A safety depth measuring instrument for ships

Abstract

The present invention discloses a safety depth measuring instrument for ships, which relates to the technical field of ship instruments. In order to solve the accuracy problem under tilted working conditions, the instrument is composed of three groups of measuring units, a data processor and a display screen. The three groups of measuring units are respectively located at the three vertices of an isosceles right triangle. The measuring unit includes a fixed shell and a movable shell that can only slide relative to the axial direction. The side wall of the fixed shell is provided with a flange for fixing with a container. The upper inner wall of the movable shell is movably connected with a main shaft through a bracket. The present invention simultaneously monitors the liquid level by using three groups of measuring units forming a right triangle, and then determines the tilt angles in two orthogonal directions by the installation position and readings of the measuring units, and then judges the state information of the liquid according to the relationship between the angle and the reading, thereby judging the total volume of the liquid, and then combining the cross-sectional area of ​​the container, thereby obtaining the final accurate liquid level, which is more in line with the working conditions of the tilted hull of the ship during navigation.

Description

Technical Field

[0001] The invention relates to the technical field of marine instruments, and in particular to a safe depth measuring instrument for ships. Background Art

[0002] The depth measuring instrument is used to measure the liquid level depth of the water tank and oil tank of the ship, so as to determine the liquid level height in the water tank or oil tank in combination with the relative position relationship.

[0003] For example, after searching, the Chinese patent publication number CN213842321U discloses a direct-reading depth measuring instrument, including a sounding tube, a transparent cover, a bottom cover, a rotating shaft and a float. Transparent covers and bottom covers are installed at both ends of the sounding tube, and a rotating shaft and a float are installed in the sounding tube. The rotating shaft is driven to rotate by the float; the rotating shaft is installed at the lower end of the transparent cover through a mounting seat; the rotating shaft is installed on the mounting seat through a rolling bearing; a pointer is provided on the rotating shaft, and the pointer rotates with the rotating shaft. A dial is provided on the outer cover of the pointer to directly read the pointer data.

[0004] The above patent has the following deficiencies: it uses single-point measurement to measure depth and thus obtain the liquid level height, but since ships are different from other land-based equipment, the hull will tilt when sailing, and once it tilts, the measured depth data will deviate.

[0005] To this end, the present invention provides a safety depth measuring instrument for ships. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a safe depth measuring instrument for ships.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A safe depth measuring instrument for ships, which consists of three groups of measuring units, a data processor and a display screen. The three groups of measuring units are respectively located at the three vertices of an isosceles right triangle.

[0009] The depth measurement method under the tilt state includes the following steps:

[0010] S1: According to the size of the container, obtain its length L, width D and height H respectively;

[0011] S2: Number the three groups of measuring units. The one at the right angle vertex is I, and the other two are II and III. They are installed on the container. When installing, ensure that I and II are parallel to the length of the container, and I and III are parallel to the width of the container.

[0012] S3: When in use, the readings of the three measurement units are obtained respectively ;

[0013] S4: Determine the inclination of the liquid surface relative to the length of the tank based on the readings of Ⅰ and Ⅱ and the installation position , determine the inclination of the liquid surface relative to the width of the container based on the readings of Ⅰ and Ⅲ ;

[0014] S5: According to , The volume V of the solution is determined by the size of the container, and then the final liquid level is determined based on the cross-sectional area L*H of the container. , and display it on the display screen.

[0015] Preferably: in the step S4, and The method for determining the angle is the same as that for determining the angle of the , which specifically includes the following steps:

[0016] S41: First, according to the installation position of Ⅰ, determine the reverse extension distance of the two lengths / widths of Ⅰ from the container. , and the distance d between Ⅰ and Ⅱ, and between Ⅰ and Ⅲ;

[0017] S42: , .

