Level switch

Abstract

The utility model relates to the field of level switches, in particular to a level switch, which adopts the technical scheme that the level switch comprises a level switch body and a blade, a protection assembly is mounted outside the level switch body, guide insertion rods are symmetrically mounted on two sides of the protection assembly, a limiting assembly is mounted at the lower end of the protection assembly, and the blade is mounted on the limiting assembly. The utility model has the beneficial effects that the blade can be protected, and when the level switch is not needed and needs to be carried out or transported, the positioning plate can be pulled down, so that the positioning plate drives the telescopic corrugated pipe to extend and unfold, and the telescopic corrugated pipe is positioned outside the blade for protection at the moment; and the guide insertion rod is in threaded connection with the first threaded hole and the second threaded hole through external threads at the two ends, so that after the telescopic corrugated pipe is unfolded, the telescopic corrugated pipe can be kept in a vertical fixed state, the blades can be shielded and protected when not used, and the blades are prevented from being damaged or deformed.

Description

Technical Field

[0001] The utility model relates to the field of level switches, in particular to a level switch. Background Art

[0002] Level measurement usually refers to the detection of the height of materials (solid or liquid level) in closed or open containers in industrial production processes; if the material height is detected continuously, it is called continuous measurement. If only the material height is detected to see whether it has reached a certain position, it is called limit measurement. The instrument that completes this measurement task is called a level switch.

[0003] In the prior art, the level switch is mainly composed of a switch body and a blade at the lower end. When in use, the blade needs to be inserted into the container. When the blade contacts the measured medium, the frequency and amplitude of the blade will change. These changes are detected, processed and converted into a switch signal by an intelligent circuit. However, when the level switch is not in use and needs to be carried or transported, most of the blades are directly exposed to the outside without protective devices. Not only are they easily contaminated with dust, but when the blades are impacted or bumped, the blades are also easily deformed and damaged, affecting subsequent use.

[0004] Therefore, it is necessary to invent a level switch. Utility Model Content

[0005] The purpose of the utility model is to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a level switch, comprising a level switch body and a blade, wherein the blade is mounted at the lower end of the level switch body, a protection component is mounted on the outside of the level switch body, guide rods are symmetrically mounted on both sides of the protection component, and a limit component is mounted at the lower end of the protection component;

[0007] The protection component includes a fixing plate and a telescopic bellows installed at the lower end of the fixing plate, and a positioning plate is installed at the lower end of the telescopic bellows.

[0008] Based on the above characteristics: the fixed plate is fixed on the outside of the level switch body. When the level switch body is inserted into the container using the blades, the guide rod can be removed and the positioning plate can be pushed upward so that the positioning plate pushes the telescopic bellows to the outside of the level switch body. At this time, the telescopic bellows will be squeezed and gathered together, and the limit assembly will also limit the positioning plate to prevent the telescopic bellows from pushing the positioning plate down by itself. When it is not needed and needs to be carried or transported outside, the level switch body and the blades can be removed from the container, and then the limit assembly on the positioning plate is released, and the positioning plate is pulled down at the same time, so that the positioning plate drives the telescopic bellows to extend and unfold. At this time, the telescopic bellows will be located outside the blade for protection. Finally, the guide rod can be inserted into the fixed plate and the positioning plate on both sides to limit. At this time, the fixed plate, the telescopic bellows and the positioning plate will remain in a vertical positioning state, so that the blades can be shielded and protected when not in use to prevent damage or deformation of the blades.

[0009] Preferably, limit slots are provided at intervals on the lower end surface of the level switch body.

[0010] Based on the above features: when the positioning plate pushes the telescopic bellows to the outside of the level switch body, the positioning plate will be aligned with the limit slot. At this time, the limit assembly can be inserted into the limit slot to limit and fix the positioning plate.

[0011] Preferably, first threaded holes are symmetrically provided on both sides of the fixing plate, and a fixing rod is fixedly installed on the bottom of the fixing plate.

