CN112078092A - Three-plate injection molding machine with pull rod capable of being automatically drawn out and reset - Google Patents

Abstract

A three-plate injection molding machine whose pull rod can be automatically pulled out and reset includes a fixed template, a rear template, a moving template, an upper and lower rod, a toggle link mechanism, a mold adjustment mechanism, a mold clamping cylinder, a brake cylinder assembly, and a pull rod cylinder assembly , The rear plate brake tightening cylinder assembly, the fixed formwork and the back formwork are connected by four upper and lower tie rods, the moving formwork is located between the fixed formwork and the back formwork, the movable formwork and the back formwork are connected by a toggle link mechanism, and the back formwork is connected. A mold clamping oil cylinder is set on the upper part, and the space for installing the mold is between the moving formwork and the fixed formwork; assembly, the rear template is provided with a pulling rod oil cylinder assembly. The invention can realize the precise extraction of the tie rod, facilitate the installation of the mold, and has high repeatability after reset, without affecting the original elastic bearing force of the tie rod.

Description

A three-plate injection molding machine with automatic pull-out and reset of tie rods

1. Technical field

The invention relates to a plastic injection molding machine, in particular to a three-plate injection molding machine in which a pull rod of a toggle link mechanism can be automatically pulled out and reset.

2. Background technology

The four tie rods of the existing three-plate injection molding machine of the toggle linkage mechanism are fixed relative to the fixed template, so when the mold is installed and replaced, the mold needs to be lifted by a lifting device, and it must be higher than the upper part. The tie rod can lift the mold from the top of the machine, and then fix it on the fixed template and mobile template, as shown in Figure 1. The mold installation of this three-platen injection molding machine has higher requirements for the height of the workshop and lifting equipment, especially for large three-platen injection molding machines, the mold installation is more difficult.

The plastic injection molding machine equipment mold is usually lifted above the upper edge of the upper tie rod by driving, and the mold is hoisted into the injection molding machine. Due to the high height of the large injection molding equipment itself, it has high requirements for the height of the workshop and driving. , the cost of investment is particularly large.

In the patent (patent number: CN200810163368.4), a large injection molding machine is mentioned, which includes a fixed template, a movable template, a tie rod, and a mold adjustment template. A mold adjustment nut is set on one side of the mold adjustment template, and a brake mechanism is set on the fixed template. The die-adjusting butterfly and female are divided into two parts: the main body of the die-adjusting nut and the die-adjusting screw female gear, which are connected by a key, and a die-adjusting nut pressing mechanism is also set between the two to prevent the die-adjusting nut from being on the pull-out rod. rotate. When the die-adjusting nut is pulled out with the pull-out tie rod, the pressing block in the pressing device on it is pressed against the tie-rod under the action of the spring. Although this can prevent the die-adjusting nut from rotating, it also affects the original tension of the tie-rod. Elastic bearing force, thus affecting the life of the tie rod.

3. Solutions for technological inventions

The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a three-plate injection molding machine with a pull-out rod, which can solve the problem of difficulty in mold installation especially for large-scale three-plate injection molding machines in lower workshops , the mold can be hoisted into the machine at a low height level, and does not affect the original elastic bearing force of the tie rod.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a three-plate injection molding machine in which the pull rod can be automatically pulled out and reset, including a fixed template, a rear template, a movable template, an upper and lower rod, a toggle link mechanism, a mold adjustment Mechanism, clamping cylinder, holding brake cylinder assembly, pulling rod cylinder assembly, rear plate brake tightening cylinder assembly, the fixed formwork and the rear formwork are connected by four upper and lower tie rods, and the moving formwork is located between the fixed formwork and the rear formwork, The movable template and the rear template are connected by a toggle link mechanism, and a clamping cylinder is set on the rear template, which acts on the toggle link mechanism to push the movable template to reciprocate to achieve mold closing and mold opening. The mold space is installed. The upper and lower rods are provided with a mold adjustment mechanism at the extension end of the rear template to adjust the thickness of the installation mold. The upper and lower rods are fixed at the extension end of the fixed template with nuts. The upper pull rod is an extractable pull rod. A holding brake cylinder assembly is arranged on the fixed template, a rear plate brake tightening cylinder assembly is arranged in the mould adjusting mechanism, and a pulling rod cylinder assembly is arranged on the rear template.

