CN211904493U - Force and linear displacement sensor - Google Patents
Force and linear displacement sensor Download PDFInfo
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- CN211904493U CN211904493U CN202020591044.7U CN202020591044U CN211904493U CN 211904493 U CN211904493 U CN 211904493U CN 202020591044 U CN202020591044 U CN 202020591044U CN 211904493 U CN211904493 U CN 211904493U
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Abstract
The utility model discloses a force and linear displacement sensor, a first inner cavity and a second inner cavity which are mutually independent are arranged in a shell, a first permanent magnet and a pressure-sensitive sensor are arranged in the first inner cavity, a first end of the shell is provided with a mobile device, the mobile device is provided with a second permanent magnet which can move in the axial direction of the shell and is close to the first permanent magnet, and the magnetism of one end of the second permanent magnet, which is close to the first permanent magnet, is the same; the circuit board is arranged in the second inner cavity, and the pressure-sensitive sensor is correspondingly connected with a central processing unit on the circuit board. The utility model discloses a repulsion between the permanent magnet is utilized in the design and the structure that reaction distance changes is changed, forms non-contact's detection structure, does not have the friction and wear, and the product is longe-lived to can detect the linear displacement volume simultaneously and receive the size of effort, a sensor has two kinds of sensor functions concurrently, and the structure is comparatively simple moreover, easy to carry out, receives environmental impact less.
Description
Technical Field
The utility model relates to a sensor especially relates to a can detect power and linear displacement sensor of effort and linear displacement simultaneously.
Background
The force sensor and the linear displacement sensor are widely applied and are respectively used for detecting the acting force applied to an object and the linear displacement distance of the object, for example, the force sensor is of a strain tube type, a strain beam type, a diaphragm type, a combined type and the like, and the linear displacement sensor is of a resistance type linear displacement sensor, an LVDT differential pressure type linear displacement sensor, an ultrasonic displacement sensor, a grating type linear displacement sensor and the like.
The linear displacement sensor has certain limitations in the aspect of detecting linear displacement, for example, the service life of the resistance type linear displacement sensor is not long, and the linearity of the sensor is reduced by friction force in the using process, even the resistor body is in poor contact; the ultrasonic displacement sensor has specific requirements on the shape of an object to be detected, and the measurement frequency and the measurement precision of the ultrasonic displacement sensor can be influenced by the propagation speed of sound in the air; the manufacturing process of the grating linear displacement sensor is complex and difficult, and is easily influenced by environmental factors; although there are many advantages to LVDT differential transformer type linear displacement sensors, they cannot detect the amount of force applied by the amount of displacement.
In summary, the conventional linear displacement sensor cannot detect the linear displacement of the target object and the magnitude of the applied force at the same time, and the conventional force sensor cannot detect the linear displacement of the target object, so that no sensor capable of detecting the applied force and the linear displacement at the same time exists at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can detect effort and linear displacement's power and linear displacement sensor simultaneously just in order to solve above-mentioned problem.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a force and linear displacement sensor comprises a shell and a circuit board, and further comprises a first permanent magnet and a pressure sensitive sensor, wherein a first inner cavity and a second inner cavity which are independent of each other are arranged in the shell, the first permanent magnet and the pressure sensitive sensor are arranged in the first inner cavity, the pressure sensitive sensor is used for detecting the pressure of the first permanent magnet, the axial direction of the shell is set to be the same direction as the arrangement direction of the first permanent magnet and the pressure sensitive sensor, a moving device is arranged at the first end of the shell, a second permanent magnet which can move in the axial direction of the shell and is close to the first permanent magnet is arranged on the moving device, and the magnetism of one end, close to each other, of the second permanent magnet is the same as that of the first permanent magnet; the circuit board is arranged in the second inner cavity, and the signal output end of the pressure-sensitive sensor is correspondingly connected with the signal input end of the central processing unit on the circuit board.
In the structure, the pressure-sensitive sensor is used for detecting the pressure generated by the first permanent magnet on the pressure-sensitive sensor, and the repulsive force between the first permanent magnet and the second permanent magnet changes along with the change of the distance between the first permanent magnet and the second permanent magnet, so that the purpose of detecting the linear displacement of the second permanent magnet can be realized by detecting the change of the repulsive force between the first permanent magnet and the second permanent magnet; the structure does not specifically describe a shell structure, the shell can be designed into two half structures according to the requirements of installation of all parts, the shell can also be designed into a side wall cover plate structure, the shell can also be designed into a structure that the second end of the shell is provided with an opening, a partition plate is installed inside the shell, the partition plate is connected with the shell through countersunk screws, and the like, and the structure is a conventional structure which is arranged according to the requirements.
