Resistance rotation type material level switch with protective cover

Abstract

The utility model relates to the technical field of material level switches, discloses a rotation-resistant material level switch with a protective cover, and aims to overcome the defects that in the prior art, in the material storage process of a blanking barrel, blades are prone to misoperation and smashing damage. According to the utility model, the switch case, the rotating shaft, the blades, the assembly sleeve, the sealing ring, the supporting disc, the positioning flange, the protective cover main body, the fastener and the like are matched, and the structural characteristics that the arc-shaped protective cover main body and the outer edge of the arc-shaped protective cover main body are in an arc-shaped eave shape are utilized, so that the blades and the rotating shaft can be effectively prevented from being hit by coal ash and coal briquettes in the blanking barrel, and adhesion is prevented; the protection range accurately avoids a detection area to reduce false triggering; the connection design of the support disc and the positioning flange and the connection design of the assembly sleeve and the fixing sleeve realize independent disassembly and assembly of the protective cover, the sealing ring prevents leakage and does not affect operation of the rotating shaft, power plant working conditions are adapted, the service life of the switch is prolonged, and monitoring stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of level switch technology, and in particular to a rotary paddle level switch with a protective cover. Background Technology

[0002] There are many methods for measuring and protecting the material level of coal conveying and ash removal hoppers and silo pumps in thermal power plants. According to their principles, the most frequently used types include passive nuclear type, rotary paddle type, capacitive type, mechanical type, and inductive type. Among them, rotary paddle level switches have relatively high reliability and are widely used.

[0003] Chinese Patent Publication No. CN215448095U discloses a protective cover for the shaft of a rotary paddle level switch, comprising: a protective cover body, a second flange, and a sealing part; the protective cover body has a second through hole at the center of one end, and a first groove is formed around the second through hole; it can provide overall protection for the shaft of the rotary paddle level switch and improve the service life of the rotary paddle level switch.

[0004] Regarding the above and existing related technologies, the inventors believe that the following defects often exist: Although the device can provide enveloping protection for the shaft, bearing and seal through the protective cover body, its protective effect is obviously limited: the protection range is only focused on the bearing and seal area at the rear end of the shaft, and does not cover the core detection component blade, which causes the blade to be directly exposed to the impact of falling material. It is easy to cause false triggering due to deformation caused by coal block impact or material adhesion. Therefore, there is room for improvement. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing technology is prone to blade misoperation and damage during the material storage process of the feeding cylinder. To address this, we propose a rotary paddle level switch with a protective cover.

[0006] To achieve the above objectives, this application adopts the following technical solution: a rotary paddle level switch with a protective cover, comprising a switch housing, a rotating shaft being connected through one side of the switch housing, a blade being installed at one end of the rotating shaft, an assembly sleeve being rotatably connected to the outer end of the rotating shaft near the switch housing, a support plate being threaded onto the outer side of the assembly sleeve, a protective cover body being welded to the side of the support plate near the blade, the protective cover body being located above the blade, the main view section of the protective cover body being arc-shaped with an arc angle α of 240°, and its diameter being greater than the length of the blade, a positioning flange being provided on the side of the support plate near the switch housing, the positioning flange being welded to the inner wall of the feed cylinder, fasteners being evenly connected between the positioning flange and the support plate, and assembly plates being installed on the upper and lower ends of the switch housing near the positioning flange.

[0007] Preferably, the support plate includes a central plate, a fixing sleeve is fixed at the center of the central plate, the interior of the fixing sleeve is connected to the assembly sleeve by threads, and an assembly flange is fixed at the outer edge of the central plate, with the assembly flange and the positioning flange corresponding one-to-one.

[0008] Preferably, the center plate, the fixed sleeve, and the assembly flange are made of an integral steel plate structure.

[0009] Preferably, the fixing sleeve and the protective cover body are coaxially and collinearly distributed, and the protective cover body and the central disk are welded and fixed.

[0010] Preferably, the main body of the protective cover is made of seamless steel pipe, and the outer edge of the main body of the protective cover is set in the shape of an arc-shaped eave.

[0011] Preferably, the assembly sleeve and the annular groove formed on the rotating shaft are rotatably connected, and a sealing ring is provided on the outside of the assembly sleeve near the end of the switch box.

