Chain transmission online target flowmeter

Abstract

The utility model belongs to the technical field of flow meters, and particularly relates to a chain transmission online target type flow meter which comprises a meter head and a lifting mechanism, a sliding pipe, a sensor and a measuring head are arranged below the meter head, a positioning pipe is arranged outside the sliding pipe, and the lifting mechanism is used for driving the sliding pipe to slide up and down in the positioning pipe. The lifting mechanism comprises an upper connecting plate and a lower connecting plate which are fixed to the upper ends of the sliding pipe and the positioning pipe, the upper connecting plate is provided with two symmetrical lead screws, the lead screws are in threaded fit with lead screw nuts, and the lead screw nuts are rotatably installed on the lower connecting plate. A chain wheel transmission part is arranged between the upper connecting plate and the lower connecting plate and comprises a driving wheel, two driven wheels and a transmission chain, the transmission chain is meshed with the driving wheel and the two driven wheels, a driving shaft used for driving the driving wheel to rotate is arranged on the driving wheel, and the driven wheels are fixed to the upper end of the lead screw nut; the problems that an existing online plug-in flow meter is troublesome in operation, and single-side thread seizure and stroke deviation are prone to occurring in the lifting process are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flow meters, and particularly relates to a chain drive online target flow meter. Background Art

[0002] A target flow meter is a flow measurement instrument with high precision, strong stability and easy maintenance, and is widely used in multiple industrial fields; for the detection of large-diameter flow, an insertion-type target flow meter is usually adopted, and an online plug-and-play target flow meter is derived for the convenience of maintenance and operation.

[0003] Existing online plug-and-play target flow meters usually adopt a body screw rod structure or a single-side screw rod structure to achieve online operation. Among them, when the target flow meter with a body screw rod structure is operating, components such as the bottom ball valve handle are prone to hinder the operation, making it difficult to fully realize the rotational movement of the handle. Moreover, if this structure is applied to a large-diameter flow meter (such as DN100), the overall size must be enlarged to meet the volume requirements of the internal screw rod, which is not conducive to actual assembly. The utility model patent with the publication number of CN207649700 U discloses an online disassembly and assembly flow meter with a lifting mechanism, and its lifting mechanism adopts a single-side screw rod structure. During the lifting movement of this kind of flow meter, the pressure inside the pipeline is likely to cause unilateral jamming of the screw thread of the screw rod, and the single-side force on the slide rod fixing plate is prone to cause deviation of the stroke, resulting in inaccurate measurement or other conditions. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a chain drive online target flow meter to solve the problems of troublesome operation, unilateral thread jamming and stroke deviation prone to occur during the lifting process existing in the existing online plug-and-play flow meter.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A chain drive online target flow meter includes a meter head and a lifting mechanism. A sliding tube is arranged below the meter head. A sensor and a measuring head are arranged at the lower end of the sliding tube. A positioning tube is arranged outside the sliding tube. The lifting mechanism is used to drive the sliding tube to slide up and down in the positioning tube. The lifting mechanism includes an upper connecting plate and a lower connecting plate. The upper connecting plate and the lower connecting plate are respectively fixed at the upper ends of the sliding tube and the positioning tube. Two screw rods are symmetrically fixed on the left and right sides of the upper connecting plate. Screw nuts are in threaded cooperation with the two screw rods respectively. The two screw nuts are rotatably installed on both sides of the lower connecting plate. A sprocket transmission member is arranged between the upper connecting plate and the lower connecting plate. The sprocket transmission member includes a driving wheel, two driven wheels and a transmission chain. The transmission chain is engaged with the driving wheel and the two driven wheels. A driving shaft for driving the driving wheel to rotate is arranged on the driving wheel. The two driven wheels are respectively fixed at the upper ends of the two screw nuts.

