Eccentric tuning fork level switch probe

Abstract

The present invention relates to the technical field of level detection, and specifically provides an eccentric tuning fork level switch probe, aiming to solve the problem that the existing tuning fork level switch is difficult to maintain. To this end, the tuning fork level switch provided by the present invention includes a tuning fork, an eccentric pad and a vibrator excitation structure, the eccentric pad includes a pad and an eccentric block, the eccentric block is located on one side of the pad and abuts against the tuning fork; the vibrator excitation structure is located on the side of the eccentric pad away from the tuning fork, and is configured to vibrate the pad, and the position of the vibrator excitation structure vibrating the pad does not overlap with the eccentric block. The vibrator excitation structure, the eccentric pad and the tuning fork abut against each other, so that the vibrator excitation structure, the eccentric pad and the tuning fork can be separated and replaced, reducing the difficulty of maintenance, and the maintenance cost is greatly reduced, and the reliability after maintenance is high.

Description

Technical Field

[0001] The invention relates to the technical field of level detection, and specifically provides an eccentric tuning fork level switch probe. Background Art

[0002] Tuning fork level switches are widely used in process control of material levels in industries such as metallurgy, building materials, chemicals, light industry, and food. They are not affected by foam, eddy current, or gas during use, and are suitable for fixed-point alarm or control of the material levels of solid materials in various silos and the liquid levels in various containers. For example, for solid materials, they mainly measure medium-density solid powders or particles that can flow freely, such as fly ash, cement, sand, stone powder, plastic particles, salt, sugar, etc.; for liquid materials, they mainly measure explosive and non-explosive dangerous liquids, corrosive liquids, and high-viscosity liquids, such as water, acid, alkali, mud, pulp, dyes, oils, milk, wine, beverages, etc.

[0003] The tuning fork level switch includes an excitation source and a tuning fork. The excitation source drives the tuning fork to vibrate at a certain resonant frequency. When the tuning fork contacts the measured medium, the frequency and amplitude of the tuning fork will change. These changes are detected, processed and converted into a switch signal by the intelligent circuit. The tuning fork level probe has high measurement accuracy and is applicable to a wide range of occasions. It is one of the most widely used products in point monitoring products.

[0004] The excitation source is in direct contact with the tuning fork (the excitation source is generally sleeved on the periphery of the tuning fork). In order to achieve the excitation source driving the tuning fork to resonate, the assembly between the excitation source and the tuning fork needs to be repeatedly adjusted before the external structure of the tuning fork level switch is installed, and then fixed. In the structure of the existing tuning fork level switch, since the vibrator excitation structure is generally sleeved on the periphery of the tuning fork, this type of excitation method makes it difficult to adjust the assembly relationship between the vibrator excitation structure and the tuning fork so that the tuning fork reaches the resonant frequency. Therefore, once the resonance adjustment of the excitation source and the tuning fork is completed, in order to avoid loosening, welding and other methods are generally used to fix them, resulting in the existing tuning fork level switch being difficult to disassemble and repair. Even after disassembling and replacing the excitation source, it is difficult to adjust the assembly of the excitation source and the tuning fork to achieve resonance, and the time and energy spent on maintenance are not enough to cover the maintenance cost (in most cases, the maintenance cost is enough to purchase the finished product, so there is basically no possibility of maintenance).

[0005] In addition, after the excitation source and tuning fork are installed, the tuning fork needs to be lengthened by welding a tube of corresponding length according to different on-site requirements. Therefore, it needs to be installed first and then welded. It cannot be removed at will after welding, and there is basically no possibility of re-repair if problems are found.

[0006] In summary, the existing tuning fork level switch is difficult to disassemble and repair due to its own structural defects.

[0007] Therefore, there is an urgent need for an eccentric tuning fork level switch probe to solve the problem that the existing tuning fork level switch is difficult to maintain. Summary of the invention

[0008] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing tuning fork level switch is difficult to maintain.

