A volume measuring device and method for spherical tanks

Abstract

This invention provides a volume measuring device and method for spherical tanks, belonging to the technical field of spherical tank volume verification. The invention includes a base, four support rods, a drive mechanism, a rotating disk, and a counterweight mechanism. A circular first fixed seat is fixed on the base, and a first through hole is formed in the base. A second through hole is formed in the first fixed seat. The four support rods are circumferentially arranged on the first fixed seat. Sliding rods are slidably arranged on the lower side of the support rods, and limiting plates are provided at the outer ends of the sliding rods. The drive mechanism enables the four sliding rods to move simultaneously radially. The rotating disk is arranged on the first fixed seat and has a third through hole. A drum rotates on the rotating disk, and a steel measuring tape is wound around the drum. A balance disc is provided at the free end of the steel measuring tape. Laser rangefinders are provided on opposite sides of the balance disc. The counterweight mechanism enables the balance disc to remain relatively stable. This invention allows for the measurement of the inner diameter of the equator using a laser rangefinder without requiring manual entry into the spherical tank, making it safe and reliable.

Description

Technical Field

[0001] This invention belongs to the field of storage tank capacity verification technology, and relates to a volume measuring device and method for spherical tanks. Background Technology

[0002] A spherical tank is a closed pressure vessel used for storing and calculating liquefied petroleum gas and light liquefied chemical products. It is generally constructed in the shape of a perfect sphere. However, because the diameter varies slightly in different directions after construction, it is necessary to measure the equatorial diameter and vertical diameter of the spherical tank to calculate its accurate capacity.

[0003] Currently, commonly used methods for measuring the diameter of spherical tanks include theodolite measurement and handheld laser rangefinder measurement. Theodolite measurement method involves measuring the horizontal angle α, zenith distances Z1 and Z2, and the horizontal distance s from the theodolite center to the tank center along the tangent direction of the theodolite's optical line of sight on the tank. This allows for the calculation of the equatorial and vertical diameters of the tank. However, the horizontal distance s and the projection of the tank's center point onto the ground require manual measurement and correction. This method is complex, and given the numerous external columns supporting the tank, finding all four tangent points (top, bottom, left, and right) is quite difficult.

[0004] In addition, the handheld laser rangefinder measurement method requires the construction of a temporary platform inside the spherical tank. Personnel then manually climb into the tank with a handheld laser rangefinder to measure the inner diameter of the equator and the vertical inner diameter. Since the inside of the spherical tank is a semi-enclosed dark space, there are many safety hazards for the measurement personnel working inside. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a volume measuring device and method for spherical tanks. This invention allows for the measurement of the inner diameter of the equator using a laser rangefinder without requiring manual entry into the tank. It is simple to operate and safe and reliable.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A volume measuring device for a spherical tank, wherein the top of the spherical tank has an upper opening and a surrounding plate is provided along the edge of the upper opening, characterized in that the volume measuring device includes: a base, a circular first fixing seat fixed on the base, a first through hole on the base, and a second through hole on the first fixing seat, wherein the second through hole and the first through hole are vertically aligned.

[0008] Four support rods are arranged circumferentially on the first fixed seat. The length direction of the support rods is consistent with the radial direction of the first fixed seat. A sliding rod is slidably arranged on the lower side of the support rod, and a limiting plate is provided at the outer end of the sliding rod.

[0009] A drive mechanism, which is mounted on the base, is capable of moving four slide rods simultaneously in the radial direction.

[0010] A rotating disk is mounted on a first fixed base. The rotating disk has a third through hole located directly above a second through hole. A second rotating shaft is rotatably mounted on the rotating disk. A drum is coaxially mounted on the second rotating shaft. A steel measuring tape is wound around the drum. The free end of the steel measuring tape passes through the third through hole, the second through hole, and the first through hole in sequence, extending to the bottom of the base and having a balance plate at its end. Laser rangefinders are mounted on opposite sides of the balance plate, and the two laser rangefinders are located on the same straight line.