Preferably, the holding brake cylinder assembly is composed of an oil cylinder I, a half nut, a piston rod, a connecting rod mechanism, a guide pressure plate, a cover plate, and a proximity switch I. The oil cylinder I is fixed on the holding brake half nut, and the piston rod. The extension end I is connected to the other half of the half nut, and the link mechanism is fixed on the fixed template. The half nut is synchronously tightened and loosened by the link mechanism fixed on the fixed template. The half nut is fixed with guide pressure plates up and down. On the fixed formwork, the tightening and loosening of the half nut can be achieved more smoothly, synchronously and accurately. A cover plate is installed on the guide platen, and a proximity switch I is installed on the cover plate and the upper guide platen to control the movement and reset of the upper pull rod and the half nut.

Preferably, the rear plate brake tightening oil cylinder assembly is composed of an oil cylinder II, a rear nut pressing plate, a piston rod extending end II, a gate plate, a rear nut, and a proximity switch II. The oil cylinder II is fixed on the rear nut pressing plate, and the rear nut is The pressure plate is fixed on the rear formwork, the extension end II of the piston rod is connected to the gate, and the reciprocating motion of the gate acts on the rear nut to open and close the reciprocating motion of the upper pull rod and the rear nut, and the rear nut pressing plate is provided with a proximity switch II to control the gate The board is turned on and reset.

Preferably, the pulling rod oil cylinder assembly is composed of an oil cylinder III, a base plate, an extension end III of the piston rod, and a connecting plate. The oil cylinder III is fixed on the base plate, the base plate is fixed on the rear template, and the extension end III of the piston rod is fixed at the bottom plate. On the connecting plate, the connecting plate is fixed on the upper tie rod at the extension end of the rear template, so that the oil cylinder III drives the upper tie rod to reciprocate, so as to realize the extraction and reset of the upper tie rod.

Compared with the prior art, the advantages of the present invention are: because the injection molding machine is provided with an automatic pull-out device for pull-rods, the upper pull-rod can be pulled out automatically, so when the mold needs to be replaced or installed, the upper pull-rod can be pulled out first without the Obstructing the entry and exit of the mold, only the lower tie rod blocks the movable template and the fixed template, so that the mold can be easily hoisted into the template room to install the mold. After the mold is installed, the tie rod is inserted into the fixed template to reset, so it can reduce the impact on the workshop. In accordance with the requirements of hoisting equipment, it is very convenient to replace the mold, save costs, and better suit the installation environment. At the same time, the upper tie rod and the rear nut only perform linear motion without rotational movement during the reciprocating movement and extraction process, and the rear nut is close to the rear template during reset. , and the nut restricts its movement after the gate is closed. The Huff nut can be synchronously and precisely tightened and the pull rod can be pulled out. Therefore, after reset, the repeatability is high, and the original elastic bearing force of the pull rod is not affected.

4. Description of drawings

Fig. 1 is the schematic diagram of existing injection molding machine mold installation;

2 is a schematic diagram of the mold installation of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

3 is a schematic diagram of the general assembly structure of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

FIG. 4 is a schematic diagram of a brake cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

Figure 5 is a left cross-sectional view of the brake cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

6 is a right cross-sectional view of the brake cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

7 is a schematic structural diagram of a rear plate brake tightening cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

8 is a cross-sectional view of the structure of the rear plate brake tightening cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically pulled out and reset according to the present invention;

9 is a cross-sectional view of a pull rod cylinder assembly of a three-plate injection molding machine with a pull rod that can be automatically withdrawn and reset according to the present invention;

In the picture: 1-Fixed template, 2-Rear template, 3-Moving template, 4-Tie rod, 5-Toggle link mechanism, 6-Module adjustment mechanism, 7-Clamping cylinder, 8-Cylinder I, 9-Ha Husband nut, 10-piston rod extension end I, 11-connecting rod mechanism, 12-guide platen, 13-cover plate, 14-proximity switch I, 15-oil cylinder II, 16-rear nut pressure plate, 17-piston rod extension Outlet II, 18-gate, 19-rear nut, 20-proximity switch II, 21-oil cylinder III, 22-base plate, 23-piston rod extension III, 24-connecting plate.

5. Specific implementation

The technical solutions of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following examples, and any modifications and/or changes made to the present invention will fall within the protection scope of the present invention.

