CN117030086B - Lever type large torque tester and standard force sensor in-situ calibration method - Google Patents
Lever type large torque tester and standard force sensor in-situ calibration method Download PDFInfo
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- CN117030086B CN117030086B CN202311263589.XA CN202311263589A CN117030086B CN 117030086 B CN117030086 B CN 117030086B CN 202311263589 A CN202311263589 A CN 202311263589A CN 117030086 B CN117030086 B CN 117030086B
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
- G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention provides a lever type high-torque measuring instrument and a standard force sensor in-situ calibration method. The lever type large torque measuring instrument detects the force value of the loading force at the end part of the lever through the standard force sensor, and the torque value to be measured is obtained by multiplying the detected force value by the length of the arm of the lever. In view of the fact that the force value of a standard force sensor meeting measurement precision, which can be obtained in the market at present, can reach the level of kiloton force, the technical scheme of the invention can accurately measure the torque of a high-torque device. Compared with a dead weight type torque standard machine, the weight is not required to be configured, so that the configuration cost is saved, and the instrument configuration space is saved. In addition, the standard force sensor is calibrated in situ on the tester by means of the double-frame force transmission frame, disassembly is omitted, calibration efficiency is submitted, in addition, the standard force sensor in-situ calibration cannot have the directivity error of the standard force sensor due to different placement directions, and the calibration accuracy is improved.
Description
Technical Field
The invention relates to the technical field of metering, in particular to a lever type high-torque measuring instrument and a standard force sensor in-situ calibration method.
Background
The torque measuring instrument is used for measuring torque, the existing torque measuring instrument for measuring small and medium torque values is used for measuring the torque value generally through connecting a standard torque sensor in series with a torque device to be measured, and the detection precision of the adopted standard torque sensor needs to meet the detection requirement. The torque meter with the structure cannot be applied to measuring the large torque due to the lack of a standard torque sensor with high precision and large torque.
The dead weight type torque standard machine is mainly used for the calibration and calibration work of torque sensors of torque instruments of various grades, and the high accuracy weight is adopted to apply force to a lever to form torque, and the dead weight type torque standard machine on the market at present achieves rated torque of 50KNm due to the limitation of the volume of the weight, and the dead weight type torque standard machine is high in cost and large in occupied space, and the number of standard weights to be configured is large.
Because of the limitations of the two torque measuring devices, it is highly desirable to provide a device capable of measuring large torque values of 100KNm, 200KNm and higher.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a lever type high-torque measuring instrument and a standard force sensor in-situ calibration method.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: a lever-type high torque meter comprising:
a base;
the lever supporting seat is arranged on the base;
the lever is arranged on the lever supporting seat in a way that the middle of the lever can swing left and right through a linear supporting structure, and the length direction of the linear supporting structure is perpendicular to the length direction of the lever;
the rotary connector is fixedly connected with the middle position of the lever;
the check mechanism is arranged on the base, and a torque device to be tested is arranged between the rotary connector and the check mechanism;
standard force sensors are respectively arranged at the left end and the right end of the lever;
the base of the force application mechanism is arranged on the base;
the force transmission frame comprises a first frame body and a second frame body, wherein the first frame body comprises a first top plate, a first bottom plate, a first left connecting rod and a first right connecting rod, and the first left connecting rod and the first right connecting rod are respectively connected with the left end and the right end of the first top plate and the left end of the first bottom plate; the second frame body comprises a second top plate, a second bottom plate, a second left connecting rod and a second right connecting rod, and the second left connecting rod and the second right connecting rod are respectively connected to the left end and the right end of the second top plate and the second bottom plate; the middle position of the lower surface of the first top plate is pressed above the standard force sensor, the first bottom plate passes through the middle space of the second frame body, a force sensor profiling block is arranged at the middle position of the first bottom plate, the middle position of the lower surface of the second top plate is pressed above the force sensor profiling block, and the second bottom plate is connected with a force application part of the force application mechanism through a ball joint.
Further, the standard force sensor is a pressure sensor, and the standard force sensor is installed on the upper surface of the end part of the lever through a force sensor seat.
Further, the device also comprises an assembly seat which is detachably arranged at the end part of the lever through a screw; the force sensor seat is arranged on the assembly seat.
