Automatic weighing device for pressure vessel to prevent long-term pressure of weighbridge

Abstract

The utility model provides a kind of pressure vessel automatic weighing device of preventing weighbridge long-term pressure, including weighing device, support, jacking mechanism, slewing mechanism and rotary disc;Rotary disc is located at support mesa top end, pressure vessel bottom is equipped with connecting assembly, connecting assembly outside has fixed block;Jacking mechanism and slewing mechanism are installed below support mesa, jacking mechanism and slewing mechanism cooperate with each other to switch the position of supporting boss;When not weighing, fixed block is attached on supporting boss;When weighing, slewing mechanism drives rotary disc to rotate, so that fixed block and supporting boss are staggered, to make connecting assembly contact with weighing device.Pressure vessel can fall on rotary disc and support when not weighing, to avoid that pressure vessel is long-term pressed on weighing device, cause to appear weighing accuracy to drop etc.Problem.In addition, through the separable design of pressure vessel and weighing device, the weighing device can be periodically calibrated traceability, to guarantee the accuracy and reliability of weighing.

Description

Technical Field

[0001] This utility model relates to the field of pressure vessel weighing technology, and in particular to an automatic weighing device for pressure vessels that prevents the weighbridge from being subjected to long-term pressure. Background Technology

[0002] In my country, over 90% of stationary pressure vessels (such as LNG storage tanks, medical liquid oxygen tanks, and acetylene cylinders) primarily use traditional flowmeter methods for gas metering during filling and storage. Specifically, this involves monitoring the amount of gas filled into the tank or the remaining gas volume within the tank using gas pressure metering. For gas used in trade settlements, the mass of the gas entering the storage tank is determined by the mass difference between the gas tanker truck before and after filling. The specific procedure is as follows: when transporting gas to the customer's company, the gas tanker truck must first weigh the gas at a third-party weighbridge, then proceed to the customer's company to complete the gas delivery, and finally weigh the gas again at the third-party weighbridge after delivery. The volume of gas delivered is calculated based on the mass difference between the two weighings. However, this method has several drawbacks: First, it is time-consuming. The gas tanker truck needs to make multiple trips between the weighbridge and the customer's company, increasing transportation time and costs, especially when the transportation distance is long or the customer's company is concentrated, where the inefficiency is more pronounced. Second, the accuracy of the two weighings is difficult to guarantee. Weighbridge weighing is affected by various factors, such as ambient temperature, humidity, and the parking location of gas tankers, which may lead to errors in the weighing results. In addition, gas tankers may experience gas leaks or pressure changes during transportation and delivery due to factors such as vibration and temperature variations, further affecting the accuracy of the weighing.

[0003] Meanwhile, during the filling process, the gas pressure inside the tank is monitored using a pressure gauge. If the pressure gauge reading is inaccurate, the measurement deviation may lead to overfilling, posing a potential threat to equipment safety.

[0004] In the domestic gas transfer field, an innovative weighing method has been developed, which involves directly installing the weighing device at the bottom of the gas tank. This method can directly measure the mass difference before and after filling during the gas transfer process, thereby obtaining the gas transfer volume in real time. Compared with the traditional weighbridge method, this method eliminates the need for multiple weighing trips, greatly improving work efficiency. However, this direct weighing method also has some problems. Since the gas tanks are quite heavy, often exceeding 10 tons when fully filled, constantly pressing the tank against the weighing device will put significant pressure on the equipment, leading to damage or decreased weighing accuracy. Furthermore, under long-term high-load operation, the weighing device may experience fatigue damage or sensor drift, affecting the accuracy and reliability of the weighing. Because the weighbridge is fixedly installed at the bottom of the gas tank, it cannot be removed for periodic traceability, compromising the accuracy of the weighbridge. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an automatic weighing device for pressure vessels that is protected from long-term pressure on the weighbridge, which can solve the problem of decreased accuracy caused by long-term pressure on the weighing device; and can also solve the problem of difficulty in tracing the weighing device.