[0007] Further, the lower connecting plate is in a "T" shape, and the two driven wheels are respectively arranged on the left plate and the right plate of the lower connecting plate. An adjusting hole and an adjusting screw rod penetrating through the adjusting hole are arranged on the lower plate of the lower connecting plate. Both ends of the adjusting screw rod are rotatably installed on the lower connecting plate, and a slider is in threaded fit with the middle part of the adjusting screw rod. The driving wheel is fixed on the slider.

[0008] Further, the transmission ratio of the sprocket transmission member is 1:2.

[0009] Further, stop nuts are arranged at the lower ends of both of the screw nuts.

[0010] Further, plain bearings are arranged at the upper and lower ends of the screw nut, and protective covers are arranged on all the plain bearings.

[0011] Further, the upper end of the screw rod is fixed on the upper connecting plate through a ball head nut.

[0012] Further, the drive shaft has a hexagonal prism structure.

[0013] Further, the upper connecting plate and the lower connecting plate are respectively detachably and fixedly connected to the sliding pipe and the positioning pipe.

[0014] The technical principle of the present utility model is as follows:

[0015] When maintenance is required, the drive shaft is rotated by a tool, thereby driving the driving wheel to rotate. The transmission chain transmits the power to the two driven wheels, causing the two driven wheels to rotate synchronously. The two screw nuts rotate following the corresponding driven wheels, thereby generating an upward or downward pushing force on the screw rod in threaded fit with them, causing a relative displacement between the screw rod and the screw nut, so as to drive the upper transmission plate to move upward or downward, and enable the sliding pipe to slide upward or downward in the positioning pipe, realizing the on-line operation of the flowmeter.

[0016] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0017] By arranging two groups of symmetric screw rods and screw nuts, and driving the two screw rods to rise or fall synchronously through the sprocket transmission member, compared with the target flowmeter adopting a single-side screw rod structure, the present application can minimize the screw rod jamming caused by the jacking of the internal pressure of the pipeline, and avoid the pulling deviation caused by the single-side force on the upper connecting plate. Compared with the target flowmeter adopting the body screw rod structure, the on-line operation of the present application is simpler and more convenient, the overall structure is compact, and it is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2Half-sectional view of the present utility model;

[0020] Figure 3 is Figure 2 the enlarged view at position A in

[0021] Figure 4 exploded view of the partial structure of the present utility model;

[0022] Figure 5 schematic diagram of the raised state of the present utility model.

[0023] The reference numerals in the accompanying drawings of the specification include: meter head 1, sliding tube 11, sensor 12, measuring head 13, positioning tube 14, upper connecting plate 2, lead screw 3, ball nut 31, lower connecting plate 4, adjusting hole 41, adjusting screw 42, slider 43, lead screw nut 5, plain bearing 51, protective cover 52, stop nut 53, sprocket drive 6, driving wheel 61, drive shaft 62, driven sprocket 63, drive chain 64, pipe 7. Specific embodiments

[0024] The following is a further detailed description through specific embodiments:

[0025] Embodiment

[0026] As Figure 1-2 shown, a chain-driven in-line target flowmeter includes a meter head 1. A sliding tube 11 is provided below the meter head 1. A sensor 12 and a measuring head 13 are provided at the lower end of the sliding tube 11. A positioning tube 14 is provided outside the sliding tube 11.

[0027] As Figure 1-3 shown, it further includes a lifting mechanism for driving the sliding tube 11 to slide up and down in the positioning tube 14. The lifting mechanism includes an upper connecting plate 2 and a lower connecting plate 4. The upper connecting plate 2 and the lower connecting plate 4 are respectively fixed to the upper ends of the sliding tube 11 and the positioning tube 14. Two lead screws 3 are symmetrically fixed to the left and right sides of the upper connecting plate 2 through ball nuts 31. Two lead screw nuts 5 are respectively in threaded cooperation with the two lead screws 3. By using the cooperation of the lead screw 3 and the lead screw nut 5, the relative movement between the lead screw nut 5 and the main body of the lead screw 3 can be realized. By selecting a reasonable friction angle of the lead screw 3, the lead screw nut 5 can also be frictionally locked at any position, so that the lifting mechanism has better stability.