Example 1:

As shown in Figure (3), a three-platen injection molding machine with automatic pull-out and reset of the pull rod includes a fixed template 1, a rear template 2, a movable template 3, an up-down rod 4, a toggle link mechanism 5, and a mold-adjusting mechanism 6 , Clamping cylinder 7 , holding brake cylinder assembly 25 , pulling rod cylinder assembly 26 , rear plate brake tightening cylinder assembly 27 .

The fixed formwork 1 and the back formwork 2 are connected by four upper and lower tie rods 4, the movable formwork 3 is between the fixed formwork 1 and the back formwork 2, and the movable formwork 3 and the back formwork 2 are connected by a toggle link mechanism. 5 is connected, a clamping oil cylinder 7 is set on the rear template 2, which acts on the toggle link mechanism to push the moving template 3 to reciprocate to achieve mold closing and opening. A mold adjusting mechanism 6 is arranged at the extension end of the rear template 2 to adjust the thickness of the installation mold. The upper and lower rods 4 are fixed with nuts at the extension end of the fixed template 1. The upper pull rod 4 is an extractable pull rod, and the fixed template 1 A holding brake oil cylinder assembly 25 is arranged on the top, a rear plate brake tightening oil cylinder assembly 27 is arranged in the mold adjusting mechanism 6 , and a pulling rod oil cylinder assembly 26 is arranged on the rear template 2 .

As shown in Figures (4), (5), and (6), the brake cylinder assembly consists of oil cylinder I8, half nut 9, piston rod extension I10, connecting rod mechanism 11, guide pressure plate 12, cover plate 13. Proximity switch I14 is composed, the oil cylinder I8 is fixed on the brake half nut 9, the extension end I10 of the piston rod is connected to the other half of the half half nut 9, and the connecting rod mechanism 11 is fixed on the fixed template 1. The connecting rod mechanism 11 on the top realizes the synchronous tightening and loosening of the Huff nut 9, and the upper and lower guide plates 12 are arranged on the Huff nut 9 to be fixed on the fixed template 1, so that the Huff nut 9 can be held more smoothly, synchronously and accurately. Tighten and loosen. A cover plate 13 is installed on the guide platen 12 , and a proximity switch I14 is installed on the cover plate 13 and the upper guide platen 12 to control the movement and reset of the upper pull rod 4 and the half nut 9 .

As shown in Figures (7) and (8), the rear plate brake cylinder assembly is composed of oil cylinder II15, rear nut pressing plate 16, piston rod extension II17, gate 18, rear nut 19, and proximity switch II20. II15 is fixed on the rear nut pressing plate 16, the rear nut pressing plate 16 is fixed on the rear template 2, the extending end of the piston rod II17 is connected to the gate 18, and the reciprocating motion of the gate 18 acts on the rear nut 19 to open and close the upper pull rod 4. And the reciprocating movement of the rear nut 19. The rear nut pressing plate 16 is provided with a proximity switch II 20 to control the opening and reset of the gate 18 .

As shown in Figure (9), the pulling rod cylinder assembly consists of cylinder III21, base plate 22, piston rod extension III23, and connecting plate 24. The cylinder III21 is fixed on the base plate 22, the base plate 22 is fixed on the rear template 2, and the piston The extension end III23 of the rod is fixed on the connecting plate 24, and the connecting plate 24 is fixed to the extension end of the upper pull rod 4 at the rear template, so that the oil cylinder III21 drives the upper pull rod 4 to reciprocate to realize the extraction and reset of the upper pull rod 4.

In order to facilitate the installation of the mold, first pull out the upper pull rod on one side of the three-plate injection molding machine with the pull rod pull-out function. The process is as follows:

The clamping cylinder 7 acts on the toggle link mechanism 5 to move the movable template 3 away from the fixed template 1 to complete the mold opening action, and then the brake cylinder I8 works to drive the link mechanism 11 to loosen the Huff nut 9. The position is set by Proximity switch I14 senses, at this time the pull-out rod 4 is in a free state at the extended end of the fixed template 1; then the rear plate brake tightening cylinder II15 works, driving the gate 18 to move backward, and the position is sensed by the proximity switch II20, and the pull-rod can be pulled out at this time 4 and the rear nut 19 are in a movable state; finally, the pulling rod cylinder III21 works, and the connecting plate 24 drives the withdrawable pulling rod 4 and the rear nut 19 to move away from the fixed template 1 together until the withdrawable pulling rod 4 does not block the fixed template 1 and the moving template. 3 to the lateral space for mold installation, at this time, only the lower tie rod 4 is blocked on one side of the main body of the injection molding machine, so that the mold installation or replacement can be easily performed laterally, and the mold can be conveniently placed at a lower height. Hang it horizontally between the fixed formwork 1 and the mobile formwork 3, as shown in Figure (2).

