CN101788042A - Symmetrical toggle rod pressure transmission mechanism - Google Patents

Abstract

A symmetrical toggle pressure transmission mechanism belongs to the field of connecting rod transmission mechanisms. The toggle pressure transmission mechanism includes a toggle mechanism, a driving block, a slider and a frame. There are two toggle mechanisms, which are symmetrically arranged in the center of the mechanism. Both sides of the axis of the drive rod. Wherein the toggle mechanism includes an upper toggle plate, a lower toggle and an intermediate link. The upper toggle plate is connected to the lower toggle, intermediate link and frame respectively through the toggle hinge, connecting hinge and upper beam hinge, the other end of the lower toggle is connected to the slider through the slider hinge, and the other end of the intermediate link is connected through the drive hinge It is connected with the driving slider; during the whole working process, the line segment with the two connecting hinge axes as the endpoints always intersects with the straight line passing through the hinge axis of the upper beam and the toggle hinge axis on the same side . Compared with the existing symmetrical six-bar linkage mechanism, the present invention has the advantages of good force-increasing effect, relatively uncomplicated stress on the load-bearing shaft, not easy to break, and low overall height of the mechanism.

Description

Symmetric toggle pressure transmission mechanism

technical field

The invention belongs to a connecting rod transmission mechanism, in particular to a pressure transmission mechanism.

Background technique

Symmetrical six-bar linkage press (product of Amino (Wuhan) High-Tech Co., Ltd.) is a newly popular plastic processing equipment. Compared with other traditional press mechanisms, such as the crank-connecting rod transmission press (see "<crank press", He Deyu, Machinery Industry Press, 1987), the toggle transmission press (see "Mechanical Press Knuckle Press") Optimum Design of Rod Transmission Mechanism", Zhang Yuantong, Zhu Denglin, "Machinery and Electronics", 2008(1), pp. 10-12), hydraulic transmission press (see "Design and Application of Hydraulic Press", Yu Xinlu, Machinery Industry Publishing House) and screw drive presses (see J58K series CNC electric screw presses of Wuhan Xinweiqi Technology Co., Ltd.) have certain advantages. It is reflected in: 1. The lateral force of the slider is equal to zero under the condition of no partial load, which not only ensures the service life of the guide rail, but also improves the forming accuracy. 2. The force-increasing function of the symmetrical six-bar linkage mechanism is more obvious, which reduces the driving torque of the motor. However, the transmission mechanism of the symmetrical six-link press has the following problems: 1. The height of the frame is large, which occupies a high space and requires a tall delivery room, thus increasing the construction cost of the plant; 2. The speed of the empty stroke is slow, resulting in work efficiency 3. The effective boosting stroke is short, resulting in a short working range of the mechanism.

The present invention provides a symmetrical toggle pressure transmission mechanism, the multiplier of force increase and the effective force increase stroke are obviously better than those of the symmetrical six-link mechanism; The rod mechanism is about 11% lower, which is more suitable for small factories and reduces construction costs; at the same time, there is no lateral force of the slider under the condition of no partial load; the idle stroke speed is higher than that of the symmetrical six-bar linkage mechanism.

Contents of the invention

For realizing the purpose of the present invention, the concrete technical scheme that adopts is:

A symmetrical toggle pressure transmission mechanism, comprising a slider, a drive source, a drive rod located in the center of the mechanism, and two toggle mechanisms symmetrically arranged on both sides of the axis of the drive rod, the toggle mechanism includes an upper toggle plate, a lower Toggle lever and intermediate link, the upper toggle plate is connected to one end of the lower toggle, one end of the intermediate link and the frame respectively through the toggle hinge, connecting hinge and upper beam hinge, and the other end of the lower toggle is connected to the slider through the slider hinge , the other end of the intermediate link is connected with the drive slider through the drive hinge,

It is characterized in that, during the whole working process of the mechanism, the line segment with the two connecting hinge axes as the endpoints always keeps intersecting the straight line passing through the hinge axis of the upper beam and the toggle hinge axis on the same side.

