CN111397773B - Flexible fingertip contact sensor and preparation method thereof - Google Patents
Flexible fingertip contact sensor and preparation method thereof Download PDFInfo
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- CN111397773B CN111397773B CN201911303848.0A CN201911303848A CN111397773B CN 111397773 B CN111397773 B CN 111397773B CN 201911303848 A CN201911303848 A CN 201911303848A CN 111397773 B CN111397773 B CN 111397773B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
Abstract
A flexible fingertip contact sensor and a preparation method thereof aim to solve the technical problems that in the prior art, the fingertip contact sensor cannot detect space acting force and is high in manufacturing cost, so that large-scale commercial application cannot be realized. The invention comprises a Hall sensor for detecting pressure change, wherein the Hall sensor is arranged on a sensor fixing shaft and comprises a first sensor group and a second sensor group, one end of the sensor fixing shaft is provided with a first mounting groove for mounting the first sensor group, the peripheral surface of the sensor fixing shaft is provided with a second mounting groove for mounting the second sensor group, the other end of the sensor fixing shaft is provided with a mounting hole for mounting a manipulator, pins of the first sensor group and the second sensor group are connected through a conducting piece arranged on the sensor fixing shaft, the peripheral surface of the sensor fixing shaft is provided with a protective layer, the protective layer is provided with a rubber magnetic paste, and one side of the protective layer, which is far away from the sensor fixing shaft, is provided with a forming layer.
Description
Technical Field
The invention relates to the technical field of bionic robots or multi-dexterous hands, in particular to a flexible fingertip contact sensor and a preparation method thereof.
Background
During maneuvering and exploration tasks, the manipulator is often required to respond effectively to unknown objects and obstacles. In conventional industrial applications, the control of the end effector by the robot is achieved by embedding data models of the simulated object and environment into the control algorithm, so that the manipulators can only manipulate known objects and work in a structured environment, which means that their reaction to accidents is slow, and if there is no detailed operating environment model, the real-time measurement of the contact force is crucial to whether the robot can perform the task efficiently and safely. The touch perception is an important component of the autonomous smart hand operation of the robot and provides information such as the acting force and the surface characteristic of the contact point of the manipulator and an object. Although pressure sensors are of various types and are commercialized, ordinary pressure sensors often extract force information of only a single point and cannot help a robot to sense the environment. In recent years, for the problem, many scholars propose an array type architecture, that is, a plurality of pressure sensors are adopted for array arrangement, so that information extraction of multipoint acting force can be realized, and then the position and the acting force magnitude of a stress point are obtained, which lays a foundation for human-like touch. However, it should be noted that in the operation process of the manipulator, fingertips are often subjected to space acting force rather than plane acting force, and although various flexible tactile sensors are designed by domestic and foreign researchers, most of them are in the experimental research stage, and there are not many flexible tactile sensors produced, and there are fewer flexible tactile sensors widely used in robots. Currently, high-end fingertip sensors are widely used by many manufacturers who develop high-dexterity manipulators, but the fingertip sensors account for a large part of the cost of the manipulator.
Chinese patent application No. CN201811301176.5 discloses a finger wearable flexible force tactile feedback device, which comprises a fingertip finger sleeve worn on the distal phalanx of a finger, a middle phalanx finger sleeve worn on the middle phalanx of the finger, a proximal phalanx finger sleeve worn on the proximal phalanx of the finger, an outer transmission rod with bending elasticity arranged on the back of the finger, and an inner transmission rod with bending elasticity arranged on the belly of the finger; one end of the outer transmission rod is fixed on the fingertip finger sleeve and sequentially penetrates through the finger back sides of the middle-section finger sleeve and the proximal-section finger sleeve, and the other end of the outer transmission rod is positioned on the hand back and is connected with an outer driver which applies push-pull force to the outer transmission rod; one end of the inner transmission rod is fixed on the fingertip finger sleeve and sequentially penetrates through the finger pulp sides of the middle-section finger sleeve and the proximal-section finger sleeve, and the other end of the inner transmission rod is positioned on the palm and connected with an inner driver which applies push-pull force to the inner transmission rod; the fingertip fingerstall is provided with a first contact type pressure sensor connected with the end part of the outer transmission rod, the fingertip fingerstall is provided with a second contact type pressure sensor connected with the end part of the inner transmission rod, and the inner wall of the contact part of the fingertip fingerstall and the finger belly is provided with a thin film type pressure sensor. The feedback device is light in structure and convenient to wear, the fingers can flexibly move and interact naturally, and force and touch feedback information is provided for the fingers; however, the device has a complex structure and occupies a large space, and is not suitable for the anthropomorphic development direction of the bionic robot.