Further, in order to avoid the influence of the shell on the magnetic field as much as possible, through holes are formed in the cavity wall of the first inner cavity and in positions corresponding to the positions between the second permanent magnet and the first permanent magnet.
Preferably, for ease of installation, the second cavity is aligned with the first cavity in the axial direction of the housing, and the second cavity is located on a side close to the second end of the housing.
According to the actual need, the mobile device includes carriage release lever and slider, the first end of shell is equipped with the casing, be equipped with in the casing with the coaxial casing inner chamber of shell, the outer end of carriage release lever is arranged in outside the casing, the inner of carriage release lever passes arrange in behind the corresponding through-hole on the casing inner chamber and with the slider is connected, the slider quilt the casing inner chamber is spacing and can the axial direction free movement of shell, the second permanent magnet is installed on the slider. The moving device needs to connect an external object to be detected with the outer end of the moving rod, and the moving stroke of the moving rod is large, so that relatively speaking, more space is occupied.
Or, mobile device includes slide bar and sliding sleeve, the first end of slide bar with the first end of shell connect and with the shell is coaxial, the sliding sleeve is in through self through-hole suit the slide bar is outer and can the axial direction free slip of slide bar, the second permanent magnet is installed on the sliding sleeve. When the moving device is used, an external object to be detected is connected with the sliding sleeve, and the moving stroke of the sliding sleeve is within the length range of the sliding sleeve, so that the occupied space is relatively small.
Preferably, in order to facilitate installation, the sliding sleeve is an annular hollow sleeve, the second permanent magnet is an annular permanent magnet, and the second permanent magnet is installed in the sliding sleeve.
Furthermore, in order to avoid the sliding sleeve from being separated from the sliding rod, a stop block used for stopping the sliding sleeve is arranged at the second end of the sliding rod.
The beneficial effects of the utility model reside in that:
the utility model discloses a repulsion between the permanent magnet is utilized in the design and the structure that reaction distance changes is changed, forms non-contact's detection structure, does not have the friction and wear, and the product is longe-lived to can detect the linear displacement volume simultaneously and receive the size of effort, a sensor has two kinds of sensor functions concurrently, and the structure is comparatively simple moreover, easy to carry out, receives environmental impact less.
Drawings
Fig. 1 is a schematic sectional view of a force and linear displacement sensor according to embodiment 1 of the present invention, in which a countersunk head screw is not installed;
fig. 2 is a schematic sectional view of the force and linear displacement sensor according to embodiment 2 of the present invention, in which the countersunk head screw is not installed.
Detailed Description
The invention will be further described with reference to the following examples and drawings:
example 1:
as shown in fig. 1, a force and linear displacement sensor includes a housing 8 and a circuit board 9, and further includes a first permanent magnet 6 and a pressure sensitive sensor 7, where the housing 8 is provided with a first inner cavity (not marked in the figure) and a second inner cavity (not marked in the figure) that are independent of each other, the first permanent magnet 6 and the pressure sensitive sensor 7 are disposed in the first inner cavity, and the pressure sensitive sensor 7 is used for detecting the pressure of the first permanent magnet 6, the axial direction of the housing 8 is set to be the same as the arrangement direction of the first permanent magnet 6 and the pressure sensitive sensor 7, a moving device is disposed at a first end of the housing 8, a second permanent magnet 4 that can move in the axial direction of the housing 8 and is close to the first permanent magnet 6 is mounted on the moving device, and the magnetism of one end of the second permanent magnet 4 that is close to the; the circuit board 9 is arranged in the second inner cavity, and the signal output end of the pressure-sensitive sensor 7 is correspondingly connected with the signal input end of a central processing unit (not shown) on the circuit board 9; a through hole 16 is formed in the cavity wall of the first inner cavity at a position corresponding to the position between the second permanent magnet 4 and the first permanent magnet 6; the moving device comprises a moving rod 1 and a sliding block 3, a shell 2 is arranged at the first end of a shell 8, the shell 8 and the shell 2 can be independently connected and can also be integrated, namely the first end of the shell 8 extends to obtain the shell 2, the second structure is adopted in the embodiment, a shell inner cavity coaxial with the shell 8 is arranged in the shell 2, the outer end of the moving rod 1 is arranged outside the shell 2, the inner end of the moving rod 1 penetrates through a corresponding through hole in the shell 2 and then is arranged in the shell inner cavity and is connected with the sliding block 3, the sliding block 3 is limited by the shell inner cavity and can freely move in the axial direction of the shell 8, and a second permanent magnet 4 is arranged on the sliding block 3; in order to facilitate the installation of the internal parts, the second end of the housing 8 is designed to be an opening, a plurality of partition plates 5 are arranged in the housing as required, and the partition plates 5 are connected with the housing 8 through countersunk head screws 10, so that the internal parts can be installed in the housing 8 and the shell 2 from bottom to top.