Further, a pressure head mechanism is arranged between the force transmission frame and the standard force sensor, the pressure head mechanism comprises a strip pressure head blade and a strip pressure head cutter bearing, the strip pressure head blade is arranged on the standard force sensor, a round hole which is concave and matched with a cylinder at the top end of the standard force sensor is arranged at the center of the bottom surface of the strip pressure head blade, the bottom surface of the round hole is a convex spherical surface, and the top end of the strip pressure head blade is a blade with a vertical section in an inverted V shape; the bottom surface of the strip-shaped pressure head knife bearing is a knife groove with a vertical section in an inverted V shape, and the strip-shaped pressure head knife bearing is fixedly connected with the force transmission frame through a mounting seat.
Further, a front support and a rear support are arranged on the base at positions right below the end part of the lever, shaft holes which are coaxially arranged are respectively arranged on the front support and the rear support, and the axial direction of the shaft holes is perpendicular to the length direction of the lever; the force application mechanism is a worm and gear screw elevator, mounting shafts which are coaxially arranged are respectively arranged on the front side and the rear side of a machine seat of the worm and gear screw elevator, and the axis of the lifting shaft of the worm and gear screw elevator is perpendicularly intersected with the axis of the mounting shaft.
Further, the lever support seat comprises a lever front support seat positioned at the front side of the lever and a lever rear support seat positioned at the rear side of the lever; concentric circular spigot grooves are respectively arranged on the front side surface and the rear side surface of the middle part of the lever, and support shaft holes penetrating front and rear are arranged on the upper half part of the circular spigot groove of the lever; the lever support shaft comprises a cylindrical part positioned in the middle, a front body part positioned at the front end and a rear body part positioned at the rear end, and the cylindrical part is matched and installed with a support shaft hole of the lever; the end face of the rotary connector, which is in butt joint with the lever, is provided with a major arc spigot step surface, the major arc spigot step surface of the rotary connector is matched with a circular spigot groove on the front side surface of the lever, the rotary connector is also provided with a square groove with a downward opening, the square groove of the rotary connector is matched with the front body part of the lever supporting shaft, and the axis of the front connecting shaft of the rotary connector is coaxial with the axis of the circular spigot groove; a rotary balancer is arranged at the rear side of the lever, a major arc spigot step surface and a square groove with a downward opening are also arranged on the rotary balancer, the major arc spigot step surface of the rotary balancer is matched with a round spigot groove at the rear side surface of the lever, and the square groove of the rotary balancer is matched with the rear body part of the lever supporting shaft; the linear supporting structure comprises a lever knife bearing and a lever blade, the lever knife bearing is mounted at the tops of the front supporting seat and the rear supporting seat of the lever, a V-shaped groove is formed in the top surface of the lever knife bearing, the lever blade is mounted at the lower parts of the front body part and the rear body part of the lever supporting shaft, a V-shaped blade is arranged on the bottom surface of the lever blade, and the cutting edge straight line of the V-shaped blade of the lever blade is coaxial with the axis of the circular spigot groove of the lever.
Further, a stop hole with the outer diameter larger than that of the support shaft hole is formed in the front port part of the support shaft hole of the lever, and a positioning lug groove is further formed in the stop Kong Bianbu; the front end of the cylindrical part of the lever support shaft is provided with a stop flange part embedded in the stop hole, and the periphery of the stop flange part is provided with a positioning lug part matched with the positioning lug groove.
Further, the base is provided with a guide rail which is arranged front and back, the guide rail is translatably provided with a first bracket, and the non-return mechanism comprises a speed-reducing rotary driving device.
Further, a second support is translatably mounted on the guide rail, the non-return mechanism comprises a support block, a chute in the left-right direction is arranged on the second support, and the support block is mounted on the second support and can move along the chute.
The in-situ calibration method of the standard force sensor is based on the lever type high-torque measuring instrument, when the calibration is performed, the force sensor profiling block is replaced by a high-precision force sensor, and before the force application mechanism is pressurized, the readings of the standard force sensor and the high-precision force sensor are zeroed; and after the lever is balanced, the reading difference of the standard force sensor and the high-precision force sensor at the same end of the lever is compared, and the calibration of the standard force sensor is completed.