[0012] Based on the above features: the upper end of the guide rod is movably inserted through the first threaded hole, and the fixing rod can limit the positioning plate after the positioning plate moves up, so that the positioning plate cannot move further when it reaches the lower end of the fixing rod, which facilitates the rapid alignment of the limiting assembly and the limiting slot.

[0013] Preferably, second threaded holes are symmetrically formed on both sides of the positioning plate.

[0014] Based on the above features: the lower end of the guide rod movably penetrates the positioning plate through the second threaded hole.

[0015] Preferably, external threads are symmetrically provided on the surfaces of both ends of the guide rod.

[0016] Based on the above features: the guide rod is threadedly connected with the first threaded hole and the second threaded hole by using external threads at both ends, so that the telescopic bellows will remain in a vertically fixed state after the telescopic bellows is unfolded.

[0017] Preferably, the limiting assembly includes a movable groove and a through groove formed on one side of the movable groove, and a limiting block is movably penetrated inside the through groove.

[0018] Based on the above features: when the positioning plate is needed to pull the telescopic bellows downward, the limit block can be pushed back to the inside of the through slot. At this time, the limit block will be separated from the limit slot, and finally the positioning plate can be pulled to drive the telescopic bellows to move downward and expand.

[0019] Preferably, a pull plate is installed at the upper end of the limit block, and the pull plate movably passes through the movable groove, and a buffer spring is installed on one side of the limit block.

[0020] Based on the above features: personnel can drive the limit block to move by pushing the pull plate, and when the limit block is pushed back into the through slot, the buffer spring will be squeezed and deformed, and when the pull plate is released, the buffer spring will rebound and extend the limit block out of the through slot. Due to the limitation of the pull plate by the movable slot, the limit block is prevented from leaving the through slot.

[0021] The beneficial effects of the utility model are:

[0022] 1. The blades can be protected. When the level switch is not needed and needs to be carried or transported outside, the positioning plate can be pulled down to make the positioning plate drive the telescopic bellows to extend and unfold. At this time, the telescopic bellows will be located outside the blade for protection, and the guide rod will be threadedly connected with the first threaded hole and the second threaded hole using the external threads at both ends. After the telescopic bellows is unfolded, the telescopic bellows will remain in a vertically fixed state, so that the blades can be shielded and protected when not in use to prevent damage or deformation of the blades.

[0023] 2. It is convenient for the movable adjustment of the positioning plate. The personnel can drive the limit card block to move by pushing the pull plate. When the limit card block is pushed back to the inside of the through slot, the buffer spring will be squeezed and deformed. At this time, the limit card block will be out of the limit card slot, so that the positioning plate can drive the telescopic bellows to move downward and unfold. When the positioning plate is pushed upward so that the positioning plate pushes the telescopic bellows to the outside of the level switch body, the fixed rod can limit the positioning plate so that the positioning plate cannot move further when it reaches the lower end of the fixed rod, and the through slot and the limit card slot will also be in an aligned state. Finally, the limit card block can be inserted into the inside of the limit card slot. At this time, the blade will be exposed outside, and the positioning plate will be fixed and cannot move downward by itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A diagram showing the rising state of a level switch protection component provided by the utility model;

[0025] Figure 2 A diagram showing the descending state of a level switch protection component provided by the utility model;

[0026] Figure 3 A schematic diagram of the overall structure of a level switch provided by the utility model;

[0027] Figure 4A schematic diagram of the structure of a positioning plate of a level switch provided by the utility model;

[0028] Figure 5 A level switch provided by the utility model Figure 4 Schematic diagram of the local structure at point A in the middle.