[0018] Further: the step S5 includes the following steps:

[0019] S51: First, according to the inclination angles in two directions and And combined with the readings of the three measuring units and the size of the container, determine whether the bottom of the container is completely covered with liquid in both directions, specifically:

[0020] Determination of tilt direction:

[0021] When , it means it is fully paved, otherwise it means it is not fully paved;

[0022] When , it means it is fully paved, otherwise it means it is not fully paved;

[0023] Determination of tilt direction:

[0024] When , it means it is not fully paved, otherwise it means it is fully paved;

[0025] When , it means it is not fully paved, otherwise it means it is fully paved;

[0026] S52, then according to and The volume is calculated based on the fullness in the inclined direction, specifically:

[0027] like and The bottom of the container in all directions is filled. At this time, the liquid surface is composed of a pyramid on the upper layer and a prism on the lower layer. The volume of the liquid is the sum of the two: ,in ;

[0028] like and If the bottom of the container in all directions is not fully covered, the liquid will be in the form of a pyramid as a whole. ,in ;

[0029] like and When one of the bottom surfaces of the container in the direction is filled and the other is not filled, ,in , .

[0030] On the basis of the above scheme: the measuring unit includes a fixed shell and a movable shell which can only slide axially relative to each other, the side wall of the fixed shell is provided with a flange for fixing to the container, the upper inner wall of the movable shell is movably connected with a main shaft through a bracket, the bottom of the main shaft is used in conjunction with a float, the top inner wall of the fixed shell is provided with a speed change assembly, the top outer wall of the fixed shell is provided with a current-type digital-to-analog conversion assembly, the main shaft is connected to the current-type digital-to-analog conversion assembly through the speed change assembly, and the bottom outer wall of the flange is provided with an adsorption fixing assembly fixed to the bottom inner surface of the container.

[0031] A better solution in the above solution is: the float includes a counterweight plate and a floating plate fixed to the bottom of the counterweight plate, the side wall of the main shaft is provided with a counterweight plate, the inner side wall of the counterweight plate is rollingly connected with ball one, and the other side of ball one is rollingly matched with the inner wall of spiral groove one.

[0032] As a further solution of the present invention: a flat key slot is provided on the inner side wall of the movable shell, and a flat key protrusion fixedly installed on the outer wall of the counterweight plate is loosely fitted in the inner wall of the flat key slot.

[0033] At the same time, the speed change assembly includes a ring gear, a planetary gear meshed with the inner side of the ring gear, and a sun gear meshed with the inner side of the planetary gear. The side walls of the planetary gear are rotatably connected to the same planetary carrier through the planetary shaft. The side walls of the planetary carrier are fixedly installed with a shaft sleeve. The main shaft can only slide and fit in the inner wall of the shaft sleeve in an axially movable manner, and the sun gear is matched with the current-type digital-to-analog conversion assembly through a transmission shaft.

[0034] As a preferred embodiment of the present invention: the current-type digital-to-analog conversion component includes a shell, a conductive counterweight and a spiral resistor, the shell is fixedly installed on the top outer wall of the fixed shell, the spiral resistor is fixed to the inner wall of the shell, the conductive counterweight is slidingly coupled to the outer wall of the key-shaped groove through a key-shaped groove opened on the side wall of the transmission shaft, and the bottom of the conductive counterweight is rollingly contacted with the spiral resistor through conductive beads.

[0035] At the same time, the conductive weight plate, the conductive beads and the spiral resistor are connected in series to the same power supply circuit, and an electronic ammeter is also arranged in series in the power supply circuit.

[0036] As a more optimal solution of the present invention: the adsorption and fixing assembly includes an adsorption frame fixedly installed on the outer side wall of the bottom of the movable shell and a plurality of magnets fixed on the outer side wall of the bottom of the adsorption frame.

[0037] The beneficial effects of the present invention are:

[0038] 1. The present invention uses three groups of measuring units forming a right triangle to monitor the liquid level at the same time, and then determines the inclination angles in two orthogonal directions through the installation positions and readings of the measuring units, and then judges the state information of the liquid based on the relationship between the angles and the readings, thereby judging the total volume of the liquid, and then combining the cross-sectional area of ​​the container to obtain the final accurate liquid level, which is more in line with the operating conditions of the ship's hull tilting during navigation.