Chinese patent application No. CN201710382607.4 discloses a multi-array fingertip tactile interaction device, which is connected with a robot through a serial line, and includes a capacitive multi-array sensor arranged on a flexible circuit board, a main control board provided with an I2C communication interface, and a data sampling chip provided with a digital-analog interface and an I2C communication interface; the capacitive multi-array sensor comprises an upper sensing polar plate, a lower sensing polar plate and a plurality of flexible micro-needles fixed between the upper sensing polar plate and the lower sensing polar plate, wherein the upper sensing polar plate and the lower sensing polar plate are bonded through chemical bonds of filled plasma; the upper and lower sensing electrode plates of the capacitive multi-array sensor are directly connected with a digital-analog interface of a data sampling chip, and the data sampling chip is connected with a main control board through an I2C communication interface.
The sensor adopted in the patent is a capacitive sensor, more touch sensing points can be formed in a smaller area, the size is smaller, the wiring is simple, and the measurement is stable; however, the interaction device cannot detect the space force and is high in manufacturing cost, so that the interaction device is not suitable for large-scale commercial application.
Disclosure of Invention
The invention provides a flexible fingertip contact sensor and a preparation method thereof, aiming at overcoming the technical problems that the fingertip contact sensor in the prior art cannot detect space acting force and has higher manufacturing cost, so that large-scale commercial application cannot be realized.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a flexible fingertip contact sensor, including the hall sensor who is used for detecting pressure variation, hall sensor lays on the sensor fixed axle, hall sensor includes first sensor group and second sensor group, the one end of sensor fixed axle is equipped with the first mounting groove that is used for installing first sensor group, be equipped with the second mounting groove that is used for installing the second sensor group on the global of sensor fixed axle, the other end of sensor fixed axle is equipped with the mounting hole that is used for installing the manipulator, the pin of first sensor group and second sensor group links to each other through arranging the conduction piece on the sensor fixed axle, be equipped with the inoxidizing coating on the outer peripheral face of sensor fixed axle, hall sensor and conduction piece all are located between sensor fixed axle and the inoxidizing coating, be equipped with rubber magnetic paste on the inoxidizing coating, the one side that the sensor fixed axle was kept away from to the inoxidizing coating is. In the prior art, most of low-cost flexible tactile sensors can only detect the acting force change on a plane, namely can only detect the acting force change in the x direction and the y direction, but cannot detect the acting force change in the z direction, but because the flexible tactile sensors are in a four-dimensional space and interact with a three-dimensional object, the detection of the acting force change in the z direction means the dimension transition of the bionic simulation similarity for the bionic subject; at present, most of flexible touch sensors capable of synchronously detecting acting forces in x, y and z directions in space are high in cost and are not suitable for large-scale commercial application. The invention provides a flexible fingertip contact sensor, wherein a first sensor group is arranged on the end surface of a sensor fixing shaft, a second sensor group is arranged on the circumferential surface of the sensor fixing shaft, a protective layer is sleeved on the circumferential surface of the sensor fixing shaft, the protective layer is made of platinum catalytic silicone rubber, a rubber magnetic paste is arranged on the protective layer, when the surface of the flexible fingertip contact sensor is subjected to pressure, the protective layer is extruded and deformed, the rubber magnetic paste connected with the protective layer synchronously generates displacement change, and a Hall sensor fixed on the sensor fixing shaft does not generate displacement change, so that the displacement change of the rubber magnetic paste can cause the change of the surface magnetic field force of the Hall sensor, further the analog quantity output value of the Hall sensor is changed, further, the second sensor group is used for detecting the acting force in the x and y directions in a space, and the first sensor group is used for detecting the acting force in the z direction in the space, due to the fact that the Hall sensors are arranged in an array framework, the action area of external force can be identified. The flexible fingertip contact sensor realizes the detection of space acting force by the cooperation of the Hall sensor, the rubber magnetic sticker and the protective layer made of platinum catalytic silicone rubber, and the manufacturing cost is lower because the components are common components or materials.
