CN212645626U - Displacement measuring device - Google Patents

Abstract

The utility model relates to a sensor technical field, concretely relates to displacement measurement device, include pressure sensor and push-and-pull piece, pressure sensor is configured to fixed mounting, push-and-pull piece is configured to sliding installation, push-and-pull piece is configured with the elastic component, when pushing-and-pull piece removes the elastic component acts on pressure sensor, pressure sensor gives the controller with pressure signal transmission, the controller converts pressure variation into the displacement volume. The utility model provides a pair of displacement measurement device has improved measuring device's minimum discernment precision, simultaneously can effective reduce cost, extension device's life.

Description

Displacement measuring device

Technical Field

The utility model relates to a sensor technical field, concretely relates to displacement measurement device.

Background

An electronic ruler, also called a linear displacement sensor, is a device for converting a physical displacement quantity into an electric signal to measure the displacement.

An electronic ruler in the prior art is generally of a sliding resistance type or grating type structure, wherein a sliding resistance type utilizes a pull rope to drive a wheel shaft, a potentiometer in the center of the wheel shaft generates resistance change, and the pull-out distance of the pull rope is determined by measuring the voltage of the potentiometer; the grating type pull rule is digital relative code reading, the position of the pull rule is calculated by using a counter, a rule rod is required to drive a grating to move together, the precision of the grating type pull rule is determined according to the grating precision and the photoelectric tube precision, the characteristic limits the minimum identification precision of the grating rule, the length expressed by the pull rule can not be expressed by smaller resolution, the minimum identification precision of the grating rule is improved, and the cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve among the prior art low and with high costs technical problem of the minimum discernment precision of electronic ruler, provided a displacement measurement device, used this kind of displacement measurement device, improved minimum discernment precision, but extension fixture's life, reduce cost simultaneously.

The technical scheme of the utility model:

a displacement measuring device comprising:

a pressure sensor configured to be fixedly mounted;

the push-pull piece, the push-pull piece is configured to slidable mounting, the push-pull piece is configured with the elastic component, when the push-pull piece removes the elastic component acts on pressure sensor, pressure sensor transmits pressure signal for the controller, the controller converts pressure variation into the displacement volume.

When the push-and-pull piece removes, no matter be towards pressure sensor or keep away from pressure sensor, the elastic component all can act on pressure sensor, pressure sensor can receive the not big or small pressure that the elastic component applyed, and convert its pressure that receives into the signal of telecommunication and transmit the controller, the controller converts pressure variation into the displacement volume, and like this, the displacement measurement device of this application converts the displacement variation into pressure variation through the elastic component, then converts pressure variation into the signal of telecommunication through pressure sensor, final controller converts the signal of telecommunication into displacement volume output.

Further, the pressure sensor includes:

the cantilever support comprises a bearing part, a cantilever and a supporting part configured to be fixedly installed, the bearing part is connected with the supporting part through the cantilever, the push-pull part penetrates through the bearing part and is in clearance fit, and the elastic part is abutted against the bearing part under the action of the push-pull part;

a strain gage mounted on the cantilever.

Furthermore, the elastic part is a spring, the spring is sleeved on the push-pull part, one end of the spring is fixed relative to the push-pull part, and the other end of the spring presses the pressure sensor.

Preferably, the displacement measuring device further comprises a sliding sleeve, the sliding sleeve is fixedly installed on the bearing portion, and the sliding sleeve transmits the acting force of the elastic piece to the bearing portion.

Furthermore, one side of the cantilever support is fixedly provided with the sliding sleeve, the other side of the cantilever support is provided with a limiting part, and the limiting part is fixedly connected with the push-pull part.

Preferably, a fixed seat is arranged on the push-pull piece, and one end of the spring presses the fixed seat.

Further, the displacement measuring device further comprises a sampling circuit board, the sampling circuit board is provided with the controller, and the controller converts the pressure variation into displacement.