[0006] This utility model is implemented as follows:

[0007] This utility model provides an automatic weighing device for pressure vessels that is protected from long-term pressure on the weighbridge. It includes a weighing device and further includes: a bracket with a support platform, a lifting mechanism, a rotating mechanism and a rotating disk.

[0008] The rotating disk is rotatably connected to the top of the support platform. The top of the rotating disk is provided with several support bosses. The bottom of the pressure vessel is provided with a connecting component. The outside of the connecting component has several fixing blocks corresponding to the support bosses.

[0009] The lifting mechanism is installed below the support platform and is used to drive the pressure vessel to rise and fall.

[0010] The rotary mechanism is installed below the support platform and connected to the rotary disk. It is used to drive the rotary disk to rotate and cooperate with the lifting mechanism to switch the position of the support boss.

[0011] When not weighing, the fixing block is locked onto the support boss, thus separating the connecting assembly from the weighing device;

[0012] During weighing, the rotary mechanism drives the rotating disk to rotate, causing the fixed block to be misaligned with the support boss, so that the connecting assembly comes into contact with the weighing device.

[0013] Furthermore, the lifting mechanism is movably installed below the support platform, the weighing device is a weighbridge, the weighbridge is installed below the lifting mechanism, the connecting assembly includes a connecting plate and a support column, the connecting plate is fixed to the bottom of the pressure vessel, the support column is installed at the bottom of the connecting plate, the support column passes through the rotating disk and the support platform, and extends to a position close to the weighbridge; and when not weighing, the distance between the support column and the top of the weighbridge is less than the thickness of the support boss.

[0014] Furthermore, the bottom of the lifting mechanism is provided with rollers or slide rails.

[0015] Furthermore, an electronic level is provided on the top of the connecting plate.

[0016] Furthermore, the lifting mechanism is a screw jack, and when the pressure vessel is driven to rise, the support rod of the screw jack passes through the support platform and the rotating disk and contacts the connecting assembly.

[0017] Furthermore, a displacement sensor is installed on the upper end of the support rod of the screw jack.

[0018] The advantages of this invention are as follows: the coordinated movement of the rotating disc and the lifting mechanism allows the pressure vessel to rest on the weighing device during weighing, ensuring the safety of the pressure vessel filling process; when not weighing, the pressure vessel can rest on the rotating disc and support, preventing the pressure vessel from being pressed against the weighing device for extended periods, which could lead to decreased weighing accuracy. Furthermore, the separable design of the pressure vessel and the weighing device allows for periodic calibration and traceability of the weighing device, solving the problem of fatigue damage or sensor drift that may occur under long-term high-load operation, thus ensuring the accuracy and reliability of weighing. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of an automatic weighing device for pressure vessels that is protected from long-term pressure during weighing, as described in this utility model. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the structure of an automatic weighing device for pressure vessels that is protected from long-term pressure during weighing, as described in this utility model. Figure 2 .

[0022] Figure 3 for Figure 1 Exploded view of the structure shown.

[0023] Figure 4 This is a schematic diagram of the connecting plate structure in this utility model.

[0024] Figure 5 This is a schematic diagram of the rotating disk structure in this utility model.

[0025] Explanation of the labels in the diagram:

[0026] 1. Pressure vessel; 2. Weighbridge; 3. Bracket; 31. Support platform; 4. Lifting mechanism; 5. Rotation mechanism; 6. Rotary disc; 61. Support boss; 7. Fixing block; 8. Connecting plate; 9. Support column; 10. Roller; 11. First arc groove; 12. Second arc groove; 13. Bearing. Detailed Implementation

[0027] Example 1, please refer to Figures 1 to 5 This utility model provides an automatic weighing device for pressure vessels that prevents weighbridges from being subjected to long-term pressure. It includes a weighing device and further includes: a support 3 with a support platform 31, a lifting mechanism 4, a rotating mechanism 5, and a rotating disk 6. In this embodiment, the pressure vessel 1 is a gas storage tank or a liquid storage tank. The support 3 is set on the ground.