Also shown in fig. 1 is a plug connector 11 of conventional construction for corresponding connection to the circuit board 9.
As shown in fig. 1, when in use, a detected object which needs to detect the linear displacement and/or the magnitude of the acting force is connected with the outer end of the movable rod 1, and the detected object moves in the axial direction of the housing 8 to drive the movable rod 1 to move, so as to drive the sliding block 3 and the second permanent magnet 4 to move in the axial direction of the housing 8; since the magnetism of the ends of the first permanent magnet 6 and the second permanent magnet 4, which are close to each other, is the same, there is a repulsive force between the two, the larger the distance between the two is, the smaller the repulsive force is, the smaller the distance is, the larger the repulsive force is, and in the moving process of the second permanent magnet 4, the repulsive force between the two changes along with the distance, the repulsive force can generate thrust to both the first permanent magnet 6 and the second permanent magnet 4, the thrust borne by the second permanent magnet 4 is overcome by the detected object, the thrust borne by the first permanent magnet 6 is transmitted to the pressure-sensitive sensor 7 in a pressure form, the pressure-sensitive sensor 7 transmits a detected pressure signal to the central processing unit on the circuit board 9, the central processing unit processes the received signal to obtain the moving distance of the second permanent magnet 4, therefore, the moving distance data of the detected object is obtained, the linear displacement of the detected object is obtained, and the purpose of detecting the linear displacement is achieved. When the acting force on the detected object is detected, the central processing unit subtracts the initial pressure detected before the detected object moves from the balance pressure detected after the detected object moves and is in a balance state, and then the acting force value on the detected object can be obtained.
Example 2:
as shown in fig. 2, a force and linear displacement sensor includes a housing 8 and a circuit board 9, and further includes a first permanent magnet 6 and a pressure sensitive sensor 7, where the housing 8 is provided with a first inner cavity (not marked in the figure) and a second inner cavity (not marked in the figure) that are independent of each other, the first permanent magnet 6 and the pressure sensitive sensor 7 are disposed in the first inner cavity, and the pressure sensitive sensor 7 is used for detecting the pressure of the first permanent magnet 6, the axial direction of the housing 8 is set to be the same as the arrangement direction of the first permanent magnet 6 and the pressure sensitive sensor 7, a moving device is disposed at a first end of the housing 8, a second permanent magnet 4 that can move in the axial direction of the housing 8 and is close to the first permanent magnet 6 is mounted on the moving device, and the magnetism of one end of the second permanent magnet 4 that is close to the; the circuit board 9 is arranged in the second inner cavity, and the signal output end of the pressure-sensitive sensor 7 is correspondingly connected with the signal input end of a central processing unit (not shown) on the circuit board 9; a through hole 17 is formed in the cavity wall of the first inner cavity at a position corresponding to the position between the second permanent magnet 4 and the first permanent magnet 6; the moving device comprises a sliding rod 15 and a sliding sleeve 13, wherein a first end (the lower end in the figure) of the sliding rod 15 is connected with a first end of the shell 8 through threads and is coaxial with the shell 8, the sliding sleeve 13 is an annular hollow sleeve, the sliding sleeve 13 is sleeved outside the sliding rod 15 through a through hole of the sliding sleeve 13 and can freely slide in the axial direction of the sliding rod 15, the second permanent magnet 14 is an annular permanent magnet, the second permanent magnet 14 is installed in the sliding sleeve 13, and a stop 14 for stopping the sliding sleeve 12 is arranged at a second end (the upper end in the figure) of the sliding rod 15; in order to facilitate the installation of the internal components, the second end of the housing 8 is designed as an opening, a plurality of partition plates (not marked in the figure) are arranged in the housing as required, and the partition plates are connected with the housing 8 through countersunk head screws 10, so that the internal components can be installed in the housing 8 from bottom to top.
