Rotary paddle level switch driven by electromagnet

Abstract

Provided in the present application is a rotary paddle level switch driven by an electromagnet. The rotary paddle level switch comprises a connector tube, a rotating shaft, an elastic sleeve, an electromagnet and an electronic module, wherein the rotating shaft runs through the connector tube and can rotate in the connector tube; the elastic sleeve is tightly fitted between the connector tube and the rotating shaft; a permanent magnet is provided on a side wall of one end of the rotating shaft, and a detection member is provided at the other end of the rotating shaft; and the electromagnet is arranged on one side of the permanent magnet, and is electrically connected to the electronic module. The rotary paddle level switch driven by an electromagnet provided in the embodiments of the present application uses a detection manner in which elastic rotation of a rotating shaft replaces slow rotation of blades of the rotary paddle level switch, and uses an elastic sleeve to seal the rotating shaft, such that dust can be prevented from entering the elastic sleeve and a connector tube, thereby avoiding the impact of dust and ensuring the reliability of the rotary paddle level switch driven by an electromagnet. Moreover, the elastic sleeve can also use its own elastic force to play a role in restoring the rotating shaft to an original position and generating elastic vibration when the rotating shaft is driven to rotate, thereby achieving a dual-purpose effect.

Description

A blocking-rotation type material level indicator driven by an electromagnet TECHNICAL FIELD

[0001] The present application relates to the technical field of material level sensors, and particularly relates to a blocking-rotation type material level indicator driven by an electromagnet. BACKGROUND

[0002] In industrial production, many material storage bins require measurement of material level, detection of empty bins or full bins, and currently commonly used material level indicators include blocking-rotation type material level indicators. The blocking-rotation type material level indicator is a material level controller for solid materials, and is widely used in the chemical, plastic, cement, pharmaceutical, feed, food and other industries. When the material level indicator is in operation, a motor drives a blade to rotate slowly, a transmission member on the motor is in constant contact with a micro switch, so that the motor remains in an open state. When the material level of the material rises, the rotation of the blade is blocked, and the motor generates a partial rotational displacement around the shaft. The displacement causes the transmission member to contact and separate from the micro switch, the micro switch is actuated to send a material signal, and simultaneously triggers another micro switch to de-energize the motor. When the material level drops, the blade is no longer blocked, the motor restores to the original state by relying on the spring tension, the transmission member re-contacts the micro switch, the micro switch sends a no-material signal, and simultaneously the motor is energized to continue rotating.

[0003] Since the blocking-rotation type material level indicator is based on the mode of the motor driving the blade to rotate slowly, in order to ensure that the rotation is not blocked, a gap must exist between the rotating shaft and the shaft hole. Solid materials are mostly dust or have dust, and the dust is scattered everywhere during the descending process, and is easy to enter the gap between the rotating shaft and the shaft hole or enter the interior of the blocking-rotation type material level indicator from the gap, thereby causing the material level indicator to fail.

[0004] Secondly, the blocking-rotation type material level indicator must de-energize the motor after detecting the material each time, and once the motor cannot be de-energized in time, the motor will be burned, so there is a risk of locked-rotor burning of the motor. At the same time, since the motor driving mode is adopted, a speed reducer and a transmission device are used, the mechanical structure is complex, and long-term continuous operation is easy to cause mechanical wear and even cause the motor to be stuck and burned. SUMMARY

[0005] The purpose of the present application is to overcome the above-mentioned defects of the prior art, and a blocking-rotation type material level indicator driven by an electromagnet is designed.

[0006] The technical problem to be solved by the present application can be solved by the following technical scheme: A blocking-rotation type material level indicator driven by an electromagnet, comprising a joint pipe, a rotating shaft, an elastic sleeve, an electromagnet and an electronic module; the rotating shaft is arranged in the joint pipe and can rotate in the joint pipe; the elastic sleeve is tightly sleeved between the joint pipe and the rotating shaft; a permanent magnet is arranged on the side wall of one end of the rotating shaft, and the other end of the rotating shaft has a detection member; the electromagnet is arranged on one side of the permanent magnet, and the electromagnet is electrically connected with the electronic module.

