CN100513294C - Screw lifter - Google Patents

Abstract

The invention discloses a screw lifter which can convert rotation into straight motion, comprising an upper case, a lower case, a motor, a speed reducer, a bearing, a lead screw and a nut, wherein the upper and lower cases are fixed, the motor via the speed reducer is geared with the lead screw meshed with a nut, the outer wall of the case around the bearing base of the upper and lower cases is in taper shape whose outer wall can be taper face or taper face disposed with bars. The invention has reasonable force on upper and lower cases, with long service life.

Description

Screw elevator

Technical field

The present invention relates to a kind ofly change rotation into straight-line device particularly relevant screw elevator.

Background technology

In existing screw elevator structure, on, the end wall of lower casing is the plane, be that end wall and sidewall intersect vertically, when screw elevator is subjected to a pair of tension, on, lower casing end wall plane will inevitably produce the convex cone distortion, the vertical angle that is end wall and sidewall is widened, like this, because the effect of pulse tensile load, repeated deformation appears at the intersection of casing end wall plane and sidewall, easily cause fatigue cracking, the actual loading test shows, existing screw elevator adopts the zinc alloy casing, and its end wall and sidewall intersect vertically, also promptly have 90 ° of angles on, lower casing, under the pulse tensile load effect of 550kg, behind 20,000 subpulses, on, lower casing will fatigue cracking, and the life-span is short.

Summary of the invention

The object of the present invention is to provide a kind of upper and lower casing stressed rationally, the screw elevator of indefatigability cracking.

In order to achieve the above object, technical scheme of the present invention is: a kind of screw elevator, comprise that upper casing, lower casing, motor, deceleration assembly, clutch shaft bearing, second bearing, third axle hold, screw mandrel and nut, upper casing is captiveed joint with lower casing, motor is in transmission connection by deceleration assembly and screw mandrel, screw mandrel and nut engagement, the outside wall surface of the housing around the bearing seat of upper casing and lower casing is the awl convex.

The outside wall surface of this awl convex can be the awl convex surface, also can be to have convex tendon on the awl convex surface.

After adopting said structure, because the outside wall surface of the housing around the bearing seat of upper casing and lower casing is the awl convex, like this, on, the end wall of lower casing and just have one on every side between the sidewall greater than 90 ° angle, so under the effect of pulse tensile load, the variation at this angle can significantly reduce, and stress concentration reduces, and is stressed reasonable, on, the ability of lower casing antifatigue cracking is greatly improved, by the actual loading test, the present invention is under the pulse tension of load force 550kg, behind 1,200,000 subpulses, on, lower casing is fatigue cracking, these are obviously high a lot of than 20,000 life-spans of prior art, indefatigability cracking in the use, and the life-span is long; Because structure stress is reasonable, also can adopt the low aluminum alloy manufacturing of price, therefore, than adopting the zinc alloy manufacturing cost to reduce greatly.

Description of drawings

Fig. 1 is the structural representation of screw elevator of the present invention;

Fig. 2 is the birds-eye view of Fig. 1;

Fig. 3 is the cutaway view of Fig. 1 along the A-A line;

Fig. 4 is the upper casing structural representation among the present invention;

Fig. 5 is the cutaway view of Fig. 4 along the B-B line;

Fig. 6 is the back view of Fig. 4;

Fig. 7 is the cutaway view of Fig. 6 along the C-C line;

Fig. 8 is the lower casing structural representation among the present invention;

Fig. 9 is the cutaway view of Fig. 8 along the D-D line;

Figure 10 is the back view of Fig. 8;

Figure 11 is the cutaway view of Fig. 8 along the E-E line.

The specific embodiment

The embodiment that provides below in conjunction with accompanying drawing does explanation in further detail to the present invention.

As shown in Figure 1, 2, 3, a kind of screw elevator of the present invention, a kind of screw elevator, comprise that upper casing 1, lower casing 8, motor 13, deceleration assembly, clutch shaft bearing 2, second bearing 3, third axle hold 7, screw mandrel 9 and nut 10, upper casing 1 is captiveed joint with lower casing 8, motor 13 is in transmission connection by deceleration assembly and screw mandrel 9, screw mandrel 9 and nut 10 engagements, and outside wall surface 1-1-1, the 8-1-1 of housing 1-1,8-1 around bearing seat 1-2, the 8-2 of upper casing 1 and lower casing 8 are the awl convex.The outside wall surface 1-1-1 of this awl convex, 8-1-1 are the awl convex surfaces; Certainly, the outside wall surface 1-1-1 of this awl convex, 8-1-1 have convex tendon on the awl convex surface.

Shown in Fig. 1,3,9,10,11,, has reinforced rib 8-5 on the perisporium of the sponson of the bearing seat 8-2 of lower casing 8 in order further to strengthen the intensity of lower casing 8.

Shown in Fig. 4,5,7,8,9,11, in order further to strengthen the intensity of upper casing 1, lower casing 8, the bearing seat 1-2 of upper casing 1 and lower casing 8,8-2 inboard also are connected with reinforced rib 1-3,8-3 respectively.

Shown in Fig. 4,7,8,11, in order to strengthen the intensity of upper casing 1 and lower casing 8 connecting portions, upper casing 1 and lower casing 8 also have screw base 1-4,8-4, and also are connected with reinforced rib 1-3,8-3 respectively on described screw base 1-4, the 8-4.

In order to save cost, upper casing 1 and lower casing 8 adopt aluminum alloy materials to make.Certainly, also can adopt zinc alloy or other material manufacture.

As shown in Figure 1, the deceleration assembly comprises in-line gears 12 that are in transmission connection with motor 13 output shafts and the big gear wheel 6 of captiveing joint with screw mandrel 9, in-line gears 12 and big gear wheel 6 engagements.Certainly, motor 13 output shafts also can pass through alternate manner drive lead screw 9, as adopting Worm and Worm Gear Driving.

