CN216593121U - Mathematical measuring instrument - Google Patents

Abstract

The utility model relates to the technical field of mathematical measurement, in particular to a mathematical measurement instrument which can rapidly measure the diameters of irregular cylinders such as trunks and the like, and has small deviation of measurement results and high accuracy; the device comprises two L-shaped frames, a connecting pin, a plurality of clamping mechanisms, two ring rails, a rail car, a digital display host, a measuring arm and two measuring claws, one ends of the two L-shaped frames are rotatably connected through a pin shaft, the other ends of the two L-shaped frames are fixedly inserted and connected through the connecting pin, the L-shaped frames are provided with two arm plates which are perpendicular to each other, the clamping mechanisms are arranged on the arm plates of the two L-shaped frames, the two ring rails are respectively arranged on the two L-shaped frames through supports, the two ends of the two ring rails are butted, the two ring rails form a circular ring, the rail car is arranged on the two ring rails in a rolling manner, the digital display host is arranged on the rail car through the supports, the measuring arm is arranged on the supports of the digital display host in a sliding manner, the digital display host reads grating scale values of the measuring arm, and the two measuring claws are respectively arranged at the two ends of the two measuring arms in a sliding manner.

Description

Mathematical measuring instrument

Technical Field

The utility model relates to the technical field of mathematical measurement, in particular to a mathematical measurement instrument.

Background

The measurement is that according to a certain rule, the phenomenon observed is described by data, namely, objects are quantitatively described, the measurement is a quantitative process of non-quantitative objects, the general mathematical measurement of the objects comprises the measurement in the aspects of volume, weight, diameter and the like, for the objects with regular shapes, the parameters such as diameter, length, width and the like can be conveniently measured by tools such as a ruler and the like, but for irregular objects, the measurement tools such as the ruler and the like can hardly measure the section size of the irregular objects; in practical application, a forest worker needs to measure the diameter of a tree so as to finely manage the tree, the trunk section of the tree is irregular, meanwhile, the equal diameter measurement of the tree generally can take the maximum value, the minimum value and the average value of the diameter, and the measurement cannot be directly and accurately performed by using tools such as a ruler, so that the measurement process is time-consuming and labor-consuming, the measurement result has large deviation and poor accuracy.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the mathematical measurement instrument which can rapidly measure the diameters of irregular cylinders such as trunks and the like, and has small deviation of measurement results and high accuracy.

The utility model discloses a mathematical measurement instrument, which comprises two L-shaped frames, a connecting pin, a plurality of clamping mechanisms, two ring rails, a rail car, a digital display host, a measurement arm and two measuring claws, wherein one ends of the two L-shaped frames are rotationally connected through a pin shaft, the other ends of the two L-shaped frames are fixedly inserted through the connecting pin, the L-shaped frames are provided with two arm plates which are perpendicular to each other, the clamping mechanisms are arranged on the arm plates of the two L-shaped frames, the two ring rails are respectively arranged on the two L-shaped frames through supports, the two ends of the two ring rails are butted, so that the two ring rails form a circular ring, the rail car is arranged on the two ring rails in a rolling manner, the digital display host is arranged on the rail car through the supports, the measurement arm is arranged on the supports of the digital display host in a sliding manner, the digital display host reads grating scale values of the measurement arm, and the two measuring claws are respectively arranged at the two ends of the two measurement arms in a sliding manner; set up digital display host computer and return to zero, with two L type frame suits on the trunk of trees, it is fixed to use the connecting pin to peg graft two L type frames, two ring rail butt joint become complete rings, operate a plurality of fixture, make a plurality of fixture centre gripping trunks, adjust the length of two gauges, make two gauges contact with the both ends of trunk respectively, the operation railcar rotates a week along two ring rails, the railcar rotates a week around the trunk promptly, the continuous extension of change of trunk diameter is followed to pivoted in-process measuring arm under the effect of two gauges, the digital display host computer is data real-time recording, the maximum value of trunk diameter is selected to final digital display host computer, minimum and mean value, the measurement process is quick light, the measuring result deviation is little, the accuracy is high.

