A deep-sea high-pressure environment force measuring device

Abstract

The application discloses a kind of deep-sea high-pressure environment force measuring device, including pressure tank in deep-sea high-pressure environment, force shaft, force sensor, force auxiliary part;The upper and lower ends of pressure tank are respectively provided with the through hole that can be closely matched with the upper and lower ends of force shaft, two through holes are respectively arranged in the upper and lower ends of force shaft, the cross-sectional area of the upper and lower ends of force shaft is equal, force auxiliary part is located in pressure tank and is fixed with force shaft, one end of force sensor is installed in the upper end or lower end of pressure tank, the other end of force sensor is in abutment with force auxiliary part;By installing force sensor in pressure tank, force sensor is isolated from deep sea, so that force sensor is not affected by water and water pressure, to ensure that force sensor can work normally under deep-sea high-pressure environment, and by measuring the force difference of the two ends of force shaft, force measurement under deep-sea high-pressure environment is realized, and the pressure generated by high pressure is offset by using force balance.

Description

Technical Field

[0001] The present invention relates to the technical field of force measuring devices, and particularly to a force measuring device for deep-sea high-pressure environments. Background Technology

[0002] The deep-sea environment is characterized by high water pressure and high salt corrosion. Equipment operating in the deep sea experiences background pressure close to its depth; for example, the pressure at a depth of 6000 meters is close to 60 MPa. A conventional method to overcome this high background water pressure is to use an oil-filled cavity with elastic moving parts, allowing the pressure inside and outside the cavity to reach equilibrium through these elastic parts (such as rubber diaphragms or pistons). However, because some components are not designed to withstand high pressure—such as the force bridge circuit and cavity of a tension / compression force sensor, or capacitors in the data acquisition circuit—these sensors cannot be used directly underwater. With the increasing frequency of deep-sea exploration and mining activities, resistance measurements in deep-sea static cone penetration tests, mineral weight measurements in mining vehicles, and torque measurements in in-situ shearing instruments all require force-measuring devices to meet operational needs. However, because these sensors cannot be used directly underwater, force measurement work cannot proceed normally. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the background art above and to provide a force measuring device that can measure force in a deep-sea high-pressure environment.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0005] A force measuring device for a deep-sea high-pressure environment is characterized by comprising a pressure-resistant tank, a force-bearing shaft, a force sensor, and a force measuring auxiliary component placed in the deep-sea high-pressure environment; the pressure-resistant tank has through holes at its upper and lower ends that can tightly fit with the upper and lower ends of the force-bearing shaft; the force-bearing shaft has two through holes at its upper and lower ends respectively; the cross-sectional areas of the upper and lower ends of the force-bearing shaft are equal; the force measuring auxiliary component is located inside the pressure-resistant tank and fixed to the force-bearing shaft; one end of the force sensor is installed at the upper or lower end of the pressure-resistant tank; and the other end of the force sensor abuts against the force measuring auxiliary component.

[0006] As a further improvement to the above technical solution:

[0007] The force to be measured is transmitted to the force sensor through the force-bearing shaft.

[0008] The two through holes on the pressure tank are symmetrical.

[0009] The pressure tank includes a pressure-resistant cylinder and an end cap covering the pressure-resistant cylinder.

[0010] A sealing ring is provided between the through hole and the force-bearing shaft.

[0011] The force sensor is a tension / compression sensor.

[0012] The deep-sea high-pressure environment force measuring device includes a friction cylinder, the pressure tank is located inside the friction cylinder, and the upper and lower ends of the force-bearing shaft are respectively connected to the upper and lower ends of the friction cylinder; friction surfaces are provided on both sides of the friction cylinder.

[0013] The force sensor is a torque sensor, and the force measuring auxiliary component includes a transmission mechanism. The transmission mechanism includes a first link, a second link, and a third link that are sequentially and movably connected. The other end of the first link is connected to the force-bearing shaft, and the other end of the third link is connected to the torque sensor.

