CN105953780B - Prism centering rod - Google Patents

Abstract

The invention discloses a kind of prism centering rod, including bottom be provided with the outer tube of base cone and be set in outer tube and can in the axially adjustable inner tube of outer tube, in addition to：Prism connector；Centering component；Annular gap is formed between auxiliary section and axial hole；Resistance strain gage；Sample drive circuit；Process circuit；Output circuit.The present invention facilitates the vertical adjustment of prism centering rod, and need not frequently correct for tilt errors.

Description

Prism centering rod

Technical field

The present invention relates to a kind of prism centering rod, it is however generally that, prism centering rod abbreviation centering rod, also known as prism bar.

Background technology

Typically, such as Chinese patent literature CN104061919A, it discloses a kind of typical case's knot of existing prism centering rod Structure, it needs the centering rod set by vertically (vertical) when there is one to use, to make centering rod stable and reliable In vertical state, a pair of support rods is configured for it again, two support bars combine foot stool in splayed, then connected by connector It is connected on centering rod, to form effective Auxiliary support to centering rod.

Whether vertical centering rod bar is very useful in installation prism, its state matter that will directly affect measurement accuracy and mapping product Amount.In general, the lower end of the prism centering rod of single pole structure (such as Chinese patent literature CN104482927A) is tip, use In penetrating in soil, its state is less likely to occur to change after setting.As it was previously stated, in order that it keeps vertical state, and match somebody with somebody for it Splay foot stool is put, also for the state change avoided after setting up.However, tip, foot stool, are slightly being touched Hit, or stress in operating process, it can cause its state that slight change occurs, although it is not special to be influenceed on measurement accuracy Greatly, but can have an impact after all.Especially, this slight influence is not often paid attention to by operator.

Mirror end typically sets spirit level, is adjusted for the horizontalization at mirror end.Used spirit level is usually circle level gas Bubble, or two cylinder level(l)ing bubbles of orthogonal setting, by flattening level(l)ing bubble, indicate centering rod vertical.

Although level(l)ing bubble is cheap, accurate level(l)ing bubble is from 30 yuan~50 yuan relatively, and easy level(l)ing bubble is only Have less than a yuan, but its intuitive and bad, the relative difficulty that adjustment needs experience and become, especially in use, Mirror end personnel are not easy to notice the state change of level(l)ing bubble, so as to draw accurate measurement data.

In addition, such as round level bubble, it is fixed on usually using three screws on centering rod, due to the original such as carrying, colliding Cause, it is easy to the asymmetric loosening of screw is produced, or micro bending that centering rod is autologous (prism centering rod specification is more, from 1.25 meters to 5 meters or the prism bar with stretching structure, draw ratio is bigger, and deformation is inevitable), it is necessary to circle level gas Bubble is flattened again, that is, needs to eliminate centering rod heeling error.The heeling error removing method of prism centering rod is very at present Trouble, in other words, although round level bubble is cheap, because error concealment is cumbersome, can increase unnecessary maintenance cost, Cause overall use cost higher.

The content of the invention

In view of this, it is an object of the invention to provide a kind of convenience to adjust vertically, and need not frequently correct inclination and miss The prism centering rod of difference.

The present invention uses following technical scheme：

A kind of prism centering rod, including bottom are provided with the outer tube of base cone and are set in outer tube and can axially be adjusted in outer tube Whole inner tube, in addition to：

Prism connector, bottom is connected to the upper end of inner tube, and the upper end of the prism connector is formed with for prism table The assembling structure of assembling, and the lower end of the prism connector is provided with the ball-and-socket of spherical hinge, and in the lower end periphery of prism connector Be connected with the support with axial hole, wherein axial hole is located at the lower section of ball-and-socket, and with inner tube coaxial line；

Centering component, the centering component include coordinating with the ball-and-socket to form the bulb of spherical hinge, be connected to bulb simultaneously The auxiliary section for extending downwardly and coordinating with the axial hole, and be connected to auxiliary section lower end and extend further downward to connect The connecting rod of weight；Wherein annular gap is formed between auxiliary section and axial hole；

