CN217083641U

CN217083641U - Mining intrinsic safety type displacement sensor

Info

Publication number: CN217083641U
Application number: CN202123244768.8U
Authority: CN
Inventors: 逄志明; 刘骏
Original assignee: Shandong Tuoxin Electric Co ltd
Current assignee: Shandong Tuoxin Electric Co ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-07-29
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses a mining intrinsic safety type displacement sensor, which comprises a shell, a sensor arranged in the shell and a piston rod; the shell comprises an ear seat, a cylinder body connected with the ear seat, a cylinder cover connected with the cylinder body and a waterproof joint arranged on the ear seat; the sensor is a magnetostrictive sensor and is arranged on the ear seat, and a cable of the sensor penetrates through the waterproof connector; the piston rod extends into the cylinder body, one end of the piston rod is connected with the sensor, the other end of the piston rod penetrates through the cylinder cover, and a sealing ring is arranged at the joint of the cylinder cover and the piston rod. The mining intrinsic safety type displacement sensor provided by the utility model adopts a non-contact absolute position measuring mode of the magnetostrictive principle, so that the service life of the sensor is not reduced and the precision is not reduced due to friction, and the sensor is not easily affected by oil stains, solution, dust or other pollution; and a waterproof joint and a dustproof sealing ring are additionally arranged, so that the protection grade is improved.

Description

Mining intrinsic safety type displacement sensor

Technical Field

The utility model relates to a displacement sensor technical field especially relates to a mining ann's type displacement sensor for colliery is equipment in pit.

Background

The displacement is a quantity related to the movement of the position of the object during the movement, and the range involved in the manner of measuring the displacement is rather wide. The displacement sensor is also called as a linear sensor, and is a metal-induced linear device, and the sensor is used for converting various measured physical quantities into electric quantities.

The mining displacement sensor is a device for continuously monitoring the relative position displacement of a measured object in a coal mine, most of the existing mining displacement sensors adopt a contact type absolute position measurement mode, and the abrasion of the sensors can be caused by friction, so that the service life of the mining displacement sensor is shortened, the precision of the mining displacement sensor is reduced, meanwhile, the existing mining displacement sensor is poor in waterproof and dustproof effect, and the protection grade is low, so that increasingly harsh use requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mining ann's type displacement sensor adopts contact measurement to lead to the easy wearing and tearing of sensor and the low problem of protection level in order to solve among the prior art.

In order to achieve the above object, the present invention provides the following technical solutions: a mining intrinsic safety type displacement sensor comprises a shell, a sensor arranged in the shell and a piston rod; the shell comprises an ear seat, a cylinder body connected with the ear seat, a cylinder cover connected with the cylinder body and a waterproof joint arranged on the ear seat; the sensor is a magnetostrictive sensor and is arranged on the ear seat, and a cable of the sensor penetrates through the waterproof connector; the piston rod extends into the cylinder body, one end of the piston rod is connected with the sensor, the other end of the piston rod penetrates through the cylinder cover, and a sealing ring is arranged at the joint of the cylinder cover and the piston rod.

According to the utility model discloses an embodiment, the sensor is including locating detecting element on the ear seat and cover are located magnetic ring on the detecting element, the magnetic ring is located the tip of piston rod.

According to an embodiment of the present invention, the sensor further comprises a gland provided between the detection element and the magnetic ring.

According to an embodiment of the present invention, the housing further comprises a bearing seat connected with the ear seat.

According to an embodiment of the present invention, the lug is screwed to the cylinder.

According to the utility model discloses an embodiment, the cylinder body with cylinder cap threaded connection.

According to an embodiment of the present invention, the cylinder body is provided with a grease nipple for injecting grease.

According to an embodiment of the invention, the outside of the piston rod is provided with a plurality of support rings.

According to an embodiment of the present invention, the support ring is a phenolic and cloth support ring.

According to an embodiment of the present invention, the support ring is provided at both ends of the piston rod, respectively.

