Ultra-small blind area guided wave type radar level meter

Abstract

The utility model belongs to the technical field of radar level meters, and particularly relates to an ultra-small blind area guided wave type radar level meter which comprises a level meter body, a flexible cable and a probe and further comprises a flange plate, the flange plate is installed on the lower portion of the level meter body in a sleeved mode and fixed to the level meter body, a connecting plate is fixed to the lower surface of the flange plate, and the flexible cable is arranged on the connecting plate. A protective shell is movably mounted on the lower surface of the connecting disc, and a bottom cover is fixedly mounted at an opening in the bottom of the protective shell through bolts; the clamping assembly is arranged, the motor is used for driving, the gear, the inner rack and the outer rack are used for transmission, the first clamping plate, the second clamping plate and the two flexible hoops are used for clamping the waveguide, rapid and convenient replacement of the waveguide is achieved, and the problem that in a traditional device, the efficiency is low when the waveguide is replaced is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to radar level meter technical field, especially relates to a super-small blind area waveguide type radar level meter. BACKGROUND

[0002] Waveguide type radar level meter is a kind of measuring instrument based on time travel principle, and its working principle is to emit high-frequency pulse electromagnetic wave, and utilize these pulses to propagate along the cable or probe stick.When the pulse meets the surface of the medium to be measured, part of the pulse is reflected back, and then received by the receiver.By calculating the time difference between the transmitted pulse and the reflected pulse, the distance of the medium surface can be accurately measured, and then converted into a level signal.

[0003] Waveguide type radar level meter has many advantages, it can measure liquid, slurry and granular material and other media, and is not affected by the viscosity, temperature, pressure and density of medium.In addition, waveguide radar level meter also has low transmitting power, harmless to human body and environment, so it is widely used in chemical industry, petroleum, food, pharmaceutical and other industries.

[0004] However, the conventional waveguide radar level meter has some limitations, such as large blind area, which limits its application in small tanks or special working conditions.Blind area refers to the area where the probe cannot accurately measure, usually including top blind area and bottom blind area.The top blind area refers to the minimum distance between the highest material surface and the measurement reference point, while the bottom blind area refers to the distance that the cable cannot accurately measure at the bottom.The only way to ensure the reliability of the measurement is to place the material between the two blind areas.In order to effectively reduce the measurement blind area of the waveguide radar level meter in the prior art, the prior art often adds a waveguide tube outside the cable to improve the stability of the cable in the process of transmitting radar signals.However, the waveguide tube will lose its waveguide effect after a long time of use, resulting in a decrease in the signal received by the level meter and an increase in the blind area.The prior art cannot quickly and effectively replace the waveguide tube, and during replacement, it often needs to be detached from the inside of the level meter, which is time-consuming and laborious, and the efficiency is low.In view of this, we propose a super-small blind area waveguide type radar level meter. SUMMARY

[0005] The utility model aims at providing a super-small blind area waveguide type radar level meter to solve the problems in the above background.

[0006] Therefore, the utility model provides a super-small blind area waveguide type radar level meter, which comprises a level meter main body, a flexible cable and a probe, and further comprises:

[0007] A flange plate is sleeved and fixed to the lower part of the level gauge body and fixed with the level gauge body, the lower surface of the flange plate is fixed with a connecting plate, the lower surface of the connecting plate is movably fixed with a protective shell, and the bottom opening of the protective shell is fixed with a bottom cover through bolts.

[0008] A waveguide is sleeved and fixed to the outer side of the flexible cable, and the top end of the waveguide extends to the inner cavity of the protective shell through the bottom cover.

[0009] A clamping assembly is arranged on the upper surface of the bottom cover and used for clamping and fixing the waveguide.

[0010] Two groups of connecting assemblies are symmetrically arranged on the two sides of the connecting plate and used for facilitating the quick mounting or dismounting between the connecting plate and the protective shell.