[0039] 2. The present invention sets the float to be composed of a floating plate and a counterweight plate, and on this basis, uses a ball to match the counterweight plate with a spiral groove, so as to reduce the movement friction between them. When the liquid level drops, the counterweight of the counterweight plate can overcome the movement friction, so that it can be reliably flush with the liquid surface, thereby ensuring the accuracy of the measurement.

[0040] 3. The present invention, by setting up a speed change component, utilizes the cooperation of the planetary gear, the ring gear and the sun gear, so that the rotation speed and rotation angle of the main shaft can be amplified and then input into the current-type digital-to-analog conversion component, so that when the liquid level height changes slightly, the current-type digital-to-analog conversion component can also have a relatively large reading change, thereby increasing the measurement accuracy.

[0041] 4. The present invention uses the current measurement to change the matching form of the conductive beads and the spiral resistor by the rotation of the transmission shaft, and then combines the spiral design of the spiral resistor so that when the height of the spiral resistor is constant, its relative path increases, thereby increasing the matching range with the conductive beads, thereby increasing the measurement range.

[0042] 5. The present invention arranges the movable shell and the fixed shell in an axially slidable telescopic form. On this basis, a magnet is arranged on the outer side of the bottom of the movable shell. The magnetic attraction of the magnet is used to make the bottom end face of the movable shell and the bottom of the container box attract each other, thereby ensuring the accuracy of the position and the reliability of the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the position arrangement of a safety depth measuring instrument for ships proposed by the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of a measuring unit of a safety depth measuring instrument for ships proposed by the present invention;

[0045] Figure 3 A schematic diagram of the float structure of a safe depth measuring instrument for ships proposed by the present invention;

[0046] Figure 4 This is a schematic cross-sectional structure diagram of a float of a safety depth measuring instrument for ships proposed by the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of an adsorption and fixing component of a safety depth measuring instrument for ships proposed by the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of a speed change assembly of a safety depth measuring instrument for ships proposed by the present invention;

[0049] Figure 7 This is a schematic diagram of the structure of a current-type digital-to-analog conversion component of a safety depth measuring instrument for ships proposed by the present invention;

[0050] Figure 8 The present invention is a schematic diagram of the circuit structure of a safe depth measuring instrument for ships.

[0051] In the figure: 1-flange, 2-fixed shell, 3-movable shell, 4-adsorption and fixing component, 5-float, 6-spindle, 7-bracket, 8-speed change component, 9-current digital-to-analog conversion component, 10-spiral groove one, 11-floating plate, 12-counterweight plate, 13-ball one, 14-adsorption frame, 15-magnet, 16-planetary gear, 17-planetary shaft, 18-gear ring, 19-shaft sleeve, 20-planetary frame, 21-sun gear, 22-transmission shaft, 23-housing, 24-key groove, 25-conductive counterweight plate, 26-conductive bead, 27-spiral resistor, 28-flat key protrusion, 29-flat key groove. DETAILED DESCRIPTION

[0052] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0053] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] Embodiment 1:

[0055] A safety depth measuring instrument for ships, such as Figure 1 As shown, it is composed of three groups of measuring units, a data processor and a display screen. The three groups of measuring units are respectively located at the three vertices of an isosceles right triangle. The depth measurement method thereof in an inclined state includes the following steps:

[0056] S1: According to the size of the container, obtain its length L, width D and height H respectively;

[0057] S2: Number the three groups of measuring units. The one at the right angle vertex is I, and the other two are II and III. They are installed on the container. When installing, ensure that I and II are parallel to the length of the container, and I and III are parallel to the width of the container.

[0058] S3: When in use, the readings of the three measurement units are obtained respectively ;

[0059] S4: Determine the inclination of the liquid surface relative to the length of the tank based on the readings of Ⅰ and Ⅱ and the installation position , determine the inclination of the liquid surface relative to the width of the container based on the readings of Ⅰ and Ⅲ ;

[0060] S5: According to , The volume V of the solution is determined by the size of the container, and then the final liquid level is determined based on the cross-sectional area L*H of the container. , and display it on the display screen.