In the toggle mechanism of the present invention, there is at least one upper toggle plate, lower toggle link and intermediate link.

The present invention connects the auxiliary rod between the upper beam hinge and the toggle hinge.

The drive source of the present invention is a motor, the drive rod is composed of a screw and a nut, the nut and the screw form a ball screw structure, the motor is connected with the screw, the nut is fixed on the drive block, and the rotation of the screw drives the nut to move up and down. Push the drive block.

The driving source of the present invention is a motor, the driving rod is composed of a screw and a nut, the nut and the screw form a ball screw structure, the motor is connected with the nut, the screw is fixed on the drive block, and the rotation of the nut drives the screw to move up and down, thereby Push the drive block.

The motor of the present invention is connected with the screw or the nut through a worm gear and/or a gear set.

The driving source of the present invention is a hydraulic cylinder, the driving rod is a piston rod of the hydraulic cylinder, and the end of the piston rod is fixed on the driving block.

The upper bracket in the present invention is a triangular plate, a circular plate or a bracket.

A press, comprising a frame, a guide rail, a workbench, and the symmetrical toggle pressure transmission mechanism described in one of the above technical solutions.

An injection molding machine includes a frame, a guide rail, a workbench and a symmetrical toggle pressure transmission mechanism described in one of the above technical solutions.

The transmission feature of the present invention is that: the main driving rod drives the driving block to move back and forth along the axis of the main driving rod, so that the connecting hinge of the intermediate connecting rod drives the upper toggle lever to swing left and right, and at the same time, the toggle hinge of the upper toggle drives the lower toggle The synergistic action pushes the slider hinge to make the slider move up and down along the vertical track.

In the present invention, the drive block is hinged to one end of the symmetrical intermediate link, and the other end of the intermediate link is hinged to the symmetrically arranged upper toggle plate, and the upper toggle plate is hinged to the symmetrical lower toggle through the toggle hinge to form a booster mechanism together. If a drive rod is used to drive the drive block in the vertical direction, the slider can be reciprocated in a straight line up and down in the vertical direction. The pressure transmission mechanism and other auxiliary devices are used to form a press. The slider has no side pressure on the guide rail. It can greatly reduce friction and improve transmission efficiency. Due to the use of the principle of toggle force boosting and triangular plate force boosting, the press machine of the present invention can greatly reduce the input power under the same rated working load compared with the traditional crank connecting rod drive type press machine and toggle drive type press machine ;The working range of the rated load is larger; when the motor is used as the driving source, the slider can be controlled for variable speed movement, and the work efficiency can be improved. The press constituted by the invention not only has the characteristics of quickness, high positioning and repeat positioning accuracy of the mechanical press, but also has the pressure characteristic of the rated load and long working stroke of the hydraulic press.

When the present invention is driven by an AC motor, it can only output the required energy during work. For machines that work intermittently such as presses, no energy is consumed during the loading and unloading time, so it can basically save 50% energy compared with the general general driving method. %above. The control characteristics of the motor can be used to control the slider for variable speed movement and improve work efficiency.

The present invention not only has the characteristics of the hydraulic transmission mechanism but also the characteristics of the crank connecting rod transmission and the toggle transmission mechanism, and has the effect of increasing force; it can work with the rated load in most of the stroke range of the slider movement, and the slider can work at the full range of movement. The lateral force on the guide rail is equal to zero within the stroke range, the slider can move at variable speeds, and can maintain pressure at the bottom dead center; it is suitable for the forming of metal, non-metal and special materials.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention;

FIG. 3 is a schematic structural view of Embodiment 3 of the present invention;

Fig. 4 is the transmission schematic diagram of the present invention;

Fig. 5 is a comparison diagram of the present invention and the boosting effect of the symmetrical six-bar linkage mechanism;

Detailed ways

The pressure transmission mechanism of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment one

As shown in Figure 1, a first upper beam hinge 6A, a first toggle hinge 7A and a first connecting hinge 8A are fixed on the first upper bracket 3A, and the first upper bracket 3A is connected to the machine through the first upper beam hinge 6A. The frame 11 is connected; one end of the first lower toggle 4A is connected with the first upper toggle plate 3A through the first toggle hinge 7A, and the other end of the first lower toggle 4A is connected with the slider 10 through the first slider hinge 9A; the first One end of the intermediate connecting rod 2A is connected to the first upper toggle plate 3A through a first connecting hinge 8A, and the other end of the first intermediate connecting rod 2A is connected to the driving block 1 through a first driving hinge 5A.