[0012] Preferably, the tightening direction of the assembly sleeve and the fixing sleeve is consistent with the running rotation direction of the blade.

[0013] Preferably, the shaft and blades are detachable, with the blades positioned below the main body of the protective cover near the center.

[0014] Preferably, the assembly plate has an L-shaped cross-section, and the assembly plate and the switch box are detachable.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] In this utility model, the main body of the 240° arc-shaped protective cover is made of seamless steel pipe and has an outer edge in the shape of an arc roof. It can effectively block the direct impact of coal ash and coal blocks in the feed cylinder on the blades and rotating shaft, avoid damage to the parts, and prevent the material from sticking and accumulating.

[0017] Furthermore, the 240° protection range precisely avoids the material level detection area below the blade, ensuring that the material accumulation resistance can be normally sensed when the blade rotates, reducing the problems of easy false triggering and detection failure of traditional rotary paddle level switches;

[0018] Meanwhile, the fastener connection between the support plate and the positioning flange, the threaded engagement structure between the assembly sleeve and the fixed sleeve, and the detachable assembly plate design of the switch box enable the separate disassembly and installation of the main body of the protective cover without the need for destructive disassembly of the discharge cylinder, rotating shaft, or blades. At the same time, the rotational connection between the assembly sleeve and the rotating shaft and the sealing design of the sealing ring do not affect the normal operation of the rotating shaft and prevent material leakage, greatly reducing the difficulty of maintenance and the risk of equipment damage during repair. This allows the device to stably adapt to the harsh working conditions of coal conveying and ash removal in thermal power plants, effectively extending the service life of the rotary paddle level switch, reducing the frequency of daily maintenance, and improving the long-term operational stability of the level monitoring system. Attached Figure Description

[0019] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the support plate of this utility model;

[0022] Figure 3 This is a three-dimensional structural diagram of the assembly sleeve of this utility model;

[0023] Figure 4 This is a schematic diagram of the upward-viewing planar structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the front view of the present invention.

[0025] Figure 6 This is a schematic diagram of the main body of the protective cover of this utility model.

[0026] Legend: 1. Switch box; 2. Shaft; 3. Blade; 4. Assembly sleeve; 41. Sealing ring; 5. Support plate; 51. Center plate; 52. Fixing sleeve; 53. Assembly flange; 6. Positioning flange; 7. Protective cover body; 8. Fastener; 9. Assembly plate. Detailed Implementation

[0027] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0028] Reference Figures 1-6As shown, this utility model provides a technical solution: a rotary paddle level switch with a protective cover, including a switch housing 1, a rotating shaft 2 is connected through one side of the switch housing 1, a blade 3 is installed at one end of the rotating shaft 2, an assembly sleeve 4 is rotatably connected to the outer end of the rotating shaft 2 near the switch housing 1, a support plate 5 is threaded on the outer side of the assembly sleeve 4, a protective cover body 7 is welded to the side of the support plate 5 near the blade 3, the protective cover body 7 is located above the blade 3, the main view section of the protective cover body 7 is arc-shaped and the arc angle α is 240°, its diameter is greater than the length of the blade 3, a positioning flange 6 is provided on the side of the support plate 5 near the switch housing 1, the positioning flange 6 is welded to the inner wall of the feed cylinder, fasteners 8 are evenly connected between the positioning flange 6 and the support plate 5, and assembly plates 9 are installed on the upper and lower ends of the switch housing 1 near the positioning flange 6.

[0029] The structure of the protective cover body 7 forms a protective barrier above the blades 3 to prevent impact on the blades 3 when coal ash enters the feed chute, thus preventing accidental triggering of the blades 3 and improving structural protection of the rotating shaft 2. Simultaneously, it does not affect the rotational operation of the blades 3. Furthermore, the protective cover body 7 is designed with a 240° protection range (according to the appendix). Figure 6 (As shown by the arc angle α), it will not affect the blade 3's judgment of the coal ash storage height in the feed cylinder. At the same time, it helps to avoid the accumulation of coal ash at the top of the protective cover body 7, allowing the coal ash to slide down to both sides along the arc surface. Meanwhile, the large arc of 240° further reduces the coal ash hanging on the walls at both sides and increases the protection range on both sides of the blade 3. Furthermore, by utilizing the assembly connection between the support plate 5 and the positioning flange 6, as well as the threaded sleeve between the assembly sleeve 4 and the support plate 5, the protective cover body 7 can be disassembled separately. This does not affect the positioning, maintenance and repair work of the protective cover body 7 after it is installed inside the feed cylinder, and reduces the damage to the feed cylinder, the rotating shaft 2, and the blade 3 during maintenance and disassembly.

