CN205785051U

CN205785051U - A kind of LVDT formula displacement transducer

Info

Publication number: CN205785051U
Application number: CN201620621125.0U
Authority: CN
Inventors: 鲍亚子; 鲍文博
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-22
Filing date: 2016-06-22
Publication date: 2016-12-07
Anticipated expiration: 2026-06-22

Abstract

The utility model discloses a kind of LVDT formula displacement transducer, including: outer tube, inner tube, coil groups, measurement bar, cable, coil groups and circuit board, to measure bar and be made up of end to end iron core and measuring staff, outer tube is stretched out in one end of measuring staff.Coil groups includes: the primary coil being enclosed within outer wall of inner tube, the first secondary coil being axially enclosed within side by side on primary coil outer wall and second subprime coil, and the first secondary coil is the 1/2 of primary coil with the length of second subprime coil.The two ends of inner tube extend respectively on the outer face of drive end bearing bracket and rear end cap, and inner tube two ends are through hole, circuit board position between outer tube and inner tube.This utility model detection performance is good and easy to use.

Description

A kind of LVDT formula displacement transducer

Technical field

This utility model relates to displacement transducer technology field, particularly relates to a kind of LVDT formula displacement transducer.

Background technology

Auto parts and components such as automobile brake disc, brake block etc., will carry out thickness, aperture, the measurement beated before dispatching from the factory, Generally being carried out composite measurement by many LVDT formula displacement transducers, corresponding measurement result inputs to host computer, and host computer is the most right Measurement data is analyzed statistics, thus reaches the purpose producing the comprehensive management and control of product quality.

The structure of LVDT formula displacement transducer of the prior art is typically by outer tube, inner tube, coil, front and rear cover, circuit Plate, screen layer, iron core, measuring staff, outlet etc. is partly constituted, and cell winding is by a primary coil and two groups of secondary coil groups Become.Such as, notification number is the utility model patent of CN202814325U, which discloses a kind of displacement transducer, by difference Dynamic transformer principle, circuit pcb board provides an excitation AC signal in primary winding, when measuring staff interlocks iron core in inner tube Time mobile, produce subtractive signals at two groups of secondary coils, pcb board carry out signal processing, make outputting standard signal of telecommunication 0-5V or 4-20mA。

Existing LVDT formula displacement transducer has the disadvantage that: 1, when displacement measurement stroke 10-100mm scope, sensing Device design is usually and frame design becomes multistage grid (or imaginary grid), then winding turns data is pressed in different grid Carry out coiling according to increasing or decreasing mode, owing to grid is many, coiling difficulty is big, coiling time length and cost high, two groups of secondary wire Circle is difficult to be designed to electric symmetry, owing to two groups of secondary of sensor are asymmetric so that the detection performance of sensor is bad；2, pass Sensor is internally integrated the structure of pcb board and typically uses leading-out terminal blind hole, when reality is measured in, cross range time measure bar can clash into Rear end cap, causes the damage measuring bar.

Utility model content

For solving above-mentioned technical problem, the utility model proposes a kind of LVDT formula displacement transducer, this sensor detection property Energy is good and easy to use.

The technical solution adopted in the utility model is, a kind of LVDT formula displacement transducer of design, including: outer tube, coaxially pacifies Dress inner tube within the outer tube, set coil groups on inner pipe, be movably arranged in inner tube measure bar, be located at the cable of outer tube one end Line, be located at outer tube in the circuit board that is connected with coil groups and cable respectively, measure bar by end to end iron core and measuring staff structure Becoming, outer tube is stretched out in one end of measuring staff.Coil groups includes: the primary coil that is enclosed within outer wall of inner tube, be axially enclosed within primary line side by side End face patch adjacent on the first secondary coil on ring outer wall and second subprime coil, the first secondary coil and second subprime coil Merging the centre position being positioned at primary coil, the first secondary coil is the 1/2 of primary coil with the length of second subprime coil.

Preferably, outer tube is respectively arranged at two ends with drive end bearing bracket and rear end cap, the two ends of inner tube extend respectively to drive end bearing bracket and after On the outer face of end cap, and inner tube two ends are through hole.

Preferably, circuit board position between outer tube and inner tube.

Preferably, a circle primary insulation layer, the first secondary coil and second subprime line it are provided with between inner tube and primary coil The outer wall of circle is provided with a circle time class B insulation layer.

Preferably, the outer wall of secondary insulating barrier is additionally provided with a circle screen layer.

