CN117906820A - Shaft pin type three-way force transducer - Google Patents

Abstract

The invention relates to the technical field of force sensors, in particular to a shaft pin type three-way force sensor, which comprises a base; the first shell is of a cylindrical structure, the first shell and the second shell are arranged in a staggered manner along the axis of the first shell, the first shell and the second shell which are adjacent along the axis direction of the first shell are in sliding fit, a plurality of first steel strings are arranged on the connected end parts of the first shell and the second shell in a straddling manner, the first steel strings are arranged in the first shell around the axis of the first shell, and two ends of each first steel string are connected with the first shell and the second shell which are straddled by the first steel strings respectively; the monitoring device is arranged on one side of the first steel wire, the base can output alternating current to the first steel wire, the first steel wire vibrates after being electrified, and the monitoring device monitors the vibration frequency of the first steel wire. The invention overcomes the situation that the traditional sensor cannot detect slight stress change.

Description

Shaft pin type three-way force transducer

Technical Field

The invention relates to the technical field of force sensors, in particular to a shaft pin type three-way force sensor.

Background

The shaft pin type force sensor is widely applied to the fields of mechanical products, test detection and the like and is mainly used for overload control or load research. At present, the common shaft pin type force sensor at home and abroad mainly has two design principles: shear stress and bending normal stress. The Chinese part patents (such as CN00212676.1 and the like), the British part patents (such as GB819377A and the like), the Japanese part patents (such as JP2009198274, JP2010159548, JP2010281783 and the like) and the like are shear type shaft pin force sensors, and the bearing shearing force of the pin shaft is measured by utilizing the principle of shear stress, so that the influence of poor repeatability of the bearing point position of the pin shaft on the test sensitivity can be eliminated, but only the radial force of the pin shaft can be measured. Chinese part patents (such as CN201210554820.6, etc.), korean part patents (such as KR20110045517, etc.), etc. are curved pin force sensors, and the bearing capacity of the pin is measured by using the principle of normal bending stress, and different parts of the same type may cause poor repeatability of bearing points, thus causing larger test sensitivity errors, and only measuring the radial force of the pin. Some mechanical products now need to detect the three-way force (i.e. the two component forces in the radial direction and the axial force) of the pin, and need to realize axial prestress assembly, and the existing pin force sensor cannot meet the requirements.

Chinese patent CN105588669B discloses a three-way force transducer with axle pin, which comprises an axle pin elastic element, at least 20 strain gauge groups composed of single axle strain gauge and an auxiliary circuit of strain gauge bridge, wherein the strain gauge groups are 5 groups, the axle pin elastic element is provided with an axle pin elastic groove i and an axle pin elastic groove ii, each group of strain gauge is installed on the circumferential outer surface or inner hole surface of the axle pin elastic groove i and the axle pin elastic groove ii with the same radius of the same axial cross section.

The above-mentioned scheme is though can detect two component forces of radial direction and axial force, but all rely on the foil gage to detect when detecting, and the sensor wholly takes place to deform when receiving external force promptly, and then make the foil gage that sets up on the sensor take place to deform, but need use many foil gage in the above-mentioned scheme, and when outside slightly deforms, the foil gage all sets up in the inside of sensor cover shell, sensor cover shell self has certain deformation resistance, the foil gage can't accomplish accurate monitoring, after long-time use, certain irreversible deformation can appear in the foil gage, just can influence the result of detection when detecting through the foil gage after taking place deformation like this.

Disclosure of Invention

According to the axial pin type three-way force transducer, the sensor is arranged inside the to-be-measured piece, when the to-be-measured piece is deformed under the action of force, the first shell and the second shell slide relatively, the first steel wire arranged between the first shell and the second shell is tensioned or relaxed, the frequency of the tensioned or relaxed first steel wire is monitored through the monitoring device, so that the strain situation of the to-be-measured piece after being subjected to the force can be calculated, the two component forces and the axial force in the radial direction between the first shell and the second shell are calculated, namely, the first shell and the second shell can be driven to slide as long as the to-be-measured piece is slightly deformed under the action of force, the frequency of the first steel wire is changed, and the situation that the conventional sensor cannot detect slight force change is overcome.