[0011] In the above technical scheme, further, the clamping assembly comprises:

[0012] A bottom plate is fixedly installed on the upper surface of the bottom cover, the upper surface of the bottom plate is slidably installed with symmetrically arranged clamping plate one and clamping plate two, the upper surface of the bottom plate and between the clamping plate one and the clamping plate two is symmetrically rotatably installed with a gear, the two sides of the gear are respectively connected with an inner gear rack and an outer gear rack, one end of each of the two inner gear racks is fixed with the inner side wall of the clamping plate one, and one end of each of the two outer gear racks is fixed with the inner side wall of the clamping plate two.

[0013] In the above technical scheme, further, the clamping assembly further comprises:

[0014] A motor is fixedly installed on the bottom plate, a bearing seat is fixedly installed on the upper surface of the bottom plate and at the output shaft end position of the motor, a threaded rod is coaxially connected to the bearing seat, a threaded block is threadedly connected to the threaded rod and slidably matched with the bottom plate, the threaded block is fixedly connected with the clamping plate one, and the output shaft of the motor is coaxially connected with the threaded rod.

[0015] In the above technical scheme, further, the inner side wall of each of the clamping plate one and the clamping plate two is fixed with a flexible clamp, the arc-shaped inner wall of the flexible clamp is provided with a hemispherical protrusion, and the flexible clamp has elasticity.

[0016] In the above technical scheme, further, the connecting assembly comprises:

[0017] The plug is fixedly installed on the upper surface of the protection shell, a plug insertion accommodating hole is formed in the connecting disc, a receiving groove and a sliding groove are respectively formed in the connecting disc and close to the periphery of the insertion hole, the receiving groove is arranged between the insertion hole and the sliding groove, a baffle is slidably installed in the sliding groove, a spring is arranged on the side of the baffle away from the insertion hole, a pull rod is slidably installed in the sliding groove, one end of the pull rod penetrates the inner wall of the sliding groove and extends into the baffle, the pull rod is sleeved with the baffle, the pull rod and the baffle are in a welded fixed state at the sleeving position, a limiting block is fixed on the end of the pull rod close to the insertion hole, the limiting block has a straight trapezoidal structure in cross section, the other end of the pull rod penetrates the inner wall of the sliding groove and extends to the outside, and a knob is threadedly connected to the end of the pull rod outside, a limiting hole is formed in the plug to accommodate the insertion of the knob, and the knob is inserted into the limiting hole.

[0018] In the above technical solution, further, a circular hole is formed in the center of the bottom cover to accommodate the passing of the waveguide tube, and air permeable holes are formed on the bottom cover and located on the periphery of the circular hole.

[0019] In the above technical solution, further, the flexible cable is fixedly installed at the bottom center of the level gauge main body, and the probe is fixedly installed at the end of the flexible cable away from the level gauge main body.

[0020] The utility model discloses the beneficial effect is:

[0021] 1. The super-small blind area waveguide type radar level gauge, through setting up clamping assembly, utilizing motor drive, through gear, internal gear and external gear transmission, utilizing clamping plate one, clamping plate two and two flexible clamps to clamp waveguide tube, realize the quick and convenient of waveguide tube when replacing, solve the problem of low efficiency when replacing waveguide tube in traditional device.

[0022] 2. The super-small blind area waveguide type radar level gauge, through setting up two groups of connecting assembly, make also not need through dismantling the multiple bolts of bottom when maintaining clamping assembly, greatly shorten the maintenance time of device whole, improve the maintenance efficiency. ACCURACY

[0023] Figure 1 It is the whole structure schematic diagram of the utility model;

[0024] Figure 2 It is the structure schematic diagram of level gauge main body, flexible cable and probe in the utility model;

[0025] Figure 3 It is the exploded schematic view of flange plate, connecting disc, protection shell and bottom cover in the utility model;

[0026] Figure 4 Figure 1 is a structural schematic diagram of the clamping assembly in the utility model;

[0027] Figure 5 Figure 2 is a structural schematic diagram of the connecting assembly in the utility model.