The invention has the following beneficial effects:
1) The lever type large torque measuring instrument detects the force value of the loading force at the end part of the lever through the standard force sensor, and the torque value to be measured can be obtained by multiplying the detected force value by the length of the arm of the lever force. When the length of the lever arm is 2m, only a standard force sensor with a detection force value reaching 100KN needs to be configured for reaching the rated torque of 200KNm, and the maximum force value of the standard force sensor meeting the measurement precision can reach the level of kiloton force, so that the lever type large torque measuring instrument structure can also be used for measuring the large torque value of a higher torque level above 200 KNm. Compared with a dead weight type torque standard machine, the weight is not required to be configured, so that the configuration cost is saved, and the instrument configuration space is saved.
2) According to the standard force sensor in-situ calibration method, the standard force sensor is calibrated in situ on the tester, disassembly is omitted, calibration efficiency is submitted, the standard force sensor in-situ calibration cannot have the standard force sensor directivity errors caused by different placement directions, and the calibration accuracy is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the lever-type high torque meter according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of the lever-type high torque meter of the present invention along the length direction of the lever.
Fig. 3 is a schematic structural view of the lever support base.
Fig. 4 is a schematic view of the front side structure of the lever including the lever support shaft.
Fig. 5 is a schematic rear side structural view of the lever including the lever support shaft.
Fig. 6 is a schematic view of the front side structure of the lever.
Fig. 7 is a schematic structural view of the lever support shaft.
Fig. 8 is a schematic structural view of the swivel connector.
Fig. 9 is a schematic view of the structure of the lever end standard force sensor mounting.
Fig. 10 is a cross-sectional view of the lever end standard force sensor mounting location.
Fig. 11 is a schematic structural view of a limiting mechanism installed at the pressing head mechanism.
Fig. 12 is a schematic structural view of the force transmission frame.
Names of the corresponding parts indicated by numerals and letters in the drawings:
10-a base; 20-a lever support base; 21-a lever front support seat; 22-a lever rear support base; 23-lever knife bearing; 30-lever; 301-a circular spigot groove; 302-supporting shaft holes; 303-a stop hole; 304-positioning ear slots; 31-lever support shaft; 311-cylindrical portion; 312-front body; 313-rear body; 314-stop flange portion; 315-positioning the ear; 32-lever blade; 33-swivel connector; 331-major arc spigot step surface; 332-square groove; 34-a spin balancer; 40-standard force sensor; 41-an assembly seat; 411-floor section; 412-an outer baffle; 413-inner barrier walls; 42-a force sensor mount; 421-elongated connecting holes; 422-first locking bolt; 43-guiding structure; 431-front guide bar; 432-rear guide bar; 44-a displacement adjustment mechanism; 441-inclined wedge plate; 442-lateral jack bolts; 50-a force application mechanism; 51-mounting a shaft; 60-a force transmission frame; 61-a first frame; 611-a first top plate; 612-a first backplane; 613-a first left connecting rod; 614-first right connecting rod; 62-a second frame; 621-a second top plate; 622-a second bottom plate; 623-a second left connecting rod; 624-a second right connecting rod; 63-force sensor profiling block; 70-a pressure head mechanism; 71-a strip-shaped pressure head blade; 72-a strip-shaped pressure head knife bearing; 73-round holes; 74-supporting rods; 75-horizontal scale ejector rod; 76-locking screw; 81-a front support; 82-a rear support; 91-a guide rail; 92-a first bracket; 93-decelerating slewing drive means; 94-a second bracket; 941-a chute; 95-supporting blocks.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, 2 and 12, one embodiment of the present invention is: a lever-type high torque meter comprising:
a base 10;
a lever support base 20 mounted on the base 10;
the lever 30 is arranged on the lever support base 20 in a manner that the middle position can swing left and right through a linear support structure, and the length direction of the linear support structure is perpendicular to the length direction of the lever;
a swivel connector 33 fixedly connected to the middle position of the lever 30, the swivel center of the swivel connector 33 being coaxial with the linear fulcrum of the linear support structure;
a check mechanism mounted on the base 10, the torque device to be tested being mounted between the swivel connector 33 and the check mechanism;
standard force sensors 40, which are respectively installed at the left and right ends of the lever 30;
a biasing mechanism 50 having a base mounted on the base 10;
the force transmission frame 60 comprises a first frame body 61 and a second frame body 62, wherein the first frame body 61 comprises a first top plate 611, a first bottom plate 612, a first left connecting rod 613 and a first right connecting rod 614, and the first left connecting rod 613 and the first right connecting rod 614 are respectively connected at the left end and the right end of the first top plate 611 and the first bottom plate 612; the second frame 62 includes a second top plate 621, a second bottom plate 622, a second left connecting rod 623, and a second right connecting rod 624, the second left connecting rod 623 and the second right connecting rod 624 being connected to left and right ends of the second top plate 621 and the second bottom plate 622, respectively; the middle position of the lower surface of the first top plate 611 is pressed above the standard force sensor 40, the first bottom plate 612 passes through the middle space of the second frame 62, the force sensor profiling block 63 is mounted at the middle position of the first bottom plate 612, the middle position of the lower surface of the second top plate 621 is pressed above the force sensor profiling block 63, and the second bottom plate 622 is connected with the force application component of the force application mechanism 50 through a ball joint.
