CN102744594A - Electro-pneumatic type automatic pressing machine - Google Patents

Abstract

The invention discloses an electro-pneumatic automatic press, which has an electric control box, an air pump and a pressure device. The pressure device is provided with a top plate and a bottom plate with a fixed distance, a middle plate with a variable distance from the bottom plate, and a cylinder connected to the middle plate and Its jacking mechanism forms a workpiece pressing cavity between the middle plate and the bottom plate. In particular, the jacking mechanism of the pressure device includes at least two sets of crank arm units, any set of crank arm units includes a first connecting rod, a second connecting rod and a third connecting rod connected by bending, wherein the first connecting rod is connected to the cylinder piston The rods are connected, the second connecting rod is connected to the top plate in a leveraged manner, the third connecting rod is connected to the middle plate, and the second connecting rod is interconnected with the third connecting rod at the end of the piston rod retraction stroke to form a linear self-locking structure. The application of the press machine of the present invention greatly saves energy consumption; and effectively solves the problem of unstable transmission and improves the mechanical transmission efficiency.

Description

An electro-pneumatic automatic press

technical field

The invention relates to a mechanical crimping device, in particular to an electro-pneumatic automatic pressure device which can save energy consumption of an air pump.

Background technique

In the field of mechanical processing, automatic presses are a relatively common post-processing equipment, and deep processing is performed on the initially processed molding products under the precision requirements. However, in the traditional processing process, the electro-pneumatic automatic press machine used requires continuous pressure to press the workpiece, resulting in a huge investment in processing energy consumption. Moreover, the traditional extrusion molding process uses the cylinder piston rod to push the pressure plate. Since the contact point between the piston rod and the pressure plate is located at the geometric center of the relative pressure plate and is relatively concentrated, the extrusion of the workpiece is prone to deflection or local uneven force. Phenomenon, which in turn affects the quality of such post-processing finished products.

Contents of the invention

In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide an electro-pneumatic automatic press to solve the problems of uneven extrusion transmission and reduce energy consumption.

The purpose of the present invention will be achieved through the following technical proposals: an electro-pneumatic automatic press has an electric control box, an air pump connected to the output of the electric control box, and a pressure device connected to the output of the air pump, and the pressure device is set There is a top plate and a bottom plate with a fixed distance, a middle plate with a changing distance relative to the bottom plate, a cylinder connected to the middle plate and its jacking mechanism, a workpiece pressing cavity is formed between the middle plate and the bottom plate, and the feature is that the pressure device The jacking mechanism includes at least two groups of crank arm units, and any set of crank arm units includes a first connecting rod, a second connecting rod and a third connecting rod connected by bending, wherein the first connecting rod is connected with the cylinder piston rod, and the second connecting rod The rod is connected to the top plate in a levered manner, the third connecting rod is connected to the middle plate, and the second connecting rod is interconnected with the third connecting rod at the end of the piston rod retraction stroke to form a linear self-locking structure.

Further, a vertical guide post is provided between the top plate and the bottom plate, and the middle plate is slidably connected to the guide post and kept parallel to the bottom plate.

Further, the automatic press is equipped with a sensing device, the output of which is connected to the electrical control box, and the sensing device includes a first sensor for detecting that the middle plate is loosened in place and a second sensor for detecting that the middle plate is pressed into place. sensor.

Furthermore, the automatic press is provided with a sensor bracket along the direction of the transmission force of the jacking mechanism, and the sensing device is attached to the sensor bracket.

Further, the air pump is provided with an electromagnetic reversing valve.

Further, the at least two groups of crank arm units form a jacking mechanism that is symmetrically arranged side by side with respect to the middle plate width.

After the application of an electro-pneumatic automatic press of the present invention is implemented, its outstanding effect is reflected in: on the one hand, because the jacking mechanism of the press has a self-locking structure, it is not necessary to continuously provide High air pressure greatly saves energy consumption; on the other hand, due to the use of parallel and symmetrically arranged jacking mechanisms, the problem of uneven transmission is effectively solved and the efficiency of mechanical transmission is improved.