Symmetrically, the second upper toggle plate 3B is fixed with a second upper beam hinge 6B, a second toggle hinge 7B and a second connecting hinge 8B, and the second upper toggle plate 3B is connected to the frame 11 through the second upper beam hinge 6B One end of the second lower toggle 4B is connected with the second upper toggle plate 3B through the second toggle hinge 7B, and the other end of the second lower toggle 4B is connected with the slider 10 through the second slider hinge 9B; the second intermediate link One end of 2B is connected to the second upper toggle plate 3B through the second connecting hinge 8B, and the other end of the second intermediate link 2B is connected to the driving block 1 through the second driving hinge 5B.

The drive block 1 is connected to the first intermediate link 2A through the first drive hinge 5A, and hinged to the second intermediate link 2B through the second drive hinge 5B;

Motor 14 is installed on the support 11, and motor 14 is connected with screw rod 13 by shaft coupling 12, and the nut on the screw rod 13 is fixed on drive block 1, and motor 14 can be rotated and driven in forward and reverse directions, and output torque and rotating speed can be controlled.

The axis of the screw 13 coincides with the centerline of the driving block 1, and the lower end of the screw 13 is fixed on the screw fixing device 16;

The slider 10 is connected with the first lower toggle 4A through the first slider hinge 9A, and connected with the second lower toggle 4B through the second slider hinge 9B. The slider 10 is guided by the guide rail 15 to prevent the Instability caused by partial load.

Fig. 4 is a transmission principle diagram of the present invention, the driving rod can move up and down along the axis of the driving rod, and drive the driving block 1 to move along the direction of the driving rod axis, and at the same time make the first middle connecting rod 2A on the left pass through the first connecting hinge 8A drives the first upper toggle plate 3A to swing left and right, so that the first upper toggle plate 3A and the first lower toggle lever 4A move cooperatively, and the movement of the mechanism on the right is exactly the same as that on the left, which is symmetrical. The mechanisms on the left and right sides work together to make the slider 1 move up and down smoothly without generating lateral pressure.

Driven by the nut, the drive block 1 moves up and down along the axial direction of the screw rod 13 together with the nut; at this time, the first toggle hinge 7A and the first connecting hinge 8A are restrained by the first upper toggle plate 3A, respectively. Swing left and right along the two circular arcs, the second toggle hinge 7B and the second connecting hinge 8B, under the constraint of the second upper toggle plate 3B, respectively swing left and right along the two circular arcs, the first The slider hinge 9A and the second slider hinge 9B drive the slider 10 to move up and down along the vertical direction.

The first upper toggle plate 3A and the second upper toggle plate 3B are driven to swing left and right by the first connecting hinge 8A and the second connecting hinge 8B, and at the same time, they can withstand the movement from the slider 10 through the first lower toggle lever 4A and the second toggle lever 4A. Two lower toggle levers 4B transmit the load that comes up, and the load is transmitted to the frame 11.

During the whole working process, the line segment with the axis center of the first connecting hinge 8A and the axis center of the second connecting hinge 8B as the end points intersects with the straight line passing through the axis center of the first upper beam hinge 6A and the axis center of the first toggle hinge , and also intersect with the straight line passing through the axis of the second beam hinge 6B and the axis of the second toggle hinge 7B.

Embodiment two

In order to ensure the force balance and stable operation of the mechanism, the respective numbers of the upper toggle plate, the lower toggle link and the intermediate link in the toggle mechanism can be arbitrarily determined according to actual needs without interference. In this embodiment, the single toggle mechanism has 2 upper toggle plates, 2 lower toggles, and 1 intermediate link.

