Acoustic Doppler flow velocity measuring device

Abstract

The utility model discloses an acoustic Doppler flow velocity measuring device which comprises a lifting support, a chain guide rail is arranged on the lifting support, and a chain used for pulling a measuring mechanism is arranged in the chain guide rail. The first lifting mechanism comprises a driving part which is provided with an output shaft, a winding drum is arranged on the output shaft, and a steel wire for pulling the measuring mechanism to lift is wound on the winding drum; the second lifting mechanism comprises an arc-shaped guide rail, an arc-shaped groove is formed in the guide rail, and the chain can extend into the guide rail from one end of the arc-shaped groove and extend out of the guide rail from the other end of the arc-shaped groove; and the chain wheel is fixedly connected to one end of the output shaft and is meshed with the chain. According to the utility model, the first lifting mechanism and the second lifting mechanism are arranged at the same time, and when one lifting mechanism breaks down, the other lifting mechanism can be used for driving, so that the phenomenon that the measuring mechanism cannot be pulled due to the damage of the lifting mechanism is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of water flow velocity measurement devices, and in particular to an acoustic Doppler flow velocity measurement device. Background Technology

[0002] An acoustic Doppler current profiler is an instrument specifically designed to measure the velocity of water flow. It utilizes the acoustic Doppler effect, which states that the frequency of the observed sound waves changes when there is relative motion between the sound source and the observer. This effect can be used to accurately measure the speed of water flow.

[0003] However, existing measuring devices only have a lifting mechanism for pulling the measuring mechanism up and down. If this lifting mechanism is damaged, the measuring mechanism will be unable to move up or down. In this case, other power equipment needs to be transported to the test site and connected to the measuring mechanism to pull the measuring mechanism, which is very time-consuming and labor-intensive. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by this utility model is to propose an acoustic Doppler flow velocity measuring device, which solves the problem that the existing acoustic Doppler flow velocity measuring device only has one lifting mechanism, which makes the traction of the measuring mechanism very time-consuming and labor-intensive after its failure.

[0005] The technical solution adopted by this utility model to solve its technical problem is an acoustic Doppler flow velocity measuring device, including a measuring mechanism for measuring water flow velocity, and the measuring device further includes:

[0006] A lifting support is provided, wherein a chain guide rail is provided on the lifting support, and a chain for traction measuring mechanism is provided inside the chain guide rail;

[0007] A first lifting mechanism is disposed above the lifting bracket. The first lifting mechanism includes: a driving member having an output shaft, a drum disposed on the output shaft, and a steel wire for pulling the measuring mechanism to lift and lower is wound on the drum.

[0008] The second lifting mechanism is disposed above the lifting bracket. The second lifting mechanism includes: a guide rail, which is arc-shaped and has an arc-shaped groove that runs through both ends of the guide rail; the chain can extend into one end of the arc-shaped groove and extend out from the other end of the arc-shaped groove; and a sprocket, which is fixed to one end of the output shaft and meshes with the chain.

[0009] Furthermore, it also includes a take-up mechanism for winding or releasing the cable on the measuring mechanism, the take-up mechanism comprising:

[0010] Rotatable take-up roller;

[0011] A guide roller is arranged parallel to the take-up roller, and a first guide groove and a second guide groove are provided on the guide roller. The first guide groove and the second guide groove are spirally arranged along the peripheral wall of the guide roller. The first guide groove has a first starting end and a first ending end that are opposite to each other, and the second guide groove has a second starting end and a second ending end that are opposite to each other. The first starting end is connected to the second ending end, and the second starting end is connected to the first ending end. A guide sleeve is sleeved on the guide roller and can rotate relative to the guide roller. The outer peripheral wall of the guide sleeve is provided with a guide portion for allowing the cable to pass around, and the inner peripheral wall of the guide sleeve is provided with a ball. The ball can at least partially extend into the first guide groove and the second guide groove and can slide along the first guide groove and the second guide groove.

[0012] Furthermore, the guide roller has a first end and a second end that are opposite to each other. The ball slides in the first guide groove to drive the guide sleeve to slide on the guide roller in the direction toward the first end, and the ball slides in the second guide groove to drive the guide sleeve to slide on the guide roller in the direction toward the second end.

[0013] Furthermore, it also includes a transmission mechanism, which includes a first gear fixed to the output shaft, a second gear meshing with the first gear, and a third gear meshing with the second gear, the third gear being fixed to the take-up roller;

[0014] The speed at which the take-up roller winds or releases the cable, the speed at which the drum winds or releases the wire, and the speed at which the chain pulls the measuring mechanism are all equal.

[0015] Furthermore, the drum includes a first wire section and a second wire section, with a first steel wire wound on the first wire section and a second steel wire connected to the second wire section, both the first and second steel wires being connected to the measuring mechanism;

[0016] The first steel wire is wound in the opposite direction to the second steel wire; the first steel wire is connected to the top of the measuring mechanism to apply an upward pulling force to the measuring mechanism; the second steel wire is connected to the bottom of the measuring mechanism to apply a downward pulling force to the measuring mechanism.

[0017] Furthermore, a fixed pulley is provided at the bottom of the measuring mechanism, and the second steel wire is wound around the fixed pulley.

[0018] Furthermore, a notch communicating with the arc-shaped groove is provided on the side wall of the guide rail, and the sprocket can at least partially extend into the notch and engage with the chain.

[0019] Furthermore, the guide rail is configured in a semi-circular annular structure;

[0020] One end of the guide rail is the starting end, and the other end is the ending end. The tangent direction of the chain at the starting end is parallel to the tangent direction of the chain at the ending end.

[0021] Furthermore, the lifting support includes:

[0022] A plurality of support units, wherein each support unit includes a plurality of longitudinal beams and a plurality of transverse beams, wherein the plurality of longitudinal beams are arranged in parallel and spaced apart, and a plurality of transverse beams are arranged between any two adjacent longitudinal beams, and the plurality of transverse beams are at the same height;

[0023] Multiple first connectors, each first connector having a first connecting portion and a second connecting portion fixed to each other, the first connecting portion being detachably connected to the outer side of the crossbeam, and the second connecting portion being detachably connected to both the outer side of the longitudinal beam and the outer side of another adjacent crossbeam.

