular to the air filling nozzle 13. A ceramic pressure sensor is arranged inside the throttling metering chamber 12.

[0024] An inflation nozzle 13 is fixedly arranged at the bottom of the metering chamber 12, and a pressure gauge 15 and an air connecting cylinder 14 are respectively arranged on both sides of the inflation nozzle 13. The air connecting cylinder 14 and the throttling metering chamber 12 are arranged in the groove of the second outer plate 7, and the air connecting cylinder 14 moves up and down along the outer wall of the piston cylinder 9.

[0025] The role of the inflation nozzle 13 is to supplement the gas medium in the piston cylinder 9. The piston cylinder 9 is a friction component and is not absolutely sealed. The internal gas will experience pressure loss with frequent use, so it is necessary to use the inflation nozzle 13 to supplement the internal gas medium. The pressure gauge 15 plays a role in indicating the internal pressure of the piston cylinder 9.

[0026] The piston cylinder 9 is placed in the inner cavity of the upper protective sleeve 8 and the lower protective sleeve 10. The piston 901 at the top of the piston cylinder 9 extends out of the upper protective sleeve 8, and its top is movably connected to the bottom surface of the piston rod support end cover 5.

[0027] The eccentric vibration assembly includes a motor 1, an eccentric wheel 2 and a transmission gear 3. One end of the motor 1 is fixedly connected to the eccentric wheel 2 through the transmission gear 3, and the other end of the motor 1 is directly fixedly connected to the eccentric wheel 2. The bottom of the eccentric vibration assembly is arranged on the piston rod support end cover 5.

[0028] The vibration-absorbing two-phase separated capsule piston gravity sensor of the present application is a new type of weighing sensor. In the process of dynamic weighing or force measurement, the vibration generated by the jumping impact and movement is quickly attenuated in the weighing measurement stage, thereby ensuring the stability of the weighing measurement, actively offsetting the distortion of the force measurement signal of the ceramic pressure sensor caused by excessive vibration, and avoiding damage to the ceramic pressure sensor caused by excessive vibration impact energy.

[0029] The working principle of the vibration-eliminating two-phase capsule piston gravity sensor of the present application is as follows: The vibration-damping two-phase spaced capsule piston gravity sensor of the present application comprises a guide sleeve assembly, a piston force measuring assembly and an eccentric vibration assembly. The piston force measuring assembly is a two-phase spaced capsule piston force measuring assembly.

[0030] In use, the shock wave and oscillation wave applied to the ceramic pressure sensor end are actively buffered and filtered. The vibration-absorbing two-phase spacer piston gravity sensor of the present application is a load-bearing shock-absorbing buffer device and an important component of weighing measurement. The piston force measuring component can absorb the impact kinetic energy through the compressed air compression deformation, and use the throttling metering chamber 12 to consume and attenuate the shock wave.

[0031] The operation of the vibration-damping two-phase capsule piston gravity sensor of the present application is divided into two parts: a compression stroke and an extension stroke.

[0032] Compression stroke: When there is a sudden change in gravity, the guide sleeve assembly is compressed, and force is applied to the gas-liquid two-phase medium (two-phase separation bag) in the piston cylinder 9 through the piston. The pressure is converted into a longitudinal pressure wave and passes through two two-phase interfaces and reverses. The gas phase is compressed in the throttling metering chamber 12 and buffered by the throttling metering chamber 12 to reach the ceramic pressure sensor. During this period, heat is generated by friction and dissipated through the first outer plate 6 and the second outer plate 7 of the guide sleeve assembly. This is called the "compression stroke".

[0033] Extension stroke: When the gas phase in the two-phase separation capsule piston force measuring assembly is compressed to the minimum volume and reaches the compression limit, the gas begins to expand as an elastic body, and the two-phase interface generates more interference waves and consumes more shock wave and oscillation wave energy again. The compression stroke and the extension stroke constitute a cycle, during which the eccentric vibration assembly generates a certain frequency of oscillation waves between the bearing plate 4 in the guide sleeve assembly and the piston rod support end cover 5, eliminating the gas elastic oscillation and external oscillation waves with the highest efficiency, and forming dynamic friction on the outer wall of the piston cylinder 9 to avoid the generation of static friction of the piston cylinder 9. Under the buffering effect of the throttling metering chamber 12, the pressure is slowly increased to the ceramic pressure sensor measurement signal.