[0061] In the step S4, and The method for determining the angle is the same as that for determining the angle of the , but using different measurement units, which specifically includes the following steps:

[0062] S41: First, according to the installation position of Ⅰ, determine the reverse extension distance of the two lengths / widths of Ⅰ from the container. , and the distance d between Ⅰ and Ⅱ, and between Ⅰ and Ⅲ;

[0063] S42: , .

[0064] The step S5 comprises the following steps:

[0065] S51: First, according to the inclination angles in two directions and And combined with the readings of the three measuring units and the size of the container, determine whether the bottom of the container is completely covered with liquid in both directions, specifically:

[0066] Determination of tilt direction:

[0067] When , it means it is fully paved, otherwise it means it is not fully paved;

[0068] When , it means it is fully paved, otherwise it means it is not fully paved;

[0069] Determination of tilt direction:

[0070] When , it means it is not fully paved, otherwise it means it is fully paved;

[0071] When , it means it is not fully paved, otherwise it means it is fully paved.

[0072] S52, then according to and The volume is calculated based on the fullness in the inclined direction, specifically:

[0073] like and The bottom surface of the container in all directions is filled. At this time, the liquid surface is composed of a pyramid on the upper layer and a prism on the lower layer. The liquid volume is the sum of the two. When calculating, only consider and In the case of , it reflects the direction of inclination, that is, this embodiment only uses I as the relative highest liquid point for calculation, and the other three cases only represent different inclination directions, but the calculation logic is the same, all using the volume calculation formula of similar triangles, pyramids, and cubes: ,in ;

[0074] like and If the bottom of the container in all directions is not fully covered, the liquid will be in the form of a pyramid as a whole. ,in ;

[0075] like and When one of the bottom surfaces of the container in the direction is filled and the other is not filled (in is filled up, then ,in , .

[0076] In this embodiment, three groups of measuring units forming a right triangle are used to monitor the liquid level simultaneously, and then the inclination angles in two orthogonal directions are determined by the installation positions and readings of the measuring units. Then, the state information of the liquid is judged based on the relationship between the angles and the readings, thereby judging the total volume of the liquid. Combined with the cross-sectional area of ​​the container, the final accurate liquid level height is obtained, which is more in line with the operating conditions of the ship's hull tilting during navigation.

[0077] Embodiment 2:

[0078] A safety depth measuring instrument for ships, such as Figure 2-8 As shown, in order to solve the problem of measurement accuracy of a single measuring unit; this embodiment makes the following improvements on the basis of embodiment 1: the measuring unit includes a fixed shell 2 and a movable shell 3 that can only slide axially relative to each other, the side wall of the fixed shell 2 is provided with a flange 1 for fixing to the container, the upper inner wall of the movable shell 3 is movably connected with a main shaft 6 through a bracket 7, and the bottom of the main shaft 6 is used in conjunction with a float 5, the top inner wall of the fixed shell 2 is provided with a speed change component 8, the top outer wall of the fixed shell 2 is provided with a current-type digital-to-analog conversion component 9, the main shaft 6 is connected to the current-type digital-to-analog conversion component 9 through the speed change component 8, and the bottom outer wall of the flange 1 is provided with an adsorption fixing component 4 fixed to the bottom inner surface of the container.

[0079] The float 5 includes a counterweight plate 12 and a floating plate 11 fixed to the bottom of the counterweight plate 12. The side wall of the main shaft 6 is provided with a counterweight plate 12. The inner side wall of the counterweight plate 12 is rollingly connected with a ball 13, and the other side of the ball 13 is rollingly matched with the inner wall of the spiral groove 10.

[0080] The inner wall of the movable shell 3 is provided with a flat key groove 29 , and the counterweight plate 12 is loosely fitted in the inner wall of the flat key groove 29 through a flat key protrusion 28 welded on the outer wall thereof.

