CN106926511B - The protection of mechanical press electromechanical overload and stretching device and method - Google Patents

Abstract

An electromechanical overload protection and stretching device for a mechanical press, comprising a vertically arranged press connecting rod, a blind hole is vertically provided at the bottom of the press connecting rod, and a guide rod is vertically provided below the press connecting rod , a movable rod matched with the blind hole is arranged on the top of the guide rod, and the movable rod is movably installed in the blind hole. The present invention adopts the above-mentioned structure, and no longer installs the overload protection device in the slider body, and does not need to dismantle the slider device during maintenance and repair after long-term use. The maintenance and repair operation is convenient, and the installation of the device is simple and reliable. It has the advantages of safety, reliability, high efficiency, low cost, green environmental protection, prolonging the service life of mechanical presses and molds, and improving the quality of product molding.

Description

Electromechanical overload protection and stretching device and method for mechanical press

Technical field:

The invention relates to the field of forging machine tools, in particular to an electromechanical overload protection and stretching device and method for a mechanical press.

Background technique:

At present, most of the overload protection devices for mechanical presses on the market are divided into two types. One is the collapse block safety device, as shown in Figure 2, which includes a cover, a connecting rod, a locking block, a ball screw, a screw, and a ball. Head gland, ball head seat, safety device, safety backing plate, slider body, clamp module, material baffle, pointer, pressure plate and other structures, the other is hydraulic overload protection device, as shown in Figure 3, including connecting Rod, ball screw, threaded gland, gland, screw, ball gland, flat key, worm gear, pin, stop ring, oil cylinder, ball piston, hydraulic oil gauge, rectangular seal for hole, slider body, worm , Hydraulic pump station and other structures. It is mainly used for overload protection during the working process of the press, that is, an unloading device when the load exceeds 100%-110% of the rated load during operation. At the same time, when the press is overloaded, the overload protection system can quickly restore the press to the working state. In actual production, it is found that both the crushed block safety device and the hydraulic overload protection device have certain defects. Slight overloading of the collapsed block type fuse will not necessarily break the metal fuse, and the machine tool can work normally without an alarm. With the press machine overloaded for a long time, the fatigue strength of the metal fuse increases, and the metal fuse deforms or even breaks. The theory In practice, the damaged fuse can be taken out from the square at the front end of the slider for replacement. In practice, it often happens that the fuse is deformed and stuck in the inner cavity of the slider and cannot be pulled out. It is necessary to disassemble the upper connecting rod and the slider, which will lead to maintenance time. Long, laborious, and affect the efficiency of equipment use. The hydraulic overload protection device used in medium and large mechanical presses often leaks and does not unload according to the nominal pressure during use, and its reliability and stability are poor. Experience and experimental methods are usually used to explore and solve, and it is impossible to find the cause of early unloading fundamentally without wasting time. Oil pipes, welded oil tanks and seals may leak oil due to excessive instantaneous pressure or long-term use, which will have a certain impact on the subsequent repair and maintenance of the machine tool. Moreover, the built-in hydraulic oil cylinder of the slider body of the hydraulic overload protection device has a complex structure, high manufacturing requirements, and high cost.

In addition, when the open-type, closed-type single-, double-point, and four-point mechanical presses are working, under the action of power, the connecting rod drives the slider body down, and the stamping, extrusion, die forging, etc. are completed at the moment the upper and lower molds are closed. With stretch or flexible stretch function. The instant the mold is closed may cause burrs on the stamping workpiece, poor surface roughness, incomplete stretching, or a decrease in the pass rate of the workpiece due to rapid extrusion of the workpiece. If the servo press is used, the equipment investment cost is very high, and the production efficiency of the hydraulic press is relatively high. Inferior question.

Invention content:

The invention provides an electromechanical overload protection and stretching device and method for a mechanical press. The service life of the mechanical press and the mold and the advantages of improving the molding quality of the product solve the problems existing in the prior art.