[0007] The application provides a rotation-preventing type material level detector driven by an electromagnet, which replaces the detection mode of slow rotation of a blade of the rotation-preventing type material level detector with elastic rotation of a rotating shaft, and seals the rotating shaft with an elastic sleeve, so that dust is prevented from entering the elastic sleeve and a joint pipe, the influence of dust is avoided, and the reliability of the rotation-preventing type material level detector driven by the electromagnet is ensured. In addition, the elastic sleeve can also utilize its own elasticity to restore the rotating shaft to the original position and generate elastic vibration when the rotating shaft is driven to rotate, thus achieving two purposes at one time.

[0008] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein a bearing is embedded in the joint pipe, and the rotating shaft is installed on the bearing.

[0009] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein the upper end of the elastic sleeve is tightly sleeved on the lower end of the joint pipe, and the lower end of the elastic sleeve is tightly sleeved on the outer wall of the rotating shaft.

[0010] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein the rotation-preventing type material level detector driven by the electromagnet further comprises a sleeve pipe, and the top end of the sleeve pipe is closed; the upper end of the joint pipe is connected to the lower end of the sleeve pipe, and the end of the rotating shaft provided with the permanent magnet and the permanent magnet are arranged in the sleeve pipe.

[0011] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein the electromagnet is located in a protection box, one end of the protection box is provided with a connecting plate, the connecting plate is provided with a first long waist hole, the top end of the sleeve pipe is provided with a fixing screw rod, the fixing screw rod penetrates through the first long waist hole and is connected with a nut.

[0012] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein the sleeve pipe is provided with a fixing plate on the outer wall, the fixing plate is perpendicular to the connecting plate, the fixing plate is provided with a second long waist hole, the other end of the protection box is provided with a connecting lug, the connecting lug is provided with a connecting through hole, the connecting through hole is opposite to the second long waist hole and is connected through a bolt.

[0013] In one possible implementation, the application provides a rotation-preventing type material level detector driven by an electromagnet, wherein the top end of the sleeve pipe is provided with a positioning key, and the positioning key is located in the first long waist hole.

[0014] In one possible implementation, the application provides a rotation blocking type material level detector driven by an electromagnet, wherein the detection member comprises a connecting part and a detection rope, one end of the connecting part is connected with the rotating shaft, and the other end of the connecting part is connected with the detection rope.

[0015] In one possible implementation, the application provides a rotation blocking type material level detector driven by an electromagnet, wherein the connecting part comprises a plurality of connecting rods and a plurality of connecting ropes, and two adjacent connecting rods are connected by one connecting rope.

[0016] In one possible implementation, the application provides a rotation blocking type material level detector driven by an electromagnet, wherein the number of the detection ropes is two, and the two detection ropes are cross-shaped.

[0017] The application has the following advantages: 1. The application uses an elastic sealing sleeve to eliminate the hidden danger of bearing dust.

[0018] 2. The application uses a non-visible driving mode of the electromagnet to eliminate the mechanical transmission shaft and the speed changing device in the prior art, thereby reducing the failure link, saving the parts and manufacturing cost, prolonging the service life of the equipment, and improving the safety and energy saving.

[0019] 3. The application can widely use a low-voltage safety isolation power supply of direct current 24V, and the power consumption is reduced by one order of magnitude compared with the prior art, which is safer, more energy-saving and more environmentally friendly.

[0020] 4. The electromagnet of the application does not need to be powered off at all when it is locked, and the power consumption at the locked state is the same as that at the idle state, which eliminates the hidden danger of burning the motor at the locked state in the prior art. 5. The electromagnet of the application is static sealed with the rotating shaft, can be pressure isolated, and has higher explosion-proof grade and protection grade compared with the rotating dynamic sealing of the motor in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 is a structural schematic diagram of a blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 2 is an enlarged schematic diagram of A in Fig. 1; Fig. 3 is a schematic diagram of an elastic sleeve in the blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 4 is a schematic diagram of a detection member in the blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 5 is a schematic diagram of a detection member in the blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 6 is a schematic diagram of a detection member in the blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 7 is a schematic diagram of a detection rope in the blocking-rotation type material level indicator driven by an electromagnet according to an embodiment of the present application; and Fig. 8 is an enlarged schematic diagram of B in Fig. 4.