[0009] In a first aspect, the present invention provides an eccentric tuning fork level switch probe, comprising: a tuning fork; an eccentric pad, comprising a pad and an eccentric block, wherein the eccentric block is located on one side of the pad and abuts against the tuning fork; a vibrator excitation structure, located on a side of the eccentric pad away from the tuning fork, configured to vibrate the pad, wherein the position at which the vibrator excitation structure vibrates the pad does not overlap with the eccentric block.

[0010] By adopting the above technical scheme, the vibrator excitation structure, the eccentric pad and the tuning fork are in contact with each other, so that the vibrator excitation structure, the eccentric pad and the tuning fork can be separated and replaced, reducing the difficulty of maintenance; wherein, the contact point between the eccentric block and the tuning fork does not coincide with the position of the vibrating pad of the vibrator excitation structure, so that the eccentric pad is slightly deflected, and after a single vibration of the vibrator excitation structure is completed, the eccentric pad is reset, thereby forming a reciprocating swing, and the high-speed reciprocating swing of the eccentric pad forms vibration and is transmitted to the tuning fork, causing the tuning fork to vibrate.

[0011] In a specific embodiment of the above-mentioned eccentric tuning fork level switch probe, the eccentric tuning fork level switch probe also includes an adjustment fitting, which is fixedly connected to the tuning fork, and a clamping piece is provided on the adjustment fitting, which is connected to the adjustment fitting to force the vibrator excitation structure to be close to the eccentric pad.

[0012] By adopting the above technical solution and adjusting the pressure of the clamping member pressing the vibrator excitation structure, the vibration frequency of the vibrator excitation structure driving the eccentric pad and the tuning fork to vibrate can be changed, thereby ensuring that the eccentric tuning fork level switch probe can maintain resonance after replacing the vibrator excitation structure.

[0013] In a specific embodiment of the above-mentioned eccentric tuning fork level switch probe, the vibrator excitation structure includes a base, a vibrator and an excitation source, one end of the vibrator is plugged into the base, and the end of the vibrator away from the base is abutted against the eccentric pad, and the excitation source is located between the vibrator and the base, and the excitation source is configured to drive the vibrator to move axially back and forth relative to the base.

[0014] By adopting the above technical solution, the excitation source can drive the vibrating hammer to move back and forth relative to the base, so that the vibrating hammer reciprocates and vibrates the eccentric pad, thereby causing the eccentric pad to swing back and forth.

[0015] In a specific implementation of the above eccentric tuning fork level switch probe, the pressing member and the base are the same component, and the base is threadedly connected to the adjusting fitting.

[0016] By adopting the above technical solution, the structure of the eccentric tuning fork level switch probe can be simplified.

[0017] In a specific implementation of the above eccentric tuning fork level switch probe, the excitation source is a piezoelectric ceramic or an electromagnetic coil.

[0018] In a specific embodiment of the above-mentioned eccentric tuning fork level switch probe, the tuning fork includes an inner tube component, one end of the inner tube component is provided with a receiving groove, and the eccentric pad is arranged in the receiving groove.

[0019] In a specific implementation of the above eccentric tuning fork level switch probe, the bottom of the accommodating groove protrudes and contacts the eccentric block.

[0020] By adopting the above technical solution, the eccentric block in the eccentric pad can be more easily contacted with the inner tube component.

[0021] In a specific implementation of the above eccentric tuning fork level switch probe, the tuning fork further includes an outer tube component, and the outer tube component is sleeved on the outer side of the inner tube component.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The eccentric tuning fork level switch probe provided by the present invention comprises a tuning fork, an eccentric pad and a vibrator excitation structure, wherein the eccentric pad comprises a pad and an eccentric block, wherein the eccentric block is located on one side of the pad and abuts against the tuning fork; the vibrator excitation structure is located on the side of the eccentric pad away from the tuning fork and is configured to vibrate the pad, wherein the position of the vibrator excitation structure vibrating the pad does not overlap with the eccentric block. The vibrator excitation structure, the eccentric pad and the tuning fork abut against each other, so that the vibrator excitation structure, the eccentric pad and the tuning fork can be separated and replaced, thereby reducing the difficulty of maintenance; in addition, the resonance frequency of the tuning fork can be adjusted by only adjusting the abutment tightness between the vibrator excitation structure, the eccentric pad and the tuning fork, so that the tuning fork level switch can maintain the original resonance frequency after replacing the vibrator excitation structure, thereby greatly reducing the maintenance cost and having high reliability after maintenance.