[0081] When ball 13 is affected by the buoyancy of the liquid, it will drive the counterweight plate 12 to rise, thereby driving the main shaft 6 to rotate through the cooperation between ball 13 and spiral groove 10, and when the liquid level drops, the counterweight of the counterweight plate 12 can overcome the friction of movement, so that it can be reliably flush with the liquid surface.

[0082] The device, by configuring the float 5 to consist of a floating plate 11 and a counterweight plate 12, on this basis, utilizes a ball 13 to match the counterweight plate 12 with a spiral groove 10, thereby reducing the movement friction therebetween, and when the liquid level drops, the counterweight of the counterweight plate 12 can overcome the movement friction, making it reliably flush with the liquid surface, thereby ensuring the accuracy of the measurement.

[0083] The speed change assembly 8 includes a ring gear 18, a planetary gear 16 meshed with the inner side of the ring gear 18, and a sun gear 21 meshed with the inner side of the planetary gear 16. The side wall of the planetary gear 16 is rotatably connected to the same planetary carrier 20 through a planetary shaft 17. A shaft sleeve 19 is welded to the side wall of the planetary carrier 20. The main shaft 6 can only be axially moved and slidably fitted to the inner wall of the shaft sleeve 19, and the sun gear 21 is transmitted and fitted to the current-type digital-to-analog conversion assembly 9 through a transmission shaft 22. When the main shaft 6 rotates, it can drive the shaft sleeve 19 to rotate, thereby driving the planetary gear 16 to revolve, and then utilizing the rotation of the planetary gear 16 to drive the sun gear 21 to rotate.

[0084] The current-type digital-to-analog conversion component 9 includes a shell 23, a conductive counterweight 25 and a spiral resistor 27. The shell 23 is fixed to the top outer wall of the fixed shell 2 by bolts, and the spiral resistor 27 is fixed to the inner wall of the shell 23. The conductive counterweight 25 is slidably coupled to the outer wall of the key-shaped groove 24 through the key-shaped groove 24 opened on the side wall of the transmission shaft 22, and the bottom of the conductive counterweight 25 is rollingly contacted with the spiral resistor 27 through the conductive beads 26.

[0085] The conductive weight plate 25, the conductive beads 26 and the spiral resistor 27 are connected in series to the same power supply circuit, and an electronic ammeter is also connected in series in the power supply circuit.

[0086] When the transmission shaft 22 rotates, it will drive the conductive counterweight plate 25 to rotate, thereby driving the conductive beads 26 to roll along the spiral resistor 27, so that the length of the spiral resistor 27 connected to the power supply circuit changes, thereby causing the circuit resistance to change, thereby causing the reading of the electronic ammeter to change, and then the contact position of the conductive beads 26 and the spiral resistor 27 is determined according to the reading of the electronic ammeter, thereby determining the number of rotations of the transmission shaft 22, thereby determining the number of rotations of the main shaft 6, and then determining the moving distance of the counterweight plate 12, thereby determining the liquid level position.

[0087] The device, by setting up a speed change component 8, utilizes the cooperation of the planetary gear 16, the ring gear 18 and the sun gear 21, so that the rotation speed and rotation angle of the main shaft 6 can be amplified and then input into the current digital-to-analog conversion component 9, so that when the liquid level height changes slightly, the current digital-to-analog conversion component 9 can also have a relatively large reading change, thereby increasing the measurement accuracy.

[0088] In addition, the device uses current measurement and utilizes the rotation of the transmission shaft 22 to change the matching form of the conductive beads 26 and the spiral resistors 27. Combined with the spiral design of the spiral resistors 27, when the height of the spiral resistors 27 is constant, the relative path of the spiral resistors 27 is increased, thereby increasing the matching range with the conductive beads 26, thereby increasing the measurement range.

[0089] To solve reliability issues such as Figure 2 , 5 As shown, the adsorption fixing assembly 4 includes an adsorption frame 14 fixed to the outer side wall of the bottom of the movable shell 3 by bolts and a plurality of magnets 15 fixed to the outer side wall of the bottom of the adsorption frame 14 .