In order to solve the problems in the prior art, the invention provides a shaft pin type three-way force transducer, which comprises a base; the sensor further comprises a first shell, a second shell, a first steel string and a monitoring device; the first shell is in a cylindrical structure, the first shell and the second shell are staggered along the axis of the first shell, the first shell and the second shell which are adjacent along the axis direction of the first shell are in sliding fit, the staggered first shell and second shell form the external shape of the sensor, and the integral structure formed by the first shell and the second shell is fixedly arranged on the base; the first steel strings are arranged in the first shell around the axis of the first shell, the two ends of the first steel strings are respectively connected with the first shell and the second shell which are spanned by the first steel strings, and when the first shell and the second shell slide relatively along the axis of the first shell, the first steel strings are tensioned or relaxed; the monitoring device is arranged on one side of the first steel wire, the base can output alternating current to the first steel wire, the first steel wire vibrates after being electrified, and the monitoring device monitors the vibration frequency of the first steel wire.

Preferably, the sensor further comprises strain detecting means, the number of the strain detecting means is the same as the sum of the number of the first shell and the second shell, and one strain detecting means is arranged in each of the first shell and the second shell and used for detecting the strain value of the first shell and the second shell.

Preferably, the monitoring device comprises a frequency identification device and a fixing device; two ends of the fixing device are respectively arranged on the adjacent first shell and second shell, and the first steel string is arranged on the fixing device along the axis of the first shell; the frequency identification device is arranged at the end part of the fixing device and is used for identifying the frequency of the first steel string positioned between the two ends of the fixing device.

Preferably, the monitoring device further comprises a zeroing device, wherein the zeroing device is arranged at the end part of the first steel string and provides constant tension for the first steel string.

Preferably, the fixing device comprises a fixing assembly and a clamping device; the fixing component is alternatively arranged on the adjacent first shell or second shell, and fixedly connects one end of the first steel string; the clamping device is arranged on the first shell or the second shell which is not provided with the fixing component, and the clamping device clamps the first steel string.

Preferably, the zeroing device comprises a zeroing steel string, a supporting frame and a weight; the two support frames are respectively and fixedly arranged at two ends of the fixing device and are respectively positioned in the first shell and the second shell; one end of the zeroing steel wire is fixedly connected with one end of the first steel wire, which is far away from the fixing component, and one end of the zeroing steel wire, which is far away from the first steel wire, sequentially penetrates through the support frame in the first shell and the support frame in the second shell along the axis of the first shell; the weight is fixedly arranged at the end part of the zeroing steel string, which is far away from the first steel string.

Preferably, the sensor further comprises an anti-falling device, wherein the anti-falling device comprises a first limiting ring and a second limiting ring; the two first limiting rings are fixedly arranged at two ends of the first shell along the axis of the first shell respectively, and protrude to the outside of the first shell along the radial direction of the first shell; the second spacing ring is provided with two, and two second spacing rings set up respectively at the both ends of second shell along the axis of first shell, and when first shell and second shell relatively slid, first spacing ring and second spacing ring were close to each other or keep away from, and the external diameter of first spacing ring is greater than the internal diameter of second spacing ring.

Preferably, the sensor further comprises a position correction device comprising a correction block and a drive device; the correcting groove is formed in the first limiting ring in a penetrating manner along the radial direction of the first shell, the correcting block is arranged in the correcting groove in a sliding manner along the extending direction of the correcting groove, the middle of the upper end of the correcting block is provided with a groove, and both sides of the upper part of the groove are provided with inclined grooves; the driving device is arranged at the side part of the second limiting ring, the driving device drives the correction block to slide out of the correction groove, and the correction block is clamped and connected with the second limiting ring through the groove.

Preferably, the sensor further comprises an unlocking device, the unlocking device is arranged in the correction groove, and the unlocking device drives the correction block to slide into the correction groove against the driving force of the driving device after being electrified.

Preferably, the correction block has a cavity structure.