[0023] Reference signs 10 - sleeve; 11 - shaft hole; 12 - fixed plate; 121 - second long kidney hole; 13 - fixed screw; 14 - positioning key; 20 - rotating shaft; 21 - detection member; 211 - connecting rod; 212 - connecting rope; 213 - detection rope; 30 - joint pipe; 40 - elastic sleeve; 41 - strip-shaped protrusion; 50 - bearing; 60 - permanent magnet; 70 - protection box; 71 - connecting lug; 72 - connecting plate; 721 - first long kidney hole; and 80 - electronic module. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, but not all of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, but cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0025] Fig. 1 is a structural schematic diagram of a rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 2 is an enlarged schematic diagram of A in Fig. 1; Fig. 3 is a schematic diagram of an elastic sleeve in the rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 4 is a schematic diagram of a detection member in the rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 5 is another schematic diagram of the detection member in the rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 6 is a third schematic diagram of the detection member in the rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; Fig. 7 is a schematic diagram of a detection rope in the rotation-preventing type material level indicator driven by an electromagnet according to an embodiment of the present application; and Fig. 8 is an enlarged schematic diagram of B in Fig. 4.

[0026] Referring to Figs. 1-8, the present application provides a rotation-preventing type material level indicator driven by an electromagnet, which comprises a joint pipe 30, a rotating shaft 20, an elastic sleeve 40, an electromagnet and an electronic module 80, wherein the rotating shaft 20 is arranged in the joint pipe 30 and can rotate in the joint pipe 30, the upper end of the elastic sleeve 40 is tightly sleeved on the lower end of the joint pipe 30, and the lower end of the elastic sleeve 40 is tightly sleeved on the outer wall of the rotating shaft 20. The elastic sleeve 40 mainly plays two roles, one is to seal the rotating shaft 20 so that dust cannot enter the elastic sleeve 40 and the joint pipe 30 through the gap between the elastic sleeve 40 and the rotating shaft 20, thereby playing a dustproof role; the other is that the elastic sleeve 40 plays a resetting role, when the rotating shaft 20 is periodically rotated by being driven, the elastic force of the elastic sleeve 40 makes the rotating shaft 20 return to the original position.

[0027] One side wall of one end of the rotating shaft 20 is provided with a permanent magnet 60, and the other end of the rotating shaft 20 is provided with a detection member 21; the electromagnet is arranged on one side of the permanent magnet 60 and close to the permanent magnet 60, and the electromagnet is electrically connected with the electronic module 80.

[0028] Working principle: when not powered, the electromagnet, elastic sleeve 40, shaft 20 and permanent magnet 60 are in the initial equilibrium position, when the electronic module 80 provides periodic pulse current to the electromagnet, the electromagnet generates a pulse electromagnetic field, thereby periodically driving the permanent magnet 60 to move, thereby driving the shaft 20 to rotate and making the elastic sleeve 40 produce torsional deformation, when the pulse electromagnetic field disappears, the elastic sleeve 40 will produce a springback force to make the shaft 20 turn to the initial equilibrium position and produce elastic vibration, due to the existence of friction, air resistance and other factors, the amplitude gradually weakens, and finally stops at the initial equilibrium position and is driven to rotate again for the next time, and so on. When the shaft 20 rotates, the permanent magnet 60 causes the magnetic flux passing through the electromagnet to change, thereby inducing a corresponding voltage signal, the polarity, amplitude, width, phase, frequency and other parameters of the induced voltage signal correspond to the direction, speed, amplitude and frequency of the rotation of the shaft 20. In the case that there is no material in the detection object container, the shaft 20 always repeatedly performs the same rotating action, when the material in the container gradually increases, the material will contact the detection piece 21 and hinder the movement of the detection piece 21, thereby affecting the rotation of the shaft 20, so that the voltage signal changes, thereby detecting the material in the container.