Preferably, the clamping mechanism further comprises a threaded rod, a screwing handle, a threaded sleeve, a clamping arc plate and a friction block, wherein the screwing handle is installed at the outer end of the threaded rod, through holes are formed in the middle of the arm plate of the L-shaped frame, the threaded sleeve is installed on the through holes of the arm plate of the L-shaped frame, the threaded rod is in rotating threaded connection with the threaded sleeve, the inner end of the threaded rod is in rotating connection with the outer wall of the clamping arc plate, the clamping arc plate is located on the inner side of the L-shaped frame, and the friction block is arranged inside the clamping arc plate; through screwing the rotation threaded rod, make the threaded rod push centre gripping arc board centre gripping on the trunk under the effect of thread bush, frictional force when increasing the centre gripping through the clutch blocks can the trunk of different diameters of centre gripping, and centre gripping stability is good, and the commonality is high.

Preferably, the rail car still includes two hypoplastron, upper plate, a plurality of rail wheel, pushes away handle and measurement cantilever crane, and two hypoplastron are located the inside and outside both sides of the below of circular rail respectively, and the upper plate is located the top of circular rail, and the both ends of a plurality of digital display host computers are connected with two hypoplastron and upper plate rotation respectively, and a plurality of rail wheel are located the inside and outside both sides of circular rail. The track wheels are all in rolling connection with the circular track, one end of the push handle is connected with the outer walls of the upper plate and the lower plate through a connecting seat, the measuring arm support is installed on the upper end face of the upper plate, and the digital display host is installed on the measuring arm support; a plurality of rail wheels are installed on the ring rail in a rolling mode, so that the operation pushing handle can push the digital display host to rotate around the trunk along the ring rail, the measurement work is easy and convenient, the work efficiency is improved, and the work intensity is reduced.

Preferably, the measuring arm further comprises a measuring arm sliding sleeve, a telescopic measuring arm and a measuring jaw sliding sleeve, the measuring arm sliding sleeve is slidably mounted in the measuring arm frame, the telescopic measuring arm is slidably mounted in the measuring arm sliding sleeve, a tension spring is arranged inside the telescopic measuring arm, a grating is arranged on the side wall of the telescopic measuring arm, a digital display host reads and records a grating scale value of the telescopic measuring arm, two measuring jaw sliding sleeves are respectively mounted at two ends of the telescopic measuring arm, the two measuring jaws are slidably mounted in the two measuring jaw sliding sleeves, and the two measuring jaw sliding sleeves are both perpendicular to the telescopic measuring arm; extension spring in the flexible gauge arm makes flexible gauge arm keep the trend of shrink for two gauge claws contact with the trunk all the time, and the continuous flexible change of diameter change of flexible gauge arm following the trunk, digital display host computer read and take notes the measured value of flexible gauge arm in real time, and the measuring arm sliding sleeve is followed the trunk diameter change and is constantly removed in measuring the cantilever crane simultaneously, reduces the deformation that the horizontal external force that flexible gauge arm received caused, improves measurement accuracy.

Preferably, the measuring jaw further comprises a measuring jaw square sliding tube, a measuring jaw head and a plurality of rollers, the measuring jaw square sliding tube is slidably mounted in the measuring jaw sliding sleeve, the measuring jaw head is slidably mounted in the measuring jaw square sliding tube, the plurality of rollers are respectively rotatably mounted on the upper side and the lower side of the outer end of the measuring jaw head, and the plurality of rollers are all located on the inner side of the measuring jaw head; the installation relative position of measurement claw side slide tube and measurement claw sliding sleeve is adjusted according to the diameter of trunk, and a plurality of gyro wheels of trunk both sides all with trunk surface in close contact with rotate the relative position of two measurement claw heads change real-time change quantity claw head and measurement claw side slide tube of measuring along with the change of trunk, make a plurality of gyro wheels remain throughout with trunk in close contact with, improve and measure the accuracy.

Preferably, the device also comprises two gradienters, wherein the two gradienters are respectively arranged on the two L-shaped frames and are vertically arranged; after the two L-shaped frames are clamped on the trunk, the heights of the two L-shaped frames are finely adjusted, so that the two gradienters are in a horizontal state, the two L-shaped frames are in the same horizontal plane, the whole measuring interface is in the same horizontal plane, and the measuring accuracy is improved.

Preferably, the L-shaped frame, the lower plate, the upper plate, the measuring jaw sliding sleeve, the measuring jaw square sliding pipe and the measuring jaw head are all made of aluminum alloy; through the above arrangement, the structural strength is ensured, the structural weight is reduced, and the portability is improved.