Compared with the prior art, the invention has the beneficial effects that:

According to the invention, the sensor is arranged in the to-be-detected piece through the first shell, the second shell, the first steel wire and the monitoring device, when the to-be-detected piece is deformed under the action of force, the first shell and the second shell slide relatively, the first steel wire arranged between the first shell and the second shell is tensioned or relaxed, the frequency of the tensioned or relaxed first steel wire is monitored through the monitoring device, so that the strain condition of the to-be-detected piece after being subjected to the action of force can be calculated, the two component forces and the axial force in the radial direction between the first shell and the second shell are calculated, namely, the first shell and the second shell can be driven to slide as long as the to-be-detected piece is subjected to the action of slight deformation, and the frequency of the first steel wire is changed, so that the condition that the conventional sensor cannot detect the slight force change is overcome.

Drawings

Fig. 1 is a perspective view of a three-way load cell of the pin type.

FIG. 2 is a side view of a three-way load cell with a base removed.

FIG. 3 is a schematic cross-sectional view of the axial pin three-way load cell of FIG. 2 at A-A.

Fig. 4 is an enlarged partial schematic view of the three-way load cell of fig. 3B of an axial pin type.

FIG. 5 is a cutaway perspective view of a three-way load cell with the base removed.

Fig. 6 is an enlarged partial schematic view of the three-way load cell of fig. 5C with an axial pin.

Fig. 7 is an enlarged partial schematic view of the three-way load cell of fig. 5D with an axial pin.

Fig. 8 is an enlarged partial schematic view of the three-way load cell of fig. 5, shown at E.

FIG. 9 is a schematic perspective view of a three-way load cell with a base and a portion of a second housing removed.

Fig. 10 is an enlarged partial schematic view of the axial three-way load cell of fig. 9 at F.

The reference numerals in the figures are:

1. A first housing; 2. a second housing; 3. a first steel string; 4. a monitoring device; 41. a frequency identification device; 411. a miniature microphone; 42. a fixing device; 421. a fixing assembly; 4211. a first fixing plate; 4212. a fixed block; 422. a clamping device; 4221. a second fixing plate; 4222. a clamping groove; 4223. a clamping block; 4224. a first electromagnet; 43. zero setting device; 431. zeroing the steel string; 432. a support frame; 433. a weight; 5. strain detecting means; 51. a second steel string; 52. a strain gage; 6. an anti-falling device; 61. a first stop collar; 62. a second limiting ring; 7. a position correction device; 71. a correction block; 711. a groove; 712. an inclined groove; 72. a driving device; 721. a first magnet; 722. a second magnet; 73. correcting the groove; 8. unlocking means; 9. a base.

Detailed Description

The invention will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the invention and the specific objects and functions achieved.

Referring to fig. 1 and 2: the shaft pin type three-way force transducer comprises a base 9; the sensor also comprises a first shell 1, a second shell 2, a first steel string 3 and a monitoring device 4; the first shell 1 is in a cylindrical structure, the first shell 1 and the second shell 2 are staggered along the axis of the first shell 1, the first shell 1 and the second shell 2 which are adjacent along the axis direction of the first shell 1 are in sliding fit, the staggered first shell 1 and second shell 2 form the external shape of the sensor, and the integral structure formed by the first shell 1 and the second shell 2 is fixedly arranged on the base 9; the first steel strings 3 are arranged on the connected end parts of the first shell 1 and the second shell 2 in a straddling mode, the plurality of first steel strings 3 are arranged in the first shell 1 around the first shell 1, the first steel strings 3 are arranged in the first shell 1 around the axis of the first shell 1, two ends of each first steel string 3 are respectively connected with the first shell 1 and the second shell 2 on which the first steel strings 3 are arranged in a straddling mode, and when the first shell 1 and the second shell 2 slide relatively along the axis of the first shell 1, the first steel strings 3 are tensioned or relaxed; the monitoring device 4 is arranged on one side of the first steel string 3, the base 9 can output alternating current to the first steel string 3, the first steel string 3 vibrates after being electrified, and the monitoring device 4 monitors the vibration frequency of the first steel string 3.