Furthermore, the sampling circuit board is also provided with an analog-to-digital conversion module and a digital interface, and the analog-to-digital conversion module converts the pressure signal into a displacement digital signal and outputs the displacement digital signal through the digital interface; meanwhile, the sampling circuit board is also provided with a digital processing module, a digital-to-analog conversion module and an analog interface, the digital processing module processes digital signals output by the analog-to-digital conversion module and outputs the digital signals to the digital-to-analog conversion module, and the digital-to-analog conversion module outputs displacement analog signals and outputs the displacement analog signals through the analog interface.

Further, the displacement measuring device further comprises a shell, the pressure sensor is fixedly installed in the shell, and at least one end of the push-pull piece is located on the outer side of the shell.

Further, at least a portion of the elastic member is located inside the housing.

After the technical scheme is adopted, the utility model provides a pair of displacement measurement device compares with prior art, has following beneficial effect:

(1) the displacement measuring device of the utility model has the advantages that the elastic piece is arranged on the push-pull piece, when the push-pull piece moves, the elastic piece acts on the pressure sensor, the pressure sensor converts the pressure variation into displacement output, the whole structure is simple, the cost is low, and meanwhile, the pressure sensor ensures that the minimum identification precision and the sensitivity of the utility model are higher;

(2) the utility model discloses in only need set up the coefficient of elasticity of spring and the parameter of cantilever support, can guarantee that the minimum recognition accuracy of measurement reaches 1um, and the minimum recognition accuracy of the electronic ruler among the prior art is about 25um, it is visible, the displacement measurement device's of the utility model minimum recognition accuracy is much higher than prior art, and the price of foil gage is lower simultaneously, can effectively practice thrift the cost;

(3) the sliding sleeve is fixedly arranged on the bearing part by means of the fixing hole, the sliding sleeve is equivalent to a sliding bearing, and the push-pull piece is in sliding fit with the sliding sleeve, so that friction is reduced, the movement of the push-pull rod is more flexible and faster, and meanwhile, the measurement error caused by the friction is reduced;

(4) the pressure bearing part, the cantilever and the supporting part of the utility model can be integrally formed, and the alloy steel is made of alloy steel, has higher strength, is not easy to generate plastic deformation when meeting the measuring range, and has good stability and high reliability;

(5) the utility model discloses a displacement measurement device both had been equipped with digital interface commonly used like the HDMI interface, was furnished with the analog interface again like the VGA interface, and suitable scene is extensive, and convenience of customers uses.

Drawings

Fig. 1 is a schematic structural diagram of a displacement measuring device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cantilever according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pressure sensor according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a displacement measuring device according to an embodiment of the present invention;

fig. 5 is a schematic view of the overall structure of a displacement measuring device (with a housing) according to an embodiment of the present invention.

Wherein the content of the first and second substances,

the pressure sensor 1, the cantilever support 11, the pressure bearing part 111, the cantilever 112, the supporting part 113 and the strain gauge 12;

the device comprises a push-pull piece 2, an elastic piece 21, a sliding sleeve 22, a limiting piece 23 and a fixed seat 24;

the shell 3, the sampling circuit board 31 and the connecting port 32.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1, the displacement measuring device of the present embodiment includes a pressure sensor 1 and a push-pull member 2, the push-pull member 2 is configured with an elastic member 21, the elastic member 21 is preferably a spring, the spring is sleeved on the push-pull member 2, the left end of the spring in fig. 1 is fixed relative to the push-pull member 2, and the right end of the spring acts on the pressure sensor 1. Further, the push-pull member 2 is configured to be installed in a sliding manner, when the push-pull member 2 moves, no matter the push-pull member moves towards the pressure sensor 1 or moves away from the pressure sensor 1, the spring can act on the pressure sensor 1, the pressure sensor 1 can receive different pressures applied by the spring, and convert the pressure received by the spring into an electric signal to be transmitted to the controller, and the controller converts the pressure variation into a displacement amount, so that the displacement measuring device of the embodiment converts the variation of the displacement into the pressure variation through the spring, then converts the pressure variation into a changed electric signal through the pressure sensor 1, and finally converts the changed electric signal into the displacement amount to be output by the controller.

