CN102962986A - Synchronous draw bar top opening mechanism - Google Patents

Abstract

The invention provides a synchronous draw bar top opening mechanism which comprises two hydraulic cylinders, wherein each of the hydraulic cylinder consists of a cylinder barrel, an upper end cover, a lower end cover, a piston and a piston rod. The synchronous draw bar top opening mechanism is characterized in that the end part of the piston rod is connected with a stretching hanging head through a left thread regulation sleeve and a right thread regulation sleeve; the stretching handing head is provided with a pin shaft for being hung and mounted below an auxiliary mold and a through hole I for regulating the gap; the lower end cover is provided with a through hole II hinged with a hinge shaft mounted on both sides of a blow-down mechanism; and an elastic centralizing block fixedly connected with the middle part of both sides of the blow-down mechanism is arranged on the outer wall of the cylinder barrel. The synchronous draw bar top opening mechanism provided by the invention has the beneficial effects of simultaneously performing synchronization and top-opening functions at the same time, being simple in structure, convenient in adjustment, uniform in stress and low in failure rate, and greatly reducing the cost for production, installation and debugging, and maintenance.

Description

Synchronous pull rod top mouth mechanism

technical field

The invention relates to a synchronous pull rod jacking mechanism, which is suitable for large and medium-sized plastic hollow blow molding machines for producing various types of hollow products with internal threaded joints on the end caps.

Background technique

When producing hollow products, due to structural or strength requirements, in addition to the main mold, a secondary mold is also required. When producing a hollow product with an internal thread interface on the end cap, during the clamping process of the secondary mold, it is required that the blowdown mechanism loaded with the air needle forming the internal thread must move synchronously with the secondary mold to ensure that the internal thread is not damaged, that is The so-called "synchronization".

In traditional hollow blow molding machines of this type, the synchronous movement of the auxiliary mold and the lower blowing mechanism is realized by four inverted L-shaped rigid hooks. Four rigid hooks are vertically installed on both sides of the down blowing mechanism, the installation height can be adjusted up and down, and fixed with screws after adjustment. When the main mold is pre-closed quickly, the two auxiliary molds move closer to the blow-down mechanism, and finally hook the blow-down mechanism. When the auxiliary mold is closed, four rigid hooks drive the down blowing mechanism to move synchronously with the auxiliary mold. Obviously, it is very difficult for this mechanism to make the four points of the four hooks hook two molds at the same time, and it is necessary to repeatedly disassemble the fixing screws to adjust the height of the four rigid hooks. Once the four hooks are in uneven contact, it will cause inflexibility in the movement of the secondary mold or the blowing mechanism. The stress situation of the hanging arms of the four hooks is uneven, and it is easy to be a cantilever beam state, which is very easy to break, especially when the four hooks are unevenly contacted with the secondary mold.

At the same time, for this type of hollow blow molding machine, the function of flattening the sealing surface of the threaded port ("top port") is completed by another set of top port mechanism. The mechanism is installed on the down blowing mechanism, driven by four hydraulic cylinders (two threaded ports on the end cover of the hollow product) or two hydraulic cylinders (one threaded port on the end cap) to drive two or one air needles and the down blowing mechanism A small relative movement is produced to squeeze the sealing surface of the flat threaded port. The arrangement of four hydraulic cylinders on the blow-down mechanism is crowded enough, and the eight oil pipes of the four hydraulic cylinders are criss-crossed, which makes the blow-down mechanism overwhelmed.

To sum up, the hollow blow molding machine realizes the synchronism between the auxiliary mold and the blowing mechanism and ensures the top opening action of the internal thread screw sealing surface is completed by two sets of mechanisms, which have complicated structures, fragile structures, and adjustments. Difficult, time-consuming, and high production costs.

Contents of the invention

The technical problem to be solved by the present invention is to provide a device that simultaneously completes the two functions of "synchronization" and "top opening", has simple structure, convenient adjustment, uniform force, low failure rate, and greatly reduces production, installation, commissioning and maintenance costs. Synchronous pull rod jacking mechanism.

Technical scheme of the present invention is:

A synchronous pull rod jacking mechanism, including two hydraulic cylinders, the hydraulic cylinder is composed of a cylinder barrel, upper and lower end caps, a piston and a piston rod. There is a stretching hanger, and the stretching hanger is provided with a through hole I for hooking the pin shaft installed under the sub-mold and adjusting the clearance. The through hole II hinged by the hinge shaft of the cylinder, and the outer wall of the cylinder is provided with elastic centering blocks for fixed connection with the middle parts on both sides of the blow down mechanism.

The elastic centering block is composed of a centering support, two spring seats respectively arranged in the centering support and abutting against the cylinder barrel symmetrically, a spring arranged in the spring seat, and a stepped rod-shaped adjustment. The adjusting screw is composed of a screw and a lock nut, the adjusting screw extends into the centering support and its small-diameter rod passes through the spring seat and fits the spring.

The through hole I is an oblong through hole for the convenience of hooking.

The beneficial effects of the present invention are:

1. The two hydraulic cylinders of this mechanism are connected to the pin shaft below the center of the auxiliary mold by the through hole Ⅰ on the stretching hanger, and the hinge shaft installed in the center of both sides of the down blowing mechanism by the through hole Ⅱ on the lower end cover. Hinged, so that the two hydraulic cylinders are placed vertically at the center of both sides of the blowing mechanism, and the verticality is adjusted by using the elastic centering block to ensure that when the main mold is quickly pre-closed, the pin shaft on the auxiliary mold is inserted into the center of the stretching hanger. through hole I of the header. The height of the two through holes I can be easily adjusted to be consistent with the left and right threaded adjustment sleeves, so as to ensure uniform force, low failure rate and prolong service life. The mechanism has the advantages of simple structure, convenient adjustment and easy operation.