The technical scheme that the present invention adopts for solving the problems of the technologies described above is:

An electromechanical overload protection and stretching device for a mechanical press, comprising a vertically arranged press connecting rod, a blind hole is vertically provided at the bottom of the press connecting rod, and a guide rod is vertically provided below the press connecting rod , on the top of the guide rod, there is a movable rod matching with the blind hole. The rod and the guide rod are connected by several vertically arranged bolts, the top of the bolt is threadedly connected with the connecting rod of the press, the bolt rod moves through the guide rod, and a travel switch is arranged on the top of the guide rod below the connecting rod of the press. It is connected with the electrical overload protection control system; the bottom of the guide rod is connected with the top of the vertically arranged ball screw, and the ball head of the ball screw is connected with the slider body.

An adjustable switch bracket is arranged on the top of the guide rod, and the travel switch is installed on the switch bracket.

An electromechanical overload protection method for a mechanical press. During the working process of the press, the connecting rod of the press drives the slider body to move back and forth up and down. When the overload exceeds the compression stroke of the maximum nominal force set by the disc spring, the lower end surface of the connecting rod of the press Move and touch the limit switch, the limit switch sends a signal to the electrical overload protection control system, the electrical overload protection control system starts to realize the clutch disengagement of the press, the brake is engaged, the slider body stops downward, and the electromechanical overload protection of the mechanical press is realized.

A mechanical press stretching method. During the working process of the press, the connecting rod of the press drives the slider body to move back and forth up and down, connects the upper mold under the slider body, and drives the upper mold to move downward and the lower mold to close the stamping When the pressure of the workpiece exceeds the set tension pre-pressure of the disc spring, the disc spring begins to compress, and the upper die continues to increase force and decelerates downward, realizing stamping, extrusion, die forging forming and stretching.

The present invention adopts the above-mentioned structure, and the overload protection device is no longer arranged in the slider body, and the slider equipment does not need to be dismantled during maintenance and repair after long-term use. High, reducing the manufacturing cost of the whole machine equipment, there will be no oil leakage during work, and will not affect the repair and maintenance of the machine tool; in addition, the press connecting rod designed with elastic pre-tightening force is Flexible stretching can be realized during the process, and the edge and surface of the produced workpiece are smooth, and the qualified rate of the workpiece is high. It has the advantages of unique structure, safety and reliability, high efficiency, low cost, green environmental protection, prolonging the service life of mechanical presses and molds, and improving product molding quality.

Description of drawings:

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural view of a traditional press-collapsed block safety device.

Fig. 3 is a structural schematic diagram of a traditional press hydraulic overload protection device.

In the figure, 1. Press connecting rod, 2. Blind hole, 3. Guide rod, 4. Moving rod, 5. Belleville spring, 6. Bolt, 7. Switch bracket, 8. Travel switch, 9. Ball screw, 10. Spherical mounting groove, 11. Ball gland, 12. Threaded gland, 13. Gland, 14. Screw, 15. Worm wheel, 16. Flat key, 17. Pin, 18. Worm screw, 19. Slider body , 1-1, cover, 1-2, connecting rod, 1-3, locking block, 1-4, ball screw, 1-5, screw, 1-6, ball gland, 1-7, ball Head seat, 1-8, fuse, 1-9, fuse backing plate, 1-10 slider body, 1-11, clip module, 1-12, retaining plate, 1-13 pointer, 1-14, Pressing plate, 2-1, connecting rod, 2-2, ball screw, 2-3, screw gland, 2-4, gland, 2-5, screw, 2-6, ball gland, 2-7 , flat key, 2-8, worm gear, 2-9, pin, 2-10, stop ring, 2-11, oil cylinder, 2-12, ball piston, 2-13, hydraulic oil gauge, 2-14, hole Seal with rectangle, 2-15, slider body, 2-16, worm screw, 2-17, hydraulic pump station.

Detailed ways:

In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings.