[0011] A counterweight mechanism is provided on the balance disc, which enables the balance disc to remain relatively stable.

[0012] Preferably, the drive mechanism includes:

[0013] The first rotating ring is coaxially rotatably mounted on the base;

[0014] Four transmission structures are provided, each of which is mounted on the base. Each of the four transmission structures corresponds to one of the four slide rods. The transmission structure can drive the corresponding slide rod to slide radially by rotating the first rotating ring.

[0015] A drive structure is mounted on a base and is capable of driving the first rotating ring to rotate.

[0016] Preferably, the transmission structure includes:

[0017] The first gear ring is coaxially fixed on the outer side of the first rotating ring;

[0018] A rack, which is disposed on the side of the slide bar along its length;

[0019] A first rotating shaft is vertically rotatably mounted on a base. A first gear and a second gear are coaxially mounted on the first rotating shaft. The first gear meshes with a first gear ring, and the second gear meshes with a rack.

[0020] Preferably, the driving structure includes:

[0021] The second gear ring is coaxially fixed on the upper side of the first rotating ring;

[0022] A horizontal shaft is provided, and a support plate is vertically fixed on the base. The horizontal shaft is horizontally rotatably mounted on the support plate. The length direction of the horizontal shaft is consistent with the radial direction of the first rotating ring.

[0023] The third gear is coaxially fixed at the inner end of the horizontal shaft, and the third gear is meshed with the second gear ring.

[0024] The first handle is fixed to the outer end of the horizontal shaft.

[0025] Preferably, the counterweight mechanism includes:

[0026] A screw, which is vertically rotatably mounted on a balance disc, has a top plate rotatably mounted on its upper end, and the free end of the steel measuring tape is fixed to the top plate;

[0027] A threaded tube, which is threadedly connected to a screw rod;

[0028] Several pull ropes are provided. Several through holes are evenly provided on the side of the balance disc along the circumference. Several through holes correspond one-to-one with several pull ropes. One end of each pull rope is fixed to the outside of the threaded tube, and the other end extends through the corresponding through hole to the bottom of the balance disc. The lower end of each pull rope is fixed to a balance block.

[0029] A lifting structure is provided, which is mounted on a balance disc and can drive the threaded tube to move up and down along the screw.

[0030] Preferably, the lifting structure includes:

[0031] A counterweight is fixed on the lower side of the balance disc. The counterweight has a mounting cavity inside, and a motor is installed inside the mounting cavity. The screw is connected to the motor in a drive connection.

[0032] A limiting structure is provided on the balance disc, and the limiting structure can restrict the rotation of the threaded tube.

[0033] Preferably, the limiting structure includes two limiting components, which are symmetrically arranged on the balance disc. Each limiting component includes:

[0034] The second slider is radially slidable on the upper side of the balance disc, and the second slider is provided with an extension plate.

[0035] A connecting rod, one end of which is hinged to the outside of a threaded tube, and the other end of which is hinged to an extension plate.

[0036] Preferably, the rotating disk is rotatably mounted on the first fixed base, an operating lever is vertically provided on the upper side of the rotating disk, a first limiting rod is horizontally provided on the side of the rotating disk, and two first vertical rods are vertically fixed on the first fixed base along the circumference. The angle between the two first vertical rods and the center of the rotating disk is 90 degrees, and the first limiting rod rotates between the two first vertical rods.

[0037] Preferably, a suction cup is hinged to the lower side of the outer end of the support rod.

[0038] A method for measuring the volume of a spherical tank using a volume measuring device includes the following steps:

[0039] S1. Place the base (2) in the upper opening (11) of the spherical tank (1), so that the four support rods (6) are mounted on the surrounding plate (111). Turn the first handle (261) to drive the first rotating ring (22) to rotate, and at the same time drive the four first gears (251) to rotate, pushing the four sliding rods (62) to slide outward.