The base 9 is internally provided with a processor to set the sensor on a piece to be detected, at this time, the first shell 1 and the second shell 2 need to be fully inserted into the piece to be detected, the outer side of the first shell 1 and the outer side of the second shell 2 are in close contact with the piece to be detected, when the piece to be detected is stressed, the adjacent first shell 1 and the second shell 2 slide relatively, in order to facilitate understanding, the sensor formed by the first shell 1 and the two second shells 2 is used for describing, the two second shells 2 are respectively arranged at two ends of the first shell 1 along the axis of the first shell 1, the two ends of the first shell 1 are in sliding fit with the two second shells 2 at two ends of the first shell 1, when the first shell 1 and the second shell 2 slide relatively, the first steel wire 3 straddling between the first shell 1 and the second shell 2 deforms synchronously, that is, the first steel wire 3 will be tensioned or relaxed, as known from the existing formula, the tension of the first steel wire 3 is in a proportional relationship with the square of the frequency, the tension of the first steel wire 3 is also in a proportional relationship with the strain value of the first steel wire 3, and under the condition that the length of the first steel wire 3 is constant, the tension or relaxation of the first steel wire 3 occurs, and the tension or relaxation of the first steel wire 3 necessarily indicates that the first steel wire 3 is displaced, the displacement of the first steel wire 3 is in a proportional relationship with the strain value of the first steel wire 3, so that the displacement of the first steel wire 3 is obtained through measuring and calculating the strain of the first steel wire 3, and a plurality of first steel wires 3 are arranged in the first housing 1, and a mathematical model can be built through measuring and calculating the displacement of all the first steel wires 3 in the first housing 1, the mathematical model after the establishment can express the actual deformation condition between first shell 1 and second shell 2, so just can calculate the two component forces and the axial force of radial direction between first shell 1 and second shell 2, divide into the multistage concatenation with the sensor whole through first shell 1 and second shell 2 and constitute, when taking place the atress, adjacent first shell 1 and second shell 2 because the relative sliding fit takes place during the time, so relatively sliding takes place between first shell 1 and the second shell 2 more easily, stride and establish the first steel string 3 between first shell 1 and second shell 2 also more easily by driving stretching or relaxation, it is worth noting that, in the outside of first shell 1 and second shell 2 all overlaps and is equipped with the antiskid cover, when first shell 1 and second shell 2 set up in waiting to detect the piece, wait to detect the back of piece atress, the condition that just be difficult for appearing between first shell 1 and the second shell 2 and the piece that waits to detect, stability when traditional sensor passes through foil gauge 52 and detects, when the atress after the piece has the piece that the sensor has certain sensor's own shell that takes place the first steel string 3 is driven to stretch or loosen, it is difficult to change to take place, the second shell 1 is difficult to take place to change in the circumstances, and the deformation condition is then can't be overcome to take place to the second shell 1 to take place to the moment, the sensor is slightly after the sensor has the atress to take place, the second shell is difficult to take place, the appearance change.

Referring to fig. 3 and 5: the sensor further comprises strain detection devices 5, the number of the strain detection devices 5 is the same as the sum of the number of the first shell 1 and the second shell 2, one strain detection device 5 is arranged in each of the first shell 1 and the second shell 2, and the strain detection devices 5 are used for detecting the strain values of the first shell 1 and the second shell 2.

The present invention provides a first embodiment of a strain gauge 5, the strain gauge 5 comprising a plurality of sets of strain gauges 52, the sets of strain gauges 52 being provided with a number equal to the sum of the number of first and second housings 1, 2. Taking the first housing 1 as an example, a set of strain gauges 52 is provided inside the first housing 1, a set of strain gauges 52 comprises a plurality of strain gauges 52, the plurality of strain gauges 52 are uniformly provided on the inner wall of the first housing 1 around the axis of the first housing 1, when the first housing 1 is subjected to an external pressure, the first housing 1 is slightly deformed, so that the strain gauges 52 provided on the first housing 1 are slightly deformed, so that the strain gauges 52 monitor the stress of the first housing 1, a second embodiment of the strain gauge 5, the strain gauge 5 comprises a second steel string 51, taking the first shell 1 as an example, the second steel strings 51 are arranged in the first shell 1 along the axis of the first shell 1, a plurality of second steel strings 51 are uniformly distributed in the first shell 1 around the axis of the first shell 1, two ends of each second steel string 51 are respectively connected with two ends of the first shell 1 in the axis direction of the first shell 1, when the first shell 1 is deformed, the second steel strings 51 are stretched or relaxed, the frequency of each second steel string 51 is changed, the detection principle of each second steel string 51 is the same as that of the first steel string 3, the tension of each second steel string 51 is in a proportional relation with the square of the frequency according to a formula, the tension of each second steel string 51 is also in a proportional relation with the strain value of each second steel string 51, and under the condition that the length of each second steel string 51 is constant, the second steel string 51 is stretched or relaxed under stress, the stretching or loosening of the second steel string 51 necessarily illustrates that the second steel string 51 is displaced, and the variable displacement of the second steel string 51 is in a proportional relation with the strain value of the second steel string 51, so that the displacement of the second steel string 51 is obtained through measuring and calculating the strain value of the second steel string 51, a plurality of second steel strings 51 are arranged in the first shell 1, a mathematical model can be built through measuring and calculating the displacement values of all the second steel strings 51 in the first shell 1, and the built mathematical model can express the actual deformation condition of the first shell 1, so that the two component forces and the axial force in the radial direction in the first shell 1 can be calculated.

