Modular pressure sensor device of subway vehicle axle

Abstract

The utility model discloses a modularization pressure sensor device of subway vehicle axle relates to railway vehicle system pressure instrument technical field, concretely including measuring portion and transformation portion, measuring portion includes piezoresistive diaphragm, piezoresistive diaphragm is located in the inner cavity of transformation portion, the piezoresistive diaphragm is equipped with the briquetting above, the briquetting is equipped with the pressure sensor, the pressure sensor device is equipped with the pressure sensor, and the pressure sensor is equipped with the pressure sensor. A guide rod is fixedly connected into an inner cavity of the variable pressure part, the pressing block is movably connected with the guide rod, the bottom end of the guide rod is fixedly connected with a limiting block, and the limiting block limits the pressing block. According to the modularized pressure sensor device of the subway vehicle axle, through the arrangement of the variable pressure part and the adoption of the lever principle, the force applied to the variable resistance diaphragm by the vehicle axle is changed, the measuring range of the pressure sensor is increased, the pressure sensor is convenient to use, the position of the supporting rod is adjusted, the measuring range of the pressure sensor can be changed, and the measurement range of the pressure sensor can be changed. And the adaptability of the pressure sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicle system pressure instruments, in particular to a modular pressure sensor device for a subway vehicle axle. Background Art

[0002] Railway transportation and high-speed rail passenger transportation are the lifeblood of the national economy, and urban rail transit is of great significance for alleviating urban traffic congestion and improving the urban atmospheric environment. Axle pressure sensors have been widely used as pressure detection devices for monitoring subway axles.

[0003] Currently, the main types of pressure sensors disclosed are piezoresistive and piezoelectric. Piezoresistive pressure sensors utilize the piezoresistive effect of single-crystal silicon. Using a single-crystal silicon wafer as the elastic element, a set of equal-value resistors are diffused in specific directions on the single-crystal silicon diaphragm using integrated circuit technology. These resistors are then connected to form a bridge circuit, and the single-crystal silicon wafer is placed in the sensor cavity. When pressure changes, the single-crystal silicon strains, causing the strained resistors directly diffused on it to change proportionally to the measured pressure. The bridge circuit then generates a corresponding voltage output signal. When this type of pressure sensor is in use, external pressure directly acts on the elastic element of the pressure sensor. Under excessively high pressure, the pressure sensor is susceptible to damage. When the axle is in use, the axle temperature can affect the pressure sensor's detection accuracy and the reliability of the test results. Furthermore, the pressure sensor has a fixed measuring range, but the space on the axle is limited, making large-range pressure sensors too large to install. Smaller sensors have a limited measuring range, which hinders their usability. Based on this, the present application proposes a modular pressure sensor device for subway vehicle axles. Utility Model Content

[0004] The utility model provides a modular pressure sensor device for the axle of a subway vehicle, which solves the problems raised in the above background technology that the axle temperature will affect the detection accuracy of the pressure sensor, the external pressure directly acts on the elastic element of the pressure sensor, the pressure sensor is easily damaged under excessive pressure, and the measuring range of the pressure sensor is limited, which affects its use.

[0005] The utility model provides the following technical solutions: a modular pressure sensor device for the axle of a subway vehicle, comprising a measuring part and a transformer part, the measuring part comprising a piezoresistive diaphragm, the piezoresistive diaphragm being located in the inner cavity of the transformer part, a pressure block being provided above the piezoresistive diaphragm, a guide rod being fixedly connected to the inner cavity of the transformer part, the pressure block being movably connected to the guide rod, a limit block being fixedly connected to the bottom end of the guide rod, the limit block limiting the pressure block, a lifting rod being movably connected to a side of the inner cavity of the transformer part away from the piezoresistive diaphragm, a lifting block being fixedly connected to the top of the lifting rod, a contact block in contact with the axle being connected to the bottom of the lifting rod, the lifting block and the pressure block being connected by a lever, a support groove being evenly provided in the middle of the lever, a support rod being movably connected to the inner cavity of the support groove, and the other end of the support rod being fixedly connected to the interior of the transformer part.