[0040] S2. When the limiting plate (622) at the outer end of the slide rod (62) simultaneously contacts the side wall of the enclosure (111), the first through hole (21), the second through hole (31) and the third through hole (41) are located directly above the upper opening (11), and the suction cup (63) at the outer end of the support rod (6) is adsorbed onto the outer side wall of the spherical tank (1).

[0041] S3. Rotate the drum (5) to lower the steel tape measure (53). When the length of the steel tape measure (53) is close to the radius of the spherical tank (1), slow down the lowering speed and start the two laser rangefinders (74) at the same time to measure multiple sets of data and calculate the total length, where the maximum value is the inner diameter A of the equator.

[0042] S4. Drive the rotating disk (4) to rotate 90 degrees by operating lever (42) so that the line connecting the two laser rangefinders (74) on the balance disk (7) is perpendicular to the previous line. Measure multiple sets of data again and calculate the total length. The maximum value is the inner diameter of the equator B. Finally, use the average value of A and B to obtain the actual inner diameter of the equator C.

[0043] S5. Continue to rotate the drum (5) and lower the steel tape measure (53). When the balance plate (7) extends out of the opening at the bottom of the spherical tank (1), the vertical inner diameter D is obtained through the scale on the steel tape measure (53).

[0044] S6. Using the values ​​of the equatorial inner diameter C and the vertical inner diameter D, the volume V of the spherical tank is calculated using the formula.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. Place the base into the upper opening and mount it on the enclosure plate using four support rods. By rotating the first handle, the first rotating ring rotates, which in turn rotates the four first gears and the first rotating shaft. The four second gears drive the four sliding rods to slide outwards, and the four limiting plates simultaneously approach and contact the inner wall of the enclosure plate. By having the four limiting plates contact the inner wall of the enclosure plate in sequence, the position of the base is adjusted until the base is positioned directly above the upper opening and fixed in place. Then, lower the steel tape measure on the drum to lower the balance disc into the interior of the spherical tank. The lowering height of the balance disc can be seen from the scale on the steel tape measure. After lowering it to the appropriate height, slow down the lowering speed and simultaneously activate two laser rangefinders to measure multiple sets of data. The total length is calculated, and the maximum value is the inner diameter of the equator. This eliminates the trouble of building a platform inside the spherical tank, is simple to operate, and does not require manual entry into the spherical tank, making it safe and reliable.

[0047] 2. Manually rotating the first handle drives the third gear and the second gear ring to rotate via the horizontal shaft, which in turn drives the first rotating ring and the first gear ring to rotate, thereby driving the first gear and the second gear to rotate, pushing the rack and slide rod to move radially, ensuring that the four slide rods slide synchronously. The structure is simple and the transmission efficiency is high.

[0048] 3. When the balance disc is lowered, several balance blocks at the lower ends of the pull ropes are located below the balance disc, increasing the weight around the disc. These balance blocks are evenly distributed circumferentially to prevent the disc from swaying. Once the balance disc reaches the measurement height, the motor drives the screw to rotate, causing the threaded tube to move upwards. This pulls the balance blocks below the pull ropes upwards until they contact the lower side of the balance disc. Because the pull ropes are of uniform length, the balance disc remains horizontal. Simultaneously, the pull ropes act as several diagonal supports for the balance disc, preventing it from twisting and improving the accuracy of the laser rangefinder measurement. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the present invention;

[0050] Figure 2 yes Figure 1 Sectional view at point AA;

[0051] Figure 3 This is a partial view of the horizontal axis;

[0052] Figure 4 This is a partial view of the rotating disk;

[0053] Figure 5 yes Figure 2 A magnified view of a section at point B in the middle;

[0054] Figure 6 yes Figure 2 A magnified view of a section at point C;

[0055] Figure 7 This is a partial view of the balance disc;

[0056] Figure 8 yes Figure 7 Top view of the central balance disc;

[0057] Figure 9 This is a diagram showing the state of the threaded pipe moving upwards.