[0028] The rotating disk 6 is rotatably connected to the top of the support platform 31. A bearing 13 is provided between the rotating disk 6 and the support platform 31. Several support protrusions 61 are provided on the top of the rotating disk 6. The several support protrusions 61 are arranged in a circular array on the top of the rotating disk 6 with the axis of the rotating disk 6 as the center. A connecting assembly is provided at the bottom of the pressure vessel 1. Several fixing blocks 7 corresponding to the support protrusions 61 are provided on the outside of the connecting assembly.

[0029] The lifting mechanism 4 is installed below the support platform 31 and is used to drive the pressure vessel 1 to rise and fall.

[0030] The rotary mechanism 5 is installed below the support platform 31 and connected to the rotating disk 6. It is used to drive the rotating disk 6 to rotate and cooperate with the lifting mechanism 4 to switch the position of the support boss 61. The rotary mechanism 5 is a turntable, which is driven by a motor to rotate, thereby driving the rotating disk 6 to rotate.

[0031] When not weighing, the fixing block 7 is locked onto the support boss 61, thus separating the connecting assembly from the weighing device;

[0032] During weighing, the rotary mechanism 5 drives the rotating disk 6 to rotate, causing the fixed block 7 to be misaligned from the support boss 61, so that the connecting component comes into contact with the weighing device.

[0033] Specifically, the lifting mechanism 4 is movably installed below the support platform 31, and the weighing device is a weighbridge 2, which is installed below the lifting mechanism 4; more specifically, there is an installation space on the foundation, and the weighbridge 2 is installed within the installation space. When calibrating the weighbridge 2, the lifting mechanism 4 can be pushed out from under the support to meet the requirements for periodic calibration of the weighbridge 2.

[0034] The connecting assembly includes a connecting plate 8 and a support column 9. The fixing block 7 and the connecting plate 8 are an integral structure. The connecting plate 8 is fixed to the bottom of the pressure vessel 1. The support column 9 is installed at the bottom of the connecting plate 8. The support column 9 passes through the rotating disk 6 and the support platform 31 and extends to a position close to the weighbridge 2. When not weighing, there is a gap between the support column 9 and the top of the weighbridge 2.

[0035] The distance between the support column 9 and the top of the weighbridge 2 is less than the thickness of the support boss 61.

[0036] Specifically, the bottom of the lifting mechanism 4 is provided with rollers 10 or slide rails.

[0037] Specifically, an electronic level is provided on the top of the connecting plate 8.

[0038] Specifically, the lifting mechanism 4 is a screw jack. When driving the pressure vessel 1 to rise, the support rod of the screw jack passes through the support platform 31 and the rotating disk 6 to contact the connecting assembly. The rotating disk 6 is provided with a first arc-shaped groove 11 and a second arc-shaped groove 12. The support platform 31 is provided with a first through hole (not shown) and a second through hole (not shown). The support rod of the screw jack passes through the first through hole and the first arc-shaped groove 11 to contact the bottom of the connecting plate 8. The support column 9 passes through the second arc-shaped groove 12 and the second through hole, extending to a position close to the weighbridge 2.

[0039] Specifically, a displacement sensor is installed on the upper end of the support rod of the screw jack. Four screw jacks are provided, one of which is connected to a motor, and adjacent screw jacks are connected by a connecting rod to ensure synchronous movement of all four. A high-precision displacement sensor (not shown in the figure) is installed on the upper end of the support rod of each screw jack. The displacement sensor is used to display and monitor the lifting height of the lifting point of each lifting mechanism in real time, thereby determining the horizontal status of the pressure vessel during the lifting process.

[0040] One specific application of this embodiment is:

[0041] When not filled, the fixing block 7 is locked to the top of the support boss 61. At this time, there is a gap between the bottom of the support column 9 and the top of the weighbridge 2, and the size of this gap is smaller than the thickness of the support boss 61.