[0024] A plurality of second connectors, each second connector having a third connector and a fourth connector fixed to each other, the third connector being detachably connected to the inner side of the crossbeam, and the fourth connector being detachably connected to the inner side of another adjacent crossbeam.

[0025] Furthermore, it also includes a third connector, which includes a fifth connector and a sixth connector. The fifth connector is connected to the longitudinal beam of one of the support units, and the sixth connector is connected to the longitudinal beam of another adjacent support unit.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] (1) A first lifting mechanism and a second lifting mechanism are provided, both driven by the same drive component, which reduces costs. When one lifting mechanism fails, it can be driven by the other lifting mechanism, thus avoiding the phenomenon that the measuring mechanism cannot be pulled due to the failure of the lifting mechanism.

[0028] (2) The chain passes through the arc-shaped groove at one end of the guide rail and exits at the other end of the guide rail, so as to suspend and guide the chain through the guide rail. At the same time, by opening a notch in the guide rail, the sprocket is inserted into the notch and meshes with the chain to realize the transmission of power. This avoids the chain being directly suspended on the sprocket. The sprocket does not need to bear the weight of the chain and the measuring mechanism. The longitudinal force on the sprocket is smaller and the service life is longer.

[0029] (3) The first steel wire is wound around the first coil of wire, and the second steel wire is wound around the second coil of wire, with the winding directions of the first and second steel wires being opposite. When the measuring mechanism is in its lowest position, both the first and second steel wires are taut. When the drive unit drives the output shaft to rotate forward, the second steel wire is released, and the first steel wire is wound around the first coil of wire, pulling the measuring mechanism upward. When the drive unit drives the output shaft to rotate in reverse, the first steel wire is released, and the second steel wire is wound around the second coil of wire, pulling the measuring mechanism upward. In other words, regardless of whether the drive unit rotates forward or in reverse, it can pull the measuring mechanism upward, thus avoiding the problem of not being able to detect and correct misoperation in time when the measuring mechanism needs to rise from underwater to surface, resulting in a lot of wasted time.

[0030] (4) By setting multiple first connectors on the outer surfaces of the crossbeams and longitudinal beams, and setting second connectors on the inner surfaces of two adjacent crossbeams, multiple longitudinal beams and multiple crossbeams can be detachably assembled together. In this way, the original on-site welding of the lifting support is replaced, and the problem of welding being impossible due to the lack of power supply at the construction site is solved.

[0031] (5) Both the first and second connecting parts can be detachably connected to the crossbeam and the longitudinal beam, so that the crossbeam and the longitudinal beam can be arbitrarily disassembled. When some parts are corroded or bent, the damaged parts can be removed and replaced separately without replacing the entire lifting bracket, thus reducing maintenance costs.

[0032] (6) The crossbeam and longitudinal beam are detachable. After the current position test is completed, the lifting bracket can be removed and transported to the next position for assembly and testing, so as to realize the reuse of the lifting bracket.

[0033] (7) The height of the lifting bracket is adjustable. The height of the lifting bracket can be adjusted according to the water depth at different locations to ensure that the lifting bracket can be used in different scenarios and is more flexible.

[0034] (8) When the take-up roller is driven to rotate and take up the cable, the cable is pulled and wound on the take-up roller. At the same time, when the cable is pulled, it can drive the guide sleeve to rotate. During the rotation, the guide sleeve drives the ball to slide on the first guide groove or the second guide groove, thereby driving the guide sleeve to slide along the length direction of the guide roller. This drives the cable to move along the length direction of the guide roller during the winding process, so as to evenly wind the cable onto the take-up roller, avoid the cable from accumulating in the same position on the take-up roller, and prevent the cable from being overstretched and breaking. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the first lifting mechanism, the second lifting mechanism, and the wire take-up mechanism in the embodiment;

[0036] Figure 2This is a schematic diagram of the structure of the first lifting mechanism in the embodiment;

[0037] Figure 3 This is a schematic diagram of the output shaft in the embodiment;

[0038] Figure 4 This is a schematic diagram of the structure of the roll in the embodiment;

[0039] Figure 5 This is a schematic diagram of the structure of the first lifting mechanism and the second lifting mechanism in the embodiment;

[0040] Figure 6 This is a schematic diagram of the structure of the second lifting mechanism in the embodiment;

[0041] Figure 7 This is a schematic diagram of the guide rail structure in the embodiment;

[0042] Figure 8 This is a schematic diagram of the take-up mechanism in the embodiment;

[0043] Figure 9 This is a schematic diagram of the guide roller structure in the embodiment;

[0044] Figure 10 This is a schematic diagram of the pressure plate structure in the embodiment;

[0045] Figure 11 This is a schematic diagram of the lifting bracket in the embodiment;

[0046] Figure 12 This is a schematic diagram of the structure of the first connector in the embodiment;

[0047] Figure 13 This is a schematic diagram of the structure of the second connector in the embodiment;

[0048] In the picture:

[0049] 100. First lifting mechanism; 110. Output shaft; 111. Limiting notch; 120. Drum; 121. First winding section; 122. Second winding section; 123. Center mounting hole; 124. Limiting protrusion; 130. Driving component;

[0050] 200. Second lifting mechanism; 210. Guide rail; 211. Arc groove; 212. Notch; 213. Sprocket;

[0051] 300. Take-up mechanism; 310. Take-up roller; 320. Pressure plate; 321. Connecting part; 322. Deformation part; 323. Wire pressing part; 324. Guide part; 330. Guide roller; 331. First guide groove; 332. Second guide groove; 340. Guide sleeve; 350. Conductive slip ring; 360. First gear; 370. Second gear; 380. Third gear;

[0052] 400. Mounting plate;

[0053] 500, Lifting bracket; 510, Crossbeam; 520, Longitudinal beam; 530, First connecting piece; 531, First connecting part; 532, Second connecting part; 533, First covering plate; 534, Second covering plate; 540, Second connecting piece; 541, Third connecting part; 542, Fourth connecting part; 550, Chain guide rail. Detailed Implementation

[0054] 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.