Resistance strain gage, totally four, and annular array is in the circumference of the annular gap, and in the radial direction of the axial hole electricity The thickness for hindering foil gauge is the gap width of annular gap；

Drive circuit is sampled, connects above-mentioned four sheet resistances foil gauge, there is provided driving power, and the electricity of sampling resistor foil gauge Resistive, generate variable；

Process circuit, the sampling drive circuit is connected, the variable sampled is handled, produces the inclination side of inner tube To；

Output circuit, export so that the incline direction is presented.

Above-mentioned prism centering rod, it is characterised in that four sheet resistance foil gauges form parallel circuit；

Correspondingly, the power circuit of the sampling drive circuit including the parallel circuit and each to parallel circuit Road carries out the current sensor of current sample, the controller with analog input interface of the connection current sensor, with Produce the variable of resistance variations.

Above-mentioned prism centering rod, the auxiliary section are positive four bank or ridge, and correspondingly, the axial hole is square hole, annular gap For square annular.

Above-mentioned prism centering rod, the weight are provided with the second locking hole, accordingly, the position of the second locking hole are corresponded in inner tube Side opening is installed, for realizing the locking of weight under portable state by the cooperation of screw and the second locking hole.

Above-mentioned prism centering rod, the cooperation of inner tube and outer tube contain auxiliary guide frame.

Above-mentioned prism centering rod, the auxiliary guide frame is dovetail groove guide rail structure；

The dovetail groove of the wherein dovetail groove guide rail structure is arranged on the inwall of outer tube；

Outer wall of the dovetail configuration relative set of the dovetail groove guide rail structure in inner tube.

Above-mentioned prism centering rod, the structure that rear locking inner tube is adjusted in place for inner tube are：

The 3rd locking hole is provided with corresponding to the outer tube wall of dovetail groove bottom land；

One bolt with handwheel for being matched with the 3rd locking hole is used as locking member.

Above-mentioned prism centering rod, it is releasable connection between the base cone and the body of inner tube, correspondingly, under the body of inner tube End has connection internal thread, and the upper end of base cone has the connection external screw thread with the connection internal thread connection.

Above-mentioned prism centering rod, the length of the connecting rod is not less than 30cm, and is not more than 50cm.

Above-mentioned prism centering rod, the assembling structure are：

Prism bore of the prism connector formed with axial direction；

The side of prism bore is provided with the first locking hole.

The present invention naturally droops indicated vertical based on weight, is sampled by resistance strain gage, and four resistance should Become piece and be up to two engaged portion extruding, pass through the simple conversion of two orthogonal amounts, you can draw the inclination side of centering rod To so as to which easily centering rod is adjusted in place based on incline direction.It is empty by weight activity after resistance strain gage is configured in place Between limitation, will not be by excessive condensation, and be not easy plastic deformation, from without frequently carrying out error correction, overall makes With cost than relatively low.If two relative resistance strain gages produce variable output, show that at least one of which is problematic, The lookup of its problem is also more convenient.

Brief description of the drawings

Fig. 1 is the incomplete decomposing figure according to a kind of prism centering rod of the present invention.

Fig. 2 is the structural representation that a kind of prism connects first direction.

Fig. 3 is the structural representation that a kind of prism connects first direction.

Fig. 4 is a kind of structural representation of centering component.

Fig. 5 is prism connector and centering assembly connecting structure schematic diagram.

Fig. 6 is a kind of inner tube structure schematic diagram.

Fig. 7 is a kind of outer tube structure schematic diagram.

Fig. 8 is a kind of base cone structural representation.

In figure：1. prism connector, 2. centering components, 3. inner tubes, 4. outer tubes, 5. base cones.

11. the first locking hole, 12. fittings bodies, 13. connection screw threads, 14. ball-and-sockets, 15. supports, 16. inductive heads, 17. resistance Foil gauge, 18. prism bore.