[0058] In the diagram, 1. Spherical tank; 11. Top opening; 111. Enclosure plate; 2. Base; 21. First through hole; 22. First rotating ring; 23. First gear ring; 24. Second gear ring; 25. First rotating shaft; 26. Horizontal shaft; 261. First handle; 262. Third gear; 263. Support plate; 3. First fixed seat; 31. Second through hole; 32. First vertical rod; 4. Rotating disk; 41. Third through hole; 411. Guide roller; 42. Operating lever; 43. First limit rod; 5. Drum; 51. Second rotating shaft; 511. External thread; 512. Fixing nut; 5 13. Fixed plate; 52. Second handle; 53. Steel tape measure; 6. Support rod; 61. First cavity; 611. First sliding groove hole; 62. Sliding rod; 621. Rack; 622. First slider; 63. Suction cup; 7. Balance disc; 71. Screw; 711. Top plate; 712. Threaded tube; 72. Second cavity; 721. Second sliding groove hole; 73. Second slider; 731. Extension plate; 74. Laser rangefinder; 75. Connecting rod; 76. Guide pulley; 77. Through hole; 8. Pull rope; 81. Balance block; 9. Counterweight; 91. Mounting cavity; 92. Motor. Detailed Implementation

[0059] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0060] like Figures 1 to 9 As shown, a volume measuring device for a spherical tank 1 is provided, wherein the top of the spherical tank 1 is provided with an upper opening 11, and a surrounding plate 111 is provided along the edge of the upper opening 11.

[0061] The volume measuring device includes a base 2, four support rods 6, a drive mechanism, a rotating disk 4, and a counterweight mechanism.

[0062] A circular first fixing seat 3 is fixed on the base 2. A first through hole 21 is opened on the base 2. A second through hole 31 is opened on the first fixing seat 3. The second through hole 31 and the first through hole 21 are directly opposite each other.

[0063] Four support rods 6 are arranged circumferentially on the first fixed base 3. The length direction of the support rods 6 is consistent with the radial direction of the first fixed base 3. A first cavity 61 is provided inside the support rod 6 along the length direction. A first sliding groove hole 611 is provided on the lower side of the support rod 6. The first sliding groove hole 611 is connected to the first cavity 61. A first slider 622 is slidably arranged in the first cavity 61. The lower side of the first slider 622 extends through the first sliding groove hole 611 to the outer tangent end of the support rod 6 and is connected to a sliding rod 62. A limiting plate 622 is provided at the outer end of the sliding rod 62.

[0064] Preferably, a suction cup 63 is hinged to the lower side of the outer end of the support rod 6. The suction cup 63 is made of rubber material and can fix the support rod 6 to prevent the support rod 6 from deflecting.

[0065] The driving mechanism is mounted on the base 2. The driving mechanism includes a first rotating ring 22, four transmission structures, and a driving structure. The first rotating ring 22 is coaxially rotatably mounted on the base 2. All four transmission structures are mounted on the base 2, and each of the four transmission structures corresponds to one of the four slide rods 62. Each transmission structure includes a first gear ring 23 and a first rotating shaft 25. The first gear ring 23 is coaxially fixed on the outer surface of the first rotating ring 22. The rack 621 is mounted along the length direction on the side of the slide rod 62. The first rotating shaft 25 is vertically rotatably mounted on the base 2. A first gear 251 and a second gear 252 are coaxially mounted on the first rotating shaft 25. The first gear 251 meshes with the first gear ring 23, and the second gear 252 meshes with the rack 621. The driving structure is mounted on the base 2 and can drive the first rotating ring 22 to rotate.