Compared with the prior art, the utility model has the beneficial effects that: set up digital display host computer and return to zero, with two L type frame suits on the trunk of trees, it is fixed to use the connecting pin to peg graft two L type frames, two ring rail butt joint become complete rings, operate a plurality of fixture, make a plurality of fixture centre gripping trunks, adjust the length of two gauges, make two gauges contact with the both ends of trunk respectively, the operation railcar rotates a week along two ring rails, the railcar rotates a week around the trunk promptly, the continuous extension of change of trunk diameter is followed to pivoted in-process measuring arm under the effect of two gauges, the digital display host computer is data real-time recording, the maximum value of trunk diameter is selected to final digital display host computer, minimum and mean value, the measurement process is quick light, the measuring result deviation is little, the accuracy is high.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic structural view of the L-shaped frame, the clamping mechanism and the ring rail in an open state;

FIG. 4 is a schematic structural diagram of a rail car, a digital display host, a measuring arm and a measuring jaw;

in the drawings, the reference numbers: 1. an L-shaped frame; 2. a connecting pin; 3. a clamping mechanism; 4. a circular rail; 5. a rail car; 6. a digital display host; 7. a measuring arm; 8. measuring jaws; 9. a threaded rod; 10. screwing the handle; 11. a threaded sleeve; 12. clamping the arc plate; 13. a friction block; 14. a lower plate; 15. an upper plate; 16. A rail wheel; 17. a push handle; 18. measuring the arm support; 19. a measuring arm sliding sleeve; 20. a telescopic measuring arm; 21. a measuring jaw sliding sleeve; 22. a measuring jaw square sliding tube; 23. a measuring jaw head; 24. a roller; 25. a level gauge.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

A mathematical measuring instrument comprises two L-shaped frames 1, a connecting pin 2, a plurality of clamping mechanisms 3 and two ring rails 4, the device comprises a rail car 5, a digital display host 6, a measuring arm 7 and two measuring claws 8, wherein one ends of two L-shaped frames 1 are rotatably connected through a pin shaft, the other ends of the two L-shaped frames 1 are fixedly inserted through a connecting pin 2, the L-shaped frames 1 are provided with two arm plates which are perpendicular to each other, clamping mechanisms 3 are respectively installed on the arm plates of the two L-shaped frames 1, two ring rails 4 are respectively installed on the two L-shaped frames 1 through supports, two ends of the two ring rails 4 are butted, so that the two ring rails 4 form a circular ring, the rail car 5 is installed on the two ring rails 4 in a rolling manner, the digital display host 6 is installed on the rail car 5 through supports, the measuring arm 7 is installed on the supports of the digital display host 6 in a sliding manner, the digital display host 6 reads a grating scale value of the measuring arm 7, and the two measuring claws 8 are respectively installed at two ends of the measuring arm 7 in a sliding manner; set up digital display host computer 6 and return to zero, 1 suit is on the trunk of trees with two L type framves, it is fixed with 1 grafting of two L type framves to use connecting pin 2, two ring rails 4 dock into complete rings, operate a plurality of fixture 3, make a plurality of fixture 3 grasp the trunk, adjust the length of two measuring claws 8, make two measuring claws 8 contact with the both ends of trunk respectively, operation railcar 5 rotates a week along two ring rails 4, railcar 5 rotates a week around the trunk promptly, pivoted in-process measuring arm 7 is the continuous extension of change of following the trunk diameter under the effect of two measuring claws 8 and is shortened, digital display host computer 6 takes notes data real-time, the maximum value of trunk diameter is selected to final digital display host computer 6, minimum and mean value, measuring process is quick light, the measuring result deviation is little, the accuracy is high.

