CN1253298C - Clamping device for injection molding machine - Google Patents

Abstract

A mould locking device for injection moulding machine is characterized by that a toggle connecting-rod group is pivoted between bearing disk and movable mould seat, the bearing disk and movable mould seat are combined on a tie-rod, and a linking seat is movably cover-mounted on the tie-rod between bearing disk and movable mould seat, and is movably pivoted with third toggle arm of toggle connecting-rod group, and a driving mechanism is combined on the linking seat, and the power source of said driving mechanism can be used for driving screw sleeve in the linking seat to rotate, and the interior of screw sleeve is screw-connected with ball screw, and the front end of ball screw is fixedly connected with back side of movable mould seat. When the power source drives the screw sleeve to rotate, the screw sleeve can move on the ball screw to drive the linkage seat to move, further drive the toggle connecting rod group to push the movable mold seat to move, and perform the locking and mold opening strokes, so that the transmission mechanism driving the shaft joint connecting rod group and the movable mold seat to act is arranged on the machine body, and the purposes of saving the assembly space and the packaging and transportation cost are achieved.

Description

Clamping device for injection molding machine

technical field

The present invention relates to a mold clamping device for an injection molding machine, in particular to a mold clamping device that can drive a toggle link group to move a movable mold seat through a transmission mechanism combined in the machine body, so as to save installation purpose of space.

Background technique

Refer to Figure 6. Looking at the mold clamping and mold opening actions of general injection molding machines, most of them are carried out by the mold clamping device, and the common toggle injection molding machine is shown in Figure 6, which is based on its toggle linkage. Group 10 cooperates with the hydraulic cylinder 20 protruding out of the body to push the movable mold base 30 to move and move, and to perform the stroke of opening and locking the mold. Its main defects are:

In the common toggle-type injection molding machine mentioned above, since the hydraulic cylinder 20 has to protrude a long distance outside the body, a large volume space must be used during packing and transportation, which increases the cost of packaging and transportation; At the same time, when installing the injection molding machine, the hydraulic cylinder will occupy part of the available area in the factory building, which will cause great troubles in the site planning in the factory building and the configuration of the injection molding machine.

Referring to Fig. 7-Fig. 9, in order to improve the disadvantages of the above-mentioned traditional toggle injection molding machine in use. The industry has developed an Italian patent case, its application number is 92830069.8 (announcement number is 0511170A2), the main result is that its toggle link group 2 is combined between the movable mold base 5 and the bearing plate 1, the toggle joint The first toggle arm 21 of the link group 2 is pivotally connected to the inner wall of the bearing plate 1, and is pivotally connected to the second toggle arm 22, and the two ends of the second toggle arm 22 are connected to the first toggle arm 21 and the connecting arm respectively. 24 is pivotally connected, and after the upper two ends of the second elbow arm 22 are respectively pivotally connected with the first elbow arm 21 and the link arm 24, an appropriate place on the second elbow arm 22 can be used for connecting with one end of the third elbow arm 23. pivotally connected, and the other end of the third elbow arm 23 is pivotally connected with the linkage 3, so that the two hydraulic cylinders 4 are fixedly connected to both sides of the linkage 3 respectively, as shown in Figure 9, and The movable end of the output shaft 41 of the hydraulic cylinder 4 can be fixedly connected to the movable mold base 5; when the mold clamping action is performed, in addition to still firmly locking the mold, it is also possible to push the toggle link group 2 The hydraulic cylinder 4 does not need to extend out of the machine body, thereby saving packaging and transportation costs and reducing installation space. Its main flaws are:

However, in the actual production and use of the above-mentioned invention patents, although the predetermined purpose and effect can be successfully achieved, because the hydraulic cylinders for pushing the movable mold base are arranged on both sides of the moving base, two oil cylinders are required. Only by pressing the cylinder can the toggle link group and the movable mold base be driven smoothly, so that the manufacturing cost cannot be reduced.

Contents of the invention

The main purpose of the present invention is to provide a mold clamping device for an injection molding machine. The injection molding machine is mainly provided with a connecting toggle connecting rod set pivotally between the bearing plate and the movable mold base. The bearing plate and the movable mold base are combined. On the tie rod, and on the tie rod between the bearing plate and the movable mold seat, a linkage seat is movably fitted, and the linkage seat is movably pivotally connected with the third elbow arm of the toggle linkage group. A transmission mechanism is combined on the movable seat. The power source of the transmission mechanism can drive the screw sleeve in the linkage seat to rotate, and a ball screw is screwed inside the screw sleeve. The front end of the ball screw is fixedly connected to the back of the movable mold base. side; when the power source drives the screw sleeve to rotate, the screw sleeve can be moved on the ball screw to drive the moving seat to move, and then drive the toggle connecting rod group to move the movable mold seat to perform the locking and mold opening strokes , so that the transmission mechanism that drives the joint connecting rod group and the movable mold base is installed in the body, so as to save assembly space and packaging and transportation costs.