[0066] The rotating disk 4 is mounted on the first fixed base 3. The rotating disk 4 has a third through hole 41, which is located directly above the second through hole 31. A second rotating shaft 51 is rotatably mounted on the rotating disk 4 via two fixed plates 513. A roller 5 is coaxially mounted on the second rotating shaft 51. A steel measuring tape 53 is wound around the roller 5. The free end of the steel measuring tape 53 passes through the third through hole 41, the second through hole 31, and the first through hole 21 in sequence, extending to the bottom of the base 2, and a balance disk 7 is provided at the end. Laser rangefinders 74 are provided on opposite sides of the balance disk 7. The two laser rangefinders 74 are located on the same straight line. Preferably, two guide rollers 411 are rotatably mounted in the third through hole 41. The two guide rollers 411 are located on both sides of the width direction of the steel measuring tape 53, respectively, to provide auxiliary guidance.

[0067] The counterweight mechanism is installed on the balance disc 7, which enables the balance disc 7 to remain relatively stable.

[0068] The base 2 is placed into the upper opening 11 and supported on the enclosure 111 by four support rods 6. The drive structure drives the first rotating ring 22 to rotate, which in turn drives the four first gears 251 and the first rotating shaft 25 to rotate. The four second gears 252 drive the four sliding rods 62 to slide outward. The four limiting plates 621 simultaneously approach and contact the inner wall of the enclosure 111. By having the four limiting plates 621 contact the inner wall of the enclosure 111 in sequence, the position of the base 2 is adjusted, and finally the base 2 is positioned in the upper opening 11. The balance disc 7 is positioned directly above and fixed in place. Then, the steel measuring tape 53 on the reel 5 is lowered down to lower the balance disc 7 into the interior of the spherical tank 1. The lowering height of the balance disc 7 can be determined by the scale on the steel measuring tape 53. Once the appropriate height is reached, the lowering speed is slowed down, and simultaneously, two laser rangefinders 74 are activated to measure multiple sets of data. The total length is calculated, and the maximum measured value is the inner diameter at the equator. This eliminates the need for a platform to be built inside the spherical tank 1, simplifying the operation and ensuring safety and reliability without requiring manual entry into the tank. Furthermore, the counterweight mechanism keeps the balance disc 7 relatively stable, improving the accuracy of the measurements taken by the two laser rangefinders 74.

[0069] In this embodiment, the drive structure includes a second gear ring 24, a horizontal shaft 26, a third gear 262, and a first handle 261.

[0070] The second gear ring 24 is coaxially fixed on the upper side of the first rotating ring 22.

[0071] A support plate 263 is vertically fixed on the base 2, and a horizontal shaft 26 is horizontally rotatably mounted on the support plate 263. The length direction of the horizontal shaft 26 is consistent with the radial direction of the first rotating ring 22.

[0072] The third gear 262 is coaxially fixed at the inner end of the horizontal shaft 26, and the third gear 262 is meshed with the second gear ring 24.

[0073] The first handle 261 is fixed to the outer end of the horizontal shaft 26.

[0074] Manually rotating the first handle 261 drives the third gear 262 and the second gear ring 24 to rotate via the horizontal shaft 26, which in turn drives the first rotating ring 22 and the first gear ring 23 to rotate, thereby driving the first gear 251 and the second gear 252 to rotate, pushing the rack 621 and the slide rod 62 to move radially, ensuring that the four slide rods 62 slide synchronously. The structure is simple and the transmission efficiency is high.

[0075] In this embodiment, the counterweight mechanism includes a screw 71, a threaded tube 712, several pull ropes 8, and a lifting structure.

[0076] The screw 71 is vertically rotatably mounted on the balance disc 7, and a top plate 711 is rotatably mounted on the upper end of the screw 71. The free end of the steel tape measure 53 is fixedly connected to the top plate 711.

[0077] The threaded tube 712 is threaded onto the screw 71.

[0078] The balance disc 7 has a plurality of perforations 77 evenly distributed around its side edge. Preferably, the edge of the perforation 77 is provided with a guide pulley 76. The plurality of perforations 77 and the plurality of pull ropes 8 correspond one-to-one. One end of the pull rope 8 is fixed to the outside of the threaded tube 712, and the other end passes around the guide pulley 76, passes through the corresponding perforation 77 and extends to the bottom of the balance disc 7. The lower end of the pull rope 8 is fixedly connected to a balance block 81.