[0090] Due to the different depths of the container, if the entire measuring unit cannot be inserted into the interior of the container, measurement data errors will occur. For this reason, the device arranges the movable shell 3 and the fixed shell 2 in an axially slidable telescopic form. On this basis, a magnet 15 is arranged on the outer side of the bottom of the movable shell 3. The magnetic attraction of the magnet 15 is used to make the bottom end face of the movable shell 3 and the bottom of the container attract each other, thereby ensuring the accuracy of the position and thus ensuring the reliability of the measurement data.

[0091] When the present embodiment is in use, the measuring unit is fixed to the container by the flange 1, and at this time the planetary gear 16 is adsorbed on the bottom of the container. When in use, the ball 13 is subjected to the buoyancy of the liquid, which drives the counterweight plate 12 to rise, thereby driving the main shaft 6 to rotate through the cooperation between the ball 13 and the spiral groove 10. When the main shaft 6 rotates, it can drive the shaft sleeve 19 to rotate, thereby driving the planetary gear 16 to revolve, and then use the rotation of the planetary gear 16 to drive the sun gear 21 to rotate. When the transmission shaft 22 rotates, it will drive the conductive counterweight plate 25 to rotate, thereby driving the conductive bead 26 to roll along the spiral resistor 27, so that the length of the spiral resistor 27 connected to the power supply circuit changes, thereby causing the circuit resistance to change, thereby causing the reading of the electronic ammeter to change, thereby determining the contact position of the conductive bead 26 and the spiral resistor 27 according to the reading of the electronic ammeter, thereby determining the number of rotations of the transmission shaft 22, thereby determining the number of rotations of the main shaft 6, and then determining the moving distance of the counterweight plate 12, thereby determining the liquid level position.

[0092] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A safe depth measuring instrument for ships, which consists of three groups of measuring units, a data processor and a display screen, the three groups of measuring units are respectively located at the three vertices of an isosceles right triangle, characterized in that: The depth measurement method under the tilt state includes the following steps: S1: According to the size of the container, obtain its length L, width D and height H respectively; S2: Number the three groups of measuring units. The one at the right angle vertex is I, and the other two are II and III. They are installed on the container. When installing, ensure that I and II are parallel to the length of the container, and I and III are parallel to the width of the container. S3: When in use, the readings of the three measurement units are h Ⅰ 、h Ⅱ 、h Ⅲ ; S4: Determine the inclination angle θ1 of the liquid surface relative to the length direction of the container according to the readings of Ⅰ and Ⅱ and the installation position, and determine the inclination angle θ2 of the liquid surface relative to the width direction of the container according to the readings of Ⅰ and Ⅲ; S5: Determine the solution volume V based on θ1, θ2 and the size of the container, and then determine the final liquid level height based on the cross-sectional area L*H of the container. And it can be displayed through the display screen; In step S4, the method for determining the angles of θ1 and θ2 is the same, which specifically includes the following steps: S41: First, according to the installation position of Ⅰ, determine the reverse extension distances l1 and l2 of the two lengths / widths of Ⅰ from the container, as well as the distance d between Ⅰ and Ⅱ, and between Ⅰ and Ⅲ; S42: The step S5 comprises the following steps: S51: First, according to the inclination angles θ1 and θ2 in the two directions and the readings of the three measuring units and the size of the container, it is determined whether the bottom surface of the container is completely covered with liquid in the two directions, specifically: Determination of the tilt direction of θ1: h Ⅰ Greater than h Ⅱ When If the number is 0, it means it is fully paved, otherwise it means it is not fully paved; h Ⅰ Less than h Ⅱ When If the number is 0, it means it is fully paved, otherwise it means it is not fully paved; Determination of the tilt direction of θ2: h Ⅰ Greater than h Ⅲ When If the number is 0, it means it is not fully paved, otherwise it means it is fully paved; h Ⅰ Less than h Ⅲ When If the number is 0, it means it is not fully paved, otherwise it means it is fully paved; S52, then calculate the volume according to the fullness in the inclined directions of θ1 and θ2, specifically: If the bottom of the container in the directions of θ1 and θ2 are all covered, the liquid surface is a pyramid on the upper layer and a prism on the lower layer. The volume of the liquid is the sum of the two: in If the bottom surface of the container in the directions of θ1 and θ2 is not fully covered, the liquid will be in the form of a pyramid as a whole. in If one of the bottom surfaces of the container in the directions of θ1 and θ2 is filled and the other is not filled, then in 2. A safe depth measuring instrument for ships according to claim 1, characterized in that: The measuring unit comprises a fixed shell (2) and a movable shell (3) which can only slide relative to each other in the axial direction. The side wall of the fixed shell (2) is provided with a flange (1) for fixing to a container. The upper inner wall of the movable shell (3) is movably connected to a main shaft (6) through a bracket (7). The bottom of the main shaft (6) is used in conjunction with a float (5). The top inner wall of the fixed shell (2) is provided with a speed change component (8). The top outer wall of the fixed shell (2) is provided with a current-type digital-to-analog conversion component (9). The main shaft (6) is connected to the current-type digital-to-analog conversion component (9) through the speed change component (8). The bottom outer wall of the flange (1) is provided with an adsorption fixing component (4) fixed to the bottom inner surface of the container.