Another object of the present invention is to provide a mold clamping device for an injection molding machine. The transmission mechanism that drives the toggle link group and the movable mold base is an oil pressure cylinder combined at the center of the linkage base. The movable end of the output shaft of the pressure cylinder is fixedly connected to the back side of the movable mold base, so that when the hydraulic cylinder is in motion, the toggle link group and the movable mold base are linked to lock and open the mold, so that the oil The cylinder is combined in the body to save assembly space and packaging and transportation costs.

The object of the present invention is achieved in the following way: a mold clamping device for an injection molding machine, a toggle link set is pivotally connected between the bearing plate and the movable mold base of the injection molding machine, and There is a linkage seat on the tie rod in between. The first toggle arm of the toggle link group is pivotally connected to the inner wall of the bearing plate, and is pivotally connected to the second toggle arm. The two ends of the second toggle arm are It is pivotally connected with the first elbow arm and the connecting arm respectively, and is pivotally connected with one end of the third elbow arm on the second elbow arm, and the other end of the third elbow arm is pivotally connected with the linkage seat, and is characterized in that : The linkage seat is combined with a transmission mechanism, which is composed of a power source and a ball screw; the power source drives the screw sleeve combined in the center of the linkage seat to rotate through the connecting element, and the ball screw is screwed. In the screw sleeve of the linkage seat, the front end of the ball screw is fixedly connected to the back side of the movable mold base; the center of the bearing plate is provided with a middle hole for the ball screw to extend into; the power source drives the screw sleeve to rotate , the screw sleeve moves on the ball screw, driving the linkage seat to move, and then driving the toggle link group to push the movable mold seat to move, and to carry out the stroke of pinning and mold opening.

The transmission mechanism that drives the action of the toggle connecting rod group and the movable mold base is a hydraulic cylinder combined at the center of the linkage base. The movable end of the output shaft of the hydraulic cylinder is fixedly connected to the movable mold base. On the back side, the output shaft of the hydraulic cylinder protrudes forward, and the linked toggle connecting rod group and the movable mold base move to perform the stroke of mold clamping; the output shaft of the hydraulic cylinder retracts to perform the stroke of mold opening .

Further description will be given below in conjunction with preferred embodiments and accompanying drawings.

Description of drawings

Fig. 1 is a schematic top view of the present invention.

Fig. 2 is a schematic front view of the present invention [when the mold is locked].

Fig. 3 is a schematic diagram of the action state of the present invention (when the mold is opened).

Fig. 4 is a schematic front view of Embodiment 2 of the present invention [when the mold is locked].

Fig. 5 is a schematic diagram of the operating state of Embodiment 2 of the present invention (when the mold is opened).

Fig. 6 is a schematic diagram of a conventional toggle injection molding machine.

Fig. 7 is a schematic front view of another conventional toggle injection molding machine.

Fig. 8 is a second schematic front view of another conventional toggle-type injection molding machine.

Fig. 9 is a schematic side view of another conventional toggle injection molding machine.

Detailed ways

Example 1

Referring to Fig. 1-Fig. 3, the support plate 1 and the movable mold base 5 of the injection molding machine of the present invention are pivotally connected with the toggle link group 2, and the system between the support plate 1 and the movable mold base 5 There is a movable seat 3 on the rod 40, and the first toggle arm 21 of the toggle link group 2 is pivotally connected to the inner wall of the bearing plate 1, and is pivotally connected to the second toggle arm 22, and the second toggle arm 22, the upper two ends are pivotally connected with the first elbow arm 21 and the connecting arm 24 respectively, and after the two upper ends of the second elbow arm 22 are respectively pivotally connected with the first elbow arm 21 and the connecting arm 24, the second elbow arm 22 The upper supply is pivotally connected to one end of the third elbow arm 23, and at the same time, the other end of the third elbow arm 23 is pivotally connected to the linkage seat 3. The main improvements are as follows:

The linkage 3 is combined with a transmission mechanism 7, and the transmission mechanism 7 is composed of a power source 71 and a ball screw 72; the power source 71 can drive the screw sleeve 32 combined in the center of the linkage 3 through the connecting element 711 Rotate, and the ball screw 72 is screwed in the screw sleeve 32 of the linkage seat 3, and the front end of the ball screw 72 is fixedly connected to the joint 51 on the back side of the movable mold base 5, and is connected and fixed with the movable mold base 5 connection; in addition, a middle hole 11 is provided in the center of the bearing plate 1 for the ball screw 71 to extend into.