[0024] Furthermore, the eccentric tuning fork level switch probe also includes an adjustment fitting, which is fixedly connected to the tuning fork, and a pressing piece is provided on the adjustment fitting, which is connected to the adjustment fitting to force the vibrator excitation structure to be close to the eccentric pad. The pressure of the vibrator excitation structure pressed by the adjustment pressing piece can change the vibration frequency of the vibrator excitation structure driving the eccentric pad and the tuning fork to vibrate, thereby ensuring that the eccentric tuning fork level switch probe can maintain resonance after the vibrator excitation structure is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of the eccentric tuning fork level switch probe disclosed in the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the local structure in;

[0028] Figure 3 The invention discloses an exploded structural diagram of an eccentric tuning fork level switch probe.

[0029] Description of reference numerals:

[0030] 1. Vibrator excitation structure; 11. Base; 12. Vibrator hammer; 13. Excitation source; 2. Eccentric pad; 21. Pad; 22. Eccentric block; 3. Tuning fork; 31. Inner tube component; 311. Receiving groove; 32. Outer tube component; 4. Adjustment fitting. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0032] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In order to solve the problem that the existing tuning fork level switch is difficult to disassemble and repair, the present invention provides an eccentric tuning fork level switch probe, comprising a tuning fork, an eccentric pad and a vibrator excitation structure, the eccentric pad comprising a pad and an eccentric block, the eccentric block is located on one side of the pad and abuts against the tuning fork; the vibrator excitation structure is located on the side of the eccentric pad away from the tuning fork, and is configured to vibrate the pad, and the position of the vibrator excitation structure vibrating the pad does not overlap with the eccentric block.

[0035] The eccentric tuning fork level switch probe of some embodiments of the present disclosure is described below through specific examples.

[0036] like Figure 1 and Figure 3 As shown, the eccentric tuning fork level switch probe includes a vibrator excitation structure 1, an eccentric pad 2 and a tuning fork 3. The vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 are abutted and pressed in sequence, and the vibrator excitation structure 1 is used to vibrate the eccentric pad 2 to generate vibration, and then the vibration is transmitted to the tuning fork 3, so that the tuning fork 3 vibrates at a high speed. The vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 are abutted against each other, so that the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 can be separated and replaced, reducing the difficulty of maintenance. In addition, the resonance frequency of the tuning fork 3 can be adjusted by only adjusting the abutment tightness between the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3, so that the tuning fork level switch can also maintain the original resonance frequency after replacing the vibrator excitation structure 1, and its maintenance cost is greatly reduced, and the reliability after maintenance is high.

[0037] Specifically, Figure 2 As shown, the eccentric pad 2 includes a pad 21 and an eccentric mass 22, the eccentric mass 22 is located on one side of the pad 21 and abuts against the tuning fork 3, and the vibrator excitation structure 1 abuts against the side of the pad 21 away from the eccentric mass 22. The position where the vibrator excitation structure 1 vibrates the pad 21 does not overlap with the contact position between the eccentric mass 22 and the tuning fork 3. After the vibrator excitation structure 1 vibrates the pad 21, the eccentric pad 2 will be deflected as a whole. After the vibration is completed, the eccentric pad 2 will reset, thereby generating a swing, and the high-frequency swing forms a vibration. Since the eccentric pad 2 is in contact with the tuning fork 3, the vibration can be transmitted to the tuning fork 3.

