CN101623919B - Mould clamping mechanism of crank connecting rod - Google Patents

Abstract

The invention relates to a toggle link mold clamping mechanism, which includes a tail plate, a movable template and a pair of toggle link structures, and each toggle link structure includes a front link, a rear link, a small link and a push rod. seat, wherein the front end of the front connecting rod is hinged to the rear end of the movable template, the rear end of the front connecting rod is hinged to the front end of the rear connecting rod, the rear end of the rear connecting rod is hinged to the front end of the tail plate, and one end of the small connecting rod is connected to the The middle part of the rear link is hinged, and the other end is hinged with one side of the push seat, and the push seat is limited between the tail plate and the movable template and can move back and forth. There are two front lugs hinged with the rear end face of the movable template, and the rear end of the front connecting rod has three rear lugs hinged with the rear connecting rod. The toggle link mold clamping mechanism has the advantages of simple structure and long service life of the movable template and the tail plate.

Description

Toggle linkage mold clamping mechanism

technical field

The invention relates to a mold clamping mechanism in an injection molding machine, in particular to a toggle linkage mold clamping mechanism.

Background technique

The mold clamping mechanism of a traditional injection molding machine uses a clamping cylinder to complete the entire mold opening and clamping process. In order to obtain a large clamping force, it needs to use a large flow clamping cylinder, so the weight of the clamping cylinder is heavy and difficult to assemble. It is difficult to disassemble and repair, and because the large-flow clamping cylinder has a large bore, it is easy to wear and tear after long-term use, causing internal leakage of the cylinder, and the durability is not good. Moreover, the speed of driving the large-flow clamping cylinder is relatively slow Difficult to achieve fast mold opening and locking.

In view of the above-mentioned status quo, in recent years, the design and manufacture of injection molding machines with double toggle five hinge connecting rod clamping mechanism has gradually developed in China. The core part of the double toggle five hinge connecting rod clamping mechanism is the connecting rod that transmits the movement of the oil cylinder. part.

When the hydraulic cylinder is used to drive the piston rod to do uniform linear motion, the moving template driven by the toggle linkage mechanism will produce a slow-fast-slow speed characteristic, which is suitable for the process requirements of the mold opening and closing of the template. If it is driven by a servo motor, it can be changed The variable-speed motion of the piston rod makes it possible to obtain high-speed, stable motion characteristics of the movable platen, and save energy. When the toggle mechanism is straightened, it can enter the self-locking state. After the mold is locked, the elastic reaction force generated by the deformation cannot make the mold open, so the power of the input end can be temporarily cut off, and energy saving and cost reduction can be achieved.

Due to the relative rotation between the large pin in the tail plate of the injection molding machine and the tail plate in the current double toggle five-hinge connecting rod mold clamping mechanism, it is easy to cause the wear of the tail plate and reduce the life of the tail plate; and the connecting rod The front connecting rod in the structure is a plurality of independent rods, so its strength and rigidity are low.

Such a similar toggle mold clamping mechanism is disclosed in the Chinese invention patent "Engbow Clamping Mechanism" that is ZL02138666.8 (publication number is CN1502461A) as a patent number.

Contents of the invention

The technical problem to be solved by the present invention is to provide a toggle link mold clamping mechanism with a high structural strength of the toggle link in view of the above-mentioned prior art. The mechanism has a simple structure and a long service life advantage.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a toggle link mold clamping mechanism, including a tail plate, a movable platen and a device arranged between the tail plate and the movable platen to drive the movable platen to move relative to the tail plate. For the toggle link structure, each toggle link structure includes a front link, a rear link, a small link and a push seat. One end of the small connecting rod is hinged with the front end of the rear connecting rod, the rear end of the rear connecting rod is hinged with the front end of the tail plate, one end of the small connecting rod is hinged with the middle part of the rear connecting rod, the other end is hinged with one side of the push seat, and the push seat It is limited between the tail plate and the movable template by the guide rod and can move back and forth, the feature is that: the front connecting rod is an integral part, and the front end of the front connecting rod has two front lugs hinged with the rear end surface of the movable template , the rear end of the front link has three rear lugs that are hinged with the rear link.