[0034] The throttling metering cavity 12 uses micropores to connect the ceramic pressure sensor, and the gas passes through the micropores to the ceramic pressure sensor to play a pressure buffering role. However, different chamber volumes and throttling apertures have different sizes, and have different reactions to the filtering of pressure waves and shock waves. The side wall of the throttling metering cavity 12 is connected to the pressure gauge 15 and the U-shaped two-phase filtering structure. In order not to affect the up and down movement of the piston of the piston cylinder 9, the second outer plate 7 is provided with a groove, and the groove is a rectangular structure.

[0035] When pressure is applied to the top of the piston cylinder 9, since the piston cylinder 9 is set with equal cross-sectional areas, according to Pascal's law, p=f / s, f refers to the force applied to the top of the piston cylinder 9, s refers to the cross-sectional area of ​​the piston cylinder 9, and p refers to the external pressure applied to the piston cylinder 9. The pressure is transmitted in all directions, and the longitudinal vertical force will produce a continuous pressure wave in the longitudinal direction.

[0036] The eccentric vibration component is driven by a motor, and the eccentric stroke is 2~3mm. Due to the dynamic operation of the weighing sensor, such as when a truck passes through a floor scale or a belt scale to transfer goods, the frequency of the oscillation wave generated by gravity is generally less than 200hz, and the frequency of 30~60hz has the greatest impact on the measurement. According to the calculation of gravity acceleration, the free fall distance is within 2mm. Since the gas in the piston cylinder 9 is compressed, the eccentric stroke is set to 2~3mm to keep the system stable. The entire system of the vibration-absorbing two-phase capsule piston gravity sensor is stabilized by an external attitude sensor and a motor drive module.

[0037] Although the content of the present application has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present application. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present application can be made. Therefore, the protection scope of the present application should be limited by the appended claims.

Claims

1. A vibration-damping two-phase capsule piston gravity sensor, characterized in that: The gravity sensor comprises a guide sleeve assembly, a piston force measuring assembly and an eccentric vibration assembly; The piston force measuring assembly comprises a piston cylinder (9), a throttling metering chamber (12), an air charging nozzle (13), an air connecting cylinder (14) and a pressure gauge (15); The air connection cylinder (14) and the pressure gauge (15) are located on both sides of the inflation nozzle (13), and the throttling metering chamber (12) is fixedly arranged perpendicular to the inflation nozzle (13); The guide sleeve assembly comprises an upper protective sleeve (8), a lower protective sleeve (10), a load-bearing plate (4), a piston rod support end cover (5), a first outer plate (6), a second outer plate (7) and a ball (11); A piston cylinder (9), which is sleeved in the inner cavities of the upper protective sleeve (8) and the lower protective sleeve (10), and the piston (901) at the top of the piston cylinder (9) extends out of the upper protective sleeve (8); A groove is provided on one side of the upper protective sleeve (8) and the lower protective sleeve (10) for connecting the throttling metering chamber (12); the second outer plate (7) is fixedly provided on the outer wall of the upper protective sleeve (8) where the groove is provided, and the first outer plate (6) is fixedly provided on the other three outer walls of the upper protective sleeve (8); The eccentric vibration assembly comprises a motor (1), an eccentric wheel (2), and a transmission gear (3); one end of the motor (1) is fixedly connected to the eccentric wheel (2) via the transmission gear (3), and the other end of the motor (1) is directly fixedly connected to the eccentric wheel (2); The bottom of the eccentric vibration component is movably arranged on the top of the piston (901) through the piston rod supporting end cover (5).

2. The vibration-damping two-phase capsule piston gravity sensor according to claim 1, characterized in that: The load-bearing plate (4) is fixed on the top of the eccentric vibration component.

3. The vibration-damping two-phase capsule piston gravity sensor according to claim 1, characterized in that: A smooth convex structure made of hardwood, nylon or polytetrafluoroethylene is fixed to the inner cavities of the upper protective sleeve (8) and the lower protective sleeve (10).

4. The vibration-damping two-phase capsule piston gravity sensor according to claim 1, characterized in that: Grooves are evenly arranged on the first outer plate (6) and the second outer plate (7).

5. The vibration-damping two-phase capsule piston gravity sensor according to claim 4, characterized in that: A rolling ball (11) is arranged on the groove.

6. The vibration-damping two-phase capsule piston gravity sensor according to claim 1, characterized in that: A ceramic pressure sensor is arranged in the throttling metering chamber (12).

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