Elastic resistance strain sensor

Abstract

The utility model discloses an elastic resistance strain type sensor, and particularly relates to the technical field of sensors, the elastic resistance strain type sensor comprises a sensor body, the sensor body is composed of a position retaining beam, a right base block, a left base block, an elastic sleeve, a wire protecting sleeve, a signal cable, a fixed magnetic steel, an elastic sensitive curved sheet and a resistance type strain sheet; the position retaining beam is arranged at the bottommost part, a right foundation block and a left foundation block are arranged at the tops of the two ends of the position retaining beam respectively, an elastic sleeve is connected between the right foundation block and the left foundation block, and fixed magnetic steel is fixedly mounted on the outer walls of the same sides of the right foundation block and the left foundation block; and one end part of the left foundation block is connected with a wire protecting sleeve along the direction of the elastic sleeve. The elastic resistance strain type sensor designed by the utility model can adapt to the influence of various vibrations of railway open-air environments and train operation, can monitor all strain areas, is not easy to fall off, is firmly fixed, is suitable for actual railway application, and is simple in structural design and easy to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, and more specifically, to an elastic resistance strain sensor. Background Art

[0002] On railways, parts such as splints that are prone to stress concentration are likely to break, causing serious safety problems to railway transportation. Therefore, it is very necessary to monitor these parts with stress concentration in real time.

[0003] Currently, some research institutions directly attach strain gauges to stress concentration areas to monitor the stress of parts. The strain gauges are not encapsulated and are not suitable for actual railway applications. They are only suitable for laboratory research. Since the plane of the strain gauge is parallel to the strain surface of the splint, the strain of the splint is likely to tear the adhesive layer of the strain gauge, causing the strain gauge to fall off. Due to the small size of the strain gauge, it can only monitor the local strain of the splint and cannot monitor the strain of the entire strain area. Therefore, it is necessary to design a strain sensor suitable for actual railway applications. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides an elastic resistance strain sensor.

[0005] To achieve the above object, the utility model provides the following technical solution: an elastic resistance strain sensor, comprising a sensor body, and the sensor body is composed of a position holding beam, a right base block, a left base block, an elastic sleeve, a wire protection sleeve, a signal cable, a fixed magnet, an elastic sensitive curved piece, and a resistive strain gauge;

[0006] The position holding beam is arranged at the bottommost, and right base block and left base block are respectively arranged at the top ends of both ends of the position holding beam. An elastic sleeve is connected between the right base block and the left base block, and fixed magnets are fixedly installed on the outer walls of the same side of the right base block and the left base block. One end of the left base block is connected with a wire protection sleeve along the direction of the elastic sleeve. A signal cable is arranged inside the wire protection sleeve. An elastic sensitive curved piece is installed inside the elastic sleeve between the right base block and the left base block, and a resistive strain gauge is installed on the elastic sensitive curved piece.

[0007] As a further improvement of the technical solution of the utility model, holding beam fixing screws are connected between the two ends of the position holding beam and the bottoms of the right base block and the left base block.

[0008] As a further improvement of the technical solution of the utility model, screw holes are arranged inside the position holding beam corresponding to the connection positions of each holding beam fixing screw, and screw holes are also arranged at the bottoms of the right base block and the left base block corresponding to the connection positions of the holding beam fixing screws.

[0009] As a further improvement of the technical solution of the present utility model, the elastic sensitive curved piece is an elastic deformation part structure made of an elastic stainless steel sheet and formed into an arch shape.

[0010] As a further improvement of the technical solution of the present utility model, the cross section of the fixed permanent magnet is coated with epoxy glue and is adsorbed and fixed on the clamping plate.

[0011] As a further improvement of the technical solution of the present utility model, magnetic steel fixing screws are connected between the fixed permanent magnet and the right base block and the left base block, and screw holes are provided at the corresponding connection positions of the magnetic steel fixing screws inside the fixed permanent magnet and inside the right base block and the left base block.

[0012] As a further improvement of the technical solution of the present utility model, two resistive strain gauges are provided and are respectively adhered to the upper and lower surfaces at the highest point of the arch of the elastic sensitive curved piece with thermosetting glue.