The rear end surface of the above-mentioned movable template has a first intermediate bracket, and a first large pin is fixed on the first intermediate bracket. The first large pin cannot rotate relative to the first intermediate bracket. The lugs are movably sleeved on the first large pin and can rotate relative to the first large pin; the three rear lugs of the front connecting rod are fixed with the second large pin, and the second large pin cannot Rotate relative to the front connecting rod, the front end of the rear connecting rod is movably sleeved on the second large pin shaft and can rotate relative to the second large pin shaft, and the rear connecting rod is composed of the first rear connecting rod and the second rear connecting rod which are independent of each other. The first rear link and the second rear link are located between two adjacent rear lugs and are in close contact with the end faces of the rear lugs; the front end of the tail plate has a second intermediate bracket, A third large pin is fixed on the second intermediate bracket, and the third large pin cannot rotate relative to the second intermediate bracket. The rear end of the rear link is movably sleeved on the third large pin and can Rotate relative to the third large pin; the small connecting rod is composed of the first small connecting rod, the second small connecting rod and the third small connecting rod independent of each other, and the two ends of the first small pin are connected with the first small connecting rod One end of the rod and the third small connecting rod is fixed, the first small pin cannot rotate relative to the first small connecting rod and the third small connecting rod, and the second small connecting rod is sleeved on the first small pin In the middle part, the middle part of the first rear connecting rod is movably sleeved on the second small pin shaft and can rotate relative to the second small pin shaft, and the first rear connecting rod is located between the first small connecting rod and the second small connecting rod. and the end surfaces are close to each other, the middle part of the second rear connecting rod is movably sleeved on the second small pin shaft and can rotate relative to the second small pin shaft, and the second rear connecting rod is located on the second small connecting rod and the third small connecting rod and the end surfaces are close to each other; the two ends of a second small pin are fixed with the other ends of the first small connecting rod and the third small connecting rod, and the second small pin cannot be opposite to the first The small connecting rod and the third small connecting rod rotate, the other end of the second small connecting rod is sleeved in the middle of the second small pin, and the two lugs on one side of the push seat are movably sleeved on the second on the small pin shaft and can rotate relative to the second small pin shaft.

There is a groove on the two outer end surfaces of the first large pin, correspondingly there are also grooves on the two outermost end surfaces of the first intermediate bracket, and a first clamping plate is simultaneously stuck on the first intermediate bracket of the first large pin In the groove; the two outer end surfaces of the second large pin have a groove, correspondingly there are also grooves on the two outermost end surfaces of the rear lug, and a second clamping plate is simultaneously clamped on the second large pin and the rear In the groove of the lug; there is a groove on the two outer end surfaces of the third large pin, and correspondingly, there are grooves on the two outermost end surfaces of the second intermediate bracket, and a third clamping plate is stuck on the third large pin at the same time. In the groove of the shaft and the second intermediate bracket; a groove is opened on the two outer end surfaces of the first small pin shaft, and a groove is also opened on the outer end surface of one end of the corresponding first small connecting rod and the third small connecting rod. The four clips are stuck in the grooves of the first small pin shaft, the first small connecting rod and the third small connecting rod at the same time; a groove is opened on the two outer end surfaces of the second small pin shaft, and correspondingly the first small connecting rod There are also grooves on the outer end surface of the other end of the third small connecting rod, and a fifth clip is stuck in the grooves of the second small pin, the first small connecting rod and the third small connecting rod simultaneously.

Compared with the prior art, the present invention has the advantages of:

①. The front connecting rod is made into an integral part, which eliminates the cumulative error of processing each one separately, improves the machining accuracy of the front connecting rod, and improves the stiffness of the front connecting rod, simplifies the assembly process and reduces the manufacturing cost.

② There is no relative rotation and fixation between the major pins and the movable platen and tail plate; there is no relative rotation and fixation between the small pins and the small connecting rods, which eliminates the wear and tear of the movable platen, tail plate and large pins, and improves the The life of the movable template and the tail plate saves costs; at the same time, the rear connecting rod and the front connecting rod are tightly fitted, and the small connecting rod and the rear connecting rod are also closely fitted. Only the front connecting rod and the The rear connecting rod is finished, while the front connecting rod and the rear connecting rod are rods, and the end faces are processed during processing, so the processing is convenient. At the same time, the inner surfaces of each bracket and push seat do not need to be processed. Even if there is a large gap between each bracket and push seat, it will not affect the stability of the action of the toggle structure, but it is very difficult to finish the joint surface between each bracket, push seat and each connecting rod. As mentioned above, the toggle mechanism greatly reduces processing difficulty and manufacturing cost, and improves production efficiency.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the embodiment of the present invention;

Fig. 2 is the side view of the mold opening state of the embodiment of the present invention;

Fig. 3 is the sectional view (front view direction) of the mold opening state of the embodiment of the present invention;

Fig. 4 is a side view of the clamped state of the embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection between the small connecting rod, the push seat and the rear connecting rod in the embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 5, it should be a preferred embodiment of the present invention.