[0006] Preferably, the outer surface of the lifting rod and the outer surface of the voltage transformation part are both wrapped with thermal insulation pads, and the inner wall of the voltage transformation part is inlaid with phase change particles.

[0007] Preferably, both ends of the lever are movably sleeved with connecting rods, and the lifting block and the pressing block are movably connected to the connecting rods.

[0008] Preferably, the support rod includes a support column movably connected to the support groove, the other end of the support column is movably sleeved with a fixed column, the inner wall of the transformer part is evenly fixedly connected with a fixed block, and the fixed column and the fixed block are connected by bolts.

[0009] Preferably, the outer ring of the guide rod is movably sleeved with a driven block, the driven block is located above the limiting block, and the driven block is fixedly connected to the pressing block.

[0010] Preferably, the bottom of the transformer part is movably connected to a screw rod, the outer ring of the screw rod is threadedly connected to a nut, the outer ring of the nut is fixedly connected to a positioning rod, the top of the positioning rod contacts the bottom of the transformer part, and when the bottom of the positioning rod contacts the contact block, the pressure block contacts the piezoresistive diaphragm but the piezoresistive diaphragm does not deform.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The modular pressure sensor device for subway vehicle axles uses a transformer unit and a lever principle to change the force applied by the vehicle axle to the variable resistance diaphragm, thereby increasing the measuring range of the pressure sensor and facilitating its use. Furthermore, the measuring range of the pressure sensor can be changed by adjusting the position of the support rod, thereby improving the adaptability of the pressure sensor.

[0013] 2. The modular pressure sensor device for the subway vehicle axle has a limit block and a driven block. The limit block can limit the position of the pressure block, so that the pressing force of the pressure block on the piezoresistive diaphragm is within the acceptable range of the piezoresistive diaphragm, which can reduce the probability of the piezoresistive diaphragm rupture due to excessive pressure. The setting of the thermal insulation pad and phase change particles can keep the ambient temperature around the varistor diaphragm stable, reduce the influence of the axle temperature on the pressure sensor, and ensure the measurement accuracy of the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the structure of the utility model;

[0015] Figure 2 For the utility model structure Figure 1 Bottom schematic diagram;

[0016] Figure 3 For the utility model structure Figure 1 Internal schematic diagram;

[0017] Figure 4 For the utility model structure Figure 3 Schematic diagram on the right;

[0018] Figure 5 This is a schematic diagram of the structural support rod of the utility model.

[0019] In the figure: 1. Measuring part; 2. Voltage transformation part; 3. Contact block; 4. Screw rod; 5. Positioning rod; 6. Lifting rod; 7. Lifting block; 8. Connecting rod; 9. Fixed block; 10. Fixed column; 11. Support groove; 12. Piezoresistive diaphragm; 13. Pressure block; 14. Lever; 15. Follower block; 16. Limit block; 17. Guide rod; 18. Support column. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The utility model provides a modular pressure sensor device for a subway vehicle axle, comprising a measuring part 1 and a voltage transformation part 2. The measuring part 1 comprises a piezoresistive diaphragm 12, a main control board and a communication cable. The piezoresistive diaphragm 12 adopts a single crystal silicon wafer as an elastic element. On the single crystal silicon diaphragm, a group of equal-value resistors are diffused in a specific direction of the single crystal silicon using the process of integrated circuits, and the resistors are connected into a bridge circuit. When the pressure changes, the single crystal silicon generates strain, causing the strain resistors directly diffused thereon to generate changes proportional to the measured pressure. The corresponding voltage output signal is then obtained by the bridge circuit, and the voltage output signal is transmitted to the main control board. The main control board processes and uploads the signal, so that the signal is transmitted through the communication cable. The main control board can be an AT89S51 single-chip microcomputer.

