Square tube shape lead screw transmission lifting bar
Technical field
The present invention relates to a kind of lead screw transmission lifting bar, particularly related to a kind of vehicle-mounted square tube shape lead screw transmission lifting bar that erects a television antenna that is used for.
Background technique
At present, be used for the vehicle-mounted lifting bar that erects a television antenna, only see pipe shape steel wire traction lifting bar, this lifting bar with 2 wire rope pulley tractions, adopts the manual work mode with number joint tube and pipe of aluminium alloy suit, and its main deficiency is:
When 1, lifting bar is made rising or down maneuver, after a certain height random stops, easily taking place to lower slider and displacement, inconvenience is at lifting bar arbitrary height stable operation.
2, lifting bar in the course of the work, when wire rope interrupted for some reason, the circular Al-alloy pipe of each of body of rod suit very easily caused danger with rapid landing.
3, the outmoded wearing and tearing of wire rope back twisting easily causes lifting stuck and can not work the rate of fault height.
4, but lifting bar descends and to finish by the pressure of loads fully, as then needs press down with manpower when not having heavy duty, and is cumbersome.
5, because the lifting bar appearance is rounded, entrucking is fixing not too convenient.
6, the circular Al-alloy pipe of suit is only fastening up and down with wire rope, and the surplus of left-right rotation is bigger, and is unfavorable to the azimuth stabilization of top antenna.
Goal of the invention of the present invention is to overcome above-mentioned defective, and provides a kind of rate of climb square tube shape lead screw transmission lifting bar fast, safe and reliable and easy and simple to handle.
Summary of the invention
A kind of lead screw transmission lifting bar of the present invention, it comprises: leading screw, the chassis, nut, at least one screw set, at least one positioning block and at least two outer sleeves, leading screw vertically, be sitting on the chassis rotationally, positioning block is fixed on the upper end of outer sleeve, an outer sleeve is sleeved on another outer sleeve with a gap, wherein: the lower end of the lower end of outer sleeve and nut and screw set is fixed together, nut cooperates with the outer surface thread of screw set or leading screw, a screw set is sleeved on a gap with another screw set or leading screw, and described outer sleeve is square.
A kind of lead screw transmission lifting bar of the present invention, wherein: the inwall of the lower end of described outer sleeve is equipped with cover on the nut, steel bushing, nut sleeve and bearing, the profile of cover and nut sleeve is square on the nut, the centre of overlapping on the nut has the inverted T-shaped circular hole, the outer surface that overlaps on the nut is sleeved on the inwall of outer sleeve, fixes by the inwall of screw and outer sleeve; In the inverted T-shaped circular hole that overlaps on the nut steel bushing that matches with the inverted T-shaped circular hole is housed, the cooperation place of the upper end of steel bushing and screw set boss welds together, end in contact on the lower end of steel bushing and the nut is equipped with bearing between them, nut carries out axial restraint by thereon screw and nut sleeve; The following end in contact of overlapping on the upper end of nut sleeve and the nut, the lower end surface of overlapping on the nut is fixed together by the upper-end surface of screw and nut sleeve, have step around the profile of nut sleeve upper end with the wall thickness same thickness of outer sleeve, it is sleeved on the beginning overlapping of two outer sleeves, described step is just in time fixed the end of an outer sleeve, the centre of nut sleeve has circular hole, and steel bushing, bearing and nut are housed in the circular hole.
A kind of lead screw transmission lifting bar of the present invention, wherein: described leading screw is a columniform bar, is with the trapezoidal thread that matches with nut on the excircle of bar, and has the groove of its degree of depth greater than the height of thread of bar excircle at the excircle opposite position.
A kind of lead screw transmission lifting bar of the present invention, wherein: described screw set is a hollow columniform bar, be with the trapezoidal thread that matches with nut on the excircle of bar, and have the groove of its degree of depth greater than the height of thread of bar excircle at the excircle opposite position, screw set is sleeved on the excircle of an end of leading screw or another screw set with a gap, and its inwall has the projection that matches with the groove of leading screw or another screw set.
A kind of lead screw transmission lifting bar of the present invention, wherein: the lift angle θ of described trapezoidal thread is 30 °.
A kind of lead screw transmission lifting bar of the present invention, wherein: 4 hangers are housed on one of described two adjacent positioning blocks.
A kind of lead screw transmission lifting bar of the present invention, wherein: described leading screw by gear train by driven by motor.
A kind of lead screw transmission lifting bar of the present invention, wherein: described leading screw by a pair of angular wheel and handle by manual drives.