Example 2

A mathematical measuring instrument comprises two L-shaped frames 1, a connecting pin 2, a plurality of clamping mechanisms 3 and two ring rails 4, the device comprises a rail car 5, a digital display host 6, a measuring arm 7 and two measuring claws 8, wherein one ends of two L-shaped frames 1 are rotatably connected through a pin shaft, the other ends of the two L-shaped frames 1 are fixedly inserted through connecting pins 2, the L-shaped frames 1 are provided with two arm plates which are perpendicular to each other, clamping mechanisms 3 are respectively arranged on the arm plates of the two L-shaped frames 1, two ring rails 4 are respectively arranged on the two L-shaped frames 1 through supports, the two ends of the two ring rails 4 are butted, so that the two ring rails 4 form a ring, the rail car 5 is arranged on the two ring rails 4 in a rolling manner, the digital display host 6 is arranged on the rail car 5 through supports, the measuring arm 7 is arranged on the supports of the digital display host 6 in a sliding manner, the digital display host 6 reads a grating scale value of the measuring arm 7, and the two measuring claws 8 are respectively arranged at the two ends of the measuring arm 7 in a sliding manner; the clamping mechanism 3 further comprises a threaded rod 9, a screwing handle 10, a threaded sleeve 11, a clamping arc plate 12 and a friction block 13, the screwing handle 10 is installed at the outer end of the threaded rod 9, through holes are formed in the middle of the arm plates of the L-shaped frame 1, the threaded sleeve 11 is installed on the through holes of the arm plates of the L-shaped frame 1, the threaded rod 9 is in rotary threaded connection with the threaded sleeve 11, the inner end of the threaded rod 9 is in rotary connection with the outer wall of the clamping arc plate 12, the clamping arc plate 12 is located on the inner side of the L-shaped frame 1, and the friction block 13 is arranged inside the clamping arc plate 12; the rail car 5 further comprises two lower plates 14, an upper plate 15, a plurality of rail wheels 16, a push handle 17 and a measuring arm support 18, the two lower plates 14 are respectively located on the inner side and the outer side of the lower portion of the circular rail 4, the upper plate 15 is located above the circular rail 4, two ends of the digital display main machines 6 are respectively connected with the two lower plates 14 and the upper plate 15 in a rotating mode, and the rail wheels 16 are located on the inner side and the outer side of the circular rail 4. A plurality of track wheels 16 are connected with the ring rail 4 in a rolling manner, one end of a push handle 17 is connected with the outer walls of the upper plate 15 and the lower plate 14 through a connecting seat, a measuring arm support 18 is arranged on the upper end surface of the upper plate 15, and a digital display host 6 is arranged on the measuring arm support 18; the device further comprises two gradienters 25, wherein the two gradienters 25 are respectively arranged on the two L-shaped frames 1, and the two gradienters 25 are vertically arranged; through screwing 10 rotation threaded rod 9, make threaded rod 9 promote centre gripping arc board 12 centre gripping on the trunk under the effect of thread bush 11, can the trunk of different diameters of centre gripping, finely tune the height of two L type framves 1, make two spirit levels 25 be the horizontality, make two L type framves 1 be in same horizontal plane, and then make whole measurement interface be in same horizontal plane, 16 roll mountings of a plurality of rail wheels are on ring rail 4, make the operation push away 17 can follow ring rail 4 and promote digital display host computer 6 and rotate around the trunk, make surveying work light convenient, improve measuring accuracy.

