Magnetostrictive displacement sensor

Abstract

The utility model provides a magnetostrictive displacement sensor, which relates to the technical field of sensors and comprises an electronic bin, a first end face, a second end face, a third end face, a fourth end face, a fourth end face and a fifth end face, at least one part of the tail cover is arranged in the first opening and used for blocking the first opening, and the tail cover is provided with a second step structure and a third step structure; the wire pressing nail is in threaded connection with the tail cover; the cable penetrates through the wire pressing nail; the signal plate is arranged in the mounting cavity and is connected with the cable; the sensitive component is arranged in the mounting cavity; the position sensing assembly penetrates through the mounting cavity and extends out of the second end surface; the measuring rod is arranged on the second end surface and sleeves the position sensing assembly; and the annular magnet is movably sleeved on the measuring rod. According to the technical scheme of the utility model, when the magnetostrictive displacement sensor is installed, the second step structure and the third step structure can be matched with the step structures correspondingly arranged in the preformed holes, so that the installation precision is ensured, and the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a magnetostrictive displacement sensor. Background Art

[0002] Magnetostrictive displacement sensors are usually installed inside oil cylinders, and their measurement accuracy is closely related to the installation accuracy. How to improve the structure of magnetostrictive displacement sensors to improve installation accuracy and thus improve measurement accuracy has always been a key concern of technical personnel in this field. Utility Model Content

[0003] In order to solve or improve the technical problem of low installation precision, one object of the utility model is to provide a magnetostrictive displacement sensor.

[0004] To achieve the above purpose, the utility model provides a magnetostrictive displacement sensor, including an electronic compartment, a tail cover, a wire pressing nail, a cable, a signal board, a sensitive component, a position sensing component, a measuring rod and a ring magnet.

[0005] An installation cavity is provided inside the electronic compartment. The electronic compartment has a first end face and a second end face arranged opposite to each other in a first direction. The first end face is provided with a first opening, and the first opening is connected to the installation cavity. At least a part of the tail cover is provided at the first opening, and the tail cover is used to block the first opening, and the tail cover and the electronic compartment are relatively fixed by welding.

[0006] The pressing nail is threadedly connected to the tail cover. The cable is passed through the pressing nail, and the cable is relatively fixed to the pressing nail.

[0007] The signal board is arranged in the installation cavity, and the signal board is connected with the cable. The sensitive component is arranged in the installation cavity, and the sensitive component is arranged on the side of the signal board away from the tail cover. The position sensing component is arranged on the side of the signal board away from the tail cover, and the position sensing component is arranged in the installation cavity and extends from the second end surface.

[0008] The measuring rod is arranged on the second end surface, the measuring rod is relatively fixed to the electronic compartment, and the measuring rod is sleeved on the part of the position sensing component extending out of the second end surface. The annular magnet is movably sleeved on the measuring rod.

[0009] The first end surface is also provided with a card slot, which is connected to the first opening and the installation cavity. The first slot wall of the card slot is connected to the first cavity wall of the installation cavity through a first connecting wall surface, and the first slot wall, the first connecting wall surface and the first cavity wall form a first step structure.

[0010] The tail cover includes a first part, a second part and a third part. The first part is arranged in the card slot. The first part has a third end face and a fourth end face arranged opposite to each other in the first direction, the fourth end face abuts against the first connecting wall face, the first side wall face of the first part abuts against the first groove wall, and the third end face is flush with the first end face. The second part is arranged on the third end face, and the second part and the first part form a second step structure. The third part is arranged at an end of the second part away from the first part, and the third part and the second part form a third step structure. The third part is provided with a first mounting groove, at least a part of the wire pressing nail is arranged in the first mounting groove, and the outer wall of the wire pressing nail is threadedly connected to the second groove wall of the first mounting groove. The first mounting groove is used to communicate with the mounting cavity so that the cable can be connected to the signal board. The first part, the second part and the third part are an integrated structure.

[0011] The first end surface is connected to the second side wall surface of the electronic compartment through a first chamfered surface. The end of the third part away from the second part has a fifth end surface, and the fifth end surface is connected to the third side wall surface of the third part through a third chamfered surface.

[0012] The second side wall surface is provided with at least two first limiting grooves, at least one of the first limiting grooves is provided with a sealing assembly, and the sealing assembly includes a retaining ring and an O-ring.

[0013] The utility model aims to provide a magnetostrictive displacement sensor. In the first aspect, a tail cover has at least two step structures. When a worker installs the magnetostrictive displacement sensor, the second step structure and the third step structure can cooperate with the step structure correspondingly arranged in the reserved hole to ensure the installation accuracy of the magnetostrictive displacement sensor, thereby improving the measurement accuracy. In the second aspect, since the electronic compartment adopts embedded installation, the sealing component can play a sealing role and can also play a role of installation positioning to a certain extent. In the third aspect, the first part of the tail cover is arranged in the card slot of the electronic compartment, and at least a part of the wire pressing nail is arranged in the first installation slot of the tail cover. This design method is conducive to improving the spatial layout and making the internal structure of the magnetostrictive displacement sensor more compact.

[0014] In addition, the above technical solution provided by the utility model may also have the following additional technical features:

[0015] In some technical solutions, the magnetostrictive displacement sensor may further include a gasket. The gasket is disposed in the first mounting groove. One end of the wire pressing nail extending into the first mounting groove is used to abut against the gasket, and one end of the cable can be passed through the gasket and connected to the signal board.