Description of drawings

Fig. 1 is the structural representation of automatic press machine of the present invention.

Detailed ways

In the following, the specific implementation manners of the present invention will be further described in detail in conjunction with the accompanying drawings of the embodiments, so as to make the technical solution of the present invention easier to understand and grasp.

The present invention aims at the shortage of extrusion molding equipment in the prior art, and designs and proposes an electro-pneumatic automatic press. Seen in conjunction with FIG. 1 , it is similar to traditional equipment in that it has an electrical control box 1 , an air pump 2 connected to the output of the electrical control box, and a pressure device 3 connected to the output of the air pump. The pressure device 3 is provided with a top plate 32 and a bottom plate 31 with a fixed distance, a middle plate 33 with a variable distance relative to the bottom plate, a cylinder 34 connected to the middle plate and its jacking mechanism, and a workpiece pressing chamber is formed between the middle plate 33 and the bottom plate 31 36. From the point of view of the innovation of the present invention, the main aspect is that the jacking mechanism of the pressure device includes at least two sets of crank arm units. In terms of any set of crank arm units, it includes the first connecting rod 351 connected by bending, the second connecting rod 351 The connecting rod 352 and the third connecting rod 353, wherein the first connecting rod 351 is connected to the cylinder piston rod 341, the second connecting rod 352 is connected to the top plate 32 in a leveraged manner, the third connecting rod 353 is connected to the middle plate 33, and the first connecting rod 351 is connected to the middle plate 33. The second connecting rod 352 interconnects with the third connecting rod 353 at the end point of the contraction stroke of the piston rod 341 to form a linear self-locking structure. In detail, the first connecting rod 351 is connected to the piston rod 341 in a fixed shape, and moves up and down with the stroke direction of the piston rod; and the lever-type connection between the second connecting rod 352 and the top plate 32 means that the second connecting rod 352 and the top plate 32 The top plate is movably connected to point A, and the second link 352 can rotate around point A relative to the top plate; while the second link 352 is connected to points B and C respectively with the first link and the third link, and the second link 352 The three connecting rods are movably connected to the middle plate at point D.

In addition, a vertical guide post 37 is disposed between the top plate 32 and the bottom plate 31 , and the middle plate 33 is slidably connected to the guide post 37 and kept parallel to the bottom plate 31 .

The automatic press is also provided with a sensing device, the output of which is connected to the electrical control box, including a first sensor 42 for detecting that the middle plate is loosened and a second sensor 41 for detecting that the middle plate is pressed into place. The automatic press is provided with a sensor bracket along the transmission force direction of the jacking mechanism. The sensing device is mounted on the sensor bracket, and its position can be adjusted according to the precision.

The air pump is provided with an electromagnetic reversing valve 21, specifically a double-acting two-position five-way electromagnetic reversing valve, wherein the two positions are respectively Y1 and Y2, and the air pump is connected to the cylinder 34 through air pipes 22 and 23.

It can be understood from the illustration that the piston rod 341, the first connecting rod 351, the AB section on the second connecting rod 352 and the top plate 32 form a slider crank mechanism I; the AC section on the second connecting rod 352, the third connecting rod 353, middle plate 33 and top plate 32 constitute a slider crank mechanism II.