Referring to fig. 2, 7 and 10: the monitoring means 4 comprise frequency identification means 41 and fixing means 42; two ends of the fixing device 42 are respectively arranged on the adjacent first shell 1 and second shell 2, and the first steel wire 3 is arranged on the fixing device 42 along the axis of the first shell 1; the frequency identification means 41 are arranged at the ends of the fixing means 42, the frequency identification means 41 identifying the frequency of the first string 3 located between the two ends of the fixing means 42.

Since both ends of the fixing device 42 are respectively disposed on the adjacent first casing 1 and second casing 2, a certain distance exists between the end of the same fixing device 42 disposed on the first casing 1 and the end disposed on the second casing 2, the first steel string 3 is respectively fixed by both ends of the fixing device 42, the frequency recognition device 41 performs frequency recognition on the first steel string 3 portion located between both ends of the fixing device 42, which is due to the fact that the length is constant, and the frequency is affected by the length of the material, so that the frequency recognition device 41 is more accurate when recognizing the frequency of the first steel string 3 by ensuring the length of the first steel string 3, the frequency recognition device 41 is preferably a miniature microphone 411, when the base 9 outputs alternating current to the first steel string 3, the first steel string 3 vibrates, so that the first steel string 3 in vibration emits sound, and the frequency of vibration can be recognized by collecting the sound by the frequency recognition device 41.

Referring to fig. 2 and 3: the monitoring device 4 further comprises a zeroing device 43, which zeroing device 43 is arranged at the end of the first steel string 3, the zeroing device 43 providing a constant pulling force for the first steel string 3.

The zeroing device 43 needs to correct all the first strings 3 in the sensor before the sensor works, that is, one end of the fixing device 42 for fixing the first strings 3 is loosened, the zeroing device 43 is also positioned at the loosened end of the fixing device 42, then the zeroing device 43 tightens the first strings 3, so that each first string 3 is in a tight state, then one end of the loosened fixing device 42 is closed again, and then normal detection can be performed, because after detection is completed, part of the first strings 3 are tightly tightened, and part of the first strings 3 are in a loose state, so that a non-zeroing situation occurs, and errors are necessarily caused if the non-zeroing sensor is used for secondary detection.

Referring to fig. 5-7: the fixture 42 includes a fixture assembly 421 and a clamping device 422; the fixing component 421 is alternatively arranged on the adjacent first shell 1 or second shell 2, and the fixing component 421 fixedly connects one end of the first steel string 3; the clamping device 422 is arranged on the first casing 1 or the second casing 2 without the fixing assembly 421, and the clamping device 422 clamps the first steel string 3.