[0030] Reference Figure 2 As shown in this embodiment: the support plate 5 includes a central plate 51, a fixing sleeve 52 is fixed at the center of the central plate 51, the interior of the fixing sleeve 52 is connected to the assembly sleeve 4 by threads, and an assembly flange 53 is fixed on the outer edge of the central plate 51, the assembly flange 53 and the positioning flange 6 are in one-to-one correspondence.

[0031] By utilizing the support plate 5, the main body 7 of the protective cover can be disassembled, and the disassembly can avoid damage to the feed cylinder and the rotating shaft 2. At the same time, the threaded connection between the fixed sleeve 52 and the assembly sleeve 4 is strong and has a certain sealing effect to prevent the leakage of coal ash and other materials.

[0032] Reference Figure 2 As shown, the center plate 51, the fixed sleeve 52, and the assembly flange 53 are made of an integral steel plate structure.

[0033] The support plate 5 here has an overall thickness of 10mm, which is moderate and has good structural strength. It can effectively and stably connect with the positioning flange 6 to ensure the support of the protective cover body 7.

[0034] Reference Figure 4 , Figure 5 As shown, the fixed sleeve 52 and the protective cover body 7 are coaxially and collinearly distributed, and the protective cover body 7 and the central disk 51 are welded and fixed.

[0035] By using a coaxial setting, it is ensured that the protective cover body 7 effectively covers the area above the rotating shaft 2 and blade 3, and does not obstruct the coal ash located below the blade 3, thus ensuring the normal determination of the material height in the feed cylinder when the blade 3 is rotating.

[0036] Reference Figure 2 As shown, the main body 7 of the protective cover is made of seamless steel pipe, and the outer edge of the main body 7 of the protective cover is set in an arc-shaped eaves.

[0037] The use of steel pipes ensures that the main body of the protective cover 7 has good load-bearing capacity, reducing the possibility of deformation when hit by coal ash or coal blocks. At the same time, the arched eaves structure ensures effective protection while reducing the space occupied in the material drop hopper.

[0038] Reference Figure 3 As shown, the assembly sleeve 4 is rotatably connected to the annular groove on the rotating shaft 2, and a sealing ring 41 is provided on the outside of the assembly sleeve 4 near the end of the switch box 1.

[0039] The rotating connection between the assembly sleeve 4 and the rotating shaft 2 ensures the normal rotation of the rotating shaft 2 after installation. At the same time, the sealing ring 41 is used to seal the outer end of the fixed sleeve 52 and the corresponding mounting hole on the discharge cylinder to prevent the leakage of stored materials such as coal ash.

[0040] Reference Figure 3 , Figure 4 As shown, the tightening direction of the assembly sleeve 4 and the fixing sleeve 52 is consistent with the running rotation direction of the blade 3.

[0041] By utilizing the consistency of direction, it is ensured that the rotating shaft 2 will not generate a reverse torsional force on the assembly sleeve 4 when it rotates, thus avoiding loosening between the assembly sleeve 4 and the fixed sleeve 52.

[0042] Reference Figure 3 As shown, the shaft 2 and the blade 3 are detachable, with the blade 3 located below the main body 7 of the protective cover near the center.

[0043] The shaft 2 and blade 3 are connected by a common existing installation method, namely, the shaft 2 and blade 3 are connected by bolts. Since this is existing technology, no further details are provided.

[0044] Reference Figure 5 As shown, the cross-section of the assembly plate 9 is L-shaped, and the assembly plate 9 and the switch box 1 are detachable and installable.

[0045] Here, the assembly plate 9 and the switch box 1 are connected by bolts. At the same time, the assembly plate 9 is used to selectively reinforce the switch box 1 and the outer wall of the feeding cylinder with bolts to ensure the connection of the switch box 1 is reliable.

