CN101408401A

CN101408401A - Parallel measuring instrument

Info

Publication number: CN101408401A
Application number: CNA2008101476382A
Authority: CN
Inventors: 吕国红; 杨学玉
Original assignee: SICHUAN CHANGZHENG MACHINE TOOL GROUP CO Ltd
Current assignee: SICHUAN CHANGZHENG MACHINE TOOL GROUP CO Ltd
Priority date: 2008-11-21
Filing date: 2008-11-21
Publication date: 2009-04-15

Abstract

The invention discloses a parallel measuring device comprising a seat, a measuring seat and a dial gauge. The parallel measuring device is characterized in that a fixing frame and a group of parallel blocks are fixedly arranged on the seat; the group of parallel blocks is provided with a slot; a bracket and a horizontal sliding seat are fixedly arranged on the measuring seat; at least two cardinal axes of different height are arranged on the bracket; a measuring shaft provided with an axial through-groove is arranged in the sliding seat in a sliding manner; a steel wire passes through the slot of the parallel blocks and the through-groove of the measuring shaft to be fixedly connected with the measuring shaft and then the steel wire is wound on the cardinal axes from bottom to top; and two ends of the steel wire are respectively connected with the fixing frame and suspended objects. The pressing head of the dial gauge contacts with the end face of the measuring shaft. The parallel measuring device adopts the constant gravity to pull the steel wire straight as a rigid reference object so as to not only guarantee the required measuring precision, but also reduce the cost; and the operation is easy and the quality of machine tools is enhanced.

Description

Parallel measuring instrument

Technical field

The present invention relates to a kind of parallel measuring instrument, especially for the parallel measuring instrument of the large span guide rail of high-accuracy numerically-controlled machine or machining center.

Background technology

Be widely used at international and domestic machine industry medium-and-large-sized (ultra-large type) high-accuracy numerically-controlled machine or machining center at present, market outlook are wide.But this type of lathe has more bottleneck on manufacturing technology, and one of its crucial difficult point is exactly apart from 3000mm is big with the parallel centering error of upper span, difficulty is big between two bed ways.Present parallel measuring instrument at this type of guide rail, as shown in Figure 1, comprise the rigid body 20 that constitutes by square steel tube, be installed on pedestal 21 on the rigid body 20, measure pedestal 22 and clock gauge 23, measuring pedestal 22 can slide on rigid body 20, and the pressure head of clock gauge 23 contacts with the end face of measuring pedestal 22; During measurement, pedestal 21 is loaded on the slide block of the qualified line rail of linearity, is loaded on the slide block for the treatment of the survey line rail, promote rigid body 20, can measure the depth of parallelism of two line rails by beating of clock gauge 23 pointers with measuring pedestal 22; But because the heavier cost of quality of square steel tube is higher, the deflection deformation of self is bigger, operation easier is bigger simultaneously, the cumulative measurement error is also bigger, with the span is that 3000mm is an example, and error just more than 0.04mm, follows Machine Tool design accuracy requirement gap bigger, be difficult to satisfy request for utilization, reduced product quality significantly.

Summary of the invention

The objective of the invention is to the above-mentioned deficiency at prior art, utilize a kind of parallel measuring instrument, it has, and distortion is little, cost is low, easy to operate, advantage that measuring accuracy is high.

For achieving the above object, parallel measuring instrument of the present invention, comprise pedestal, measure pedestal, clock gauge, it is characterized in that on pedestal, being installed with fixed mount and one group of parallel block, this group parallel block is provided with a clip slot, measuring the slide that is installed with support and level on the pedestal, on support, be provided with two hinges that highly do not wait at least, in slide, be provided with the measurement axis of tape spool slidably to groove, one steel wire passes the clip slot of parallel block, the groove of measurement axis and connect firmly with measurement axis, and be around in from bottom to up on all hinges, be little clearance fit between steel wire two side bus and the clip slot sidewall, the two ends of this steel wire are connected with unsettled weight with fixed mount respectively, and the pressure head of described clock gauge contacts with the end face of measurement axis;

Principle of work of the present invention is: during measurement, pedestal is loaded on the slide block of the qualified basic rack of linearity, is loaded on the slide block of guide rail to be measured measuring pedestal; Steel wire decide under the pulling force effect at weight weighing apparatus, forms a rigidity object of reference, and the measurement axis that connects firmly with steel wire is as the setting reference point; Promote pedestal and measure pedestal, when observing steel wire two side bus when not contacting with the clip slot sidewall, can think that steel wire is vertical with basic rack at this moment, this moment the clock gauge pointer beat can measure this measurement point with respect to the basic rack closest approach apart from difference, thereby determine the depth of parallelism between two guide rails; When observing steel wire two side bus when contacting with the clip slot sidewall, show that this moment steel wire is unacceptable with the verticality of basic rack, need to adjust the position of measurement pedestal, between steel wire two side bus and clip slot sidewall, be clearance fit;