[0016] In this technical solution, by providing a gasket, after the staff tightens the wire pressing nail, the end of the wire pressing nail extending into the first installation groove does not need to directly contact the groove wall of the first installation groove, and the wire pressing nail abuts against the groove wall of the first installation groove through the gasket. This design method is conducive to increasing the area where the wire pressing nail abuts against the groove wall, and effectively reducing the wear of the end face of the wire pressing nail.

[0017] In some technical solutions, the magnetostrictive displacement sensor may further include a sealing ring, at least a portion of which is disposed between the wire pressing nail and the cable, and the sealing ring is used to abut against the gasket and the wire pressing nail.

[0018] In this technical solution, by providing a sealing ring, it is possible to achieve sealing between the cable, the wire pressing nail and the tail cover, and to prevent the cable from rotating relative to the wire pressing nail to a certain extent.

[0019] In some technical solutions, optionally, the magnetostrictive displacement sensor further includes a first shielding cover. The first shielding cover is arranged in the installation cavity, the first shielding cover is arranged on a side of the signal board away from the tail cover, and the sensitive component is arranged in the first shielding cover.

[0020] In this technical solution, by providing the first shielding cover, interference signals can be shielded, the internal circuit of the magnetostrictive displacement sensor can be protected, and external interference can be avoided.

[0021] In some technical solutions, the magnetostrictive displacement sensor may further include an insulating protective cover, which is disposed in the installation cavity, on a side of the signal board away from the tail cover, and between the first shielding cover and the first cavity wall.

[0022] In this technical solution, the insulating protective cover is used to isolate the sensitive components from the electronic compartment to prevent contact and conduction between the two.

[0023] In some technical solutions, the magnetostrictive displacement sensor may further include a shielding tube. The shielding tube is disposed between the measuring rod and the position sensing component. One end of the shielding tube extends into the installation cavity through the second end surface and abuts against the first shielding cover and the insulating protective cover.

[0024] In this technical solution, by providing a shielding tube, it can not only play a role in shielding interference signals, but also play a role in protecting the position sensing component to a certain extent.

[0025] In some technical solutions, optionally, a second mounting groove is provided on the second end surface, at least a portion of the measuring rod is provided in the second mounting groove, and the measuring rod is fixed to the second mounting groove by welding.

[0026] In this technical solution, by placing at least a portion of the measuring rod in the second mounting groove, it is beneficial to increase the contact area between the measuring rod and the electronic compartment, thereby improving the connection strength. The measuring rod is welded and fixed to the second mounting groove. This design method can ensure the installation accuracy between the measuring rod and the electronic compartment, thereby improving the measurement accuracy of the magnetostrictive displacement sensor.

[0027] In some technical solutions, the magnetostrictive displacement sensor may further include a magnetic gasket, which is disposed between the measuring rod and the annular magnet, and the magnetic gasket and the annular magnet are relatively fixed.

[0028] In this technical solution, the magnet gasket is used to isolate the annular magnet from its installation position (the installation position of the annular magnet on the measuring rod) to prevent magnetization at the installation position.

[0029] In some technical solutions, the magnetostrictive displacement sensor may further include a shielding tube cap, which is disposed at one end of the shielding tube away from the signal board and is used to block the second opening of the shielding tube.

[0030] In this technical solution, the shielding tube cap mainly serves to seal the second opening of the shielding tube, thereby protecting the position sensing component in the shielding tube.

[0031] In some technical solutions, the magnetostrictive displacement sensor may further include an end cap, which is disposed at an end of the measuring rod away from the signal plate and is used to block the third opening of the measuring rod.

[0032] In this technical solution, the end cap mainly serves to seal the third opening of the measuring rod, thereby protecting the internal components of the measuring rod.

[0033] Additional aspects and advantages of the technical solution of the present invention will become apparent in the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a magnetostrictive displacement sensor according to an embodiment of the utility model is shown;

[0035] Figure 2 A cross-sectional view of a magnetostrictive displacement sensor according to another embodiment of the present utility model is shown;

[0036] Figure 3 Shows Figure 2 A partial enlarged schematic diagram of part A;

[0037] Figure 4 A cross-sectional view of an electronic compartment according to an embodiment of the utility model is shown;

[0038] Figure 5A cross-sectional view of a tail cover according to an embodiment of the utility model is shown;

[0039] Figure 6 A schematic diagram of an electronic warehouse according to an embodiment of the utility model is shown;

[0040] Figure 7 A schematic diagram of an electronic warehouse according to another embodiment of the utility model is shown;

[0041] Figure 8 A schematic diagram of a tail cover according to an embodiment of the utility model is shown.

[0042] in, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names is as follows:

[0043] 100: magnetostrictive displacement sensor; 110: electronic compartment; 111: mounting cavity; 1111: first cavity wall; 112: first end face; 1121: first opening; 1122: slot; 1123: first slot wall; 113: second end face; 1131: second mounting slot; 114: second side wall; 1141: first limiting slot; 1142: second limiting slot; 115: first chamfered surface; 117: first connecting wall; 118: first step structure; 120: tail cover; 121: first part; 1211: third end face; 1212: fourth end face; 1213: first side wall; 122: second part; 123: third part; 1231: first mounting slot; 1232: fifth end face; 1233 : third side wall surface; 1234: third chamfered surface; 1235: disassembly thread; 1236: second groove wall; 124: second step structure; 125: third step structure; 131: wire pressing nail; 132: cable line; 141: signal board; 143: sensitive component; 144: position sensing component; 151: measuring rod; 1511: third opening; 152: annular magnet; 153: magnet gasket; 154: shielding tube; 1541: second opening; 155: shielding tube cap; 156: end cap; 161: sealing component; 1611: retaining ring; 1612: O-ring; 162: gasket; 163: sealing ring; 171: first shielding cover; 172: insulating protective cover; a: first direction; b: second direction. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0046] Refer to the following Figures 1 to 8 A magnetostrictive displacement sensor 100 provided according to some embodiments of the present invention is described.