A toggle link mold clamping mechanism, comprising an end plate 1, a movable platen 2, and a pair of toggle link structures arranged between the end plate 1 and the movable platen 2 to drive the movable platen 2 to move relative to the end plate 1, The tail plate 1 is fixed on the frame of the injection molding machine, four pull rods 12 are fixed on the tail plate 1, the other ends of the four pull rods 12 are fixed on the head plate 13, and the movable template 2 is sleeved on the four ends of the frame. On the root pull rod 12, and can slide up and down along the pull rod 12, each toggle link structure comprises front connecting rod 3, rear connecting rod 4, small connecting rod 5 and push seat 6 again.

Wherein, the front connecting rod 3 is an integral part, and the front end of the front connecting rod 3 has two front lugs 31 hinged with the rear end surface of the movable template 2, the front lugs 31 are arranged at intervals, and the rear end of the front connecting rod 3 has a The three rear lugs 32 hinged by the rear connecting rod 4 are arranged at intervals.

The front end of the front connecting rod 3 is hinged with the rear end surface of the movable template 2, that is, the rear end surface of the movable template 2 has a first intermediate bracket 21, and the first intermediate bracket 21 is fixed with a first large pin 22, the first large pin There are grooves on the two outer end faces of 22, correspondingly, grooves are also formed on the two outermost end faces of the first middle bracket 21, and a first clip 7 is stuck in the groove of the first middle bracket 21 of the first large pin 22 at the same time. In this way, the first large pin shaft 22 cannot rotate relative to the first intermediate bracket 21, and the two front lugs 31 of the front connecting rod 3 are movably sleeved on the first large pin shaft 22 and can rotate relative to the first large pin shaft 22 .

The rear end of the front connecting rod 3 is hinged with the front end of the rear connecting rod 4, that is, the three rear lugs 32 of the front connecting rod 3 are fixed with the second large pin 33, and the two outer end surfaces of the second large pin 33 There is a groove on the top, correspondingly, grooves are also formed on the two outermost end surfaces of the rear lug 32, and a second clamping plate 8 is stuck in the groove of the second large pin shaft 33 and the rear lug 32 at the same time, so that the second large pin Axle 33 can not rotate with respect to front link 3, and back link 4 is made up of the first back link 41 and the second back link 42 that are independent of each other, the front movable sleeve of the first back link 41 and the second back link 42 It is arranged on the second large pin shaft 33 and can rotate relative to the second large pin shaft 33, and the first rear link 41 and the second rear link 42 are located between two adjacent rear lugs 32, and are connected with the rear The end faces of the lugs 32 are in close contact with each other.

The rear end of the rear connecting rod 4 is hinged with the front end of the tailgate 1, that is, there is a second middle bracket 11 on the front end of the tailgate 1, and the third middle bracket 11 is fixed with the third largest pin 12, the third largest There is a groove on the two outer end surfaces of the pin shaft 12, correspondingly the two outermost end surfaces of the second intermediate bracket 11 are also provided with grooves, and a third clamping plate 9 is stuck on the third large pin shaft 12 and the second intermediate bracket 11 at the same time. In the groove, the third large pin 12 cannot rotate relative to the second intermediate bracket 11, and the rear end of the rear link 4 is movably sleeved on the third large pin 12 and can rotate relative to the third large pin 12 .

The push seat 6 is limited between the tail plate 1 and the movable template 2 by the guide rod 14 and can move back and forth. The push seat 6 is generally fixed with the piston rod of the mold unlocking cylinder, and the movement of the piston rod drives the push seat 6 between the tail plate 1 and the movable platen. Move back and forth between the movable template 2, which is the conventional structure of the general toggle link mold clamping mechanism.