[0079] The lifting structure is mounted on the balance disk 7. The lifting structure includes a counterweight 9 and two limiting components. The counterweight 9 is fixed on the lower side of the balance disk 7. The counterweight 9 has a mounting cavity 91 inside. The mounting cavity 91 has a motor 92 inside. The screw 71 and the motor 92 are connected in a transmission manner. The two limiting components are symmetrically arranged on the balance disk 7. The limiting components include a second slider 73 and a connecting rod 75. The balance disk 7 has a second cavity 72 arranged radially inside. The upper side of the balance disk 7 has a second sliding groove hole 721. The second sliding groove hole 721 communicates with the second cavity 72. The second slider 73 is slidably mounted in the second cavity 72. The second slider 73 has an extension plate 731. The extension plate 731 extends through the second sliding groove hole 721 to the top of the balance disk 7. One end of the connecting rod 75 is hinged to the outside of the threaded tube 712, and the other end is hinged to the extension plate 731.

[0080] When the balance disc 7 is lowered, the balance blocks 81 at the lower ends of several pull ropes 8 are located below the balance disc 7, increasing the weight around the balance disc 7. Moreover, the balance blocks 81 are evenly distributed circumferentially to prevent the balance disc 7 from swaying. When the balance disc 7 reaches the measurement height, the motor 92 is started to drive the screw 71 to rotate, causing the threaded tube 712 to move upward, pulling the balance blocks 81 below the pull ropes 8 to move upward and finally contact the lower side of the balance disc 7. Since the pull ropes 8 are of the same length, the balance disc 7 remains horizontal. At the same time, the pull ropes 8 are equivalent to several diagonal supports for the balance disc 7, which can prevent the balance disc 7 from twisting and improve the measurement accuracy of the laser rangefinder 74. Example 2

[0081] like Figure 4As shown, the rotating disk 4 is rotatably mounted on the first fixed base 3. An operating lever 42 is vertically provided on the upper side of the rotating disk 4, and a first limiting rod 43 is horizontally provided on the side of the rotating disk 4. Two first vertical rods 32 are vertically fixed on the first fixed base 3 along the circumference. The angle between the two first vertical rods 32 and the center of the rotating disk 4 is 90 degrees. The first limiting rod 43 rotates between the two first vertical rods 32. Preferably, the length direction of the first limiting rod 43 is consistent with the width direction of the steel tape measure 53.

[0082] One end of the second rotating shaft 51 extends out of one of the fixing plates 513 and is fixedly connected to the second handle 52. The second rotating shaft 51 located outside the fixing plate 513 is provided with an external thread 511. A fixing nut 512 is threadedly connected to the external thread 511. In the initial state, the nut 512 is away from the fixing plate 513. When the steel tape measure 53 is lowered to the set height, the nut is rotated toward the fixing plate 513 so that the nut 512 contacts and presses the fixing plate 513, fixing the second rotating shaft 51 and the steel tape measure 53 on the drum 5 in the current position for easy measurement.

[0083] The rotating disk 4 is driven to rotate by the operating lever 42. When the first limit lever 43 contacts one of the first vertical bars 32, the steel tape measure 53 is lowered. The two laser rangefinders 74 measure multiple sets of data, and the maximum value obtained is the inner diameter A of the equator. Then, the rotating disk 4 is driven to rotate by the operating lever 42. When the first limit lever 43 contacts the other first vertical bar 32, the rotating disk 4 and the steel tape measure 53 have rotated exactly 90 degrees. The straight line where the two laser rangefinders 74 are located is perpendicular to the previous straight line. At this time, multiple sets of data are measured again, and the maximum value obtained is the inner diameter B of the equator. Finally, the actual inner diameter C of the equator is calculated using the average value of A and B.