After the mold is installed, the pull-out rod is automatically reset. The process is as follows:

The pulling rod oil cylinder III21 works, and the pull-out rod 4 and the rear nut 19 are driven by the connecting plate 24 to move together and pass through the fixed template 1 until the rear nut 19 is in close contact with the rear template 2. The position is sensed by the proximity switch I14, and then the rear gate is tightened. The oil cylinder II15 works, drives the gate 18 to move forward, and the position is sensed by the proximity switch II20, and then the brake cylinder I8 works, driving the link mechanism 11, so that the half nut 9 is tightened and the pull rod 4 can be pulled out, and the position is sensed by the proximity switch I14 , and finally the clamping cylinder 7 acts on the toggle link mechanism 5 to move the moving template 3 to the fixed template 1, completing the clamping action and fixing the mold.

Example 2: The pull-up rod on the non-operation side can also be pulled out in the same way.

The above-mentioned embodiment is only a preferred solution of the present invention, and does not limit the present invention in any form, and there are other variations and modifications under the premise of not exceeding the technical solution recorded in the claims.

Claims (5)

1. The utility model provides a three board-like injection molding machines that pull rod can be taken out automatically and reset, includes fixed die plate, back template, movable mould board, upper and lower pull rod, toggle link mechanism, mould adjusting mechanism, mode locking hydro-cylinder, band-type brake hydro-cylinder subassembly, pull rod hydro-cylinder subassembly, the tight hydro-cylinder subassembly of back plate brake, its characterized in that: the fixed template is connected with the rear template by an upper pull rod and a lower pull rod; the movable template is positioned between the fixed template and the rear template, and the movable template is connected with the rear template through a toggle link mechanism; a mold locking oil cylinder is arranged on the rear template, and a mold mounting space is formed between the movable template and the fixed template; the extending ends of the upper and lower pull rods on the rear template are provided with a template adjusting mechanism; the upper pull rod and the lower pull rod are fixed at the extending end of the fixed template by nuts; the upper pull rod is a telescopic pull rod, the fixed template is provided with a band-type brake cylinder assembly, the mold adjusting mechanism is internally provided with a rear plate brake tight cylinder assembly, and the rear template is provided with a drawing rod cylinder assembly.

2. The three-plate injection molding machine with the automatically extractable and resettable tie bar of claim 1, wherein: band-type brake cylinder subassembly include hydro-cylinder I, half nut, the piston rod, link mechanism, the direction clamp plate, the apron, proximity switch I, on hydro-cylinder I was fixed in band-type brake half nut, the piston rod stretches out end I and connects second half nut, link mechanism is fixed in on the fixed die plate, realize that half nut is held tightly in step, loosen the action, install the apron on the direction clamp plate, set up proximity switch I on apron and last direction clamp plate, the removal of control pull rod and half nut resets.

3. The three-plate injection molding machine with the automatically extractable and resettable tie bar of claim 2, wherein: the half nut is vertically provided with the guide pressing plates and fixed on the fixed template, so that the half nut can be stably, synchronously and accurately held and loosened.

4. The three-plate injection molding machine with the automatically extractable and resettable tie bar of claim 1, wherein: the rear plate brake tightening oil cylinder assembly comprises an oil cylinder II, a rear nut pressing plate, a piston rod extending end II, a flashboard, a rear nut and a proximity switch II, wherein the oil cylinder II is fixed on the rear nut pressing plate, the rear nut pressing plate is fixed on a rear template, the piston rod extending end II is connected with the flashboard, the flashboard reciprocates on the rear nut to open and close the upper pull rod and the rear nut, and the rear nut pressing plate is provided with the proximity switch II to control the flashboard to open and reset.

5. The three-plate injection molding machine with the automatically extractable and resettable tie bar of claim 1, wherein: the drawing rod oil cylinder assembly comprises an oil cylinder III, a bottom plate, a piston rod extending end III and a connecting plate, wherein the oil cylinder III is fixed on the bottom plate, the bottom plate is fixed on the rear template, the piston rod extending end III is fixed on the connecting plate, the connecting plate is fixed on the upper pull rod extending end of the rear template, the oil cylinder III drives the upper pull rod to reciprocate, and the upper pull rod is drawn out and reset.

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