[0022] The above-mentioned piezoresistive diaphragm 12 is located in the inner cavity of the transformer part 2, and a guide rod 17 is fixedly connected to the inner cavity of the transformer part 2. The outer ring of the bottom end of the guide rod 17 is fixedly connected to the limiting block 16. The outer ring of the guide rod 17 is movably sleeved with a driven block 15. The driven block 15 is located above the limiting block 16. The driven block 15 is fixedly connected to the pressure block 13. The pressure block 13 is located above the piezoresistive diaphragm 12. The limiting block 16 can limit the pressure block 13 through the driven block 15, so that the pressing force of the pressure block 13 on the piezoresistive diaphragm 12 is within the acceptable range of the piezoresistive diaphragm 12, which can reduce the probability of the piezoresistive diaphragm 12 rupturing due to excessive pressure.

[0023] A lifting rod 6 is movably connected to the side of the inner cavity of the transformer part 2 away from the piezoresistive diaphragm 12, a lifting block 7 is fixedly connected to the top of the lifting rod 6, and a contact block 3 in contact with the axle is connected to the bottom of the lifting rod 6. The contact block 3 is connected to the lifting rod 6 by a thread, and the contact block 3 can be replaced according to needs, so that the device can fit tightly with axles of various sizes when in use, thereby improving the adaptability of the device.

[0024] The lifting block 7 and the pressing block 13 are connected by a lever 14, and the two ends of the lever 14 are movably connected with a connecting rod 8. The lifting block 7 and the pressing block 13 are movably connected to the connecting rod 8, and the middle part of the lever 14 is evenly provided with a support groove 11. The inner cavity of the support groove 11 is movably connected with a support rod, and the other end of the support rod is fixedly connected to the inside of the transformer 2. Through the setting of the support rod, the support rod can limit the lever 14, so that when the lifting block 7 moves, it can drive the pressing block 13 to move in the opposite direction, and when the support rod is connected to the support groove 11 at different positions, the pressure of the pressing block 13 on the piezoresistive diaphragm 12 is different, so that the measurement range of the device can be changed, thereby improving the practicality of the device.

[0025] The support rod includes a support column 18 movably connected to the support slot 11. The other end of the support column 18 is movably connected to the fixed column 10. The inner wall of the transformer unit 2 is evenly fixedly connected to the fixed block 9. The fixed column 10 and the fixed block 9 are connected by bolts. The arrangement of the support rod and the fixed block 9 facilitates the user to change the position of the support rod. The distance between the fixed block 9 and the inner wall of the transformer unit 2 is not less than the thickness of the lever 14, which facilitates the separation of the support rod and the lever 14.

[0026] The outer surfaces of the lifting rod 6 and the outer surfaces of the transformer unit 2 are wrapped with thermal insulation pads. The provision of the thermal insulation pads can reduce the impact of the external environment on the internal environment of the transformer unit 2, thereby maintaining the ambient temperature around the piezoresistive diaphragm 12, and improving the operating accuracy of the piezoresistive diaphragm 12. The inner wall of the transformer unit 2 is inlaid with phase change particles, which can be solid-solid phase change materials. The provision of phase change particles can further stabilize the environment within the transformer unit 2. The solid-solid phase change material can be a supramolecular SSPCM.

[0027] The bottom of the transformer unit 2 is movably connected to a screw rod 4, the outer ring of which is threadedly connected to a nut, and the outer ring of the nut is fixedly connected to a positioning rod 5. When the top of the positioning rod 5 contacts the bottom of the transformer unit 2, and the bottom of the positioning rod 5 contacts the contact block 3, the pressure block 13 contacts the piezoresistive diaphragm 12 but the piezoresistive diaphragm 12 does not deform. Through the setting of the screw rod 4, the rotation of the screw rod 4 can change the position of the positioning rod 5. When the positioning rod 5 and the contact block 3 are staggered, the device can be used. When the positioning rod 5 moves above the contact block 3, the positioning rod 5 can position the contact block 3, preventing the pressure block 13 from pressing on the piezoresistive diaphragm 12 when the device is not in use, thereby facilitating the movement of the device.