[0084] Then continue rotating the drum (5) to lower the steel measuring tape (53). When the balance plate (7) extends out of the opening at the bottom of the spherical tank (1), the vertical inner diameter D is obtained by measuring the difference between the scale of the steel measuring tape (53) at the upper opening (11) and the bottom opening. Finally, using the values ​​of the equatorial inner diameter C and the vertical inner diameter D, the volume of the spherical tank in the empty state is calculated by the following formula:

[0085]

[0086] In the formula: V is the volume of the spherical tank, in L; C is the inner diameter at the equator, in mm; D is the vertical inner diameter, in mm.

Claims

1. A volume measuring device for a spherical tank, wherein the top of the spherical tank (1) is provided with an upper opening (11), and a surrounding plate (111) is provided along the edge of the upper opening (11), characterized in that, The volume measuring device includes: a base (2), a circular first fixing seat (3) fixed on the base (2), a first through hole (21) opened on the base (2), a second through hole (31) opened on the first fixing seat (3), and the second through hole (31) and the first through hole (21) facing each other vertically; Four support rods (6) are arranged circumferentially on the first fixed seat (3). The length direction of the support rods (6) is consistent with the radial direction of the first fixed seat (3). A slide rod (62) is slidably arranged on the lower side of the support rods (6). A limiting plate (622) is provided at the outer end of the slide rod (62). A drive mechanism is provided on the base (2) and the drive mechanism enables four slide bars (62) to move radially simultaneously. A rotating disk (4) is mounted on a first fixed base (3). A third through hole (41) is provided on the rotating disk (4). The third through hole (41) is located directly above the second through hole (31). A second rotating shaft (51) is rotatably mounted on the rotating disk (4). A drum (5) is coaxially mounted on the second rotating shaft (51). A steel tape measure (53) is wound around the drum (5). The free end of the steel tape measure (53) passes through the third through hole (41), the second through hole (31), and the first through hole (21) in sequence and extends to the bottom of the base (2). A balance disk (7) is provided at the end. Laser rangefinders (74) are provided on both sides of the balance disk (7). The two laser rangefinders (74) are located on the same straight line. The counterweight mechanism is set on the balance disc (7) and the counterweight mechanism can keep the balance disc (7) relatively stable; The counterweight mechanism includes: The screw (71) is vertically rotatably mounted on the balance disc (7), and the upper end of the screw (71) is rotatably mounted with a top plate (711). The free end of the steel tape measure (53) is fixedly connected to the top plate (711). A threaded tube (712) is threaded onto a screw (71); Several pull ropes (8) are provided. Several through holes (77) are evenly provided on the side of the balance disc (7) along the circumference. Several through holes (77) and several pull ropes (8) correspond one to one. One end of the pull rope (8) is fixed to the outside of the threaded tube (712), and the other end extends through the corresponding through hole (77) to the bottom of the balance disc (7). The lower end of the pull rope (8) is fixed to a balance block (81). The lifting structure is set on the balance plate (7) and can drive the threaded tube (712) to move up and down along the screw (71); The lifting structure includes: The counterweight (9) is fixed on the lower side of the balance disc (7). The counterweight (9) has a mounting cavity (91) inside, and a motor (92) is installed inside the mounting cavity (91). The screw (71) and the motor (92) are connected in a transmission. A limiting structure is provided on the balance disc (7), which can limit the rotation of the threaded tube (712).

2. The volume measuring device for a spherical tank according to claim 1, characterized in that, The drive mechanism includes: The first rotating ring (22) is coaxially rotatably mounted on the base (2); Four transmission structures are provided on the base (2). The four transmission structures correspond one-to-one with the four slide rods (62). The transmission structures can drive the corresponding slide rods (62) to slide radially by rotating the first rotating ring (22). The driving structure is mounted on the base (2) and can drive the first rotating ring (22) to rotate.