[0055] Please refer to Figures 1-13 This utility model discloses an acoustic Doppler flow velocity measuring device, including a measuring mechanism for measuring water flow velocity, and the measuring device further includes:

[0056] A lifting support 500 is provided, and a chain guide rail 550 is provided on the lifting support 500. A chain for traction measurement mechanism is provided inside the chain guide rail 550.

[0057] A first lifting mechanism 100 is disposed above the lifting bracket 500. The first lifting mechanism 100 includes a driving member 130, which has an output shaft 110. A drum 120 is disposed on the output shaft 110, and a steel wire for pulling the measuring mechanism to lift is wound on the drum 120.

[0058] The second lifting mechanism 200 is disposed above the lifting bracket 500. The second lifting mechanism 200 includes: a guide rail 210, which is arc-shaped and has an arc-shaped groove 211 that passes through both ends of the guide rail 210. The chain can extend into one end of the arc-shaped groove 211 and extend out from the other end of the arc-shaped groove 211; and a sprocket 213, which is fixed to one end of the output shaft 110 and meshes with the chain.

[0059] Specifically, this application includes both a first lifting mechanism 100 and a second lifting mechanism 200, both driven by the same drive unit 130, thus reducing costs. If one lifting mechanism malfunctions, the other can be used to drive it, thereby preventing the measuring mechanism from being unable to be pulled due to a damaged lifting mechanism.

[0060] Of course, during traction, the first lifting mechanism 100 and the second lifting mechanism 200 can simultaneously traction the measuring mechanism so that they can work at the same time, reduce the load on a single lifting mechanism, and extend its service life.

[0061] In the first lifting mechanism 100, one end of the steel wire is connected to the drum 120 and the other end is connected to the measuring mechanism. The driving component 130 drives the output shaft 110 to rotate, thereby rotating the drum 120 to wind the steel wire onto the drum 120 or release the steel wire from the drum 120, thus achieving traction on the measuring mechanism.

[0062] In the second lifting mechanism 200, a chain passes through the arc-shaped groove 211, with both ends of the chain extending from the ends of the guide rails 210 and connected to the measuring mechanism. When the drive unit 130 rotates, it drives the output shaft 110 to rotate, which in turn drives the sprocket 213 to rotate, ultimately causing the chain to pull the measuring mechanism along the height direction, thus achieving the lifting and lowering of the measuring mechanism. Specifically, the chain enters the arc-shaped groove 211 from one end of the guide rail 210 and exits from the other end of the guide rail 210, allowing the guide rail 210 to suspend and guide the chain.

[0063] Further, please refer to Figures 8-10 It also includes a take-up mechanism 300 for winding or releasing the cable on the measuring mechanism, the take-up mechanism 300 comprising:

[0064] Rotatable take-up roller 310;

[0065] A guide roller 330 is arranged parallel to the take-up roller 310. The guide roller 330 has a first guide groove 331 and a second guide groove 332, which are spirally arranged along the circumferential wall of the guide roller 330. The first guide groove 331 has a first starting end and a first ending end opposite to each other, and the second guide groove 332 has a second starting end and a second ending end opposite to each other. The first starting end is connected to the second ending end, and the second starting end is connected to the first ending end. A guide sleeve 340 is sleeved on the guide roller 330 and can rotate relative to the guide roller 330. The outer circumferential wall of the guide sleeve 340 has a guide portion for allowing the cable to pass around, and the inner circumferential wall of the guide sleeve 340 has a ball bearing. The ball bearing can at least partially extend into the first guide groove 331 and the second guide groove 332 and can slide along the first guide groove 331 and the second guide groove 332.

[0066] Specifically, when the take-up roller 310 is driven to rotate and take in the cable, the cable is pulled and wound onto the take-up roller 310. At the same time, when the cable is pulled, it can drive the guide sleeve 340 to rotate. During the rotation, the guide sleeve 340 drives the ball to slide on the first guide groove 331 or the second guide groove 332, thereby driving the guide sleeve 340 to slide along the length direction of the guide roller 330. This causes the cable to move along the length direction of the guide roller 330 during the winding process, so as to evenly wind the cable onto the take-up roller 310, avoid the cable accumulating in the same position on the take-up roller 310, and prevent the cable from being damaged or broken due to excessive force.

[0067] Simultaneously, since the first starting end of the first guide groove 331 is connected to the second ending end of the second guide groove 332, and the first ending end of the first guide groove 331 is connected to the second starting end of the second guide groove 332, when the guide sleeve 340 slides forward, the ball slides along the first guide groove 331 until it reaches the first ending end. Then, the guide sleeve 340 continues to rotate, causing the ball to slide from the first ending end to the second starting end. Then, it continues to slide along the second guide groove 332, driving the guide sleeve 340 to slide in the opposite direction along the guide roller 330 until the ball reaches the second ending end. The ball then continues to slide and from the second ending end to the first starting end. In this way, a single return slide of the guide sleeve 340 is completed, facilitating the uniform winding of the cable along the length of the take-up roller 310.

[0068] Furthermore, the sliding of the guide sleeve 340 along the guide roller 330 is achieved by the sliding of the balls along the first guide groove 331 and the second guide groove 332. The sliding of the balls is achieved by the rotation of the guide sleeve 340, which in turn is achieved by the movement of the cable during the winding process. In other words, the sliding of the guide sleeve 340 is powered by the movement of the cable during winding, eliminating the need for an additional power source for the guide sleeve 340 to slide, resulting in a more ingenious design.

[0069] Furthermore, the guide roller 330 has a first end and a second end that are opposite to each other. The ball slides in the first guide groove 331 to drive the guide sleeve 340 to slide on the guide roller 330 in the direction toward the first end. The ball slides in the second guide groove 332 to drive the guide sleeve 340 to slide on the guide roller 330 in the direction toward the second end.

[0070] Specifically, during cable winding, the cable always moves towards the take-up roller 310, and the direction in which the cable drives the guide sleeve 340 to rotate remains constant. When the balls inside the guide sleeve 340 slide in the first guide groove 331, the guide sleeve 340 slides forward along the length of the guide roller 330. When the inner roller of the guide sleeve 340 slides in the second guide groove 332, the guide sleeve 340 slides in the reverse direction along the length of the guide roller 330. The balls inside the guide sleeve 340 slide alternately in the first guide groove 331 and the second guide groove 332, realizing the reciprocating motion of the guide sleeve 340 along the length of the guide roller 330, thereby evenly distributing the cable along the length of the take-up roller 310.