The beneficial effects of adopting above-mentioned technical scheme are: the force value of the loading force at the end part of the lever is detected through a standard force sensor, and the torque value to be detected can be obtained by multiplying the detected force value by the length of the arm of force of the lever. For the lever type large torque measuring instrument, when the length of a lever arm is 2m, only a standard force sensor with a detection force value reaching 100KN (ten tons of force) is required to be configured for reaching rated torque of 200KNm, and the maximum force value of the standard force sensor meeting measurement precision can reach kiloton of force level at present, so that the lever type large torque measuring instrument structure can also be used for measuring large torque values of more than 200 KNm. Compared with a dead weight type torque standard machine, the weight is not required to be configured, so that the configuration cost is saved, and the instrument configuration space is saved.
The in-situ calibration method for the standard force sensor is based on the lever type high-torque measuring instrument in the embodiment, when in calibration, the force sensor profiling block is replaced by a high-precision force sensor, and before the force application mechanism is pressurized, the readings of the standard force sensor and the high-precision force sensor are zeroed; and after the lever is balanced, the reading difference of the standard force sensor and the high-precision force sensor at the same end of the lever is compared, and the calibration of the standard force sensor is completed.
The beneficial effects of adopting above-mentioned technical scheme are: when the torque value is measured, a force sensor profiling block is used; when the standard force sensor is calibrated, the standard force sensor can be calibrated only by replacing the force sensor profiling block with the high-precision force sensor, the standard force sensor is calibrated in situ on the tester, disassembly is omitted, calibration efficiency is submitted, and in addition, the standard force sensor in-situ calibration cannot have directional errors caused by different placement directions of the standard force sensor, so that the accuracy of measuring the loading force is improved.
As shown in fig. 9 and 10, in other embodiments of the present invention, the standard force sensor 40 is a pressure sensor, the standard force sensor 40 is mounted on the upper surface of the end of the lever 30 through the force sensor seat 42, and the end of the lever 30 is provided with a guide structure 43 for regulating the force sensor seat 42 to move along the length direction of the lever; and a displacement adjustment mechanism 44 for adjusting the position of the force sensor mount 42 in the lever length direction. The beneficial effects of adopting above-mentioned technical scheme are: the length of the lever arm is convenient to adjust.
As shown in fig. 9 and 10, in other embodiments of the present invention, the present invention further includes an assembly seat 41, where the assembly seat 41 is detachably mounted on an end of the lever 30 through a screw; the force sensor mount 42, the guide structure 43, and the displacement adjustment mechanism 44 are all mounted on the assembly mount 41. The beneficial effects of adopting above-mentioned technical scheme are: and the manufacturing, the processing and the assembly are convenient.
As shown in fig. 9 and 10, in other embodiments of the present invention, the assembly seat 41 includes a bottom plate portion 411, an outer blocking wall 412 located at a side near the end of the lever, and an inner blocking wall 413 located at a side near the center of the lever, the guide structure 43 includes a front guide bar 431 and a rear guide bar 432 fixedly installed at the front and rear sides of the bottom plate portion, respectively, the force sensor seat 42 is located between the front guide bar 431 and the rear guide bar 432, both front and rear sides of the force sensor seat 42 are provided with elongated connection holes 421 disposed along the length direction of the lever, and the first locking bolt 422 passes through the elongated connection holes 421 to lock the force sensor seat 42 to the assembly seat 41; the side surface of the force sensor seat 42, which is close to the outer baffle wall 412, is a vertical surface, the side surface of the force sensor seat 42, which is close to the inner baffle wall 413, is an inclined surface, the displacement adjusting mechanism 44 comprises a wedge plate 441 and a lateral jacking bolt 442, the wedge plate 441 is positioned between the inner baffle wall 413 and the force sensor seat 42, the surface of the wedge plate 441, which is abutted against the inner baffle wall 413, is a vertical surface, the surface of the wedge plate 441, which is abutted against the force sensor seat 42, is an inclined surface, the inclined surface of the wedge plate 441 and the inclined surface of the force sensor seat 42 form the same inclined angle with the length direction of the lever, the lateral jacking bolt 442 is installed on the outer baffle wall 412 through threads, and the head end of the lateral jacking bolt 442 is jacked on the vertical surface of the force sensor seat 42. The beneficial effects of adopting above-mentioned technical scheme are: the accurate adjustment and the location to force sensor seat position are helped, the accuracy of lever arm length is ensured.