One end of the small connecting rod 5 is hinged with one side of the push seat 6, and the small connecting rod 5 is composed of a first small connecting rod 51, a second small connecting rod 52 and a third small connecting rod 53 independent of each other, a first small pin 54, its two ends are fixed with one end of the first small connecting rod 51 and the third small connecting rod 53, and a groove is opened on the two outer end faces of the first small pin shaft 54, correspondingly the first small connecting rod 51 and the third small connecting rod There is also a groove on the outer end surface of one end of the rod 53, and a fourth clamping plate 10 is stuck in the grooves of the first small pin shaft 54, the first small connecting rod 51 and the third small connecting rod 53 at the same time, so that the first small pin The shaft 54 cannot rotate relative to the first small connecting rod 51 and the third small connecting rod 53; the second small connecting rod 52 is sleeved on the middle part of the first small pin shaft 54, and the middle part of the first rear connecting rod 41 is movably sleeved on the On the first small pin shaft 54 and can rotate relative to the first small pin shaft 54, and the first rear connecting rod 41 is located between the first small connecting rod 51 and the second small connecting rod 52 and the end faces are in close contact with each other. The middle part of the second rear connecting rod 42 is movably sleeved on the first small pin shaft 54 and can rotate relative to the first small pin shaft 54, and the second rear connecting rod 42 is located between the second small connecting rod 52 and the third small connecting rod. 53 and the end faces are in close contact with each other.

The other end of the small connecting rod 5 is hinged with the middle part of the rear connecting rod 4, that is, the two ends of the second small bearing pin 55 are fixed with the other ends of the first small connecting rod 51 and the third small connecting rod 53, and the second There is a groove on the two outer end faces of the small pin shaft 55, correspondingly the outer end faces of the other ends of the first small connecting rod 51 and the third small connecting rod 53 are also provided with grooves, and a fifth clamping plate 11 is stuck on the second In the grooves of the small pin 55, the first small connecting rod 51 and the third small connecting rod 53, the second small pin 55 can not rotate relative to the first small connecting rod 51 and the third small connecting rod 53; The other end of the second small connecting rod 52 is sleeved in the middle part of the second small pin shaft 55, and the two lugs 61 on one side of the push seat 6 are movably sleeved on the second small pin shaft 55 and can be moved relative to the second small pin shaft. Pin shaft 55 rotates.

The working process of the present invention is like this:

When clamping the mold, the clamping cylinder pushes the push seat 6 to move away from the tail plate 1, the small connecting rod 5 moves with the push seat 6, and at the same time the other end of the small connecting rod 5 pushes the upper end of the rear connecting rod 4 to expand outward, thereby driving The lower end of the front connecting rod 3 is stretched out to push the movable template 2 to move away from the tail plate 1, thereby completing the entire mold clamping action;

When the mold is opened, the clamping cylinder pulls the push seat 6 to move towards the tail plate 1, the small connecting rod 5 moves with the push seat 6, and at the same time, the other end of the small connecting rod 5 pulls the upper end of the rear connecting rod 4 to retract, thereby driving The lower end of the front connecting rod 3 is retracted, and the moving template 2 is pulled to move towards the direction close to the tail plate 1, thereby completing the whole mold opening action.

Claims (2)

