Modularized LVDT sensor

Abstract

The utility model discloses a modularized LVDT sensor comprising a through pipe and a plurality of analog-to-digital units, the plurality of analog-to-digital units sleeve the outer side of the through pipe in parallel to form a stator winding, and a rotor iron core is arranged in the through pipe in a penetrating manner; the rotor iron core comprises a core rod coaxially extending into the through pipe, a plurality of core sleeves are coaxially arranged at the end of the core rod, a screw penetrating through the core sleeves is fixed to the end of the core rod, and the outer end of the screw is detachably connected with a guide head supporting the core sleeves. The beneficial effects of the utility model are that the LVDT assembly reduces the types of LVDT assemblies through the combination of the analog-to-digital units, improves the consistency of product performance through batch manufacturing of standard units, further improves the design and production efficiency of LVDT sensor products, reduces the production cost, shortens the production cycle of sensors, reduces the manpower consumption, does not need to customize a winding structure according to the products, and reduces the production cost. Consistency of LVDT sensors of the same model is improved, and replaceability can be achieved conveniently when the LVDT sensors are matched with transmitters for use.

Description

Technical Field

[0001] The utility model relates to the field of sensor research and development, and in particular to a modular LVDT sensor. Background Art

[0002] LVDT (Linear Variable Displacement Transducer) is the abbreviation of linear variable differential transformer. It is a widely used absolute linear displacement sensor with the advantages of long life, high reliability, and high precision. LVDT sensor products have a variety of appearance forms (such as hinged, rebound, etc.). Regardless of the form, its core components are the stator winding and the mover core. The typical structure is a cylinder with a through hole in the center. The winding is encapsulated in it, and the mover core is placed in the center through hole for linear motion. The winding part usually consists of a primary winding and two symmetrical secondary windings. The three windings are wound on the same winding frame. The coil distribution form is generally three-segment and spindle. As shown in the attached figure Figure 1 , 2 When the primary winding is excited by voltage, the mover core made of soft magnetic material moves in the through hole, causing the induced magnetic field to change, forming a voltage difference between the two secondary windings, thereby feeding back the core position.

[0003] Since LVDT sensors of different ranges have different mechanical dimensions, the components of LVDT sensors of different ranges are not universal. Each product requires separately designed structural components and winding solutions. In addition, since automatic winding equipment is still difficult to wind coils with complex gradient requirements (refer to the spindle distribution in the previous article), the degree of automation in the production process of LVDT sensors is still at a low level. In particular, high-performance LVDTs (such as military and aerospace applications) are still mainly produced manually. The same type of LVDT sensors manually wound by different winders have poor consistency and need to be compensated for consistency turns one by one, resulting in poor consistency of the same type of LVDT sensors. It is difficult to achieve interchangeability when matching transmitters, with a long production cycle, high labor consumption, and high sporadic processing costs. In addition, there are losses such as rework due to product design errors and redundant production to ensure full product delivery. Utility Model Content

[0004] The purpose of the present utility model is to provide a modular LVDT sensor in order to solve the above-mentioned problems. By combining analog and digital units, the types of LVDT components are reduced, and the consistency of product performance is improved by batch manufacturing of standard units, thereby improving the design and production efficiency of LVDT sensor products and reducing production costs. Details are explained below.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a modular LVDT sensor, comprising a through tube and a plurality of groups of modulus units, wherein the plurality of groups of modulus units are arranged in parallel on the outside of the through tube to form a stator winding, and a mover core is inserted into the through tube;

[0007] The movable core comprises a core rod coaxially extending into the through tube, a plurality of core sleeves are coaxially arranged at the end of the core rod, and a screw rod penetrating the core sleeve is fixed at the end of the core rod, and a guide head supporting the core sleeve is detachably connected to the outer end of the screw rod.

[0008] The above modular LVDT sensor is adopted, and the core component winding (composed of multiple groups of modular units) and the mover core of the traditional LVDT product are obtained by combining standard modular units. The electrical stroke and performance parameters of the product can be adjusted according to the increase, decrease and arrangement and combination of modular units. The winding skeleton of the modular LVDT sensor is processed into several groups of separable modular units, and each modular unit is connected in a pin-type or contact-type manner. The mover core is also processed in this way, and the units are flexibly combined to meet various customized requirements. The unit section end plate is processed by printed circuit technology, and each end plate is arranged with several connection points on the outside. The start and end ends of each winding are connected to the connection points. The connection points between the units can be connected by welding, contact or pin. Taking 4 connection points as an example, each unit can accommodate less than 4 groups of windings to meet the design requirements of complex winding arrangement schemes. Correspondingly, the mover core is produced as several types of units with a fixed modular length, and the core sleeve is connected and expanded through a through hole or a threaded hole to obtain a mover core combination of different lengths.