When the present invention is in operation and stretches out to lock the mold, the power source 71 of the transmission machine 7 can drive the screw sleeve 32 to rotate, so that the screw sleeve 32 is screwed on the ball screw 72, and then drives the moving seat 3 to move forward. , and link the movable mold base 5 to advance along the tie rod 40. At this time, the movable mold base 5 is also connected to drive the connecting arm 24 to make the second elbow arm 22 stretch out and stretch out forward, while the second elbow arm 22 and then drive the third toggle arm 23 to move inwardly. At the same time, through the passing of the third toggle arm 23, the linkage seat 3 also continues to move forward. When approaching the end of the clamping stroke, the toggle link group 2 The magnification ratio of the output of the power source 71 is amplified to the maximum to generate a huge mold clamping force to lock the mold [as shown in FIG. 2 ].

On the contrary, when the action is implemented and the mold is to be opened, the power source 71 of the transmission mechanism 7 can be reversed, and the screw sleeve 32 of the linkage seat 3 can retreat on the ball screw 72, and then drive the rotatable mold base 5 along the system. The rod 40 retreats, and the movable mold base 5 also drives the connecting arm 24, so that the second elbow arm 22 moves backward, and the second elbow arm 22 also drives the third elbow arm 23 to move backward, and makes the linkage seat 3 move backward. , and the first toggle arm 21 also moves backward, and when the toggle link group 2 returns to the bottom dead point, it drives the movable mold base 5 back to the position, and completes the mold opening stroke (as shown in Figure 3) .

Example 2

Referring to Fig. 4-Fig. 5, the transmission mechanism that drives the toggle link group 2 and the movable mold base 5 in the second embodiment of the present invention is a hydraulic cylinder 73 combined at the center of the linkage base 3. The movable end of the output shaft 731 of the hydraulic cylinder 73 is fixedly connected to the back side of the movable mold base 5, and when the output shaft 731 of the hydraulic cylinder 73 stretches forward, the toggle link group 2 and the movable The mold base 5 moves and performs the mold locking stroke; and when the output shaft 731 of the hydraulic cylinder 73 retracts, the mold opening stroke (as shown in Figure 5 ) is carried out.

It can be known from the above component composition and action implementation description that in the present invention, in addition to installing the transmission mechanism for driving the toggle link group and the movable mold base on the linkage base in the machine body, the mold opening and locking can be performed. In addition to the stroke, the transmission mechanism of the present invention is only a set of power sources. Cooperating with the screw sleeve and the ball screw, it can also drive the toggle mechanism and the movable mold base to lock and open the mold, so it has the advantages of saving assembly space and packaging and transportation costs. Features; at the same time, only a single hydraulic cylinder can be used to drive the toggle mechanism and the movable mold base to lock and open the mold, so it has the advantages of simplifying components and reducing manufacturing costs, so it is very industrially applicable sex.

Claims (2)

1. A mold clamping device for an injection molding machine. A toggle connecting rod group [2] is pivotally connected between the support plate [1] and the movable mold base [5] of the injection molding machine, and the support plate [1] The upper tie rod [40] between the movable mold base [5] is equipped with a linkage seat [3], and the first toggle arm [21] of the toggle link group [2] is pivotally connected to the bearing. On the inner wall of the disc [1], and pivotally connect the second elbow arm [22], the two ends of the second elbow arm [22] are respectively pivotally connected with the first elbow arm [21] and the connecting arm [24] , on the second elbow arm [22], it is pivotally connected with one end of the third elbow arm [23], and the other end of the third elbow arm [23] is pivotally connected with the linkage seat [3]. It is characterized in that : The linkage seat [3] is combined with a transmission mechanism [7], the transmission mechanism [7] is composed of a power source [71] and a ball screw [72]; the power source [71] is connected through the connecting element [711 ] drives the screw sleeve [32] combined in the center of the linkage seat [3] to rotate, the ball screw [72] is screwed in the screw sleeve [32] of the linkage base [3], the ball screw [72 ]’s front end is fixedly connected on the back side of the movable mold base [5]; the center of the support plate [1] is provided with a middle hole [11] for the ball screw [72] to extend into; the power source [71] Drive the screw sleeve [32] to rotate, the screw sleeve [32] moves on the ball screw [72], drives the displacement of the linkage seat [3], and then drives the toggle connecting rod group [2] to push the movable mold base [5] Displacement, the stroke of pin and mold opening. 2. The mold clamping device of an injection molding machine according to claim 1, characterized in that: the transmission mechanism that drives the toggle link group and the movable mold base is an oil pressure combined at the center of the linkage base. Cylinder, the movable end of the output shaft of the hydraulic cylinder is fixedly connected to the back side of the movable mold base, the output shaft of the hydraulic cylinder protrudes forward, and the linkage toggle connecting rod group and the movable mold base move , and carry out the mold clamping stroke; the output shaft of the hydraulic cylinder is retracted, and the mold opening stroke is carried out.

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