[0047] In one embodiment according to the present invention, Figure 1 and Figure 2 As shown, the magnetostrictive displacement sensor 100 includes an electronic compartment 110 , a tail cover 120 , a wire pressing nail 131 , a cable 132 , a signal board 141 , a sensitive component 143 , a position sensing component 144 , a measuring rod 151 and a ring magnet 152 .

[0048] Among them, Figure 2 , Figure 3 , Figure 4 As shown, an installation cavity 111 is provided inside the electronic compartment 110 . Some components or devices of the magnetostrictive displacement sensor 100 (such as the signal board 141 and the sensitive component 143 , etc.) can be arranged in the installation cavity 111 .

[0049] like Figure 3 and Figure 4 As shown, the electronic chamber 110 has a first end face 112 and a second end face 113 that are arranged opposite to each other in the first direction a. In other words, the electronic chamber 110 has a first end and a second end that are arranged opposite to each other, and the first end and the second end are arranged opposite to each other in the first direction a; the first end of the electronic chamber 110 has a first end face 112, and the second end of the electronic chamber 110 has a second end face 113. Optionally, the first direction a is the length direction of the magnetostrictive displacement sensor 100.

[0050] like Figure 4 As shown, the first end surface 112 is provided with a first opening 1121, and the first opening 1121 is communicated with the installation cavity 111. At least a portion of the tail cover 120 is provided at the first opening 1121, and the tail cover 120 is used to block the first opening 1121. The tail cover 120 and the electronic compartment 110 are relatively fixed by welding.

[0051] By welding and fixing the tail cover 120 to the electronic compartment 110, on the one hand, the tail cover 120 and the electronic compartment 110 can form a relatively closed overall structure, which can effectively prevent external dust, moisture, corrosive gases or liquids from entering the electronic compartment 110, and to a large extent protect the electronic components inside the electronic compartment 110 (i.e., inside the installation cavity 111), thereby ensuring the reliability and stability of the magnetostrictive displacement sensor 100 and helping to extend its service life; on the other hand, this connection method can ensure that the tail cover 120 and the electronic compartment 110 remain tightly connected when subjected to external force impact, vibration or complex working environment (such as the strong vibration generated by the operation of mining equipment in coal mines), and will not become loose or misaligned, which is beneficial to improving the measurement accuracy of the magnetostrictive displacement sensor 100.

[0052] like Figure 3 and Figure 4 As shown, the first end surface 112 is further provided with a slot 1122, the slot 1122 is communicated with the first opening 1121, and the slot 1122 is communicated with the mounting cavity 111. The first slot wall 1123 of the slot 1122 is connected to the first cavity wall 1111 of the mounting cavity 111 through the first connecting wall surface 117. Specifically, the slot 1122 has the first slot wall 1123, the mounting cavity 111 has the first cavity wall 1111, and the first slot wall 1123 and the first cavity wall 1111 are connected through the first connecting wall surface 117. The first slot wall 1123, the first connecting wall surface 117 and the first cavity wall 1111 form a first step structure 118.

[0053] It should be noted that the first groove wall 1123, the first connecting wall surface 117 and the first cavity wall 1111 form a first step structure 118, that is, the card slot 1122 and the installation cavity 111 form a first step structure 118. In this design, when the staff performs preliminary installation of the tail cover 120, the first part 121 of the tail cover 120 is arranged in the first step structure 118 (the first part 121 is arranged in the card slot 1122, the fourth end surface 1212 of the first part 121 is against the first connecting wall surface 117, and the first side wall surface 1213 of the first part 121 is against the first groove wall 1123), so that the tail cover 120 can be quickly installed in place, which is convenient for welding the tail cover 120 and the electronic compartment 110 in subsequent processes, which is conducive to improving the installation accuracy of the tail cover 120 and making the structure of the magnetostrictive displacement sensor 100 more compact.

[0054] like Figure 3 , Figure 5 and Figure 8 As shown, the tail cover 120 includes a first portion 121 , a second portion 122 and a third portion 123 .

[0055] The first portion 121 is disposed in the slot 1122. When the tail cover 120 is initially installed, the first portion 121 is disposed in the slot 1122, so as to facilitate welding of the tail cover 120 and the electronic compartment 110 in subsequent processes.

[0056] It should be noted that, since the first portion 121 of the tail cover 120 is disposed in the slot 1122, the tail cover 120 mainly blocks the first opening 1121 through the first portion 121. The first portion 121 of the tail cover 120 and the electronic compartment 110 are relatively fixed by welding.

[0057] The first portion 121 has a third end surface 1211 and a fourth end surface 1212 that are disposed opposite to each other in the first direction a. In other words, the first portion 121 has a third end and a fourth end that are disposed opposite to each other, and the third end and the fourth end are disposed opposite to each other in the first direction a; the third end of the first portion 121 has the third end surface 1211, and the fourth end of the first portion 121 has the fourth end surface 1212.

[0058] When the first portion 121 is disposed in the slot 1122 , the fourth end surface 1212 abuts against the first connecting wall surface 117 , the first side wall surface 1213 of the first portion 121 abuts against the first slot wall 1123 , and the third end surface 1211 is flush with the first end surface 112 .