21. bulb, 22. ligands, 23. connecting rods, 24. weights, 25. second locking holes.

31. connect internal thread, 32. dovetail configurations.

41. the 3rd locking hole, 42. dovetail grooves.

Embodiment

The use state of prism centering rod is vertical state, is used in Figure of description 1-8 for the convenience of Butut by it Horizontal or other states, do not influence its in construction on or lower concept use, those skilled in the art should have to this It is expressly understood.

Such as be a kind of dimensional structure diagram of the incomplete decomposing of the horizontal state of prism centering rod in Fig. 1, but bottom Position where cone 5 belong to this area to prism centering rod " under " understanding, and the position where prism connector 1 belongs to ability Domain to prism centering rod " on " understanding.

Prism centering rod generally uses length-adjustable structure, namely what is often called expansion link at present, it is however generally that, it is located below Pipeline section it is thicker, and be configured to the outer tube 4 of expansion link, pipeline section located above is relatively thin, is inserted in the inner tube of outer tube 4, is referred to as Inner tube 3.

The bottom welding of outer tube 4 processes base cone 5, and to provide its stable support, base cone 5 is actually lower end tip General appellation.

For the adjustment structure between inner tube 3 and outer tube 4, generally using the simple nested structure of inner and outer pipes, then pass through Such as the jackscrew locking with handwheel realizes that inner tube 3 is in the locking of the axial location of outer tube 4 after adjusting.

The upper end of prism centering rod is used to install prism, and substantially mounted structure division is referred to as prism assemblies, including Prism and prism table, portable state, prism assemblies need to separate with prism bar.

Therefore, the upper end of prism centering rod should be the assembling structure of prism centering rod and prism assemblies.Shown in Fig. 1 In structure, the assembling structure is configured to prism connector 1, and correspondingly, prism connector 1 should assemble or be welded on inner tube 3 Upper end, in addition, prism connector 1 can also be as the upper end formation part of inner tube 3.

Correspondingly, the upper end of prism connector 1 is formed with the assembling structure assembled for prism table, such as hole axle connection knot Structure, screw connection structure.

To realize the purpose of the present invention, as shown in Fig. 2 the ball-and-socket of spherical hinge is provided with the lower end of the prism connector 1, When using ball pivot chain link following centering component 2, centering component 2 has the attribute of spherical hinge.

And then comparatively, for hinge, obligatory point closer to pin joint, the resistance arm of the obligatory point with regard to smaller, and Bigger closer to pin joint, such as the setting difficulty of following resistance strain gage 17, especially, for plates, its stress is not Balance is bigger, in order to reduce the influence of force unbalance, and is advantageous to the setting of resistance strain gage 17, sets resistance The position of foil gauge 17 should be less than the certain distance of ball-and-socket 14 here, and the distance is more preferably greater than including three times resistance strain gage 17 Width on the axial direction of pipe 3, and width of 8 times of resistance strain gages 17 on the axial direction of inner tube 3 had better not be more than.

Here, it will be understood by those of skill in the art that for prism centering rod, it is common that either utilize tradition Mode carry out the adjustment of vertical or carry out the adjustment of vertical according to the mode of the present invention, all without exception first pass through it is artificial Vertical initially adjust, the verticality error initially adjusted is not too large, such as with vertical into more than 10 degree of angle, it is clear that is It is unpractical.Artificial initial adjustment can substantially ensure the substantially vertical of prism centering rod, the lead typically manually adjusted Error of hanging down, for experienced mirror end operating personnel, does not utilize such as spirit level even within the scope of 5 degree, it is possible to straight Connect and prism centering rod is adjusted to vertical error within 1 degree.

Recognize based on more than, resistance strain gage 17 in use will not be by too big pressure.

Certainly, it is contemplated that prism centering rod is probably to want horizontal to place under portable state, on this condition, it may be considered that right Example centering component 2 described as follows is locked, and avoids making it damage resistance strain gage 17 by pressure.