3. A safe depth measuring instrument for ships according to claim 2, characterized in that: The float (5) comprises a counterweight plate (12) and a floating plate (11) fixed to the bottom of the counterweight plate (12); the side wall of the main shaft (6) is provided with the counterweight plate (12); the inner side wall of the counterweight plate (12) is rollingly connected with a ball bearing (13); the other side of the ball bearing (13) is rollingly matched with the inner wall of the spiral groove (10).

4. A safe depth measuring instrument for ships according to claim 3, characterized in that: The inner side wall of the movable shell (3) is provided with a flat key groove (29), and the counterweight plate (12) is loosely fitted in the inner wall of the flat key groove (29) through a flat key protrusion (28) fixedly mounted on the outer wall thereof.

5. A safe depth measuring instrument for ships according to claim 2, characterized in that: The speed change assembly (8) comprises a ring gear (18), a planetary gear (16) meshed with the inner side of the ring gear (18), and a sun gear (21) meshed with the inner side of the planetary gear (16); the side wall of the planetary gear (16) is rotatably connected to the same planetary carrier (20) via a planetary shaft (17); a shaft sleeve (19) is fixedly mounted on the side wall of the planetary carrier (20); the main shaft (6) is slidably matched with the inner wall of the shaft sleeve (19) in an axially movable manner only; and the sun gear (21) is driven and matched with the current-type digital-to-analog conversion assembly (9) via a transmission shaft (22).

6. A safe depth measuring instrument for ships according to claim 5, characterized in that: The current-type digital-to-analog conversion component (9) comprises a housing (23), a conductive weight plate (25) and a spiral resistor (27); the housing (23) is fixedly mounted on the top outer wall of the fixed shell (2); the spiral resistor (27) is fixed to the inner wall of the housing (23); the conductive weight plate (25) is slidably coupled to the outer wall of the key-shaped groove (24) through a key-shaped groove (24) provided on the side wall of the transmission shaft (22); and the bottom of the conductive weight plate (25) is rollingly coupled to the spiral resistor (27) through a conductive bead (26).

7. A safe depth measuring instrument for ships according to claim 6, characterized in that: The conductive weight plate (25), the conductive beads (26) and the spiral resistor (27) are connected in series to the same power supply circuit, and an electronic ammeter is also connected in series to the power supply circuit.

8. A safe depth measuring instrument for ships according to claim 2, characterized in that: The adsorption fixing component (4) comprises an adsorption frame (14) fixedly mounted on the outer side wall of the bottom of the movable shell (3) and a plurality of magnets (15) fixed on the outer side wall of the bottom of the adsorption frame (14).

Images