[0028] The figure marks are:

[0029] 1, level gauge main body; 2, flexible cable; 3, probe; 4, flange plate; 5, connecting plate; 6, protective shell; 7, bottom cover; 8, waveguide; 9, bottom plate; 10, clamping plate one; 11, clamping plate two; 12, flexible clamp; 13, gear; 14, inner gear rack; 15, outer gear rack; 16, motor; 17, bearing seat; 18, threaded rod; 19, threaded block; 20, plug; 21, jack; 22, storage groove; 23, sliding groove; 24, baffle; 25, spring; 26, pull rod; 27, limit block; 28, knob; 29, limit hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described examples are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those skilled in the relevant art may not be discussed in detail, but should be regarded as part of the authorized specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0032] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the data so distinguished can occur in any order. Terms such as "first", "second", and the like can be understood as having either a chronological meaning or a logical meaning, but they are not necessarily understood as having a chronological meaning, unless it is expressly stated that a chronological order is intended. The same applies to terms such as "one", "another", "at least one", and the like. Furthermore, the terms "comprise", "contain", and the like should be interpreted as referring to elements, components, or the like without excluding the presence of one or more other elements, components, or the like.

[0033] It should be noted that in the description of the present application, the orientation or positional relationship indicated by terms such as "front", "back", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", and "top", "bottom" and the like is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. In the absence of contrary indications, these orientation terms do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the outline of the respective components.

[0034] It should be noted that in the present application, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0035] Embodiment 1:

[0036] Referring to Figure 1 - Figure 5 As shown in the drawings, the present embodiment provides an ultra-small blind area waveguide type radar level gauge, which comprises a level gauge body 1, a flexible cable 2 and a probe 3, and further comprises:

[0037] Flange 4 is fitted onto the lower part of the level gauge body 1 and fixed to the level gauge body 1. A connecting plate 5 is fixed to the lower surface of the flange 4. A protective shell 6 is movably installed on the lower surface of the connecting plate 5. A bottom cover 7 is fixed to the bottom opening of the protective shell 6 by bolts.

[0038] Waveguide 8 is sleeved on the outside of flexible cable 2, and the top end of waveguide 8 passes through bottom cover 7 and extends into the inner cavity of protective shell 6.

[0039] A clamping assembly is disposed on the upper surface of the bottom cover 7 and is used to clamp and fix the waveguide 8.

[0040] Two sets of connecting components are arranged symmetrically and are respectively located on both sides of the connecting plate 5, which facilitates quick installation or removal between the connecting plate 5 and the protective shell 6;

[0041] In this embodiment, the clamping assembly includes:

[0042] The chassis 9 is fixedly installed on the upper surface of the bottom cover 7. The upper surface of the chassis 9 is slidably mounted with a first clamp 10 and a second clamp 11 arranged symmetrically. A gear 13 is symmetrically rotatably mounted on the upper surface of the chassis 9 between the first clamp 10 and the second clamp 11. An inner rack 14 and an outer rack 15 are respectively meshed on both sides of the gear 13. One end of each of the two inner racks 14 is fixed to the inner side wall of the first clamp 10, and one end of each of the two outer racks 15 is fixed to the inner side wall of the second clamp 11.

[0043] In this embodiment, the clamping assembly further includes:

[0044] Motor 16 is fixedly mounted on chassis 9. A bearing seat 17 is fixedly mounted on the upper surface of chassis 9 at the output shaft end of motor 16. A threaded rod 18 is coaxially connected to bearing seat 17. A threaded block 19 is threadedly connected to threaded rod 18 and is slidably fitted with chassis 9. The threaded block 19 is fixedly connected to clamping plate 10. The output shaft of motor 16 is coaxially connected to threaded rod 18.

[0045] In this embodiment, the connection component includes:

[0046] The plug 20 is fixedly installed on the upper surface of the protective shell 6. The connecting plate 5 has a plug 20 that can accommodate the insertion of the plug 20. Inside the connecting plate 5 and near the socket 21, there are a storage groove 22 and a sliding groove 23 respectively. The storage groove 22 is located between the socket 21 and the sliding groove 23. A baffle 24 is slidably installed in the sliding groove 23. A spring 25 is provided on the side of the baffle 24 away from the socket 21. A pull rod 26 is slidably installed in the sliding groove 23, and one end of the pull rod 26 passes through the inner part of the sliding groove 23. The wall extends into the baffle 24, and the pull rod 26 is sleeved with the baffle 24. The position where the pull rod 26 and the baffle 24 are sleeved is welded and fixed. One end of the pull rod 26 near the insertion hole 21 is fixed with a limit block 27, and the cross-section of the limit block 27 is a right trapezoidal structure. The other end of the pull rod 26 passes through the inner wall of the sliding groove 23 and extends to the outside. The end of the pull rod 26 located on the outside is threaded with a knob 28. The plug 20 is provided with a limit hole 29 that can accommodate the insertion of the knob 28. The knob 28 is inserted into the limit hole 29.