[0071] It should be noted that when releasing the cable, the cable moves in the opposite direction, and the rotation of the guide sleeve 340 also reverses. Therefore, when the ball slides in the first guide groove 331, the guide sleeve 340 slides in the opposite direction along the length of the guide roller 330. When the ball slides in the second guide groove 332, the guide sleeve 340 slides in the forward direction along the length of the guide roller 330. This also enables the guide sleeve 340 to reciprocate, ensuring that it moves synchronously with the cable distribution on the take-up roller 310. This keeps the guide sleeve 340 always directly facing the released cable, preventing the cable from being scratched by excessive angles when passing through the guide sleeve 340.

[0072] Furthermore, the inner peripheral wall of the guide sleeve 340 is provided with an installation notch 212, and the ball can partially extend into the installation notch 212 to form a spherical pair with the installation notch 212.

[0073] Specifically, a spherical pair is formed between the ball and the mounting notch 212, allowing the ball to rotate in any direction at the mounting notch 212. This ensures that the ball can rotate along the tangential direction at any position of the first guide groove 331 and the second guide groove 332, thereby reducing the resistance when the ball rolls and making the rotation and sliding of the guide sleeve 340 smoother.

[0074] Furthermore, there is a smooth transition between the first starting end and the second ending end, and a smooth transition between the second starting end and the first ending end.

[0075] Specifically, the first starting end and the second ending end transition smoothly, and the second starting end and the first ending end transition smoothly. That is, the tangential direction of the first starting end and the second ending end changes relatively gently. This makes the ball experience less resistance when it slides from the second ending end to the first starting end, and from the first ending end to the second starting end, and the sliding process is smoother, making the guide sleeve 340 less prone to jamming.

[0076] Furthermore, a conductive slip ring 350 is fitted onto the take-up roller 310. The conductive slip ring 350 has an electrical contact portion, and one end of the cable can slide on the electrical contact portion and be electrically connected to the conductive slip ring 350.

[0077] Furthermore, the contact portion is disposed on the inner surface, outer surface, or end of the conductive slip ring 350.

[0078] Furthermore, the contact portion is an annular arc surface disposed on the inner surface, outer surface, or end of the conductive slip ring 350.

[0079] It should be noted that since the cable needs to be powered and communicate with external devices, it requires an external circuit, and the take-up roller 310 needs to rotate. Therefore, if the cable is directly connected to the external device, the connection point between the cable and the external device will continuously twist along with the take-up roller 310, making the connection point very easy to break.

[0080] Based on this, this application provides a conductive slip ring 350 on the take-up roller 310. The conductive slip ring 350 is electrically connected to an external device, so that one end of the cable contacts the contact part on the conductive slip ring 350. When the take-up roller 310 rotates, the conductive slip ring 350 does not rotate with it. The end of the cable slides continuously on the contact part, but always maintains contact, which can prevent the connection from twisting and breaking while ensuring the electrical connection between the cable and the external device.

[0081] Of course, the conductive slip ring 350 can also rotate with the take-up roller 310, and the cable can be fixedly connected to the conductive slip ring 350. At the same time, the external electrical terminal and the electrical part can slide to contact each other, so that the two can be electrically connected.

[0082] Furthermore, an mounting plate 400 is provided above the lifting bracket 500, and the first lifting mechanism 100, the second lifting mechanism 200, and the winding mechanism 300 are all mounted on the mounting plate 400; wherein, an outer shell is provided on the mounting plate 400, and two partitions are provided inside the outer shell, the two partitions dividing the space inside the outer shell into a first region, a second region, and a third region; a guide rail 210 and a drive component 130 are located in the first region, the winding mechanism 300 and the first lifting mechanism 100 are located in the second region, and the transmission mechanism and another guide rail 210 are located in the third region.

[0083] The take-up unit also includes a pressure plate 320, which is disposed on the side of the take-up roller 310 away from the guide roller 330, and the lower end of the pressure plate 320 is connected to the mounting plate 400.

[0084] The pressure plate 320 provides a force to tighten the cable. Specifically, as the cable passes through the pressure plate 320, the pressure plate 320 contacts the cable and pulls it taut to tightly wind the cable onto the take-up roller 310.

[0085] Furthermore, the pressure plate 320 has a connecting part 321 and a wire pressing part 323. The connecting part 321 is fixed to the mounting plate 400, and the wire pressing part 323 is used to abut against the cable.

[0086] A deformation portion 322 is also provided between the connecting portion 321 and the pressure line portion 323. The deformation portion 322 gradually bends away from the mounting plate 400 from the connecting portion 321 toward the pressure line portion 323.

[0087] Specifically, when the cable passes through the pressure plate 320, the pressure plate 320 is pressed against by the cable and the deformation part 322 is deformed. The force of this deformation also acts on the cable, causing the cable to be tightened.

[0088] Furthermore, the end of the pressing part 323 away from the deformation part 322 is also provided with a guide part 324, and the guide part 324 gradually tilts away from the guide roller 330 along the direction away from the deformation part 322.

[0089] The guide section 324 is provided so that the edge of the pressure plate 320 is inclined away from the cable, thereby preventing the relatively sharp cable edge from scratching the cable.

[0090] Furthermore, it also includes a transmission mechanism, which includes a first gear 360 fixedly connected to the output shaft 110, a second gear 370 meshing with the first gear 360, and a third gear 380 meshing with the second gear 370, wherein the third gear 380 is fixedly connected to the take-up roller 310.

[0091] The speed at which the take-up roller 310 winds or releases the cable, the speed at which the drum 120 winds or releases the wire, and the speed at which the chain pulls the measuring mechanism are all equal.

[0092] The take-up roller 310 is driven by a drive unit 130. The output shaft 110 of the drive unit 130 transmits power to the take-up roller 310 via a first gear 360, a second gear 370, and a third gear 380. A torque sensor is installed on the second gear 370 of the take-up roller 310. During the winding process, if the torque detected by the torque sensor exceeds a preset value, winding stops to prevent the take-up roller 310 from continuing to rotate and breaking the cable.