[0042] Before filling with gas (or liquid), the control system controls the support rod of the lifting mechanism 4 to smoothly lift the pressure vessel 1 until it is disengaged from the support boss 61. Then, the rotary mechanism 5 drives the rotating disk 6 to rotate to the set position. At this time, the fixing block 7 is misaligned with the support boss 61. Subsequently, the control system controls the lifting mechanism 4 to fall back to the designated position, so that the support column 9 presses down on the weighbridge 2.

[0043] At this time, the weighbridge 2 is started to collect data and record the current weight of the pressure vessel 1; after the pressure vessel 1 is filled with gas (or liquid), the weight of the pressure vessel 1 after filling is recorded. By calculating the difference in mass before and after filling, the mass of the filled gas is accurately obtained.

[0044] After weighing, the support rod of the lifting mechanism 4 smoothly raises the gas cylinder to the set position (disconnecting it from the weighbridge 2). Subsequently, the rotary mechanism 5 rotates the rotating disk 6 above the support boss 61. After the lifting mechanism 4 descends to the designated position, the fixing block 7 reconnects to the support boss 61. The weight of the pressure vessel 1 is borne by the rotating disk 6 and the bracket 3 to prevent the pressure vessel 1 from being pressed on the weighbridge 2 for a long time, which could cause problems such as decreased weighing accuracy.

[0045] The movable lifting mechanism 4 can meet the needs of periodic calibration of the weighbridge 2, and solve the problems that may occur due to fatigue damage or sensor drift under long-term high-load operation of the weighbridge 2, thus ensuring the accuracy and reliability of weighing.

[0046] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An automatic weighing device for pressure vessels designed to withstand long-term pressure, comprising a weighing device, characterized in that: Also includes: It has a support frame, a lifting mechanism, a rotation mechanism, and a rotating disk; The rotating disk is rotatably connected to the top of the support platform. The top of the rotating disk is provided with several support bosses. The bottom of the pressure vessel is provided with a connecting component. The outside of the connecting component has several fixing blocks corresponding to the support bosses. The lifting mechanism is installed below the support platform and is used to drive the pressure vessel to rise and fall. The rotary mechanism is installed below the support platform and connected to the rotary disk. It is used to drive the rotary disk to rotate and cooperate with the lifting mechanism to switch the position of the support boss. When not weighing, the fixing block is locked onto the support boss, thus separating the connecting assembly from the weighing device; During weighing, the rotary mechanism drives the rotating disk to rotate, causing the fixed block to be misaligned with the support boss, so that the connecting assembly comes into contact with the weighing device.

2. The automatic weighing device for pressure vessels designed to withstand long-term pressure as described in claim 1, characterized in that: The lifting mechanism is movably installed below the support platform. The weighing device is a weighbridge, which is installed below the lifting mechanism. The connecting assembly includes a connecting plate and a support column. The connecting plate is fixed to the bottom of the pressure vessel, and the support column is installed at the bottom of the connecting plate. The support column passes through the rotating disk and the support platform, extending to a position close to the weighbridge. When not weighing, the distance between the support column and the top of the weighbridge is less than the thickness of the support boss.

3. The automatic weighing device for pressure vessels designed to withstand long-term pressure as described in claim 2, characterized in that: The bottom of the lifting mechanism is equipped with rollers or slide rails.

4. The automatic weighing device for pressure vessels designed to withstand long-term pressure as described in claim 2, characterized in that: An electronic level is installed on the top of the connecting plate.

5. The automatic weighing device for pressure vessels designed to withstand long-term pressure as described in claim 1, characterized in that: The lifting mechanism is a screw jack. When the pressure vessel is driven to rise, the support rod of the screw jack passes through the support platform and the rotating disk and contacts the connecting assembly.

6. The automatic weighing device for pressure vessels designed to withstand long-term pressure as described in claim 5, characterized in that: A displacement sensor is installed on the upper end of the support rod of the screw jack.

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