A field-drawn level gauge for atmospheric pressure water tanks

Abstract

This utility model discloses a field pull-wire level gauge for atmospheric pressure water tanks, comprising dynamic and static parts. The dynamic part includes: a float, a pendant, a pull wire connecting the float and the pendant at both ends, a pulley, pulley isolation washers, and stainless steel rollers at the pull wire conduit opening. The static part includes: a float guide rail, a pull wire conduit, a stainless steel pin (pulley shaft), a pin support, a pull wire conduit opening roller bracket, and a scale plate. The scale plate is fixed to the water tank body, and the pendant and float are connected by the pull wire. The pull wire moves through the grooves of the rollers and two corner pulleys. Annular bosses are added to both ends of the pulleys, and isolation washers are added between the pulleys and the pin support on both sides. This utility model, using stainless steel rollers, effectively reduces friction and wear between the pull wire and the conduit opening, effectively improving the service life of the field pull-wire level gauge, reducing the frequency of maintenance and repair, and reducing the safety risks of long-term operation of the device.

Description

Technical Field

[0001] This utility model is designed in the field of mechanical technology, specifically as a pull-wire level gauge for use in atmospheric pressure water tanks. Background Technology

[0002] The pull-wire level gauge is an important safety accessory for atmospheric pressure water tanks and a crucial parameter indicator during process operation. The pull-wire level gauge consists of two parts: a moving part and a stationary part. The moving part includes: a float, a pendant, a pull wire connecting the float and the pendant at both ends, carbon steel pulleys, and bearings. The stationary part includes: a float guide rail, a pull wire guide tube, a carbon steel pin (pulley shaft), a pin support, and a scale plate. During operation, the float rises and falls with the liquid level in the tank. The pull wire connecting the float and the pendant at both ends, through the guide tube and two corner pulleys, pulls the pendant up and down on the scale plate surface. The reading indicated by the pendant is the liquid level value in the tank. The commonly used on-site pull-wire level gauge structure for atmospheric pressure water tanks suffers from a highly humid environment within the pull-wire conduit, particularly during summer when the conduit is exposed to intense sunlight. This high temperature causes the lubricant in the pulley bearing to melt and flow, resulting in insufficient lubrication. Operating in this humid and insufficiently lubricated environment, the bearing balls are prone to rusting and seizing, preventing the pulley from rotating. This constant friction and wear between the pulley and the pulley eventually leads to breakage. Furthermore, frequent swaying of the pulley due to wind or other factors during operation causes prolonged friction between the pulley and the conduit opening, resulting in breakage and shortened service life, increased maintenance frequency. Distortion in the on-site level gauge poses a safety risk to the long-term stable operation of the equipment. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a field pull-wire level gauge for atmospheric pressure water tanks that is corrosion-resistant, wear-resistant, simple in structure, has an increased service life, and reduces the frequency of inspection and maintenance.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A field pull-wire level gauge for atmospheric pressure water tanks includes two parts: a moving part and a stationary part. The moving part includes: a float, a pendant, a pull wire connecting the float and the pendant at both ends, a pulley, a pulley isolation washer, and a stainless steel roller at the pull wire conduit opening. The stationary part includes: a float guide rail, a pull wire conduit, a stainless steel pin (pulley shaft), a pin support, a pull wire conduit opening roller bracket, and a scale plate. The scale plate is fixed to the water tank body, and the pendant and float are connected by the pull wire. The pull wire moves through the grooves of the roller and two corner pulleys. Annular bosses are added to both ends of the pulley, and isolation washers are added between the pulley and the pin support on both sides.

[0006] Preferably, the diameter of the annular boss is the same as that of the isolation washer; the roller bracket and the cable guide are fixed by welding.

[0007] Preferably, the float guide rail is fixed to the bottom plate and top cover of the water tank with bolts; the stainless steel pin is fixed to the pin support with bolts.

[0008] Preferably, the inner diameter of the pulley is 18-20mm, and the pulley and the pin directly form a clearance fit; the thickness of the pulley is 28-30mm.

[0009] This utility model discloses a field pull-wire level gauge for atmospheric pressure water tanks. It eliminates the bearing structure of commonly used pull-wire level gauges, reduces the inner diameter of the pulley, allowing for a direct clearance fit between the pulley and the pin, and increases the pulley thickness from 20 mm to 30 mm. Annular bosses are designed at both ends of the pulley, and isolation washers are added between the pulley and the pin support on both sides. Because the area of ​​the annular bosses is much smaller than the pulley end face area, the friction area is significantly reduced, effectively lowering the friction between the pulley and the pin support. The stainless steel isolation washers on both sides of the pulley prevent wear between the pulley and the pin support and also prevent the pulley from shifting laterally on the pin. Stainless steel rollers are added to the pull-wire guide opening. These rollers consist of two identical pulleys assembled side-by-side on a bracket with their rope grooves facing each other, allowing the pull wire to pass through the middle of the grooves. The pull wire and the grooves create rolling friction, further reducing wear on the pull wire.