Preferably, the sensor fixed axle includes body and installed part, and body and installed part all are the column, and the diameter of installed part and body coaxial arrangement and installed part is less than the diameter of body, is equipped with the locating hole on the global of installed part, the axial extension of the one end of body and edge installed part is kept away from to the installation hole site, and the inner wall of installation hole personally submits the screw thread form. The sensor fixed shaft comprises a body and an installation part, the body is used for installing the Hall sensor, the installation part is used for being connected with the manipulator, and positioning holes are formed in the circumferential surface of the installation part.
Preferably, the circumferential surface of the body is provided with a first annular groove and a second annular groove which are both intersected with the second mounting groove, the second annular groove is positioned on one side of the first annular groove, which is far away from the first sensor group, and is arranged at intervals with the first annular groove, the conducting piece comprises a first conducting piece and a second conducting piece, the first conducting piece is fixed in the first annular groove, and the second conducting piece is fixed in the second annular groove. The first mounting groove and the second mounting groove are respectively used for mounting a first sensor group and a second sensor group, the sensor comprises a pin, a first annular groove and a second annular groove which are intersected with the second mounting groove are formed in the circumferential surface of the body, the first conduction piece is fixed in the first annular groove, the second conduction piece is fixed in the second annular groove, then the pin is welded with the first conduction piece or the second conduction piece, and finally the lead is connected with the first conduction piece and the second conduction piece; through the design, the conducting wires and the pins do not need to be correspondingly connected one by one, and the assembling and mounting mode of the flexible fingertip contact sensor is effectively simplified.
Preferably, the pins comprise a power pin, a grounding pin and a signal pin, the power pin is connected with the first conduction piece in a welding mode, the grounding pin is connected with the second conduction piece in a welding mode, the signal pin extends towards one end close to the installation piece along the axial direction of the body, and a heat shrink tube used for being insulated and separated from the conduction piece is sleeved on the signal pin. The signal pin is sleeved with a heat shrink tube used for being insulated and separated from the conducting piece, so that the stability of signal transmission is ensured.
Preferably, the conducting wires arranged along the length direction of the sensor fixing shaft are communicated with the first conducting piece and the second conducting piece, the conducting wires comprise a first conducting wire and a second conducting wire, and the first conducting wire and the second conducting wire are symmetrically arranged along the radial direction of the body.
As preferred, first mounting groove and second mounting groove are T type groove, and T type groove includes the horizontal groove and is used for carrying out spacing vertical groove to the pin, and vertical groove arranges along the length direction of sensor fixed axle, and the horizontal groove of first mounting groove is located the body and keeps away from the one end of installed part, and the vertical groove of first mounting groove and the vertical groove of second mounting groove along the length direction dislocation of body arrange. The vertical groove of the first mounting groove and the vertical groove of the second mounting groove are arranged along the length direction of the body in a staggered mode, the first sensor group and the second sensor group are arranged in a staggered mode in the mounting process, and integration of arrangement of the Hall sensors is achieved while the mounting area is saved.
Preferably, Smooth-On EcoFlex 0030 is used as the platinum-catalyzed silicone rubber. The Smooth-On EcoFlex 0030 type platinum-catalyzed silicone rubber is very soft after being cured, has good tensile tearing resistance, good elasticity and elongation, can be stretched by multiple times without tearing, and can rebound to the original size without deformation; the platinum catalytic silicone rubber can ensure that the protective layer and the forming layer can still be reset to the original shape after being deformed for multiple times, and the durability and the service life of the flexible fingertip contact sensor are greatly improved.
Preferably, the number of the hall sensors in the first sensor group and the second sensor group is 4, the rubber magnetic paste comprises a first magnetic paste group and a second magnetic paste group, a first rectangular groove used for packaging the first magnetic paste group is arranged on the end face of the protective layer, a second rectangular groove used for packaging the second magnetic paste group is arranged on the circumferential face of the protective layer, and the first rectangular groove and the second rectangular groove are both communicated along the thickness direction of the protective layer.