Compared to traditional prism centering rod, the sensitiveness of resistance strain gage is relatively good, but is also easier to damage, therefore, Need sufficiently to protect resistance strain gage in use.

Therefore, in certain embodiments, the hard-over of centering component 2 can be limited, due to such as inner tube 3, its inner tube Caliber is limited, and the hard-over of centering component 2 is directly limited by the inner tube diameter of inner tube 3, therefore, can set such as weight 24 size, the hard-over of limitation centering component 2, such as hard-over are set in the range of 0.5 degree, it will be appreciated that although The hard-over being defined is smaller, but does not influence the use of the prism centering rod, is, since the gradient of prism centering rod More than 0.5 degree, then the pressure holding to resistance strain gage 17 is exactly maximum rating, will not be big with the change of the gradient of centering rod again Become big again, but can point out that centering rod tilts to which direction, the use without influenceing prism centering rod.

Therefore, in preferred embodiment, weight 24 is more slightly smaller than the diameter of inner pipe of inner tube 3, it is only necessary to by simple meter Calculate, it is possible to it is determined that such as hard-over of centering component 2 is 0.5 degree of required weight 24 and the matching relationship of inner tube 3.

It is thus preferable to centering component 2 limits centering component 2 most by limiting weight 24 with the diameter of inner pipe of inner tube 3 Big corner, with protective resistance foil gauge, the hard-over is defined to 0.5 degree.

Further, the length of the connecting rod 23 is not less than 30cm, and is not more than 50cm, by length amplification, The larger amount of movement for by micro angle change, being amplified to weight 24 is realized, but the length is unsuitable excessive, otherwise can produce ratio Larger pressure, in other words, the arm of force of weight 24 can be long, causes the power that acts on resistance strain gage 17 excessive.Also not Preferably too small, otherwise amplification is very limited.

For the one side of protective resistance foil gauge 17, extend further downward, enter in the lower end of prism connector 1 The part that one step extends downwardly needs to get out of the way the passage of example centering component 2 described as follows, therefore, the part extended further downward Periphery or the side of the lower end of prism connector 1 are arranged on, support 15 as shown in Figure 2, the lower end of support 15 is such as Fig. 2 Shown in inductive head 16, inductive head 16 be used for the resistance strain gage is set.

As shown in Fig. 2 via of the inductive head 16 with an axial direction of inner tube 3, referred to as axial hole in figure, for centering component 2 cooperatively form spherical hinge after passing beneath with the ball-and-socket 14.

Here, axial bore portion is used to set resistance strain gage 17, and positioned at the lower section of ball-and-socket 14, as it was previously stated, under this The distance of side needs to limit, example distance selection as the aforementioned.

Axial hole either circular hole or square hole, are respectively provided with axis, and the axis is identical with the axis of inner tube 3.

In this paper main contents, basic referential is inner tube 3, is that inner tube 3 directly or indirectly connects prism Component, its state directly affect the state of prism, more than outer tube 4, and also there is one-level to be connected for outer tube 4 and inner tube 3 after all, if Based on outer tube 4, then new accumulated error can be produced.

In summary, as shown in figure 4, must be provided for and the ball-and-socket on the centering component 2 its upper end first 14 coordinate to form the bulb 21 of spherical hinge, should also protect and be connected to bulb 21 and extend downwardly and coordinate with the axial hole Auxiliary section, connector bar is additionally provided between ligand 22 as shown in Figure 4, wherein ligand 22 and bulb 21, for producing The distance between foregoing distance, i.e. spherical hinge and resistance strain gage 17.

Certainly, ligand can be with relatively long, and connector bar only realizes connection without long, the presence of connector bar It is also used for avoiding the section of ligand 22 excessive, and influences the laying of spherical hinge.

Further, centering component also includes being connected to the lower end of ligand 22 and extending further downward to connect weight 24 Connecting rod 23.

Wherein annular gap is formed between auxiliary section and axial hole, it will be appreciated that prism pair when forming the state of annular gap Middle bar is in vertical state, is also readily appreciated that by context, it is necessary to set resistance strain gage 17 in annular gap, just necessarily This state be present.