The second housing 2 has a cylindrical structure, and the first housing 1 and the two second housings 2 together form a sensor whole, the second housing 2, the first housing 1 and the second housing 2 are sequentially arranged from the base 9 along the length direction of the sensor, a fixing component 421 is arranged in the second housing 2 close to the base 9, a clamping device 422 and a fixing component 421 are sequentially arranged in the first housing 1 adjacent to the second housing 2 close to the base 9, a clamping device 422 is arranged on the second housing 2 arranged at one end of the first housing 1 far from the base 9, for convenience of understanding, the fixing component 421 is arranged on the first housing 1, the corresponding clamping device 422 is arranged on the second housing 2, the fixing component 421 comprises a first fixing plate 4211 and a fixing block 4212, the first fixing plate 4211 is fixedly arranged on the inner wall of the first housing 1 along the radial direction of the first housing 1, the fixing block 4212 is fixedly arranged on the first fixing plate 4211, one end of the first steel wire 3 is fixedly connected with the fixing block 4212, the clamping device 422 comprises a second fixing plate 4221, a clamping groove 4222, a clamping block 4223 and a first electromagnet 4224, the second fixing plate 4221 is fixedly arranged on the inner wall of the second housing 2 along the radial direction of the second housing 2, the clamping groove 4222 is arranged on the second fixing plate 4221 in a penetrating way along the axis of the second housing 2, the clamping block 4223 is arranged on the lower part of the clamping groove 4222 in a penetrating way along the length direction of the second fixing plate 4221, the clamping block 4223 is in sliding fit with the clamping groove 4222, the first electromagnet 4224 is arranged on one side of the clamping groove 4222 away from the axis of the second housing 2, which is called as the upper part of the clamping groove 4222, the lower part of the corresponding clamping groove 4222 is one side of the clamping groove 4222 close to the axis of the second housing 2, there is a gap between the first electromagnet 4224 and the clamping block 4223, the first steel string 3 passes through the gap, the end of the first steel string 3 far away from the fixing component 421 is fixedly connected with the end of the zeroing steel string 431, when the first electromagnet 4224 is not electrified, the clamping block 4223 has no clamping force on the first steel string 3, the zeroing device 43 can zeroe the first steel string 3, and when the first electromagnet 4224 is electrified, the clamping block 4223 clamps the first steel string 3, so that the length of the first steel string 3 is not changed any more.

Referring to fig. 3 and 5: the zeroing device 43 comprises a zeroing steel string 431, a supporting frame 432 and a weight 433; the two supporting frames 432 are arranged, the two supporting frames 432 are respectively and fixedly arranged at two ends of the fixing device 42, and the two supporting frames 432 are respectively positioned in the first shell 1 and the second shell 2; one end of the zeroing steel string 431 is fixedly connected with one end of the first steel string 3 far away from the fixing component 421, and one end of the zeroing steel string 431 far away from the first steel string 3 sequentially penetrates through a supporting frame 432 in the first shell 1 and a supporting frame 432 in the second shell 2 along the axis of the first shell 1; the weight 433 is fixedly disposed at the end of the zeroing string 431 remote from the first string 3.

The weight 433 produces pulling force to the first steel string 3 through the zeroing steel string 431 under the action of gravity, when the clamping device 422 releases the clamping, the first steel string 3 in a tight state can be restored, and the first steel string 3 in a loose state can be tensioned again under the action of the weight 433, the zeroing is required because the length of the first steel string 3 which is tightly tensioned for a long time is unchanged, but the metal fatigue of the first steel string 3 which is tightly tensioned can occur, the detection result is affected, and the first steel string 3 in a loose state can possibly occur due to the slipping condition at the clamping device 422, so that the length of the first steel string 3 is changed, and the detection result is also affected.

Referring to fig. 3 and 4: the sensor also comprises an anti-falling device 6, wherein the anti-falling device 6 comprises a first limiting ring 61 and a second limiting ring 62; the two first limiting rings 61 are arranged, the two first limiting rings 61 are fixedly arranged at two ends of the first housing 1 along the axis of the first housing 1 respectively, and the first limiting rings 61 protrude to the outside of the first housing 1 along the radial direction of the first housing 1; the two second limiting rings 62 are arranged, the two second limiting rings 62 are respectively arranged at two ends of the second housing 2 along the axis of the first housing 1, when the first housing 1 and the second housing 2 slide relatively, the first limiting ring 61 and the second limiting ring 62 are close to or far away from each other, and the outer diameter of the first limiting ring 61 is larger than the inner diameter of the second limiting ring 62.

By providing the first and second stopper rings 61 and 62, the first and second housings 1 and 2 are prevented from slipping when they slide relatively.