A preparation method of the flexible fingertip contact sensor comprises the following steps of:
(1) preparing a sensor fixing shaft, wherein four first mounting grooves are uniformly formed in the end face of the sensor fixing shaft, four second mounting grooves are uniformly formed in the circumferential surface of the sensor fixing shaft along the circumferential direction, first annular grooves and second annular grooves are formed in the circumferential surface of the sensor fixing shaft at intervals along the length direction of the sensor fixing shaft, a first conduction piece and a second conduction piece are sequentially embedded into the first annular groove and the second annular groove, a first sensor group and a second sensor group are respectively and correspondingly arranged in the first mounting groove and the second mounting groove, a power supply pin and the first conduction piece are welded, a grounding pin and the second conduction piece are welded, a heat shrink tube is sleeved on a signal pin, and conducting wires are welded on the first conduction piece, the second conduction piece and the signal pin;
(2) preparing a protective layer mold, wherein the protective layer mold is a hollow cylinder, the protective layer is made of two-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor into the protective layer mold, pouring the platinum catalytic silicone rubber into the protective layer mold, pumping out bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa and keeping for 5 minutes, then placing the protective layer mold containing the platinum catalytic silicone rubber into an oven to be heated for 2 hours at the temperature of 50 ℃, and finally taking out the protective layer mold to be cooled and demolded;
(3) preparing a forming layer mold, wherein the forming layer mold is a hollow cylinder, the top of the forming layer mold is hemispherical, the forming layer mold is made of double-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor with a protective layer into the forming layer mold, pouring the platinum catalytic silicone rubber into the forming layer mold, pumping out air bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa, keeping for 5 minutes, then placing the forming layer mold containing the platinum catalytic silicone rubber into an oven, heating for 2 hours at the temperature of 50 ℃, and finally taking out the forming layer mold, cooling and demolding.
In conclusion, the invention has the following beneficial effects: (1) the sensor can realize the detection of space acting force, has low manufacturing cost and can be suitable for large-scale commercial application; (2) the first sensor group and the second sensor group are arranged in a staggered mode in the installation process, so that the installation area is saved, and the arrangement integration of the Hall sensors is realized; (3) the protective layer and the forming layer can still be reset to the original shape after being deformed for multiple times, and the durability and the service life of the flexible fingertip contact sensor are greatly improved; (4) the flexible silica gel is used for skin affinity, has good consistency with the characteristics of human skin, and can also play an insulating role in a circuit in the sensor; (5) the manufacture is simple, and the measuring range and the sensitivity of the fingertip contact sensor can be adjusted by selecting rubber magnetic pastes with different magnetic forces and adjusting the distance between the rubber magnetic pastes and the surface of the Hall sensor.
Drawings
FIG. 1 is a schematic view of a fixed shaft structure of a sensor according to the present invention.
Fig. 2 is a schematic view of the hall sensor installation of the present invention.
Fig. 3 is a schematic view of a protective layer according to the present invention.
FIG. 4 is a schematic representation of a shaping layer of the present invention.
Fig. 5 is an assembly view of the present invention.
In the figure:
the rubber magnetic paste comprises a rubber magnetic paste 1, a first sensor group 2, a second sensor group 3, a first mounting groove 4, a second mounting groove 5, a conducting piece 6, a protective layer 7, a forming layer 8, a body 9, a mounting piece 10, a positioning hole 11, a first annular groove 12, a second annular groove 13, a first conducting piece 14, a second conducting piece 15, a power supply pin 16, a grounding pin 17, a signal pin 18, a heat shrink tube 19, a conducting wire 20, a first rectangular groove 21 and a second rectangular groove 22.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1 to 5, a flexible fingertip contact sensor includes a hall sensor 1 for detecting pressure change, and is characterized in that the hall sensor is disposed on a sensor fixing shaft, the hall sensor includes a first sensor group 2 and a second sensor group 3, one end of the sensor fixing shaft is provided with a first mounting groove 4 for mounting the first sensor group, a second mounting groove 5 for mounting the second sensor group is disposed on the circumferential surface of the sensor fixing shaft, the other end of the sensor fixing shaft is provided with a mounting hole for mounting a manipulator, pins of the first sensor group and the second sensor group are connected by a conduction member 6 disposed on the sensor fixing shaft, a protective layer 7 is disposed on the circumferential surface of the sensor fixing shaft, the hall sensor and the conduction member are both located between the sensor fixing shaft and the protective layer, and a rubber magnetic sticker 1 is disposed on the protective layer, a forming layer 8 is arranged on one side of the protective layer, which is far away from the sensor fixing shaft; the