[0014] The lengths of the first link and the second link are equal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] This invention discloses a force measuring device for deep-sea high-pressure environments. By installing a force sensor inside a pressure-resistant tank, the force sensor is isolated from the deep sea, protecting it from water and water pressure. This ensures the force sensor can operate normally under the high-pressure environment of the deep sea. The device measures force under high-pressure conditions by measuring the force difference between the two ends of the force shaft, utilizing force balance to counteract the pressure generated by the high pressure. Specifically, when the pressures on both ends of the force shaft are equal, the force measured by the force sensor is zero. When the pressures on both ends of the force shaft are unequal, and the pressure difference is F, the force measured by the force sensor is F minus the frictional force on the force shaft, with the direction being the same as the direction of the force on the side with greater pressure (if the force is friction, the direction is opposite to the frictional force). This device can not only measure the magnitude of the force on the force shaft under high-pressure conditions in the deep sea, but also measure the direction of the force. It can be applied to the measurement of various forces using static cone penetration testing probes, and can also be applied to various scenarios requiring force measurement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional structural schematic diagram of the force measuring device in a deep-sea high-pressure environment according to the first embodiment of the present invention.

[0019] Figure 2This is a cross-sectional structural schematic diagram of the force measuring device in a deep-sea high-pressure environment according to the second embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional structural schematic diagram of the force measuring device in a deep-sea high-pressure environment according to the third embodiment of the present invention.

[0021] Figure 4 This is a planar structural schematic diagram of the transmission mechanism of the present invention.

[0022] The labels in the diagram represent:

[0023] 1. End cap; 2. Pressure-resistant cylinder; 3. Force-bearing shaft; 31. Upper end of force-bearing shaft; 32. Force sensor; 33. Lower end of force-bearing shaft; 34. Force-measuring auxiliary component; 35. Friction cylinder; 4. Transmission mechanism; 41. First connecting rod; 42. Second connecting rod; 43. Third connecting rod. Detailed Implementation

[0024] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0025] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0026] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0027] Figures 1 to 4An embodiment of the force measuring device for deep-sea high-pressure environments of the present invention is shown, including a pressure tank, a force-bearing shaft 3, a force sensor 32, and a force measuring auxiliary component 34. The pressure tank has through holes at its upper and lower ends. The force-bearing shaft 3 passes through the pressure tank, and the upper end 31 and lower end 33 of the pressure tank pass through two through holes and are tightly fitted with them. The cross-sectional areas of the upper and lower ends of the force-bearing shaft 3 are equal to ensure a close connection between the force-bearing shaft 3 and the through holes, guaranteeing a tight seal. The force measuring auxiliary component 34 is located inside the pressure tank and fixed to the force-bearing shaft 3. One end of the force sensor 32 is installed at the upper end 31 or lower end 33 of the pressure tank, and the other end of the force sensor 32 abuts against the force measuring auxiliary component 34. This deep-sea high-pressure environment force measuring device isolates the force sensor 32 from the deep sea by installing it inside a pressure-resistant tank, protecting it from water and water pressure. This ensures the force sensor 32 can operate normally under the high-pressure environment of the deep sea. It utilizes force balance to counteract the pressure generated by the high pressure and measures the force difference between the two ends of the force shaft 3 to measure the force under the high-pressure environment of the deep sea. Specifically, when the pressures on both ends of the force shaft 3 are equal, the force measured by the force sensor 32 is zero. When the pressures on both ends of the force shaft 3 are unequal, and the pressure difference is F, the force measured by the force sensor 32 is F minus the frictional force on the force shaft 3, with the direction being the same as the direction of the force on the side with the greater pressure (if it is frictional force, the direction is opposite to the frictional force). This device can not only measure the magnitude of the force on the force shaft 3 under the high-pressure environment of the deep sea, but also measure the direction of the force. It can be applied to the measurement of various forces by the measuring probe of static cone penetration testing, and can also be applied to various scenarios requiring force measurement.

[0028] In this embodiment, the force to be measured is transmitted to the force sensor 32 through the force shaft 3.