Can be ring gap or square czermak space on annular gap, no matter which kind of configuration state, not shadow Ring the setting of resistance strain gage 17.It is preferred that square czermak space, in the quadrangular structure of inductive head 16 as shown in Figure 2, its with it is right The cooperation of middle component 2 can also constrain the free degree of the spherical hinge around the axis rotation of inner tube 3, so as to be provided for further locking weight 24 Relatively good basis, so as to form the second of protective resistance foil gauge 17 aspect.

It can be realized as previously mentioned, for weight 24 only by the cooperation of weight 24 and inner tube 3, but preferably with auxiliary Structure, such as the second locking hole 25 shown in Fig. 4.

On resistance strain gage 17, itself belong to the element of measuring strain, the change that it will can be strained on mechanical component Be converted to resistance variations.Resistance strain gage is to be coiled into palisade by Φ=0.02-0.05mm constantan wire or nickel filament (or use is very thin Metal foil corrosion into palisade) be clipped in two layers of heat insulating lamella (substrate) and be made.It is connected, is made with foil gauge wire grid with silver-coated copper wire For resistor disc lead.

Resistance strain gage 17 can measure micro strain, therefore, it is necessary to by structure for amplifying, by larger motion transform Into less motion, for example, the weight 24 extended downwardly by connecting rod 23, under the conditions of identical corner, the road of ligand 22 Electrical path length is less than the path length of weight 24.

Moreover, it will be appreciated that power that resistance strain gage 17 can carry and need not be too big, you can have good sound Should, therefore, although having used the concept of weight 24, the representation of concept counterweight is also only used only, to improve to angle of inclination Good response performance.

On the quantity of resistance strain gage 17, four are arranged to, and annular array is in the circumference of the annular gap, and The thickness of the radial direction of the axial hole resistance strain gage 17 be annular gap gap width, in other words, when centering component 2 produce it is non- Vertical state, i.e., it can be pressed onto a piece of or two panels resistance strain gage.

The change in resistance of resistance strain gage 17 and its application are very universal or also highly developed, and one is sampled to it As be voltage sample, and current sample can also be carried out in some applications, when know which sheet resistance foil gauge 17 or which Two panels resistance strain gage 17 produces change in resistance, will very easily determine centering component 2 to which or which both direction Tilt.

In some embodiments, it is only necessary to qualitatively represented, one instruction, example are set for each resistance strain gage Such as electric current instruction, if electric current changes, show its compression.

Quantitative instruction can be carried out in other embodiments, needs to be calculated when carrying out quantitative instruction, compared to Previous embodiment, can be more more complicated but more accurate in structure.

On quantifying, then it is calculated also very simple, when be realised that only a piece of resistance strain gage 17 is pressurized, is necessarily existed Directly determined on predetermined orthogonal direction, without being precisely calculated.

Just needed when there is two panels compression it is accurate calculate, be also very easy to calculate using parallelogram law inclined Specific direction.

In addition, necessarily, resistance strain gage 17 needs drive circuit, in other words, can be straight in some simple applications Connect and be expressed as its power supply power supply.In some somewhat complicated applications, such as voltage-stabilized power supply, current source or voltage can be used During source, especially sampled voltage signal, preferably with voltage source, if current source is then preferred during sampled current signals.

And then for its sampling, it is possible to carry out the sampling of electric current or voltage according to the configuration of the last period, generate electric current Or the variable quantity of voltage, referred to as variable.

Which sheet resistance foil gauge 17 variable quantity of electric current and voltage, which can embody, is pressurized, so as to first qualitatively provide prism The incline direction of centering rod.

For in calculative application, it is necessary to process circuit be set, typically using intelligent device, such as with less defeated Enter the controller of output interface, without using the single-chip microcomputer with compared with multiplex roles.

Analog input is directly used, controller is generally equipped with analog quantity input, without carrying out analog-to-digital conversion, structure Simply.