Example 3

A mathematical measuring instrument comprises two L-shaped frames 1, a connecting pin 2, a plurality of clamping mechanisms 3 and two ring rails 4, the device comprises a rail car 5, a digital display host 6, a measuring arm 7 and two measuring claws 8, wherein one ends of two L-shaped frames 1 are rotatably connected through a pin shaft, the other ends of the two L-shaped frames 1 are fixedly inserted through a connecting pin 2, the L-shaped frames 1 are provided with two arm plates which are perpendicular to each other, clamping mechanisms 3 are respectively installed on the arm plates of the two L-shaped frames 1, two ring rails 4 are respectively installed on the two L-shaped frames 1 through supports, two ends of the two ring rails 4 are butted, so that the two ring rails 4 form a circular ring, the rail car 5 is installed on the two ring rails 4 in a rolling manner, the digital display host 6 is installed on the rail car 5 through supports, the measuring arm 7 is installed on the supports of the digital display host 6 in a sliding manner, the digital display host 6 reads a grating scale value of the measuring arm 7, and the two measuring claws 8 are respectively installed at two ends of the measuring arm 7 in a sliding manner; the measuring arm 7 further comprises a measuring arm sliding sleeve 19, a telescopic measuring arm 20 and a measuring jaw sliding sleeve 21, the measuring arm sliding sleeve 19 is slidably mounted in the measuring arm frame 18, the telescopic measuring arm 20 is slidably mounted in the measuring arm sliding sleeve 19, a tension spring is arranged inside the telescopic measuring arm 20, a grating is arranged on the side wall of the telescopic measuring arm 20, the digital display host 6 reads and records a grating scale value of the telescopic measuring arm 20, two measuring jaw sliding sleeves 21 are respectively mounted at two ends of the telescopic measuring arm 20, the two measuring jaws 8 are slidably mounted in the two measuring jaw sliding sleeves 21, and the two measuring jaw sliding sleeves 21 are both perpendicular to the telescopic measuring arm 20; the measuring jaw 8 further comprises a measuring jaw square sliding pipe 22, a measuring jaw head 23 and a plurality of rollers 24, the measuring jaw square sliding pipe 22 is slidably mounted in the measuring jaw sliding sleeve 21, the measuring jaw head 23 is slidably mounted in the measuring jaw square sliding pipe 22, the plurality of rollers 24 are respectively rotatably mounted on the upper side and the lower side of the outer end of the measuring jaw head 23, and the plurality of rollers 24 are all located on the inner side of the measuring jaw head 23; the installation relative position of measurement claw side slide pipe 22 and measurement claw side slide pipe 21 is adjusted according to the diameter of trunk, a plurality of gyro wheels 24 of trunk both sides all with trunk surface in close contact with, rotate the relative position of the change real-time change volume claw head 23 of measuring two measuring jaw heads 23 follow trunk and measurement claw side slide pipe 22 of measuring, cooperate the extension spring in the flexible measuring arm 20, make a plurality of gyro wheels 24 contact with the trunk all the time, flexible measuring arm 20 follows the continuous flexible change of diameter change of trunk, digital display host computer 6 reads and takes notes the measuring value of flexible measuring arm 20 in real time, measuring arm slide pipe 19 follows the trunk diameter change and constantly removes in measuring cantilever crane 18 simultaneously, reduce the deformation that the horizontal external force that flexible measuring arm 20 received caused, and the measurement accuracy is improved.

As shown in fig. 1 to 4, in the operation of the mathematical measurement instrument of the present invention, firstly, the digital display main unit 6 is reset to zero, the two L-shaped frames 1 are sleeved on the trunk of the tree, the two L-shaped frames 1 are inserted and fixed by using the connecting pin 2, the two ring rails 4 are butted into a complete ring, the plurality of clamping mechanisms 3 are operated to clamp the trunk by the plurality of clamping mechanisms 3, the height of the two L-shaped frames 1 is finely adjusted to make the two gradienters 25 in a horizontal state, then the relative positions of the two measuring claw square sliding tubes 22 and the two measuring claw sliding sleeves 21 are adjusted to make the plurality of rollers 24 respectively contact with the two ends of the trunk, then the track car 5 is pushed by the push handle 17 to rotate for a circle along the two ring rails 4, that is the track car 5 rotates for a circle around the trunk, the telescopic measuring arm 20 continuously extends along with the change of the trunk diameter during the rotation, the digital display main unit 6 records the data in real time, and finally, screening out the maximum value, the minimum value and the average value of the trunk diameter by the digital display host 6.

The main functions realized by the utility model are as follows: the diameters of irregular cylinders such as trunks are rapidly measured, the deviation of the measurement result is small, and the accuracy is high.

The mathematical measurement instrument has the advantages that the installation mode, the connection mode or the arrangement mode are common mechanical modes, and the mathematical measurement instrument can be implemented as long as the beneficial effects of the mathematical measurement instrument can be achieved; the digital display main machine 6, the track wheel 16, the ring rail 4, the roller 24 and the telescopic measuring arm 20 of the mathematical measurement instrument are purchased from the market, and the technical personnel in the industry only need to install and operate according to the attached operating instructions without creative labor of the technical personnel in the field.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The mathematical measuring instrument is characterized by comprising two L-shaped frames (1), a connecting pin (2), a plurality of clamping mechanisms (3), two ring rails (4), a track car (5), a digital display host (6), a measuring arm (7) and two measuring claws (8), wherein one ends of the two L-shaped frames (1) are rotatably connected through pin shafts, the other ends of the two L-shaped frames (1) are fixedly inserted through the connecting pin (2), the L-shaped frames (1) are provided with two arm plates which are perpendicular to each other, the clamping mechanisms (3) are respectively arranged on the arm plates of the two L-shaped frames (1), the two ring rails (4) are respectively arranged on the two L-shaped frames (1) through brackets, the two ends of the two ring rails (4) are butted to enable the two ring rails (4) to form a ring, the track car (5) is arranged on the two ring rails (4) in a rolling manner, the digital display host (6) is arranged on the track car (5) through brackets, the measuring arm (7) is slidably mounted on a support of the digital display host (6), the digital display host (6) reads a grating scale value of the measuring arm (7), and the two measuring claws (8) are respectively slidably mounted at two ends of the two measuring arms (7).