1. A toggle link mold clamping mechanism, comprising an end plate (1), a movable platen (2) and a device arranged between the end plate (1) and the movable platen (2) to drive the movable platen to move relative to the end plate A pair of toggle link structures, each toggle link structure includes a front link (3), a rear link (4), a small link (5) and a push seat (6), wherein the front link (3 ) is hinged with the rear end face of the movable template (2), the rear end of the front connecting rod (3) is hinged with the front end of the rear connecting rod (4), and the rear end of the rear connecting rod (4) is connected with the tail plate (1) The front end face is hinged, one end of the small connecting rod (5) is hinged with the middle part of the rear connecting rod (4), and the other end is hinged with one side of the push seat (6), and the push seat (6) is limited by the guide rod (14) It is located between the tail plate (1) and the movable template (2) and can move back and forth. It is characterized in that: the front connecting rod (3) is an integral part, and the front end of the front connecting rod (3) has a connection with the movable template ( 2) Two front lugs (31) hinged on the rear end surface, and the rear end of the front connecting rod (3) has three rear lugs (32) hinged to the rear connecting rod (4); The rear end face of the movable template (2) has a first intermediate support (21), on which the first intermediate support (21) is fixed with a first large pin (22), and the first large pin (22) cannot be opposite to each other. The first intermediate bracket (21) rotates, and the two front lugs (31) of the front connecting rod (3) are movably sleeved on the first large pin shaft (22) and can be opposite to the first large pin shaft (22) turn; The three rear lugs (32) of the front connecting rod (3) are pierced and fixed with a second large pin (33), and the second large pin (33) cannot rotate relative to the front connecting rod (3). The front end of the rear connecting rod (4) is movably sleeved on the second large pin shaft (33) and can rotate relative to the second large pin shaft (33), and the rear connecting rod (4) is composed of the first rear A connecting rod (41) and a second rear connecting rod (42) are formed, the first rear connecting rod (41) and the second rear connecting rod (42) are located between two adjacent rear lugs (32), and Closely attached to the end face of the rear lug (32); The front end of the tail plate (1) has a second intermediate bracket (11), on which a third large pin (12) is fixed, and the third large pin (12) cannot be opposite to each other. The second intermediate bracket (11) rotates, and the rear end of the rear connecting rod (4) is movably sleeved on the third large pin (12) and can rotate relative to the third large pin (12); Described small connecting rod (5) is made up of the first small connecting rod (51), the second small connecting rod (52) and the 3rd small connecting rod (53) independent of each other, a first small pin shaft (54) its Two ends are fixed with an end of the first small connecting rod (51) and the 3rd small connecting rod (53), and this first small pin shaft (54) can not be relative to the first small connecting rod (51) and the 3rd small connecting rod ( 53) Rotate, the second small connecting rod (52) is sleeved in the middle part of the first small pin shaft (54), and the middle part of the first rear connecting rod (41) is movably sleeved in the first small pin shaft (54). on the pin shaft (54) and can rotate relative to the second small pin shaft (55), and the first rear connecting rod (41) is located between the first small connecting rod (51) and the second small connecting rod (52). Closely attached to each other, the middle part of the second rear connecting rod (42) is movably sleeved on the first small pin shaft (54) and can rotate relative to the first small pin shaft (54), and the second rear connecting rod ( 42) Located between the second small connecting rod (52) and the third small connecting rod (53) and the end faces are close to each other; Its two ends of a second small pin (55) are fixed with the other end of the first small connecting rod (51) and the third small connecting rod (53), and the second small pin (55) cannot be connected to the first small connecting rod. Rod (51) and the 3rd small connecting rod (53) rotate, and the other end of described second small connecting rod (52) is sleeved in the middle part of this second small bearing pin (55), pushes seat (6) The two lugs (61) on one side are movably sleeved on the second small pin shaft (55) and can rotate relative to the second small pin shaft (55). 2. The toggle link mold clamping mechanism according to claim 1, characterized in that: there is a groove on the two outer end surfaces of the first large pin (22), and correspondingly the two sides of the first middle bracket (21) There is also a groove on the outermost end surface, and a first clamping plate (7) is stuck in the groove of the first intermediate bracket (21) of the first large pin shaft (22) at the same time; There is a groove on the two outer end faces of the second large pin (33), correspondingly the two outermost end faces of the rear lug (32) are also grooved, and a second clamp (8) is stuck on the second In the groove of big pin shaft (33) and rear lug (32); There is a groove on the two outer end surfaces of the third large pin (12), and correspondingly the two outermost end surfaces of the second middle bracket (11) are also provided with grooves, and a third clamping plate (9) is stuck on the second In the groove of the three major bearing pins (12) and the second intermediate support (11); There is a groove on the two outer end surfaces of the first small pin shaft (51), correspondingly the outer end surfaces of one end of the first small connecting rod (51) and the third small connecting rod (53) are also provided with grooves. The four clamping plates (10) are simultaneously stuck in the grooves of the first small pin shaft (54), the first small connecting rod (51) and the third small connecting rod (53); There is a groove on the two outer end surfaces of the second small pin shaft (52), and correspondingly, grooves are also formed on the outer end surfaces of the other ends of the first small connecting rod (51) and the third small connecting rod (53). The fifth clamping plate (11) is stuck in the grooves of the second small pin shaft (55), the first small connecting rod (51) and the third small connecting rod (53) simultaneously.

Images