Analyze the operation process of this automatic press with the position shown in the figure. When the solenoid valve Y1 is energized, the gas pipe 22 is fed to the right and the gas pipe 23 is discharged to the left, the piston rod 341 moves downward, and the first cylinder in the slider crank mechanism The second connecting rod will move clockwise around point A, thereby driving the middle plate in the slider crank mechanism II to move upward, and loosen the workpiece (not shown) pressed between the middle plate and the bottom plate, and the first sensor will 42 Detect the signal of loosening in place, and send it to the electric control box, so that the Y1 position of the solenoid valve is de-energized. Conversely, when the Y2 electromagnetic valve is energized, when the air pipe 23 takes in air to the right and the air pipe 22 leaves air to the left, when the piston rod moves upward, the middle plate moves downward to press the workpiece. The middle plate 33 moves to a certain limit position (AC and CD are in line), and the second sensor 41 detects the signal of pressing in place, which is sent to the electric control box to de-energize the Y2 position of the solenoid valve. At this time, if the middle plate is to be loosened due to the interaction force of the pressure, the middle plate is used as the active part in the slider crank mechanism II. In the slider crank mechanism, when the middle plate is taken as the active part, the second 1. The collinear position of the third connecting rod constitutes a self-locking structure (also called "dead point position"), and the crank arm unit cannot move. Therefore, even if the cylinder is not ventilated, the middle plate cannot be released, which plays a role of self-locking. After the present invention is applied to industrial production, the press is in a clamped state most of the time, and there is no need to provide high pressure all the time. Gas, greatly saving energy. When the workpiece needs to be loosened, the piston rod moves downward, driving the second connecting rod in the slider crank mechanism II to rotate clockwise. At this time, the connecting rod of the crank arm unit is used as the active part, and there is no dead point. The mechanism can thus release the workpiece again.

From the point of view of only needing to realize the action, only one crank arm unit in the whole device can be completed. However, since the rods have thickness, the centers of gravity of each rod must not be in the same plane after being connected by hinges, and the motion center of such a transmission mechanism will be offset relative to the geometric center of the press, which will cause the problem of unstable transmission. And there are many ineffective component forces, which make the organization do useless work. Therefore, it is necessary to adopt multiple sets of crank arm units to overcome this defect. The at least two groups of crank arm units form a jacking mechanism that is symmetrically arranged in parallel with respect to the width of the middle plate. If it is two groups of one pair, four groups of two pairs are arranged side by side symmetrically; it can also be three to five groups of axial uniform arrangement. In the illustrated embodiment, four groups of two pairs are symmetrically arranged side by side, and the projections of each crank arm unit on the middle plate are distributed in a square shape. However, when arranged symmetrically with a side-by-side structure as shown in the figure, the transmission force of the mechanism will be distributed in parallel along the axis of the guide column, which not only solves the problem of unstable transmission, but also improves the effective component force and improves the mechanism. transmission efficiency.

Claims (6)

1. An electro-pneumatic automatic press has an electric control box, an air pump connected to the output of the electric control box, and a pressure device connected to the output of the air pump. A variable middle plate, a cylinder connected to the middle plate and its jacking mechanism, a workpiece press-fitting cavity is formed between the middle plate and the bottom plate, and it is characterized in that the jacking mechanism of the pressure device includes at least two sets of crank arm units, Any set of curved arm units includes a first connecting rod, a second connecting rod and a third connecting rod connected by bending, wherein the first connecting rod is connected with the piston rod of the cylinder, the second connecting rod is connected with the top plate in a levered manner, and the third connecting rod is The rod is connected with the middle plate, and the second connecting rod is interconnected with the third connecting rod at the end point of the retraction stroke of the piston rod to form a linear self-locking structure. 2. An electro-pneumatic automatic press according to claim 1, wherein a vertical guide post is provided between the top plate and the bottom plate, and the middle plate is slidably connected to the guide post, Keep parallel to the base. 3. An electro-pneumatic automatic press according to claim 1, characterized in that: the automatic press is provided with a sensing device, the output of which is connected to the electrical control box, and the sensing device includes The first sensor for the board to be released into place and the second sensor for detecting the middle board is pressed into place. 4. An electro-pneumatic automatic press according to claim 3, characterized in that: the automatic press is provided with a sensor bracket along the transmission force direction of the jacking mechanism, and the sensing device is attached to the sensor bracket superior. 5. An electro-pneumatic automatic press according to claim 1, wherein the air pump is provided with an electromagnetic reversing valve. 6. An electro-pneumatic automatic press according to claim 1, characterized in that: said at least two groups of crank arm units form a jacking mechanism arranged side by side and symmetrically relative to the width of the middle plate.

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