[0029] In this embodiment, the two through holes on the pressure tank are symmetrical, ensuring that the pressure on both ends of the force shaft 3 can cancel each other out, making it easy to measure the magnitude and direction of the force in unavoidable high-pressure environments by using the force balance method.

[0030] In this embodiment, the pressure tank includes a pressure-resistant cylinder 2 and an end cap 1 covering the pressure-resistant cylinder 2. The pressure tank can be equipped with one end cap 1, or multiple end caps 1, or the pressure tank can be set as a pressure tank without an opening, as long as it is ensured that there is no other pressure interference inside the pressure tank. In this embodiment, for ease of installation, two end caps 1 are provided, which are respectively covered at the upper and lower ends of the pressure-resistant cylinder 2, and the through hole is set on the end cap 1. One end of the force sensor 32 is also installed on the end cap 1.

[0031] In this embodiment, a sealing ring is provided between the through hole and the force-bearing shaft 3 to ensure a closed environment inside the pressure tank and avoid affecting the measurement quality of the force sensor 32.

[0032] This embodiment has three implementations, the first embodiment (as shown in the example) Figure 1 As shown):

[0033] Force sensor 32 is a tension / compression sensor used to measure tension and compression, as detailed below:

[0034] The cross-sectional area of ​​the upper end 31 of the force-bearing shaft is S5, the water pressure is P, and the water pressure it receives is F1 = P * S5, directed downwards.

[0035] The cross-sectional area of ​​the lower end 33 of the force-bearing shaft is S4, the water pressure is P, and the water pressure it receives is F2 = P * S4, directed upwards.

[0036] Since S4 = S5, F1 = F2. The magnitudes of forces F1 and F2 are equal, and their directions are opposite. Ignoring the influence of friction, the force axis 3 is in a state of force equilibrium, and the force measured by the tension and compression sensor is zero.

[0037] In this state, an additional pressure F3 (the force to be measured) is applied to the lower end 33 of the force-bearing shaft 3, directed upwards. The resultant force on the force-bearing shaft 3 is directed upwards, and the magnitude of the resultant force is F3. The force-bearing shaft 3 transmits the force to the tension / compression sensor through the force-measuring auxiliary component 34. The force measured by the tension / compression sensor is F3'(F3-F 受力轴3摩擦 ), the direction is upward.

[0038] Conversely, an additional tensile force F3 (the force to be measured) is applied downwards to the lower end 33 of the force-bearing shaft 3. The resultant force on the force-bearing shaft 3 is downwards, and the magnitude of the resultant force is F3. The force-bearing shaft 3 transmits the force to the tension / compression sensor through the force-measuring auxiliary component 34. The force measured by the tension / compression sensor is F3'(F3-F 受力轴3摩擦 ), direction downwards.

[0039] This device can measure the magnitude and direction of forces on a shaft under deep-water, high-pressure conditions. It can be used to measure the cone tip resistance of a static cone penetration test probe, and can also be applied to various scenarios that require force measurement.

[0040] The second embodiment (such as) Figure 2 As shown):

[0041] It includes a friction cylinder 35, a pressure tank located inside the friction cylinder 35, and the upper and lower ends of the force-bearing shaft 3 are connected to the upper end 31 and the lower end 33 of the friction cylinder 35, respectively.

[0042] A frictional force F4 is applied to the friction cylinder 35 (the friction is the same as when it is inserted downwards into the mud, and the mud gives the friction cylinder 35 a frictional force), directed upwards. The resultant force on the force shaft 3 is directed upwards, and the magnitude of the resultant force is F4. The force shaft 3 is transmitted to the tension / compression sensor through the force measuring auxiliary component 34. The force measured by the tension / compression sensor is F4'(F4-F受力轴3摩擦 ), direction downwards.

[0043] Conversely, a frictional force F4 is applied to the friction cylinder 35 (the friction is the same as when it is inserted downwards into the mud, and the mud gives the friction cylinder 35 a frictional force), directed downwards. The resultant force on the force-bearing shaft 3 is directed upwards, and the magnitude of the resultant force is F4. The force-bearing shaft 3 is transmitted to the tension / compression sensor through the force-measuring auxiliary component 34. The force measured by the tension / compression sensor is F4'(F4-F 受力轴3摩擦 ), the direction is upward.