[0028] As Figure 1-4 shown, the lower connecting plate 4 is in a "T" shape. Two lead screw nuts 5 are rotatably installed on the left and right plates of the lower connecting plate 4. Plain bearings 51 are sleeved on the upper and lower ends of the two lead screw nuts 5. A protective cover 52 is installed outside each plain bearing 51 to eliminate and reduce the resistance influence caused by friction; A stop nut 53 is also threadedly connected to the lower end of the lead screw nut 5 to prevent the lead screw 3 from falling off from the lead screw nut 5.

[0029] As shown Figure 1-4 in the figure, a sprocket drive 6 is provided between the upper connecting plate 2 and the lower connecting plate 4, and the transmission ratio of the sprocket drive 6 is 1:2; the sprocket drive 6 includes a driving wheel 61, two driven wheels and a transmission chain 64, and the transmission chain 64 is engaged on the driving wheel 61 and the two driven wheels. A driving shaft 62 for driving the driving wheel 61 to rotate is provided on the driving wheel 61; the two driven wheels are respectively fixed to the upper ends of the two lead screw nuts 5, and the corresponding driven wheel and the lead screw nut 5 are integrated by argon arc welding or laser welding; the driving shaft 62 of this embodiment has a hexagonal prism structure. When operating, workers can use a ratchet or an ordinary wrench to cooperate with the driving shaft 62 to rotate the driving shaft 62 in one direction repeatedly to realize the manual driving operation of the driving wheel 61, or use electric equipment such as a sleeve and a gun drill to cooperate with the driving shaft 62 to realize the semi-automatic driving operation of the driving wheel 61, or use electric equipment such as a rotary motor to cooperate with the driving shaft 62 to realize the automatic driving operation of the driving wheel 61.

[0030] As shown Figure 4 in the figure, an adjustment hole 41 and an adjustment screw 42 passing through the adjustment hole 41 are provided on the lower plate of the lower connecting plate 4. Both ends of the adjustment screw 42 are rotatably installed on the lower connecting plate 4. A slider 43 is in threaded cooperation with the middle part of the adjustment screw 42. The slider 43 is located in the adjustment hole 41, and the driving wheel 61 is fixed to the slider 43; rotating the adjustment screw 42 can make the slider 43 move along the adjustment screw 42 in the direction close to or away from the two driven wheels, so as to adjust the distance between the driving wheel 61 and the two driven wheels, keep the transmission chain 64 in a tensioned state to realize power transmission, and enable the two driven wheels to rotate synchronously.

[0031] Since multiple target flow meters are usually used to measure the flow rates of different pipelines 7 on site, the upper connecting plate 2 and the lower connecting plate 4 can be detachably connected to the sliding pipe 11 and the positioning pipe 14 to realize on-site installation and sharing of multiple flow meters. The recycling of the lifting mechanism and the chain drive can save costs and simplify the structure of the target flow meter, avoiding the bloated design of each target flow meter.

[0032] The specific implementation is as follows:

[0033] As shown Figure 5As shown, the chain-driven target flowmeter of this embodiment is installed on the pipeline 7. When the flowmeter needs to be inspected and maintained, the driving shaft 62 is rotated by a tool or equipment, thereby driving the driving wheel 61 to rotate, and the transmission chain 64 transmits power to the two driven wheels, so that the two driven wheels rotate synchronously, and the two lead screw nuts 5 rotate with the corresponding driven wheels, thereby generating an upward driving force on the lead screw 3 matched with its thread, so that the lead screw 3 and the lead screw nut 5 are relatively displaced, so as to drive the upper transmission plate to move upward, and the slide tube 11 slides upward in the positioning tube 14, so as to realize the online operation of the flowmeter; after the inspection and maintenance is completed, the driving shaft 62 is rotated in the opposite direction by a tool or equipment, so that the driving wheel 61 and the driven sprocket 63 rotate in the opposite direction, so that the two lead screw nuts 5 generate a downward driving force on the lead screw 3, so as to drive the upper transmission plate to move downward, so that the slide tube 11 slides downward in the positioning tube 14 and resets, and the flow in the pipeline 7 can be measured again.