In other embodiments of the present invention, a displacement measurement mechanism is also included for measuring the distance that the force sensor mount 42 moves in the length direction of the lever. The displacement measuring mechanism is a spiral differential head arranged on the outer baffle wall, the head end of the spiral differential head is propped against the vertical surface of the force sensor seat 42, and the displacement distance of the force sensor seat can be accurately measured by comparing the readings of the spiral differential head before and after displacement. The beneficial effects of adopting above-mentioned technical scheme are: the accuracy and convenience of measuring the displacement distance of the force sensor seat are improved.
A lever arm length measuring method, the total weight force value of a known force sensor seat, a standard force sensor and a force transmission frame connected between the standard force sensor and a force application mechanism is G1, comprising the following steps:
step 1, firstly, a force sensor seat at one end of a lever to be detected is kept at an initial position corresponding to a nominal force arm length, a force application mechanism at one end of the lever to be detected applies a loading force F1, then the force application mechanism at the other end of the lever is loaded, so that the lever is balanced, the loading force of the force application mechanism at the other end of the lever is recorded as F0, and at the moment, the moment M1= (F1+G1) L of the end of the lever to be detected;
step 2, a force sensor seat at the end to be detected is locked after moving inwards by delta L along the length direction of a lever arm, a force application mechanism at the other end of the lever applies a loading force with a force application value of F0 again, the force application mechanism at the end to be detected applies a loading force F2 until the lever is balanced again, and at the moment M2 = (F2+G1) at the end to be detected of the lever is (L-delta L);
in step 3, since the moment at the other end of the lever remains unchanged when the lever is balanced twice, an equation m1=m2 is constructed, and the measured arm length l= (g1+f2) ×Δl/(F2-F1) of the arm length L of the arm to be measured is calculated.
According to the measuring method, when the lever is balanced twice, the moment applied to the other end opposite to the end to be measured is unchanged, and the moment when the lever is balanced twice at the end to be measured is established into an equation, so that the actual arm length of the arm of the actual arm of the end to be measured can be directly calculated, and the accuracy of the nominal arm length of the lever can be rapidly verified. Compared with the traditional detection mode adopting the three-coordinate measuring instrument, the invention does not need to disassemble and assemble the whole lever, thereby greatly saving labor, improving the verification efficiency and saving the verification cost. The whole tester is not required to be disassembled and assembled, and based on the basic principle of torque measurement, the whole tester is kept in the original state, the arm length measurement result is more accurate, and the accuracy of torque measurement is improved.
As shown in fig. 12, in other embodiments of the present invention, a front support 81 and a rear support 82 are provided on the base at positions directly below the end of the lever, and shaft holes are provided on the front support 81 and the rear support 82, respectively, and the axial direction of the shaft holes is perpendicular to the length direction of the lever; the force application mechanism 50 is a worm and gear screw lifter, and mounting shafts 51 coaxially arranged are respectively arranged on the front side and the rear side of a machine base of the worm and gear screw lifter, and the axis of the lifting shaft of the worm and gear screw lifter is perpendicularly intersected with the axis of the mounting shaft 51. The beneficial effects of adopting above-mentioned technical scheme are: ensuring that a vertically downward pulling force is applied to the force transmission frame.
In other embodiments of the present invention, as shown in fig. 1 and 12, the mounting positions of the front and rear holders 81 and 82 on the base 10 are adjustable in the length direction of the lever, and are locked by bolts after adjustment.
In other embodiments of the present invention, a distance measuring mechanism for measuring the distance of movement of the front and rear supports on the base along the length of the lever is further included. When the force sensor seat is used for adjusting the position along the length direction of the lever, the position of the force application mechanism can be correspondingly adjusted, so that the force application direction is ensured to be vertically downward when the lever is balanced.