[0093] Further, please refer to Figures 2-4The drum 120 includes a first wire section 121 and a second wire section 122. A first steel wire is wound on the first wire section 121, and a second steel wire is connected to the second wire section 122. Both the first steel wire and the second steel wire are connected to the measuring mechanism.

[0094] The first steel wire is wound in the opposite direction to the second steel wire; the first steel wire is connected to the top of the measuring mechanism to apply an upward pulling force to the measuring mechanism; the second steel wire is connected to the bottom of the measuring mechanism to apply a downward pulling force to the measuring mechanism.

[0095] Specifically, a first steel wire is wound around a first coil of wire 121, and a second steel wire is wound around a second coil of wire 122, with the winding directions of the first and second steel wires opposite. When the drive unit 130 rotates clockwise, the first coil of wire 121 winds up the first steel wire, and the second coil of wire 122 releases the second steel wire, pulling the measuring mechanism upwards at a uniform speed via the first steel wire. When the drive unit 130 rotates counterclockwise, the second coil of wire 122 winds up the second steel wire, and the first coil of wire 121 releases the first steel wire, pulling the measuring mechanism downwards at a uniform speed via the second steel wire. This allows the measuring mechanism to descend at a uniform speed.

[0096] Meanwhile, since the second steel wire can pull the measuring mechanism downward, even if the metal slide rail on the lifting bracket is rusted and jammed, the second steel wire can provide a downward force and pull the measuring mechanism down, preventing the measuring mechanism from being unable to descend under its own gravity and from becoming stuck underwater.

[0097] It should be noted that the winding direction refers to the direction in which the steel wire spirals or wraps around the drum 120. When the first steel wire is wound clockwise on the drum 120, the second steel wire is wound counterclockwise; when the first steel wire is wound counterclockwise on the drum 120, the second steel wire is wound clockwise. The description of the forward and reverse rotation of the drive unit 130 is only to indicate two opposite directions of rotation and does not limit the specific direction of rotation to clockwise or counterclockwise.

[0098] Furthermore, a fixed pulley is provided at the bottom of the measuring mechanism, and the second steel wire is wound around the fixed pulley.

[0099] Specifically, the two ends of the second steel wire are connected to the second coiled wire segment and the bottom end of the measuring mechanism, respectively. The second steel wire is wound around a fixed pulley, and the traction direction of the second steel wire can be changed by the fixed pulley, so that it can pull the measuring mechanism downward.

[0100] Furthermore, the first steel wire has a first winding section wound around the first coiled section 121 and a first hanging section hanging down under its own weight; the second steel wire has a second winding section wound around the second coiled section 122 and a second hanging section hanging down under its own weight.

[0101] The first drop section and the second drop section are located on opposite sides of the drum 120.

[0102] It should be noted that the first and second drooping segments refer to the sections that can fall vertically under their own weight without being straightened by the measuring mechanism. They are only used to distinguish different segments and do not limit their posture during operation. For example, when the first steel wire is straightened, the first drooping segment is also straightened by the measuring mechanism, and its posture no longer hangs naturally due to its own weight.

[0103] Furthermore, a first partition and a third partition are respectively provided at both ends of the roll 120, and a second partition is provided between the first partition and the third partition;

[0104] The region on the drum 120 between the first partition and the second partition constitutes the first winding section 121, and the region on the drum 120 between the second partition and the third partition constitutes the second winding section 122.

[0105] Specifically, the first partition, the second partition, and the third partition are separators installed on the drum 120 to divide the area and separate the first steel wire and the second steel wire.

[0106] The first and third partitions are located at both ends of the drum 120 to prevent the first and second steel wires from crossing the ends of the drum 120 during winding, which could cause the measuring mechanism to fall off.

[0107] The second partition is disposed between the first partition and the second partition, and divides the drum 120 into a first wire section 121 and a second wire section 122, which can limit the first wire to the first wire section 121 and the second wire to the second wire section 122.

[0108] Furthermore, the first partition, the second partition, and the third partition are all provided with fixing holes for connecting the first steel wire or the second steel wire.

[0109] Specifically, fixing holes are made on the first partition, the second partition, and the third partition. After passing one end of the first steel wire and the second steel wire through the fixing holes, they are knotted or otherwise enlarged to prevent the first steel wire and the second steel wire from exiting the fixing holes, thereby fixing the first steel wire and the second steel wire to the drum 120.

[0110] Of course, the first filament section 121 and the second filament section 122 can be set as independent components. A second partition is set at the end of the first filament section 121 and a second partition is also set at the end of the second filament section 122. The two second partitions are connected and fixed by bolts through the fixing holes on the two second partitions to realize the connection between the first filament section 121 and the second filament section 122.

[0111] Furthermore, the peripheral wall of the drum 120 is recessed inward to form a constraint groove, into which the first steel wire and the second steel wire can at least partially extend.

[0112] Furthermore, the constraint groove is arranged in a spiral shape.

[0113] During the winding of steel wire on the drum 120, in order to ensure that the steel wire is wound evenly along the length of the drum 120, this application provides a spiral-shaped constraint groove on the peripheral wall of the drum 120. The steel wire can be partially embedded in the constraint groove, and the distribution of the steel wire is guided and constrained by the constraint groove.

[0114] Furthermore, the drum 120 has a central mounting hole 123, and a limiting protrusion 124 is provided on the inner wall of the central mounting hole 123;

[0115] The peripheral wall of the output shaft 110 is recessed inward to form a limiting notch 111, and the limiting protrusion 124 can extend into the limiting notch 111.

[0116] Specifically, the locking of the output shaft 110 and the drum 120 is achieved by the combination of the limiting notch 111 and the limiting protrusion 124. When the output shaft 110 is driven to rotate by the driving member 130, the limiting protrusion 124 on the output shaft 110 can press tightly against the side wall of the limiting notch 111 and drive the drum 120 to rotate together, preventing slippage between the drum 120 and the output shaft 110.

[0117] Furthermore, the limiting protrusion 124 and the limiting notch 111 are elongated, and the limiting protrusion 124 extends through both ends of the roll 120.