Compared with the prior art, the utility model provides a mining ann's type displacement sensor has following advantage:

the mining intrinsic safety type displacement sensor provided by the utility model adopts a non-contact absolute position measuring mode of the magnetostrictive principle, so that the service life of the sensor is not reduced and the precision is not reduced due to friction, and the sensor is not easily affected by oil stains, solution, dust or other pollution; and meanwhile, a waterproof joint and a dustproof sealing ring are additionally arranged, so that the protection grade of the mining intrinsic safety type displacement sensor is improved and is not lower than IP 65.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:

fig. 1 is a schematic perspective view of a mining intrinsically safe displacement sensor according to a preferred embodiment of the present invention;

FIG. 2 is a top view of the mining intrinsically safe displacement sensor of FIG. 1;

FIG. 3 is a cross-sectional view of the intrinsically safe displacement sensor of FIG. 2 taken along line A-A;

FIG. 4 is an enlarged view of portion B of the intrinsically safe displacement sensor of FIG. 3;

FIG. 5 is an enlarged view of portion C of the intrinsically safe displacement sensor of FIG. 3;

fig. 6 is an enlarged view of portion D of the intrinsically safe displacement sensor shown in fig. 3.

Reference numerals:

the device comprises a shell 1, an ear seat 11, a cylinder 12, a grease nozzle 121, a cylinder cover 13, a sealing ring 131, a waterproof joint 14, a bearing seat 15, a sensor 2, a detection element 21, a magnetic ring 22, a gland 23, a piston rod 3 and a support ring 31.

Detailed Description

The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific examples described in the following embodiments of the present invention are merely illustrative of specific embodiments of the present invention and do not constitute limitations on the scope of the invention.

The invention is further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 and fig. 3, wherein fig. 1 is a schematic perspective view of a mining intrinsically safe displacement sensor according to a preferred embodiment of the present invention; FIG. 2 is a top view of the mining intrinsically safe displacement sensor of FIG. 1; fig. 3 is a cross-sectional view of the mining intrinsically safe displacement sensor shown in fig. 2 along the line a-a.

The embodiment provides a mining intrinsic safety type displacement sensor, which is used for underground equipment of a coal mine and continuously monitoring the relative position displacement of a measured object.

The mining intrinsic safety type displacement sensor comprises a shell 1, a sensor 2 arranged in the shell 1 and a piston rod 3; the shell 1 comprises an ear seat 11, a cylinder body 12 connected with the ear seat 11, a cylinder cover 13 connected with the cylinder body 12, and a waterproof joint 14 arranged on the ear seat 11; the sensor 2 is a magnetostrictive sensor and is arranged on the ear seat 11, and a cable of the sensor 2 penetrates through the waterproof connector 14; the piston rod 3 extends into the cylinder body 12, one end of the piston rod is connected with the sensor 2, the other end of the piston rod penetrates through the cylinder cover 13, and a sealing ring 131 is arranged at the joint of the cylinder cover 13 and the piston rod 3.

The mining intrinsic safety type displacement sensor provided by the application adopts a non-contact absolute position measuring mode of a magnetostrictive principle, the service life of the sensor is not reduced, the precision is not reduced due to friction, and the sensor is not easily affected by oil stains, solution, dust or other pollution; and meanwhile, a waterproof joint and a dustproof sealing ring are additionally arranged, so that the protection grade of the mining intrinsic safety type displacement sensor is improved and is not lower than IP 65.

This ampere indicates: the intrinsic safety, by limiting the energy in the electrical circuit and cooperating with the structural design of the electrical equipment, makes it impossible to create points in the circuit that meet the ignition source requirements under both normal and accident conditions.

The intrinsic safety type: intrinsically safe, according to the regulation of GB 3836.4-2010, refers to an explosion-proof version of an electrical device that limits the energy of electrical sparks or thermal effects that may be generated inside the device and by connecting wires exposed to potentially explosive environments, to levels that do not produce ignition.

The shell 1 is a main body structure of the mining intrinsic safety type displacement sensor, according to one embodiment of the utility model, the shell 1 further comprises a bearing seat 15 connected with the lug seat 11, the bearing seat 15 is fixed on the lug seat 11 through threads and is locked by rotating a corresponding nut, and the structure is simple, the connection is convenient, and the fixing effect is good; of course, in other embodiments, the bearing seat 15 and the ear seat 11 may also be fixedly connected by other methods, such as welding, screw connection, clamping, hinging, and other connection methods, and are flexible and changeable.