[0038] It should be noted that if the vibrator excitation structure 1 is used to directly vibrate the tuning fork 3, the tuning fork 3 will not swing, so no obvious vibration will be generated, and it will be more difficult to achieve resonance. Therefore, the main invention of the present invention is to set an eccentric pad 2 between the vibrator excitation structure 1 and the tuning fork 3, and use the vibrator excitation structure 1 to vibrate the eccentric pad 2 to generate swing to form vibration, which is then transmitted to the tuning fork 3, thereby forming a vibration with a large amplitude and achieving resonance.

[0039] From the disassembly inspection data of the failed tuning fork level switch, most of the current tuning fork level switches cannot work properly due to the failure of the excitation source 13 in the vibrator excitation structure 1. After the vibrator excitation structure 1 is replaced, the tightness of the fit between the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 will change, resulting in a change in the resonant frequency of the tuning fork 3. In order to adjust the tightness of the fit between the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 to maintain the resonant frequency of the tuning fork 3, the eccentric tuning fork level switch probe of the present invention is provided with an adjustment fitting 4. The adjustment fitting 4 is fixedly connected to the tuning fork 3 (for example, welded or threaded), and a clamping member is provided on the adjustment fitting 4, which cooperates with the adjustment member to force the vibrator excitation structure 1 to be close to the eccentric pad 2. By adjusting the pressure of the clamping piece pressing the vibrator excitation structure 1, the tightness of the fit between the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 can be changed, thereby changing the vibration frequency of the vibrator excitation structure 1 driving the eccentric pad 2 and the tuning fork 3 to vibrate, thereby ensuring that the eccentric tuning fork level switch probe can maintain the resonance characteristics unchanged through adjustment after the vibrator excitation structure 1 is replaced.

[0040] In a specific example of the present invention, Figure 2 As shown, the vibrator excitation structure 1 includes a base 11, a vibrator 12 and an excitation source 13. One end of the vibrator 12 is plugged into the base 11, and the vibrator 12 can reciprocate axially relative to the base 11. The end of the vibrator 12 away from the base 11 abuts against the eccentric pad 2. The excitation source 13 is located between the vibrator 12 and the base 11, and the excitation source 13 is configured to drive the vibrator 12 to reciprocate axially relative to the base 11, so as to reciprocate and vibrate the eccentric pad 2, so that the eccentric pad 2 can form a reciprocating swing and generate vibration.

[0041] It should be noted that the above vibrator excitation structure 1 is only an example of the present invention. Without departing from the principle of the present invention, those skilled in the art may also adopt other vibrator excitation structures 1 as long as they can achieve high-speed vibration of the eccentric pad 2.

[0042] For example, the excitation source 13 is a piezoelectric ceramic, and by inputting an electrical signal into the piezoelectric ceramic, the piezoelectric ceramic can be vibrated, thereby driving the vibrator 12 to vibrate the eccentric pad 2, wherein the vibration frequency of the piezoelectric ceramic is related to the input electrical signal. Of course, without departing from the principle of the present invention, the excitation source 13 can also be other components that can drive the vibrator 12 to reciprocate axially relative to the base 11, such as an electromagnetic coil.

[0043] In addition, in a specific example of the present invention, the base 11 and the pressing member are the same component, and the base 11 is threadedly connected to the adjusting fitting 4, thereby simplifying the structure of the eccentric tuning fork level switch probe. By rotating the base 11, the positional relationship between the base 11 and the adjusting fitting 4 can be adjusted axially, and the matching tightness of the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3 can be changed, thereby adjusting the resonance power of the vibrator excitation structure 1, the tuning fork 3 and the eccentric pad 21.

[0044] Of course, this is not a specific limitation of the present invention. In other possible implementations, the base 11 and the pressing member may be different components, which should all be included in the protection scope of the present invention.

[0045] The tuning fork 3 includes an inner tube component 31 and an outer tube component 32. The outer tube component 32 is sleeved on one end of the inner tube component 31 and the two are fixedly connected. In a specific example of the present invention, the inner tube component 31 and the outer tube component 32 are welded. The vibration of the inner tube component 31 can be transmitted to the outer tube component 32. The outer tube component 32 is a closed pipe and contacts the measured medium.