[0118] Specifically, the limiting protrusion 124 is set as a long strip that runs through both ends of the drum 120, so that the effective range of the limiting protrusion 124 covers the entire length of the drum 120, the locking force between the drum 120 and the output shaft 110 is greater, and the force on each position of the limiting protrusion 124 is more uniform.

[0119] Further, please refer to Figures 5-7 The guide rail 210 has a notch 212 on its side wall that communicates with the arc-shaped groove 211, and the sprocket 213 can at least partially extend into the notch 212 and engage with the chain.

[0120] By creating a notch 212 in the guide rail 210, the sprocket 213 is inserted into the notch 212 and engages with the chain to achieve power transmission. The advantage of this design is that it avoids the chain being directly suspended on the sprocket 213, the sprocket 213 does not need to bear the weight of the chain and the measuring mechanism, the longitudinal force on the sprocket 213 is smaller, and its service life is longer.

[0121] Furthermore, since this application has a notch 212 on the guide rail 210, the exposed chain at the notch 212 allows it to mesh with the sprocket 213, thus providing a more convenient meshing position. Without the need for multiple gears and drive shafts to change the direction of force, the sprocket 213 can be directly fixed to the output shaft 110 to mesh with the chain, simplifying the transmission structure, reducing costs, and improving transmission efficiency.

[0122] Furthermore, the guide rail 210 has inner and outer surfaces that are opposite to each other, as well as a first and second surface that are opposite to each other.

[0123] The notch 212 is formed by the outward indentation of the inner surface or the inward indentation of the outer surface.

[0124] Specifically, the guide rail 210 has an inner side and an outer side, and the notch 212 can be provided on the inner side or the outer side. The position of the notch 212 depends on the position of the chain relative to the guide rail 210.

[0125] Furthermore, the chain includes multiple chain plates and multiple pins, with the multiple chain plates connected by the pins;

[0126] The guide rail 210 is recessed from the second side towards the first side to form the arc-shaped groove 211. The arc-shaped groove 211 has a bottom surface, and the bottom surface is recessed towards the first side to form a first mounting groove. The pin can at least partially extend into the first mounting groove.

[0127] The chain includes chain plates and pins. The end of the pin protrudes from the chain plate and can extend into the first mounting groove. The first mounting groove limits the movement of the pin and thus constrains the chain.

[0128] Specifically, the bottom surface of the arc-shaped groove 211 is recessed towards the first side to form a first mounting groove. The portion of the pin protruding from the chain plate can extend into the first mounting groove and slide along it. This restrains the chain by limiting the end of the pin, preventing it from slipping out of the arc-shaped groove 211. Simultaneously, the restraint of the chain by the second mounting groove further stabilizes the chain's posture during traction measurement, allowing it to mesh tightly with the sprocket 213.

[0129] Furthermore, the arc-shaped groove 211 also includes two groove sidewalls, which are respectively connected to the two sides of the bottom surface of the groove. The groove sidewalls are recessed inward or outward to form a second mounting groove, and the chain plate can extend at least partially into the second mounting groove.

[0130] Specifically, the inner sidewall of the groove is recessed inward to form a second mounting groove, and the outer sidewall of the groove is recessed outward to form a second mounting groove. The two second mounting grooves are arranged opposite each other, and the two sides of the chain plate partially extend into the two second mounting grooves. In this way, the chain plate is limited by the second mounting grooves, thereby constraining the chain and preventing the chain from shaking when pulling the measuring mechanism.

[0131] Furthermore, the notch 212 penetrates both sidewalls of the groove, and the notch 212 is semi-circular.

[0132] Specifically, since the notch 212 penetrates the inner and outer sidewalls of the groove, there is a larger space at the notch 212 to accommodate the sprocket 213, and the sprocket 213 can extend into the notch 212 to a greater extent, so that it can mesh tightly with the chain.

[0133] Furthermore, the second side is located on the side of the guide rail 210 facing the drive member 130.

[0134] Specifically, the second side is located inside the guide rail 210 (i.e., the side facing the drive member 130), and the opening of the arc-shaped groove 211 is also located inside the guide rail 210. The advantage of this arrangement is that, since the inner side of the guide rail 210 has the output shaft 110, even if the chain disengages from the arc-shaped groove 211 from the opening, the chain can fall onto the output shaft 110, thereby holding the measuring mechanism and preventing it from falling further, thus providing secondary protection.

[0135] Furthermore, the guide rail 210 is configured in a semi-circular annular structure;

[0136] One end of the guide rail 210 is the starting end, and the other end is the ending end. The tangent direction of the chain at the starting end is parallel to the tangent direction of the chain at the ending end.

[0137] Specifically, the guide rail 210 has a semi-circular ring structure, making the chains at both ends of the guide rail 210 parallel in direction. That is, the chain at the beginning moves upward and the chain at the end moves downward. In this way, the chains at the beginning and end can hang down naturally, avoiding large interference between the chain and the end of the guide rail 210, and preventing damage to the chain due to excessive friction between the chain and the end of the guide rail 210.

[0138] Further, please refer to Figures 11-13 The lifting support 500 includes:

[0139] A plurality of support units, wherein the support unit includes a plurality of longitudinal beams 520 and a plurality of transverse beams 510, wherein the plurality of longitudinal beams 520 are arranged in parallel and spaced apart, and a plurality of transverse beams 510 are arranged between any two adjacent longitudinal beams 520, and the plurality of transverse beams 510 are at the same height.

[0140] Multiple first connectors 530, each first connector 530 having a first connecting portion 531 and a second connecting portion 532 fixed to each other, the first connecting portion 531 being detachably connected to the outer side of the crossbeam 510, and the second connecting portion 532 being detachably connected to both the outer side of the longitudinal beam 520 and the outer side of another adjacent crossbeam 510.

[0141] A plurality of second connectors 540, each second connector 540 having a third connecting portion 541 and a fourth connecting portion 542 fixed to each other, the third connecting portion 541 being detachably connected to the inner side of the crossbeam 510, and the fourth connecting portion 542 being detachably connected to the inner side of another adjacent crossbeam 510.