[0044] This device can measure the magnitude and direction of frictional force on the sidewall of a shaft in a deep-water, high-pressure environment. It can be used to measure the frictional resistance of a probe in a static cone penetration test, and can also be used in various scenarios that require force measurement.

[0045] The third embodiment (such as) Figure 3 (As shown): The force sensor 32 is a torque sensor, and the force measuring auxiliary component 34 includes a transmission mechanism 4. The transmission mechanism 4 includes a first connecting rod 41, a second connecting rod 42, and a third connecting rod 43 that are connected in sequence. The other end of the first connecting rod 41 is connected to the force-bearing shaft 3, and the other end of the third connecting rod 43 is connected to the torque sensor. The lengths of the first connecting rod 41 and the second connecting rod 42 are equal.

[0046] When the force-bearing shaft 3 is subjected to a torsional force F5, the force-bearing shaft 3 drives the first connecting rod 41 to twist, which in turn drives the second connecting rod 42 and the third connecting rod 43 to twist. The torque sensor measures the magnitude of the torque F5' (F5-F) through the torque applied to the third connecting rod 43. 受力轴3摩擦 The direction is the same as the direction of the torsional force F5.

Claims

1. A force measuring device for deep-sea high-pressure environments, characterized in that: The system includes a pressure-resistant tank placed in a high-pressure environment in the deep sea, a force-bearing shaft (3), a force sensor (32), and a force-measuring auxiliary component (34). The pressure-resistant tank has through holes at its upper and lower ends that can be tightly fitted with the upper and lower ends of the force-bearing shaft. The force-bearing shaft (3) has two through holes at its upper and lower ends. The cross-sectional areas of the upper and lower ends of the force-bearing shaft (3) are equal. The force-measuring auxiliary component (34) is located inside the pressure-resistant tank and fixed to the force-bearing shaft (3). One end of the force sensor (32) is installed at the upper or lower end of the pressure-resistant tank, and the other end of the force sensor (32) abuts against the force-measuring auxiliary component (34). When the pressures on both ends of the force shaft (3) are equal, the force sensor (32) measures zero. When the pressures on both ends of the force shaft (3) are unequal and the pressure difference between the two ends is F, the force sensor (32) measures F minus the friction force on the force shaft (3), and the direction is the same as the direction of the force of the side with greater pressure.

2. The force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: The force to be measured is transmitted to the force sensor (32) through the force shaft (3).

3. The force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: The two through holes on the pressure tank are symmetrical.

4. The force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: The pressure tank includes a pressure-resistant cylinder (2) and an end cap (1) covering the pressure-resistant cylinder (2).

5. A force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: A sealing ring is provided between the through hole and the force-bearing shaft (3).

6. A force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: The force sensor (32) is a tension / compression sensor.

7. A force measuring device for deep-sea high-pressure environments according to claim 6, characterized in that: The deep-sea high-pressure environment force measuring device includes a friction cylinder (35), the pressure tank is located inside the friction cylinder (35), the upper and lower ends of the force shaft (3) are respectively connected to the upper and lower ends of the friction cylinder (35), and friction surfaces (350) are respectively provided on both sides of the friction cylinder (35).

8. A force measuring device for deep-sea high-pressure environments according to claim 1, characterized in that: The force sensor (32) is a torque sensor, and the force measuring auxiliary component (34) includes a transmission mechanism (4). The transmission mechanism (4) includes a first connecting rod (41), a second connecting rod (42), and a third connecting rod (43) connected in sequence. The other end of the first connecting rod (41) is connected to the force-bearing shaft (3), and the other end of the third connecting rod (43) is connected to the torque sensor.

9. A force measuring device for deep-sea high-pressure environments according to claim 8, characterized in that: The first link (41) and the second link (42) have the same length.

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