The other end of the ear seat 11 is fixedly connected with the cylinder body 12, according to one embodiment of the utility model, the ear seat 11 is connected with the cylinder body 12 by screw thread, the structure is simple, the connection is convenient, and the fixing effect is good; of course, in other embodiments, the bearing seat 15 and the ear seat 11 may also be fixedly connected by other methods, such as welding, screw connection, clamping, hinging, and other connection methods, and are flexible and changeable.

The other end of the cylinder body 12 is fixedly connected with the cylinder cover 13, according to one embodiment of the utility model, the cylinder body 12 is in threaded connection with the cylinder cover 13, the structure is simple, the connection is convenient, and the fixing effect is good; of course, in other embodiments, the cylinder body 12 and the cylinder cover 13 may also be fixedly connected by other manners, such as welding, screw connection, clamping, hinging, and other connection manners, which are flexible and changeable.

In this embodiment, the bearing seat 15 and the ear seat 11, the ear seat 11 and the cylinder body 12, and the cylinder body 12 and the cylinder cover 13 are all connected by a screw thread, and of course, in other embodiments, some of the above components may be connected by a screw thread, or all of them may not be connected by a screw thread, and all of them may be adjusted accordingly according to actual situations.

The cylinder body 12 is made of hardened and tempered 40Cr, 40Cr is a GB standard steel grade in China, and 40Cr steel is one of the most widely used steels in the mechanical manufacturing industry. After quenching and tempering, the alloy has good comprehensive mechanical property, good low-temperature impact toughness and low notch sensitivity. The steel has good hardenability, can be quenched to phi 28-60 mm during water quenching, and can be quenched to phi 15-40 mm during oil quenching. The cylinder body made of hardened and tempered 40Cr can improve the yield strength of products, thereby improving the reliability and overcoming the problems that the prior cylinder body made of common carbon steel has lower yield strength and is easy to be acted by external force in the using process so as to generate permanent deformation.

As shown in fig. 4, fig. 4 is an enlarged view of a portion B of the mining intrinsic safety type displacement sensor shown in fig. 3.

The cylinder cap 13 its with the junction of piston rod 3 is equipped with sealing washer 131, sealing washer 131 is mining dustproof sealing washer, installs on cylinder cap 13, piston rod 3 runs through sealing washer 131 prevents and scrapes dust, filth, sand grain and the fines on the piston rod, plays the guard action to sealing member and guide element to the life of extension sealing member is suitable for and exposes in the atmosphere for a long time, and operational environment dust is many, the abominable reciprocating motion of doing of condition. Has better weather aging resistance, good wear resistance, higher tearing strength and smaller friction coefficient. Of course, in other embodiments, the sealing ring 131 may also be in other forms, such as a sealing strip, which may be a silicone sealing ring, or a rubber sealing ring.

Additionally arranging the sealing ring 131, from a dustproof angle, improving the Protection grade of the mining intrinsic safety type displacement sensor to be not lower than IP65, wherein IP is an abbreviation of Ingress Protection, and the IP grade is the Protection grade aiming at the invasion of foreign matters by the shell of the electrical equipment, such as: the explosion-proof electric appliance, waterproof dustproof electric appliance, the source is international electrotechnical commission standard IEC 60529. The reference numeral 6 in IP65 indicates a contact protection and foreign matter protection level, i.e., a dust protection level, completely preventing dust from entering, and the reference numeral 5 indicates a water protection level, and low-pressure spray at any angle has no influence.

The waterproof connector 14 is arranged on the ear seat 11, specifically is a 304 stainless steel waterproof connector, and serves as a connecting device for leading out a cable of the sensor 2 to achieve a waterproof effect; from the waterproof angle, the protection grade of the mining intrinsic safety type displacement sensor is improved to be not lower than IP 65. The 304 stainless steel contains more than 18 percent of chromium and more than 8 percent of nickel; high temp. resistance of 800 deg.C, good processing performance and high toughness.