As shown in Fig. 1, a mechanical press electromechanical overload protection and stretching device includes a vertically arranged press connecting rod 1, a blind hole 2 is vertically arranged at the bottom of the press connecting rod 1, and A guide rod 3 is vertically provided below the connecting rod 1, and a movable rod 4 matched with the blind hole 2 is arranged on the top of the guide rod 3. The outer side of the movable rod 4 between the guide rods 3 is provided with a butterfly spring 5, the press connecting rod 1 and the guide rod 3 are connected by several vertically arranged bolts 6, and the top of the bolt 6 is threadedly connected with the press connecting rod 1, The bolt rod moves through the guide rod 3, and a travel switch 8 is arranged on the top of the guide rod 3 below the press connecting rod 1, and the travel switch 8 is connected with the electrical overload protection control system; the bottom of the guide rod 3 is connected to the vertically arranged spherical The top ends of the screw rods 9 are connected, and the ball head of the spherical screw rod 9 is connected with the slider body 19 .

An adjustable switch bracket 7 is arranged on the top of the guide rod 3, and the travel switch 8 is installed on the switch bracket 7.

During the working process of the press, the press connecting rod 1 drives the slider body 19 to move back and forth up and down, and the overload exceeds the compression stroke of the maximum nominal force set by the disc spring 5, and the lower end surface of the press connecting rod 1 moves to touch the travel switch 8, Travel switch 8 sends a signal to the electrical overload protection control system, and the electrical overload protection control system starts to realize the clutch disengagement and brake engagement of the press, and the slider body 19 stops descending to realize the electromechanical overload protection of the mechanical press.

During the working process of the press, the connecting rod 1 of the press drives the slider body 19 to move back and forth up and down, connects the upper mold under the slider body 19, and drives the upper mold to move downward and close the lower mold to stamp the workpiece, and the pressure exceeds the disc shape. Spring 5 sets the pre-tensioning pressure, disc spring 5 begins to compress, and the upper mold continues to increase force and decelerates downward, realizing stamping, extrusion, die forging forming and stretching.

With the electromechanical overload protection and stretching device of the mechanical press of the present invention, the overload protection device is no longer arranged in the slider body 19, and the slider device does not need to be removed for maintenance and repair after long-term use, and the maintenance and repair operation is convenient. The installation of the device is simple and reliable, and the requirements for manufacturing are not high, which reduces the manufacturing cost of the whole machine equipment, and there will be no oil leakage during work, and will not affect the repair and maintenance of the machine tool; in addition, the elastic preload is adopted The press connecting rod 1 designed by force can realize flexible stretching during the stamping process, and the produced workpiece has smooth edges and smooth surfaces, and the workpiece has a high pass rate. It has unique structure, safety and reliability, high efficiency, low cost, It has the advantages of green environmental protection, prolonging the service life of mechanical presses and molds, and improving the quality of product molding.

The above specific implementation manners cannot be regarded as limiting the protection scope of the present invention. For those skilled in the art, any substitution, improvement or transformation made to the implementation manners of the present invention shall fall within the protection scope of the present invention.

The parts of the present invention that are not described in detail are known technologies of those skilled in the art.

Claims (2)

1. a kind of mechanical press drawing process, it is characterised in that：Forcing press includes the press connecting rod being vertically arranged, in pressure The bottom of machine connecting rod is equipped with a blind hole vertically, a guide rod is equipped with vertically in the lower section of press connecting rod, at the top of guide rod Equipped with one and the matched motion bar of blind hole, motion bar is movably arranged in blind hole, between press connecting rod and guide rod Motion bar outer sheath is connected equipped with butterfly spring, press connecting rod and guide rod by several bolts being vertically arranged, bolt Top is connect with press connecting bar screw-thread, and shank of bolt activity passes through guide rod, the top of the guide rod below press connecting rod Equipped with travel switch, travel switch is connected with electrical overloads Protection control system；The bottom of guide rod and the spherical shape being vertically arranged The top of screw rod is connected, and the bulb of ball screw is connected with slide body；During forcing press works, press connecting rod band Movable slider body moves up and down, and mold is connected below slide body, and mold is driven to move downward and is closed with lower mold Stamped workpieces, pressure are more than that disk spring setting stretches precompression, and disk spring starts to compress, and mold continues under reinforcement deceleration Row realizes that punching press, extruding, die-forging forming stretch.

2. a kind of mechanical press drawing process according to claim 1, it is characterised in that：It is equipped at the top of guide rod Adjustable switch bracket, the travel switch are mounted on switch bracket.