[0034] The present application sets two sets of symmetrical screw rods 3 and screw rod nuts 5, and drives the two screw rods 3 to rise or move downward synchronously through a sprocket transmission part 6, which can minimize the screw rod 3 from being stuck due to the jacking of the internal pressure of the pipeline 7, and avoid the pulling effect caused by the unilateral force on the upper connecting plate 2, thereby improving the durability and operability of the chain-driven target flowmeter. In addition, the overall structure is compact and easy to assemble, and the online operation is simpler and more convenient.

[0035] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An on-line chain drive target flowmeter, comprising a meter head (1) and a lifting mechanism. A sliding tube (11) is provided below the meter head (1). A sensor (12) and a measuring head (13) are provided at the lower end of the sliding tube (11). A positioning tube (14) is arranged outside the sliding tube (11). The lifting mechanism is used to drive the sliding tube (11) to slide up and down in the positioning tube (14), characterized in that: The lifting mechanism includes an upper connecting plate (2) and a lower connecting plate (4). The upper connecting plate (2) and the lower connecting plate (4) are respectively fixed to the upper ends of a sliding pipe (11) and a positioning pipe (14). Two lead screws (3) are symmetrically fixed to the left and right sides of the upper connecting plate (2). Two lead screw nuts (5) are respectively in threaded fit with the two lead screws (3). The two lead screw nuts (5) are rotatably installed on both sides of the lower connecting plate (4). A sprocket transmission member (6) is provided between the upper connecting plate (2) and the lower connecting plate (4). The sprocket transmission member (6) includes a driving wheel (61), two driven wheels and a transmission chain (64). The transmission chain (64) is engaged with the driving wheel (61) and the two driven wheels. A driving shaft (62) for driving the driving wheel (61) to rotate is provided on the driving wheel (61). The two driven wheels are respectively fixed to the upper ends of the two lead screw nuts (5).

2. The in-line target flowmeter with chain drive according to claim 1, characterized in that: The lower connecting plate (4) is in a "T" shape. The two driven wheels are respectively arranged on the left plate and the right plate of the lower connecting plate (4). An adjusting hole (41) and an adjusting screw (42) passing through the adjusting hole (41) are provided on the lower plate of the lower connecting plate (4). Both ends of the adjusting screw (42) are rotatably installed on the lower connecting plate (4). A slider (43) is in threaded fit with the middle part of the adjusting screw (42). The driving wheel (61) is fixed to the slider (43).

3. The in-line target flowmeter with chain drive according to claim 1, characterized in that: The transmission ratio of the sprocket transmission member (6) is 1:

2.

4. The in-line target flowmeter with chain drive according to claim 1, wherein: Stop nuts (53) are provided at the lower ends of the two lead screw nuts (5).

5. The in-line target flowmeter with chain drive according to claim 4, characterized in that: Plain bearings (51) are provided at the upper and lower ends of the lead screw nut (5). Protective covers (52) are provided on all the plain bearings (51).

6. The in-line target flowmeter with chain drive according to claim 1, characterized in that: The upper end of the lead screw (3) is fixed to the upper connecting plate (2) through a ball head nut (31).

7. The in-line target flowmeter with chain drive according to claim 1, wherein: The driving shaft (62) has a hexagonal prism structure.

8. The in-line target flowmeter with chain drive according to claim 1, characterized in that: The upper connecting plate (2) and the lower connecting plate (4) are respectively detachably and fixedly connected to the sliding pipe (11) and the positioning pipe (14).

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