[0142] Specifically, in this application, multiple first connectors 530 are provided on the outer surfaces of the crossbeams 510 and longitudinal beams 520, and second connectors 540 are provided on the inner surfaces of two adjacent crossbeams 510, so that the multiple longitudinal beams 520 and multiple crossbeams 510 can be detachably assembled together. This replaces the original solution of welding the lifting support 500 on-site, solving the problem of welding being impossible due to the lack of power supply at the construction site.

[0143] Meanwhile, since both the first connector 530 and the second connector 540 can be detachably connected to the crossbeam 510 and the longitudinal beam 520, the crossbeam 510 and the longitudinal beam 520 can be arbitrarily disassembled. When some parts are corroded or bent, the damaged parts can be removed and replaced separately without replacing the entire lifting bracket 500, resulting in lower maintenance costs.

[0144] It should be noted that the detachability between the crossbeam 510 and the longitudinal beam 520 is achieved through the first connector 530 and the second connector 540. The first connector 530 and the second connector 540 can be connected to the crossbeam 510 and the longitudinal beam 520 by means of bolts, screws, clips, etc.

[0145] Furthermore, since the crossbeam 510 and the longitudinal beam 520 are detachable, after the test at the current position is completed, the lifting bracket 500 can be removed and transported to the next position for assembly and testing, thus realizing the reuse of the lifting bracket 500.

[0146] Furthermore, a first covering plate 533 and a second covering plate 534 are respectively provided on both sides of the first connecting portion 531 and the second connecting portion 532. The first covering plate 533 is connected to the upper side of the crossbeam 510, and the second covering plate 534 is connected to the lower side of the crossbeam 510. That is, the first connecting member 530, the first covering plate 533, the second covering plate 534, and the second connecting member 540 can be connected to the four sides of the crossbeam 510 respectively and fixed to the longitudinal beam 520, making the structure between the crossbeam 510 and the longitudinal beam 520 more stable.

[0147] Furthermore, the first connecting part 531, the second connecting part 532, the third connecting part 541 and the fourth connecting part 542 are all provided with a first fixing hole for connecting with the crossbeam 510;

[0148] The second connecting part 532 has a second fixing hole for connecting with the longitudinal beam 520.

[0149] Furthermore, connection holes are provided on the crossbeam 510 and the longitudinal beam 520;

[0150] The first fixing hole and the second fixing hole are threaded holes or through holes. The first connecting member 530 is connected to the crossbeam 510 / the longitudinal beam 520 by screws, and the second connecting member 540 is connected to the crossbeam 510 by screws.

[0151] Specifically, both the first and second fixing holes are threaded holes, and a detachable connection can be achieved by screwing the screw into the first or second fixing hole and passing it through the connecting hole.

[0152] Of course, the first and second fixing holes can also be set as through holes. Nuts are riveted on both the first and second connectors. A detachable connection can be achieved by screwing the screw into the nut and passing it through the first or second fixing hole.

[0153] Furthermore, both the longitudinal beam 520 and the transverse beam 510 are arranged in the form of a cuboid. The longitudinal beam 520 has a first surface and a second surface on the outer side, and a third surface and a fourth surface on the inner side.

[0154] The first connecting part 531 is simultaneously attached to the first surface and the outer side of the crossbeam 510, and the second connecting part 532 is simultaneously attached to the second surface and the outer side of another adjacent crossbeam 510; the third surface and the fourth surface are respectively connected to two adjacent crossbeams 510.

[0155] Specifically, the first connecting part 531 is attached to the first surface and the outer side of the crossbeam 510, and the second connecting part 532 is attached to the second surface and the outer side of another adjacent crossbeam 510. This can increase the contact area between the first connecting part 530 and the crossbeam 510 and the longitudinal beam 520, thereby enhancing the stability of the lifting bracket 500 structure and improving its strength.

[0156] Furthermore, four longitudinal beams 520 are provided in the same support unit, and four transverse beams 510 are provided at the same height, with any two adjacent transverse beams 510 being perpendicular to each other.

[0157] Furthermore, the first connecting portion 531 is perpendicular to the second connecting portion 532, and the third connecting portion 541 is perpendicular to the fourth connecting portion 542.

[0158] Furthermore, the upper surfaces of the uppermost plurality of crossbeams 510 are flush with the upper end face of the longitudinal beam 520, so that the upper surfaces of the crossbeams 510 and the upper end face of the longitudinal beam 520 form a mounting surface for mounting the drive mechanism.

[0159] Specifically, the uppermost horizontal beam 510 and the upper end of the vertical beam 520 are at the same height, and their upper surfaces are flush, forming a flat surface. This flat surface can be used to install the drive mechanism, which is the mounting surface of the drive mechanism, so that the drive mechanism can be horizontally arranged above the lifting bracket 500.

[0160] Furthermore, the height of the lowermost plurality of crossbeams 510 is higher than the lower end of the longitudinal beam 520.

[0161] The bottommost crossbeam 510 is higher than the bottom of the longitudinal beam 520, so that the bottom of the entire lifting support 500 only has the bottom ends of the four longitudinal beams 520, so that it can be placed on the uneven bottom surface and prevent the crossbeam 510 from interfering with the bottom surface, causing the bottom ends of the longitudinal beams 520 to be suspended and unable to bear the force.

[0162] Furthermore, it also includes a third connector, which includes a fifth connector 321 and a sixth connector 321. The fifth connector 321 is connected to the longitudinal beam 520 of one of the support units, and the sixth connector 321 is connected to the longitudinal beam 520 of another adjacent support unit.

[0163] The height of the support unit in this application is adjustable. Specifically, the height of the entire lifting support 500 can be increased by adding another support unit to the existing support unit. The two support units are connected by a third connector, that is, the fifth connecting part 321 of the third connector is connected to the longitudinal beam 520 of one of the support units, and the sixth connecting part 321 is connected to the longitudinal beam 520 of the other support unit.

[0164] Therefore, when the lifting bracket 500 is moved to different locations for testing, the height of the lifting bracket 500 can be adjusted according to the water depth at different locations, ensuring that the lifting bracket 500 can be used in different scenarios and is more flexible.

[0165] It should be noted that the connection method of the third connector is the same as that of the first connector 530 / second connector 540.