sensor fixing shaft comprises a body 9 and an installation part 10, the body and the installation part are both columnar, the installation part and the body are coaxially arranged, the diameter of the installation part is smaller than that of the body, positioning holes 11 are formed in the peripheral surface of the installation part, the installation holes are located at one end, far away from the body, of the installation part and extend in the axial direction of the installation part, and the inner wall of each installation hole is threaded; the circumferential surface of the body is provided with a first annular groove 12 and a second annular groove 13 which are intersected with the second mounting groove, the second annular groove is positioned on one side of the first annular groove, which is far away from the first sensor group, and is arranged at intervals with the first annular groove, the conducting piece comprises a first conducting piece 14 and a second conducting piece 15, the first conducting piece is fixed in the first annular groove, and the second conducting piece is fixed in the second annular groove; the pins comprise a power supply pin 16, a grounding pin 17 and a signal pin 18, the power supply pin is connected with the first conducting piece in a welding mode, the grounding pin is connected with the second conducting piece in a welding mode, the signal pin extends towards one end close to the mounting piece along the axial direction of the body, and a heat shrinkage pipe 19 used for being insulated and separated from the conducting piece is sleeved on the signal pin; the lead wires 20 arranged along the length direction of the sensor fixing shaft are communicated with the first conducting piece and the second conducting piece, the lead wires comprise a first lead wire and a second lead wire, and the first lead wire and the second lead wire are symmetrically arranged along the radial direction of the body; the first mounting groove and the second mounting groove are both T-shaped grooves, each T-shaped groove comprises a horizontal groove and a vertical groove used for limiting the pins, the vertical grooves are arranged along the length direction of the sensor fixing shaft, the horizontal groove of the first mounting groove is positioned at one end, far away from the mounting piece, of the body, and the vertical grooves of the first mounting groove and the vertical grooves of the second mounting groove are arranged in a staggered mode along the length direction of the body; the protective layer and the forming layer are both made of platinum-catalyzed silicone rubber, and the platinum-catalyzed silicone rubber is Smooth-On EcoFlex 0030; the quantity of hall sensor is 4 in first sensor group and the second sensor group, and the rubber magnetic paste includes first magnetic paste group and second magnetic paste group, is equipped with the first rectangular channel 21 that is used for the first magnetic paste group of encapsulation on the terminal surface of inoxidizing coating, is equipped with the second rectangular channel 22 that is used for the second magnetic paste group of encapsulation on the global of inoxidizing coating, and first rectangular channel and second rectangular channel all link up along the thickness direction of inoxidizing coating.
A preparation method of the flexible fingertip contact sensor comprises the following steps of:
(1) preparing a sensor fixing shaft, wherein four first mounting grooves are uniformly formed in the end face of the sensor fixing shaft, four second mounting grooves are uniformly formed in the circumferential surface of the sensor fixing shaft along the circumferential direction, first annular grooves and second annular grooves are formed in the circumferential surface of the sensor fixing shaft at intervals along the length direction of the sensor fixing shaft, a first conduction piece and a second conduction piece are sequentially embedded into the first annular groove and the second annular groove, a first sensor group and a second sensor group are respectively and correspondingly arranged in the first mounting groove and the second mounting groove, a power supply pin and the first conduction piece are welded, a grounding pin and the second conduction piece are welded, a heat shrink tube is sleeved on a signal pin, and conducting wires are welded on the first conduction piece, the second conduction piece and the signal pin;
(2) preparing a protective layer mold, wherein the protective layer mold is a hollow cylinder, the protective layer is made of two-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor into the protective layer mold, pouring the platinum catalytic silicone rubber into the protective layer mold, pumping out bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa and keeping for 5 minutes, then placing the protective layer mold containing the platinum catalytic silicone rubber into an oven to be heated for 2 hours at the temperature of 50 ℃, and finally taking out the protective layer mold to be cooled and demolded;
(3) preparing a forming layer mold, wherein the forming layer mold is a hollow cylinder, the top of the forming layer mold is hemispherical, the forming layer mold is made of double-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor with a protective layer into the forming layer mold, pouring the platinum catalytic silicone rubber into the forming layer mold, pumping out air bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa, keeping for 5 minutes, then placing the forming layer mold containing the platinum catalytic silicone rubber into an oven, heating for 2 hours at the temperature of 50 ℃, and finally taking out the forming layer mold, cooling and demolding.