[0046] An end of the inner tube component 31 away from the outer tube component 32 is provided with a receiving groove 311, and the eccentric pad 2 is placed in the receiving groove 311 to position the eccentric pad 2. In addition, the inner tube component 31 protrudes at the bottom of the receiving groove 311, and the protruding portion contacts the eccentric block 22, so that the eccentric block 22 in the eccentric pad 2 can contact the inner tube component 31 more easily.

[0047] In summary, the working principle of the eccentric tuning fork level switch probe provided by the present invention is:

[0048] The excitation source 13 is configured to drive the vibrator 12 to reciprocate axially relative to the base 11 to reciprocately vibrate the eccentric pad 2, causing the eccentric pad 2 to swing to generate vibration, which is then transmitted to the tuning fork 3, thereby generating a vibration with a larger amplitude to achieve resonance.

[0049] When the vibrator excitation structure 1 needs to be replaced, the vibrator excitation structure 1 is screwed out of the adjusting fitting 4, and the new vibrator excitation structure 1 is screwed into the adjusting fitting 4, and the screwing depth of the vibrator excitation structure 1 is gradually adjusted to change the fitting tightness of the vibrator excitation structure 1, the eccentric pad 2 and the tuning fork 3, thereby changing the vibration frequency of the vibrator excitation structure 1 driving the eccentric pad 2 and the tuning fork 3 to vibrate, thereby ensuring that the eccentric tuning fork level switch probe can maintain the resonance characteristics unchanged through adjustment after the vibrator excitation structure 1 is replaced.

[0050] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An eccentric tuning fork level switch probe, characterized in that: include: tuning fork(3); An eccentric pad (2), comprising a pad (21) and an eccentric block (22), wherein the eccentric block (22) is located on one side of the pad (21) and abuts against the tuning fork (3); The vibrator excitation structure (1) is located on a side of the eccentric pad (2) away from the tuning fork (3) and is configured to vibrate the pad (21). The position where the vibrator excitation structure (1) vibrates the pad (21) does not overlap with the eccentric block (22).

2. The eccentric tuning fork level switch probe according to claim 1, characterized in that: The eccentric tuning fork level switch probe further comprises an adjusting fitting (4), wherein the adjusting fitting (4) is fixedly connected to the tuning fork (3), and a pressing piece is arranged on the adjusting fitting (4), wherein the pressing piece is connected to the adjusting fitting (4) to force the vibrator excitation structure (1) to be in close contact with the eccentric pad (2).

3. The eccentric tuning fork level switch probe according to claim 2, characterized in that: The vibrator excitation structure (1) comprises a base (11), a vibrator (12) and an excitation source (13); one end of the vibrator (12) is plugged into the base (11); one end of the vibrator (12) away from the base (11) is in contact with the eccentric pad (2); the excitation source (13) is located between the vibrator (12) and the base (11); and the excitation source (13) is configured to drive the vibrator (12) to reciprocate axially relative to the base (11).

4. The eccentric tuning fork level switch probe according to claim 3, characterized in that: The pressing piece and the base (11) are the same component, and the base (11) is threadedly connected to the adjusting fitting (4).

5. The eccentric tuning fork level switch probe according to claim 3, characterized in that: The excitation source (13) is a piezoelectric ceramic or an electromagnetic coil.

6. The eccentric tuning fork level switch probe according to claim 1, characterized in that: The tuning fork (3) comprises an inner tube component (31), one end of the inner tube component (31) is provided with a receiving groove (311), and the eccentric pad (2) is arranged in the receiving groove (311).

7. The eccentric tuning fork level switch probe according to claim 6, characterized in that: The bottom of the accommodating groove (311) is protruding and in contact with the eccentric block (22).

8. The eccentric tuning fork level switch probe according to claim 6, characterized in that: The tuning fork (3) further comprises an outer tube component (32), wherein the outer tube component (32) is sleeved on the outer side of the inner tube component (31).

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