Also shown in fig. 1 is a plug connector 11 of conventional construction for corresponding connection to the circuit board 9.
Description of the drawings: since the through holes 17 in fig. 2 are arranged at different positions from the through holes 16 in fig. 1, and the second permanent magnets 14 in fig. 2 are different in shape from the second permanent magnets 4 in fig. 1, the present embodiment uses different reference numerals from embodiment 1, but names and functions of corresponding parts are the same.
As shown in fig. 2, when in use, the detected object which needs to detect the linear displacement and/or the magnitude of the acting force is connected to the sliding sleeve 15, and the detected object moves in the axial direction of the housing 8 to drive the sliding sleeve 15 to move, so as to drive the second permanent magnet 14 to move in the axial direction of the housing 8; since the first permanent magnet 6 and the second permanent magnet 14 have the same magnetism at the ends close to each other, there is a repulsive force therebetween, and the larger the distance between the two is, the smaller the repulsive force is, the smaller the distance is, the larger the repulsive force is, during the movement of the second permanent magnet 14, the repulsive force between the two changes accordingly, the repulsive force can generate thrust to both the first permanent magnet 6 and the second permanent magnet 14, the thrust borne by the second permanent magnet 14 is overcome by the detected object, the thrust borne by the first permanent magnet 6 is transmitted to the pressure-sensitive sensor 7 in a pressure form, the pressure-sensitive sensor 7 transmits a detected pressure signal to a central processing unit on the circuit board 9, the central processing unit processes the received signal to obtain the moving distance of the second permanent magnet 14, therefore, the moving distance data of the detected object is obtained, the linear displacement of the detected object is obtained, and the purpose of detecting the linear displacement is achieved. When the acting force on the detected object is detected, the central processing unit subtracts the initial pressure detected before the detected object moves from the balance pressure detected after the detected object moves and is in a balance state, and then the acting force value on the detected object can be obtained.
Description of the drawings: the working principle of the two embodiments is based on that the sensor is in a static state and the axial direction of the shell 8 is in a horizontal direction, because the pressure-sensitive sensor 7 is subjected to a repulsive force between the first permanent magnet 6 and the second permanent magnet 4 or 14 in this case, and no interference of other external forces exists.
But probably be in the environment that has positive (or burden) acceleration to remove during in the in-service use, in order to avoid the sensor to be in the not enough problem of detection precision that acceleration motion environment brought as far as possible, the utility model discloses can also introduce the accelerometer, the accelerometer can assist and solve this sensor and lead to detecting inaccurate problem when receiving the external force that positive (or burden) acceleration produced, but its detection inaccurate problem that can't overcome other external force influences and lead to. The following description is made in detail with reference to the optimized circuit structure and the operation principle of the circuit board 9, but the following description is only an optimized supplement of the present invention and is not an object of the present invention.
The circuit board 9 is provided with a central processing unit, an accelerometer, an analog-to-digital conversion circuit and a communication circuit, signals of the pressure-sensitive sensor 7 are analog signals, the analog signals are converted into digital signals through the analog-to-digital conversion circuit and then transmitted to the central processing unit, the accelerometer collects acceleration signals received by the sensor and transmits the acceleration signals to the central processing unit, the central processing unit sends related information to external equipment through the communication circuit after processing and calculating, and the communication circuit can be a wired communication circuit or a wireless communication circuit.