[0029] It can be understood that the damping of the detection piece 21 in the three types of media of gas, liquid and solid is obviously different, the damping in the gas medium is the smallest and can be ignored, the induced voltage signal is the strongest, the damping in the liquid medium is in the middle, the shaft 20 rotates slower than in the gas medium, and there is some hysteresis, so the phase of the induced voltage signal lags behind, the amplitude, frequency, duration and the like are reduced, and the damping in the solid is the largest so that the shaft 20 cannot rotate and no voltage signal is induced. Therefore, the electronic module 80 can judge the presence or absence of solid or liquid medium by receiving and judging the strength of the voltage signal, and output for indication, alarm, automatic control and the like.

[0030] The blocking spin type level detector driven by the electromagnet of the present application replaces the slow rotation detection mode of the blocking spin type level detector blade with the elastic rotation of the shaft 20, and seals the shaft 20 with the elastic sleeve 40, which can avoid dust entering the elastic sleeve 40 and the joint pipe 30, avoid the influence of dust, and ensure the reliability of the blocking spin type level detector driven by the electromagnet. Moreover, the elastic sleeve 40 can also use its own elastic force to restore the shaft 20 to the original position and produce elastic vibration when the shaft 20 is driven to rotate, which has the effect of killing two birds with one stone.

[0031] Specifically, the electronic module 80 comprises a power supply circuit, a pulse generating circuit, a pulse driving circuit, a signal amplification circuit, a signal processing circuit, a signal delay output circuit, the pulse generating circuit is connected with the pulse driving circuit, the pulse driving circuit is connected with the coil on the electromagnet, the coil is connected with the signal amplification circuit, the signal amplification circuit is connected with the signal processing circuit, the signal processing circuit is connected with the signal delay output circuit, the power supply circuit is connected with each of the above circuits, and the signal delay output circuit is connected with the power supply circuit. The electromagnet has a driving function and a signal acquisition function, and the permanent magnet is located on one side of the electromagnet in the absence of material blockage. After power-on, the pulse generating circuit generates a pulse signal and delivers it to the pulse driving circuit to control the periodic pulse current flowing in the coil of the electromagnet, so that the electromagnet generates a pulse electromagnetic field, and the pulse electromagnetic field drives the rotating shaft 20 to rotate. When the rotating shaft 20 rotates, the voltage signal generated by the electromagnet caused by the permanent magnet 60 is amplified by the signal amplification circuit and input to the signal processing circuit. The signal processing circuit can determine the presence or absence of solid or liquid medium according to the significant difference in amplitude or phase of the voltage signal induced by the electromagnet when the detection piece 21 rotates in the three types of medium of gas, liquid and solid, and input the object position signal to the signal delay output circuit for indication, alarm, automatic control, etc. after a certain time delay.

[0032] Referring to FIG. 2, specifically, in order to make the rotating shaft 20 rotate more smoothly, the bearing 50 is embedded in the joint pipe 30, and the rotating shaft 20 is installed on the bearing 50 and fixed by the bearing 50. A plurality of strip-shaped protrusions 41 are also arranged on the outer peripheral wall of the elastic sleeve 40, which are arranged along the length direction of the elastic sleeve 40 and uniformly distributed on the outer periphery of the elastic sleeve 40. The strip-shaped protrusions 41 can increase the strength of the elastic sleeve 40, reduce fatigue damage when the elastic sleeve 40 performs periodic reset action, and make the elastic sleeve 40 more durable.

[0033] Specifically, the material of the elastic sleeve 40 can be various elastic materials, for example, silicon rubber can be used as the material for making the elastic sleeve 40. The silicon rubber has good elasticity and mechanical properties, is moisture-proof and mildew-proof, and is resistant to chemical corrosion, which is one of the ideal materials for the elastic sleeve 40.