A kind of lead screw transmission lifting bar of the present invention, wherein: described leading screw is identical with the quantity of positioning block with the total quantity of screw mandrel cover, is 2-10, and the quantity of outer sleeve is Duoed one than the quantity of positioning block, and outermost outer sleeve is fixed.
A kind of lead screw transmission lifting bar of the present invention, wherein: described outer sleeve and positioning block are made by aluminum alloy, and described screw set is made by the finish rolling steel pipe, and described leading screw is made by round steel.
Compare with existing lifting bar, advantage of the present invention is as follows:
1, easy and simple to handle: its kind of drive adopts electronic or manual two kinds, and when not possessing Power Supplies Condition, the manually-operable by a people can reach the lifting purpose.
2, applied range: both can be used for car antenna and set up, and also can use for the ground fixed station, this lifting bar can be worked under-40 ℃ to 50 ℃ environment.
But 3 arbitrary height work: since less in the design time leading screw lead angle of getting, can accurately guarantee lifting bar in effective travel, be parked in any position and do not produce slide displacement, so work is convenient and reliable.
4, rising or falling speed is fast: this product respectively saves the equal synchronization lifting of moving sleeve pipe lifting, to fall bar on the 15m is example, form with 1 rhizoid thick stick, 5 screw sets and 7 outer sleeves, wherein 6 outer sleeves are active sections, leading screw whenever circles, (decline) 1 pitch that rises, 6 moving sleeve pipes (decline) 6 pitch that can rise.
5, azimuth stabilization is good: product is owing to adopt square tube and screw structure, and design and machining accuracy are higher, make its orientation activity surplus very little, and is highly beneficial to the azimuth stabilization of institute's frame antenna.
6, in light weight, easy to carry: as to consider during design guaranteeing under the prerequisite of intensity that leading screw adopts the finish rolling thin-wall steel tube; Square tube adopts aluminum alloy material, and it is had on certain intensity based, and weight is lighter, and is easy to carry all more convenient with installation.
Description of drawings
Fig. 1 is the forward cross section view of square tube shape lead screw transmission lifting bar of the present invention;
Fig. 2 is the partial schematic diagram of the amplification of the outer sleeve junction in the square tube shape lead screw transmission lifting bar of the present invention;
Fig. 3 (a) is the schematic representation of screw set in the square tube shape lead screw transmission lifting bar of the present invention;
Fig. 3 (b) is the schematic representation of the B-B section of Fig. 3 (a);
Fig. 3 (c) is the schematic representation of the A-A section of Fig. 3 (a);
Fig. 3 (d) is the enlarged diagram of the screw thread among Fig. 3 (a).
Embodiment
With reference to Fig. 1, a kind of lead screw transmission lifting bar of the present invention, it comprises: 8,6 positioning blocks 11 of 3,5 screw sets of 10,6 nuts in 9,1 chassis of 1 leading screw and 7 outer sleeves 4.Each screw set 8, positioning block 11 are different with the size of outer sleeve 4, but structure is roughly the same; Leading screw 9 is sitting on the chassis 10 vertically, rotationally, positioning block 11 is fixed on the upper end of outer sleeve 4, an outer sleeve 4 is sleeved on another outer sleeve 4 with a gap, the lower end of the lower end of outer sleeve 4 and nut 3 and screw set 8 is fixed together, nut 3 cooperates with the outer surface thread of screw set 8 or leading screw 9, a screw set 8 is sleeved on a gap with another screw set 8 or leading screw 9, and described outer sleeve 4 is square.
4 hangers 12 are housed on one of two adjacent positioning blocks 11, be installed with stay cord on the hangers 12, the fixing wire dispenser in stay cord two ends and ground link to each other (not drawing among the figure), when lifting bar rises, along with the rising of lifting bar screw set 8, wire dispenser lengthens wire rope, when lifting bar stops to rise, wire dispenser stops to broadcast wire rope, with being about to the wire rope tension.
Leading screw 9 drives its rotation by gear train 13 by motor 15, and two limit switches (not drawing among the figure) are housed on lift, is used to limit the stroke of lifting bar; Under the condition that does not possess power supply, leading screw 9 also can be by a pair of angular wheel 14 and handle (not drawing among the figure) by its rotation of manual drives, and at this moment spacing can realize that it is spacing by the method that is not provided with screw thread on the screw set 8 at the top of lifting bar.