Referring to fig. 3 and 4: the sensor further comprises a position correction device 7, the position correction device 7 comprising a correction block 71 and a driving device 72; the correction groove 73 is formed in the first limiting ring 61 in a penetrating manner along the radial direction of the first shell 1, the correction block 71 is arranged in the correction groove 73 in a sliding manner along the extending direction of the correction groove 73, a groove 711 is formed in the middle of the upper end of the correction block 71, and inclined grooves 712 are formed in two sides of the upper portion of the groove 711; the driving device 72 is disposed at the side of the second limiting ring 62, the driving device 72 drives the correction block 71 to slide out from the correction groove 73, and the correction block 71 is clamped to the second limiting ring 62 through the groove 711.

The driving device 72 is used for driving the correction block 71 to slide along the radial direction of the first housing 1 towards the position far away from the axis of the first housing 1, that is, the driving device 72 drives the correction block 71 to slide out of the correction groove 73, when the sensor is not in use, the correction block 71 is attracted to the correction groove 73 due to the fact that the first housing 1 and the second housing 2 slide relatively under the action of no external force limitation, so that damage to the first steel wire 3 can occur, in order to avoid the situation, the position correction device 7 is arranged, the driving device 72 comprises a first magnet 721 and a second magnet 722, the first magnet 721 and the second magnet 722 are of annular structures, the first magnet 721 and the second magnet 722 are respectively arranged on two sides of the second limiting ring 62, when the sensor is not in use, the first magnet 721 and the second magnet 722 are attracted to the correction block 71 below the correction block, the correction block 71 is attracted to the correction groove 73 under the attraction of the first magnet 721 and the second magnet 722, and the inclined grooves 712 arranged on two sides of the groove 711 can guide the second limiting ring 62 to slide into the groove 711 smoothly, so that the first housing 1 and the second housing 2 are dead.

Referring to fig. 4: the sensor further comprises an unlocking device 8, wherein the unlocking device 8 is arranged in the correction groove 73, and the unlocking device 8 drives the correction block 71 to slide into the correction groove 73 against the driving force of the driving device 72 after being electrified.

The unlocking device 8 comprises a second electromagnet, when the sensor needs to be used, the second electromagnet is electrified, the second electromagnet generates attractive force to the correction block 71, so that the correction block 71 overcomes the attractive force of the first magnet 721 and the second magnet 722 and slides back into the correction groove 73, and thus the first limiting ring 61 and the second limiting ring 62 can slide freely along the axis of the first housing 1, namely the first housing 1 and the second housing 2 can also slide freely.

Referring to fig. 4: the correction block 71 has a cavity structure.

Providing the correction block 71 in a cavity structure can reduce the weight of the correction block 71, so that the first magnet 721 and the second magnet 722 can be more easily adsorbed and raised with respect to the correction block 71.

The foregoing examples merely illustrate one or more embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims (10)

1. The shaft pin type three-way force transducer comprises a base (9);

the sensor is characterized by further comprising a first shell (1), a second shell (2), a first steel string (3) and a monitoring device (4);

The first shell (1) is in a cylindrical structure, the first shell (1) and the second shell (2) are arranged in a staggered mode along the axis of the first shell (1), the first shell (1) and the second shell (2) which are adjacent in the axis direction of the first shell (1) are in sliding fit, the staggered first shell (1) and second shell (2) form the outer shape of the sensor, and the integral structure formed by the first shell (1) and the second shell (2) is fixedly arranged on the base (9);

The first steel strings (3) are arranged on the connected end parts of the first shell (1) and the second shell (2) in a straddling mode, the first steel strings (3) are arranged in a plurality, the first steel strings (3) are arranged in the first shell (1) around the axis of the first shell (1), the two ends of each first steel string (3) are respectively connected with the first shell (1) and the second shell (2) which are straddled by the first steel strings (3), and when the first shell (1) and the second shell (2) slide relatively along the axis of the first shell (1), the first steel strings (3) are tensioned or relaxed;

The monitoring device (4) is arranged on one side of the first steel string (3), the base (9) can output alternating current to the first steel string (3), the first steel string (3) vibrates after being electrified, and the monitoring device (4) monitors the vibration frequency of the first steel string (3).