[0046] Working principle: Mounting holes are pre-set on the discharge cylinder for inserting the rotating shaft 2. The positioning flange 6 is welded to the outside of the mounting holes. The support plate 5 is installed on the inner wall of the discharge cylinder, corresponding to the position of the positioning flange 6. The two are connected and fixed by fasteners 8, including countersunk bolts, nuts and other components. The protective cover body 7 is located above the mounting holes. The switch box 1 is installed on the outer wall of the discharge cylinder. The rotating shaft 2 passes through the fixing sleeve 52. The sealing ring 41 is manually screwed until the assembly sleeve 4 is screwed into the inside of the fixing sleeve 52, and until the sealing ring 41 cannot be screwed and is attached to the outer end of the mounting hole. Then the assembly plate 9 is fixed to the outer wall of the discharge cylinder by screws and other means. Then the blade 3 is assembled onto the rotating shaft 2.

[0047] As coal ash or coal chunks continuously fall into the feeding hopper, the protective cover body 7 shields the area above the blades 3 to prevent the material from directly impacting the shaft 2 and blades 3. Simultaneously, the motor and torque detection component inside the switch box 1 (this is an existing technology) are activated, causing the shaft 2 to slowly rotate the blades 3. When the material accumulates in the feeding hopper to near the height of the blades 3, the material will occupy the space below the blades 3, thus generating resistance during the rotation of the blades 3. The detection component in the switch box 1 receives this resistance signal, thereby triggering the alarm at the rear end and automatically disconnecting the motor to stop the rotation of the blades 3. When the alarm sounds, the surface has reached the maximum storage capacity of the feeding hopper. During the material discharge process of the feeding hopper, the above mechanism can be used to determine whether the material has been discharged.

[0048] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A rotary paddle level switch with a protective cover, characterized in that, The device includes a switch housing, with a rotating shaft running through one side. A blade is mounted on one end of the rotating shaft. An assembly sleeve is rotatably connected to the outer end of the rotating shaft near the switch housing. A support plate is threaded onto the outer side of the assembly sleeve. A protective cover body is welded to the side of the support plate near the blade. The protective cover body is located above the blade. The main view section of the protective cover body is arc-shaped with an arc angle α of 240°, and its diameter is greater than the length of the blade. A positioning flange is provided on the side of the support plate near the switch housing. The positioning flange is welded to the inner wall of the discharge cylinder. Fasteners are evenly connected between the positioning flange and the support plate. Assembly plates are installed on the upper and lower ends of the switch housing near the positioning flange.

2. The rotary paddle level switch with a protective cover according to claim 1, characterized in that: The support plate includes a central plate, a fixing sleeve is fixed at the center of the central plate, the interior of the fixing sleeve is connected to the assembly sleeve by threads, and an assembly flange is fixed at the outer edge of the central plate, the assembly flange and the positioning flange are in one-to-one correspondence.

3. The rotary paddle level switch with a protective cover according to claim 2, characterized in that: The central plate, fixed sleeve, and assembly flange are made of integrated steel plate.

4. The rotary paddle level switch with a protective cover according to claim 2, characterized in that: The fixing sleeve and the protective cover body are coaxially and collinearly distributed, and the protective cover body and the central disk are welded and fixed.

5. The rotary paddle level switch with a protective cover according to claim 1, characterized in that: The main body of the protective cover is made of seamless steel pipe, and the outer edge of the main body of the protective cover is set in the shape of an arc-shaped eave.

6. The rotary paddle level switch with a protective cover according to claim 1, characterized in that: The assembly sleeve is rotatably connected to the annular groove formed on the rotating shaft, and a sealing ring is provided on the outside of the assembly sleeve near the end of the switch box.

7. The rotary paddle level switch with a protective cover according to claim 2, characterized in that: The tightening direction of the assembly sleeve and the fixing sleeve is consistent with the running rotation direction of the blade.

8. The rotary paddle level switch with a protective cover according to claim 1, characterized in that: The shaft and blades are detachable, and the blades are located below the main body of the protective cover, near the middle.

9. The rotary paddle level switch with a protective cover according to claim 6, characterized in that: The assembly plate has an L-shaped cross-section, and the assembly plate and the switch box are detachable.

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