[0059] It should be emphasized that when the tail cover 120 is initially installed, the first portion 121 is disposed in the slot 1122, and the third end surface 1211 of the first portion 121 is flush with the first end surface 112 of the electronic compartment 110. This design facilitates welding of the tail cover 120 and the electronic compartment 110 in subsequent processes, which is conducive to improving welding accuracy, thereby improving the installation accuracy of the tail cover 120 and the measurement accuracy of the magnetostrictive displacement sensor 100.

[0060] The second portion 122 is disposed on the third end surface 1211. In other words, the second portion 122 is disposed at an end of the first portion 121 away from the installation cavity 111, and the second portion 122 is located outside the slot 1122. The second portion 122 and the first portion 121 form a second step structure 124.

[0061] It should be noted that the magnetostrictive displacement sensor 100 is usually arranged in the oil cylinder. Specifically, at least a portion of the electronic compartment 110 is arranged in the reserved hole of the oil cylinder, and at least a portion of the tail cover 120 is arranged in the reserved hole of the oil cylinder. By forming a second step structure 124 with the second portion 122 and the first portion 121, when the staff installs the magnetostrictive displacement sensor 100, the second step structure 124 can cooperate with the corresponding step structure arranged in the reserved hole, which is conducive to realizing the rapid installation of the magnetostrictive displacement sensor 100, improving the installation accuracy of the magnetostrictive displacement sensor 100, and further improving the measurement accuracy of the magnetostrictive displacement sensor 100.

[0062] Optionally, the size of the second portion 122 in the second direction b is smaller than the size of the first portion 121 in the second direction b, and the second direction b is perpendicular to the first direction a. Optionally, the second direction b is the width direction of the magnetostrictive displacement sensor 100. This design ensures that the second portion 122 and the first portion 121 form a second step structure 124, which facilitates the staff to quickly install the magnetostrictive displacement sensor 100.

[0063] Optionally, a dimension of the second portion 122 in the second direction b is one half to two thirds of a dimension of the first portion 121 in the second direction b.

[0064] The third portion 123 is disposed at one end of the second portion 122 away from the first portion 121. The third portion 123 is disposed outside the slot 1122. The third portion 123 and the second portion 122 form a third step structure 125.

[0065] It should be noted that, by forming a third step structure 125 with the third part 123 and the second part 122, when the staff installs the magnetostrictive displacement sensor 100, the third step structure 125 can cooperate with the corresponding step structure arranged in the reserved hole, which is conducive to the rapid installation of the magnetostrictive displacement sensor 100, further improving the installation accuracy of the magnetostrictive displacement sensor 100, and improving the measurement accuracy of the magnetostrictive displacement sensor 100.

[0066] The tail cover 120 has at least two step structures (a second step structure 124 and a third step structure 125). When the staff installs the magnetostrictive displacement sensor 100, the second step structure 124 and the third step structure 125 can cooperate with the corresponding step structures arranged in the reserved hole to ensure the installation accuracy of the magnetostrictive displacement sensor 100, thereby improving the measurement accuracy.

[0067] The first part 121, the second part 122 and the third part 123 are an integrated structure. Compared with the post-processing method, this design method has good mechanical properties and high connection strength, which is conducive to reducing the number of parts and improving assembly efficiency.

[0068] Optionally, the electronic compartment 110 includes a fourth part and a fifth part connected to each other. The fourth part is provided with a first cavity section, the fifth part is provided with a second cavity section, and the first cavity section and the second cavity section form an installation cavity 111. The first end surface 112 is the end surface of the fourth part away from the fifth part; the second end surface 113 is the end surface of the fifth part away from the fourth part. The cavity wall of the first cavity section is connected to the first groove wall 1123 of the slot 1122 through the first connecting wall surface 117.

[0069] Optionally, the fourth portion is a cylinder; the fifth portion is a cylinder. The size of the fourth portion in the second direction b is greater than the size of the fifth portion in the second direction b.

[0070] Optionally, the size of the fourth part in the second direction b is one-half to two-thirds of the size of the fifth part in the second direction b. The size of the fourth part in the first direction a is 1 to 2 times the size of the fifth part in the second direction b. By defining the size relationship between the fourth part and the fifth part, it is helpful to optimize the spatial layout of the electronic warehouse 110 and make the structure of the magnetostrictive displacement sensor 100 more compact.

[0071] like Figure 1 , Figure 2 and Figure 3 As shown, the pressing nail 131 is threadedly connected to the tail cover 120. The cable 132 is passed through the pressing nail 131, and the cable 132 is relatively fixed to the pressing nail 131. Specifically, the pressing nail 131 is threadedly connected to the third portion 123 of the tail cover 120.

[0072] like Figure 3 As shown, the third portion 123 is provided with a first mounting groove 1231. Optionally, the first mounting groove 1231 is provided at one end of the third portion 123 away from the second portion 122. At least a portion of the wire pressing nail 131 is provided in the first mounting groove 1231. The first mounting groove 1231 has a second groove wall 1236. The outer wall of the wire pressing nail 131 is threadedly connected to the second groove wall 1236 of the first mounting groove 1231. The first mounting groove 1231 is used to communicate with the mounting cavity 111 so that the cable 132 can be connected to the signal board 141.

[0073] It should be noted that the cable 132 is relatively fixed to the wire pressing nail 131, and the outer wall of the wire pressing nail 131 is threadedly connected to the second groove wall 1236. This design makes it convenient for the staff to disassemble and assemble the wire pressing nail 131 (just tighten or loosen the wire pressing nail 131), and the staff can disassemble and assemble the cable 132 while disassembling and assembling the wire pressing nail 131. The wire pressing nail 131 can be understood as a clamping screw.