2. After completing the connection between the sub-mold and the blowing mechanism so that the two move synchronously, the lower end cover of the hydraulic cylinder drives the blowing mechanism upward through the hinged shaft under the action of hydraulic oil, and realizes the top opening in the state of a two-force rod. action, the mechanism simultaneously completes the two functions of "synchronization" and "top opening", which greatly reduces the cost of production, installation, commissioning and maintenance.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a view from the direction A of Figure 1 (omitting the part of the blowing mechanism);

Fig. 3 is a partial enlarged view of I in Fig. 2 .

In the figure: secondary mold 1, pin shaft 2, stretching hanger 3, through hole Ⅰ301, left and right thread adjustment sleeve 4, nut 5, piston rod 6, gland 7, upper end cover 8, cylinder barrel 9, lower end cover 10 , Through hole II1001, elastic centering block 11, centering support 1101, spring seat 1102, spring 1103, adjusting screw 1104, lock nut 1105, hinge shaft 12, blowing down mechanism 13, piston 14.

Detailed ways

As shown in the figure, the synchronous pull rod jacking mechanism includes two hydraulic cylinders, each hydraulic cylinder consists of a cylinder barrel 9, an upper end cover 8 and a lower end cover 10 which are threadedly connected to the two ends of the cylinder barrel 9, and a hydraulic cylinder located in the cylinder barrel 9 The piston 14 and the piston rod 6 are composed, and the upper end cover 8 is provided with a gland 7 . The upper end of the piston rod 6 is connected with a stretching hanger 3 through the left and right threaded adjustment sleeves 4. The upper and lower ends of the left and right threaded adjustment sleeves 4 are locked by nuts 5 respectively. Connect to the through hole I301 of the pin shaft 2 installed under the secondary mold 1. The through hole I301 is an oblong or elongated through hole. This example takes the oblong through hole as an example. The lower end cover 10 is provided with a The through hole II 1001 hinged with the hinge shaft 12 installed on both sides of the down blowing mechanism 13, and the outer wall of the cylinder 9 is provided with an elastic centering block 11 for fixed connection with the middle of both sides of the down blowing mechanism 13. The elastic centering block 11 consists of a centering support 1101, two spring seats 1102 respectively arranged in the centering seat 1101 and symmetrically abutting against the cylinder 9, a spring 1103 arranged in the spring seat 1102, and a The stepped rod-shaped adjusting screw 1104 and the locking nut 1105 are composed. The adjusting screw 1104 extends into the centering support 1101 and its small-diameter rod passes through the spring seat 1102 and covers the spring 1103 .

When this mechanism is applied to a blow molding machine, the two hydraulic cylinders are hooked to the pin shaft 2 below the center of the secondary mold 1 through the through hole I301 on the stretching hanger 3, and the stretching can be adjusted through the left and right threaded adjustment sleeves 4. The hooking distance between the through hole I of the hanging head 3 and 301 and the pin shaft 2.

Utilize the through hole II1001 on the lower end cover 10 to hinge with the hinge shaft 12 installed at the center of both sides of the down blowing mechanism 13, so that the two hydraulic cylinders are placed vertically at the center of both sides of the down blowing mechanism 13, and use the elastic centering block 11 to adjust them Verticality. In order to realize the synchronous movement of the blowing mechanism 13 and the auxiliary mold 1, this mechanism plays the role of a synchronous pull rod; when it is necessary to carry out the step of leveling the surface of the threaded mouth, the rod cavity of the hydraulic cylinder is passed into the hydraulic oil, because the piston rod 6 and the piston 14 are hung on the pin shaft 2 below the secondary mold 1 through the stretching hanger 3 and cannot move, then under the action of the hydraulic oil, the hydraulic pressure pushes the upper end cover 7, the cylinder barrel 9, and the lower end cover 10 to move upward, and The down blowing mechanism 13 is pulled by the hinge shaft 12 to move upward until the lower end cover 10 hits the piston 14 to realize the "top opening" action of the blowing down mechanism 13 driving the air needle. The stroke of the top port is adjusted by the depth that the upper end cover 8 is screwed into the cylinder barrel 9 .

Claims (3)

1. A synchronous pull rod jacking mechanism, including two hydraulic cylinders, the hydraulic cylinder is composed of a cylinder barrel, upper and lower end caps, a piston and a piston rod, and it is characterized in that: the end of the piston rod is connected by a left and right threaded adjustment sleeve There is a stretching hanger, and the stretching hanger is provided with a through hole I for hooking the pin shaft installed under the sub-mold and adjusting the clearance. The through hole II hinged by the hinge shaft of the cylinder, and the outer wall of the cylinder is provided with elastic centering blocks for fixed connection with the middle parts on both sides of the blow down mechanism. 2. The synchronous pull rod jacking mechanism according to claim 1, characterized in that: the elastic centering block is composed of centering supports, which are respectively arranged in the centering supports and symmetrically abut against the cylinder. It is composed of two spring seats, a spring located in the spring seat, an adjustment screw in the shape of a stepped rod and a lock nut. The adjustment screw extends into the centering support and its small-diameter rod passes through the spring seat and fits the spring . 3. The synchronous tie rod jacking mechanism according to claim 1, characterized in that: said through hole I is an oblong through hole.

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