Preferably, cable stretches out outer tube through rear end cap, and the inner face of rear end cap is welded with sheet metal, the shielding of cable Layer is soldered on sheet metal.

Preferably, inner tube is also cased with on front apron and backboard, front apron and backboard relative to end face be equipped with poly- Ester film pad, primary coil, the first secondary coil, second subprime coil, primary insulation layer, secondary insulating barrier and screen layer are equal It is arranged between described mylar pad.

Two secondary coils of the present utility model are distributed in the outer layer of primary coil, and the length of two secondary coils is The half of primary coil, structurally and electrically the most symmetrical, the linearity is good, and temperature stability is high.Preferably, in this utility model The extended length of pipe, extends to rear end cap from the drive end bearing bracket of outer tube, owing to inner tube two ends are through hole, follows when measuring bar When the displacement that testee moves exceedes range, measuring bar will not be knocked, and extends the service life of sensor, measures bar and also may be used Using unrestricted choice either end as direction of insertion, use easily.Optimizing further, pcb board circuit prevents in inner tube And between outer tube, there is preferable anti-electromagnetic interference performance.

Accompanying drawing explanation

Below in conjunction with embodiment and accompanying drawing, this utility model is described in detail, wherein:

Fig. 1 is schematic perspective view of the present utility model；

Fig. 2 is front schematic view of the present utility model；

Fig. 3 is the A-A generalized section of Fig. 2；

Fig. 4 is fractionation schematic diagram of the present utility model；

Fig. 5 is the structural representation of this utility model drive end bearing bracket.

Detailed description of the invention

As shown in Figures 1 to 3, the LVDT formula displacement transducer that the utility model proposes, including: outer tube 1, inner tube 2, coil Group, measurement bar, cable 3 and circuit board 4.Wherein, outer tube 1 and inner tube 2 are the body of inner hollow, and inner tube 2 is co-axially mounted In outer tube 1, coil groups is enclosed within the outer ring of inner tube 2, measures bar and is movably arranged in inner tube 2, and circuit board 4 is located in outer tube 1 also Being connected with coil groups, one end that cable 3 passes outer tube 1 is connected with circuit board 4 in extending into outer tube 1.

As shown in Figure 3,4, measure bar be made up of end to end iron core 5 and measuring staff 6, iron core 5 be positioned at inner tube 2 is overlapped wired The position of circle group, one end of measuring staff 6 is connected with the end of iron core 5, the other end stretches out outer tube 1.Coil groups includes: be enclosed within inner tube 2 Primary coil 7 on outer wall, axial the most side by side the first secondary coil 8 that laminating is enclosed within primary coil 7 outer wall and second subprime line Circle 9, primary coil 7 coiling is uniform, and the induced field of generation also ratio is more uniform.On first secondary coil 8 and second subprime coil 9 Adjacent end face is fitted and is positioned at the centre position of primary coil 7, and the length of the first secondary coil 8 and second subprime coil 9 Degree is the 1/2 of primary coil 7.First secondary coil 8 and second subprime coil 9 are divided equally and are enclosed within primary coil 7, add man-hour around Line is simple, symmetrical configuration, electrically symmetry, and the linearity of sensor is good, and temperature stability is high, and in actual measurement, detection is more Accurately.

Preferably, as shown in Figure 3,4, outer tube 1 be respectively arranged at two ends with drive end bearing bracket 10 and rear end cap 11, drive end bearing bracket 10 and after Being equipped with the installing hole matched with inner tube 2 diameter on end cap 11, the two ends of inner tube 2 extend respectively to drive end bearing bracket 10 and rear end cap In the installing hole of 11, drive end bearing bracket 10 and rear end cap 11 are stainless steel material, and inner tube 2 is fixed on drive end bearing bracket 10 by laser welding With on rear end cap 11.Rear end cap 11 is provided with wire hole, is cased with outlet protection pipe 12 in wire hole, and cable 3 is protected through outlet Pillar 12 enters in outer tube 1, and band 13 earned by the nylon being additionally provided with latent electricity cable 3 in outer tube 1.Preferably, circuit board 4 is positioned at outer tube Position between 1 and inner tube 2, has preferable anti-electromagnetic interference performance, and meanwhile, the two ends of inner tube 2 are through hole, measures during use Bar can insert inner tube 2 from the either end of sensor, and when measure bar follow the displacement that testee moves exceed range time, Do not have the stop of the objects such as end cap due to end, measuring bar will not collide, and the service life of sensor is longer.