[0074] like Figure 2 and Figure 3 As shown, the signal board 141 is disposed in the mounting cavity 111 .

[0075] Optionally, the magnetostrictive displacement sensor 100 further includes a first mounting seat, which is disposed in the mounting cavity 111, and the signal board 141 is disposed on the first mounting seat. In other words, the signal board 141 is connected to the electronic compartment 110 via the first mounting seat.

[0076] Optionally, the signal board 141 and the first mounting seat are detachably connected (such as snap-fitted), so that the staff can conveniently disassemble and assemble the signal board 141 .

[0077] The signal board 141 is connected to the cable 132. The cable 132 includes a plurality of wire harnesses, at least one of which is used for power supply, and at least one of which is used for receiving a data conversion signal from the signal board 141 and transmitting the data conversion signal to the control end in the form of an electrical signal.

[0078] like Figure 2 and Figure 3 As shown, the sensitive component 143 is disposed in the mounting cavity 111, and the sensitive component 143 is disposed on the side of the signal board 141 away from the tail cover 120. The sensitive component 143 is connected to the signal board 141. Optionally, the magnetostrictive displacement sensor 100 further includes a second mounting seat, the second mounting seat is disposed in the mounting cavity 111, and the sensitive component 143 is disposed on the second mounting seat. In other words, the sensitive component 143 is connected to the electronic compartment 110 through the second mounting seat.

[0079] Optionally, the sensitive component 143 and the second mounting seat are detachably connected (such as snap-on), so that the staff can easily disassemble and assemble the sensitive component 143 .

[0080] The second mounting seat is used to fix the sensitive component 143 to ensure accurate position measurement.

[0081] Optionally, the sensitive component 143 includes a coil, and the coil is connected to the signal board 141 .

[0082] The position sensing component 144 is disposed on a side of the signal board 141 away from the tail cover 120. The position sensing component 144 is connected to the signal board 141. The position sensing component 144 is disposed through the mounting cavity 111 and extends from the second end surface 113. In addition, the position sensing component 144 is also disposed through the sensitive component 143.

[0083] Optionally, the position sensing component 144 includes a waveguide wire. One end of the waveguide wire is connected to the signal board 141, and the waveguide wire is arranged on the side of the signal board 141 away from the tail cover 120. The waveguide wire is passed through the coil of the sensitive component 143 and the installation cavity 111, and the other end of the waveguide wire can extend from the second end surface 113.

[0084] It should be noted that the position sensing component 144 is used to sense the position of the annular magnet 152 and transmit the induced signal to the sensitive component 143. The sensitive component 143 is used to receive and convert the signal transmitted by the position sensing component 144. The signal board 141 is used to process the position signal and output it.

[0085] The measuring rod 151 is disposed on the second end surface 113 and is relatively fixed to the electronic compartment 110. The measuring rod 151 is sleeved on the portion of the position sensing component 144 extending from the second end surface 113. Optionally, the measuring rod 151 is sleeved on the portion of the waveguide extending from the electronic compartment 110 through the second end surface 113.

[0086] Optionally, the length direction of the measuring rod 151 is consistent with the length direction of the waveguide wire. Optionally, the length direction of the measuring rod 151 is consistent with the first direction a; the length direction of the waveguide wire is consistent with the first direction a.

[0087] like Figure 1 and Figure 2 As shown, the annular magnet 152 is movably mounted on the measuring rod 151. The annular magnet 152 can move relative to the measuring rod 151. Optionally, the annular magnet 152 is used to connect with the piston rod of the oil cylinder. During the movement of the piston rod of the oil cylinder, the relative position between the annular magnet 152 and the waveguide wire changes continuously. The magnetostrictive displacement sensor 100 can convert the displacement signal of the annular magnet 152 into an electrical signal, and transmit the electrical signal to the control end through the cable 132.

[0088] like Figure 3 and Figure 4 As shown, the electronic chamber 110 has a second side wall surface 114. The first end surface 112 is connected to the second side wall surface 114 of the electronic chamber 110 via a first chamfered surface 115. In other words, the edge of the first end surface 112 is chamfered to form the first chamfered surface 115, and the first chamfered surface 115 is used to connect the first end surface 112 and the second side wall surface 114.

[0089] The first chamfered surface 115 can effectively prevent the edge of the electronic compartment 110 from colliding with other components. In addition, when the staff installs the electronic compartment 110 and the tail cover 120 in the reserved hole, the first chamfered surface 115 can also play a guiding role to a certain extent.

[0090] like Figure 5 As shown, the end of the third portion 123 facing away from the second portion 122 has a fifth end surface 1232. The third portion 123 also has a third side wall surface 1233. The fifth end surface 1232 is connected to the third side wall surface 1233 of the third portion 123 through a third chamfered surface 1234. In other words, the edge position of the fifth end surface 1232 is chamfered to form the third chamfered surface 1234, and the third chamfered surface 1234 is used to connect the fifth end surface 1232 and the third side wall surface 1233.

[0091] The third chamfered surface 1234 can effectively prevent the edge of the tail cover 120 from colliding with other components. In addition, when the staff installs the electronic compartment 110 and the tail cover 120 in the reserved hole, the third chamfered surface 1234 can also play a guiding role to a certain extent.

[0092] like Figure 3 , Figure 4 and Figure 6 As shown, the second side wall surface 114 is provided with at least two first limiting grooves 1141. The number of the first limiting grooves 1141 is two or more, and the number of the first limiting grooves 1141 is flexibly set according to actual needs.