3. The volume measuring device for a spherical tank according to claim 2, characterized in that, The transmission structure includes: The first gear ring (23) is coaxially fixed on the outer side of the first rotating ring (22); A rack (621) is disposed on the side of the slide bar (62) along its length; The first rotating shaft (25) is vertically rotatably mounted on the base (2). The first rotating shaft (25) is coaxially provided with a first gear (251) and a second gear (252). The first gear (251) is meshed with the first gear ring (23), and the second gear (252) is meshed with the rack (621).

4. The volume measuring device for a spherical tank according to claim 3, characterized in that, The driving structure includes: The second gear ring (24) is coaxially fixed on the upper side of the first rotating ring (22); A horizontal shaft (26) is provided, and a support plate (263) is vertically fixed on the base (2). The horizontal shaft (26) is horizontally rotatably mounted on the support plate (263). The length direction of the horizontal shaft (26) is consistent with the radial direction of the first rotating ring (22). The third gear (262) is coaxially fixed at the inner end of the horizontal shaft (26), and the third gear (262) meshes with the second gear ring (24). The first handle (261) is fixed to the outer end of the horizontal shaft (26).

5. A volume measuring device for a spherical tank according to claim 4, characterized in that, The limiting structure includes two limiting components, which are symmetrically arranged on the balance disc (7). The limiting components include: The second slider (73) is radially slidably disposed on the upper side of the balance disk (7), and the second slider (73) is provided with an extension plate (731). A connecting rod (75), one end of which is hinged to the outside of a threaded tube (712) and the other end of which is hinged to an extension plate (731).

6. The volume measuring device for a spherical tank according to claim 5, characterized in that, The rotating disk (4) is rotatably mounted on the first fixed seat (3). The upper side of the rotating disk (4) is vertically provided with an operating rod (42). The side of the rotating disk (4) is horizontally provided with a first limiting rod (43). Two first vertical rods (32) are vertically fixed on the first fixed seat (3) along the circumference. The angle between the two first vertical rods (32) and the center of the rotating disk (4) is 90 degrees. The first limiting rod (43) rotates between the two first vertical rods (32).

7. A volume measuring device for a spherical tank according to claim 6, characterized in that, A suction cup (63) is hinged to the lower side of the outer end of the support rod (6).

8. A measurement method using the volume measuring device for spherical tanks as described in claim 7, characterized in that, Includes the following steps: S1. Place the base (2) in the upper opening (11) of the spherical tank (1), so that the four support rods (6) are mounted on the surrounding plate (111). Turn the first handle (261) to drive the first rotating ring (22) to rotate, and at the same time drive the four first gears (251) to rotate, pushing the four sliding rods (62) to slide outward. S2. When the limiting plate (622) at the outer end of the slide rod (62) simultaneously contacts the side wall of the enclosure (111), the first through hole (21), the second through hole (31) and the third through hole (41) are located directly above the upper opening (11), and the suction cup (63) at the outer end of the support rod (6) is adsorbed onto the outer side wall of the spherical tank (1). S3. Rotate the drum (5) to lower the steel tape measure (53). When the length of the steel tape measure (53) is close to the radius of the spherical tank (1), slow down the lowering speed and start the two laser rangefinders (74) at the same time to measure multiple sets of data and calculate the total length, where the maximum value is the inner diameter A of the equator. S4. Drive the rotating disk (4) to rotate 90 degrees by operating lever (42) so that the line connecting the two laser rangefinders (74) on the balance disk (7) is perpendicular to the previous line. Measure multiple sets of data again and calculate the total length. The maximum value is the inner diameter of the equator B. Finally, use the average value of A and B to obtain the actual inner diameter of the equator C. S5. Continue to rotate the drum (5) and lower the steel tape measure (53). When the balance plate (7) extends out of the opening at the bottom of the ball tank (1), the vertical inner diameter D is obtained through the scale on the steel tape measure (53). S6. Using the values ​​of the equatorial inner diameter C and the vertical inner diameter D, calculate the volume V of the spherical tank.

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