As a further improvement on the present invention, measuring the parallel block that also is installed with one group of strap clamp groove on the pedestal, described steel wire also passes this clip slot; By increasing the observation object of reference, can judge accurately further whether steel wire and basic rack verticality meet the demands;

As a further improvement on the present invention, below weight, be provided with the baffle plate that is the gap setting and connects firmly with it with support; What can prevent that weight from producing when measuring pedestal and move significantly rocks or the weight guide rail of wounding when falling unusually;

In sum, the present invention is by deciding the stretching steel wire of gravity with weighing apparatus, as the rigidity object of reference, cancelled original rigid body, overcome original structure cost height, made difficulty, deflection deformation is big, operating difficulties, the shortcoming of aspects such as error is bigger can guarantee the requirement of measuring accuracy, has reduced cost again, and easy operating has promoted the quality of lathe.

Description of drawings

Fig. 1 is the structural representation of existing parallel measuring instrument.

Fig. 2 is the perspective view of the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further details:

By shown in Figure 2, this parallel measuring instrument, comprise pedestal 1, measure pedestal 4, be fixedly arranged on fixed mount 2 and one group of parallel block 3 on the pedestal 1, be fixedly arranged on one group of parallel block 10 measuring on the pedestal 4, support 7, the slide 5 of level and baffle plate 8, two groups of parallel blocks 3 wherein, 10 are equipped with a clip slot, on support 7, be provided with three hinges 11, in slide 5, be provided with the measurement axis 6 of tape spool slidably to groove, adopt little clearance fit between measurement axis 6 and the slide 5, grinding technique is adopted with slide 5 inwalls in the axle surface, guarantee the linearity of measurement axis 6 and slide 5 relative motions, the influence that reduces friction and produce, one steel wire 12 passes two groups of

parallel blocks

3,10 clip slot, the groove of measurement axis 6 and connect firmly by jackscrew with measurement axis 6, and be around in from bottom to up on all hinges 11, gap between 12 liang of side bus of steel wire and the clip slot sidewall is set to 0.05mm, one end and the fixed mount 2 of this steel wire 12 connect firmly, the other end is connected with unsettled counterweight 9 as weight by pendant, the pressure head 13 of one clock gauge contacts with the end face of measurement axis 6, baffle plate 8 be arranged on counterweight 9 the below and with its maintenance gap;

During measurement, pedestal 1 is loaded on the slide block of the qualified basic rack of linearity, is loaded on the slide block of guide rail to be measured, on the slotted line rail, set the measurement point of some equidistant correspondences measuring pedestal 4; Steel wire 12 is decided under the pulling force effect at counterweight 9 weighing apparatuses, forms a rigidity object of reference, sets reference point with measurement axis 6 conducts that steel wire 12 connects firmly; Mobile foundation 1, measure pedestal 4, when measurement point, making the gap between 12 liang of side bus of steel wire and the two clip slot sidewalls is about 0.05mm, can think that steel wire 12 is vertical with basic rack at this moment, this moment the clock gauge pointer beat can measure this measurement point with respect to the basic rack closest approach apart from difference, read the value X1 of each point, X2, X3...Xn, relatively draw the Xmax-Xmin value according to each value, it is exactly the parallel difference of two guide rails, the depth of parallelism of tested guide rail can be in time adjusted in assembling according to the difference of measuring, thereby the value error control of guaranteeing measured value and absolute closest approach is at 0.002mm;

When 12 liang of side bus of steel wire contact with two clip slot sidewalls, show that steel wire 12 is unacceptable with the verticality of basic rack at this moment, need to adjust the position of measuring pedestal 4, between 12 liang of side bus of steel wire and clip slot sidewall, be clearance fit; Just in case steel wire 12 fractures, baffle plate 8 break guide rail in the time of can preventing counterweight 9 tenesmus.

Claims

1. parallel measuring instrument, comprise pedestal, measure pedestal, clock gauge, it is characterized in that on pedestal, being installed with fixed mount and one group of parallel block, this group parallel block is provided with a clip slot, measuring the slide that is installed with support and level on the pedestal, on support, be provided with two hinges that highly do not wait at least, in slide, be provided with the measurement axis of tape spool slidably to groove, one steel wire passes the clip slot of parallel block, the groove of measurement axis and connect firmly with measurement axis, and be around in from bottom to up on all hinges, the two ends of this steel wire are connected with unsettled weight with fixed mount respectively, and the pressure head of described clock gauge contacts with the end face of measurement axis.

2. parallel measuring instrument as claimed in claim 1 is characterized in that the parallel block that also is installed with one group of strap clamp groove on the pedestal measuring, and described steel wire also passes this clip slot.

3. parallel measuring instrument as claimed in claim 1 or 2 is characterized in that being provided with the baffle plate that is the gap setting and connects firmly with support with it below weight.