[0010] This invention offers significant advantages over existing technologies. As the above technical solution demonstrates, changing the pin material of the pulley from carbon steel to stainless steel and the pulley material from carbon steel to PTFE effectively solves the problem of rust and jamming in commonly used pull-wire level gauges. Furthermore, the pulley in this invention eliminates the bearing structure, reduces the inner diameter of the pulley to directly form a clearance fit with the pin, and increases the pulley thickness to minimize wobble between the pulley and the pin. Annular bosses are designed at both ends of the pulley, and isolation washers are added between the pulley sides and the pin support. The diameters of the annular bosses and isolation washers are the same. The area of ​​the annular bosses is much smaller than the pulley end face area, greatly reducing the friction area and effectively lowering the friction between the pulley and the pin support. The stainless steel isolation washers on both sides of the pulley prevent wear between the pulley and the pin support and also prevent the pulley from shifting laterally on the pin. The use of stainless steel in the pulley design effectively reduces friction and wear between the pulley and the guide tube opening. This effectively improves the service life of the on-site pull-wire level gauge, reduces the frequency of inspection and maintenance, and reduces the safety risks to the long-term operation of the equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is the schematic diagram of the roller structure of this utility model;

[0013] Figure 3 This is a top view of the pulley structure of this utility model;

[0014] Figure 4 This is a schematic diagram of the pulley structure of this utility model;

[0015] The markings in the diagram are: 1. Scale plate, 2. Pendant, 3. Pull line, 4. Pull line guide port to roller bracket, 5. Stainless steel roller, 6. Pull line guide, 7. Pin support, 8. PTFE pulley, 9. Stainless steel pin, 10. Annular boss, 11. Isolation washer, 12. Float, 13. Float guide rail. Detailed Implementation

[0016] The following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a field level gauge for an atmospheric pressure water tank according to this utility model.

[0017] like Figure 1 As shown, this utility model provides a field pull-wire level gauge for atmospheric pressure water tanks, comprising a scale plate 1, a pendant 2, a pull wire 3, a roller bracket 4, rollers 5, a guide tube 6, a shaft pin support 7, a pulley 8, a shaft pin 9, an annular boss 10, an isolation washer 11, a float 12, and a float guide rail 13. The scale plate 1 is welded and fixed to the water tank wall. The pendant 2 is embedded in the scale plate 1 by a snap-fit. The guide tube 6 is made of carbon steel, with one end welded and fixed to the top of the water tank (the top opening connects with the guide tube hole), and the other end welded and fixed to the guide tube support, which is welded and fixed to the water tank. The two float guide rails 13 are stainless steel cables, with one end fixed to the top of the water tank and the other end fixed to the bottom of the water tank, and the spacing is the same as the diameter of the float. The float 12 and the pendant 2 are connected by a pull line 3, which passes through the gap between the rollers 5 and the two corner pulleys 8. The axle pin support 7 is made of carbon steel and is welded and fixed to the guide tube 6. The axle pin 9 is made of stainless steel and is welded and fixed to the axle pin support 7.

[0018] like Figure 2 As shown, the roller bracket 4 is welded and fixed to the pipe opening of the conduit 6, and the roller 5 is connected to the roller bracket 4 by a shaft pin. The pull wire 3 passes through the middle of the roller 5.

[0019] like Figure 3 As shown, the pulley 8 is made of PTFE and has annular bosses 10 at both ends. The pulley 8, the annular bosses 10 and the isolation washer 11 are connected by axle pins 9.

[0020] Working principle: such as Figure 1As shown, with the rise and fall of the water level in the tank, the pull cable 3 moves through the grooves of the roller 5 and the two corner pulleys 8, converting sliding friction into rolling friction, effectively reducing wear on the pull cable. Since both the pulleys 8 and the pin 9 are made of rust-free material, and the contact friction area between the annular boss 10 of the roller and the isolation washer 11 is small, there is almost no resistance or wear, thus solving the problem of pulley jamming due to rust. The roller bracket 4 is fixed to the pull cable guide 6 by welding. The float guide rail 13 is fixed to the bottom plate and top cover of the water tank by bolts. The stainless steel pin 9 is fixed to the pin support 7 by bolts.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A field pull-wire level gauge for an atmospheric pressure water tank, comprising a moving part and a stationary part; the moving part includes: a float, a pendant, a pull wire connecting the float and the pendant at both ends, a pulley, a pulley isolation washer, and a stainless steel roller at the pull wire conduit opening; the stationary part includes: a float guide rail, a pull wire conduit, a stainless steel pin, a pin support, a pull wire conduit opening roller bracket, and a scale plate; characterized in that The scale plate is fixed on the water tank body, and the pendant and float are connected by a pull line; the pull line moves through the grooves of the roller and two corner pulleys; annular bosses are added to both ends of the pulleys, and isolation washers are added between the two sides of the pulleys and the pin supports.

2. A site drawn liquid level gauge for atmospheric water tanks as claimed in claim 1 wherein: The float guide rail is fixed to the bottom plate and top cover of the water tank with bolts; the stainless steel pin is fixed to the pin support with bolts.

3. A site drawn liquid level gauge for atmospheric water tanks as claimed in claim 1 wherein: The inner diameter of the pulley is 18-20mm, and the pulley and the pin directly form a clearance fit; the thickness of the pulley is 28-30mm.

4. A site drawn liquid level gauge for atmospheric water tanks as claimed in claim 1 wherein: The annular boss has the same diameter as the isolation gasket.

5. A field-drawn level gauge for an atmospheric pressure water tank as described in claim 1, characterized in that: The roller bracket and the cable guide are fixed together by welding.

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