More excellent, as it is shown on figure 3, be provided with a circle primary insulation layer 14, primary insulation layer between inner tube 2 and primary coil 7 14 use 3M insulating tape, and the outer wall of the first secondary coil 8 and second subprime coil 9 is provided with a circle time class B insulation layer 15, anti- Only there is the situations such as electric leakage in sensor in use, it is ensured that safety and stability when sensor uses.Further, secondary insulating barrier 15 Outer wall on be additionally provided with a circle screen layer 16, by electromagnetic interference when preventing coil groups from using.It is fixed with front apron in inner tube 2 17 and backboard 18, front apron 17 and backboard 18 on relative to end face be equipped with mylar pad 19, primary coil 7, One secondary coil 8, second subprime coil 9, primary insulation layer 14, secondary insulating barrier 15 and screen layer 16 are installed in two polyester Between thin film pad 19, mylar pad 19 has the multifrequency natures such as high temperature resistant, rub resistance.

Further, as shown in Figure 4,5, cable 3 stretches out outer tube through rear end cap 11, the inner face weldering of rear end cap 11 Having sheet metal 20, the screen layer of cable 3 to be soldered on sheet metal 20, on the one hand the effect of sheet metal 20 makes outer tube 1 by gold Belong to sheet 20 and directly receive the screen layer of cable 3 mutually, add the electromagnetism interference performance of sensor, on the other hand by welding Connected mode add the tensile strength of cable 3.

The operation principle of above-mentioned LVDT formula displacement transducer approximately as, as shown in Figure 2,3, measuring staff 6 is at external component band Dynamic lower mobile, iron core 5 moves under the drive of measuring staff 6 in coil groups, changes between primary coil 7 and two secondary coils Mutual induction amount, the induction electromotive force change that two secondary coils produce, so, due to two secondary coil voltage opposite polarity, ferrum The displacement of core 5 has reformed into the real-time difference voltage signal of two secondary coils and has exported from cable.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model Protection domain within.

Claims

1. a LVDT formula displacement transducer, including: outer tube (1), the inner tube (2) being coaxially mounted in described outer tube (1), it is enclosed within Coil groups in said inner tube (2), the measurement bar being movably arranged in said inner tube (2), it is located at the cable of described outer tube (1) one end Line (3), be located at described outer tube (1) in the circuit board (4) that is connected with described coil groups and cable (3) respectively, described measurement bar Being made up of end to end iron core (5) and measuring staff (6), described outer tube (1) is stretched out in one end of described measuring staff (6)；

It is characterized in that, described coil groups includes: the primary coil (7) that is enclosed within said inner tube (2) outer wall, be axially enclosed within side by side The first secondary coil (8) on described primary coil (7) outer wall and second subprime coil (9), described first secondary coil (8) and The upper adjacent end face of second subprime coil (9) is fitted and is positioned at the centre position of primary coil (7), and described first secondary coil (8) length with second subprime coil (9) is the 1/2 of primary coil (7).

2. LVDT formula displacement transducer as claimed in claim 1, it is characterised in that before described outer tube (1) is respectively arranged at two ends with End cap (10) and rear end cap (11), the two ends of said inner tube (2) extend respectively to drive end bearing bracket (10) and the outer end of rear end cap (11) On face, and said inner tube (2) two ends are through hole.

3. LVDT formula displacement transducer as claimed in claim 2, it is characterised in that described circuit board (4) is positioned at described outer tube (1) position and between said inner tube (2).

4. the LVDT formula displacement transducer as described in any one of claims 1 to 3, it is characterised in that said inner tube (2) and described A circle primary insulation layer (14), described first secondary coil (8) and second subprime coil (9) it is provided with between primary coil (7) Outer wall is provided with circle time class B insulation layer (15).

5. LVDT formula displacement transducer as claimed in claim 4, it is characterised in that on the outer wall of described secondary insulating barrier (15) It is additionally provided with a circle screen layer (16).

6. LVDT formula displacement transducer as claimed in claim 5, it is characterised in that described cable (3) passes rear end cap (11) stretching out described outer tube (1), the inner face of described rear end cap (11) is welded with sheet metal (20), the shielding of described cable (3) Layer is soldered on described sheet metal (20).

7. LVDT formula displacement transducer as claimed in claim 5, it is characterised in that said inner tube is also cased with front apron on (2) (17) go up the most relative end face be equipped with mylar pad with backboard (18), described front apron (17) and backboard (18) (19), described primary coil (7), the first secondary coil (8), second subprime coil (9), primary insulation layer (14), secondary class B insulation Layer (15) and screen layer (16) are installed between described mylar pad (19).