[0047] The working principle of this device is as follows:

[0048] When replacing the waveguide 8, simply start the motor 16. The output shaft of the motor 16 will rotate and drive the threaded rod 18 to rotate. Under the action of the thread force, the threaded block 19 will slide outward from the chassis 9 and drive the clamping plate 10 to move. At this time, the clamping plate 10 will pull the two internal racks 14 to move to one side of the motor 16. The internal racks 14 will drive the gear 13 to rotate. Under the action of the gear 13, the external rack 15 will move away from the motor 16 and push the clamping plate 11 to move away from the motor 16. At this time, the two flexible clamps 12 will gradually lose their grip on the waveguide 8. Then the operator can pull the waveguide 8 down and remove it. After replacing it with a new waveguide 8, place it back in its original position and start the motor 16 in reverse phase. The principle is the same as above. The new waveguide 8 can be clamped by the two flexible clamps 12.

[0049] When maintaining the clamping assembly inside the protective shell 6, in order to reduce the unnecessary disassembly and installation of multiple bolts, it can be quickly disassembled through the two connecting components above. The specific process is as follows: Pull the knob 28 outward, the knob 28 drives the pull rod 26 to move outward. At this time, the spring 25 is compressed by the baffle 24, while the limiting block 27 retracts into the inner cavity of the storage groove 22. The limiting block 27 and the limiting hole 29 no longer form a constraint relationship. At this time, pull the protective shell 6 down to remove the protective shell 6 and the clamping assembly inside the protective shell 6.

[0050] Example 2:

[0051] This embodiment provides an ultra-small blind zone guided wave radar level gauge. In addition to the technical solution of the above embodiment, it also has the following technical features: the inner sidewalls of clamp 10 and clamp 2 are both fixed with flexible clamps 12. The arc-shaped inner wall of the flexible clamp 12 is provided with a hemispherical protrusion, and the flexible clamp 12 is elastic.

[0052] Among them, the flexible clamp 12 can perfectly fit the outer wall of the waveguide 8. When the two flexible clamps 12 move inward at the same time, they can effectively clamp and fix the waveguide 8.

[0053] By setting the flexible clamp 12, the waveguide 8 can be fixed more stably.

[0054] Example 3:

[0055] This embodiment provides an ultra-small blind zone guided wave radar level gauge. In addition to the technical solution of the above embodiment, it also has the following technical features: a circular hole is provided at the center of the bottom cover 7 to accommodate the waveguide tube 8, and vent holes are uniformly distributed on the bottom cover 7 and on the periphery of the circular hole.

[0056] By providing ventilation holes, the heat generated by the motor 16 during operation is prevented from accumulating in the inner cavity of the protective shell 6.

[0057] Example 4:

[0058] This embodiment provides an ultra-small blind zone guided wave radar level gauge. In addition to the technical solutions of the above embodiments, it also has the following technical features: the flexible cable 2 is fixedly installed at the bottom center of the level gauge body 1, and the probe 3 is fixedly installed at the end of the flexible cable 2 away from the level gauge body 1.

[0059] The installation and connection relationships between the level gauge body 1, the flexible cable 2, and the probe 3 are all technologies already disclosed in the prior art, and will not be described in detail in this application. Those skilled in the art should be familiar with them.