As shown in Figure 2, a third upper toggle 3C, a third lower toggle 4C, a fourth upper toggle 3D, and a fourth lower toggle 4D are added to the mechanism, which are respectively connected with the first upper toggle 3A and the first lower toggle. The rod 4A, the second upper toggle plate 3B, and the second lower toggle lever 4B form a group corresponding to the front and rear. Specifically, the arrangement is as follows: the first intermediate link 2A is hinged with the first upper toggle plate 3A and the third upper toggle plate 3C through the first connecting hinge 8A, and the third lower toggle link 4C is through the third toggle hinge (due to interference that cannot be Shown in the figure) is hinged with the third upper toggle plate 3C, and the slider 10 is hinged with the first lower toggle 4A and the third lower toggle 4C through the first slider hinge 9A. The second intermediate link 2B is hinged with the second upper toggle plate 3B and the fourth upper toggle plate 3D through the second connecting hinge 8B, and the fourth lower toggle lever 4D is hinged through the fourth toggle hinge (due to interference, it cannot be shown in the figure). ) is hinged with the fourth upper toggle plate 3D, and the slider 10 is hinged with the second lower toggle lever 4B and the fourth lower toggle lever 4D through the second slider hinge 9B.

The other components of this embodiment are the same as those of Embodiment 1. Driven by the motor 14 and the screw rod 13, the slider can move up and down along the vertical direction.

Embodiment three

As shown in Figure 3, in this embodiment, in order to have better mechanical properties of the mechanism, the first auxiliary upper bracket 18A, the second auxiliary upper bracket 18B, and the third auxiliary upper bracket are added on the basis of the second embodiment. The plate 18C and the fourth auxiliary upper toggle plate 18D are specifically arranged as follows: the first auxiliary upper toggle plate 18A and the second auxiliary upper toggle plate 18B are respectively added on the front side of the first lower toggle lever 4A and the second lower toggle lever 4B, A third auxiliary upper toggle plate 18C and a fourth auxiliary upper toggle plate 18D (not shown in this figure) are respectively added on the rear side of the third lower toggle lever 4C and the fourth lower toggle lever 4D, and the first auxiliary upper toggle plate One end of 18A is hinged with the frame 11 through the first upper beam hinge 6A, the other end is hinged with the first lower toggle 4A through the first toggle hinge 7A, and one end of the second auxiliary upper toggle plate 18B is hinged through the second upper beam hinge 6B It is hinged with the frame 11, the other end is hinged with the second lower toggle 4B through the second toggle hinge 7B, one end of the third auxiliary upper toggle plate 18C is hinged with the frame 11 through the first upper beam hinge 6A, and the other end is hinged through the second Three toggle hinges 7C (not shown in the figure) are hinged with the third lower toggle 4C, one end of the fourth auxiliary upper toggle plate 18D is hinged through the second upper beam hinge 6B and the frame 11, and the other end is hinged through the fourth toggle hinge 7D (not shown among the figures) is hinged with the fourth lower toggle 4D.

The other components of this embodiment are the same as those of Embodiment 1. Driven by the motor 14 and the screw rod 13, the slider can move up and down along the vertical direction.

In the above embodiment, the driving source is a motor, the driving rod is composed of a screw and a nut, and the nut and the screw form a ball screw structure, the motor is connected with the screw through a coupling, and the nut is fixed on the driving block; in addition, between the motor and the screw is also It can be connected through worm gears, gear sets and other mechanisms; in addition, the motor can also drive the nut to rotate, and drive the screw to move up and down to push the drive block. The present invention can also adopt a hydraulic system as a driving source, the driving rod is a piston rod of a hydraulic cylinder, and the end of the piston rod is fixed on the driving block.