[0093] A sealing assembly 161 is disposed in at least one first limiting groove 1141 . The sealing assembly 161 includes a retaining ring 1611 and an O-ring 1612 .

[0094] According to actual needs, one set of sealing components 161 (retaining ring 1611 and O-ring 1612 ) or two sets of sealing components 161 may be provided.

[0095] The electronic compartment 110 of the magnetostrictive displacement sensor 100 is embedded in the installation (for example, embedded in a reserved hole of the oil cylinder). By providing a sealing component 161, it can play a sealing role and also play a role of installation positioning to a certain extent.

[0096] In a specific embodiment, there are two first limiting grooves 1141, each of which has a sealing assembly 161 therein, and the sealing assembly 161 includes a retaining ring 1611 and an O-ring 1612. It can be understood that a double sealing structure is adopted between the electronic compartment 110 and the reserved hole.

[0097] It should be noted that the double sealing structure uses two sealing grooves (first limiting groove 1141) and is fixed by axial compression, which is suitable for high-pressure environments. The high-pressure sealing of the magnetostrictive displacement sensor 100 can be achieved by using the retaining ring 1611 and the O-ring 1612 in combination.

[0098] In the sealing assembly 161, the retaining ring 1611 is arranged on the side of the O-ring 1612 away from the annular magnet 152. In other words, the retaining ring 1611 is arranged on the low-pressure side of the O-ring 1612 to reduce the gap of the O-ring 1612 on the low-pressure side, thereby improving the pressure bearing capacity.

[0099] Alternatively, if Figure 7 As shown, the second side wall surface 114 is provided with at least one second limiting groove 1142. The second limiting groove 1142 is used to abut against the ejector pin in the reserved hole. The ejector pin may be a screw. By changing the position of the ejector pin in the reserved hole, the second limiting groove 1142 is compressed. In this design, the magnetostrictive displacement sensor 100 is fixed by means of radial ejector pins.

[0100] It should be emphasized that the electronic compartment 110 of the magnetostrictive displacement sensor 100 is embedded and can be implemented in two forms: ejector type and double seal to meet the needs of different customers.

[0101] Alternatively, if Figure 8 As shown, the third side wall surface 1233 of the third part 123 is provided with a disassembly thread 1235. The third side wall surface 1233 is threadedly connected with the reserved hole through the disassembly thread 1235. This design method facilitates the staff to disassemble and assemble the magnetostrictive displacement sensor 100. In addition, it can also improve the installation accuracy of the magnetostrictive displacement sensor 100, thereby improving the measurement accuracy.

[0102] The utility model aims to provide a magnetostrictive displacement sensor 100. In the first aspect, the tail cover 120 has at least two step structures. When the staff installs the magnetostrictive displacement sensor 100, the second step structure 124 and the third step structure 125 can cooperate with the step structures correspondingly arranged in the reserved hole to ensure the installation accuracy of the magnetostrictive displacement sensor 100, thereby improving the measurement accuracy. In the second aspect, since the electronic compartment 110 adopts embedded installation, the sealing component 161 can not only play a sealing role, but also play a role in installation and positioning to a certain extent. In the third aspect, the first part 121 of the tail cover 120 is arranged in the card slot 1122 of the electronic compartment 110, and at least a part of the wire pressing nail 131 is arranged in the first installation slot 1231 of the tail cover 120. This design method is conducive to improving the spatial layout and making the internal structure of the magnetostrictive displacement sensor 100 more compact.

[0103] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the magnetostrictive displacement sensor 100 further includes a gasket 162. The gasket 162 is disposed in the first mounting groove 1231. One end of the wire pressing nail 131 extends into the first mounting groove 1231 to abut against the gasket 162, and one end of the cable 132 can be passed through the gasket 162 and connected to the signal board 141.

[0104] By providing the gasket 162, after the staff tightens the wire pressing nail 131, the end of the wire pressing nail 131 extending into the first installation groove 1231 does not need to directly contact the groove wall of the first installation groove 1231, and the wire pressing nail 131 abuts against the groove wall of the first installation groove 1231 through the gasket 162. This design method is conducive to increasing the area where the wire pressing nail 131 abuts against the groove wall, and effectively reduces the wear of the end face of the wire pressing nail 131.

[0105] It should be noted that the wire pressing nail 131 can tighten the cable 132 and achieve sealing when the cable 132 is assembled.

[0106] Optionally, the gasket 162 is placed between the tail cover 120 and the sealing ring 163, and the auxiliary wire pressing nail 131 locks the cable 132 and prevents the cable 132 from rotating during the locking process.

[0107] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the magnetostrictive displacement sensor 100 further includes a sealing ring 163 . At least a portion of the sealing ring 163 is disposed between the wire pressing nail 131 and the cable 132 , and the sealing ring 163 is used to abut against the gasket 162 .

[0108] By providing the sealing ring 163 , it is possible to achieve sealing between the cable 132 , the wire pressing nail 131 and the tail cover 120 , and to prevent the cable 132 from rotating relative to the wire pressing nail 131 to a certain extent.

[0109] In some embodiments, optionally, the wire pressing nail 131 is provided with a through hole, the cable 132 is passed through the through hole, and the cable 132 and the through hole are relatively fixed by means of compression and clamping by the sealing ring 163.

[0110] Optionally, the wire pressing nail 131 is further provided with a sealing groove, the sealing groove is in the shape of a truncated cone. The sealing ring 163 is arranged in the sealing groove, and the sealing ring 163 is sleeved on the cable 132. The sealing ring 163 is an annular structure.