[0009] In the actual production process, a variety of different specifications of modular units and core sleeves can be preset to meet more complex solution designs and wider range coverage, strike a balance between modular unit types and production efficiency, and pre-produce standard modular units in batches, and then combine and assemble them into final products according to actual needs.

[0010] Preferably, an internal thread is provided inside the guide head, the guide head and the screw rod are detachably connected via the thread, and the end of the guide head is tightly pressed against the end face of the core sleeve.

[0011] Preferably, the screw is provided with a tapered end near one end of the guide head, and a tapered hole for accommodating the screw is transversely penetrated through the middle of the core sleeve, and openings at both ends of the tapered hole are chamfered structures.

[0012] Preferably, the modular unit comprises a winding skeleton transversely sleeved on the outside of the through pipe, annular unit section end plates are fixed to the outer sides of both ends of the winding skeleton, and adjacent unit section end plates of multiple groups of the winding skeletons are tightly abutted against each other.

[0013] Preferably, a coil is wound around the outside of the winding skeleton, and the winding skeleton and the unit segment end plate are both made of non-metallic material.

[0014] Preferably, a plurality of groups of transversely penetrating sockets are arranged around the outer side of the end surface of the unit segment end plate, and pins for connecting two adjacent groups of unit segment end plates are transversely penetrated inside the plurality of groups of sockets.

[0015] Preferably, the pin includes a fixing rod extending into one end of the socket, the fixing rod is threadedly engaged with the socket, and the end of the pin extending out of the socket is a movable rod capable of plugging and engaging with the socket on the adjacent unit section end plate.

[0016] Preferably, the outer end surface of the unit segment end plate is provided with protrusions and grooves symmetrically arranged front and back along the axis of the winding skeleton, and the protrusions can be snap-fitted with the grooves of the adjacent unit segment end plates.

[0017] Preferably, a convex ball and a concave pit are symmetrically arranged on the outer end surface of the unit section end plate between the protrusion and the groove, and the convex ball can be adapted and snap-fitted with the corresponding concave pit on the adjacent unit section end plate.

[0018] The beneficial effects are as follows: the utility model reduces the types of LVDT components through the combination of modular units, improves the consistency of product performance through batch manufacturing of standard units, thereby improving the design and production efficiency of LVDT sensor products and reducing production costs. Specifically, by decomposing a coil with a complex gradient into a number of simple units, the electrical stroke and performance parameters of the product can be adjusted according to the increase or decrease and arrangement and combination of the modular units, and then automatically produced and assembled one by one. The units are flexibly combined to meet various customized needs, so that the production of high-performance LVDT displacement sensors is freed from the traditional limitation of manual participation, and is convenient for subsequent full-automatic production.

[0019] It is also possible to preset modules of various specifications to meet more complex scheme designs and wider range coverage, and strike a balance between the types of module units and production efficiency, so that standard module units can be pre-produced in batches and then assembled into final products according to actual needs;

[0020] Shorten the sensor production cycle, reduce manpower consumption, and do not need to customize the winding structure according to the product, reduce processing costs, solve the current product customization caused by design errors and rework problems, and avoid redundant production to ensure full product delivery and other losses, improve the consistency of the same model LVDT sensor, and facilitate interchangeability when matching the transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a main view structure diagram of the three-segment coil distribution form in the prior art;

[0023] Figure 2 It is a main view structural diagram of the spindle coil distribution form in the prior art;

[0024] Figure 3 It is the main structural diagram of the utility model;

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the utility model;

[0026] Figure 5 It is a schematic diagram of the structural disassembly of the utility model;

[0027] Figure 6 This is a schematic diagram of the structural disassembly of the mover core of the utility model;

[0028] Figure 7 This is a schematic diagram of the structural disassembly of the mover core of the utility model in another direction;

[0029] Figure 8 This is a schematic diagram of the structural decomposition of the modular unit in the first embodiment of the utility model;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the modular unit in the second embodiment of the present utility model.