As shown in fig. 5, fig. 5 is an enlarged view of a portion C of the mining intrinsic safety type displacement sensor shown in fig. 3.

According to an embodiment of the present invention, the sensor 2 comprises a detecting element 21 disposed on the ear seat 11 and a magnetic ring 22 disposed on the detecting element 21, wherein the magnetic ring 22 is disposed at the end of the piston rod 3.

The sensor 2 is a magnetostrictive sensor, the absolute position of the movable magnetic ring is accurately detected by an internal non-contact measurement and control technology to measure the actual displacement value of a detected product, the sensor can bear high temperature, high pressure and strong vibration, the sensor is widely applied to measurement and control of mechanical displacement at present, the stroke of the sensor can reach 3 meters or more, the nominal precision is 0.05 percent F.S, the precision of the sensor with the stroke of more than 1 meter can reach 0.02 percent F.S, the repeatability can reach 0.002 percent F.S, and the sensor has high precision and high reliability.

Specifically, the position is accurately measured by using the magnetostriction principle and generating a strain pulse signal through the intersection of two different magnetic fields. The detection element 21 is a waveguide tube, the sensitive element in the waveguide tube is made of special magnetostrictive material, the measuring process is that current pulse is generated in an electronic chamber of the sensor, the current pulse is transmitted in the waveguide tube, so that a circumferential magnetic field is generated outside the waveguide tube, when the magnetic field is intersected with a magnetic field generated by a movable magnetic ring 22 which is sleeved on the waveguide tube and changes in position, a strain mechanical wave pulse signal is generated in the waveguide tube under the action of magnetostriction, and the strain mechanical wave pulse signal is transmitted at a fixed sound speed and is detected by the electronic chamber quickly.

Since the transmission time of the strain mechanical wave pulse signal in the waveguide is proportional to the distance between the movable magnetic ring and the electronic chamber, the distance can be determined with high accuracy by measuring the time. Since the output signal is a true absolute value, rather than a proportional or amplified signal, there is no signal drift or value change, and no periodic re-scaling is required.

Because the movable magnetic ring used for determining the position is not in direct contact with the sensitive element, the sensor can be applied to extremely severe industrial environment, is not easily affected by oil stain, solution, dust or other pollution, and can be applied to high-temperature, high-pressure and high-oscillation environment. The output signal of the sensor is an absolute displacement value, so that data cannot be lost even if the power supply is interrupted and reconnected, and the data does not need to be re-zeroed. Because the sensitive element is non-contact, even if the detection is repeated, the sensor is not abraded, and the reliability of the detection can be greatly improved and the service life can be greatly prolonged.

According to an embodiment of the present invention, the sensor 2 further comprises a gland 23 disposed between the detection element 21 and the magnetic ring 22.

The detection element 21 of the sensor 2 is mounted with the ear seat 11, the magnetic ring 22 is sleeved on the detection element 21, the piston rod 3 penetrates through the cylinder cover 13, the gland 23, the magnetic ring 22 and the piston rod 3 are fixed together, and when the piston rod 3 and the cylinder body 12 generate relative displacement, the magnetic ring 22 and the detection element 21 of the sensor 2 generate relative displacement and calculate the moving distance of the object to be measured.

The piston rod 3 is a rod body made of hardened and tempered 40Cr, 40Cr is a GB standard steel grade in China, and 40Cr steel is one of the most widely used steels in the mechanical manufacturing industry. After quenching and tempering, the alloy has good comprehensive mechanical property, good low-temperature impact toughness and low notch sensitivity. The steel has good hardenability, can be quenched to phi 28-60 mm during water quenching, and can be quenched to phi 15-40 mm during oil quenching. The rod body made of hardened and tempered 40Cr can improve the yield strength of products, so that the reliability is improved, and the problems that the yield strength of the existing common carbon steel piston rod is low, and the piston rod is easy to be acted by external force in the using process to generate permanent deformation are solved.

As shown in fig. 6, fig. 6 is an enlarged view of a portion D of the mining intrinsically safe displacement sensor shown in fig. 3.