[0013] The beneficial effects of the present utility model:

[0014] The elastic resistive strain type sensor designed by the present utility model can adapt to the influence of the railway open-air environment and various vibrations during train operation, can monitor the entire strain area, is not easy to fall off, is firmly fixed, is suitable for actual railway applications, has a simple structural design and is easy to assemble. Description of the drawings

[0015] Figure 1 It is a structural schematic diagram of the present utility model.

[0016] Figure 2 It is a structural schematic diagram of the other side of the present utility model.

[0017] Figure 3 It is a structural schematic diagram of the present utility model after the elastic sleeve is removed.

[0018] Figure 4 It is a structural schematic diagram of the installation of the present utility model on the rail.

[0019] The reference numerals are: 1, sensor body; 2, position holding beam; 3, right base block; 4, left base block; 5, holding beam fixing screw; 6, elastic sleeve; 7, wire protection sleeve; 8, signal cable; 9, fixed permanent magnet; 10, magnetic steel fixing screw; 11, elastic sensitive curved piece; 12, resistive strain gauge. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0021] As shown in the attached Figures 1-4 elastic resistance strain sensor, which includes a sensor body 1. The sensor body 1 is composed of a position-holding beam 2, a right base block 3, a left base block 4, an elastic sleeve 6, a wire protection sleeve 7, a signal cable 8, a fixed magnet 9, an elastic sensitive curved piece 11, and a resistive strain gauge 12.

[0022] The position-holding beam 2 is arranged at the bottommost part. At the top ends of both ends of the position-holding beam 2, a right base block 3 and a left base block 4 are respectively arranged. An elastic sleeve 6 is connected between the right base block 3 and the left base block 4. Fixed magnets 9 are fixedly installed on the outer walls of the same side of the right base block 3 and the left base block 4. One end of the left base block 4 is connected with a wire protection sleeve 7 along the direction of the elastic sleeve 6. A signal cable 8 is arranged inside the wire protection sleeve 7. An elastic sensitive curved piece 11 is installed inside the elastic sleeve 6 between the right base block 3 and the left base block 4. A resistive strain gauge 12 is installed on the elastic sensitive curved piece 11.

[0023] Among them, the elastic sleeve 6 plays a role in protecting sensitive components and has a certain elasticity, which will not affect the transmission of strain. The signal cable is used to transmit the sensitive strain signal of the resistive strain gauge 12 and is protected by the wire protection sleeve 7.

[0024] As shown in the attached Figure 1 and the attached Figure 3 As shown, holding beam fixing screws 5 are connected between the two ends of the position-holding beam 2 and the bottoms of the right base block 3 and the left base block 4. Screw holes are arranged inside the position-holding beam 2 corresponding to the connection positions of each holding beam fixing screw 5. Screw holes are also arranged at the bottoms of the right base block 3 and the left base block 4 corresponding to the connection positions of the holding beam fixing screws 5. The left and right base blocks are the load-bearing parts of the sensor, which play a role in fixing and supporting the positions of various parts and have the function of transmitting the strain of the clamping plate.

[0025] The position-holding beam 2 is mainly used to connect the position-holding beam after the sensor is assembled successfully to fix the relative positions of the left and right base blocks and keep them unchanged, so as to ensure that when the sensor is packaged and transported, the relative positions of the left and right base blocks are certain and the performance of the sensitive components is not damaged. After the sensor is fixed on the clamping plate, then loosen the holding beam fixing screws 5 and remove the position-holding beam 2, and the sensor can normally sense the strain of the clamping plate.

[0026] As shown in the attachedFigure 3 As shown, the elastic sensitive curved piece 11 is an elastic deformation part structure made of an elastic stainless steel sheet in an arch shape, used to transmit the strain of the splint to the resistive strain gauge 12, expand the measurement range of the strain, and increase the measuring range of the sensor.

[0027] As attached Figures 1-4 As shown, the fixed permanent magnet 9 is a magnetic adsorption fixing part that can fix the sensor on the splint. When fixing the sensor, first apply epoxy glue to the cross-section of the fixed permanent magnet 9, and adsorb it on the splint according to the required position. After the epoxy glue cures, it is completely fixed successfully. The fixing is convenient and fast, and it does not damage the splint. Moreover, it has a small volume and does not affect the train operation.