2. The mathematical measurement instrument as set forth in claim 1, characterized in that the clamping mechanism (3) further comprises a threaded rod (9), a tightening handle (10), a threaded sleeve (11), a clamping arc plate (12) and a friction block (13), the tightening handle (10) is mounted at the outer end of the threaded rod (9), through holes are formed in the middle of the arm plates of the L-shaped frame (1), the threaded sleeve (11) is mounted on the through holes of the arm plates of the L-shaped frame (1), the threaded rod (9) is rotatably screwed with the threaded sleeve (11), the inner end of the threaded rod (9) is rotatably connected with the outer wall of the clamping arc plate (12), the clamping arc plate (12) is located on the inner side of the L-shaped frame (1), and the friction block (13) is disposed inside the clamping arc plate (12).

3. The mathematical measurement instrument according to claim 1, wherein the rail car (5) further comprises two lower plates (14), an upper plate (15), a plurality of rail wheels (16), a push handle (17) and a measurement arm support (18), the two lower plates (14) are respectively located at the inner side and the outer side of the lower portion of the circular rail (4), the upper plate (15) is located above the circular rail (4), two ends of the plurality of digital display main machines (6) are respectively rotatably connected with the two lower plates (14) and the upper plate (15), the plurality of rail wheels (16) are located at the inner side and the outer side of the circular rail (4), and a plurality of rail wheels (16) are all in rolling connection with the ring rail (4), one end of a push handle (17) is connected with the outer walls of the upper plate (15) and the lower plate (14) through a connecting seat, a measuring arm support (18) is installed on the upper end face of the upper plate (15), and a digital display host (6) is installed on the measuring arm support (18).

4. The mathematical measurement instrument according to claim 3, wherein the measurement arm (7) further comprises a measurement arm sliding sleeve (19), a telescopic measuring arm (20) and a measuring jaw sliding sleeve (21), the measurement arm sliding sleeve (19) is slidably mounted in the measurement arm support (18), the telescopic measuring arm (20) is slidably mounted in the measurement arm sliding sleeve (19), a tension spring is arranged inside the telescopic measuring arm (20), a grating is arranged on the side wall of the telescopic measuring arm (20), the digital display host (6) reads and records the grating scale value of the telescopic measuring arm (20), two measuring jaw sliding sleeves (21) are respectively mounted at two ends of the telescopic measuring arm (20), two measuring jaws (8) are slidably mounted in the two measuring jaw sliding sleeves (21), and the two measuring jaw sliding sleeves (21) are perpendicular to the telescopic measuring arm (20).

5. The mathematical measuring instrument according to claim 4, wherein the measuring jaw (8) further comprises a measuring jaw square sliding tube (22), a measuring jaw head (23) and a plurality of rollers (24), the measuring jaw square sliding tube (22) is slidably mounted in the measuring jaw sliding sleeve (21), the measuring jaw head (23) is slidably mounted in the measuring jaw square sliding tube (22), the plurality of rollers (24) are rotatably mounted on upper and lower sides of an outer end of the measuring jaw head (23), respectively, and the plurality of rollers (24) are located inside the measuring jaw head (23).

6. A mathematical instrument as claimed in claim 1, further comprising two levels (25), the two levels (25) being mounted on the two L-shaped brackets (1), respectively, the two levels (25) being arranged vertically.

7. The mathematical measuring instrument according to claim 5, wherein the L-shaped frame (1), the lower plate (14), the upper plate (15), the measuring jaw sliding sleeve (21), the measuring jaw square sliding tube (22) and the measuring jaw head (23) are made of aluminum alloy.

Images