As it was previously stated, the calculating measured in both direction is fairly simple, it is only necessary to simple parallelogram law, without Complicated algorithm, response speed is also than very fast.

Output after quantization shows as the incline direction of prism centering rod, so as to more intuitively embody, and has Beneficial to the adjustment of mirror station personnel.

Output can be simple analog output, use simple liquid crystal display, outbound course angle.

It is very not smart to required precision in the application of prism centering rod although the precision of resistance strain gage 17 is very high Really, it is therefore preferable that using circuit structure simple in construction, ground is configured, four sheet resistance foil gauges 17 form parallel circuit；

Correspondingly, the power circuit of the sampling drive circuit including the parallel circuit and each to parallel circuit Road carries out the current sensor of current sample, the controller with analog input interface of the connection current sensor, with Produce the variable of resistance variations.

Preferably, the auxiliary section is positive four bank or ridge, as shown in Figure 4, then in this structure, will be formed such as Fig. 5 institutes The fit structure shown, on this condition, spherical hinge are suppressed around the free degree that the axis of inner tube 3 rotates, so as to as shown in Fig. 5 lower ends Weight, the direction of default second locking hole 25 is just determined, so as under portable state, in advance lock weight 24 Gu avoid producing resistance strain gage 17 impact of fatigability, with protective resistance foil gauge 17.

Specifically, the weight 24 is provided with the second locking hole 25, accordingly, the position of the second locking hole 25 is corresponded in inner tube 3 Side opening is installed, for realizing the locking of weight 24 under portable state by the cooperation of screw and the second locking hole 25.

On this condition, the axial hole is square hole, and annular gap is the annular gap in side.

And then in this structure, the placement surface of resistance strain gage 17 is plane, is easily accomplished the peace of resistance strain gage 17 Dress.

It has been recognised by the inventors that the fit structure between traditional inner tube 3 and outer tube 4 is excessively simple, with mill during use Damage, the gap between inner tube 3 and outer tube 4 become big, the especially cooperation between pipe pipe, are very easy to cause asymmetric abrasion, Caused gap can influence the vertical state under prism centering rod use state, be at unstable state.

Therefore, the cooperation of inner tube 3 and outer tube 4 contains auxiliary guide frame, auxiliary is oriented to, will not belong to lead to a certain extent Structure, thus, it can replace in some applications, it is in other words, maintainable relatively good.

Further, the auxiliary guide frame is dovetail groove guide rail structure, and dovetail groove guide rail structure is found in Fig. 6 and figure In 7, dovetail configuration 32 is set in the side of inner tube 3, dovetail groove 42 is set in the corresponding side of outer tube 4.

Dovetail groove guide rail belongs to one of precise guide rail, although needing to lubricate, guide pass is relatively small, it is necessary to the face safeguarded It is small, so as to pay a price it is relatively small under conditions of, can the amount of acquisition be oriented to.

Especially, dovetail groove guide rail even on lathe it is this frequently use guide rail occasion, its service life nor It is often long.

Specifically, wherein, the dovetail groove 42 of the dovetail groove guide rail structure is arranged on the inwall of outer tube 4；

Outer wall of the relative set of dovetail configuration 32 of the dovetail groove guide rail structure in inner tube 3.

Further, the structure for rear locking inner tube 3 being adjusted in place for inner tube 3 is：

Specifically, it is provided with the 3rd locking hole 41 corresponding to the tube wall of outer tube 4 at the bottom of dovetail groove 42；

One bolt with handwheel for being matched with the 3rd locking hole 41 is used as locking member.

The guide pass of dovetail groove guide rail is plane, and locking member is easily set, and in order to reduce locking member to guide pass Damage, can preferably be configured to the plane tight lock part of locking member.

Preferably, it is releasable connection in order to improve maintainability, between the base cone 5 and the body of inner tube 3, correspondingly, The body lower end of inner tube 3 has connection internal thread, and the upper end of base cone has and spiral shell outside the connection of the connection internal thread connection Line.

