CN1283403C - Single shaft double eccentric asymmetric rolling shearing machine - Google Patents

Abstract

The invention belongs to the technical field of steel rolling machinery auxiliary equipment, and in particular relates to a technical improvement of the installation position of a crankshaft in a rolling steel plate shearing machine. The single-axis double-eccentric asymmetric rolling shear includes a frame, a left and right crank linkage mechanism mounted on the crankshaft, and an arc upper shear blade mounted on the upper knife rest, and the lower shear blade is mounted on the lower blade table. The center line 0 ₂ -0 ₂ of the two cranks installed on the crankshaft is relative to the frame center line 0 ₁ -0 _1. The offset distance OS is calculated according to the formula OS=L ₃ sin(90°-β), where β is asymmetric The angle between the connecting rod and the horizontal plane; L ₃ the length of the connecting rod. For different tie rod parameter values β, L ₃ , the offset distance OS is 20-100 mm. Compared with the prior art, the moving track of the circular arc shearing edge of the present invention is closer to pure rolling, the overall force of the shearing machine is more reasonable, the torque of the entire shearing mechanism is reduced compared with the original one, and the shearing quality of the steel plate is greatly improved. Tool life is also greatly extended.

Description

Single shaft double eccentric asymmetric rolling shear

technical field

The invention belongs to the technical field of steel rolling machinery auxiliary equipment, and in particular relates to a technical improvement of the installation position of a crankshaft in a rolling steel plate shearing machine.

Background technique

In the prior art, there are two schemes for the cut-to-length shearing machine adopting the rolling shearing main drive: one is a double-shaft double-eccentric type, and the other is a single-shaft double-eccentric type. The so-called dual-axis double-eccentric type means that there are two main transmission shafts, and the axis of the transmission shaft and the cutting edge are vertical, and there is an eccentricity on each shaft, so it is called a dual-axis double-eccentric type. The fixed-length rolling shears designed abroad are all in this form. The single-axis double eccentric type has only one main drive shaft, and the two crankshafts of the main drive shaft are symmetrical to the center line of the frame. Since the circular arc cutting edge performs pure rolling, this structure makes the force on the cutting edge uneven, which greatly shortens the service life of the tool and reduces the cutting quality.

Contents of the invention

Aiming at the technical problems existing in the prior art, the present invention provides a single-axis double-eccentric non-shearing machine which improves the shearing condition of the arc shear blade, reduces the shear force, improves the service life of the arc shear blade, and improves the shear quality. Symmetrical rolling shears.

The present invention is realized through the following scheme. The uniaxial double eccentric asymmetric rolling shearing machine includes a frame, a left and right crank linkage mechanism mounted on the frame, and an arc upper cutting edge mounted on the upper tool rest. The lower cutting edge is mounted on the lower blade table, and the characteristic is that the center line O ₂ -O ₂ of the two cranks mounted on the crankshaft is offset from the center line O ₁ -O ₁ of the frame with an offset distance OS of 20-100mm.

The offset distance OS of the present invention is calculated by the following formula:

OS＝L ₃ sin(90°-β)

In the formula: β—the angle between the asymmetrical front link and the horizontal plane;

L ₃ ——the length of the connecting rod;

β = 90° - arcsin (OS/L ₃ ).

The centerlines of the two cranks on the rotary shaft of the existing single-axis double eccentric rolling shear coincide with the centerline of the frame, that is, the two cranks are symmetrically distributed on both sides of the centerline of the frame. In the present invention, the center lines O ₂ -O ₂ of the two cranks are horizontally shifted by a distance OS (not on the same side as the pull rod), that is, the center lines O ₂ -O ₂ of the two cranks are separated from the center line O ₁ -O ₁ of the frame by OS, Forming an asymmetric structure with the center line of the frame, it is called a uniaxial double eccentric asymmetric rolling shear, which is characterized by being able to make the stress condition good and the steel plate shearing quality significantly improved.

Advantage of the present invention and beneficial effect are:

The movement track of the circular arc cutting edge of the present invention is closer to pure rolling, the overall force of the shearing machine is more reasonable, the torque of the entire shearing mechanism is reduced compared with the original one, the cutting quality of the steel plate is greatly improved, and the tool life is also greatly extended .

Description of drawings

Figure 1 is a structural diagram of a uniaxial double eccentric asymmetrical rolling shear

Figure 2 is an analysis diagram of the offset distance OS in a uniaxial double eccentric asymmetrical rolling shear

In the figure: 1-arc upper shear blade, 2-upper tool holder, 3-right hinge, 4-big gear, 5-right connecting rod, 6-right crank, 7-crankshaft, 8-beam, 9-left crank , 10-left connecting rod, 11-frame, 12-left hinge, 13-flexible horizontal tie rod, 14-steel plate, 15-lower cutting edge, 16-lower cutting edge

O ₁ -O ₁ : frame centerline, O ₂ -O ₂ : left and right crank centerlines, OS: offset distance.