According to the utility model discloses an embodiment, the outside of piston rod 3 is equipped with a plurality of support rings 31, support ring 31 plays support, guide effect. Of course, in other embodiments, the piston rod 3 may also be supported and guided by other structures.

According to an embodiment of the present invention, the support ring 31 is a phenolic and cloth support ring. The phenolic cloth-sandwiched support ring is made up by using thermosetting linear phenolic resin as base material, using cotton fibre or other fibre and its fabric as reinforcing material and adding proper quantity of wear-resisting friction-reducing additive through a certain compounding process, and has the excellent characteristics of compression strength, hardness, heat distortion temp., impact resistance, self-lubricating wear-resisting property, etc.. The support ring using the phenolic aldehyde and the cloth has higher mechanical strength, wear resistance and smoothness, and can effectively prolong the service life.

According to an embodiment of the present invention, the support rings 31 are respectively disposed at both ends of the piston rod 3, and provide support and guiding function at both ends respectively. The distribution position and the number of the support rings 31 are adjusted according to actual requirements.

According to an embodiment of the present invention, the cylinder body 12 is provided with a grease nipple 121 for injecting grease. Specifically, the grease nipple 121 is a pressure filling oil cup, which is the simplest way of mechanical lubrication and plays a role in connection; the lithium-based lubricating grease is prepared from natural fatty acid (stearic acid or 12-hydroxystearic acid) lithium soap, thickened medium-viscosity mineral lubricating oil or synthetic lubricating oil, has better water resistance and higher dropping point, is injected into the cylinder body 12 through the grease nipple 121, is matched with the phenolic aldehyde and cloth support ring for use, and can be used in a working environment of-10 ℃ to 60 ℃.

In the above description of the present specification, the terms "fixed," "mounted," "connected," and the like are to be construed broadly unless otherwise explicitly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, it is for the purpose of facilitating the explanation of the invention and simplifying the description, and it is not intended to state or imply that the devices or elements involved must be in the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be interpreted or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim.

Claims

1. The mining intrinsic safety type displacement sensor is characterized by comprising a shell (1), a sensor (2) arranged in the shell (1) and a piston rod (3);

the shell (1) comprises an ear seat (11), a cylinder body (12) connected with the ear seat (11), a cylinder cover (13) connected with the cylinder body (12), and a waterproof joint (14) arranged on the ear seat (11);

the sensor (2) is a magnetostrictive sensor and is arranged on the ear seat (11), and a cable of the sensor (2) penetrates through the waterproof connector (14);

the piston rod (3) stretches into in the cylinder body (12), its one end with sensor (2) are connected, and the other end passes cylinder cap (13), cylinder cap (13) be equipped with sealing washer (131) in its junction with piston rod (3).

2. The intrinsically safe displacement sensor of claim 1, wherein the sensor (2) comprises a detection element (21) arranged on the ear seat (11) and a magnetic ring (22) arranged on the detection element (21), the magnetic ring (22) being arranged at an end of the piston rod (3).

3. A mining intrinsically safe displacement sensor as claimed in claim 2, characterized in that the sensor (2) further comprises a gland (23) arranged between the detection element (21) and the magnetic ring (22).

4. A mining intrinsically safe displacement sensor as claimed in claim 1, characterized in that the housing (1) further comprises a bearing block (15) connected with the ear block (11).

5. A mining intrinsically safe displacement sensor as claimed in claim 1, characterized in that the ear seat (11) is screwed to the cylinder (12).

6. The mining intrinsically safe displacement sensor of claim 1, wherein the cylinder block (12) is in threaded connection with the cylinder head (13).

7. The mining intrinsically safe displacement sensor of claim 1, wherein the cylinder (12) is provided with a grease nipple (121) for injecting grease.

8. A displacement sensor of the mining intrinsic safety type according to claim 1, characterized in that the outside of the piston rod (3) is provided with a plurality of support rings (31).

9. The mining intrinsically safe displacement sensor of claim 8, wherein the support ring (31) is a phenolic plus cloth support ring.

10. The mining intrinsic safety type displacement sensor according to claim 8, characterized in that the support rings (31) are respectively provided at both ends of the piston rod (3).