As shown in fig. 2, the sensor fixing shaft sequentially comprises a body and an installation part from top left to bottom right, the body and the installation part are both cylindrical, the body and the installation part are coaxially arranged, the diameter of the body is larger than that of the installation part, a first installation groove is arranged on the upper end face of the body and is a T-shaped groove, a horizontal groove of the T-shaped groove is positioned on the upper end face of the body, vertical grooves of the T-shaped groove are positioned on the peripheral face of the body, the number of the first installation grooves is four, the first installation grooves are arranged along the circumferential direction of the body at equal included angles, the included angle between every two adjacent first installation grooves is 90 degrees, a first sensor group is arranged in the first installation grooves, wherein a detection element of a hall sensor is positioned in the horizontal groove, and a pin of the hall sensor extends along the axial direction of the body and is positioned in the vertical groove; the peripheral surface of the body is provided with second mounting grooves, the number of the second mounting grooves is four, the second mounting grooves are arranged along the circumferential direction of the body at equal included angles, the second mounting grooves are T-shaped grooves, the first mounting grooves and the second mounting grooves are arranged along the circumferential direction of the body at intervals, the first mounting grooves and the second mounting grooves are arranged along the axial direction of the body in a staggered manner, first annular grooves and second annular grooves are sequentially arranged below horizontal grooves of the second mounting grooves, the first annular grooves and the second annular grooves are arranged at intervals, first conduction pieces made of copper are arranged in the first annular grooves, second conduction pieces made of copper are arranged in the second annular grooves, power pins of the first sensor group and power pins of the second sensor group are welded with the first conduction pieces, grounding pins of the first sensor group and the second sensor group are welded with the second conduction pieces, and conducting wires are arranged along the length direction of the sensor fixing shaft and are connected with the first conduction pieces and the second conduction pieces; the outer peripheral face of the sensor fixing shaft is sleeved with a protective layer made of platinum catalytic silicone rubber, a first rectangular groove and a second rectangular groove are formed in the positions, corresponding to the horizontal groove of the T-shaped groove, of the protective layer respectively, the first rectangular groove is located on the end face of the protective layer, the second rectangular groove is located on the peripheral face of the protective layer, a first magnetic paste group is packaged in the first rectangular groove, a second magnetic paste group is packaged in the second rectangular groove, and a forming layer made of platinum catalytic silicone rubber is sleeved outside the protective layer.
Claims (7)
1. A flexible fingertip contact sensor comprises a Hall sensor for detecting pressure change, and is characterized in that the Hall sensor is arranged on a sensor fixing shaft and comprises a first sensor group and a second sensor group, one end of the sensor fixing shaft is provided with a first mounting groove for mounting the first sensor group, the peripheral surface of the sensor fixing shaft is provided with a second mounting groove for mounting the second sensor group, the other end of the sensor fixing shaft is provided with a mounting hole for mounting a manipulator, pins of the first sensor group and the second sensor group are connected through a conduction piece arranged on the sensor fixing shaft, the peripheral surface of the sensor fixing shaft is provided with a protective layer, the Hall sensor and the conduction piece are both positioned between the sensor fixing shaft and the protective layer, the protective layer is provided with a rubber magnetic paste, and one side of the protective layer, far away from the sensor fixing shaft, is provided with a forming layer, inoxidizing coating and shaping layer are made by platinum catalysis silicon rubber, and the sensor fixed axle includes body and installed part, and body and installed part all are the column, and the diameter of installed part and body coaxial arrangement and installed part is less than the diameter of body, is equipped with the locating hole on the global of installed part, the one end that the body was kept away from to the installed part position of installation hole just extends along the axial of installed part, and the screw thread form is personally submitted to the inner wall of mounting hole, and the figure of hall sensor is 4 in first sensor group and the second sensor group, and the rubber magnetic paste includes first magnetic paste group and second magnetic paste group, is equipped with the first rectangular channel that is used for encapsulating first magnetic paste group on the terminal surface of inoxidizing coating, is equipped with the second rectangular channel that is used for encapsulating second magnetic paste group on the global of inoxidizing coating, and first rectangular channel and second rectangular channel all link up along the thickness direction of inoxidizing coating.