As shown in fig. 9 and 10, in other embodiments of the present invention, a pressing head mechanism 70 is arranged between the force transmission frame 60 and the standard force sensor 40, the pressing head mechanism 70 comprises a bar-shaped pressing head blade 71 and a bar-shaped pressing head blade 72, the bar-shaped pressing head blade 71 is mounted on the standard force sensor 40, a round hole 73 which is concave and matched with a cylinder at the top end of the standard force sensor 40 is arranged at the center of the bottom surface of the bar-shaped pressing head blade 71, the bottom surface of the round hole is a convex spherical surface, and the top end of the bar-shaped pressing head blade 71 is a blade with an inverted V-shaped vertical section; the bottom surface of the strip-shaped pressure head knife bearing 72 is a knife groove with a vertical section in an inverted V shape, and the strip-shaped pressure head knife bearing 72 is fixedly connected with the force transmission frame 60 through a mounting seat. The beneficial effects of adopting above-mentioned technical scheme are: the loading force of the force application mechanism is ensured to be transmitted along the line and finally acts on the center of the standard force sensor, and the calculation accuracy of the lever torque is ensured.
As shown in fig. 11, in other embodiments of the present invention, the left and right sides of the bar-shaped indenter blade 71 are inclined surfaces that are mirror-symmetrical, and the distance between the inclined surfaces of the left and right sides is narrow at the upper end and wide at the lower end; the force sensor seat 42 is further provided with a limiting mechanism, the limiting mechanism comprises four groups of supporting rods 74, a horizontal scale ejector rod 75 and a locking screw 76, the supporting rods 74 are respectively arranged at the front end and the rear end of the left side and the right side of the strip-shaped pressure head blade 71, the horizontal scale ejector rod 75 penetrates through a horizontal through mounting hole at the top end of the supporting rod 74, the head end of the horizontal scale ejector rod 75 is contacted or is close to the left side and the right side of the strip-shaped pressure head blade 71, the locking screw 76 is vertically connected to the top end of the supporting rod 74 through threads, and the head end of the locking screw 76 is propped against the rod body of the horizontal scale ejector rod 75. When the force is not applied, the head of the horizontal scale ejector rod 75 is in contact with the left side surface and the right side surface of the strip-shaped pressure head blade 71, after the force is applied, the standard force sensor 40 is subjected to downward slight compression, and as the left side surface and the right side surface of the strip-shaped pressure head blade 71 are inclined surfaces, the head of the horizontal scale ejector rod is separated from the left side surface and the right side surface of the strip-shaped pressure head blade, but the gap is small, so that the linear force application point is kept vertical to the lever arm, the accuracy of the arm length is improved, and the force application is not influenced by the standard force sensor. The beneficial effects of adopting above-mentioned technical scheme are: the cutting edge of the strip-shaped pressure head can be kept perpendicular to the length direction of the lever through the limiting mechanism, and the accuracy of the length of the lever arm is ensured.
As shown in fig. 3 to 8, in other embodiments of the present invention, the lever support base 20 includes a lever front support base 21 located at the front side of the lever and a lever rear support base 22 located at the rear side of the lever; concentric circular spigot grooves 301 are respectively arranged on the front side surface and the rear side surface of the middle part of the lever 30, and a support shaft hole 302 penetrating front and rear is arranged on the upper half part of the circular spigot groove 301 of the lever; the lever support shaft 31 comprises a middle cylindrical part 311, a front body part 312 at the front end and a rear body part 313 at the rear end, wherein the cylindrical part 311 is matched with the support shaft hole 302 of the lever; the end surface of the rotary connector 33, which is in butt joint with the lever, is provided with a major arc spigot step surface 331, the major arc spigot step surface 331 of the rotary connector 33 is matched with a round spigot groove 301 on the front side surface of the lever, the rotary connector 33 is also provided with a square groove 332 with a downward opening, the square groove 332 of the rotary connector 33 is matched with a front body part 312 of the lever supporting shaft 31, and the axis of a front end connecting shaft of the rotary connector 33 is coaxial with the axis of the round spigot groove 301; a rotary balancer 34 is arranged at the rear side of the lever, a major arc spigot step surface and a square groove with a downward opening are also arranged on the rotary balancer 34, the major arc spigot step surface of the rotary balancer 34 is matched with the round spigot groove 301 at the rear side of the lever, and the square groove of the rotary balancer 34 is matched with the rear body 313 of the lever supporting shaft 31; the linear supporting structure comprises a lever knife bearing 23 and a lever knife blade 32, wherein the lever knife bearing 23 is arranged at the tops of the lever front supporting seat 21 and the lever rear supporting seat 22, the top surface of the lever knife bearing 23 is provided with a V-shaped groove, the lever knife blade 32 is arranged at the lower parts of the front body 312 and the rear body 313 of the lever supporting shaft, the bottom surface of the lever knife blade 32 is provided with a V-shaped knife blade, and the cutting edge straight line of the V-shaped knife blade of the lever knife blade 32 is coaxial with the axis of the circular spigot groove 301 of the lever. The beneficial effects of adopting above-mentioned technical scheme are: the device is convenient to manufacture, and can improve the coaxiality between the middle rotary fulcrum of the lever and the center of the rotary connector, and provide torque measurement accuracy.