It should be noted that the spring may be in a compressed state or in a stretched state, and in order to ensure the accuracy of the measurement, the spring of the present embodiment is preferably in a compressed state all the time, and the pressure sensor 1 is always under pressure.

The pressure sensor is a sensor which converts a pressure change signal into an electric signal to be output after sensing the pressure change, the pressure sensor usually adopts a strain gauge based on a strain effect or a piezoelectric crystal based on the piezoelectric effect to convert the pressure signal and the electric signal, the minimum identification precision of the piezoelectric crystal or the strain gauge can reach 0.1um or even less, and the minimum identification precision is the material property of the piezoelectric crystal or the strain gauge and does not need to depend on very high processing precision like a grating ruler. Only need set up pressure sensor's parameter in this embodiment, can guarantee that the minimum discernment precision of measurement reaches 1um, and the minimum discernment precision of the electronic ruler among the prior art is about 25um, and is visible, and the displacement measurement device's of this embodiment minimum discernment precision is higher than prior art a lot, and piezoelectric crystal or foil gage's price is lower simultaneously, can effectively practice thrift the cost.

It can be known from the above that, the displacement measuring device of this embodiment, through set up the spring on push-and-pull 2, when push-and-pull 2 moved, the spring acted on pressure sensor 1, and pressure sensor 1 converts the pressure variation into displacement volume output, and overall structure is simple, and is with low costs, and pressure sensor 1 makes the minimum recognition accuracy and the sensitivity of this embodiment higher simultaneously.

Preferably, as shown in fig. 2 and 3, the pressure sensor 1 of the present embodiment adopts a structure that the cantilever bracket 11 is combined with the strain gauge 12, the cantilever bracket 11 includes a bearing portion 111, a cantilever 112 and a supporting portion 113 configured to be fixedly installed, the bearing portion 111 is connected to the supporting portion 113 through the cantilever 112, the push-pull member 2 penetrates through the bearing portion 111 and is in clearance fit, and the elastic member 21 is pressed against the bearing portion 111 under the action of the push-pull member 2; specifically, as shown in fig. 2, the supporting portion 113 is square and hollow in the middle, four corners of the supporting portion 113 are provided with mounting holes for mounting the supporting portion onto a rigid object, and the pressure-bearing portion 111 is annular, is located in the hollow inside the supporting portion 113, and is connected to the supporting portion 113 through the cantilever 112.

Further, the strain gauge 12 is installed on the cantilever 112 in the present embodiment, after the cantilever 112 is ensured to be smooth and flat, the strain gauge 12 is bonded on the cantilever 112, and is clamped by a special fixture after the strain gauge 12 is tightly bonded, and meanwhile, the strain gauge 12 is uniformly coated with silica gel, so that the present embodiment displacement measurement device is waterproof and dustproof, and the service life of the present embodiment displacement measurement device is prolonged.

As shown in fig. 1-2, the middle hole of the annular pressure-bearing part 111 can accommodate the rod-shaped push-pull part 2 to move through, and the two parts are in clearance fit, when the push-pull part 2 moves, the elastic part 21 always abuts against the pressure-bearing part 111, the pressure-bearing part 111 can be bent to different degrees by different forces applied by the elastic part 21, the cantilever 112 can be deformed to different degrees, the strain gauge 12 can be deformed to different degrees, the resistance of the strain gauge can be changed correspondingly, and the controller calculates and outputs the displacement according to the detected voltage values at the two ends of the strain gauge 12.

It should be noted that, here only need set up the coefficient of elasticity of spring and the parameter of outrigger 11, can guarantee that the minimum recognition accuracy of measurement reaches 1um, and the whole conversion process of this embodiment is linear change simultaneously, including the deformation of spring, the deformation of outrigger 11 and the micro-deformation of foil gage, the calculation of being convenient for makes the output result more stable and accurate simultaneously.