[0034] Referring to Fig. 2, in the embodiment of the present application, the rotation-preventing type material level detector driven by the electromagnet further comprises a sleeve 10, which plays a role of protection and sealing isolation. The lower end of the sleeve 10 is connected with the upper end of a joint pipe 30, and the upper end of the rotating shaft 20, the permanent magnet 60 and the like are arranged in the sleeve 10. The lower end of the joint pipe 30 is provided with a threaded joint or a flange joint for field installation and fixation. The top end of the sleeve 10 is closed, and the bottom end of the sleeve 10 is provided with a shaft hole 11, which is communicated with the joint pipe 30. The end of the rotating shaft 20, which is provided with the permanent magnet 60, is close to the top end of the sleeve 10, and the end of the rotating shaft 20, which is provided with the detection member 21, extends out of the joint pipe 30 through the shaft hole 11.

[0035] Referring to Fig. 2, in the embodiment of the present application, the electromagnet is located in a protection box 70, and one end of the protection box 70 is provided with a connecting plate 72. The connecting plate 72 is provided with a first long waist hole 721, and the top end of the sleeve 10 is provided with a fixing screw rod 13, which penetrates through the first long waist hole 721 and is fixed by a nut. In this way, the protection box 70 can be fixed in two perpendicular directions, so that the protection box 70 is not only convenient to adjust but also fixed more firmly.

[0036] The outer wall of the sleeve 10 is provided with a fixing plate 12, the connecting plate 72 is perpendicular to the fixing plate 12, and the fixing plate 12 is provided with a second long waist hole 121. The other end of the protection box 70 is provided with a connecting lug 71, which is provided with a connecting through hole. The connecting through hole is opposite to the second long waist hole 121 and is connected by a bolt. In this way, the distance between the protection box 70 and the sleeve 10, that is, the distance between the electromagnet and the permanent magnet 60, can be adjusted through the second long waist hole 121. The size of the electromagnetic driving force and the monitoring sensitivity can be adjusted by adjusting the distance. Since the electromagnet is isolated from the inside of the storage bin by two isolation barriers of the protection box 70 and the sleeve 10, the 20-zone explosion-proof requirement can be easily met.

[0037] Referring to Fig. 8, in the embodiment of the present application, the fixing plate 12 and the connecting lug 71 can be omitted, and a positioning key 14 is arranged at the top end of the sleeve 10. The positioning key 14 is located in the first long waist hole 721, so that the rotation of the connecting plate 72 can be limited through the first long waist hole 721. Moreover, only the fixing screw rod 13 needs to be fixed by a nut, so that the installation is more convenient and suitable for installation in some narrow positions.

[0038] Referring to Fig. 1, in the embodiment of the present application, the detection member comprises a connecting portion and a detection rope 213. One end of the connecting portion is connected with the rotating shaft 20, and the other end of the connecting portion is connected with the detection rope 213. The detection rope 213 can be connected with the connecting portion in various angular modes, such as V-shaped or L-shaped. The detection rope 213 can be flexibly deformed, so it can be installed through a small-diameter installation hole in the field and is not easy to pull out of a small cavity to cause false signal.

[0039] The structure of the connecting part includes three kinds, the first kind of connecting part structure is a single connecting rod 211 (Figure 1) or a single connecting rope (Figure 4). The second kind of connecting part structure is composed of connecting rod 211 and connecting rope 212 (Figure 5), so that the connecting part can be deformed by the connecting rope 212, so as not to be permanently deformed and recoverable when subjected to material extrusion, which can avoid the damage of the detection piece 21, and also reduce the force transmission to the structure in the sleeve 10. The third kind is composed of multiple connecting rods 211 and multiple connecting ropes 212 (Figure 6), two adjacent connecting rods 211 are connected by a connecting rope 212, which can effectively extend the length of the detection piece 21, suitable for long insertion depth of the anti-rotation detection, and can achieve the effect of folding storage by bending the connecting rope 212 of each part.