[0111] The sealing ring 163 can be against the sealing groove of the wire pressing nail 131, the sealing ring 163 can be against the outer wall of the cable 132, and one end of the sealing ring 163 can be against the gasket 162. By providing the sealing ring 163, the sealing between the cable 132, the wire pressing nail 131 and the tail cover 120 can be achieved.

[0112] In some embodiments, optionally, Figure 3 As shown, the magnetostrictive displacement sensor 100 further includes a first shielding cover 171 . The first shielding cover 171 is disposed in the installation cavity 111 , and is disposed on a side of the signal board 141 away from the tail cover 120 . The sensitive component 143 is disposed in the first shielding cover 171 .

[0113] By providing the first shielding cover 171 , interference signals can be shielded, and the internal circuit of the magnetostrictive displacement sensor 100 can be protected from external interference.

[0114] In some embodiments, optionally, Figure 3 As shown, the magnetostrictive displacement sensor 100 further includes an insulating protective cover 172 . The insulating protective cover 172 is disposed in the installation cavity 111 , on a side of the signal board 141 away from the tail cover 120 , and between the first shielding cover 171 and the first cavity wall 1111 .

[0115] The insulating protective cover 172 is used to isolate the sensitive component 143 from the electronic compartment 110 to prevent contact and conduction between the two.

[0116] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the magnetostrictive displacement sensor 100 further includes a shielding tube 154. The shielding tube 154 is disposed between the measuring rod 151 and the position sensing assembly 144. One end of the shielding tube 154 extends into the installation cavity 111 through the second end surface 113 and abuts against the first shielding cover 171 and the insulating protective cover 172.

[0117] The shielding tube 154 can not only shield interference signals, but also protect the position sensing component 144 to a certain extent.

[0118] In some embodiments, optionally, Figure 3 As shown, the second end surface 113 is provided with a second mounting groove 1131 , at least a portion of the measuring rod 151 is disposed in the second mounting groove 1131 , and the measuring rod 151 is fixed to the second mounting groove 1131 by welding.

[0119] By placing at least a portion of the measuring rod 151 in the second mounting groove 1131, it is beneficial to increase the contact area between the measuring rod 151 and the electronic compartment 110, thereby improving the connection strength. The measuring rod 151 is welded and fixed to the second mounting groove 1131. This design method can ensure the installation accuracy between the measuring rod 151 and the electronic compartment 110, thereby improving the measurement accuracy of the magnetostrictive displacement sensor 100.

[0120] In some embodiments, optionally, Figure 2 As shown, the magnetostrictive displacement sensor 100 further includes a magnet gasket 153. The magnet gasket 153 is disposed between the measuring rod 151 and the annular magnet 152, and the magnet gasket 153 and the annular magnet 152 are relatively fixed.

[0121] The annular magnet 152 is used to generate a position signal for the position sensing component 144. The magnet gasket 153 is used to isolate the annular magnet 152 from its installation position to prevent magnetization at the installation position.

[0122] In some embodiments, optionally, Figure 2 As shown, the magnetostrictive displacement sensor 100 further includes a shielding cap 155 . The shielding cap 155 is disposed at one end of the shielding tube 154 away from the signal plate 141 , and is used to block the second opening 1541 of the shielding tube 154 .

[0123] The shielding tube cap 155 mainly serves to seal the second opening 1541 of the shielding tube 154 , thereby protecting the position sensing component 144 in the shielding tube 154 .

[0124] Optionally, the shielding tube cap 155 and the shielding tube 154 are relatively fixed by welding.

[0125] In some embodiments, optionally, Figure 1 and Figure 2 As shown, the magnetostrictive displacement sensor 100 further includes an end cap 156 . The end cap 156 is disposed at one end of the measuring rod 151 away from the signal plate 141 , and is used to block the third opening 1511 of the measuring rod 151 .

[0126] The end cap 156 mainly serves to seal the third opening 1511 of the measuring rod 151 , thereby protecting the internal components of the measuring rod 151 .

[0127] Optionally, the end cap 156 and the measuring rod 151 are relatively fixed by welding.

[0128] It should be noted that the measuring rod 151 is used to protect the shielding tube 154 and the position sensing component 144 , and is used to limit the movement direction of the annular magnet 152 .

[0129] In some embodiments, optionally, a potting glue is provided between the measuring rod 151 and the shielding tube 154 to limit the relative position between the measuring rod 151 and the shielding tube 154 to ensure the measurement accuracy of the magnetostrictive displacement sensor 100 .

[0130] In one embodiment of the utility model, an intrinsically safe explosion-proof displacement sensor (magnetostrictive displacement sensor 100) based on the magnetostrictive principle includes an electronic compartment 110, a tail cover 120, a wire pressing nail 131, a sensitive component 143, a signal board 141, a measuring rod 151 and a ring magnet 152 (the connection relationship is not repeated here). The magnetostrictive displacement sensor 100 provided by the utility model has the advantages of compact structure, fully enclosed design, protection level of IP68 (a protection level), high-precision measurement, high stability and high reliability data output, non-contact measurement, long life and maintenance-free. The magnetostrictive displacement sensor 100 complies with the relevant provisions of GB / T3836.1-2021 "Electrical Equipment for Explosive Gas Environments, Part 1, General Requirements for Equipment" and GB / T3836.4-2021 "Electrical Equipment for Explosive Gas Environments, Part 4: Equipment Protected by Intrinsically Safe "i"", and is suitable for coal mine gas explosive environments with a high explosion-proof level.