[0031] The following are the descriptions of the reference numerals:

[0032] 1. Through pipe; 2. Modular unit; 201. Winding frame; 202. Unit section end plate; 203. Coil; 204. Jack; 205. Pin; 206. Bump; 207. Groove; 208. Protruding ball; 209. Pit; 3. Mover core; 301. Core rod; 302. Screw; 302a. Conical end; 303. Core sleeve; 303a. Conical hole; 304. Guide head; 304a. Conical mouth. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] See also Figure 3-Figure 8 As shown, the utility model provides a modular LVDT sensor, including a through tube and several groups of analog-to-digital units, wherein the several groups of the analog-to-digital units are arranged in parallel on the outside of the through tube to form a stator winding whose length can be adjusted as needed, so as to be able to adapt to LVDT sensors with different electrical stroke requirements, and a mover core is inserted into the through tube, and the mover core can also be combined as needed to form products of different lengths. Specifically, the mover core includes a core rod coaxially extending into the through tube, and the core rod is gap-matched with the through tube. Several groups of core sleeves are coaxially arranged at the end of the core rod, and the several groups of core sleeves are connected end to end in sequence to form a mover structure, and a screw rod passing through the core sleeve is fixed at the end of the core rod, and a guide head supporting the core sleeve is detachably connected to the outer end of the screw rod, and the diameter of the core rod is larger than the diameter of the screw rod, and the guide head is used to press the multiple groups of core sleeves against the end of the core rod to fix the core rod, so that the core sleeve and the screw rod are fixedly connected, and the core sleeve, the screw rod and the core rod are kept as an integrated structure.

[0036] As an optional embodiment, an internal thread is provided inside the guide head, and the guide head and the screw rod are detachably connected through the thread, ensuring that the guide head can be disassembled and connected from the screw rod, the end of the guide head is tightly abutted against the end face of the core sleeve, and the screw rod is provided with a tapered end near one end of the guide head, and a tapered hole for accommodating the screw rod to pass through is horizontally penetrated in the middle of the core sleeve, and the openings at both ends of the tapered hole are chamfered structures, and the opening at the end of the guide head is a tapered mouth of the chamfered structure, so that the screw rod can pass through the core sleeve and extend into the guide head to perform combined fixation of the mover core;

[0037] The modular unit comprises a winding skeleton which is transversely sleeved on the outside of the through pipe, and an annular unit section end plate is fixed on the outside of both ends of the winding skeleton, and the unit section end plate is a printed circuit board. The adjacent unit section end plates of multiple groups of the winding skeletons are tightly pressed against each other, and a coil is wound on the outside of the winding skeleton, and the winding skeleton and the unit section end plate are both made of non-metallic materials;

[0038] In addition, multiple groups of transversely penetrating jacks are arranged around the outer side of the end surface of the unit section end plate, and pins for connecting two adjacent groups of unit section end plates are transversely penetrated inside the multiple groups of jacks, and the unit section end plates of adjacent modular units are electrically connected through the pins;

[0039] The pin includes a fixing rod extending into one end of the socket, the fixing rod is threadedly matched with the socket, and the end of the pin extending out of the socket is a movable rod that can be plugged into and matched with the socket on the adjacent unit section end plate. A pin is fixed to the outer side of the unit section end plate on one side of the winding skeleton, and the socket on the unit section end plate on the other side is in an exposed state, thereby facilitating the connection of the unit section end plates of adjacent modular units through the pin.

[0040] With the above structure, the core component winding (composed of multiple groups of modular units) and the mover core of the traditional LVDT product are obtained by combining standard modular units. The electrical stroke and performance parameters of the product can be adjusted according to the increase, decrease and arrangement of the modular units. The winding skeleton of the modular LVDT sensor is processed into several groups of separable modular units, and each modular unit is connected in a pin-type or contact-type manner. The mover core is also processed in this way. The units are flexibly combined to meet various customized needs. The unit section end plate is processed by printed circuit technology. Several connection points are arranged on the outside of each end plate. The starting and ending ends of each winding are connected to the connection points. The connection points between the units can be connected by welding, contacts or pins. Taking 4 connection points as an example, each unit can accommodate less than 4 groups of windings to meet the design requirements of complex winding arrangement schemes. Correspondingly, the mover core is produced as several types of units with a fixed modular length, and the core sleeve is connected and expanded through a through hole or a threaded hole to obtain a mover core combination of different lengths.