Shown in Fig. 1,3, in order to reduce friction, and improve the stressed of bearing seat 1-2,8-2, clutch shaft bearing of being adorned in bearing seat 1-2, the 8-2 of upper casing 1 and lower casing 82 and third axle hold 7 and are plain bearing or antifriction-bearing box, and two second bearings 3 are surface bearing and place inserts 5 both sides of big gear wheel 6 respectively; The lower surface that the upper surface that second bearing 3 of inserts 5 downsides and the third axle of lower house 8 hold 7 flange 7-1 offsets and third axle holds 7 flange 7-1 directly offsets with the upper surface of the bearing seat 8-2 of lower house 8 and/or the lower surface of the bearing seat 1-2 of second bearing 3 of inserts 5 upsides and upper casing 1 directly offsets.

Shown in Fig. 1,3, second bearing 3 is plane rolling bearing or plane sliding bearing.

Shown in Fig. 1,3, the inserts 5 of big gear wheel 6 is captiveed joint with screw mandrel 9 by pin 4; Nut 10 can be captiveed joint with fall way 11, is promptly led by fall way 11 to be driven thing and to move; Nut 10 also can flexibly connect with an end of hinged bar, so that the other end of hinged bar moves.

Shown in Fig. 1,3, course of action of the present invention is as follows: the mounting hole with upper casing 1 and fall way 11 links to each other with external mechanism respectively earlier, when upper casing 1 and fall way 11 were exerted pressure, pressure was successively by fall way 11, nut 10, screw mandrel 9, inserts 5, the second bearings 3 of big gear wheel 6 are delivered on the bearing seat 1-2 of upper casing 1, and the pressure that comes with upper casing 1 outside offsets, this moment the upper casing pressurized, compressive strength is enough; When upper casing 1 and fall way 11 are executed pulling force, pulling force is successively by fall way 11, nut 10, screw mandrel 9, the inserts 5 of big gear wheel 6, second bearing 3, third axle hold 7 and are delivered on the bearing seat 8-2 of lower casing 8, upper casing 1 also is subjected to pulling force simultaneously, upper casing 1 and lower casing 8 all be subjected to action of pulling stress because outside wall surface 1-1-1, the 8-1-1 of housing 1-1,8-1 around bearing seat 1-2, the 8-2 of upper casing 1 and lower casing 8 are the awl convex.Like this, outside wall surface 1-1-1, the 8-1-1 of housing 1-1,8-1 around bearing seat 1-2, the 8-2 and on every side sidewall intersection stress concentration reduce, tensile stress can smoothly be delivered on the sidewall on every side of upper casing 1 and lower casing 8, stressed by the attaching screw between upper casing 1 and the lower casing 8 again, stressed reasonable, indefatigability, cracking.

Claims (10)

1, a kind of screw elevator, comprise that upper casing (1), lower casing (8), motor (13), deceleration assembly, clutch shaft bearing (2), second bearing (3), third axle hold (7), screw mandrel (9) and nut (10), upper casing (1) is captiveed joint with lower casing (8), motor (13) is in transmission connection by deceleration assembly and screw mandrel (9), screw mandrel (9) and nut (10) engagement, it is characterized in that: the outside wall surface (1-1-1,8-1-1) of the bearing seat (1-2,8-2) of upper casing (1) and lower casing (8) housing (1-1,8-1) on every side is the awl convex.

2, screw elevator according to claim 1 is characterized in that: the outside wall surface of this awl convex (1-1-1,8-1-1) is the awl convex surface.

3, screw elevator according to claim 1 is characterized in that: the outside wall surface of this awl convex (1-1-1,8-1-1) is to have convex tendon on the awl convex surface.

4, screw elevator according to claim 1 is characterized in that: have reinforced rib (8-5) on the perisporium of the sponson of the bearing seat (8-2) of lower casing (8).

5, screw elevator according to claim 1 is characterized in that: bearing seat (1-2, the 8-2) inboard of upper casing (1) and lower casing (8) also is connected with reinforced rib (1-3,8-3) respectively.

6, screw elevator according to claim 1 is characterized in that: upper casing (1) and lower casing (8) also have screw base (1-4,8-4), and also are connected with reinforced rib (1-3,8-3) respectively on the described screw base (1-4,8-4).

7, according to claim 1 or 2 or 3 or 4 or 5 or 6 described screw elevators, it is characterized in that: upper casing (1) and lower casing (8) adopt aluminum alloy materials to make.

8, screw elevator according to claim 1 is characterized in that: the deceleration assembly comprises in-line gears (12) that are in transmission connection with motor (13) output shaft and the big gear wheel of captiveing joint with screw mandrel (9)

(6), in-line gears (12) and big gear wheel (6) engagement.

9, according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 described screw elevators, it is characterized in that: clutch shaft bearing of being adorned in the bearing seat (1-2,8-2) of upper casing (1) and lower casing (8) (2) and third axle hold (7) and are plain bearing or antifriction-bearing box, and two second bearings (3) are surface bearing and place inserts (5) both sides of big gear wheel (6) respectively; The upper surface of lower surface and the bearing seat (8-2) of lower house (8) that the upper surface that second bearing (3) of inserts (5) downside and the third axle of lower house (8) hold the flange (7-1) of (7) offsets and third axle holds the flange (7-1) of (7) directly offsets and/or the lower surface of the bearing seat (1-2) of second bearing (3) of inserts (5) upside and upper casing (1) directly offsets.

10, screw elevator according to claim 9 is characterized in that: second bearing (3) is plane rolling bearing or plane sliding bearing.

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