[0029] In the figure: 1. level switch body; 11. limit card slot; 2. blade; 3. protection component; 31. fixing plate; 311. first threaded hole; 312. fixing rod; 32. telescopic bellows; 33. positioning plate; 331. second threaded hole; 4. guide rod; 41. external thread; 5. limit assembly; 51. movable slot; 52. through slot; 53. limit card block; 531. pull plate; 532. buffer spring. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] See attached Figure 1-5 The utility model provides a level switch, comprising a level switch body 1 and a blade 2, wherein the blade 2 is mounted at the lower end of the level switch body 1, a protection component 3 is mounted outside the level switch body 1, guide rods 4 are symmetrically mounted on both sides of the protection component 3, and a limit component 5 is mounted at the lower end of the protection component 3;

[0032] The protection assembly 3 includes a fixing plate 31 and a telescopic bellows 32 installed at the lower end of the fixing plate 31 , and a positioning plate 33 is installed at the lower end of the telescopic bellows 32 .

[0033] The fixing plate 31 is fixed to the outside of the level switch body 1. When the level switch body 1 is inserted into the container using the blade 2, the guide rod 4 can be removed and the positioning plate 33 can be pushed upward to make the positioning plate 33 push the telescopic bellows 32 to the outside of the level switch body 1. At this time, the telescopic bellows 32 will be squeezed together, and the limit assembly 5 will also limit the positioning plate 33 to prevent the telescopic bellows 32 from pushing the positioning plate 33 downward by itself. When the level switch body 1 is not needed and needs to be carried or transported outside, the level switch body can be placed in a container. The body 1 and the blade 2 are removed from the container, and then the limit assembly 5 for the positioning plate 33 is released, and the positioning plate 33 is pulled down at the same time, so that the positioning plate 33 drives the telescopic bellows 32 to extend and unfold. At this time, the telescopic bellows 32 will be located outside the blade 2 for protection. Finally, the guide rod 4 can be used to insert the fixed plate 31 and the positioning plate 33 on both sides for limiting. At this time, the fixed plate 31, the telescopic bellows 32 and the positioning plate 33 will maintain a vertical positioning state, so that the blade 2 can be shielded and protected when it is not in use to prevent the blade 2 from being damaged or deformed.

[0034] Preferably, limit slots 11 are provided at intervals on the lower end surface of the level switch body 1 .

[0035] When the positioning plate 33 pushes the telescopic bellows 32 to the outside of the level switch body 1 , the positioning plate 33 will be aligned with the limit slot 11 . At this time, the limit assembly 5 can be inserted into the limit slot 11 to limit and fix the positioning plate 33 .

[0036] Preferably, first threaded holes 311 are symmetrically formed on both sides of the fixing plate 31 , and a fixing rod 312 is fixedly installed on the bottom of the fixing plate 31 .

[0037] The upper end of the guide rod 4 is movably inserted through the first threaded hole 311, and the fixing rod 312 can limit the positioning plate 33 after the positioning plate 33 moves up, so that the positioning plate 33 cannot move further when it reaches the lower end of the fixing rod 312, thereby facilitating rapid alignment of the limiting component 5 with the limiting slot 11.

[0038] Preferably, second threaded holes 331 are symmetrically formed on both sides of the positioning plate 33 .

[0039] The lower end of the guide rod 4 movably penetrates the positioning plate 33 through the second threaded hole 331 .

[0040] Preferably, external threads 41 are symmetrically formed on the surfaces of both ends of the guide rod 4 .

[0041] The guide rod 4 is threadedly connected with the first threaded hole 311 and the second threaded hole 331 by using the external threads 41 at both ends, so that the telescopic bellows 32 will remain in a vertically fixed state after being unfolded.

[0042] Preferably, the limiting assembly 5 comprises a movable groove 51 and a through groove 52 formed on one side of the movable groove 51 , and a limiting block 53 is movably penetrated inside the through groove 52 .