[0060] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A guided-wave radar level gauge with an ultra-small blind zone, comprising a level gauge body (1), a flexible cable (2), and a probe (3), characterized in that, Also includes: Flange (4), the flange (4) is sleeved and installed on the lower part of the level gauge body (1) and fixed to the level gauge body (1). A connecting plate (5) is fixed on the lower surface of the flange (4). A protective shell (6) is movably installed on the lower surface of the connecting plate (5). A bottom cover (7) is fixed at the bottom opening of the protective shell (6) by bolts. Waveguide (8), which is sleeved on the outside of flexible cable (2), and the top end of waveguide (8) passes through bottom cover (7) and extends into the inner cavity of protective shell (6); A clamping assembly is disposed on the upper surface of the bottom cover (7) and is used to clamp and fix the waveguide (8); Two sets of connecting components are arranged symmetrically and respectively on both sides of the connecting plate (5), and are used to facilitate quick installation or disassembly between the connecting plate (5) and the protective shell (6).

2. The ultra-small blind zone guided wave radar level gauge according to claim 1, characterized in that, The clamping assembly includes: A chassis (9) is fixedly installed on the upper surface of a bottom cover (7). A first clamping plate (10) and a second clamping plate (11) are symmetrically arranged and slidably installed on the upper surface of the chassis (9). A gear (13) is symmetrically rotatably installed on the upper surface of the chassis (9) between the first clamping plate (10) and the second clamping plate (11). An inner rack (14) and an outer rack (15) are respectively meshed on both sides of the gear (13). One end of each of the two inner racks (14) is fixed to the inner sidewall of the first clamping plate (10), and one end of each of the two outer racks (15) is fixed to the inner sidewall of the second clamping plate (11).

3. The ultra-small blind zone guided wave radar level gauge according to claim 2, characterized in that, The clamping assembly further includes: A motor (16) is fixedly mounted on a chassis (9). A bearing seat (17) is fixedly mounted on the upper surface of the chassis (9) at the output shaft end of the motor (16). A threaded rod (18) is coaxially connected to the bearing seat (17). A threaded block (19) is threadedly connected to the threaded rod (18), and the threaded block (19) slides with the chassis (9). The threaded block (19) is fixedly connected to a clamping plate (10). The output shaft of the motor (16) is coaxially connected to the threaded rod (18).

4. The ultra-small blind zone guided wave radar level gauge according to claim 3, characterized in that, The inner walls of the first clamp (10) and the second clamp (11) are both fixed with flexible clamps (12). The arc-shaped inner wall of the flexible clamp (12) is provided with a hemispherical protrusion, and the flexible clamp (12) is elastic.

5. The ultra-small blind zone guided wave radar level gauge according to claim 1, characterized in that, The connection component includes: A plug (20) is fixedly installed on the upper surface of the protective shell (6). A plug (20) is provided on the connecting plate (5) to accommodate the insertion of the plug (20). A storage groove (22) and a sliding groove (23) are respectively provided on the periphery of the connecting plate (5) near the socket (21). The storage groove (22) is located between the socket (21) and the sliding groove (23). A baffle (24) is slidably installed in the sliding groove (23). A spring (25) is provided on the side of the baffle (24) away from the socket (21). A pull rod (26) is slidably installed in the sliding groove (23), and one end of the pull rod (26) passes through the sliding groove (23). The inner wall of the sliding groove (23) extends into the baffle (24). The pull rod (26) is sleeved with the baffle (24). The pull rod (26) and the baffle (24) are welded and fixed at the sleeve position. A limit block (27) is fixed at one end of the pull rod (26) near the insertion hole (21). The cross-section of the limit block (27) is a right trapezoidal structure. The other end of the pull rod (26) passes through the inner wall of the sliding groove (23) and extends to the outside. A knob (28) is threaded to the end of the pull rod (26) located on the outside. A limit hole (29) is provided on the plug (20) to accommodate the insertion of the knob (28). The knob (28) is inserted into the limit hole (29).

6. The ultra-small blind zone guided wave radar level gauge according to claim 1, characterized in that, The bottom cover (7) has a circular hole at its center that allows the waveguide tube (8) to pass through, and the bottom cover (7) has evenly distributed ventilation holes on its periphery around the circular hole.

7. The ultra-small blind zone guided wave radar level gauge according to claim 1, characterized in that, The flexible cable (2) is fixedly installed at the bottom center of the level gauge body (1), and the probe (3) is fixedly installed at the end of the flexible cable (2) away from the level gauge body (1).

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