As shown in fig. 6 and 7, in other embodiments of the present invention, a front end port of a supporting shaft hole 302 of the lever is provided with a stop hole 303 with an outer diameter larger than that of the supporting shaft hole, and a positioning ear groove 304 is further provided at a side of the stop hole 303; the front end of the cylindrical part of the lever support shaft 31 is provided with a stop flange part 314 embedded in the stop hole, and the periphery of the stop flange part 314 is provided with a positioning lug part 315 matched with the positioning lug groove. The lever support shaft is convenient to install and position with high precision.
In other embodiments of the invention, as shown in fig. 1, a guide rail 91 is provided on the base 10, and a first bracket 92 is translatably mounted on the guide rail 91, and the non-return mechanism includes a decelerating rotary drive 93. And the rotary torque sensor is convenient to install and measure.
In other embodiments of the present invention, as shown in fig. 1, a second bracket 94 is translatably mounted on the guide rail 91, and the check mechanism includes a support block 95, a sliding groove 941 is provided on the second bracket 94 in the left-right direction, and the support block 95 is mounted on the second bracket 94 and is movable along the sliding groove 941. And the torque wrench is convenient to install and measure.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A lever-type large torque meter, characterized by comprising:
a base;
the lever supporting seat is arranged on the base; the lever support seat comprises a lever front support seat positioned at the front side of the lever and a lever rear support seat positioned at the rear side of the lever;
the lever is arranged on the lever supporting seat in a way that the middle of the lever can swing left and right through a linear supporting structure, and the length direction of the linear supporting structure is perpendicular to the length direction of the lever; concentric circular spigot grooves are respectively arranged on the front side surface and the rear side surface of the middle part of the lever, and support shaft holes penetrating front and rear are arranged on the upper half part of the circular spigot groove of the lever; the lever support shaft comprises a cylindrical part positioned in the middle, a front body part positioned at the front end and a rear body part positioned at the rear end, and the cylindrical part is matched and installed with a support shaft hole of the lever; the linear supporting structure comprises a lever knife bearing and a lever blade, the lever knife bearing is arranged at the tops of the front supporting seat and the rear supporting seat of the lever, V-shaped grooves are formed in the top surface of the lever knife bearing, the lever blade is arranged at the lower parts of the front body part and the rear body part of the lever supporting shaft, V-shaped blades are arranged on the bottom surface of the lever blade, and the cutting tip straight line of the V-shaped blades of the lever blade is coaxial with the axis of the circular spigot groove of the lever;
the rotary connector is fixedly connected with the middle position of the lever;
the check mechanism is arranged on the base, and a torque device to be tested is arranged between the rotary connector and the check mechanism;
standard force sensors are respectively arranged at the left end and the right end of the lever;
the base of the force application mechanism is arranged on the base;
the force transmission frame comprises a first frame body and a second frame body, wherein the first frame body comprises a first top plate, a first bottom plate, a first left connecting rod and a first right connecting rod, and the first left connecting rod and the first right connecting rod are respectively connected with the left end and the right end of the first top plate and the left end of the first bottom plate; the second frame body comprises a second top plate, a second bottom plate, a second left connecting rod and a second right connecting rod, and the second left connecting rod and the second right connecting rod are respectively connected to the left end and the right end of the second top plate and the second bottom plate; the middle position of the lower surface of the first top plate is pressed above the standard force sensor, the first bottom plate passes through the middle space of the second frame body, a force sensor profiling block is arranged at the middle position of the first bottom plate, the middle position of the lower surface of the second top plate is pressed above the force sensor profiling block, and the second bottom plate is connected with a force application part of the force application mechanism through a ball joint.