In order to guarantee the intensity of lead screw transmission lifting bar, alleviate its overall weight simultaneously, outer sleeve is designed to be made by aluminum alloy, and leading screw is designed to be made by steel pipe.
With reference to Fig. 2, the inwall of the lower end of outer sleeve 4 be equipped with overlap 1 on the nut, steel bushing 5, nut sleeve 2, nut 3 and bearing 6.The profile of cover 1 and nut sleeve 2 is square on the nut, the centre of cover 1 has the inverted T-shaped circular hole on the nut, its outer surface is sleeved on the inwall of outer sleeve 4, fixes by the inwall of screw and outer sleeve 4, and the steel bushing 5 that matches with the inverted T-shaped circular hole is housed in the inverted T-shaped circular hole; The cooperation place of the upper end of steel bushing 5 and screw set 8 boss welds together, and end in contact on the lower end of steel bushing 5 and the nut 3 is equipped with bearing 6 between them, and nut 3 carries out axial restraint by thereon screw and nut sleeve 2; The following end in contact of cover 1 on the upper end of nut sleeve 2 and the nut, and together by screw, have step around the nut sleeve 2 upper end profiles with the wall thickness same thickness of outer sleeve 4, it is sleeved on the beginning overlapping of two outer sleeves 4, described step is just in time fixed the end of an outer sleeve 4, the centre of nut sleeve 2 has circular hole, and steel bushing 5, bearing 6 and nut 3 are housed in the circular hole.The size of each bearing 6, steel bushing 5, nut 3 and the screw that matches with each outer sleeve 4 and leading screw 9 or screw set 8 is different, but their structure is identical.
Referring to Fig. 3 a-Fig. 3 d, screw set 8 is hollow cylindrical bars, be with the trapezoidal thread that matches with nut 2 on the excircle of bar, and have the groove 7 of its degree of depth greater than the height of thread of bar excircle at the excircle opposite position, screw set 8 is sleeved on the excircle of an end of leading screw 9 or another screw set 8 with a gap, its inwall has the projection 16 that matches with the groove 7 of a leading screw 9 or another screw set 8, to prevent the rotation between screw set 8 and leading screw 9 or another screw set 9, the lift angle θ of described trapezoidal thread is 30 °.
The profile of leading screw 9 and screw set 8 are roughly the same, and leading screw 9 does not draw separately among the figure.Leading screw 9 is columniform bars, is with the trapezoidal thread that matches with nut 3 on the excircle of bar, and has the groove 7 of its degree of depth greater than the height of thread of bar excircle at the excircle opposite position.The lift angle θ of described trapezoidal thread is 30 °.
Above-mentioned is the description that example is carried out the present invention with 1 leading screw 9 and 5 screw sets 8 only, but the present invention is not limited in this scope.Wherein leading screw 9 is identical with the quantity of positioning block 11 with the total quantity of screw mandrel cover 8, is 2-10, and the quantity of outer sleeve 4 is Duoed one than the quantity of positioning block 11, and wherein outermost outer sleeve 4 is fixed.Except that the sleeve pipe 4 of outermost end, positioning block 11 all is equipped with in each sleeve pipe 4 upper end, is adjacent two sleeve pipes 4 location when up and down.
Working principle of the present invention is as follows:
1. each leading screw and screw set rotate synchronously
Leading screw and screw set are pressed its diameter, be sleeved on successively together, design and processing reach rotation freely; Sliding up and down does not have card and bumps, the inside and the thinnest be leading screw, the boss when it rotates between the dependence screw set and the restriction on leading screw plane drive all screw threads and pay rotation simultaneously.
2. each outer sleeve synchronization lifting
Nut on leading screw and each screw set is contained in the nut sleeve, use bolton, and nut sleeve and the effective bolt of moving sleeve, nut sleeve top is connected with leading screw that matches or screw set lower end again, nut sleeve is connected with the 2nd outer sleeve, and nut sleeve top is connected with first rhizoid thick stick cover.By that analogy, moving sleeve pipe and leading screw or screw set and nut sleeve all are connected firmly, form the interlock body.When being used as lifting action, by hand or motor through gear transmission, the drive leading screw is rotated, because of nut and nut sleeve is fastening and tighten together with outer sleeve, square tube can not be rotated, can only do moving up and down along leading screw, thereby reach leading screw or screw set that each nut drives a rotation, and drive an aluminum alloy outer sleeve and do same up and down moved further.
3. each outer sleeve rising or falling speed is identical
Because the identical and synchronization lifting of every rhizoid thick stick pitch causes the rising or falling speed of every outer sleeve also identical.