Detailed ways

The embodiment will be further described according to the accompanying drawings. This embodiment is used to illustrate the present invention, but not to limit the present invention.

The present invention takes a large-scale rolling shear designed by a steel company as an example, and adopts a single-axis double-eccentric asymmetric structure. The shear force is 850KN, and the shear steel plate size is 40×2700×6000～120000. 15 cuts per minute.

Single-axis double-eccentric asymmetrical rolling shearing machine is composed of a frame 11, an arc upper cutting edge 1, a lower cutting edge 15, and a crank connecting rod mechanism. 3 and the left hinge 12 are installed on the upper tool rest 2, the upper end of the left connecting rod 10 is connected with the left crank 9, the lower end is connected with the left hinge 12, the upper end of the right connecting rod 5 is connected with the right crank 6, and the lower end is connected with the right hinge 3 , the crankshaft 7 is installed in the bearing hole on the frame 11, and the large gear 4 is installed on the right end of the crankshaft 7. When the crankshaft 7 is installed, the centerlines O ₂ -O ₂ of the two cranks 6 and 9 are relative to the frame centerline O ₁ The offset distance OS of -O ₁ is 61.12mm, forming an asymmetric structure with the center line O ₁ -O ₁ of the frame. The minimum offset distance between the two centerlines is 20mm, and the maximum offset distance is 100mm.

The offset distance OS is calculated as shown in Figure 2, and the connecting rod of the rolling shear machine works before and after asymmetry. Before the asymmetry, when it is in the maximum shear state, the connecting rod ad forms an angle β with the horizontal plane, and the force exerted by the crankshaft on the connecting rod cannot be used for shearing, and the efficiency is very low; after the asymmetry, when it is in the maximum shear state, The connecting rod a'd is perpendicular to the horizontal plane, and the force of the connecting rod is almost entirely used for shearing.

d——the pivot point of the connecting rod and the upper shear frame;

a——is the pivot point of the asymmetrical front crankshaft and connecting rod;

a'——is the fulcrum of the asymmetrical rear crankshaft and connecting rod;

β——is the angle between the asymmetrical connecting rod and the horizontal plane;

L ₃ ——the length of the connecting rod;

ad, a'd - connecting rod;

F1——the force acting on the steel plate before the structure is asymmetric;

F2——the force acting on the steel plate after the structure is asymmetric;

F - the force on the connecting rod.

β＝90°-arcsin(OS/L ₃ )

F ₁ =F

F ₂ =F/cos(90-β)

aa'=2·L ₃ sin((90°-β)/2), dh'=L ₃ ·cos((90°-β)/2)

And because aa′·dh′=L ₃ ·ah, so, ah=aa′·dh′/L ₃

os=ah

os=aa′·dh′/L ₃ ＝L ₃ sin(90°-β) that is

The asymmetric offset is: os=L ₃ sin(90°-β)

Substitute the known parameter β=87.5°, L ₃ =1400mm

Therefore, the obtained asymmetric offset is: OS=L ₃ sin(90°-β)=61.12mm. Among them, according to the different values of parameters β and _L3 , the minimum offset distance between the two centerlines is 20mm, and the maximum offset distance is 100mm.

During the cutting operation, the large gear 4 transmits the power to the crankshaft 7, and the rotation of the crankshaft 7 drives the left and right cranks 6, 9 with a certain phase difference to rotate together, and the left and right cranks 6, 9 respectively drive the left and right connecting rods 10, 5 and the left and right hinges 12, 3 Drive the upper tool rest 2 to move. The upper shearing edge 1 on which the upper knife rest 2 is installed performs approximately pure rolling under the control of the flexible horizontal pull rod 13, and completes the shearing of the steel plate 14 together with the lower shearing edge 15.

Claims (2)

1, the asymmetric rolling shearing machine of a kind of single shaft double eccentric, include frame (11), with be contained in the left and right sides toggle on the bent axle and be contained in circular arc upper scissor blade (1) on the upper tool post (2), lower scissor blade (15) is contained on the lower blade station (16), it is characterized in that being contained in two cranks (6) and (9) center line O on the bent axle (7) ₂-O ₂With respect to frame central line O ₁-O ₁Offset distance 0S calculates by following formula:

OS＝L ₃sin(90°-β)

In the formula:

β---be asymmetric connecting rod and horizontal plane angle;

L ₃---length of connecting rod;

2, the asymmetric rolling shearing machine of single shaft double eccentric according to claim 1 is characterized in that for different pull bar parameter value β, L ₃, offset distance OS is 20～100mm.

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