[0166] Furthermore, it also includes a fourth connector, which includes the first connector 531 and the second connector 532, and a sixth connector 321 is provided above the first connector 531 and the second connector 532 respectively.

[0167] Specifically, when multiple lifting supports 500 need to be connected, the first connection point is removed, and the third connector is replaced with a fourth connector. The fourth connector connects the horizontal and vertical beams 520 within the same support unit, as well as the vertical beams 520 between different support units. That is, the fourth connector simultaneously achieves the functions of the third connector and the first connector 530, making it more practical.

[0168] Furthermore, solar panels, radar level gauges, and equipment boxes can be installed at the crossbeam 510, making it more expandable.

[0169] It should be noted that since the outer shell of the measuring mechanism is made of plastic, during the dry season or when the water level is low, the measuring mechanism is directly exposed to the water surface, and long-term exposure to the sun can easily cause the outer shell to become brittle or even crack.

[0170] Based on this, this application provides a protective cover on the lifting support 500. During the dry season or when the water level is low, the measuring mechanism can be raised to be hidden inside the protective cover and its power supply can be cut off, thereby protecting the measuring mechanism.

[0171] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0172] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0173] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0174] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A device for measuring acoustic Doppler flow velocity, comprising a measuring mechanism for measuring the flow velocity of water, characterized in that, The measuring device further includes: A lifting support is provided, wherein a chain guide rail is provided on the lifting support, and a chain for traction measuring mechanism is provided inside the chain guide rail; A first lifting mechanism is disposed above the lifting bracket. The first lifting mechanism includes: a driving member having an output shaft, a drum disposed on the output shaft, and a steel wire for pulling the measuring mechanism to lift and lower is wound on the drum. The second lifting mechanism is disposed above the lifting bracket. The second lifting mechanism includes: a guide rail, which is arc-shaped and has an arc-shaped groove that runs through both ends of the guide rail; the chain can extend into one end of the arc-shaped groove and extend out from the other end of the arc-shaped groove; and a sprocket, which is fixed to one end of the output shaft and meshes with the chain.

2. The acoustic Doppler flow velocity measuring device according to claim 1, characterized in that, It also includes a take-up mechanism for winding up or releasing the cable on the measuring mechanism, the take-up mechanism comprising: Rotatable take-up roller; A guide roller is arranged parallel to the take-up roller, and a first guide groove and a second guide groove are provided on the guide roller. The first guide groove and the second guide groove are spirally arranged along the peripheral wall of the guide roller. The first guide groove has a first starting end and a first ending end that are opposite to each other, and the second guide groove has a second starting end and a second ending end that are opposite to each other. The first starting end is connected to the second ending end, and the second starting end is connected to the first ending end. A guide sleeve is sleeved on the guide roller and can rotate relative to the guide roller. The outer peripheral wall of the guide sleeve is provided with a guide portion for allowing the cable to pass around, and the inner peripheral wall of the guide sleeve is provided with a ball. The ball can at least partially extend into the first guide groove and the second guide groove and can slide along the first guide groove and the second guide groove.

3. The acoustic Doppler flow velocity measuring device according to claim 2, characterized in that, The guide roller has a first end and a second end that are opposite to each other. The ball slides in the first guide groove to drive the guide sleeve to slide on the guide roller in the direction toward the first end. The ball slides in the second guide groove to drive the guide sleeve to slide on the guide roller in the direction toward the second end.

4. The acoustic Doppler flow velocity measuring device according to claim 2, characterized in that, It also includes a transmission mechanism, which includes a first gear fixed to the output shaft, a second gear meshing with the first gear, and a third gear meshing with the second gear, the third gear being fixed to the take-up roller; The speed at which the take-up roller winds or releases the cable, the speed at which the drum winds or releases the wire, and the speed at which the chain pulls the measuring mechanism are all equal.

5. The acoustic Doppler flow velocity measuring device according to claim 1, characterized in that, The drum includes a first wire section and a second wire section, with a first steel wire wound on the first wire section and a second steel wire connected to the second wire section. Both the first steel wire and the second steel wire are connected to the measuring mechanism. The first steel wire is wound in the opposite direction to the second steel wire; the first steel wire is connected to the top of the measuring mechanism to apply an upward pulling force to the measuring mechanism; the second steel wire is connected to the bottom of the measuring mechanism to apply a downward pulling force to the measuring mechanism.

6. The acoustic Doppler flow velocity measuring device according to claim 5, characterized in that, A fixed pulley is also provided at the bottom of the measuring mechanism, and the second steel wire is wound around the fixed pulley.

7. The acoustic Doppler flow velocity measuring device according to claim 1, characterized in that, A notch communicating with the arc-shaped groove is provided on the side wall of the guide rail, and the sprocket can at least partially extend into the notch and engage with the chain.

8. The acoustic Doppler flow velocity measuring device according to claim 1, characterized in that, The guide rail is configured in a semi-circular ring structure; One end of the guide rail is the starting end, and the other end is the ending end. The tangent direction of the chain at the starting end is parallel to the tangent direction of the chain at the ending end.

9. A device for measuring acoustic Doppler flow velocity according to claim 1, characterized in that, The lifting support includes: A plurality of support units, wherein each support unit includes a plurality of longitudinal beams and a plurality of transverse beams, wherein the plurality of longitudinal beams are arranged in parallel and spaced apart, and a plurality of transverse beams are arranged between any two adjacent longitudinal beams, and the plurality of transverse beams are at the same height; Multiple first connectors, each first connector having a first connecting portion and a second connecting portion fixed to each other, the first connecting portion being detachably connected to the outer side of the crossbeam, and the second connecting portion being detachably connected to both the outer side of the longitudinal beam and the outer side of another adjacent crossbeam. A plurality of second connectors, each second connector having a third connector and a fourth connector fixed to each other, the third connector being detachably connected to the inner side of the crossbeam, and the fourth connector being detachably connected to the inner side of another adjacent crossbeam.

10. A device for measuring acoustic Doppler flow velocity according to claim 9, characterized in that, It also includes a third connector, which includes a fifth connector and a sixth connector. The fifth connector is connected to the longitudinal beam of one of the support units, and the sixth connector is connected to the longitudinal beam of another adjacent support unit.

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