After the accelerometer is used, the distance d between the first permanent magnet 6 and the second permanent magnet 4 or 14 can be calculated using the following calculation:
in the above formula, Br1、Br2The remanence of the second permanent magnet 4 and the first permanent magnet 6, respectively; a. them1、Am2The mass of the second permanent magnet 4 and the mass of the first permanent magnet 6, respectively; r is the radius of the second permanent magnet 4 and the first permanent magnet 6, and if the radius is not equal to the radius of the first permanent magnet 6, the average value is taken; l is the thickness of the second permanent magnet 4 and the first permanent magnet 6, and if the two are not equal, the average value is taken; mu.s0Is a vacuum magnetic conductivity; a is a correction coefficient, the size of the correction coefficient is adjusted according to the radius R of the second permanent magnet and the radius R of the first permanent magnet, and the larger R is, the larger the corresponding correction coefficient is; m represents the mass of the first permanent magnet 6, aAddingWhich represents the resultant acceleration value in the axial direction of the housing 8 calculated from the acceleration values collected by the accelerometer.
The central processing unit calculates the difference between d obtained after the movement is generated and d before the movement is generated, the absolute value of the difference is the detected linear displacement, and is also the linear displacement of the second permanent magnet 4 or 14, and the moving direction is as follows: if d obtained after the movement is larger than d before the movement is generated, the movement is performed in a direction close to the first permanent magnet 6, and otherwise, the movement is performed in a direction away from the first permanent magnet 6.
Therefore, the calculation result can be corrected through the correction coefficient corresponding to the information acquired by the accelerometer, and the problem of insufficient detection precision caused by the fact that the sensor is in an acceleration motion environment is solved.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.
Claims (7)
1. The utility model provides a force and linear displacement sensor, includes shell and circuit board, its characterized in that: the pressure-sensitive sensor is used for detecting the pressure of the first permanent magnet, the axial direction of the shell is the same as the arrangement direction of the first permanent magnet and the pressure-sensitive sensor, a moving device is arranged at the first end of the shell, a second permanent magnet which can move in the axial direction of the shell and is close to the first permanent magnet is mounted on the moving device, and the magnetism of one end, close to the first permanent magnet, of the second permanent magnet is the same as that of one end, close to the first permanent magnet, of the first permanent magnet; the circuit board is arranged in the second inner cavity, and the signal output end of the pressure-sensitive sensor is correspondingly connected with the signal input end of the central processing unit on the circuit board.
2. The force and linear displacement sensor of claim 1, wherein: and through holes are formed in the cavity wall of the first inner cavity and correspond to the positions between the second permanent magnet and the first permanent magnet.
3. The force and linear displacement sensor of claim 1, wherein: the second inner cavity and the first inner cavity are arranged in the axial direction of the shell, and the second inner cavity is positioned on one side close to the second end of the shell.
4. The force and linear displacement sensor of claim 1, 2 or 3, wherein: the mobile device comprises a moving rod and a sliding block, a shell is arranged at the first end of the shell, a shell inner cavity which is coaxial with the shell is arranged in the shell, the outer end of the moving rod is arranged outside the shell, the inner end of the moving rod penetrates through a corresponding through hole in the shell and then is arranged in the shell inner cavity and is connected with the sliding block, the sliding block is limited by the shell inner cavity and can freely move in the axial direction of the shell, and the second permanent magnet is arranged on the sliding block.
5. The force and linear displacement sensor of claim 1, 2 or 3, wherein: the mobile device comprises a sliding rod and a sliding sleeve, wherein the first end of the sliding rod is connected with the first end of the shell and is coaxial with the shell, the sliding sleeve is sleeved outside the sliding rod through a through hole, the sliding rod can freely slide in the axial direction, and the second permanent magnet is installed on the sliding sleeve.
6. The force and linear displacement sensor of claim 5, wherein: the sliding sleeve is an annular hollow sleeve, the second permanent magnet is an annular permanent magnet, and the second permanent magnet is installed in the sliding sleeve.
7. The force and linear displacement sensor of claim 5, wherein: and a stop block for stopping the sliding sleeve is arranged at the second end of the sliding rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020591044.7U CN211904493U (en) | 2020-04-20 | 2020-04-20 | Force and linear displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020591044.7U CN211904493U (en) | 2020-04-20 | 2020-04-20 | Force and linear displacement sensor |
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| Publication Number | Publication Date |
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| CN211904493U true CN211904493U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020591044.7U Active CN211904493U (en) | 2020-04-20 | 2020-04-20 | Force and linear displacement sensor |
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| CN (1) | CN211904493U (en) |
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2020
- 2020-04-20 CN CN202020591044.7U patent/CN211904493U/en active Active
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