2. The lever-type high torque meter according to claim 1, wherein the standard force sensor is a pressure sensor, and the standard force sensor is mounted on an upper surface of an end portion of the lever via a force sensor mount.
3. The lever-type high torque meter according to claim 2, further comprising an assembly mount detachably mounted to an end of the lever via a screw; the force sensor seat is arranged on the assembly seat.
4. The lever type high torque measuring instrument according to claim 1, wherein a pressure head mechanism is arranged between a first top plate of the force transmission frame and the standard force sensor, the pressure head mechanism comprises a strip pressure head blade and a strip pressure head knife bearing, the strip pressure head blade is arranged on the standard force sensor, a round hole which is concave and matched with a cylinder at the top end of the standard force sensor is arranged at the center of the bottom surface of the strip pressure head blade, the bottom surface of the round hole is a convex spherical surface, and the top end of the strip pressure head blade is a blade with an inverted V-shaped vertical section; the bottom surface of the strip-shaped pressure head knife bearing is a knife groove with a vertical section in an inverted V shape, and the strip-shaped pressure head knife bearing is fixedly connected with the force transmission frame through a mounting seat.
5. The lever-type high torque meter according to claim 1, wherein a front support and a rear support are arranged on the base at positions right below the end part of the lever, shaft holes which are coaxially arranged are respectively arranged on the front support and the rear support, and the axial direction of the shaft holes is perpendicular to the length direction of the lever; the force application mechanism is a worm and gear screw elevator, mounting shafts which are coaxially arranged are respectively arranged on the front side and the rear side of a machine seat of the worm and gear screw elevator, and the axis of the lifting shaft of the worm and gear screw elevator is perpendicularly intersected with the axis of the mounting shaft.
6. The lever-type high torque meter according to claim 1, wherein a major arc spigot step surface is provided on an end surface of the swivel connector, which is abutted to the lever, the major arc spigot step surface of the swivel connector is matched with a circular spigot groove on the front side surface of the lever, a square groove with a downward opening is further provided on the swivel connector, the square groove of the swivel connector is matched with a front body part of the lever support shaft, and an axis of a front end connecting shaft of the swivel connector is coaxial with an axis of the circular spigot groove; the rear side of the lever is provided with a rotary balancer, the rotary balancer is also provided with a major arc spigot step surface and a square groove with a downward opening, the major arc spigot step surface of the rotary balancer is matched with the round spigot groove on the rear side of the lever, and the square groove of the rotary balancer is matched with the rear body of the lever supporting shaft.
7. The lever type high torque meter according to claim 6, wherein a front port portion of the support shaft hole of the lever is provided with a stopper hole having an outer diameter larger than that of the support shaft hole, and the stopper Kong Bianbu is further provided with a positioning lug groove; the front end of the cylindrical part of the lever support shaft is provided with a stop flange part embedded in the stop hole, and the periphery of the stop flange part is provided with a positioning lug part matched with the positioning lug groove.
8. The lever-type high torque meter according to claim 1, wherein the base is provided with a guide rail arranged front and back, the guide rail is translatably provided with a first bracket, and the non-return mechanism comprises a decelerating and slewing drive device.
9. The lever-type high torque meter according to claim 8, wherein the guide rail is translatably mounted with a second bracket, the check mechanism comprises a support block, a chute in the left-right direction is provided on the second bracket, and the support block is mounted on the second bracket and is movable along the chute.
10. The in-situ calibration method of the standard force sensor is based on the lever-type high-torque measuring instrument of claim 1, and is characterized in that when in calibration, the force sensor profiling block is replaced by a high-precision force sensor, and before the force application mechanism is pressurized, the readings of the standard force sensor and the high-precision force sensor are zeroed; and after the lever is balanced, the reading difference of the standard force sensor and the high-precision force sensor at the same end of the lever is compared, and the calibration of the standard force sensor is completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311263589.XA CN117030086B (en) | 2023-09-27 | 2023-09-27 | Lever type large torque tester and standard force sensor in-situ calibration method |
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| CN202311263589.XA CN117030086B (en) | 2023-09-27 | 2023-09-27 | Lever type large torque tester and standard force sensor in-situ calibration method |
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| CN117030086B true CN117030086B (en) | 2024-01-23 |
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