[0043] Personnel can adjust the movement of the limit block 53 through the movable slot 51. When the positioning plate 33 is aligned with the limit slot 11, the limit block 53 can be extended out of the through slot 52 and inserted into the limit slot 11 for internal limiting. When the positioning plate 33 is needed to pull the telescopic bellows 32 downward, the limit block 53 can be pushed back to the inside of the through slot 52. At this time, the limit block 53 will be separated from the limit slot 11. Finally, the positioning plate 33 can be pulled to drive the telescopic bellows 32 to move downward and expand.

[0044] Preferably, a pull plate 531 is installed at the upper end of the limiting block 53 , and the pull plate 531 movably passes through the movable slot 51 . A buffer spring 532 is installed at one side of the limiting block 53 .

[0045] A person can drive the limit block 53 to move by pushing the pull plate 531, and when the limit block 53 is pushed back into the through slot 52, the buffer spring 532 will be squeezed and deformed. When the pull plate 531 is released, the buffer spring 532 will rebound and extend the limit block 53 out of the through slot 52. Due to the limitation of the pull plate 531 by the movable slot 51, the limit block 53 is prevented from escaping from the through slot 52.

[0046] The use process of the utility model is as follows: when the level switch is not needed and needs to be carried or transported outside, the pull plate 531 can be pushed to drive the limit card block 53 to retract into the through slot 52. At this time, the limit card block 53 will be separated from the limit card slot 11, and then the positioning plate 33 is pulled down to make the positioning plate 33 drive the telescopic bellows 32 to extend and unfold. At this time, the telescopic bellows 32 will be located outside the blade 2 for protection, and the guide rod 4 will be threadedly connected with the first threaded hole 311 and the second threaded hole 331 by the external threads 41 at both ends, so that after the telescopic bellows 32 is unfolded, the telescopic bellows 32 can be easily opened. 32 will remain in a vertically fixed state. When the level switch needs to be used, the guide rod 4 can be removed first, and then the positioning plate 33 can be pushed upward so that the positioning plate 33 pushes the telescopic bellows 32 to the outside of the level switch body 1. At this time, the fixing rod 312 can limit the positioning plate 33, so that the positioning plate 33 cannot move further when it reaches the lower end of the fixing rod 312, and the through groove 52 and the limiting card slot 11 will also be in an aligned state. Finally, the limiting card block 53 can be used to snap into the limiting card slot 11. At this time, the blade 2 will be exposed to the outside, making it convenient for the blade 2 to be inserted into the container for use.

[0047] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A level switch, comprising a level switch body (1) and a blade (2), wherein the blade (2) is mounted at the lower end of the level switch body (1), characterized in that: A protection component (3) is installed outside the level switch body (1), guide rods (4) are symmetrically installed on both sides of the protection component (3), and a limit component (5) is installed at the lower end of the protection component (3); The protection assembly (3) comprises a fixing plate (31) and a telescopic bellows (32) mounted at the lower end of the fixing plate (31); a positioning plate (33) is mounted at the lower end of the telescopic bellows (32).

2. A level switch according to claim 1, characterized in that: The lower end surface of the level switch body (1) is provided with limit slots (11) at intervals.

3. A level switch according to claim 1, characterized in that: First threaded holes (311) are symmetrically provided on both sides of the fixing plate (31), and a fixing rod (312) is fixedly mounted on the bottom of the fixing plate (31).

4. A level switch according to claim 1, characterized in that: Second threaded holes (331) are symmetrically formed on both sides of the positioning plate (33).

5. A level switch according to claim 1, characterized in that: External threads (41) are symmetrically formed on the surfaces of both ends of the guide rod (4).

6. A level switch according to claim 1, characterized in that: The limiting assembly (5) comprises a movable groove (51) and a through groove (52) provided on one side of the movable groove (51), wherein the limiting block (53) is movably penetrated inside the through groove (52).

7. A level switch according to claim 6, characterized in that: A pull plate (531) is installed at the upper end of the limit block (53), and the pull plate (531) movably penetrates the movable groove (51). A buffer spring (532) is installed on one side of the limit block (53).

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