Preferably, the assembling structure is：

Prism bore 18 of the prism connector 1 formed with axial direction；

The side of prism bore 18 is provided with the first locking hole 11.

Claims (10)

1. a kind of prism centering rod, including bottom is provided with the outer tube (4) of base cone (5) and is set in outer tube (4) and can be outside The inner tube (3) of inner axial tube adjustment, it is characterised in that also include：

Prism connector (1), bottom is connected to the upper end of inner tube (3), and the upper end of the prism connector (1) is formed with for rib The assembling structure of microscope base assembling, and the lower end of the prism connector (1) is provided with the ball-and-socket of spherical hinge, and in prism connector (1) Lower end periphery be connected with the support (15) with axial hole, wherein axial hole is located at the lower section of ball-and-socket, and coaxial with inner tube (3) Line；

Centering component (2), the centering component (2) include coordinating with the ball-and-socket to form the bulb of spherical hinge (21), be connected to Bulb (21) and extend downwardly and with the axial hole coordinate auxiliary section, and be connected to auxiliary section lower end and further downwards Extend to connect the connecting rod of weight (24) (23)；Wherein annular gap is formed between auxiliary section and axial hole；

Resistance strain gage (17), totally four, and annular array is in the circumference of the annular gap, and in the radial direction of the axial hole electricity The thickness for hindering foil gauge (17) is the gap width of annular gap；

Drive circuit is sampled, connects above-mentioned four sheet resistances foil gauge (17), there is provided driving power, and sampling resistor foil gauge (17) Resistance variations, generate variable；

Process circuit, the sampling drive circuit is connected, the variable sampled is handled, produce the inclination side of inner tube (3) To；

Output circuit, export so that the incline direction is presented.

2. prism centering rod according to claim 1, it is characterised in that four sheet resistance foil gauges (17) form electricity in parallel Road；

Correspondingly, the sampling drive circuit includes the power circuit of the parallel circuit and each branch road of parallel circuit is entered Current sensor, the controller with analog input interface of the connection current sensor of row current sample, to produce The variable of resistance variations.

3. prism centering rod according to claim 1 or 2, it is characterised in that the auxiliary section is positive four bank or ridge, accordingly Ground, the axial hole are square hole, and annular gap is side's annular.

4. prism centering rod according to claim 3, it is characterised in that the weight (24) is provided with the second locking hole (25) side opening, accordingly, is provided with corresponding to the position of the second locking hole (25) in inner tube (3), for passing through spiral shell under portable state The locking of weight (24) is realized in the cooperation of nail and the second locking hole (25).

5. prism centering rod according to claim 1, it is characterised in that inner tube (3) and the cooperation of outer tube (4) contain auxiliary Guide frame.

6. prism centering rod according to claim 5, it is characterised in that the auxiliary guide frame is dovetail groove guide rail knot Structure；

The dovetail groove (42) of the wherein dovetail groove guide rail structure is arranged on the inwall of outer tube (4)；

Outer wall of dovetail configuration (32) relative set of the dovetail groove guide rail structure in inner tube (3).

7. prism centering rod according to claim 6, it is characterised in that be adjusted in place rear locking inner tube for inner tube (3) (3) structure is：

The 3rd locking hole (41) is provided with corresponding to outer tube (4) tube wall of dovetail groove (42) bottom land；

One bolt with handwheel for being matched with the 3rd locking hole (41) is used as locking member.

8. prism centering rod according to claim 1, it is characterised in that between the base cone (5) and the body of inner tube (3) For releasable connection, correspondingly, the body lower end of inner tube (3) has connection internal thread, and the upper end of base cone has and the connection The connection external screw thread of internal thread connection.

9. prism centering rod according to claim 1, it is characterised in that the length of the connecting rod (23) is not less than 30cm, and it is not more than 50cm.

10. prism centering rod according to claim 1, it is characterised in that the assembling structure is：

Prism bore (18) of the prism connector (1) formed with axial direction；

The side of prism bore (18) is provided with the first locking hole (11).