[0028] To sum up: when the modular pressure sensor device of the subway vehicle axle is used, the staff adjusts the position of the support rod according to the needs, the staff fixes the measuring part 1 at the appropriate position of the subway vehicle, and makes the contact block 3 contact with the subway vehicle axle. The staff rotates the screw rod 4, and when the screw rod 4 rotates, it drives the positioning rod 5 to move until the positioning rod 5 and the contact block 3 are in a staggered state. During the operation of the subway vehicle, the axle will apply a certain pressure to the contact block 3. Under the action of pressure, the contact block 3 drives the lifting rod 6 to move, and the lifting rod 6 drives the lifting block 7 to move. The lifting block 7 drives the pressure block 13 to move through the lever 14. The pressure block 13 presses the piezoresistive diaphragm 12, and the piezoresistive diaphragm 12 generates strain, causing the strain resistor directly diffused on it to produce a change proportional to the measured pressure, and then the corresponding voltage output signal is obtained by the bridge circuit. The voltage output signal is transmitted to the main control board, and the main control board processes and uploads the signal, so that the signal is transmitted through the communication cable to realize the detection of the axle pressure of the subway vehicle.

[0029] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology and will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A modular pressure sensor device for a subway vehicle axle, comprising a measuring unit (1) and a voltage transformation unit (2), characterized in that: The measuring part (1) includes a piezoresistive diaphragm (12), the piezoresistive diaphragm (12) is located in the inner cavity of the transformer part (2), a pressure block (13) is provided above the piezoresistive diaphragm (12), a guide rod (17) is fixedly connected to the inner cavity of the transformer part (2), the pressure block (13) is movably connected to the guide rod (17), the bottom end of the guide rod (17) is fixedly connected to a limit block (16), the limit block (16) limits the pressure block (13), and the inner cavity of the transformer part (2) is far away. A lifting rod (6) is movably connected to one side of the piezoresistive diaphragm (12), a lifting block (7) is fixedly connected to the top of the lifting rod (6), a contact block (3) in contact with the axle is connected to the bottom of the lifting rod (6), the lifting block (7) and the pressure block (13) are connected via a lever (14), a support groove (11) is evenly provided in the middle of the lever (14), a support rod is movably connected to the inner cavity of the support groove (11), and the other end of the support rod is fixedly connected to the inside of the transformer (2).

2. The modular pressure sensor device for a subway vehicle axle according to claim 1, characterized in that: The outer surface of the lifting rod (6) and the outer surface of the voltage transformation part (2) are both wrapped with heat insulation pads, and the inner wall of the voltage transformation part (2) is inlaid with phase change particles.

3. The modular pressure sensor device for a subway vehicle axle according to claim 1, characterized in that: Both ends of the lever (14) are movably sleeved with a connecting rod (8), and the lifting block (7) and the pressing block (13) are movably connected to the connecting rod (8).

4. The modular pressure sensor device for a subway vehicle axle according to claim 1, characterized in that: The support rod comprises a support column (18) movably connected to the support groove (11); the other end of the support column (18) is movably sleeved with a fixing column (10); the inner wall of the transformer (2) is evenly fixedly connected with a fixing block (9); the fixing column (10) and the fixing block (9) are connected by bolts.

5. The modular pressure sensor device for a subway vehicle axle according to claim 1, characterized in that: The outer ring of the guide rod (17) is movably sleeved with a driven block (15), the driven block (15) is located above the limiting block (16), and the driven block (15) is fixedly connected to the pressing block (13).

6. The modular pressure sensor device for a subway vehicle axle according to claim 1, characterized in that: The bottom of the transformer part (2) is movably connected to a screw rod (4), the outer ring of the screw rod (4) is threadedly connected to a nut, and the outer ring of the nut is fixedly connected to a positioning rod (5), the top of the positioning rod (5) contacts the bottom of the transformer part (2), and when the bottom of the positioning rod (5) contacts the contact block (3), the pressure block (13) contacts the piezoresistive diaphragm (12) but the piezoresistive diaphragm (12) does not deform.

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