[0028] As attached Figure 3 As shown, magnetic steel fixing screws 10 are connected between the fixed permanent magnet 9 and the right base block 3 and the left base block 4, and screw holes are provided at the connections corresponding to the magnetic steel fixing screws 10 inside the fixed permanent magnet 9 and inside the right base block 3 and the left base block 4.

[0029] As attached Figure 3 As shown, two resistive strain gauges 12 are provided, and are respectively adhered to the upper and lower surfaces of the highest point of the arch of the elastic sensitive curved piece 11 with thermosetting glue to improve the accuracy and sensitivity of the sensor.

[0030] Working principle: The present utility model designs an elastic resistive strain type sensor, and the specific structure is as shown in the attached drawings of the specification Figures 1-4 As shown, in this technical solution, when assembling the sensor body 1, ensure that the resistive strain gauge 12 is completely attached to the elastic sensitive curved piece 11 and is firmly bonded to prevent glue opening during application, resulting in detection errors. Connect the signal cable 8, pass it through the elastic sleeve 6 and the wire protection sleeve 7, fix the sensitive component on the left and right base blocks, then fix the fixed permanent magnet 9 and the position maintaining beam 2, and perform packaging and transportation. Start installing the sensor body 1 on the splint. First, apply epoxy glue on the fixed permanent magnet 9, then align the notch of the position maintaining beam 2 with the center line of the splint, adsorb the sensor body 1 on the lower flange of the splint. After the epoxy glue cures, remove the position maintaining beam 2, connect the signal cable 8 to the signal acquisition box, and the sensor can work normally.

[0031] Among them, in the attached drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments of the present disclosure are involved. For other structures, reference can be made to the usual designs. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0032] Finally: The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Elastic resistive strain sensor, comprising a sensor body (1), characterized in that: The sensor body (1) is composed of a position - holding beam (2), a right base block (3), a left base block (4), an elastic sleeve (6), a wire - protecting sleeve (7), a signal cable (8), a fixed permanent magnet (9), an elastic sensitive curved piece (11), and a resistive strain gauge (12). The position - holding beam (2) is arranged at the bottommost part. At the top ends of both ends of the position - holding beam (2), a right base block (3) and a left base block (4) are respectively arranged. An elastic sleeve (6) is connected between the right base block (3) and the left base block (4). Fixed permanent magnets (9) are fixedly installed on the outer walls of the same side of the right base block (3) and the left base block (4). One end of the left base block (4) is connected with a wire - protecting sleeve (7) along the direction of the elastic sleeve (6). A signal cable (8) is arranged inside the wire - protecting sleeve (7). An elastic sensitive curved piece (11) is installed inside the elastic sleeve (6) between the right base block (3) and the left base block (4). A resistive strain gauge (12) is installed on the elastic sensitive curved piece (11).

2. The elastic resistive strain sensor according to claim 1, wherein: Retention beam fixing screws (5) are connected between the two ends of the position - holding beam (2) and the bottoms of the right base block (3) and the left base block (4).

3. The elastic resistive strain sensor according to claim 2, wherein: Screw holes are arranged inside the position - holding beam (2) corresponding to the connection positions of each retention beam fixing screw (5). Screw holes are also arranged at the bottoms of the right base block (3) and the left base block (4) corresponding to the connection positions of the retention beam fixing screws (5).

4. The elastic resistive strain sensor according to claim 1, wherein: The elastic sensitive curved piece (11) is an elastic deformation part structure made of an elastic stainless steel sheet and formed into an arch shape.

5. The elastic resistive strain sensor according to claim 1, characterized in that: The cross - section of the fixed permanent magnet (9) is coated with epoxy glue and is adsorbed and fixed on the splint.

6. The elastic resistive strain sensor according to claim 1, wherein: Magnet fixing screws (10) are connected between the fixed permanent magnet (9) and the right base block (3) and the left base block (4). Screw holes are arranged inside the fixed permanent magnet (9) and the right base block (3) and the left base block (4) corresponding to the connection positions of the magnet fixing screws (10).

7. The elastic resistive strain sensor according to claim 6, wherein: There are two resistive strain gauges (12), which are respectively adhered to the upper and lower surfaces at the highest point of the arch of the elastic sensitive curved piece (11) with thermosetting glue.

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