[0040] Referring to Figure 7, the number of detection ropes 212 can also be two, and the two detection ropes 212 are arranged in a cross shape, which can increase the contact area with the material, and is more suitable for detecting very light powder.

[0041] In the description of the embodiments of the present application, it should be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the present application. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specified.

[0042] The terms "first", "second", "third", "fourth", and the like in the description and in the claims of the present application and above depicted figures are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of these terms herein is to be construed as interchangeable in order to describe the embodiments of the present application that are depicted in the drawings and illustrated herein. For example, a process, method, object, or device that is described as including a first element can include a second element instead of the first element or in addition to the first element. Further, the terms "comprise", "comprising", "include", "including", and the like are to be construed in a non- limiting fashion as meaning that recited means or steps can be present or combined, or that recited steps, options or combinations thereof can be used, but are not a limitation of the process, method, object, or device. Further, the term "exemplary" is used in the sense(s) of serving as an example or illustration.

[0043] Finally, it should be noted that the above-mentioned embodiments merely illustrate the technical solutions of the present application, rather than limiting them. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions recorded in the above-mentioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalent replacements. Such modifications or replacements do not cause the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A screw blocking level indicator driven by an electromagnet, characterized in that, The joint pipe, the rotating shaft, the elastic sleeve, the electromagnet and the electronic module are included. The rotating shaft is arranged in the joint pipe and can rotate in the joint pipe. The side wall of one end of the rotating shaft is provided with a permanent magnet, and the other end of the rotating shaft is provided with a detection member.

2. A screw block level by electromagnet drive according to claim 1, characterized in that The electromagnet is arranged on one side of the permanent magnet and is electrically connected with the electronic module.

3. A choke level gauge driven by an electromagnet according to claim 2, characterized in that The bearing is arranged in the joint pipe, and the rotating shaft is arranged on the bearing.

4. A screw-block leveler driven by an electromagnet according to any one of claims 1 to 3, characterized in that, The upper end of the elastic sleeve is sleeved on the lower end of the joint pipe, and the lower end of the elastic sleeve is sleeved on the outer wall of the rotating shaft. The anti-rotation type material level indicator driven by the electromagnet further comprises a sleeve pipe, and the top end of the sleeve pipe is closed.

5. A screw block level by electromagnet drive according to claim 4, characterized in that The upper end of the joint pipe is connected with the lower end of the sleeve pipe, and the end of the rotating shaft provided with the permanent magnet and the permanent magnet are arranged in the sleeve pipe. The electromagnet is arranged in the protection box, and one end of the protection box is provided with a connecting plate.

6. A screw block level by electromagnet drive according to claim 5, characterized in that The first long waist hole is arranged on the connecting plate, the top end of the sleeve pipe is provided with a fixing screw rod, the fixing screw rod penetrates through the first long waist hole and is connected with a nut. The sleeve pipe is provided with a fixing plate on the outer wall, the fixing plate is perpendicular to the connecting plate, and the fixing plate is provided with a second long waist hole.

7. The choke level gauge driven by an electromagnet according to claim 5, characterized in that, The other end of the protection box is provided with a connecting lug, the connecting lug is provided with a connecting through hole, the connecting through hole is opposite to the second long waist hole and is connected through a bolt.

8. The choke level gauge driven by an electromagnet according to claim 4, characterized in that, The top end of the sleeve pipe is provided with a positioning key, and the positioning key is arranged in the first long waist hole.

9. A choke level indicator driven by an electromagnet according to claim 8, characterized in that The detection member comprises a connecting part and a detection rope, one end of the connecting part is connected with the rotating shaft, and the other end of the connecting part is connected with the detection rope.

10. The choke level gauge driven by an electromagnet according to claim 7, characterized in that, The connecting part comprises a plurality of connecting rods and a plurality of connecting ropes, and two adjacent connecting rods are connected through one connecting rope. The number of the detection ropes is two, and the two detection ropes are cross-shaped.

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