Preferably, the pressure-bearing portion 111, the cantilever 112 and the support portion 113 may be integrally formed, and the material is alloy steel, which has high strength, and when the measurement range is satisfied, the alloy steel is not easily subjected to plastic deformation, and has good stability and high reliability.

Preferably, as shown in fig. 1, the displacement measuring device of the present embodiment further includes a sliding sleeve 22, the sliding sleeve 22 is fixedly mounted on the bearing part 111, and the sliding sleeve 22 transmits the force of the spring to the bearing part 111, so that the bearing part 111 is deformed. Specifically, as shown in fig. 2, the pressure receiving portion 111 is provided with a plurality of fixing holes, the sliding sleeve 22 can be fixedly mounted on the pressure receiving portion 111 through the fixing holes, the sliding sleeve 22 is equivalent to a sliding bearing, and the pushing and pulling member 2 and the sliding sleeve 22 are in sliding fit, so that friction is reduced, movement of the push-pull rod is flexible and rapid, and meanwhile, a measurement error caused by friction is reduced. It should be noted that, after the sliding sleeve 22 is adopted, the central hole of the bearing part 111 does not play a role in clearance fit, and the central hole of the bearing part 111 can be set to be larger than the outer diameter of the sliding sleeve 22, so that the requirement for the machining precision of the hole wall of the central hole is reduced.

Further, the sliding sleeve 22 of the present embodiment is installed on one side of the cantilever support 11, and a limiting member 23 is further disposed on the other side of the cantilever support 11, the limiting member 23 is fixed to the other end of the push-pull member 2, optionally but not limited to a threaded connection, and as shown in fig. 1, the limiting member 23 blocks the other end of the push-pull member 2 to be separated from the cantilever support 11 to the left, specifically, a limiting rod may be disposed on the limiting member 23, or the external dimension of the limiting member 23 is greater than the middle hole dimension of the pressing portion 111. Preferably, the position-limiting member 23 is against the cantilever 11 under the action of the spring, i.e. the zero position of the displacement measuring device of this embodiment.

Preferably, as shown in fig. 1, a fixing seat 24 is fixed at one end of the push-pull member 2, the fixing mode can be selected but not limited to a threaded connection, one end of the spring presses the fixing seat 24, and the other end of the spring presses the sliding sleeve 22, because the spring is always in a compressed state, during the movement of the push-pull member 2, one end of the spring is relatively fixed with the fixing seat 24 and cannot be separated, and of course, the two can also be directly fixed, specifically, but not limited to a welded fixing mode.

Further, as shown in fig. 1, in the use, with cantilever 11 fixed, mobile device drives the fixing base 24 like the driver of injection molding machine and removes alright carry out the displacement measurement, the fixing base 24 of this embodiment is the round platform form, wherein the less bottom surface of area is towards the spring side, the great bottom surface of area and driver contact, make fixing base 24 and driver be the face-to-face contact, as long as guarantee fixing base 24's bottom surface and push away and draw 2 perpendicular can guarantee that the driver is along the length direction displacement that pushes away and draw 2 all the time, the measuring result is more accurate, the error is littleer.

Further, as shown in fig. 4-5, the displacement measuring device of the present embodiment further includes a housing 3 and a sampling circuit board 31 disposed inside the housing 3, the sampling circuit board 31 is provided with a controller, the controller converts the pressure variation into a displacement, the sampling circuit board 31 is further provided with an analog-to-digital conversion module and a digital interface, the analog-to-digital conversion module converts the pressure signal into a displacement digital signal, and outputs the displacement digital signal through the digital interface; meanwhile, the sampling circuit board 31 is further provided with a digital processing module, a digital-to-analog conversion module and an analog interface, the digital processing module processes digital signals output by the analog-to-digital conversion module and outputs the digital signals to the digital-to-analog conversion module, and the digital-to-analog conversion module outputs displacement analog signals and outputs the displacement analog signals through the analog interface.