The present invention can be used for the press machine of plastic processing, the present invention is installed on the fuselage that has workbench 17, guide rail 15 specially designed to constitute press machine, will be hinged with the first upper beam hinge 6A and the second upper beam hinge 6B The bearing is fixed on the fuselage 11. The function of the guide rail 15 is to constrain the slider 10 so that when an eccentric load occurs during press processing, the guide rail can constrain the slider to maintain linear motion, thereby ensuring machining accuracy. The upper mold is installed on the bottom of the slider, and the lower mold is installed on the worktable, which can be used for plastic processing such as stamping, deep drawing, extrusion, and embossing of materials.

As shown in Figure 5, when the height of the present invention is 11% smaller than that of the symmetrical six-bar linkage mechanism and the width is the same, the load multiplier-stroke curve of the two structures driven by the same motor torque. The total stroke of the two mechanisms is 600 mm, and the bottom 200 mm is directly intercepted in this figure, and the leftmost end of the abscissa is the bottom dead center of the slider. The dotted line is the curve of the present invention, and the solid line is the curve of the symmetrical six-bar linkage mechanism. It can be clearly seen from the graph that the present invention is obviously stronger than the symmetrical six-bar linkage mechanism in terms of boosting effect. (The curve is not drawn to the left end to improve the readability of the graph. In fact, until the left end of the horizontal axis, the dotted line is higher than the solid line, and the gap is getting bigger and bigger)

Claims (10)

1. A symmetrical toggle pressure transmission mechanism, comprising a slider, a driving source, a driving rod located in the center of the mechanism, and two toggle mechanisms symmetrically arranged on both sides of the axis of the driving rod, and the toggle mechanism includes an upper toggle plate , the lower toggle link and the middle link, the upper toggle plate is respectively connected with one end of the lower toggle link, one end of the middle link link and the frame through the toggle hinge, connecting hinge and upper beam hinge, and the other end of the lower toggle link is connected with the slider hinge through the slider hinge. block connection, the other end of the intermediate link is connected to the drive block through the drive hinge, It is characterized in that, during the entire working process of the mechanism, the line segment with the two connecting hinge axes as the end points is always kept in contact with the elbow that passes through the hinge axis of the upper beam and is on the same side of the axis as the hinge axis of the upper beam. The lines intersecting the axes of the hinges. 2 . The symmetrical toggle pressure transmission mechanism according to claim 1 , wherein, in the toggle mechanism, there is at least one upper toggle plate, lower toggle link and intermediate link. 3 . 3. The symmetrical toggle pressure transmission mechanism according to claim 1 or 2, characterized in that an auxiliary lever is connected between the upper beam hinge and the toggle hinge. 4. The symmetrical toggle pressure transmission mechanism according to any one of claims 1-3, wherein the driving source is a motor, the driving rod is composed of a screw and a nut, and the nut and the screw constitute a ball screw structure, The motor is connected with the screw, the nut is fixed on the drive block, and the rotation of the screw drives the nut to move up and down to push the drive block. 5. The symmetrical toggle pressure transmission mechanism according to any one of claims 1-3, wherein the driving source is a motor, the driving rod is composed of a screw and a nut, and the nut and the screw constitute a ball screw structure, The motor is connected with the nut, the screw rod is fixed on the drive block, and the rotation of the nut drives the screw rod to move up and down, thereby pushing the drive block. 6. The symmetrical toggle pressure transmission mechanism according to claim 4 or 5, characterized in that the motor and the screw or nut are connected by a worm gear and/or a gear set. 7. The symmetrical toggle pressure transmission mechanism according to any one of claims 1-3, wherein the driving source is a hydraulic cylinder, the driving rod is a piston rod of the hydraulic cylinder, and the end of the piston rod is fixed on the driving block superior. 8. The symmetrical toggle pressure transmission mechanism according to any one of claims 1-7, characterized in that: the upper toggle plate is a triangular plate, a circular plate or a bracket. 9. A press, comprising a frame, a guide rail, a workbench and the symmetrical toggle press transmission mechanism according to any one of claims 1-8. 10. An injection molding machine, comprising a frame, a guide rail, a workbench and the symmetrical toggle pressure transmission mechanism according to any one of claims 1-8.

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