2. The shaft pin type three-way force transducer according to claim 1, further comprising strain detecting devices (5), wherein the number of the strain detecting devices (5) is the same as the sum of the number of the first shells (1) and the second shells (2), one strain detecting device (5) is arranged in each of the first shells (1) and the second shells (2), and the strain detecting devices (5) are used for detecting the strain values of the first shells (1) and the second shells (2) per se.

3. A three-way load cell according to claim 1, characterized in that the monitoring means (4) comprise frequency identification means (41) and fixing means (42);

Two ends of the fixing device (42) are respectively arranged on the adjacent first shell (1) and second shell (2), and the first steel string (3) is arranged on the fixing device (42) along the axis of the first shell (1);

the frequency identification device (41) is arranged at the end part of the fixing device (42), and the frequency identification device (41) identifies the frequency of the first steel string (3) positioned between the two ends of the fixing device (42).

4. A three-way load cell according to claim 3, characterized in that the monitoring device (4) further comprises a zeroing device (43), the zeroing device (43) being arranged at the end of the first steel string (3), the zeroing device (43) providing a constant tension to the first steel string (3).

5. The axial three-way load cell of claim 4 wherein the fixture (42) comprises a fixture assembly (421) and a clamping device (422);

The fixing component (421) is alternatively arranged on the adjacent first shell (1) or second shell (2), and one end of the first steel string (3) is fixedly connected by the fixing component (421);

The clamping device (422) is arranged on the first shell (1) or the second shell (2) which is not provided with the fixing component (421), and the clamping device (422) clamps the first steel string (3).

6. The axial three-way load cell of claim 5, wherein the zeroing means (43) comprises a zeroing string (431), a support bracket (432), and a weight (433);

the two supporting frames (432) are arranged, the two supporting frames (432) are respectively and fixedly arranged at two ends of the fixing device (42), and the two supporting frames (432) are respectively positioned in the first shell (1) and the second shell (2);

One end of the zeroing steel wire (431) is fixedly connected with one end of the first steel wire (3) far away from the fixing component (421), and one end of the zeroing steel wire (431) far away from the first steel wire (3) sequentially penetrates through a supporting frame (432) in the first shell (1) and a supporting frame (432) in the second shell (2) along the axis of the first shell (1);

the weight (433) is fixedly arranged at the end part of the zeroing steel string (431) far away from the first steel string (3).

7. The shaft pin type three-way force transducer according to claim 1, characterized in that the transducer further comprises an anti-falling device (6), the anti-falling device (6) comprises a first limiting ring (61) and a second limiting ring (62);

The two first limiting rings (61) are arranged, the two first limiting rings (61) are fixedly arranged at two ends of the first shell (1) along the axis of the first shell (1), and the first limiting rings (61) protrude to the outside of the first shell (1) along the radial direction of the first shell (1);

The two second limiting rings (62) are arranged at two ends of the second housing (2) along the axis of the first housing (1), when the first housing (1) and the second housing (2) slide relatively, the first limiting rings (61) and the second limiting rings (62) are close to or far away from each other, and the outer diameter of the first limiting rings (61) is larger than the inner diameter of the second limiting rings (62).

8. The three-way axial force transducer of claim 7, further comprising a position correction device (7), the position correction device (7) comprising a correction block (71) and a drive device (72);

The correction groove (73) is formed in the first limiting ring (61) in a penetrating mode along the radial direction of the first shell (1), the correction block (71) is arranged in the correction groove (73) in a sliding mode along the extending direction of the correction groove (73), a groove (711) is formed in the middle of the upper end of the correction block (71), and inclined grooves (712) are formed in two sides of the upper portion of the groove (711);

The driving device (72) is arranged at the side part of the second limiting ring (62), the driving device (72) drives the correction block (71) to slide out of the correction groove (73), and the correction block (71) is clamped with the second limiting ring (62) through the groove (711).

9. The shaft pin type three-way force transducer according to claim 8, further comprising an unlocking device (8), wherein the unlocking device (8) is arranged in the correction groove (73), and the unlocking device (8) drives the correction block (71) to slide into the correction groove (73) against the driving force of the driving device (72) after being electrified.

10. The axial three-way load cell of claim 8, wherein the correction block (71) is of a cavity configuration.