As shown in fig. 5, the pressure sensor 1 of the present embodiment is embedded in the housing 3, specifically, four corners of the supporting portion 113 of the cantilever 11 are provided with four mounting holes, the supporting portion 113 of the cantilever 11 is fixedly mounted in the housing 3 through the four mounting holes, one end of the push-pull member 2, i.e., the fixing seat 24, is located outside the housing 3, so that the displacement measurement can be performed by moving the fixing seat 24, and the housing 3 is also provided with a connecting port 32 for electrically connecting with other devices, such as a display.

Optionally, a part of the spring of the embodiment is disposed outside the housing 3, and certainly, the spring may be disposed entirely inside the housing 3, but a limiting seat similar to the fixing seat 24 needs to be disposed on the push-pull member inside the housing 3, so that the spring is compressed when the push-pull member moves, and thus the spring is not seen from the outside, the whole looks more beautiful, and the actual measurement is not affected.

Therefore, the displacement measuring device provided by the embodiment improves the minimum identification precision of measurement, and meanwhile, the cost can be effectively reduced, and the service life of the displacement measuring device is prolonged.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (10)

1. A displacement measuring device, comprising:

a pressure sensor (1), the pressure sensor (1) being configured to be fixedly mounted;

push away and draw piece (2), push away and draw piece (2) are configured as slidable mounting, push away and draw piece (2) configuration elastic component (21), push away when drawing piece (2) remove elastic component (21) act on pressure sensor (1), pressure sensor (1) transmits pressure signal for the controller, the controller converts pressure variation into the displacement volume.

2. A displacement measuring device according to claim 1, characterized in that the pressure sensor (1) comprises:

the cantilever support (11), the cantilever support (11) comprises a bearing part (111), a cantilever (112) and a supporting part (113) configured to be fixedly installed, the bearing part (111) is connected with the supporting part (113) through the cantilever (112), the push-pull part (2) penetrates through the bearing part (111) and is in clearance fit, and the elastic part (21) is pressed against the bearing part (111) under the action of the push-pull part (2);

a strain gauge mounted on the cantilever (112).

3. A displacement measuring device according to claim 1, characterized in that the elastic member (21) is a spring, the spring is sleeved on the push-pull member (2), one end of the spring is fixed relative to the push-pull member (2), and the other end of the spring presses the pressure sensor (1).

4. A displacement measuring device according to claim 2, further comprising a sliding sleeve (22), wherein the sliding sleeve (22) is fixedly mounted on the bearing portion (111), and the sliding sleeve (22) transmits the acting force of the elastic member (21) to the bearing portion (111).

5. A displacement measuring device according to claim 4, characterized in that the sliding sleeve (22) is fixedly mounted on one side of the cantilever support (11), and a limiting member (23) is arranged on the other side of the cantilever support (11), and the limiting member (23) is fixedly connected with the push-pull member (2).

6. A displacement measuring device according to claim 3, characterized in that the push-pull member (2) is provided with a fixing seat (24), and one end of the spring presses against the fixing seat (24).

7. The displacement measuring device according to claim 1, further comprising a sampling circuit board (31), wherein the controller is disposed on the sampling circuit board (31), and the controller converts the pressure variation into a displacement.

8. The displacement measuring device according to claim 7, wherein the sampling circuit board (31) is further provided with an analog-to-digital conversion module and a digital interface, and the analog-to-digital conversion module converts the pressure signal into a displacement digital signal and outputs the displacement digital signal through the digital interface; meanwhile, the sampling circuit board (31) is also provided with a digital processing module, a digital-to-analog conversion module and an analog interface, the digital processing module processes digital signals output by the analog-to-digital conversion module and outputs the digital signals to the digital-to-analog conversion module, and the digital-to-analog conversion module outputs displacement analog signals and outputs the displacement analog signals through the analog interface.

9. A displacement measuring device according to claim 1, characterized in that the displacement measuring device further comprises a housing (3), the pressure sensor (1) is fixedly mounted in the housing (3), and at least one end of the push-pull member (2) is located outside the housing (3).

10. A displacement measuring device according to claim 9, characterized in that the resilient member (21) is located at least partly inside the housing (3).

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