[0131] It should be emphasized that the advantages of the magnetostrictive displacement sensor 100 of the utility model are: 1. Compact structure, small installation space requirement; 2. Non-contact measurement, long life, maintenance-free; 3. Fully enclosed design, protection level up to IP68; 4. Double seal structure, strong pressure bearing capacity; 5. Suitable for a variety of installation sites to meet different needs; 6. Multi-layer shielding protection, strong anti-interference ability, and more stable output signal; 7. Adopting intrinsically safe structure design, suitable for specific explosion-proof occasions.

[0132] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0133] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0134] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0135] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetostrictive displacement sensor, characterized in that: include: An electronic compartment, wherein a mounting cavity is provided inside the electronic compartment, the electronic compartment has a first end surface and a second end surface arranged opposite to each other in a first direction, the first end surface is provided with a first opening, and the first opening is communicated with the mounting cavity; A tail cover, at least a portion of which is disposed at the first opening, the tail cover is used to block the first opening, and the tail cover is relatively fixed to the electronic compartment by welding; A wire pressing nail, threadedly connected to the tail cover; The cable is passed through the pressing nail, and the cable is relatively fixed to the pressing nail; A signal board is arranged in the installation cavity, and the signal board is connected to the cable; A sensitive component is arranged in the installation cavity, and the sensitive component is arranged on a side of the signal board away from the tail cover; A position sensing component is disposed on a side of the signal plate away from the tail cover, the position sensing component penetrates the installation cavity and extends out from the second end surface; A measuring rod, disposed on the second end surface, the measuring rod is relatively fixed to the electronic compartment, and the measuring rod sleeve is disposed on the portion of the position sensing component extending out of the second end surface; An annular magnet is movably mounted on the measuring rod; Wherein, the first end surface is further provided with a card slot, the card slot is communicated with the first opening, and the card slot is communicated with the installation cavity, the first slot wall of the card slot is connected with the first cavity wall of the installation cavity through a first connecting wall surface, and the first slot wall, the first connecting wall surface and the first cavity wall form a first step structure; The tail cover comprises: A first portion is disposed in the card slot, the first portion having a third end face and a fourth end face that are disposed opposite to each other in the first direction, the fourth end face abuts against the first connecting wall face, the first side wall face of the first portion abuts against the first slot wall, and the third end face is flush with the first end face; A second portion, disposed on the third end surface, wherein the second portion and the first portion form a second step structure; The third part is arranged at one end of the second part away from the first part, and the third part and the second part form a third step structure; the third part is provided with a first installation groove, at least a part of the wire pressing nail is arranged in the first installation groove, the outer wall of the wire pressing nail is threadedly connected with the second groove wall of the first installation groove, and the first installation groove is used to communicate with the installation cavity so that the cable can be connected to the signal board; The first part, the second part and the third part are an integrated structure; The first end surface is connected to the second side wall surface of the electronic compartment through a first chamfered surface; The third portion has a fifth end surface at one end facing away from the second portion, and the fifth end surface is connected to the third side wall surface of the third portion via a third chamfered surface; The second side wall surface is provided with at least two first limiting grooves, at least one of the first limiting grooves is provided with a sealing assembly, and the sealing assembly includes a retaining ring and an O-ring.

2. The magnetostrictive displacement sensor according to claim 1, characterized in that: Also includes: A gasket is arranged in the first installation groove, one end of the wire pressing nail extending into the first installation groove is used to abut against the gasket, and one end of the cable can be passed through the gasket and connected to the signal board.

3. The magnetostrictive displacement sensor according to claim 2, characterized in that: Also includes: A sealing ring, at least a portion of which is disposed between the wire pressing nail and the cable, and the sealing ring is used to abut against the gasket and the wire pressing nail.

4. The magnetostrictive displacement sensor according to any one of claims 1 to 3, characterized in that: Also includes: The first shielding cover is arranged in the installation cavity, the first shielding cover is arranged on a side of the signal board away from the tail cover, and the sensitive component is arranged in the first shielding cover.

5. The magnetostrictive displacement sensor according to claim 4, characterized in that: Also includes: An insulating protective cover is arranged in the installation cavity, the insulating protective cover is arranged on a side of the signal board away from the tail cover, and the insulating protective cover is arranged between the first shielding cover and the first cavity wall.

6. The magnetostrictive displacement sensor according to claim 5, characterized in that: Also includes: A shielding tube is arranged between the measuring rod and the position sensing component. One end of the shielding tube extends into the installation cavity through the second end surface and abuts against the first shielding cover and the insulating protection cover.

7. The magnetostrictive displacement sensor according to any one of claims 1 to 3, characterized in that: The second end surface is provided with a second mounting groove, at least a portion of the measuring rod is arranged in the second mounting groove, and the measuring rod is fixed to the second mounting groove by welding.

8. The magnetostrictive displacement sensor according to any one of claims 1 to 3, characterized in that: Also includes: The magnet gasket is arranged between the measuring rod and the annular magnet, and the magnet gasket and the annular magnet are relatively fixed.

9. The magnetostrictive displacement sensor according to claim 6, characterized in that: Also includes: The shielding tube cap is arranged at one end of the shielding tube away from the signal plate, and the shielding tube cap is used to block the second opening of the shielding tube.

10. The magnetostrictive displacement sensor according to any one of claims 1 to 3, characterized in that: Also includes: An end cap is arranged at an end of the measuring rod away from the signal plate, and the end cap is used to block the third opening of the measuring rod.

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