2. The flexible fingertip contact sensor according to claim 1, wherein a first annular groove and a second annular groove are formed in the circumferential surface of the body, the first annular groove and the second annular groove are both intersected with the second mounting groove, the second annular groove is located on one side, away from the first sensor group, of the first annular groove and is arranged at an interval with the first annular groove, the conducting pieces comprise a first conducting piece and a second conducting piece, the first conducting piece is fixed in the first annular groove, and the second conducting piece is fixed in the second annular groove.
3. The flexible fingertip contact sensor according to claim 2, wherein the pins include a power pin, a ground pin and a signal pin, the power pin is connected to the first conducting member by welding, the ground pin is connected to the second conducting member by welding, the signal pin extends toward an end close to the mounting member along the axial direction of the body, and a heat shrink tube is sleeved on the signal pin for insulating and separating the signal pin from the conducting member.
4. The flexible fingertip contact sensor according to claim 3, wherein a lead arranged along a length direction of the sensor fixing shaft is communicated with the first conducting member and the second conducting member, the lead comprises a first lead and a second lead, and the first lead and the second lead are symmetrically arranged along a radial direction of the body.
5. The flexible fingertip contact sensor according to claim 1, wherein the first mounting groove and the second mounting groove are both T-shaped grooves, each T-shaped groove comprises a horizontal groove and a vertical groove for limiting the pin, the vertical grooves are arranged along the length direction of the sensor fixing shaft, the horizontal groove of the first mounting groove is located at one end of the body, which is far away from the mounting piece, and the vertical grooves of the first mounting groove and the vertical grooves of the second mounting groove are arranged in a staggered manner along the length direction of the body.
6. A flexible fingertip touch sensor according to claim 1, wherein the platinum catalyzed silicone rubber is Smooth-On EcoFlex 0030.
7. A method of manufacturing a flexible fingertip contact sensor according to any one of claims 1 to 6, characterized by comprising the following sequential execution steps:
(1) preparing a sensor fixing shaft, wherein four first mounting grooves are uniformly formed in the end face of the sensor fixing shaft, four second mounting grooves are uniformly formed in the circumferential surface of the sensor fixing shaft along the circumferential direction, first annular grooves and second annular grooves are formed in the circumferential surface of the sensor fixing shaft at intervals along the length direction of the sensor fixing shaft, a first conduction piece and a second conduction piece are sequentially embedded into the first annular groove and the second annular groove, a first sensor group and a second sensor group are respectively and correspondingly arranged in the first mounting groove and the second mounting groove, a power supply pin and the first conduction piece are welded, a grounding pin and the second conduction piece are welded, a heat shrink tube is sleeved on a signal pin, and conducting wires are welded on the first conduction piece, the second conduction piece and the signal pin;
(2) preparing a protective layer mold, wherein the protective layer mold is a hollow cylinder, the protective layer is made of two-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor into the protective layer mold, pouring the platinum catalytic silicone rubber into the protective layer mold, pumping out bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa and keeping for 5 minutes, then placing the protective layer mold containing the platinum catalytic silicone rubber into an oven to be heated for 2 hours at the temperature of 50 ℃, and finally taking out the protective layer mold to be cooled and demolded;
(3) preparing a forming layer mold, wherein the forming layer mold is a hollow cylinder, the top of the forming layer mold is hemispherical, the forming layer mold is made of double-component room temperature curing platinum catalytic silicone rubber which is prepared according to the proportion of 1:1, placing a flexible fingertip contact sensor with a protective layer into the forming layer mold, pouring the platinum catalytic silicone rubber into the forming layer mold, pumping out air bubbles in the platinum catalytic silicone rubber under the negative pressure of 0.1MPa, keeping for 5 minutes, then placing the forming layer mold containing the platinum catalytic silicone rubber into an oven, heating for 2 hours at the temperature of 50 ℃, and finally taking out the forming layer mold, cooling and demolding.
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| CN112577651B (en) * | 2020-11-02 | 2023-05-16 | 中南大学 | Finger sensor of mechanical hand sensor |
| CN112720558A (en) * | 2020-12-25 | 2021-04-30 | 浙江工业大学 | Flexible finger-tip robot hand directly driven by motor |
| CN113183174B (en) * | 2021-05-25 | 2022-10-11 | 北方工业大学 | Soft robot gripper based on magnetic ball reinforced elastomer |
| CN113218559B (en) * | 2021-05-28 | 2022-07-15 | 浙江工业大学 | Flexible three-dimensional force sensor and preparation method thereof |
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