[0041] In the actual production process, you can also preset a variety of different specifications of modular units and core sleeves to meet more complex scheme designs and wider range coverage, strike a balance between the types of modular units and production efficiency, and pre-produce standard modular units in batches, and then assemble them into final products according to actual needs;

[0042] By combining modular units, the types of LVDT components are reduced, and the consistency of product performance is improved by mass manufacturing standard units, thereby improving the design and production efficiency of LVDT sensor products and reducing production costs. Specifically, by decomposing coils with complex gradients into several simple units, the electrical stroke and performance parameters of the product can be adjusted according to the increase or decrease and arrangement and combination of modular units, and then automatically produced and assembled one by one. The units can be flexibly combined to meet various customized needs, so that the production of high-performance LVDT displacement sensors is freed from the traditional limitation of manual participation, which is convenient for subsequent fully automated production.

[0043] It is also possible to preset modules of various specifications to meet more complex scheme designs and wider range coverage, and strike a balance between the types of module units and production efficiency, so that standard module units can be pre-produced in batches and then assembled into final products according to actual needs;

[0044] Shorten the sensor production cycle, reduce manpower consumption, and do not need to customize the winding structure according to the product, reduce processing costs, solve the current product customization caused by design errors and rework problems, and avoid redundant production to ensure full product delivery and other losses, improve the consistency of the same model LVDT sensor, and facilitate interchangeability when matching the transmitter.

[0045] Embodiment 2:

[0046] Reference Fig. 9 , the difference between the second embodiment and the first embodiment is that: the outer end surface of the unit section end plate is symmetrically provided with a protrusion and a groove along the axis of the winding skeleton, the protrusion can be snap-fitted with the groove of the adjacent unit section end plate, and the outer end surface of the unit section end plate between the protrusion and the groove is symmetrically provided with a convex ball and a concave pit, and the convex ball can be snap-fitted with the corresponding concave pit on the adjacent unit section end plate. The contact connection is made by the protrusion matching the groove and the protrusion matching the concave pit, and then the pin connection is replaced by the contact connection, so as to improve the connection stability of the adjacent modular units. This embodiment is suitable for application scenarios where the LVDT displacement sensor is vibrating or moving.

[0047] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A modular LVDT sensor, characterized in that: It comprises a through pipe and a plurality of groups of modulus units, wherein the plurality of groups of modulus units are arranged in parallel on the outside of the through pipe to form a stator winding, and a mover core is inserted into the through pipe; The movable core comprises a core rod coaxially extending into the through tube, a plurality of core sleeves are coaxially arranged at the end of the core rod, and a screw rod penetrating the core sleeve is fixed at the end of the core rod, and a guide head supporting the core sleeve is detachably connected to the outer end of the screw rod.

2. A modular LVDT sensor according to claim 1, characterized in that: An internal thread is arranged inside the guide head, and the guide head is detachably connected to the screw rod through the thread, and the end of the guide head is tightly pressed against the end surface of the core sleeve.

3. A modular LVDT sensor according to claim 2, characterized in that: The screw rod is provided with a tapered end near one end of the guide head, and a tapered hole for accommodating the screw rod to pass through is horizontally penetrated through the middle of the core sleeve, and both ends of the tapered hole have chamfered openings.

4. A modular LVDT sensor according to claim 1, characterized in that: The modular unit comprises a winding skeleton which is transversely sleeved on the outside of the through pipe, and annular unit section end plates are fixed on the outer sides of both ends of the winding skeleton, and adjacent unit section end plates of multiple groups of the winding skeletons are tightly pressed against each other.

5. A modular LVDT sensor according to claim 4, characterized in that: A coil is wound around the outside of the winding frame, and both the winding frame and the unit segment end plate are made of non-metallic materials.

6. A modular LVDT sensor according to claim 5, characterized in that: A plurality of groups of transversely penetrating plug holes are arranged around the outer side of the end surface of the unit segment end plate, and pins for connecting two adjacent groups of unit segment end plates are transversely penetrated inside the plurality of groups of plug holes.

7. A modular LVDT sensor according to claim 6, characterized in that: The insertion pin includes a fixing rod extending into one end of the insertion hole, the fixing rod is threadedly matched with the insertion hole, and the end of the insertion pin extending out of the insertion hole is a movable rod capable of plugging and matching with the insertion hole on the adjacent unit section end plate.

8. A modular LVDT sensor according to claim 5, characterized in that: The outer end surface of the unit segment end plate is symmetrically provided with a protrusion and a groove along the axis of the winding skeleton, and the protrusion can be snap-fitted with the groove of the adjacent unit segment end plate.

9. A modular LVDT sensor according to claim 8, characterized in that: The outer end surface of the unit segment end plate between the protrusion and the groove is symmetrically provided with convex balls and concave pits, and the convex balls can be adapted and engaged with the corresponding concave pits on the adjacent unit segment end plate.

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